阅读说明：本技术 一种多功能脱扣器 (Multifunctional release ) 是由 葛纹懿 周超 于 2021-06-18 设计创作，主要内容包括：本发明公开了一种多功能脱扣器,包括用于双向抑制来自电网和内部电路产生的干扰信号的EMC滤波电路、将交流电压转变为脉动直流电压的整流电路、储能电路、能量电路、电源电路、采样电路、MCU电路、驱动电路、模式与延时设置电路、欠压电磁铁、闭合电磁铁和触点输出,既可是独立的欠电压瞬时/延时欠压脱扣器,又可以是零电压瞬时/延时欠压脱扣器,且通过联控闭合电磁铁,为无人值守场合自动恢复电力供应,提供了极大便利,触点输出更进一步地扩展了本脱扣器的潜在功能。(The invention discloses a multifunctional release, which comprises an EMC filter circuit for bidirectionally inhibiting interference signals generated by a power grid and an internal circuit, a rectifying circuit for converting alternating current voltage into pulsating direct current voltage, an energy storage circuit, an energy circuit, a power supply circuit, a sampling circuit, an MCU circuit, a driving circuit, a mode and delay setting circuit, an undervoltage electromagnet, a closing electromagnet and contact output.)

1. A multifunctional release is characterized in that: the electromagnetic energy meter comprises an EMC filter circuit, a rectifier circuit, an energy storage circuit, an energy circuit, a power supply circuit, a sampling circuit, an MCU circuit, a driving circuit, a mode and delay setting circuit, an undervoltage electromagnet, a closed electromagnet and an output contact, wherein the EMC filter circuit is connected with the rectifier circuit, the rectifier circuit is connected with the energy storage circuit and the energy circuit, the energy circuit is connected with the electric MCU circuit and the magnet, the sampling circuit is connected with the rectifier circuit and the energy storage circuit, the MCU circuit is connected with the sampling circuit, the mode and delay setting circuit, the driving circuit and the energy circuit, the driving circuit is connected with the undervoltage electromagnet, the closed electromagnet and the contact output circuit, the undervoltage electromagnet is connected with the driving circuit and the energy circuit, the closed electromagnet is connected with the driving circuit and the energy storage circuit, and the contact output is connected with the energy storage circuit and the driving circuit, the power supply circuit provides working power supply for the MCU circuit, the energy storage circuit and the driving circuit.

2. A multi-function trip unit according to claim 1, wherein: the EMC filter circuit is used for bidirectionally suppressing interference signals generated by a power grid and an internal circuit, and the rectifying circuit converts alternating-current voltage into pulsating direct-current voltage.

3. A multi-function trip unit according to claim 1 or 2, wherein: setting a working mode through a corresponding dialing bit in the mode and delay setting circuit, and setting a corresponding one-bit or digital dialing combination to determine delay time; under the control of the MCU circuit, an energy storage capacitor in the energy storage circuit is charged and discharged in an 'activation' mode, and the energy circuit supplies power to the undervoltage electromagnet; in the zero-voltage mode, after the voltage of the power grid is in voltage loss, the energy in the energy storage capacitor continuously supplies power to the undervoltage electromagnet until the time value defined by the dial.

4. A multi-function trip unit according to claim 1 or 2, wherein: the EMC filter circuit is a simple piezoresistor, a pi-type filter circuit such as LC (inductance-capacitance) or a complex filter formed by combining a series mode and a common mode component; the rectifier circuit is a full bridge circuit, or "full bridge" module, of a combination of discrete components.

5. A multi-function trip unit according to claim 1 or 2, wherein: the energy storage circuit is controlled by the MCU circuit, energy storage elements such as an energy storage capacitor or a storage battery are charged and discharged in an activated mode, when the charging voltage is higher than a set value, the charging is stopped, when the energy storage voltage is lower than the set value, the charging is started, the charging time is always synchronous with the zero crossing point of a power grid, and the charging time is integral multiple of the half period of the power grid so as to reduce the surge current to the maximum extent.

6. A multi-function trip unit according to claim 1 or 2, wherein: the energy circuit is controlled by the MCU circuit, the rectification pulsating voltage and the energy storage voltage which represent the input voltage of the power grid are judged to be high or low, when the pulsating voltage is higher than 0.3Ue, the pulsating voltage supplies power to the undervoltage electromagnet, when the pulsating voltage is lower than 0.3Ue and is not zero voltage, the pulsating voltage and the energy storage voltage jointly supply power to the undervoltage electromagnet, and when the pulsating voltage is zero, the energy storage voltage supplies power to the undervoltage electromagnet, so that the zero-voltage delay function is realized.

7. A multi-function trip unit according to claim 1 or 2, wherein: the sampling circuit is a simple circuit formed by discrete components or circuits such as a voltage transformer and the like, and the sampling circuit respectively samples pulsating direct current voltage output by the rectifying circuit and charging voltage of an energy storage capacitor in the energy storage circuit so as to supply the MCU circuit to carry out A/D conversion.

8. A multi-function trip unit according to claim 1 or 2, wherein: the MCU circuit is a singlechip, a DSP chip, an FPGA chip or a CPLD chip, comprises other combined circuits with A/D conversion function, converts analog quantity into digital quantity or inputs and outputs the digital quantity, and is provided with an intelligent unit of a timer, wherein the intelligent unit can realize operation.

9. A multi-function trip unit according to claim 1 or 2, wherein: the mode and delay setting circuit comprises a dip switch in a dual-in-line or other forms, a jumper and a binary rotary dial wheel, and the mode and delay setting circuit is set by a corresponding dial bit in the mode and delay setting circuit, when the bit is set to be ON, the mode is a zero-voltage instantaneous/delay working mode, when the bit is set to be OFF, the mode is a normal instantaneous/delay working mode, the mode and other one-bit or digit dial in the delay setting circuit are combined to be set, the delay time is determined, and if the bits are in a default OFF state, a representation delay value is 0, namely an instantaneous tripping mode; the delay time value characterized by one or more digits is a value of the type 8-4-2-1, or other value that is freely defined.

10. A multi-function trip unit according to claim 9, wherein: the delay time value represented by one bit or digit dialing code is the time value exclusive to each bit or the time value accumulated and summed to each bit.

11. A multi-function trip unit according to claim 1 or 2, wherein: the driving circuit is a circuit composed of power MOS tubes, an SCR, a triode or a relay and the like, and is controlled by the MCU circuit.

12. A multi-function trip unit according to claim 1 or 2, wherein: the undervoltage electromagnet is a spiral tube type or close-clapping type electromagnetic electromagnet, when the voltage of a power grid meets the action condition of the undervoltage electromagnet, the undervoltage electromagnet is electrified and attracted in advance under the control of the MCU circuit, and a movable iron core of the undervoltage electromagnet retracts to provide a closing condition for the circuit breaker; under the control of the MCU circuit in a conventional mode, the undervoltage electromagnet is powered off and released, and the movable iron core is popped up, so that the function of undervoltage tripping is realized; under the zero-voltage mode, under the control of the MCU circuit, the undervoltage electromagnet is enabled to be powered off and released instantly or in a delayed mode, and the movable iron core is popped out, so that the function of zero-voltage tripping is realized.

13. A multi-function trip unit according to claim 1 or 2, wherein: the closed electromagnet is a spiral tube type or close-beat type electromagnetic electromagnet, if the undervoltage electromagnet meets the action condition, the action condition is delayed for several seconds and then used as a necessary condition for reclosing, and the MCU circuit controls the closed electromagnet to act once, namely the movable iron core retracts to pop out once; the time delay and the action time value of the closed electromagnet are set by a program in the MCU circuit.

14. A multi-function trip unit according to claim 1 or 2, wherein: the output of the contact is enabled to be closed or opened once under the control of the MCU circuit through an embedded or triggered external relay, and the output action moment of the contact is kept synchronous with the undervoltage electromagnet or the closed electromagnet, or is arranged between the undervoltage electromagnet and the closed electromagnet or behind the undervoltage electromagnet and the closed electromagnet; the contact output is a purely mechanical contact closing or opening process without any electrical connection, as a command signal for an electric operating mechanism or as a remote time sequence control signal for a wind power cabinet.

15. A multi-function trip unit according to claim 1 or 2, wherein: the power circuit connected behind all the rectifying circuits is a switching power supply, a stabilized voltage power supply in the form of a power transformer or a series step-down circuit.

Technical Field

The invention relates to the field of low-voltage electrical appliances, in particular to a multifunctional release.

Background

The undervoltage release is an accessory (element) for monitoring whether the line voltage is under-voltage to execute relevant actions in the circuit breaker, according to the regulation of GB14148.1-2012 general rules of low-voltage switch equipment and control equipment, when the power voltage drops, even slowly drops to 70-30% of the rated working voltage, the undervoltage release should operate, and when the power voltage of the undervoltage release is equal to 30% of the rated working voltage of the release, the undervoltage release should prevent the circuit breaker from closing completely, a coil of the release loses power, a movable armature in the coil is provided with a reset spring to eject and open a locking mechanism, so that the circuit breaker is released and separated; when the power supply voltage is equal to or greater than 85% of the rated working voltage of the under-voltage tripper, under the thermal state condition, the reliable closing of the circuit breaker can be ensured, the coil of the tripper is electrified, the movable armature in the coil overcomes the spring force to suck and keeps certain torque-attraction under the action of the electromagnetic force of the coil, and the closing condition is provided for the closing of the circuit breaker. As a special zero-voltage undervoltage release, the zero-voltage undervoltage release realizes instant or time delay when the rated voltage is lower than 30 percent or the power is completely cut off.

Undervoltage trips are one of the important components of circuit breakers, especially frame circuit breakers. The essence of undervoltage tripping is an effective measure for preventing the current of the subordinate electrical equipment of the circuit breaker from being overlarge when the subordinate electrical equipment works in an undervoltage state, and the self heating of the electrical equipment is aggravated and even accidents occur. The operation modes can be divided into four working modes, namely a conventional under-voltage instantaneous or delay action type, a zero-voltage (no-voltage) instantaneous or delay action type and a second main type according to the types of the operation modes. The two major products have great differences in their working principles, and the existing products are usually produced by classified design and manufacturing. And subject to volume limitations, circuit breakers can only be incorporated into one type of undervoltage trip. However, in a power supply site using a circuit breaker, mode switching is often required, and the undervoltage release may be a conventional undervoltage release or a zero-voltage (no-voltage) undervoltage release, that is, a so-called multifunctional undervoltage release. In addition, on the unattended occasion, after the upstream line is powered off, the undervoltage tripper in the line of the current stage loses the working voltage to automatically execute the tripping action, and the breaker is opened. When the upstream line recovers power supply, the circuit breaker of the current stage cannot be switched on because the closing electromagnet does not act, and the inconvenience of the power supply recovery process is caused. An electric operating mechanism in the circuit breaker also needs a starting command, and only under the action of the operating command, the motor of the electric operating mechanism can be electrified, so that a pair of mechanical contacts is needed for controlling. In addition, the contact output can also be used as a control signal of other devices in the electric cabinet, such as remote time sequence control of the wind power cabinet.

CN202616742U discloses a zero-voltage delay release. The power supply comprises a filter circuit, a starting power supply circuit, an electromagnet for tripping control, a switch circuit, a delay circuit for controlling delay tripping, a control circuit for controlling on-off of the switch circuit, and a voltage-stabilized power supply circuit for providing power for the switch circuit and the control circuit, wherein the power input end of the filter circuit is connected with a power grid, the power output end of the filter circuit is connected with the power input end of the starting power supply circuit, and the power output end of the starting power supply circuit, the switch circuit and an electromagnet coil form a series circuit.

CN110767512A discloses an under-voltage release with wide voltage input, which comprises an EMC circuit, a rectifying circuit, an energy storage and voltage reduction circuit, a starting circuit, a sampling circuit, an MCU circuit, a switching circuit and an electromagnet; the EMC circuit is connected with the rectifying circuit, and after the input voltage is subjected to interference suppression by the EMC circuit, the rectifying circuit converts the alternating-current voltage into direct-current pulsating voltage; the direct current pulsating voltage is connected with a starting circuit, and the starting circuit provides high-voltage starting pulse for the electromagnet; the direct current pulsating voltage is connected with the energy storage and voltage reduction circuit to provide charging voltage, and the energy storage and voltage reduction circuit generates constant direct current voltage for storing energy and converts the constant direct current voltage into working voltage of related circuits through the voltage reduction circuit; the direct current pulsating voltage is connected with a sampling circuit, and a voltage signal generated by the sampling circuit is used for detecting by the MCU circuit; the MCU circuit is connected with the energy storage and voltage reduction circuit and controls the working state of the MCU circuit; the MCU circuit is connected with the switch circuit, and the on-off of the electromagnet is controlled through the switch circuit; the MCU circuit is connected with the starting circuit and controls the starting circuit to be cut off or conducted; the starting circuit is connected with the electromagnet to provide attraction high-voltage pulse; the MCU circuit judges that the sampling voltage meets the attraction condition, and then the electromagnet is switched on through the switching circuit, the electromagnet keeping voltage output by the energy storage and voltage reduction circuit is applied to the electromagnet but not enough to attract the electromagnet, the MCU circuit controls the starting circuit to generate a high-voltage pulse, and under the excitation of the pulse, the electromagnet is sucked and is in a keeping state, so that the circuit breaker is provided with a closing condition; after the MCU circuit judges that the sampling voltage meets the release condition, the electromagnet is controlled to be disconnected through the switch circuit, the electromagnet moving iron core pops out under the action of the reset spring, the circuit breaker locking mechanism is ejected, and the undervoltage tripping of the circuit breaker is realized.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a zero-voltage (no-voltage) undervoltage release which can be realized as a conventional general undervoltage release.

The purpose of the invention is realized by the following technical scheme.

A multifunctional release comprises an EMC filter circuit, a rectifying circuit, an energy storage circuit, an energy circuit, a power circuit, a sampling circuit, an MCU circuit, a driving circuit, a mode and delay setting circuit, an under-voltage electromagnet, a closed electromagnet and an output contact, wherein the EMC filter circuit is connected with the rectifying circuit, the rectifying circuit is connected with the energy storage circuit and the energy circuit, the energy circuit is connected with the electric MCU circuit and the magnet, the sampling circuit is connected with the rectifying circuit and the energy storage circuit, the MCU circuit is connected with the sampling circuit, the mode and delay setting circuit, the driving circuit and the energy circuit, the driving circuit is connected with the electromagnet, the closed electromagnet and the under-voltage contact output circuit, the under-voltage electromagnet is connected with the driving circuit and the energy circuit, the closed electromagnet is connected with the driving circuit and the energy storage circuit, the contact output is connected with the energy storage circuit and the driving circuit, and the power supply circuit provides working power supply for the MCU circuit, the energy storage circuit and the driving circuit.

The EMC filter circuit is used for bidirectionally suppressing interference signals generated by a power grid and an internal circuit, and the rectifying circuit converts alternating-current voltage into pulsating direct-current voltage.

Setting a working mode through a corresponding dialing bit in the mode and delay setting circuit, and setting a corresponding one-bit or digital dialing combination to determine delay time; under the control of the MCU circuit, an energy storage capacitor in the energy storage circuit is charged and discharged in an 'activation' mode, and the energy circuit supplies power to the undervoltage electromagnet; in the zero-voltage mode, after the voltage of the power grid is in voltage loss, the energy in the energy storage capacitor continuously supplies power to the undervoltage electromagnet until the time value defined by the dial.

The EMC filter circuit is a simple piezoresistor, a pi-type filter circuit such as LC (inductance-capacitance) or a complex filter formed by combining a series mode and a common mode component; the rectifier circuit is a full bridge circuit, or "full bridge" module, of a combination of discrete components.

The energy storage circuit is controlled by the MCU circuit, energy storage elements such as an energy storage capacitor or a storage battery are charged and discharged in an activated mode, when the charging voltage is higher than a set value, the charging is stopped, when the energy storage voltage is lower than the set value, the charging is started, the charging time is always synchronous with the zero crossing point of a power grid, and the charging time is integral multiple of the half period of the power grid so as to reduce the surge current to the maximum extent.

The energy circuit is controlled by the MCU circuit, the rectification pulsating voltage and the energy storage voltage which represent the input voltage of the power grid are judged to be high or low, when the pulsating voltage is higher than 0.3Ue, the pulsating voltage supplies power to the undervoltage electromagnet, when the pulsating voltage is lower than 0.3Ue and is not zero voltage, the pulsating voltage and the energy storage voltage jointly supply power to the undervoltage electromagnet, and when the pulsating voltage is zero, the energy storage voltage supplies power to the undervoltage electromagnet, so that the zero-voltage delay function is realized.

The sampling circuit is a simple circuit formed by discrete components or circuits such as a voltage transformer and the like, and the sampling circuit respectively samples pulsating direct current voltage output by the rectifying circuit and charging voltage of an energy storage capacitor in the energy storage circuit so as to supply the MCU circuit to carry out A/D conversion.

The MCU circuit is a singlechip, a DSP chip, an FPGA chip or a CPLD chip, comprises other combined circuits with A/D conversion function, converts analog quantity into digital quantity or inputs and outputs the digital quantity, and is provided with an intelligent unit of a timer, wherein the intelligent unit can realize operation.

The mode and delay setting circuit comprises a dip switch in a dual-in-line or other forms, a jumper and a binary rotary dial wheel, and the mode and delay setting circuit is set by a corresponding dial bit in the mode and delay setting circuit, when the bit is set to be ON, the mode is a zero-voltage instantaneous/delay working mode, when the bit is set to be OFF, the mode is a normal instantaneous/delay working mode, the mode and other one-bit or digit dial in the delay setting circuit are combined to be set, the delay time is determined, and if the bits are in a default OFF state, a representation delay value is 0, namely an instantaneous tripping mode; the delay time value characterized by one or more digits is a value of the type 8-4-2-1, or other value that is freely defined.

The delay time value represented by one bit or digit dialing code is the time value exclusive to each bit or the time value accumulated and summed to each bit.

The driving circuit is a circuit composed of power MOS tubes, an SCR, a triode or a relay and the like, and is controlled by the MCU circuit.

The undervoltage electromagnet is a spiral tube type or close-clapping type electromagnetic electromagnet, when the voltage of a power grid meets the action condition of the undervoltage electromagnet, the undervoltage electromagnet is electrified and attracted in advance under the control of the MCU circuit, and a movable iron core of the undervoltage electromagnet retracts to provide a closing condition for the circuit breaker; under the control of the MCU circuit in a conventional mode, the undervoltage electromagnet is powered off and released, and the movable iron core is popped up, so that the function of undervoltage tripping is realized; under the zero-voltage mode, under the control of the MCU circuit, the undervoltage electromagnet is enabled to be powered off and released instantly or in a delayed mode, and the movable iron core is popped out, so that the function of zero-voltage tripping is realized.

The closed electromagnet is a spiral tube type or close-beat type electromagnetic electromagnet, if the undervoltage electromagnet meets the action condition, the action condition is delayed for several seconds and then used as a necessary condition for reclosing, and the MCU circuit controls the closed electromagnet to act once, namely the movable iron core retracts to pop out once; the time delay and the action time value of the closed electromagnet are set by a program in the MCU circuit.

The output of the contact is enabled to be closed or opened once under the control of the MCU circuit through an embedded or triggered external relay, and the output action moment of the contact is kept synchronous with the undervoltage electromagnet or the closed electromagnet, or is arranged between the undervoltage electromagnet and the closed electromagnet or behind the undervoltage electromagnet and the closed electromagnet; the contact output is a purely mechanical contact closing or opening process without any electrical connection, as a command signal for an electric operating mechanism or as a remote time sequence control signal for a wind power cabinet.

The power circuit connected behind all the rectifying circuits is a switching power supply, a stabilized voltage power supply in the form of a power transformer or a series step-down circuit.

Compared with the prior art, the invention has the advantages that: the invention ensures that the power grid voltage is reliably attracted when the voltage is higher than 85% of the rated voltage, and after a period of time delay, the closed electromagnet acts once and the contact outputs once. The conventional undervoltage release and the zero-voltage release are combined into one, and the closing electromagnet is combined into the multifunctional release, so that the multifunctional release is a conceptual breakthrough, and the traditional closing electromagnet with an embedded control circuit is simplified into a pure coil type electromagnet. And the combination with the output of the contact can completely realize the unattended self-recovery power supply. And the whole circuit mechanism is simple, the holding power of the undervoltage electromagnet is strong, and the closing electromagnet and the contact output time can be flexibly changed by modifying the program.

Drawings

Fig. 1 is a schematic diagram of a circuit module of a multi-function trip unit of the present invention.

Fig. 2 is a schematic diagram of an EMC filter circuit and a rectifier circuit of a preferred embodiment of the multi-functional trip unit of the present invention.

Fig. 3 is a schematic diagram of a tank circuit, a sampling circuit and an energy circuit of a preferred embodiment of the multi-functional trip unit of the present invention.

Fig. 4 is a schematic diagram of the drive circuit, closing electromagnet and contact output of a preferred embodiment of a multi-function trip unit of the present invention.

Fig. 5 is a schematic diagram of the MCU circuit and the mode and delay setting circuits of a preferred embodiment of the multi-function trip of the present invention.

Fig. 6 is a power schematic of a preferred embodiment of a multi-function trip unit of the present invention.

Detailed Description

The invention is described in detail below with reference to the drawings and specific examples.

As shown in figure 1, the technical specification of the multifunctional release conforms to GB14048.1-2012 and GB14048.2-2012, and the multifunctional release comprises an EMC filter circuit for bidirectionally inhibiting interference signals generated by a power grid and an internal circuit, a rectifier circuit for converting alternating current voltage into pulsating direct current voltage, an energy storage circuit, an energy circuit, a power supply circuit, a sampling circuit, an MCU circuit, a driving circuit, a mode and delay setting circuit, an undervoltage electromagnet, a closed electromagnet and an output contact, wherein the EMC filter circuit is connected with the rectifier circuit, the rectifier circuit is connected with the energy storage circuit and the energy circuit, the energy circuit is connected with the electric MCU circuit and the magnet, the sampling circuit is connected with the rectifier circuit and the energy storage circuit, the MCU circuit is connected with the sampling circuit, the mode and delay setting circuit, the driving circuit and the energy circuit, and the driving circuit is connected with the undervoltage electromagnet, The closed electromagnet is connected with the contact output circuit, the undervoltage electromagnet is connected with the driving circuit and the energy circuit, the closed electromagnet is connected with the driving circuit and the energy storage circuit, the contact output is connected with the energy storage circuit and the driving circuit, and the power supply circuit provides a working power supply for the MCU circuit, the energy storage circuit and the driving circuit.

The multifunctional release sets the working mode through the corresponding dialing bit in the mode and delay setting circuit, and the corresponding one-digit or digit dialing combination is set to determine the delay time. Under the control of the MCU circuit, an energy storage capacitor in the energy storage circuit is charged and discharged in an 'activation' mode, and the energy circuit supplies power to the undervoltage electromagnet. In the zero-voltage mode, after the voltage of the power grid is lost (power is cut off), the energy in the energy storage capacitor continuously supplies power to the undervoltage electromagnet until the time value defined by the dial.

The EMC filter circuit can be simple piezoresistor, LC pi-type filter circuit or complex filter combined by series mode and common mode components. The rectifier circuit may be a full bridge circuit of a combination of discrete components, or a "full bridge" module.

The energy storage circuit is controlled by the MCU circuit, wherein energy storage elements such as an energy storage capacitor or a storage battery are charged and discharged in an 'activation' mode, when the charging voltage is higher than a set value, the charging is stopped, and when the energy storage voltage is lower than a set value, the charging is started. And the charging time is always kept synchronous with the zero crossing point of the power grid, and the charging time is integral multiple of the half cycle of the power grid so as to reduce the surge current to the maximum extent.

The energy circuit is controlled by the MCU circuit, the rectified pulsating voltage and the stored energy voltage which represent the input voltage of the power grid are judged to be high or low, when the pulsating voltage is higher than 0.3Ue, the pulsating voltage supplies power to the undervoltage electromagnet, when the pulsating voltage is lower than 0.3Ue and is not zero voltage (non-power-off), the pulsating voltage and the stored energy voltage jointly supply power to the undervoltage electromagnet, and when the pulsating voltage is zero, the stored energy voltage supplies power to the undervoltage electromagnet, so that the zero-voltage delay function is realized.

The sampling circuit can be a simple circuit formed by discrete components, and can also be in the form of circuits such as a voltage transformer and the like, and the sampling circuit respectively samples the pulsating direct current voltage output by the rectifying circuit and the charging voltage of an energy storage capacitor in the energy storage circuit so as to supply the MCU circuit to carry out A/D conversion.

The MCU circuit comprises a singlechip, a DSP, an FPGA, a CPLD and other chip forms, and also comprises other combined circuits with A/D conversion function. The intelligent unit can convert analog quantity into digital quantity, can input and output digital quantity, and is provided with a timer and can realize operation.

The mode and delay setting circuit comprises a dip switch, a jumper, a binary rotary dial wheel and the like in a dual-in-line or other form, when the bit is set to be ON (or OFF), a multifunctional release is in a zero-voltage (voltage loss) instantaneous/delay working mode through setting corresponding dial bits in the mode and delay setting circuit, when the bit is set to be OFF (or ON), the multifunctional release is in a normal (non-zero-voltage/voltage loss) instantaneous/delay working mode, the mode and other one-bit or digit dial combination in the delay setting circuit are set, delay time is determined, and if the bits are in a default (OFF) state, a characteristic delay value is 0, namely an instantaneous release mode. The delay time value represented by the one-bit or digital dial code can be a numerical value of 8-4-2-1 type, and can also be other numerical values which are freely defined. Furthermore, the delay time value represented by one or more dialing codes can be a time value exclusive to each bit or a time value accumulated and summed to each bit.

The driving circuit can be a circuit formed by power MOS tubes, SCR, a triode, a relay or other circuit forms. The driving circuit is controlled by the MCU circuit.

The undervoltage electromagnet can be a spiral tube type or close-clapping type electromagnetic electromagnet in various forms, if the power grid voltage meets the action condition of the undervoltage electromagnet, if the power grid voltage is greater than 85% Ue, the undervoltage electromagnet is electrified and attracted in advance under the control of the MCU circuit, and a movable iron core of the undervoltage electromagnet retracts to provide a closing condition for the circuit breaker. Under the control of the MCU circuit, the undervoltage electromagnet is powered off and released, and the movable iron core is popped up to realize the function of undervoltage tripping under the normal mode, if the voltage of the power grid is lower than 70% Ue (or other values but not less than 30% Ue). Under the zero-voltage mode, if the voltage of the power grid is lower than 30% Ue (or power failure, zero voltage), under the control of the MCU circuit, the undervoltage electromagnet is enabled to be powered off and released instantly or in a delayed mode, and the movable iron core is popped out, so that the function of zero-voltage tripping is realized.

If the undervoltage electromagnet meets the action condition, the action is delayed for several seconds and then is used as a necessary condition for reclosing, and the MCU circuit controls the action of the closed electromagnet to be carried out once (the movable iron core of the closed electromagnet retracts to pop up once). The time delay and the action time value of the closed electromagnet can be set by a program in the MCU circuit.

Through the embedded or external relay that triggers, under MCU circuit control, make the contact output closed (or disconnection) once, provide convenience for expanding external function. The contact output action time can be kept synchronous with the undervoltage electromagnet, can also be kept synchronous with the closing electromagnet, or is arranged between the undervoltage electromagnet and the closing electromagnet or behind the undervoltage electromagnet and the closing electromagnet. The contact output is a pure mechanical contact closing or opening process without any electrical connection, and can be used as an instruction signal of an electric operating mechanism and a remote time sequence control signal of a wind power cabinet.

The power supply circuit connected to all the rectifying circuits may be in the form of a switching power supply, a regulated power supply in the form of a power transformer, a series step-down circuit, or the like.

In fig. 2, a piezoresistor RV1, a high-voltage capacitor CX1, a surge suppression resistor R0, a common mode filter L1 and the high-voltage capacitor CX2 form an EMC filter circuit, RV1 is used for resisting high-voltage pulse interference from the outside, and CX1, L1 and CX2 form a pi-type filter for suppressing interference of lightning stroke, pulse group and the like from a power supply of a power grid and also suppressing high-voltage pulse interference possibly generated by an internal circuit. The diodes D1, D2, D3 and D4 form a full-wave rectifying circuit, the + end of the output of the full-wave rectifying circuit is defined as VH, and the output-end of the full-wave rectifying circuit is defined as Ground (GND).

In fig. 2, resistors RA1 and RA2 form a voltage division sampling loop of the grid voltage, a capacitor C1 filters high frequency components of the sampled signal, the voltage division value is defined as SA, the signal has a strict proportional relation with VH, and the phase delay is not more than 0.01 ms. Resistors RB1 and RB2 form a voltage division sampling loop of the charging voltage VM, the divided voltage value is defined as SB, and the magnitude of the signal is indicative of the charging voltage VM.

At the moment of power-on, the output control end CK of the MCU circuit is in a high-resistance state, the triode Q2 is in a cut-off state, the VH voltage is limited by the current-limiting resistor R1 and provides voltage for the N-type MOS transistor Q1, the resistor R2 pulls up the grid point position of the Q1, the Q1 is conducted, and the energy-storage capacitor CDT is charged through isolation of the diode D6. A zener diode Z2 limits the gate-drain voltage of Q1. The voltage on the CDT rises step by step, the power supply circuit establishes 12V and 5V voltages, and the MCU in the MCU circuit starts to work. The MCU determines whether the SB signal is charged to a predetermined upper limit Value (VMH) by A/D conversion, if yes, the output control signal CK is changed into a high level signal when VH is at a zero crossing point, a base current is provided to a triode Q2 through a resistor R8, Q2 is conducted, the grid potential of Q1 is pulled down through a resistor R3, and charging is stopped. If not, the MCU continues to output CK as a low level signal. During normal operation, if the energy storage voltage is discharged and falls to a certain lower limit Value (VML), the MCU also turns CK to low level at the VH zero crossing point, and Q1 is enabled to start charging. That is, the start-stop process of charging is completely synchronous with the VH zero crossing point, and the surge current is reduced to the maximum extent. The difference between VMH and VML is the activation voltage of the energy storage capacitor. Z1 serves as a clipping protection for the highest charging voltage.

In fig. 3, diodes D5, D7 and P-type MOS transistor Q3 form an energy circuit, D5 prevents reverse current, and D7 isolates the voltage when VH is higher than VM, protecting Q3. When the VH voltage value representing the power grid voltage value is greater than 30% Ue, Q3 is closed under the action of the CK control signal output by the MCU, and only VH supplies power to the undervoltage electromagnet. When the voltage value of VH representing the voltage value of the power grid is less than 30% Ue or zero, Q3 is conducted, and VH and VM jointly supply power to the undervoltage electromagnet.

The resistor R1 is a charging current-limiting resistor, the grid of an R2 pull-up N-type MOS tube Q1 is at a high level, the diode D6 is a charging isolation resistor, the capacitor CDT is an energy storage capacitor, the voltage regulator tube Z2 limits the grid leakage voltage of the Q1, the triode Q2 is connected with the grid of the Q1 through the current-limiting resistor R3, the voltage regulator tube Z1 limits the highest voltage value of the grid of the Q1, when a control signal CK from the MCU circuit is at a high level, the Q2 is switched on, the grid of the Q1 is pulled down and switched off to stop charging, and when the CK is at a low level, the grid of the Q1 is pulled up to be switched on to.

In fig. 4, the resistors R4 to R7, the transistors Q4 to Q6 and the N-type MOS transistor Q7 constitute an undervoltage trip driving circuit. When the PWM signal from the MCU is high, Q4 turns off without a base bias voltage, R6 pulls up Q6 to high and turns off, the high provides a base bias current to Q5 through R5, Q5 turns on, the Q7 gate is pulled down to low, and the gate charge is discharged. When it is low, Q5 is turned off, Q4 is turned on by R4 obtaining bias current, Q4 collector current is turned on by R6 pulling down Q6 base, the 12V voltage charges Q7 through R7, and Q7 turns on rapidly. In cycles, the undervoltage electromagnet obtains a voltage value determined by the PWM duty cycle. Diode D8 is used for undervoltage electromagnet freewheeling when Q7 is cut off.

The MCU outputs a control signal CB, when the control signal CB is at a high level, the N-type MOS tube Q8 is conducted, the closing electromagnet is electrified, after the CB signal is converted into a low level, the Q8 is cut off, the closing electromagnet is not electrified, and the diode D9 is used for closing electromagnet follow current when the Q8 is cut off.

The MCU outputs a control signal CJ, when the control signal CJ is at a high level, the triode Q9 is conducted, the relay JK1 is electrified, a normally open contact of the relay is closed, after the CJ signal is converted into a low level, the Q9 is cut off, the JK1 normally open contact is disconnected, and the diode D10 is used for enabling the relay to continue current when the Q9 is cut off.

In fig. 5, the MCU circuit is a circuit with a single chip as a main form and a multi-interface a/D conversion, the analog channel is connected to SA, VH voltage values are sampled at a rate of 32 times per 10 milliseconds in real time, the sampled values are stored in an array form, a period effective value is obtained, and VH zero-crossing time is obtained by using an "inverted triangle" method. And the analog channel is connected with SB, the VM voltage value is sampled in real time at the rate of 4 times per 10 milliseconds, and the average value of the energy storage voltage is calculated.

When the effective value of VH exceeds 85% Ue, the channel outputs PWM signal, and the undervoltage electromagnet is controlled by changing duty ratio to obtain a lower working voltage. And outputting a CK signal according to the conditions of the energy storage capacitors VMH and VML and the VH zero crossing point condition to control the working state of the charging loop. After the under-voltage electromagnet is electrified to work, a time which can be determined by a program is delayed, a CM signal is output, and the action of closing the electromagnet is controlled once. Similarly, after the undervoltage electromagnet is electrified to work, the CJ signal is output after a time which can be determined by a program is delayed, and the relay is controlled to act once.

The MCU reads setting states of the DIP codes, wherein 1-bit DIP codes are used for setting a conventional/zero-voltage (voltage loss) mode, if N/Z is ON, the normal working mode is defined, if the effective value of VH is lower than 70% Ue, whether time delay is needed or not is further judged, if the time delay value is up, the MCU makes PWM signals be high level, the undervoltage electromagnet is de-energized, the movable iron core pops up to realize tripping action, and if no time delay exists, the trip is immediately carried out. And if the effective value of the VH is lower than 30% of the Ue, the trip is immediately carried out. If N/Z is defined as zero-voltage (voltage loss) working mode when OFF, if the effective value of VH is lower than 30% Ue, further judging whether time delay is needed, if the time delay value is up, MCU makes PWM signal be high level, undervoltage electromagnet is deenergized, movable iron core pops up to realize tripping action, if no time delay, then immediate tripping is realized. The other 6 bits are used for setting delay values, the delay values set for each bit are respectively 0.3s, 0.5s, 0.7s, 1s, 3s and 5s, the delay values are calculated by adopting a combined accumulated sum method, when each bit is ON, the maximum value is 10.5s, and 63 delay combinations are counted.

In fig. 6, the VM voltage connected to the charging voltage output terminal, the resistor RW2 provides a bias current for the voltage regulator tube Z1 that provides the base voltage for the transistor WT, the resistor RW1 partially reduces the voltage, the transistor WT is a tuning tube, the resistor RW3 is a shunt resistor, the capacitor CD1 filters smoothly, the CD2 eliminates high-frequency noise, the voltage regulator tube Z2 plays a role in protection, and the output 12V voltage provides a working voltage for the driving circuit. The 12V voltage is regulated to 5V by a voltage regulator W12 to provide working voltage for the MCU, and the capacitor CD3 suppresses high-frequency noise in the 5V loop.

When the voltage of the power grid meets the starting condition of the undervoltage release, the undervoltage electromagnet is electrified for actuation, a first closing condition is established for the circuit breaker, the electromagnet is closed for one time after time delay of several seconds, a second closing condition is established for the circuit breaker, and the contact outputs for one time after time delay of several seconds, so that the electric operating mechanism is electrified for starting closing or other equipment is controlled in an integrated manner.

When the multifunctional release is set to be in the normal working mode, when the voltage of a power grid is lower than a certain value (but not lower than 30%) of 70% or below of the rated voltage, if all the delay dial codes are set to be zero, instantaneous release is carried out, otherwise, release is carried out after delay according to the delay value set by the delay dial codes. In the delay stage, if the voltage of the power grid is lower than 30% of the rated voltage, the tripping action is executed no matter whether the delay is finished or not. And if the voltage of the power grid is recovered to 70% of Ue, the tripping delay is automatically released. When the multifunctional release is set to be in a zero-voltage (voltage loss) mode, when the voltage of a power grid is lower than 30% of the rated voltage or completely without electricity, if all delay dial codes are set to be zero, instantaneous release is carried out, otherwise, release is carried out after delay according to a delay value set by the delay dial codes. And if the voltage of the power grid is recovered to 30% of Ue, the tripping delay is automatically released. And setting dial codes in a switching mode, and automatically changing the internal default working parameters of the multifunctional release.

According to the invention, through program control, after the undervoltage electromagnet is electrified, the action of the closing electromagnet is enabled to be delayed for a plurality of seconds, so that a second closing condition is provided for the circuit breaker.

In the invention, through program control, after the under-voltage electromagnet is electrified, the contact output action is enabled once after a plurality of seconds of delay, or an electric operating mechanism of a breaker is started to automatically switch on, or other devices are jointly controlled by the contact output.

In the invention, an 'activation' charging and discharging technology is adopted, and the charging and discharging starting and stopping time is synchronous with the zero crossing point of a power grid, so that the service life of the energy storage capacitor is prolonged, and the surge current is restrained.

In the invention, in order to fully reduce the power consumption of a device for charging the capacitor in the energy storage loop and reduce the heat productivity, the electromagnet is powered by the energy storage voltage only when the voltage of a power grid is less than 30 percent or power failure occurs.

The invention discloses a multifunctional undervoltage release, which aims to solve the problem that the existing undervoltage release is divided into two types of conventional general type and zero voltage (voltage loss), and a breaker can only be assembled on one type but a power supply site needs to use respective advantages. On the basis, the closed electromagnet is controlled to work in a linkage mode, and necessary conditions are provided for closing of the circuit breaker. And the automatic reclosing function of the circuit breaker is realized through a contact output mode.

A multifunctional release can be set to a zero-voltage (no-voltage) instantaneous/delayed working mode and can be set to a normal (non-zero-voltage/no-voltage) instantaneous/delayed working mode through setting corresponding dialing bits in a mode and delay setting circuit, the mode and corresponding one-bit or digit dialing in the delay setting circuit are set in a combined mode, delay time is determined, and if the bits are in a default state, a delay value is 0, namely an instantaneous release mode. If the power grid voltage meets the working condition of the undervoltage electromagnet, the time is delayed for several seconds, the MCU circuit sends a signal, the driving circuit enables the closed electromagnet to act once, and meanwhile, the contact output is enabled to be closed once, so that convenience is provided for expanding external functions. The multifunctional tripper can be an independent under-voltage instantaneous/delay under-voltage tripper or a zero-voltage instantaneous/delay under-voltage tripper, and provides great convenience for automatically recovering power supply in unattended occasions by jointly controlling the closed electromagnet, and the potential functions of the tripper are further expanded by contact output.