阅读说明：本技术 电源综合保护装置 (Power supply comprehensive protection device ) 是由 杨元德 于 2019-12-11 设计创作，主要内容包括：本发明公开了一种电源综合保护装置,包括主回路断路器QF、主接触器、三相电源保护器JS、电源保护器常开触点KT-1、延时继电器以及第一中间继电器,所述主回路断路器QF具有处于同一工作状态的三个开关QF-1、QF-2、QF-3,所述主接触器具有一线圈KM-1以及三个常开主触点KM-2、KM-3、KM-4,所述延时继电器具有一线圈JS-1以及一常开触点JS-2,所述第一中间继电器具有一线圈ZJ-1、一常闭触点ZJ-2以及一常开触点ZJ-3；所述主回路断路器QF的三个开关QF-1、QF-2、QF-3的第一端分别与三相交流电的A相、B相及C相连接。本发明的电源综合保护装置结构简单巧妙。(The invention discloses a power supply comprehensive protection device which comprises a main circuit breaker QF, a main contactor, a three-phase power supply protector JS, a normally-open contact KT-1 of the power supply protector, a time delay relay and a first intermediate relay, wherein the main circuit breaker QF is provided with three switches QF-1, QF-2 and QF-3 which are in the same working state, the main contactor is provided with a coil KM-1 and three normally-open main contacts KM-2, KM-3 and KM-4, the time delay relay is provided with a coil JS-1 and a normally-open contact JS-2, and the first intermediate relay is provided with a coil ZJ-1, a normally-closed contact ZJ-2 and a normally-open contact ZJ-3; first ends of three switches QF-1, QF-2 and QF-3 of the main circuit breaker QF are respectively connected with an A phase, a B phase and a C phase of three-phase alternating current. The power supply comprehensive protection device has a simple and ingenious structure.)

1. A power supply comprehensive protection device comprises a main loop breaker QF, a main contactor, a three-phase power supply protector JS, a time delay relay, a first intermediate relay, a single-phase power supply protector JS' and a second intermediate relay, the main circuit breaker QF comprises switches QF-1, QF-2 and QF-3 in the same working state, the main contactor comprises a coil KM-1 and three normally open main contacts KM-2, KM-3 and KM-4, the time delay relay is provided with a coil JS-1 and a normally open contact JS-2, the first intermediate relay is provided with a coil ZJ-1, a normally closed contact ZJ-2 and a normally open contact ZJ-3, the second intermediate relay comprises a coil ZJ-1 ', a normally closed contact ZJ-2 ' and a normally open contact ZJ-3 '; the first ends of the switches QF-1, QF-2 and QF-3 of the main loop breaker QF are respectively connected with the phase A, the phase B and the phase C of a three-phase alternating current power supply side, the first ends of the normally-open main contacts KM-2, KM-3 and KM-4 of the main contactor are respectively connected with the second ends of the switches QF-1, QF-2 and QF-3 of the main loop breaker QF, the second ends of the three normally-open main contacts KM-2, KM-3 and KM-4 of the main contactor are connected with an electric load needing to be protected, and a control power supply is taken from the main breaker QF and then sent to each control loop; a coil KM-1 of the main contactor sequentially passes through a normally closed contact ZJ-2' of the second intermediate relay and a normally closed contact ZJ-2 of the first intermediate relay and then is connected with a second end of the switch QF-1 to be connected with a live wire 101 of a control power supply, and a second end of the coil KM-1 is connected with a null wire 102 of the control power supply to form a main control loop; three signal terminals L1, L2 and L3 of the three-phase power supply protector JS are respectively connected with the second ends of the switches QF-1, QF-2 and QF-3 to provide detection signals for the three-phase power supply protector; a first end of a coil JS-1 of the delay relay is connected with a second end of the switch QF-1 through a normally open contact JS1 of the power protector JS so as to be connected with a control power live wire 101, and a second end of the coil JS-1 of the delay relay is connected with a zero line N of the three-phase alternating current so as to form an anti-misoperation control loop; the first end of a coil ZJ-1 of the first intermediate relay is connected with the second end of the switch QF-1 through a normally open contact JS-2 of the time delay relay, a node between the coil ZJ-1 of the first intermediate relay and the normally open contact JS-2 is also connected with a zero line N of the three-phase alternating current, the second end of the coil ZJ-1 of the first intermediate relay is connected with the zero line N of the three-phase alternating current, and the normally open contact ZJ-3 is connected with the normally open contact JS-2 in parallel to form an action self-holding loop of the first intermediate relay; the first end of a coil ZJ-1 ' of the second intermediate relay is connected with the second end of the switch QF-1 through the normally open contact ZJ-3 ', the second end of the coil ZJ-1 ' is connected with a zero line N of three-phase alternating current, 11 pins and 14 pins of the single-phase power supply protector are normally contacts and are connected with the coil ZJ-1 ' of the second intermediate relay in series to form a neutral point disconnection and phase unbalance protection loop, the normally open contact ZJ-3 ' of the second intermediate relay is connected with the normally open contact of a single-phase power supply protector JS2 in parallel to form an action holding loop of the second intermediate relay ZJ2, an A1 power supply pin of the single-phase power supply protector is connected with a control power supply live wire 101, an A2 power supply pin of the single-phase power supply protector is connected with the zero line N, a B terminal of the single-phase power supply protector JS is connected with a neutral point of a power supply area needing protection through a No. 200, and the C terminal of the single-phase power supply protector JS' is grounded to form a neutral point potential detection loop.

2. The power source comprehensive protection device according to claim 1, characterized in that: still include a doublestage control switch ZK, doublestage control switch ZK's first motionless end with switch QF-1's second end is connected, first motional end with normally closed contact ZJ-2, normally open contact KT-1, normally open contact ZJ-3, normally open contact JS-2, normally open contact ZJ-3 'and single phase power supply protector JS's 11 pins and A1 pins are all connected, second motionless end with three-phase alternating current's zero line N is connected, second motional end and coil KM-1, delay line electrical apparatus's coil JS-1, first intermediate line electrical apparatus's coil ZJ-1, second intermediate relay's line ZJ-1 'and single phase power supply protector JS's 14 pins and A2 pins are all connected.

3. The power source comprehensive protection device according to claim 2, characterized in that: the single-pole double-throw switch comprises a coil ZJ-1, and is characterized by further comprising a reset normally-closed switch AF1, wherein the first end of the coil ZJ-1 is connected with the first movable end of the single-pole double-throw switch ZK1 sequentially through the normally-open contact ZJ-3 and the reset normally-closed switch AF 1.

4. The power source comprehensive protection device according to claim 2, characterized in that: the power supply further comprises a reset normally closed switch AF2, wherein the first end of the coil ZJ-1 'sequentially informs the normally open contact ZJ-3' and the reset normally closed switch AF2 to be connected with the first movable end of the single-pole double-throw switch ZK 1.

5. The power source comprehensive protection device according to claim 2, characterized in that: the fault lamp HR further comprises a fault lamp HR, the main contactor is further provided with a normally-open auxiliary contact KM-5, the first end of the fault lamp HR is connected with the first movable end of the single-pole double-throw switch ZK1 through the normally-open auxiliary contact KM-5, and the second end of the fault lamp HR is connected with the second movable end of the single-pole double-throw switch ZK 1.

6. The power source comprehensive protection device according to claim 2, characterized in that: the power supply circuit also comprises a working indicator lamp GD, wherein the first end of the working indicator lamp GD is directly connected with the first moving end of the single-pole double-throw switch ZK, and the second end of the working indicator lamp GD is directly connected with the second moving end of the single-pole double-throw switch ZK so as to be connected between the control loop 101 and the control loop 102 in series to form a power supply indicating loop.

7. The power source comprehensive protection device according to claim 2, characterized in that: still include a fault lamp YD1, the first end of fault lamp YD1 with the coil ZJ-1 of first auxiliary relay with the nodal connection between the normally open contact JS-2, the second end with single-pole double-throw switch ZK's second moves the end and connects in series between the first end 113 of first auxiliary relay's coil and control power zero line 102 to form phase sequence fault indication return circuit.

8. The power source comprehensive protection device according to claim 2, characterized in that: still include a fault lamp YD2, the first end of fault lamp YD2 with the 14 pins of single phase power supply protector JS ' with the nodal connection between the coil ZJ-1 ' of second auxiliary relay, the second end with the second of single-pole double-throw switch ZK moves the end and connects in series between the first end 117 of the coil ZJ-1 ' of second auxiliary relay and control power zero line 102 to form the neutral point fault indication return circuit.

9. The power source comprehensive protection device according to claim 1, characterized in that: the main breaker QF is a three-stage breaker.

10. The power source comprehensive protection device according to claim 1, characterized in that: the main breaker QF is a four-stage breaker.

Technical Field

The invention relates to a power supply comprehensive protection device.

Background

The broadcast television system, the computer room, the communication room and various automatic control equipment, etc. are mostly made of electronic components, these devices have high requirements on the quality of the input power, in particular on the stability of the voltage, whereas conventional power distribution circuits generally employ only circuit breaker control, for over-voltage, surge protector is used to eliminate short-time pulse over-voltage, and to protect short-circuit, system leakage and short-time pulse over-voltage, no protection function for phase loss and long-term overvoltage, such as overvoltage of loop voltage at the electricity utilization side caused by disconnection of a system neutral point, failure of the fault circuit breaker, poor effectiveness of surge protection, the overvoltage exceeds the bearing limit of electronic components, and the overvoltage exceeding the threshold value for a long time can cause permanent damage to electronic equipment, cause economic loss and seriously cause secondary disasters such as fire and the like. The overvoltage caused by the disconnection of the neutral point is very high, and the equipment which is not disconnected as long as the access system is basically damaged, so that the influence surface is very large. Three-phase motors and other devices are sensitive to phase loss, and circuit breakers are not protected due to the fact that the three-phase motors and other devices are burnt out due to the phase loss.

Referring to fig. 1 to 3, in the case of a fault of a front-end disconnection, due to inconsistency of electrical equipment connected to a system in each loop (for example, power difference of the electrical equipment connected to each loop, temporal inconsistency of the electrical equipment connected to each loop, for example, large electricity consumption in a machine room during working time, large electricity consumption in a living facility during next working time), the resistances of the loops are the same, so that the phase voltages distributed to the loops are different, the resistance of a high-power device is low, the voltages at two ends of the high-power device are low, the resistance of a low-power device is high, the voltages at two ends of the low-power device are high, and the device is easily burned.

In real life, the neutral point is broken due to various reasons, so that the large-area electric equipment is damaged, and the motor and other electric equipment are damaged due to phase loss and system overvoltage.

Disclosure of Invention

Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: the power supply comprehensive protection device has a simple structure, is convenient to maintain, can identify the disconnection fault of a system neutral point and the overvoltage and undervoltage states of the system and protects equipment from being burnt out due to distribution places.

In order to solve the technical problems, the invention adopts a technical scheme that: provides a power supply comprehensive protection device, which comprises a main loop breaker QF, a main contactor, a three-phase power supply protector JS, a time delay relay, a first intermediate relay, a single-phase power supply protector JS' and a second intermediate relay, the main circuit breaker QF comprises switches QF-1, QF-2 and QF-3 in the same working state, the main contactor comprises a coil KM-1 and three normally open main contacts KM-2, KM-3 and KM-4, the time delay relay is provided with a coil JS-1 and a normally open contact JS-2, the first intermediate relay is provided with a coil ZJ-1, a normally closed contact ZJ-2 and a normally open contact ZJ-3, the second intermediate relay comprises a coil ZJ-1 ', a normally closed contact ZJ-2 ' and a normally open contact ZJ-3 '; the first ends of the switches QF-1, QF-2 and QF-3 of the main loop breaker QF are respectively connected with the phase A, the phase B and the phase C of a three-phase alternating current power supply side, the first ends of the normally-open main contacts KM-2, KM-3 and KM-4 of the main contactor are respectively connected with the second ends of the switches QF-1, QF-2 and QF-3 of the main loop breaker QF, the second ends of the three normally-open main contacts KM-2, KM-3 and KM-4 of the main contactor are connected with an electric load needing to be protected, and a control power supply is taken from the main breaker QF and then sent to each control loop; a coil KM-1 of the main contactor sequentially passes through a normally closed contact ZJ-2' of the second intermediate relay and a normally closed contact ZJ-2 of the first intermediate relay and then is connected with a second end of the switch QF-1 to be connected with a live wire 101 of a control power supply, and a second end of the coil KM-1 is connected with a null wire 102 of the control power supply to form a main control loop; three signal terminals L1, L2 and L3 of the three-phase power supply protector JS are respectively connected with the second ends of the switches QF-1, QF-2 and QF-3 to provide detection signals for the three-phase power supply protector; a first end of a coil JS-1 of the delay relay is connected with a second end of the switch QF-1 through a normally open contact JS1 of the power protector JS so as to be connected with a control power live wire 101, and a second end of the coil JS-1 of the delay relay is connected with a zero line N of the three-phase alternating current so as to form an anti-misoperation control loop; the first end of a coil ZJ-1 of the first intermediate relay is connected with the second end of the switch QF-1 through a normally open contact JS-2 of the time delay relay, a node between the coil ZJ-1 of the first intermediate relay and the normally open contact JS-2 is also connected with a zero line N of the three-phase alternating current, the second end of the coil ZJ-1 of the first intermediate relay is connected with the zero line N of the three-phase alternating current, and the normally open contact ZJ-3 is connected with the normally open contact JS-2 in parallel to form an action self-holding loop of the first intermediate relay; the first end of a coil ZJ-1 ' of the second intermediate relay is connected with the second end of the switch QF-1 through the normally open contact ZJ-3 ', the second end of the coil ZJ-1 ' is connected with a zero line N of three-phase alternating current, 11 pins and 14 pins of the single-phase power supply protector are normally contacts and are connected with the coil ZJ-1 ' of the second intermediate relay in series to form a neutral point disconnection and phase unbalance protection loop, the normally open contact ZJ-3 ' of the second intermediate relay is connected with the normally open contact of a single-phase power supply protector JS2 in parallel to form an action holding loop of the second intermediate relay ZJ2, an A1 power supply pin of the single-phase power supply protector is connected with a control power supply live wire 101, an A2 power supply pin of the single-phase power supply protector is connected with the zero line N, a B terminal of the single-phase power supply protector JS is connected with a neutral point of a power supply area needing protection through a No. 200, and the C terminal of the single-phase power supply protector JS' is grounded to form a neutral point potential detection loop.

Further, the power integrated protection device still includes a two-stage control switch ZK, two-stage control switch ZK's first motionless end with switch QF-1's second end is connected, first motional end with normally closed contact ZJ-2, normally open contact KT-1, normally open contact ZJ-3, normally open contact JS-2, normally open contact ZJ-3 ' and single phase power supply protector JS's 11 pins and A1 pins are all connected, second motionless end with the zero line N of three-phase alternating current is connected, second motional end and coil KM-1, delay line electric appliance's coil JS-1, first intermediate line electric appliance's coil ZJ-1, second intermediate relay's line ZJ-1 ' and single phase power supply protector JS's 14 pins and A2 pin all are connected.

Furthermore, the power supply comprehensive protection device also comprises a reset normally closed switch AF1, and the first end of the coil ZJ-1 is connected with the first movable end of the single-pole double-throw switch ZK1 sequentially through the normally open contact ZJ-3 and the reset normally closed switch AF 1.

Furthermore, the power supply comprehensive protection device also comprises a reset normally closed switch AF2, wherein the first end of the coil ZJ-1 'sequentially informs the normally open contact ZJ-3' and the reset normally closed switch AF2 to be connected with the first movable end of the single-pole double-throw switch ZK 1.

Furthermore, the power supply comprehensive protection device also comprises a fault lamp HR, the main contactor is also provided with a normally open auxiliary contact KM-5, the first end of the fault lamp HR is connected with the first movable end of the single-pole double-throw switch ZK1 through the normally open auxiliary contact KM-5, and the second end of the fault lamp HR is connected with the second movable end of the single-pole double-throw switch ZK 1.

Furthermore, the power supply comprehensive protection device further comprises a work indicator lamp GD, wherein a first end of the work indicator lamp GD is directly connected with a first moving end of the single-pole double-throw switch ZK, and a second end of the work indicator lamp GD is directly connected with a second moving end of the single-pole double-throw switch ZK so as to be connected between the control loops 101 and 102 in series to form a power supply indication loop.

Further, the power integrated protection device still includes a fault lamp YD1, the first end of fault lamp YD1 with the coil ZJ-1 of first auxiliary relay with the nodal connection between the normally open contact JS-2, the second end with the second of single-pole double-throw switch ZK is moved the end and is connected to concatenate in between the coil first end 113 of first auxiliary relay and the control power zero line 102 to form phase sequence fault indication return circuit.

Further, the power supply integrated protection device further comprises a fault lamp YD2, the first end of the fault lamp YD2 and the 14 pins of the single-phase power supply protector JS ' are connected with the node between the coil ZJ-1 ' of the second intermediate relay, the second end is connected with the second moving end of the single-pole double-throw switch ZK, and the first end 117 of the coil ZJ-1 ' of the second intermediate relay is connected with the control power supply zero line 102 in series, so that a neutral point fault indication loop is formed.

Further, the main breaker QF is a three-stage breaker.

Further, the main breaker QF is a four-stage breaker.

The power supply comprehensive protection device has the advantages of simple circuit structure and ingenious design, and adopts electronic components to realize comprehensive protection of the power supply, thereby being convenient for maintenance. The power supply comprehensive protection device can automatically identify the system neutral point disconnection fault and the system overvoltage and undervoltage states, and protect sensitive equipment from being burnt due to overvoltage. The three-phase sequence fault and the open-phase fault of the main power supply can be automatically identified, and electric equipment such as a three-phase motor and the like is protected. It can prevent the short-time pulse fluctuation of the main power supply from malfunction. The defects of the existing power distribution equipment protection scheme are eliminated.

Drawings

Fig. 1 is a state diagram of a fault loop of a neutral point of a three-phase power supply system in a broken line. The system comprises a power supply circuit, a load control circuit and a control circuit, wherein Ra is the load connected with the A-phase power supply circuit, Rb is the load connected with the B-phase power supply circuit, Rc is the load connected with the C-phase power supply circuit, under the condition that a neutral point is not disconnected, the voltage which is standard AC220V is borne by two ends of each load, the loads of all phases form a complex serial-parallel connection state after the disconnection, and the loads of all phases are connected in series in a circuit which is standard AC 380V.

Fig. 2 is a state diagram of direct grounding without breaking a line at a neutral point.

Fig. 3 is a diagram showing a state in which the neutral point is disconnected, the unbalanced load causes a shift of the neutral point, the neutral point has an unbalanced potential, and the phase voltages do not match each other.

Fig. 4 is a schematic circuit diagram of an embodiment of the integrated power protection device of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 4, the integrated power protection device of the present invention includes a main circuit breaker QF, a main contactor, a three-phase power protector JS, a time delay relay, a first intermediate relay, a single-phase power protector JS', and a second intermediate relay. The main circuit breaker QF of the present embodiment is a three-stage breaker, and it is understood that in other embodiments, the main circuit breaker QF is not limited to a three-stage breaker, and for example, it may be a four-stage breaker, etc.

The main circuit breaker QF comprises three-level switches QF-1, QF-2 and QF-3 in the same working state, the main contactor comprises a coil KM-1 and three normally-open main contacts KM-2, KM-3 and KM-4, the time delay relay comprises a coil JS-1 and a normally-open contact JS-2, the first intermediate relay comprises a coil ZJ-1, a normally-closed contact ZJ-2 and a normally-open contact ZJ-3, and the second intermediate relay comprises a coil ZJ-1 ', a normally-closed contact ZJ-2 ' and a normally-open contact ZJ-3 '; the first ends of the switches QF-1, QF-2 and QF-3 of the main loop breaker QF are respectively connected with the phase A, the phase B and the phase C of a three-phase alternating current power supply side, the first ends of the normally-open main contacts KM-2, KM-3 and KM-4 of the main contactor are respectively connected with the second ends of the switches QF-1, QF-2 and QF-3 of the main loop breaker QF, the second ends of the three normally-open main contacts KM-2, KM-3 and KM-4 of the main contactor are connected with an electric load needing to be protected, and a control power supply is taken from the main breaker QF and then sent to each control loop; a coil KM-1 of the main contactor sequentially passes through a normally closed contact ZJ-2' of the second intermediate relay and a normally closed contact ZJ-2 of the first intermediate relay and then is connected with a second end of the switch QF-1 to be connected with a live wire 101 of a control power supply, and a second end of the coil KM-1 is connected with a null wire 102 of the control power supply to form a main control loop; three signal terminals L1, L2 and L3 of the three-phase power supply protector JS are respectively connected with the second ends of the three-level switches QF-1, QF-2 and QF-3 to provide detection signals for the three-phase power supply protector; a first end of a coil JS-1 of the delay relay is connected with a second end of the switch QF-1 through a normally open contact JS1 of the power protector JS so as to be connected with a control power live wire 101, and a second end of the coil JS-1 of the delay relay is connected with a zero line N of the three-phase alternating current so as to form an anti-misoperation control loop; the first end of a coil ZJ-1 of the first intermediate relay is connected with the second end of the switch QF-1 through a normally open contact JS-2 of the time delay relay, a node between the coil ZJ-1 of the first intermediate relay and the normally open contact JS-2 is also connected with a zero line N of the three-phase alternating current, the second end of the coil ZJ-1 of the first intermediate relay is connected with the zero line N of the three-phase alternating current, and the normally open contact ZJ-3 is connected with the normally open contact JS-2 in parallel to form an action self-holding loop of the first intermediate relay; the first end of a coil ZJ-1 ' of the second intermediate relay is connected with the second end of the switch QF-1 through the normally open contact ZJ-3 ', the second end of the coil ZJ-1 ' is connected with a zero line N of three-phase alternating current, 11 pins and 14 pins of the single-phase power supply protector are normally contacts and are connected with the coil ZJ-1 ' of the second intermediate relay in series to form a neutral point disconnection and phase unbalance protection loop, the normally open contact ZJ-3 ' of the second intermediate relay is connected with the normally open contact of a single-phase power supply protector JS2 in parallel to form an action holding loop of the second intermediate relay ZJ2, an A1 power supply pin of the single-phase power supply protector is connected with a control power supply live wire 101, an A2 power supply pin of the single-phase power supply protector is connected with the zero line N, a B terminal of the single-phase power supply protector JS is connected with a neutral point of a power supply area needing protection through a No. 200, and the C terminal of the single-phase power supply protector JS' is grounded to form a neutral point potential detection loop.

Further, the power integrated protection device still includes a two-stage control switch ZK, the first motionless end of two-stage control switch ZK with switch QF-1's second end is connected, first motional end with normally closed contact ZJ-2, normally open contact KT-1, normally open contact ZJ-3, normally open contact JS-2, normally open contact ZJ-3' and single phase power supply protector JS's 11 pins and A1 pins are all connected, the second motionless end with the zero line N of three-phase alternating current is connected, the second motional end is all connected with coil KM-1, delay line electric appliance's coil JS-1, first intermediate line electric appliance's coil ZJ-1, second intermediate relay's line ZJ-1 'and single phase power supply protector JS's 14 pins and A2 pins.

Furthermore, the power supply comprehensive protection device further comprises a reset normally closed switch AF1, and the first end of the coil ZJ-1 is connected with the first movable end of the single-pole double-throw switch ZK1 sequentially through the normally open contact ZJ-3 and the reset normally closed switch AF 1.

Furthermore, the power supply comprehensive protection device also comprises a reset normally closed switch AF2, wherein the first end of the coil ZJ-1 'sequentially informs the normally open contact ZJ-3' and the reset normally closed switch AF2 to be connected with the first movable end of the single-pole double-throw switch ZK 1.

Furthermore, the power supply comprehensive protection device further comprises a fault lamp HR, the main contactor is further provided with a normally-open auxiliary contact KM-5, the first end of the fault lamp HR is connected with the first movable end of the single-pole double-throw switch ZK1 through the normally-open auxiliary contact KM-5, and the second end of the fault lamp HR is connected with the second movable end of the single-pole double-throw switch ZK 1.

Furthermore, the power supply comprehensive protection device further comprises a work indicator lamp GD, wherein a first end of the work indicator lamp GD is directly connected with a first movable end of the single-pole double-throw switch ZK, and a second end of the work indicator lamp GD is directly connected with a second movable end of the single-pole double-throw switch ZK so as to be connected between the control loops 101 and 102 in series to form a power supply indication loop.

Further, the power integrated protection device still includes a fault lamp YD1, the first end of fault lamp YD1 with the coil ZJ-1 of first auxiliary relay with the nodal connection between the normally open contact JS-2, the second end with the second of single-pole double-throw switch ZK is moved the end and is connected to concatenate in between the coil first end 113 of first auxiliary relay and the control power zero line 102 to form phase sequence fault indication return circuit.

Further, the power supply integrated protection device further comprises a fault lamp YD2, the first end of the fault lamp YD2 and the 14 pins of the single-phase power supply protector JS ' are connected with the node between the coil ZJ-1 ' of the second intermediate relay, the second end is connected with the second moving end of the single-pole double-throw switch ZK, so as to be connected in series between the first end 117 of the coil ZJ-1 ' of the second intermediate relay and the control power supply zero line 102, and thus a neutral point fault indication loop is formed.

The control power supply of the power supply comprehensive protection device is taken from the main loop breaker QF and then is sent to each control loop through the switch. The second end of a coil JS of the delay relay is connected with the zero line 102 of the control power supply; forming an anti-error control loop. The first end of the coil of the first intermediate relay is connected with the control power supply 101 through the normally open contact of the time delay relay and the reset button AF1, and the second end of the coil of the first intermediate relay is connected with the zero line 102 of the control power supply, so that a phase imbalance and open-phase protection control loop is formed. And the normally open contact of the first intermediate relay is connected in parallel with the normally open contact of the delay relay to form an action self-holding loop of the first intermediate relay. Be its normally open contact between single phase power supply protector's 11 pins and 14 pins, concatenate with reset button AF2 and second intermediate relay's coil and form neutral point broken string, the unbalanced protection return circuit of looks, the normally open contact of second intermediate relay connects in parallel with single phase power supply protector JS 2's normally open contact, forms second intermediate relay's action self-sustaining return circuit. And the C terminal of the single-phase power supply protector is grounded to form a neutral point potential detection loop. The front end of the two-stage control switch is connected with a main loop breaker QF1 and a zero line N, and the rear end is connected with a control loop live wire 101 and a control loop zero line 102, so that protection is provided for the control loop. The running indicator HR is connected in series between the control loops 101 and 102 to form a running indicator loop. The work indication lamp string is connected between the control loops 101 and 102 to form a power indication loop. The fault lamp string is connected between the first end 117 of the coil of the second intermediate relay and the neutral wire 102 to form a neutral point fault indication circuit.

According to the power supply comprehensive protection device, the main circuit breaker QF is used for overcurrent and short-circuit protection, the contactor KM is connected into the main circuit and used for cutting off the main circuit to protect rear-end equipment when a system detects that a neutral point is disconnected and open-phase, and the time relay JS is used for filtering out the influence of a pulse signal on a control system. The three-phase power supply protector JS uses GF monitoring system overvoltage, undervoltage, phase failure and phase error. The No. JS' R200 terminal of the single-phase power supply monitor is connected to a neutral point of a power supply area needing protection, the other end of the single-phase power supply monitor is grounded locally, and neutral point-to-ground offset voltage is monitored so as to find and judge whether the neutral point has a disconnection fault and a serious load imbalance fault.

The working principle of the power supply comprehensive protection device of the embodiment of the invention is as follows: after the main loop QF is closed, the main contactor is automatically closed to supply power to the system. The first intermediate relay and the second intermediate relay do not operate. The three-phase power supply protector JS and the single-phase power supply protector JS' are powered on to be monitored and detected. If the system has one of the faults of phase loss, phase sequence error, overvoltage or undervoltage and the like, the three-phase power supply protector JS detects the back action, the normally open contact KT-1 of the power supply protector is closed, the 109 loop is electrified, the delay relay is triggered, the time is delayed for a certain time to avoid the influence of pulse signals, and the misoperation caused by the short-time fault or fluctuation of the power grid is avoided. If the fault is still existed after a certain time, namely the normally open contact JS-2 is closed, the coil ZJ-1 of the first intermediate relay is electrified, the normally open contact ZJ-3 is closed, the coil ZJ-1 of the first intermediate relay is electrified all the time, the normally closed contact ZJ-2 is disconnected, the main contactor is disconnected, the line 101-105 is disconnected, the main contactor is caused to jump off and cut off a main loop, and the rear-end equipment is protected.

According to the national standard, the neutral point does not allow voltage deviation exceeding 25%, and in a normal system, because the neutral point on the transformer side is directly grounded, the potential of the neutral point on the user side is the product of the current of the neutral point and the resistance of a zero line, generally not exceeding 30V, and maximally not exceeding 55V, if the front end is subjected to system neutral disconnection, a back end loop can cause the potential of the neutral point to be deviated due to different equipment in use of each loop and inconsistent total impedance, or when the loop is heavily unbalanced, the neutral point on the load side is excessively deviated. When the neutral point offset voltage under the two conditions exceeds the offset value which cannot be generated when the system is normal (the set value can be adjusted according to the protection requirement of the system), namely the neutral point at the front end is broken or the load of a system loop is seriously unbalanced, the single-phase power supply protector JS ' is closed, so that the coil ZJ-1 ' of the second intermediate relay acts, the normally closed contact ZJ-2 ' is tripped (even if the lines 105 and 107 are tripped), and the main contactor is tripped to cut off the main loop, so as to protect the rear-end equipment.

After the fault occurs, the fault type is indicated through a fault lamp YD1 and a fault lamp YD2 and is kept until the fault is manually processed, and after the fault is eliminated, the fault is reset through a reset normally-closed switch AF1 and a reset normally-closed switch AF2, or the system is reset through power failure. In conclusion, the invention realizes the comprehensive power protection of short circuit, overload, overvoltage, undervoltage, open-phase and wrong-phase, neutral point disconnection and serious unbalance of a system loop of the fragile electric equipment, and eliminates the damage of the factors to the equipment.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.