阅读说明：本技术 一种电流自动切换装置和高压电能计量设备检验装置 (Current automatic switching device and high-voltage electric energy metering equipment inspection device ) 是由 赖荣光 高翔 马正德 邱泽鹏 吴保锦 谭武汉 欧阳昊 于 2021-08-10 设计创作，主要内容包括：本发明公开了一种电流自动切换装置和高压电能计量设备检验装置,通过上位机根据目标电流选择高压升压器和高压电流互感器的量程开关,下发带有量程开关编址信息的信号给一次电流切换控制器和二次电流切换控制器,使得一次电流切换控制器和二次电流切换控制器对接收到的带有量程开关编址信息的信号进行解析,控制对应的电机式继电器的闭合或断开,实现了电流自动切换,避免了人为因素带来的检验误差,提高了自动化水平；采用电机式继电器的开关闭合与断开完成电流换档,换档时间在3～6秒之间,提升了电流切换的效率,电机式继电器依靠电机和齿轮驱动保持开关触点的开合,避免了机械磨损问题,提高了可靠性,也提高了电流切换的自动化水平。(The invention discloses a current automatic switching device and a high-voltage electric energy metering equipment inspection device.A range switch of a high-voltage booster and a high-voltage current transformer is selected by an upper computer according to target current, and a signal with range switch addressing information is sent to a primary current switching controller and a secondary current switching controller, so that the primary current switching controller and the secondary current switching controller analyze the received signal with range switch addressing information and control the closing or opening of a corresponding motor type relay, thereby realizing the automatic switching of the current, avoiding inspection errors caused by human factors and improving the automation level; the current gear shifting is completed by closing and opening the switch of the motor type relay, the gear shifting time is 3-6 seconds, the current switching efficiency is improved, the motor type relay keeps the switch contacts to be opened and closed by means of driving of the motor and the gear, the mechanical abrasion problem is avoided, the reliability is improved, and the automation level of current switching is also improved.)

1. A current automatic switching device is characterized by comprising a high-voltage side power supply, a primary current switching controller, a primary current switching relay module, a high-voltage current booster, a high-voltage current transformer, a secondary current switching controller, a low-voltage side power supply and an upper computer;

the high-voltage side power supply is connected with the primary current switching controller, the primary current switching controller is connected with the primary current switching relay module, the primary current switching relay module is respectively connected with the high-voltage current booster and the high-voltage current transformer, the high-voltage current transformer is connected with the secondary current switching controller, the secondary current switching controller is connected with the low-voltage side power supply, and the upper part of the secondary current switching controller is respectively connected with the primary current switching controller and the secondary current switching controller;

the primary current switching relay module comprises a plurality of motor type relays connected in parallel, and the secondary current switching controller is connected with the secondary side of the high-voltage current transformer through a single relay arranged inside;

the primary current switching controller is used for controlling the primary side of the high-voltage current booster and the primary side of the high-voltage current transformer to be connected with a primary current switching relay module in series to form a primary current loop;

the secondary current switching controller is used for controlling a single relay inside to be connected with the high-voltage current transformer in series to form a secondary current loop;

the upper computer is used for selecting the range switches of the high-voltage booster and the high-voltage current transformer according to the target current, and sending signals with range switch addressing information to the primary current switching controller and the secondary current switching controller in a wireless communication mode, so that the primary current switching controller and the secondary current switching controller analyze the received signals with the range switch addressing information and control the corresponding motor type relay to be switched on or switched off.

2. The automatic current switching device according to claim 1, wherein the motor-type relay includes three input terminals, three output terminals, two relay motor coil control terminals, and two relay switch state detection terminals, the three input terminals being connected in parallel, and the three output terminals being connected in parallel.

3. The automatic current switching device according to claim 2, wherein the single-contact current capacity of the motor relay is 100A.

4. The automatic current switching device according to claim 1, wherein the high-side power supply is a multi-stage isolation transformer encapsulated in silica gel.

5. The automatic current switching device according to claim 4, wherein the high-side power supply comprises three same-transformation-ratio isolation transformers and one step-down-ratio isolation transformer, and the three same-transformation-ratio isolation transformers are connected in series and then connected in series with the step-down-ratio isolation transformer.

6. The automatic current switching device according to claim 5, wherein each isolation transformer of the high-side power supply has a withstand voltage class of 10 kV.

7. The automatic current switching device according to claim 1, wherein the relay inside the secondary current switching controller is a solid state relay.

8. The automatic current switching device according to claim 1, further comprising an alarm device;

the alarm device is connected with the high-voltage side power supply, the primary current switching controller and the upper computer;

the alarm device is used for sending an alarm signal when the upper computer detects that the switching state and the control state of the motor type relay are inconsistent.

9. The automatic current switching device according to claim 1, wherein the connection mode of the upper computer with the primary current switching controller and the secondary current switching controller is micro-power wireless connection, Bluetooth connection or ZigBee connection.

10. A high-voltage electric energy metering device checking apparatus, characterized by comprising the automatic current switching apparatus according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of current switching equipment, in particular to an automatic current switching device and a high-voltage electric energy metering equipment inspection device.

Background

When the inspection device performs performance test and error detection of electric energy metering on the high-voltage electric energy metering equipment, a certain given voltage and different current magnitudes need to be output, such as 5A, 20A, 100A, 200A, 400A and the like, namely, the voltage does not need to be replaced, but the current needs to be switched into different gears on corresponding ranges of the high-voltage current booster and the high-voltage current transformer, namely, current switching.

The high-voltage electric energy metering equipment comprises a traditional high-voltage electric energy metering cabinet (box), a novel integrated high-voltage electric energy meter, intelligent high-voltage switch equipment (with an electric energy metering function) and other devices for metering high-voltage electric energy, and has the functions of measuring and metering electric energy such as positive/negative reactive power of variables such as voltage, current, power factors and the like. The high-voltage electric energy metering equipment has the electric energy precision of the integral error of 0.5S grade, and the integral electric energy error of the high-voltage electric energy metering equipment inspection device is checked. The calibrating device has the capability of outputting high voltage and large current, the voltage output range is 6-35 kV, the current output range is 0-600A, and the common gears are 600A, 250A, 80A, 40A, 20A and 7.5A. The current loop adopts a high-voltage current booster and the input and output of a high-voltage current transformer which comprise a plurality of gears with different current measuring ranges, and in order to test and verify high-voltage electric energy metering equipment with different current specifications, the current loop needs to output voltage meeting the testing regulations and currents with different intensities, including amplitude, phase and frequency. The output of the current magnitude depends on changing the gear wiring of the high-voltage current booster or the high-voltage current transformer so as to output a current value meeting the precision requirement. The current switching of the traditional high-voltage electric energy metering equipment inspection device is to perform manual gear shifting in the state that the inspection device is stopped and powered off, and an operator manually changes gear wiring of currents with different ranges of the high-voltage current booster and the high-voltage current transformer, so that the current switching efficiency is low, and the verification error is easily influenced by human factors (misconnection and virtual connection); the existing mode for realizing current automatic gear shifting is that a sliding block on a screw rod is driven to move forwards and backwards by the rotation of a motor, a moving contact arranged on the sliding block is contacted with a fixed contact of a certain current gear fixed in the device, so that the current automatic gear shifting is carried out in a state that the inspection device is not stopped, but the mode of relying on mechanical transmission is used for realizing automatic switching of the current gear, the speed is low, the gear shifting time is 10-30 seconds, a transmission mechanism is easy to wear after long-term operation, the service life is influenced, and the surface oxidation of a moving contact and a static contact can increase contact resistance and cause the impedance deviation of a current loop. Therefore, how to improve the efficiency, reliability and automation level of the automatic current switching of the high-voltage electric energy metering device inspection apparatus is a technical problem to be solved urgently by those skilled in the art.

Disclosure of Invention

The invention provides an automatic current switching device and a high-voltage electric energy metering equipment inspection device, which are used for improving the efficiency, reliability and automation level of automatic current switching of the high-voltage electric energy metering equipment inspection device.

In view of this, the first aspect of the present invention provides an automatic current switching device, which includes a high-voltage side power supply, a primary current switching controller, a primary current switching relay module, a high-voltage current booster, a high-voltage current transformer, a secondary current switching controller, a low-voltage side power supply, and an upper computer;

the high-voltage side power supply is connected with the primary current switching controller, the primary current switching controller is connected with the primary current switching relay module, the primary current switching relay module is respectively connected with the high-voltage current booster and the high-voltage current transformer, the high-voltage current transformer is connected with the secondary current switching controller, the secondary current switching controller is connected with the low-voltage side power supply, and the upper part of the secondary current switching controller is respectively connected with the primary current switching controller and the secondary current switching controller;

the primary current switching relay module comprises a plurality of motor type relays connected in parallel, and the secondary current switching controller is connected with the high-voltage current transformer through a single relay arranged inside;

the primary current switching controller is used for controlling the primary side of the high-voltage current booster and the primary side of the high-voltage current transformer to be connected with a primary current switching relay module in series to form a primary current loop;

the secondary current switching controller is used for controlling a single relay inside to be connected with the high-voltage current transformer in series to form a secondary current loop;

the upper computer is used for selecting the range switches of the high-voltage booster and the high-voltage current transformer according to the target current, and sending signals with range switch addressing information to the primary current switching controller and the secondary current switching controller in a wireless communication mode, so that the primary current switching controller and the secondary current switching controller analyze the received signals with the range switch addressing information and control the closing of the corresponding motor type relays.

Optionally, the motor-type relay includes three input terminals, three output terminals, two relay motor coil control terminals, and two relay switch state detection terminals, the three input terminals being connected in parallel, and the three output terminals being connected in parallel.

Alternatively, the single contact current capacity of the electromechanical relay is 100A.

Optionally, the high-voltage side power supply is a silica gel encapsulated multistage isolation transformer.

Optionally, the high-voltage side power supply includes three same-transformation-ratio isolation transformers and one step-down-ratio isolation transformer, and the three same-transformation-ratio isolation transformers are connected in series and then connected in series with the step-down-ratio isolation transformer.

Optionally, each isolation transformer of the high side power supply has a withstand voltage rating of 10 kV.

Optionally, the relay inside the secondary current switching controller is a solid state relay.

Optionally, the device further comprises an alarm device;

the alarm device is connected with the high-voltage side power supply, the primary current switching controller and the upper computer;

the alarm device is used for sending an alarm signal when the upper computer detects that the switching state and the control state of the motor type relay are inconsistent.

Optionally, the connection mode of the upper computer and the primary current switching controller and the secondary current switching controller is micro-power wireless connection, bluetooth connection or ZigBee connection.

The invention provides a high-voltage electric energy metering equipment checking device in a second aspect, which comprises any one of the automatic current switching devices in the first aspect.

According to the technical scheme, the embodiment of the invention has the following advantages:

the invention provides an automatic current switching device which comprises a high-voltage side power supply, a primary current switching controller, a primary current switching relay module, a high-voltage current booster, a high-voltage current transformer, a secondary current switching controller, a low-voltage side power supply and an upper computer, wherein the high-voltage side power supply is connected with the primary current switching controller; the high-voltage side power supply is connected with the primary current switching controller, the primary current switching controller is connected with the primary current switching relay module, the primary current switching relay module is respectively connected with the high-voltage current booster and the high-voltage current transformer, the high-voltage current transformer is connected with the secondary current switching controller, the secondary current switching controller is connected with the low-voltage side power supply, and the upper part of the secondary current switching controller is respectively connected with the primary current switching controller and the secondary current switching controller; the primary current switching relay module comprises a plurality of motor type relays connected in parallel, and the secondary current switching controller is connected with the high-voltage current transformer through a single relay arranged inside; the primary current switching controller is used for controlling the primary side of the high-voltage current booster and the primary side of the high-voltage current transformer to be connected with a primary current switching relay module in series to form a primary current loop; the secondary current switching controller is used for controlling a single relay inside to be connected with the high-voltage current transformer in series to form a secondary current loop; the upper computer is used for selecting the range switches of the high-voltage booster and the high-voltage current transformer according to the target current, and sending signals with range switch addressing information to the primary current switching controller and the secondary current switching controller in a wireless communication mode, so that the primary current switching controller and the secondary current switching controller analyze the received signals with the range switch addressing information and control the closing of the corresponding motor type relays. According to the high-voltage electric energy metering equipment inspection device, the upper computer selects the range switches of the high-voltage booster and the high-voltage current transformer according to the target current, and sends signals with range switch addressing information to the primary current switching controller and the secondary current switching controller, so that the primary current switching controller and the secondary current switching controller analyze the received signals with range switch addressing information and control the closing of the corresponding motor type relays, the automatic current switching is realized, the inspection error caused by human factors is avoided, and the automation level is improved; the current gear shifting is completed by adopting the on-off of the switch of the motor type relay, the gear shifting time is 3-6 seconds, the current switching efficiency is improved, the motor type relay keeps the on-off of the switch contact by means of the driving of the motor and the gear, and outputs a switch state detection signal, so that the reading of a current switching controller at one time is facilitated, the on-off or the on-off of the switch is ensured, the open circuit of a current loop is ensured, the mechanical abrasion problem is avoided, the reliability is improved, and the automation level of the current switching is also improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other related drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a block diagram illustrating an operation principle of a high voltage electric energy metering device inspection apparatus provided in an embodiment of the present invention;

fig. 2 is a current switching electrical schematic diagram of a primary current switching controller of the inspection apparatus for high-voltage electric energy metering device provided in the embodiment of the present invention;

fig. 3 is a schematic structural diagram of a motor-type relay provided in the embodiment of the present invention;

FIG. 4 is a schematic diagram of a high-side power supply according to an embodiment of the present invention;

fig. 5 is a schematic diagram of the structure of the high-voltage current booster and the number of the range switch provided in the embodiment of the present invention;

fig. 6 is a schematic diagram of a structure of a high-voltage current transformer and a number of a range switch provided in an embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, 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.

For easy understanding, please refer to fig. 1 and 2, the present invention provides an embodiment of an automatic current switching apparatus, which includes a high-voltage side power supply, a primary current switching controller, a primary current switching relay module, a high-voltage current booster, a high-voltage current transformer, a secondary current switching controller, a low-voltage side power supply, and an upper computer;

the high-voltage side power supply is connected with the primary current switching controller, the primary current switching controller is connected with the primary current switching relay module, the primary current switching relay module is respectively connected with the high-voltage current booster and the high-voltage current transformer, the high-voltage current transformer is connected with the secondary current switching controller, the secondary current switching controller is connected with the low-voltage side power supply, and the upper part of the secondary current switching controller is respectively connected with the primary current switching controller and the secondary current switching controller;

the primary current switching relay module comprises a plurality of motor type relays connected in parallel, and the secondary current switching controller is connected with the secondary side of the high-voltage current transformer through a single relay arranged inside;

the primary current switching controller is used for controlling the primary side of the high-voltage current booster and the primary side of the high-voltage current transformer to be connected with a primary current switching relay module in series to form a primary current loop;

the secondary current switching controller is used for controlling a single relay inside to be connected with the high-voltage current transformer in series to form a secondary current loop;

the upper computer is used for selecting the range switches of the high-voltage booster and the high-voltage current transformer according to the target current, and sending signals with range switch addressing information to the primary current switching controller and the secondary current switching controller in a wireless communication mode, so that the primary current switching controller and the secondary current switching controller analyze the received signals with the range switch addressing information and control the corresponding motor type relay to be switched on or switched off.

It should be noted that, the range switches of the high voltage current booster and the high voltage current transformer are both provided with range switch numbers, the upper computer is provided with meter checking software, when a certain current load point is checked, the meter checking software selects the range switch numbers of the high voltage current booster and the high voltage current transformer according to the target current, the meter checking software can be in micro-power wireless (470-510 MHz) connection or Bluetooth connection (2.4GHz) or ZigBee connection (2.4GHz) through wireless communication mode, sends signals to the primary current switching controller and the secondary current switching controller with different addressing, namely, the meter checking software sends signals with range switch addressing information (including the number of the primary side relay of the high voltage current booster, the number of the primary side relay of the high voltage current transformer, and the number of the secondary side relay of the high voltage current transformer) to the primary current switching controller and the secondary current switching controller through the upper computer, the primary current switching controller and the secondary current switching controller analyze the received signals with the range switch addressing information, control the corresponding motor type relays to be closed, and enable other motor type relays to be in an open state. The structure of the high-voltage current booster and the number of the range switch are schematically shown in fig. 5, the structure of the high-voltage current transformer and the number of the range switch are schematically shown in fig. 6, the relationship between the current range and the wiring of the high-voltage current booster is shown in table 1, and the relationship between the actual output range and the gear of the high-voltage current transformer is shown in table 2.

TABLE 1

TABLE 2

In a current loop of the calibrating device, a motor type relay is adopted, and the on/off of an internal switch of the calibrating device is controlled by a program, so that the current gear of the high-voltage current booster or the high-voltage current transformer is automatically switched, the automatic switching of current and the continuous operation of equipment in the calibrating process are met, and the safety and the timeliness of the calibrating process are improved. Specifically, the small current output by the three-phase low-voltage programmable power source is subjected to current rise of the current booster and feedback of the current transformer, high voltage and large current are output to the detected equipment by means of current range gear shifting, and the output current is fed back to the three-phase low-voltage standard electric energy meter, so that a complete current switching process is realized.

According to the automatic current switching device provided by the embodiment of the invention, the upper computer selects the range switches of the high-voltage booster and the high-voltage current transformer according to the target current and sends the signals with the range switch addressing information to the primary current switching controller and the secondary current switching controller, so that the primary current switching controller and the secondary current switching controller analyze the received signals with the range switch addressing information and control the closing of the corresponding motor type relays, the automatic current switching is realized, the inspection errors caused by artificial factors (misconnection and virtual connection) due to manual range wiring replacement are avoided, the labor intensity of operators is reduced, and the automation level and the safety of the inspection process are improved; the current gear shifting is completed by adopting the on-off of the switch of the motor type relay, the gear shifting time is 3-6 seconds, the current switching efficiency is improved, the motor type relay keeps the on-off of the switch contact by means of the driving of the motor and the gear, and outputs a switch state detection signal, so that the reading of a current switching controller at one time is facilitated, the on-off or the on-off of the switch is ensured, the open circuit of a current loop is ensured, the mechanical abrasion problem is avoided, the reliability is improved, and the automation level of the current switching is also improved.

In one embodiment, the motor relay structure is as shown in fig. 3, and includes three input terminals (2101, 2102, 2103), three output terminals (2201, 2202, 2203), two relay motor coil control terminals (2301, 2302) and two relay switch state detection terminals (2303, 2304), where the three input terminals are connected in parallel and the three output terminals are connected in parallel. When the motor type relay is installed, a copper bar on the input side and the output side of a primary side current is processed into a half-square shape and is processed with an installation hole, the input ends (2101, 2102 and 2103) of the relay are fixed on the copper bar through nuts, bolts and elastic gaskets, the output ends (2201, 2202 and 2203) of the relay are connected to a primary side gear terminal of a high-voltage current booster or a high-voltage current transformer through a copper wire, the wiring of a current loop is guaranteed to be firm and reliable, and the anti-vibration capability is improved. The capacity of a single contact of the motor type relay is 100A, three input ends are connected in parallel, three output ends are connected in parallel, the capacity of the contact of the relay is 300A, when more relays are required to be connected in parallel to achieve large-current output, for example, a 600A current gear is required, 6 relays are required to be connected in parallel according to the prior art, the relay can be achieved only by connecting 2 relays in parallel, and therefore large-current output can be achieved by connecting fewer relays in parallel. The relay inside the secondary current switching controller can be a common solid state relay with a contact capacity of 10A.

In one embodiment, the high side power supply is a silica gel potted multi-stage isolation transformer. The high-voltage area of the current switching part of the existing high-voltage electric energy metering equipment inspection device adopts a lithium battery as a power supply of a primary current controller, the lithium battery needs to be charged and controlled, the current switching work can be carried out only when the electric quantity of the battery is enough, and the reliability is lower. In the invention, the high-voltage side power supply of the high-voltage area adopts the multilevel isolation transformer encapsulated by silica gel, the battery charging management is not needed, the normal work of the primary current switching controller can be ensured by directly connecting 220V alternating current, and the power supply reliability is high. The single isolation transformer of the multi-stage isolation transformer encapsulated by silica gel has the voltage-resistant grade of 10kV, 3 220/220V isolation transformers with three-stage same transformation ratio output are adopted and connected in series, 1 220/12V step-down ratio isolation transformer is connected in series, 4 isolation transformers are placed in a power box consisting of epoxy boards, and the multi-stage isolation transformer encapsulated by the silica gel is encapsulated in a full-sealed manner by adopting the insulating silica gel, has the overall voltage-resistant grade of 35kV, has good insulating property, and protects internal voltage conversion from electromagnetic interference of high voltage and heavy current, and is shown in a structural diagram in figure 4 (in figure 4, 31 is a power input end, 32 is an isolation transformer, 33 is silica gel, and 34 is a power output end 35 is a power box). The secondary current switching controller works on the lower-voltage side of the calibrating device and is powered by a low-voltage side power supply, wherein the low-voltage side power supply can be selected from a common power supply converter, 220V of alternating current is input, and 12V of alternating current is output. A multistage isolation power supply encapsulated by silica gel is adopted in a high-voltage area of the current automatic switching device to supply power to the primary side current switching controller, so that the instability of power supply caused by battery power supply is avoided, and the reliability and continuity of power supply are improved.

In one embodiment, the automatic current switching device is further provided with an alarm device, the alarm device is connected with the high-voltage side power supply, the primary current switching controller and the upper computer, and the alarm device is used for sending an alarm signal when the upper computer detects that the switching state and the control state of the motor type relay are inconsistent. And an alarm device is added in the primary current loop, on one hand, the alarm device acquires a relay range switch number signal sent by an upper computer, on the other hand, the alarm device acquires switch state information acquired from a relay switch state detection end through a primary current switching controller, and when any switch state of the relay is detected to be inconsistent with a control state, the alarm device is triggered. The alarm mode may be a buzzer alarm (for example, the buzzer sounds at 200ms intervals to remind an operator to stop the machine and check hardware faults), an audible and visual alarm or a voice alarm, and may not be limited specifically.

The invention also provides an embodiment of the high-voltage electric energy metering equipment inspection device, which comprises any one of the current automatic switching devices in the embodiments of the current automatic switching devices, when the high-voltage electric energy metering equipment inspection device is used, the upper computer selects the range switches of the high-voltage booster and the high-voltage current transformer according to target current, and sends signals with range switch addressing information to the primary current switching controller and the secondary current switching controller, so that the primary current switching controller and the secondary current switching controller analyze the received signals with the range switch addressing information and control the closing of corresponding motor type relays, thereby realizing the automatic current switching, avoiding inspection errors caused by artificial factors (misconnection and virtual connection) due to manual range wiring replacement, the labor intensity of operators is reduced, and the automation level and the safety of the inspection process are improved; the current gear shifting is completed by adopting the on-off of the switch of the motor type relay, the gear shifting time is 3-6 seconds, the current switching efficiency is improved, the motor type relay keeps the on-off of the switch contact by means of the driving of the motor and the gear, and outputs a switch state detection signal, so that the reading of a current switching controller at one time is facilitated, the on-off or the on-off of the switch is ensured, the open circuit of a current loop is ensured, the mechanical abrasion problem is avoided, the reliability is improved, and the automation level of the current switching is also improved. The current automatic switching device has all the technical effects of the current automatic switching device, and the details are not repeated herein.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.