CN219268734U - Power failure test power supply device for switch cabinet - Google Patents
Power failure test power supply device for switch cabinet Download PDFInfo
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- CN219268734U CN219268734U CN202320823661.9U CN202320823661U CN219268734U CN 219268734 U CN219268734 U CN 219268734U CN 202320823661 U CN202320823661 U CN 202320823661U CN 219268734 U CN219268734 U CN 219268734U
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Abstract
The utility model discloses a power failure test power supply device of a switch cabinet, which can output smooth and adjustable direct-current voltage after series operations such as filtering, rectifying, inverting and secondary rectifying of an input alternating-current power supply in a remote control mode, and directly provide an unlocking power supply for a locking relay of the switch cabinet or provide an energy storage power supply for a motor of a circuit breaker. According to the utility model, the testing procedures of hurting people by a mechanism such as dismantling a mechanism panel of the circuit breaker or manually storing energy for the circuit breaker mechanism and the like are omitted, and the efficiency is low, so that the safety risk in the testing process is greatly reduced, the testing efficiency is improved, and the power failure time of a user is reduced.
Description
Technical Field
The utility model relates to the technical field of power equipment detection, in particular to a power supply device for a power failure test of a switch cabinet.
Background
The main function of the switch cabinet is to open and close, control and protect electric equipment in the process of generating, transmitting, distributing and converting electric energy of the electric power system. In order to ensure the normal operation of the switch cabinet, a tester usually needs to perform routine power failure tests on the switch cabinet, such as a bus alternating current voltage withstand test, a loop resistance of a circuit breaker, a mechanical characteristic test and the like. However, the power failure test of the switch cabinet can directly cause interruption of power supply of a user, so that the power failure test of the switch cabinet usually has stricter time limit, and the test efficiency must be improved as much as possible in consideration of the tight working time and large workload.
Because of the "five-protection" function design of the switchgear, latching relays with specific functions, such as latching relays for switching in and out of a handcart, latching relays for switching on a circuit breaker, and the like, are usually configured in the switchgear. When the switch cabinet is subjected to power failure test, the latching relays are usually in a power failure state, namely in a latching state, so that a tester cannot pull out or push in the handcart of the circuit breaker, and the circuit breaker cannot perform operations such as closing. At this time, the conventional method is to disassemble the mechanism panel of the circuit breaker manually by using a tool, then find the corresponding latching relay, forcibly suck the latching relay by a manual mode to release the latching, and restore the latching relay and the mechanism panel after the test is completed. However, this method has a number of disadvantages: firstly, the mechanism panel of the circuit breaker needs to be repeatedly removed and restored, which is time-consuming and labor-consuming and extremely low in efficiency; secondly, when the manual unlocking, the test personnel are too close to the energy storage spring mechanism, and once the operation is improper, the mechanical injury is easy to cause, and the operation risk is very high. In addition, when the mechanical characteristic test is carried out on the circuit breaker, the mechanism of the circuit breaker is required to be subjected to repeated energy storage, but the circuit breaker is positioned at a 'maintenance' position during the test, an energy storage power supply is not connected, energy storage can be carried out only through a manual mode, and the working efficiency of the manual energy storage mode is low.
In summary, there is a need for a power supply device for unlocking a latching relay of a switchgear and storing energy of a motor of a circuit breaker, which can unlock the latching relay of the switchgear and store energy of the circuit breaker in an electric manner during a switchgear routine test, thereby improving test efficiency, reducing test risk, and reducing power failure time of a user.
Disclosure of Invention
The utility model aims to provide a power supply device for a power failure test of a switch cabinet, which solves the problems existing in the prior art.
The utility model is realized by the following technical scheme:
the power supply device for the power failure test of the switch cabinet comprises an input filtering module, a first rectifying and filtering module, an inversion module, an output rectifying and filtering module, an output module, a control module, a communication module and a remote control terminal;
the input end of the input filtering module is connected with external alternating current, the output end of the input filtering module is connected with the input end of the first rectifying and filtering module, the output end of the first rectifying and filtering module is connected with the input end of the inversion module, the output end of the inversion module is connected with the input end of the output rectifying and filtering module, the output end of the output module is connected with the locking power end of the locking relay of the switch cabinet and the power end of the motor of the circuit breaker respectively, a first data interaction pin of the control module is connected with the controlled end of the inversion module, a second data interaction pin of the control module is connected with the controlled end of the output module, a third data interaction pin of the control module is connected with a fourth data interaction pin of the communication module, and the communication module is in wireless communication connection with the remote control terminal.
In one possible implementation, the input filtering module includes a capacitor C1, an inductor L1, and an inductor L2;
the two ends of the capacitor C1 are jointly used as an input end of the input filter module, the two ends of the capacitor C1 are respectively connected with one end of the inductor L1 and one end of the inductor L2, and the other end of the inductor L1 and the other end of the inductor L2 are jointly used as an output end of the input filter module;
at least one capacitor branch and at least one resistor branch are arranged between the other end of the inductor L1 and the other end of the inductor L2, the capacitor branch comprises at least one series capacitor, and the resistor branch comprises at least one series resistor.
In one possible embodiment, the first rectifying and filtering module is provided as a bridge rectifier U3;
the two output ends of the bridge rectifier U3 are used as the input ends of the first rectifying and filtering module together, and the two output ends of the bridge rectifier U3 are used as the output ends of the first rectifying and filtering module together; at least one filtering branch circuit is arranged between two output ends of the bridge rectifier U3, and the filtering branch circuit comprises at least one series capacitor.
In one possible embodiment, the inverter module includes a full-bridge inverter U3 and a transformer T1;
the full-bridge inverter U3 comprises a first switching tube, a second switching tube, a third switching tube and a fourth switching tube, wherein the drain electrode of the first switching tube and the source electrode of the second switching tube are jointly used as the input end of the inversion module, the drain electrode of the first switching tube is connected with the drain electrode of the third switching tube, the source electrode of the second switching tube is connected with the source electrode of the fourth switching tube, the source electrode of the first switching tube is respectively connected with the drain electrode of the second switching tube and one end of the primary side of the transformer T1, the source electrode of the third switching tube is respectively connected with the drain electrode of the fourth switching tube and the other end of the primary side of the transformer T1, and the two ends of the secondary side of the transformer T1 are jointly used as the output end of the inversion module, and the grid electrodes of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are jointly used as the controlled end of the inversion module.
In one possible embodiment, the output rectifying and filtering module is configured as an LC filter circuit.
In one possible implementation, the output module includes a plurality of electromagnetic switches, an execution end of each electromagnetic switch connects an output end of the output module with a latching power end of the switch cabinet latching relay or connects an output end of the output module with a power end of the circuit breaker motor, and a controlled end of each electromagnetic switch is controlled by the control module.
In a possible implementation manner, the control module adopts a singlechip with the model of STM8L151C8T6 as a control chip U1, four first GPIO pins of the control chip U1 are used as first data interaction pins, and the four first GPIO pins are respectively connected with gates of a first switching tube, a second switching tube, a third switching tube and a fourth switching tube;
and a plurality of second GPIO pins of the control chip U1 are used as second data interaction pins, and each second GPIO pin is connected with a controlled end of one electromagnetic switch.
In one possible embodiment, the control chip U1 is provided with a minimum system.
In one possible implementation manner, the communication module includes a transceiver chip U2 with a model number of a7139, a data transmission interface of the transceiver chip U2 is connected to a third GPIO pin of the control chip U1, and the transceiver chip U2 is connected to a remote control terminal in a wireless communication manner.
Compared with the prior art, the utility model has the following advantages and beneficial effects:
(1) According to the power failure test power supply device for the switch cabinet, disclosed by the utility model, a smooth direct-current voltage with adjustable size can be output after a series of operations such as filtering, rectifying, inverting and re-rectifying of an input alternating-current power supply are performed in a remote control mode, so that an unlocking power supply is directly provided for a locking relay of the switch cabinet, or an energy storage power supply is provided for a motor of a circuit breaker.
(2) According to the utility model, the testing procedures of hurting people by a mechanism such as dismantling a mechanism panel of the circuit breaker or manually storing energy for the circuit breaker mechanism and the like are omitted, and the efficiency is low, so that the safety risk in the testing process is greatly reduced, the testing efficiency is improved, and the power failure time of a user is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the utility model and are incorporated in and constitute a part of this application, illustrate embodiments of the utility model.
Fig. 1 is a schematic structural diagram of a power supply device for a power failure test of a switch cabinet according to an embodiment of the present utility model.
Fig. 2 is a circuit diagram of an input filter module according to an embodiment of the present utility model.
Fig. 3 is a circuit diagram of a first rectifying and filtering module according to an embodiment of the present utility model.
Fig. 4 is a circuit diagram of an inverter module according to an embodiment of the present utility model.
Fig. 5 is a circuit diagram of an output rectifying and filtering module according to an embodiment of the present utility model.
Fig. 6 is a circuit diagram of an output module according to an embodiment of the present utility model.
Fig. 7 is a circuit diagram of a control module according to an embodiment of the present utility model.
Fig. 8 is a circuit diagram of a communication module according to an embodiment of the present utility model.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present utility model, the present utility model will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present utility model and the descriptions thereof are for illustrating the present utility model only and are not to be construed as limiting the present utility model.
Example 1
As shown in fig. 1, an embodiment of the present utility model provides a power supply device for a power failure test of a switch cabinet, including an input filtering module, a first rectifying and filtering module, an inversion module, an output rectifying and filtering module, an output module, a control module, a communication module and a remote control terminal; the input end of the input filtering module is connected with external alternating current, the output end of the input filtering module is connected with the input end of the first rectifying and filtering module, the output end of the first rectifying and filtering module is connected with the input end of the inversion module, the output end of the inversion module is connected with the input end of the output rectifying and filtering module, the output end of the output rectifying and filtering module is connected with the locking power end of the locking relay of the switch cabinet and the power end of the motor of the circuit breaker respectively, the first data interaction pin of the control module is connected with the controlled end of the inversion module, the second data interaction pin of the control module is connected with the controlled end of the output module, the third data interaction pin of the control module is connected with the fourth data interaction pin of the communication module, and the communication module is in wireless communication connection with the remote control terminal.
As shown in fig. 2, the input filter module includes a capacitor C1, an inductor L1, and an inductor L2; the two ends of the capacitor C1 are jointly used as the input end of the input filter module, the two ends of the capacitor C1 are respectively connected with one end of the inductor L1 and one end of the inductor L2, and the other end of the inductor L1 and the other end of the inductor L2 are jointly used as the output end of the input filter module; at least one capacitance branch and at least one resistance branch are arranged between the other end of the inductor L1 and the other end of the inductor L2, the capacitance branch comprises at least one series capacitance, and the resistance branch comprises at least one series resistance.
Electromagnetic noise and clutter signals of an input alternating current power supply can be suppressed through the filtering module, power supply interference is prevented, and high-frequency clutter generated by the power supply is prevented from interfering a power grid.
Optionally, two capacitance branches and a resistance branch are arranged between the other end of the inductance L1 and the other end of the inductance L2, wherein one capacitance branch comprises a capacitance C2 and a capacitance C3 which are connected in series, the other capacitance branch comprises a capacitance C4, and the resistance branch comprises a resistance R1 and a resistance R2 which are connected in series.
As shown in fig. 3, the first rectifying and filtering module is configured as a bridge rectifier U3; the two output ends of the bridge rectifier U3 are jointly used as the input end of the first rectifying and filtering module, and the two output ends of the bridge rectifier U3 are jointly used as the output end of the first rectifying and filtering module; at least one filtering branch is arranged between two output ends of the bridge rectifier U3, and the filtering branch comprises at least one series capacitor.
The alternating voltage is rectified into direct voltage by the first rectifying and filtering module, and then the direct voltage is obtained through the filtering circuit.
Optionally, two filtering branches are disposed between two output ends of the bridge rectifier U3, where one filtering branch includes a capacitor C5 and the other filtering branch includes a capacitor C6.
As shown in fig. 4, the inverter module includes a full-bridge inverter U3 and a transformer T1; the full-bridge inverter U3 comprises a first switching tube Q1, a second switching tube Q2, a third switching tube Q3 and a fourth switching tube Q4, wherein the drain electrode of the first switching tube Q1 and the source electrode of the second switching tube Q2 are jointly used as the input end of an inversion module, the drain electrode of the first switching tube Q1 is connected with the drain electrode of the third switching tube Q3, the source electrode of the second switching tube Q2 is connected with the source electrode of the fourth switching tube Q4, the source electrode of the first switching tube Q1 is respectively connected with the drain electrode of the second switching tube Q2 and one end of the primary side of a transformer T1, the source electrode of the third switching tube Q3 is respectively connected with the drain electrode of the fourth switching tube Q4 and the other end of the primary side of the transformer T1, the two ends of the secondary side of the transformer T1 are jointly used as the output ends of the inversion module, and the grid electrodes of the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4 are jointly used as the controlled ends of the inversion module.
The direct current from the first rectifying and filtering module is converted into high-frequency alternating current through the inversion module, namely square wave with a required voltage value, and the voltage value can be adjusted through the control module.
As shown in fig. 5, the output rectifying and filtering module is provided as an LC filter circuit. The square wave voltage output by the inversion module is converted into direct current voltage with required amplitude through rectification and filtering by the output rectification and filtering module.
As shown in fig. 6, the output module includes a plurality of electromagnetic switches, and an execution end of each electromagnetic switch connects an output end of the output module with a latching power end of a latching relay of the switch cabinet or connects an output end of the output module with a power end of a motor of the circuit breaker, and a controlled end of each electromagnetic switch is controlled by the control module.
The electromagnetic switch can be set as an SSR direct current solid state relay with the model GJ40DD, the output end of the SSR direct current solid state relay is arranged on the locking power end of the locking relay of the switch cabinet or the power end of the motor of the circuit breaker, the output end of the output rectifying and filtering module is connected with the input end of the output module, namely d1 and d2 in fig. 6 are respectively connected with d1 and d2 in fig. 5, and the outputs e1 and e2 are connected with the locking power end of the locking relay of the switch cabinet or the energy storage power end of the motor of the circuit breaker.
The output module can output multiple paths of direct-current voltages at the same time, the outputs are not affected mutually, and each path of output can be independently opened and closed; the direct-current voltage output by each path can be fed back to the control module in time, and the control module can control the on-off state of the output module without path output.
The output module can be connected with various interface matching conversion devices through experimental wires, the experimental wires are connected with each path of direct-current voltage output of the output module, and the other end of each experimental wire is connected with one interface matching conversion device. The interface matching conversion device may be: the plug jack, the contact pin or the clamp with insulation and the like which are directly butted with interfaces of the circuit breaker such as aviation plug and terminal strip and the like are provided with a plurality of different types, and the plug jack, the contact pin or the clamp with insulation can be adapted to terminal strips or aviation plug of various circuit breakers of common types on the market.
Optionally, the shell of the power failure test power supply device of the switch cabinet can be an insulating plastic shell, and is portable and convenient to carry.
As shown in fig. 7, the control module adopts a single chip microcomputer with the model number of STM8L151C8T6 as a control chip U1, four first GPIO pins of the control chip U1 are used as first data interaction pins, and the four first GPIO pins are respectively connected with gates of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube; the multiple second GPIO pins of the control chip U1 are used as second data interaction pins, and each second GPIO pin is connected with a controlled end of one electromagnetic switch.
Optionally, the first data interaction pin may include a PD0 pin, a PD1 pin, a PD2 pin, and a PD3 pin of the control chip U1, where the PD0 pin is connected to the gate of the first switching tube Q1, the PD1 pin is connected to the gate of the second switching tube Q2, the PD2 pin is connected to the gate of the third switching tube Q3, and the PD3 pin is connected to the gate of the first switching tube Q4, so as to generate a PWM wave, thereby implementing control of the output voltage. The electromagnetic switch may include switches K1 to K4, and the second data interaction pin may include a PB1 pin, a PB2 pin, a PB3 pin, and a PB4 pin of the control chip U1, where the PB1 pin is connected to a controlled end of the switch K1, the PB2 pin is connected to a controlled end of the switch K2, the PB3 pin is connected to a controlled end of the switch K3, and the PB4 pin is connected to a controlled end of the switch K4, and outputs an on/off instruction of the switch, thereby controlling an output of the output module.
In one possible embodiment, a minimum system is provided on the control chip U1.
As shown in fig. 8, the communication module includes a transceiver chip U2 with a model a7139, a data transmission interface of the transceiver chip U2 is connected to a third GPIO pin of the control chip U1, and the transceiver chip U2 is connected to the remote control terminal in a wireless communication manner.
Optionally, the TXD pin and the RXD pin of the transceiver chip U2 are used as data transmission interfaces thereof, the PC0 pin and the PC1 pin of the control chip U1 are used as third GPIO pins thereof, and the TXD pin and the RXD pin of the transceiver chip U2 are respectively connected with the PC1 pin and the PC0 pin of the control chip U1 in a one-to-one correspondence manner, so that the control chip U1 can wirelessly communicate with the remote control terminal through the transceiver chip U2.
It should be noted that, in order to ensure the normal operation of the control module and the communication module, it is also necessary to provide the control module and the communication module with the operating voltage required by the normal operation, and to provide necessary peripheral circuits to support the normal operation of the device.
The utility model can convert the alternating voltage into smooth direct voltage with adjustable size, and directly provides unlocking power supply for the locking relay of the switch cabinet or provides energy storage power supply for the motor of the circuit breaker. The device has saved the mechanism panel of demolishing the circuit breaker or manual energy storage for circuit breaker mechanism, and the mechanism that leads to hurts people risk and inefficiency's problem, greatly reduced the security risk in the test process, improved test efficiency and reduced user's power failure time.
The working principle of the utility model is as follows:
step 1: the type of a device, such as a terminal strip or aviation plug, intensively led out by a latching relay of a switch cabinet or a control terminal of the energy storage of a circuit breaker motor is confirmed, and corresponding interface devices, such as jacks, pins, clamps with insulation and the like, are respectively replaced at an interface matching conversion device according to the different types of the devices.
Step 2: according to the instruction book of the switch cabinet or the circuit breaker, confirming that the locking relay to be unlocked or the control terminal number of the motor to be stored energy, for example, the locking relay control terminal on aviation plug is a 20-49 terminal, and the control terminal of the motor to be stored energy is a 25-35 terminal; the rated voltage of the latching relay and the energy storage motor, such as direct current 220V, is also confirmed according to the specification.
Step 3: and connecting one path (or multiple paths, namely when multiple paths of output are needed) of interface matching conversion devices with the corresponding control terminal numbers of the latching relay to be unlocked or the motor to be stored.
Step 4: inputting control parameters on a remote control, comprising: which dc voltage output needs to be turned on, for example, 1 (or 1, 2, etc.); the voltage amplitude and duration of each direct current voltage output.
Step 5: after the remote controller sends out a control instruction, the power supply device for unlocking the locking relay of the switch cabinet and storing energy of the motor of the circuit breaker outputs smooth and numerical designated direct-current voltage (such as 220V) to the control terminal (such as 20, 49 terminals or 25, 35 terminals) of the locking relay of the switch cabinet or the energy storage motor after a series of operations such as filtering, rectifying, inverting and re-rectifying the input alternating-current power supply, and the locking relay is automatically attracted to unlock after the locking relay is electrified or the energy storage motor is electrified, the motor starts to rotate to store energy, namely the locking relay of the switch cabinet is unlocked or the energy storage motor of the circuit breaker is stored in an electric mode.
Step 6: after the output direct-current voltage of the device is continuously set for a set time, or after the output is stopped by manual operation control of the remote controller, the device stops outputting the direct-current voltage, so that the relay or the energy storage motor is ensured to be electrified for a long time, and the accident of heating and burning is caused.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the utility model, and is not meant to limit the scope of the utility model, but to limit the utility model to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (9)
1. The power supply device for the power failure test of the switch cabinet is characterized by comprising an input filtering module, a first rectifying and filtering module, an inversion module, an output rectifying and filtering module, an output module, a control module, a communication module and a remote control terminal;
the input end of the input filtering module is connected with external alternating current, the output end of the input filtering module is connected with the input end of the first rectifying and filtering module, the output end of the first rectifying and filtering module is connected with the input end of the inversion module, the output end of the inversion module is connected with the input end of the output rectifying and filtering module, the output end of the output module is connected with the locking power end of the locking relay of the switch cabinet and the power end of the motor of the circuit breaker respectively, a first data interaction pin of the control module is connected with the controlled end of the inversion module, a second data interaction pin of the control module is connected with the controlled end of the output module, a third data interaction pin of the control module is connected with a fourth data interaction pin of the communication module, and the communication module is in wireless communication connection with the remote control terminal.
2. The power failure test power supply device of claim 1, wherein the input filter module comprises a capacitor C1, an inductor L1 and an inductor L2;
the two ends of the capacitor C1 are jointly used as an input end of the input filter module, the two ends of the capacitor C1 are respectively connected with one end of the inductor L1 and one end of the inductor L2, and the other end of the inductor L1 and the other end of the inductor L2 are jointly used as an output end of the input filter module;
at least one capacitor branch and at least one resistor branch are arranged between the other end of the inductor L1 and the other end of the inductor L2, the capacitor branch comprises at least one series capacitor, and the resistor branch comprises at least one series resistor.
3. The switchgear outage test power supply device according to claim 1, wherein the first rectifying and filtering module is provided as a bridge rectifier U3;
the two output ends of the bridge rectifier U3 are used as the input ends of the first rectifying and filtering module together, and the two output ends of the bridge rectifier U3 are used as the output ends of the first rectifying and filtering module together; at least one filtering branch circuit is arranged between two output ends of the bridge rectifier U3, and the filtering branch circuit comprises at least one series capacitor.
4. The switchgear outage test power supply device according to claim 1, wherein the inverter module comprises a full-bridge inverter U3 and a transformer T1;
the full-bridge inverter U3 comprises a first switching tube, a second switching tube, a third switching tube and a fourth switching tube, wherein the drain electrode of the first switching tube and the source electrode of the second switching tube are jointly used as the input end of the inversion module, the drain electrode of the first switching tube is connected with the drain electrode of the third switching tube, the source electrode of the second switching tube is connected with the source electrode of the fourth switching tube, the source electrode of the first switching tube is respectively connected with the drain electrode of the second switching tube and one end of the primary side of the transformer T1, the source electrode of the third switching tube is respectively connected with the drain electrode of the fourth switching tube and the other end of the primary side of the transformer T1, and the two ends of the secondary side of the transformer T1 are jointly used as the output end of the inversion module, and the grid electrodes of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are jointly used as the controlled end of the inversion module.
5. The switchgear outage test power supply device according to claim 1, wherein the output rectifying and filtering module is configured as an LC filter circuit.
6. The power failure test power supply device of the switch cabinet according to claim 4, wherein the output module comprises a plurality of electromagnetic switches, an execution end of each electromagnetic switch is used for connecting an output end of the output module with a locking power supply end of a locking relay of the switch cabinet or connecting an output end of the output module with a power supply end of a motor of the circuit breaker, and a controlled end of each electromagnetic switch is controlled by the control module.
7. The power failure test power supply device of the switch cabinet according to claim 6, wherein the control module adopts a singlechip with the model of STM8L151C8T6 as a control chip U1, four first GPIO pins of the control chip U1 are used as first data interaction pins, and the four first GPIO pins are respectively connected with gates of a first switch tube, a second switch tube, a third switch tube and a fourth switch tube;
and a plurality of second GPIO pins of the control chip U1 are used as second data interaction pins, and each second GPIO pin is connected with a controlled end of one electromagnetic switch.
8. The power failure test power supply device for a switch cabinet according to claim 7, wherein a minimum system is arranged on the control chip U1.
9. The power failure test power supply device of claim 7, wherein the communication module comprises a transceiver chip U2 with a model number of a7139, a data transmission interface of the transceiver chip U2 is connected with a third GPIO pin of the control chip U1, and the transceiver chip U2 is in wireless communication connection with a remote control terminal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320823661.9U CN219268734U (en) | 2023-04-13 | 2023-04-13 | Power failure test power supply device for switch cabinet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320823661.9U CN219268734U (en) | 2023-04-13 | 2023-04-13 | Power failure test power supply device for switch cabinet |
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| Publication Number | Publication Date |
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| CN219268734U true CN219268734U (en) | 2023-06-27 |
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| CN202320823661.9U Active CN219268734U (en) | 2023-04-13 | 2023-04-13 | Power failure test power supply device for switch cabinet |
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