CN113671300A - Batch test system and test method for relay protection devices - Google Patents
Batch test system and test method for relay protection devices Download PDFInfo
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- CN113671300A CN113671300A CN202111134963.7A CN202111134963A CN113671300A CN 113671300 A CN113671300 A CN 113671300A CN 202111134963 A CN202111134963 A CN 202111134963A CN 113671300 A CN113671300 A CN 113671300A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0416—Connectors, terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0677—Localisation of faults
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
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Abstract
The invention discloses a batch test system of relay protection devices, which comprises a relay protection test box (5), a relay protection tester (1), a network switch (2), a communication manager (3) and a workstation (4), wherein before testing, a plurality of relay protection devices are connected in series at current terminals, in parallel at voltage terminals, in parallel at switching value input respectively, in parallel at switching value output and then are connected into the relay protection test box through test terminals.
Description
Technical Field
The invention relates to a test system, in particular to a relay protection device test system and a test method thereof.
Background
The relay protection device is applied to protection of power equipment in a medium-voltage and high-voltage power system, the existing delivery test of the relay protection device adopts a single test, and during batch production, the test work and the wiring work need to be repeated, so that the workload of testers is large, and the test efficiency is low.
Disclosure of Invention
The invention aims to provide a batch test system for relay protection devices, which can realize batch test of relay protection devices of the same type or with the same hardware structure at one time and solve the problems of repeated test contents and repeated wiring of a plurality of devices. The technical scheme of the invention is as follows: the utility model provides a relay protection device is test system in batches, characterized by: the relay protection testing device comprises a relay protection tester (1), a network switch (2), a communication manager (3), a workstation (4) and a relay protection testing box (5), wherein the relay protection testing box (5) comprises a switching value input testing module, a switching value output testing module, a current testing terminal, a voltage testing terminal, a circuit breaker simulation module and a common terminal row; the switching value input testing module comprises a knob switch and a switching value input testing terminal, the switching value output module comprises an output indicating lamp and a switching value output testing terminal, and the breaker simulation module comprises a switching-off relay, a switching-on relay, a position indicating lamp, a switching-off and switching-on testing switch and a breaker testing terminal; the connection mode among each components is as follows: the network interface of the communication management machine (3) is connected with the network switch (2), the network interface of the workstation (4) is connected with the switch (2) through a network cable, the current output end and the voltage output end of the relay protection tester (1) are respectively connected with the current input end and the voltage input end of a common terminal row in the relay protection test box (5), the current output end of the common terminal row in the relay protection test box (5) is connected with each current test terminal in series, the current output end of the last current test terminal is connected with the common terminal row of the relay protection test box (5) after being short-circuited, the other side of the common terminal row is connected with the N-phase output end of the relay protection tester (1), the voltage output end of the relay protection tester (1) is connected with the voltage terminal of the common terminal row of the relay protection test box (5), the other end of the common terminal row is connected with each voltage test terminal row in parallel, the switching value input test terminal of the relay protection test box (5) is connected in parallel, and the switching value output module and the circuit breaker simulation module of the relay protection test box (5) correspond to the tested relay protection loops one by one.
The utility model provides a relay protection device is test system in batches which characterized by: each RS485 interface of the communication manager (3) is provided with 1-8 serial communication test interfaces.
The utility model provides a relay protection device is test system in batches which characterized by: the RJ45 interface output end of the network switch (2) is provided with an RJ45 interface terminal.
The utility model provides a relay protection device is test system in batches which characterized by: the display picture of the workstation (4) comprises a relay protection device switching value input optical character, a protection action information optical character, a current and voltage analog quantity display, and when information displacement exists, the corresponding optical character is changed from green to red.
The utility model provides a relay protection device is test system in batches which characterized by: the trip outlet test terminal of the relay protection device is connected to the trip command inlet of the control plug-in unit of the relay protection test box (5), the switch-on outlet test terminal of the relay protection device is connected to the switch-on command inlet of the control plug-in unit, and the signal outlet test terminal of the relay protection device is connected with the output indicator lamp in series.
The utility model provides a relay protection device is test system in batches which characterized by: the power supplies of the tested relay protection device and the relay protection test box (5) are the same power supply.
The utility model provides a relay protection device is test system in batches which characterized by: and a current test terminal, a voltage test terminal, a switching value input test terminal, a switching value output test terminal and a circuit breaker test terminal of the relay protection test box (5) are matched with a wiring terminal of the tested relay protection device.
The utility model provides a relay protection device is test system in batches which characterized by: the length of the wiring between the test terminals with the same test function is larger than the distance between the terminals of the same loop between the tested devices
A test method for a batch test system of relay protection devices is characterized in that the communication address of a tested relay protection device corresponds to the address of a test system, and the secondary protection test fixed values of the same protection function of the tested relay protection device are the same.
A test method of a batch test system of relay protection devices is the same as the communication protocol of the tested relay protection devices connected with the same RS485 bus of a communication manager (3). The working principle of the invention is as follows:
as shown in figure 1, an RS485 test terminal is inserted into a tested device with an RS485 interface, an RJ45 test terminal is inserted into a tested device with an RJ45 interface, when the tested device is provided with an RJ45 interface and an RS485 interface at the same time, only one interface is selected for communication, a switching value input test terminal, a switching value output test terminal, a breaker test terminal, a voltage terminal and a current terminal are respectively connected to plug-in terminals corresponding to relay protection, namely, switching value input circuits of each device are connected in parallel, current circuits are connected in series, voltage circuits are connected in parallel, switching value output circuits, namely, outlet circuits and control circuits are independently tested, in order to ensure that the test terminals can be connected with the corresponding tested devices, and the current test terminal, the voltage test terminal, the switching value input test terminal, the switching value output test terminal and the breaker test terminal of a relay protection test box (5) are matched with wiring terminals of the tested protection devices and each test function is the same The length of the wiring between the test terminals is larger than the distance between the same loop terminals between the tested devices, and if the length of the wiring between the test terminals is smaller than the distance between the same loop terminals between the tested devices, the distance between the terminals is insufficient, and the adjacent devices cannot be connected. The communication address of the tested relay protection device corresponds to the address of the test system, and as the switching value, the relay protection action information and the like of the relay protection device are displayed through the picture of the workstation (4) of the batch test system during testing, the normal communication between the tested device and the test system and the consistency between the action information and the picture display action information of the workstation (4) can be ensured only by requiring the correspondence between the communication address of the tested relay protection device and the address of the test system, the secondary protection test set values of the same protection function of the tested relay protection device are the same, and the same set values are ensured, all the tested relay protection devices can be ensured to act only by loading the analog quantity of the relay protection device by the relay protection tester (1), so that the protection functions of all the tested relay protection devices can be tested at one time; the tested relay protection devices connected with the same RS485 bus of the communication manager (3) have the same communication protocol, and the protection devices connected with the same RS485 bus can be ensured to normally communicate.
The tested device and the relay protection test box (5) adopt a direct current power supply to prevent the power supply from short circuit caused by the switching action. Before testing, the address of the tested device needs to be modified according to the communication address configured by the communication manager, and meanwhile, the same test fixed values of the same protection function of the tested device are ensured to be the same; before the test is prepared, the communication normality of the tested device needs to be checked on the picture of the workstation (4);
as shown in fig. 2, the switching value input circuits corresponding to the relay protection devices to be tested are connected in parallel and then connected in series with the test circuit of the relay protection test box (5), so that one switching value input can be performed to simultaneously test the corresponding switching value inputs of all connected devices, and the connection can simultaneously complete the test of the switching value input circuits of all the devices by only setting the number of the rotary switches of the relay protection test box (5) according to the maximum number of the switching value inputs of all the devices to be tested. When the switching value is tested to be input, the first rotary switch is rotated to a testing position and the corresponding contact is closed, at the moment, the first switching value input of all tested devices is set, all tested devices upload information to the workstation (4) through the communication interface, the light characters corresponding to the first switching value on the picture of the workstation (4) are changed from green to red, the action information of the first switching value is displayed at the same time, and the switching value input test can be completed by testing other switching values according to the action information.
As shown in fig. 4, the current loops of the tested devices are connected in series, the voltage loops are connected in parallel, when the relay protection tester (1) outputs rated voltage and current, all the tested devices acquire corresponding voltage and current analog quantities and upload the voltage and current analog quantities to the workstation (4) through the communication interface, and at the moment, whether the voltage and current display values corresponding to the tested devices displayed on the screen of the workstation (4) are correct is checked;
as shown in fig. 3, when testing the relay protection outlet, the voltage and current output by the relay protection tester can satisfy the action value corresponding to the protection function, the corresponding relay protection outlet is closed, when the corresponding outlet is a trip outlet, the control plug-in of the relay protection device makes the trip relay coil of the relay protection test box (5) get power to complete the trip action, and simultaneously the control plug-in of the relay protection device makes the position indicator lamp of the relay protection test box (5) turn green to represent the opening of the switch, when the corresponding outlet is a closing outlet, the closing command makes the closing outlet of the relay protection device closed, the control plug-in of the relay protection test box (5) makes the closing relay coil of the relay protection test box (5) get power to complete the closing action, and the control plug-in of the relay protection device makes the position indicator lamp of the relay protection test box (5) turn red, representing a switch-on. When the outlet of the relay protection is a signal outlet, the outlet contact is closed, the signal loop indicator lamp of the relay protection test box (5) is electrified and lightened, the corresponding outlet indicator lamp or the tripping and closing action conditions can be visually checked, whether the corresponding information displayed on the picture of the workstation (4) is correct or not is checked, and the corresponding protection action light character on the picture of the workstation (4) is changed from green to red.
When the switching value input, analog value and switching value output actions or display results of the relay protection device are tested to be wrong, the corresponding tested device needs to be maintained and then tested again.
The communication management machine (3) is generally provided with 8-16 RS485 interfaces, each RS485 interface of the communication management machine (3) is provided with 1-8 serial communication testing interfaces, and a bus can be connected into 8 tested relay protection devices, so that the functions of switching value input, switching value output, analog quantity, protection action test, communication and the like of a plurality of relay protection devices can be completed at one time, and batch test of the relay protection devices is realized.
The invention realizes batch test of the relay protection devices and can check the test action condition of the tested relay protection devices in real time through the workstation.
The invention has the technical effects that:
the invention aims to realize batch test of the relay protection device. The characteristics are as follows:
1. the relay protection devices are tested in batches, and the number of the tested relay protection devices is not limited by a system.
2. During testing, repeated wiring is not needed, and only the corresponding testing terminal is required to be inserted into the device, so that the wiring work is greatly reduced, and meanwhile, the risks of short circuit and personnel safety caused by wiring errors are avoided.
3. The device with the same model can be tested at the same time, and the device with different models and different hardware structures can also be tested at the same time.
4. Besides testing hardware, the communication of the device can be tested simultaneously, and the testing function is comprehensive.
5. The corresponding loop of each device has an independent display result, and when any one of the switching value, the analog value or the communication of the device to be tested has a fault, the fault device and the fault loop are easy to judge.
6. And the test result is checked through the workstation and is clear at a glance.
Drawings
FIG. 1 is a system topology diagram of the present invention
FIG. 2 is a schematic diagram of the switching value input test according to the present invention
FIG. 3 is a schematic diagram of the testing of the switching value output and control plug-in of the present invention
FIG. 4 is a schematic diagram of the current and current loop wiring of the present invention
Detailed Description
A relay protection device batch test system comprises a relay protection tester 1, a network switch 2, a communication manager 3, a workstation 4 and a relay protection test box 5, wherein the relay protection test box 5 comprises a switching value input test module, a switching value output test module, a current test circuit, a voltage test circuit, a circuit breaker simulation module and a common terminal row; the switching value input test module comprises a knob switch and a test input terminal, the switching value output module comprises an output indicator lamp and a test output terminal, and the circuit breaker simulation module comprises a switching-off relay, a switching-on relay, a position indicator lamp, a switching-on and switching-off test switch and a test terminal; the connection mode among each components is as follows: the relay protection tester 1 is connected with a relay protection test box 5, a network interface of the communication manager 3 is connected with a network switch 2, a network interface of the workstation 4 is connected with the switch 2 through a network cable, and the relay protection test box 5 is provided with a test terminal matched with a tested relay protection device; one end of the common terminal row is connected with the output ends of three-phase current and zero-sequence current of the relay protection tester 1, the other end of the common terminal row is connected to a current input test terminal of a first tested relay protection device, the current output end of the first relay protection device is connected to the current input end of a second relay protection device and sequentially connected to the current input end of the last relay protection device, the current output end of the last relay protection device is connected to the common terminal row of the relay protection test box after being in short circuit, and the other side of the terminal row is connected to the N-phase output end of the relay protection tester 1; the voltage output end of the relay protection tester 1 is connected to a voltage terminal of a common terminal row of the relay protection test box, and the voltage test terminal of the tested relay protection device is connected in parallel at the other end of the common terminal row through a wire; corresponding switching value test terminals of different devices are connected in parallel and then are connected in series with the switching value input test circuit; the wiring length between the test terminals with the same test function is larger than the distance between the same loop terminals between the tested devices.
The utility model provides a relay protection device is test system in batches, every RS485 interface of communication supervisor 3 has 1 ~ 8 binding post that RS485 bus mode is connected and links to each other with the RS485 interface of being surveyed relay protection device.
A relay protection device batch test system is characterized in that an RJ45 interface output end of a network switch 2 is provided with an RJ45 interface terminal which is connected with an RJ45 communication interface of a tested relay protection device.
A batch test system for relay protection devices is characterized in that a display picture of a workstation 4 comprises switching value input optical words of the relay protection devices, protection action information optical words, current and voltage analog quantity display, and when information is shifted, corresponding optical words are changed from green to red.
A relay protection device batch test system is characterized in that a trip outlet test terminal of a relay protection device is connected to a trip command inlet of a control plug-in unit, a closing outlet test terminal of the relay protection device is connected to a closing command inlet of the control plug-in unit, and a signal outlet test terminal of the relay protection device is connected with an output indicator lamp in series.
A batch test system for relay protection devices is characterized in that the power supplies of tested relay protection devices and a relay protection test box 5 are the same.
A batch test system for relay protection devices is provided, wherein secondary protection test constant values of the same protection function of tested relay protection devices are the same.
A batch test system for relay protection devices is characterized in that a communication address of a tested relay protection device corresponds to a test system address.
The specific working process is as follows: as shown in fig. 1, the RS485 test terminal is inserted into the device under test with the RS485 interface, the RJ45 test terminal is inserted into the device under test with the RJ45 interface, when the device under test is provided with both the RJ45 interface and the RS485 interface, only one interface is selected to communicate, the switch quantity test terminal, the outlet test terminal, the control plug-in test terminal, the voltage terminal and the current terminal are respectively connected to the corresponding plug-ins, which is equivalent to connecting the switch quantity input circuit of each device in parallel, connecting the current circuit in series, connecting the voltage circuit in parallel, and connecting the switch quantity output circuit, i.e. the outlet circuit and the control circuit, independently, in order to ensure that the test terminals can be connected with the corresponding test devices, the connection length between the test terminals with the same test function is larger than the distance between the same circuit terminals between the devices under test, if the connection length between the test terminals is smaller than the distance between the same circuit terminals between the devices under test, this results in insufficient distance between terminals and failure to connect adjacent devices.
The tested device and the relay protection test box adopt a direct current power supply to prevent the power supply from short circuit caused by the switching action. Before testing, the address of the tested device needs to be modified according to the communication address configured by the communication manager, and meanwhile, the same test fixed values of the same protection function of the tested device are ensured to be the same; before the test is prepared, the communication normality of the tested device needs to be checked on a work station picture;
as shown in fig. 2, the switching value input circuits corresponding to the relay protection devices to be tested are connected in parallel and then connected in series with the test circuits of the relay protection test box, so that one switching value input can be performed to simultaneously test the corresponding switching value inputs of all connected devices, and the connection can simultaneously complete the tests of all the devices by setting the number of the rotary switches of the relay protection test box according to the maximum number of the switching value inputs of all the devices to be tested. When the switching value is tested to be input, the first rotary switch is rotated to the test position to be closed corresponding to the contact, at the moment, the first switching value of all tested devices is set, all tested devices upload information to the workstation 4 through the communication interface, light characters corresponding to the first switching value on a picture of the workstation 4 are changed from green to red, the alarm information of the first switching value is displayed simultaneously, and the switching value input test can be completed by testing other switching values.
As shown in fig. 4, the current loops of the devices to be tested are connected in series, the voltage loops are connected in parallel, when the relay protection tester outputs rated voltage and current, all the devices to be tested acquire corresponding voltage and current analog quantities and upload the voltage and current analog quantities to the workstation 4 through the communication interface, and at this time, whether the voltage and current display values corresponding to the devices to be tested displayed on the screen of the workstation 4 are correct is checked;
as shown in fig. 3, when the relay protection outlet is tested, the voltage and current output by the relay protection tester can meet the action value of the corresponding protection function, the corresponding relay protection outlet is closed, when the corresponding outlet is a trip outlet, the control plug-in of the relay protection device enables the trip relay coil to be powered on, and the trip action is completed, meanwhile, the position indicator lamp is changed into green through the relay protection device control plug-in, representing switching-off, when the corresponding outlet is a switching-on outlet, the switching-on command enables the switching-on outlet of the relay protection device to be closed, the switching-on relay coil is powered on through the relay protection device control plug-in, and the switching-on action is completed, and the position indicator lamp is changed into red through the relay protection device control plug-in, representing switching-on. When the corresponding outlet is a signal outlet, the outlet contact is closed, the signal loop indicator lamp is electrified and lightened, the corresponding outlet indicator lamp or the tripping and closing action conditions are checked, whether the corresponding information displayed on the picture of the workstation 4 is correct or not is checked, and the corresponding protection action light character on the picture of the workstation 4 is changed from green to red.
When the input, analog and switching output actions of the switching value are tested or the display result is wrong, the corresponding testing device needs to be repaired and then tested again.
The operation principle and the embodiment of the present invention are described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiment. The invention realizes batch test of the relay protection devices, simultaneously tests a plurality of devices, has comprehensive test functions, does not need the test personnel to re-wire, has high efficiency and rapidness in test, and has simple system constitution and easy implementation.
Claims (10)
1. The utility model provides a relay protection device is test system in batches which characterized by: the relay protection testing device comprises a relay protection tester (1), a network switch (2), a communication manager (3), a workstation (4) and a relay protection testing box (5), wherein the relay protection testing box (5) comprises a switching value input testing module, a switching value output testing module, a current testing terminal, a voltage testing terminal, a circuit breaker simulation module and a common terminal row; the switching value input testing module comprises a knob switch and a switching value input testing terminal, the switching value output module comprises an output indicating lamp and a switching value output testing terminal, and the breaker simulation module comprises a switching-off relay, a switching-on relay, a position indicating lamp, a switching-off and switching-on testing switch and a breaker testing terminal; the connection mode among each components is as follows: the network interface of the communication management machine (3) is connected with the network switch (2), the network interface of the workstation (4) is connected with the switch (2) through a network cable, the current output end and the voltage output end of the relay protection tester (1) are respectively connected with the current input end and the voltage input end of a common terminal row in the relay protection test box (5), the current output end of the common terminal row in the relay protection test box (5) is connected with each current test terminal in series, the current output end of the last current test terminal is connected with the common terminal row of the relay protection test box (5) after being short-circuited, the other side of the common terminal row is connected with the N-phase output end of the relay protection tester (1), the voltage output end of the relay protection tester (1) is connected with the voltage terminal of the common terminal row of the relay protection test box (5), the other end of the common terminal row is connected with each voltage test terminal row in parallel, the switching value input test terminal of the relay protection test box (5) is connected in parallel, and the switching value output module and the circuit breaker simulation module of the relay protection test box (5) correspond to the switching value output module and the circuit breaker simulation module of the tested relay protection one by one.
2. The batch test system of the relay protection devices as claimed in claim 1, wherein: each RS485 interface of the communication manager (3) is provided with 1-8 serial communication test interfaces.
3. The batch test system of the relay protection devices as claimed in claim 1, wherein: the RJ45 interface output end of the network switch (2) is provided with an RJ45 interface terminal.
4. The batch test system of the relay protection devices as claimed in claim 1, wherein: the display picture of the workstation (4) comprises a relay protection device switching value input optical character, a protection action information optical character, a current and voltage analog quantity display, and when information displacement exists, the corresponding optical character is changed from green to red.
5. The batch test system of the relay protection devices as claimed in claim 1, wherein: the trip outlet test terminal of the relay protection device is connected to the trip command inlet of the control plug-in unit of the relay protection test box (5), the switch-on outlet test terminal of the relay protection device is connected to the switch-on command inlet of the control plug-in unit, and the signal outlet test terminal of the relay protection device is connected with the output indicator lamp in series.
6. The batch test system of the relay protection devices as claimed in claim 1, wherein: the power supplies of the tested relay protection device and the relay protection test box (5) are the same power supply.
7. The batch test system of the relay protection devices as claimed in claim 1, wherein: and a current test terminal, a voltage test terminal, a switching value input test terminal, a switching value output test terminal and a circuit breaker test terminal of the relay protection test box (5) are matched with a wiring terminal of the tested relay protection device.
8. The batch test system of the relay protection devices as claimed in claim 1, wherein: the wiring length between the test terminals with the same test function is larger than the distance between the same loop terminals between the tested devices.
9. A test method of a batch test system of relay protection devices is characterized by comprising the following steps: the communication address of the tested relay protection device corresponds to the address of the test system, and the secondary protection test fixed values of the same protection function of the tested relay protection device are the same.
10. The method for testing the relay protection device batch test system according to claim 9, wherein the method comprises the following steps: the tested relay protection device connected with the same RS485 bus of the communication manager (3) has the same communication protocol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111134963.7A CN113671300A (en) | 2021-09-27 | 2021-09-27 | Batch test system and test method for relay protection devices |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111134963.7A CN113671300A (en) | 2021-09-27 | 2021-09-27 | Batch test system and test method for relay protection devices |
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| CN113671300A true CN113671300A (en) | 2021-11-19 |
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| CN202111134963.7A Pending CN113671300A (en) | 2021-09-27 | 2021-09-27 | Batch test system and test method for relay protection devices |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114446681A (en) * | 2021-12-23 | 2022-05-06 | 深圳供电局有限公司 | Air switch safety device and air switch safety equipment |
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2021
- 2021-09-27 CN CN202111134963.7A patent/CN113671300A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114446681A (en) * | 2021-12-23 | 2022-05-06 | 深圳供电局有限公司 | Air switch safety device and air switch safety equipment |
| CN114446681B (en) * | 2021-12-23 | 2023-08-25 | 深圳供电局有限公司 | Air switch safety device and air switch safety equipment |
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