CN110579666A - automatic test system for transformer relay protection equipment - Google Patents
automatic test system for transformer relay protection equipment Download PDFInfo
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- CN110579666A CN110579666A CN201910973942.0A CN201910973942A CN110579666A CN 110579666 A CN110579666 A CN 110579666A CN 201910973942 A CN201910973942 A CN 201910973942A CN 110579666 A CN110579666 A CN 110579666A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The application relates to an automatic test system of transformer relay protection equipment, include: the device comprises a clamp, a relay protection instrument, a switch and an upper computer, wherein the clamp is provided with a connecting port for accessing to a tested device, the tested device is connected with one end of the relay protection instrument through the connecting port, the other end of the relay protection instrument is connected with one end of the switch, and the other end of the switch is connected with the upper computer. The upper computer sends the test instruction to the relay protection instrument through the switch, the relay protection instrument determines the output analog quantity of the tested equipment according to the test instruction, the tested equipment acts based on the output analog quantity, generated test data are fed back to the relay protection instrument through the connecting port, the relay protection instrument generates a corresponding test result according to the test data, the test result is fed back to the upper computer through the switch, and the upper computer judges the test result and generates a corresponding test report. The automatic execution of different test items can be realized, the test result is judged, and the working efficiency of the test process is improved.
Description
Technical Field
The application relates to the technical field of electric power, in particular to an automatic testing system for transformer relay protection equipment.
Background
In the power system, the relay protection device is used for timely sending out a warning signal to corresponding staff when power components, such as a generator, a line and the like, or the power system, generates faults to endanger the safe operation of the power system, or sending out a tripping command to a controlled breaker to prevent the events from further developing, so that damage to the power system is reduced.
In order to verify the functions, performances and the like of relay protection equipment, a plurality of tests need to be performed on the relay protection equipment in advance, at present, in the test process, operations such as manual wiring of a tester, establishment of an open-close environment, application of a proper analog quantity to a device, statistics and calculation of test data are needed, and the test process of completing the hardware, the protection functions and the like of the relay protection equipment is complex, a large amount of manpower and material resources need to be consumed, so that the test work efficiency is low.
Disclosure of Invention
Therefore, it is necessary to provide an automatic testing system for transformer relay protection equipment, which can improve the testing work efficiency of the relay protection equipment, in order to solve the above technical problems.
an automated testing system for transformer relay protection equipment, the system comprising: the system comprises a clamp, a relay protection instrument, a switch and an upper computer;
The fixture is provided with a connecting port for accessing a tested device, and the tested device is connected with one end of the relay protection instrument through the connecting port; the other end of the relay protection instrument is connected with one end of the switch; the other end of the switch is connected with the upper computer;
The upper computer sends a test instruction to the relay protection instrument through the switch, the relay protection instrument determines the output analog quantity of the tested equipment according to the test instruction and sends the output analog quantity to the tested equipment, the tested equipment acts based on the output analog quantity and feeds generated test data back to the relay protection instrument through a connecting port, the relay protection instrument generates a corresponding test result according to the test data and feeds the test result back to the upper computer through the switch, and the upper computer judges the test result and generates a corresponding test report.
In one embodiment, the connection ports of the clamp comprise an aviation plug, a network cable port, a claw pin and a network cable crystal head; the claw needle is connected with the aviation plug through a lead, and all the network cable ports are connected through network cables; the claw pins and the network cable crystal heads are arranged according to the layout and the size of the wiring terminals of the tested equipment.
In one embodiment, the system further comprises: a serial server;
One end of the serial server is connected with the output end of the switch, and the other end of the serial server is connected with one end of the clamp;
The upper computer is used for sending the Ethernet data to the serial server through the switch, and the serial server converts the Ethernet data into serial data and transmits the serial data to the connecting port of the clamp.
In one embodiment, the system further comprises an I/O device and a programmable power supply;
One end of the I/O equipment is connected with a remote signaling input port of the tested equipment and a remote signaling output port, one end of the programmable power supply is connected with one end of the switch, and the other end of the programmable power supply is respectively connected with the I/O equipment and the tested equipment;
the I/O equipment is provided with a switch and an indicator light, receives an opening signal sent by the equipment to be tested through the remote signaling output port, receives an opening signal sent by the programmable power supply through the remote signaling input port, and adjusts the states of the corresponding switch and the indicator light according to the opening signal;
The program-controlled power supply receives a power supply control instruction sent by the upper computer through the switch, sends an input signal to the I/O equipment according to the power supply control instruction, and supplies power to the I/O equipment and the equipment to be tested.
In one embodiment, the switch is connected with the tested equipment based on a network cable, and sends the data modification instruction sent by the upper computer to the tested equipment, the tested equipment modifies the corresponding numerical value according to the data modification instruction, and the modified equipment information is fed back to the upper computer through the switch.
in one embodiment, the test command comprises a communication test command; the upper computer sends the communication test instruction to the tested equipment through the switch and determines the communication state between the upper computer and the tested equipment; or
and the upper computer sends the communication test instruction to the tested equipment through the serial server to determine the communication state between the upper computer and the tested equipment.
In one embodiment, the test instructions comprise outlet drive test instructions;
And the upper computer sends the outlet transmission test instruction to the tested equipment, the tested equipment executes a transmission opening operation according to the outlet transmission test instruction, and the upper computer reads the sequence record of events corresponding to the transmission opening operation process and acquires the state of the indicator light of the switch corresponding to the I/O equipment.
In one embodiment, the test instructions include analog calibration instructions;
The upper computer sends the analog quantity calibration instruction to the relay protection instrument, the relay protection instrument generates a corresponding rated analog quantity according to the analog quantity calibration instruction and sends the rated analog quantity to the tested device, the tested device performs automatic calibration according to the rated analog quantity, the upper computer reads the telemetering values of the tested device after calibration is completed according to a preset reading period, calculates errors of the telemetering values, and compares the errors with a preset sampling precision standard to obtain an analog quantity calibration result.
in one embodiment, the test instructions comprise action logic test instructions;
The upper computer sends the action logic test instruction to the I/O equipment, the I/O equipment adjusts the states corresponding to the switch and the indicator light according to the action logic test instruction, the upper computer sets the input amount and the control words corresponding to the protection logic according to the control conditions meeting the protection logic, monitors the action state of the protection logic, verifies the correctness of the protection logic, and obtains a corresponding protection logic verification result.
In one embodiment, the test instructions further comprise: an action precision test instruction and an action time test instruction; the upper computer acquires relevant information of the tested equipment, wherein the relevant information comprises a fixed value range and a step length, sends the action precision test instruction to the tested equipment, modifies a protection fixed value of the tested equipment according to the action precision test instruction, puts the modified protection fixed value into a soft and hard pressing plate which is correspondingly protected, verifies whether a digital quantity input condition is met, and obtains a corresponding action precision test result; or
And the upper computer reads the delay timing value range and the step length of the tested equipment, sends the action time test instruction to the tested equipment, modifies the protection delay timing value of the tested equipment, puts the modified protection delay timing value into a soft and hard pressing plate which is correspondingly protected, verifies whether the corresponding digital quantity input condition is met, and obtains a corresponding action time test result.
In the automatic test system of transformer relay protection equipment, the clamp is provided with the connecting port for being connected with the tested equipment, the tested equipment is connected with one end of the relay protection instrument through the connecting port, the other end of the relay protection instrument is connected with one end of the switch, and the other end of the switch is connected with the upper computer. The upper computer sends the test instruction to the relay protection instrument through the switch, the relay protection instrument determines the output analog quantity of the tested equipment according to the test instruction and sends the output analog quantity to the tested equipment, the tested equipment acts based on the output analog quantity, generated test data are fed back to the relay protection instrument through the connecting port, the relay protection instrument generates a corresponding test result according to the test data and feeds the test result back to the upper computer through the switch, and the upper computer judges the test result and generates a corresponding test report. The automatic execution of the test items corresponding to different test instructions can be realized, and the test results can be judged in time, so that the working efficiency of the test process is improved.
drawings
FIG. 1 is a block diagram of an automated testing system for transformer relay protection equipment according to an embodiment;
FIG. 2 is a block diagram of an automated testing system for transformer relay protection devices in another embodiment;
Fig. 3 is a schematic test flow diagram of an automated testing system of transformer relay protection equipment in an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
in one embodiment, as shown in fig. 1, there is provided an automated testing system for transformer relay protection equipment, including: the device comprises a clamp 102, a relay protection instrument 104, a switch 106 and an upper computer 108, wherein the clamp 102 is provided with a connecting port for accessing a device under test 110, the device under test 110 is connected with one end of the relay protection instrument 104 through the connecting port, the other end of the relay protection instrument 104 is connected with one end of the switch 106, and the other end of the switch 106 is connected with the upper computer 108.
The connection ports of the clamp 102 comprise an aviation plug, network cable ports, claw pins and network cable crystal heads, the claw pins are connected with the aviation plug through wires, the network cable ports are connected through network cables, and the claw pins and the network cable crystal heads are arranged according to the layout and the size of the connection terminals of the tested equipment. The switch 106 establishes ethernet data interaction with the upper computer 108, the relay protection instrument 104 and the device under test 110 through the network cable. The upper computer 108 is a control core of the automatic testing system of the transformer relay protection device, is internally provided with a platform special program, controls the relay protection device 104 and the tested device 110 through the switch 106 through Ethernet communication, and judges a testing result and produces a corresponding testing report. The system relay protection instrument 104, the switch 106 and the upper computer 108 are connected with the clamp 102 through a wiring harness and one or more aviation plugs and quick plug terminals.
Specifically, the fixture 102 fixes the device under test 110 by using the structural member and the latch, and the connection point and the network cable port of the device under test 110 are connected to the claw pin and the network cable crystal head of the fixture 102, respectively. The relay protection instrument 104 is used for receiving the test instruction sent by the upper computer 108, determining the output analog quantity of the tested device 110 according to the test instruction, sending the output analog quantity to the tested device 110 through a remote measuring port of the tested device 110, enabling the tested device 110 to act according to the output analog quantity, feeding the generated test data back to the relay protection instrument 104 through a connecting port, enabling the relay protection instrument 104 to generate a corresponding test result according to the test data, feeding the test result back to the upper computer 108 through the switch 106, judging the test result by the upper computer 108, and generating and storing a corresponding test report.
in the automatic test system of the transformer relay protection equipment, the clamp is provided with the connecting port for connecting the tested equipment, and the wiring process can be simplified through the specially-made clamp. The equipment to be tested is connected with one end of the relay protection instrument through the connecting port, the other end of the relay protection instrument is connected with one end of the switch, and the other end of the switch is connected with the upper computer. The upper computer sends the test instruction to the relay protection instrument through the switch, the relay protection instrument determines the output analog quantity of the tested equipment according to the test instruction and sends the output analog quantity to the tested equipment, the tested equipment acts based on the output analog quantity, generated test data are fed back to the relay protection instrument through the connecting port, the relay protection instrument generates a corresponding test result according to the test data and feeds the test result back to the upper computer through the switch, and the upper computer judges the test result and generates a corresponding test report. The automatic execution of the test items corresponding to different test instructions can be realized, and the test results can be judged in time, so that the working efficiency of the test process is improved.
In another embodiment, as shown in fig. 2, there is provided an automatic testing system for transformer relay protection equipment, including: host computer 202, switch 204, relay protection instrument 206, serial server 208, fixture 210, device under test 212, I/O device 214, and programmable power supply 216.
One end of the switch 204 is connected with the upper computer 202, and the other end is connected with the relay protection instrument 206, the serial server 208, the device under test 212 and the programmable power supply 216, so that ethernet data interaction between the switch and each device is realized by using a network cable. The other end of the relay protection instrument 206 is connected to the device under test 212 via the connection port of the fixture 210. The other end of the serial server 208 is connected with the clamp 210, the Ethernet data sent by the upper computer 202 through the switch 204 is converted into serial data, the serial data is transmitted to the connecting port of the clamp 210, and the tested device 212 receives the serial data sent by the serial server 208 through the connecting port of the clamp 210. One end of the I/O device 214 is connected to the remote signaling input port and the remote signaling output port of the device under test 212, one end of the programmable power supply 216 is connected to one end of the switch 204, and the other end is connected to the other end of the I/O device 214 and the device under test 202, respectively.
Specifically, the I/O device 214 is provided with a switch and an indicator light, the I/O device 214 receives an input signal sent by the device under test 212 through the remote signaling output port, receives an input signal sent by the programmable power supply 216 through the remote signaling input port, and adjusts the states of the corresponding switch and indicator light according to the input signal. The programmable power supply 216 receives a power supply control instruction sent by the upper computer 202 through the switch 204, sends an input signal to the I/O device 214 according to the power supply control instruction, and supplies power to the I/O device 214 and the device under test 212.
The I/O device 214 has 32 switches and 16 indicator lights, and is connected to a remote signaling input port and a remote signaling output port of the device under test 212, and the programmable power supply 216 provides corresponding ac/dc power supplies and ac/dc analog quantities for the device under test 212 and the I/O device 214, wherein the ac/dc power supplies include dc 24V \220V, ac 220V, and the like.
further, in the test process, a blue indicator lamp arranged on the I/O device 214 is turned on for display, when the test is changed according to different selected test items, if the test does not start, the indicator lamp displays blue, the blue indicator lamp flashes in the test process, and if the test item is qualified, green and unqualified red are displayed, and specific problem information can be displayed by clicking the red indicator lamp. After the test is finished, the upper computer 202 generates an Excel file according to the original test data, processes the data, such as calculating an average value, an error and the like, compares the processed data with a standard reference value to obtain a test conclusion, and stores the test conclusion in a folder of a local specific path.
the automatic test system for the transformer relay protection equipment is further provided with a serial server, I/O equipment and a programmable power supply, one end of the serial server is connected with the output end of the switch, the other end of the serial server is connected with one section of the clamp, one end of the I/O equipment is connected with tested equipment, one end of the programmable power supply is connected with one end of the switch, and the other end of the programmable power supply is connected with the I/O equipment and the tested equipment. The host computer sends the Ethernet data to the serial server through the switch, the serial server converts the Ethernet data into serial data and transmits the serial data to the connecting port of the clamp, and the connection between the host computer and the clamp is realized by realizing the conversion between the serial data and the Ethernet data. The I/O equipment receives an opening signal sent by the tested equipment through the remote signaling output port, receives an opening signal sent by the programmable power supply through the remote signaling input port, adjusts the states of a corresponding switch and an indicator light according to the opening signal, the programmable power supply receives a power supply control instruction sent by the upper computer through the switch, sends the opening signal to the I/O equipment according to the power supply control instruction, supplies power to the I/O equipment and the tested equipment, can determine a test process in time according to the change of the indicator light of the I/O equipment, judges whether the test process is smooth or not, and adjusts in time, so that the test efficiency can be further improved.
in one embodiment, the switch is connected with the tested equipment based on the network cable, the data modification instruction sent by the upper computer is sent to the tested equipment, the tested equipment modifies the corresponding numerical value according to the data modification instruction, and the modified equipment information is fed back to the upper computer through the switch.
Specifically, the upper computer can realize the control of the tested equipment by combining the built-in XML file and the related communication protocol, and the functions of reading a fixed value range, recording an event sequence, telemetering data, remote signaling data, recording and broadcasting files, modifying fixed values and parameters and the like are included. Aiming at the condition of modifying the fixed value and the parameters, the upper computer can send a data modification instruction to the tested equipment through the switch, modify the fixed value and the parameters of the tested equipment and acquire the modified information data of the ground equipment, including the fixed value, the parameters and the like.
In the testing process, the data modification instruction can be sent to the tested equipment by the upper computer through the switch, the tested equipment modifies the corresponding numerical value according to the data modification instruction, and the modified equipment information is fed back to the upper computer through the switch without manual modification or configuration of a user, so that the testing working efficiency is improved.
all or part of each module in the automatic testing system of the transformer relay protection equipment can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In an embodiment, as shown in fig. 3, a test flow of an automatic test system for transformer relay protection devices is provided, where the test flow includes a hardware function test, an action logic test, an action precision test, and an action time test, where the hardware function test specifically includes an ethernet communication test, a serial communication test, an entry test, an analog quantity calibration test, an exit transmission test, and a time synchronization test, where:
the Ethernet communication test specifically comprises the following steps: the upper computer sends the Ethernet communication test instruction to the tested equipment through the switch, determines the communication protocol and the communication state of the tested equipment, and when the communication protocol of the upper computer is consistent with that of the tested equipment, the communication state between the upper computer and the tested equipment is normal.
The serial port communication test specifically includes: the upper computer sends the serial port communication test instruction to the tested equipment through the serial server and determines the communication state between the upper computer and the tested equipment, wherein the communication state between the upper computer and the tested equipment is normal when the RS485 and RS232 type ports of the tested equipment and the serial server are in normal communication.
The entry test specifically includes: the method comprises the steps that a user controls a switch arranged on the I/O equipment, the I/O equipment sends a corresponding switch-in signal to the tested equipment, the tested equipment generates a corresponding event sequence record according to the switch-in signal, the upper computer detects the change of the switch state of the I/O equipment, meanwhile, the corresponding event sequence record is read from the tested equipment, and when the read is successful, the switch-in test is indicated to be successful.
the analog quantity calibration test specifically comprises the following steps: the upper computer sends the analog quantity calibration instruction to the relay protection instrument, the relay protection instrument generates corresponding rated analog quantity according to the analog quantity calibration instruction, the rated analog quantity is sent to the tested device, the tested device conducts automatic calibration according to the rated analog quantity, the upper computer reads the telemetering value after the tested device completes calibration according to a preset reading period, the error of each telemetering value is calculated, and the error is compared with a preset sampling precision standard to obtain an analog quantity calibration result.
After the calibration is finished, the upper computer reads the telemetering value of the tested device, reads the telemetering value once every 5 seconds and 10 times, calculates the maximum error, compares the obtained error value with a preset sampling precision standard, and obtains a corresponding analog quantity calibration result when the error value meets the adopted precision standard.
the export transmission test specifically includes: the upper computer sends the outlet transmission test instruction to the tested equipment, the tested equipment executes the outlet transmission operation according to the outlet transmission test instruction, the upper computer reads the sequence record of the events corresponding to the outlet transmission operation process and acquires the states of the indicating lamps of the corresponding switches of the I/O equipment, and when the acquired states of the indicating lamps are consistent with the states of the corresponding switches, the outlet transmission test is passed.
the time setting test specifically comprises the following steps: the upper computer sends the time setting instruction to the tested equipment and adjusts the time to preset time, wherein the preset time can be 0 minute 0 second at 1 month, 1 day, 0 hour in 2000 years, the upper computer obtains the current time of the tested equipment after the time setting of the tested equipment, and when the current time is consistent with the time setting time, the time can be successfully adjusted according to the time setting instruction sent by the upper computer, and the time setting test is passed.
Further, the configuration of the test items can be realized by combining the hardware design of the relay protection instrument, and according to the selected test items, the configuration can be realized by a built-in XML file of the configuration system. The control of the tested equipment can be realized by combining the built-in XML file and the related communication protocol, and the control comprises the functions of reading a fixed value range, recording an event sequence, telemetering data, remote signaling data, recording and broadcasting files, modifying fixed values and parameters and the like.
The action logic test specifically comprises the following steps: the upper computer sends the action logic test instruction to the I/O equipment, the I/O equipment adjusts the states of the corresponding switch and the indicator light according to the action logic test instruction, the upper computer sets the input amount and the control words corresponding to the protection logic according to the control conditions meeting the protection logic, monitors the action state of the protection logic, verifies the correctness of the protection logic and obtains the corresponding protection logic verification result.
the upper computer monitors whether the protection executed by the equipment to be tested normally acts or not by controlling the relay protection instrument to increase the output analog quantity of the equipment to be tested, the corresponding protection analog quantity changes from the setting value of +/-10%, the equipment to be tested is controlled to quit the condition in the protection logic one by one, whether the protection acts or not is monitored, and meanwhile whether the protection logic is correct or not is verified.
The action precision test specifically comprises the following steps: the upper computer obtains relevant information of the tested equipment, the relevant information comprises a fixed value range and a step length, an action precision test instruction is sent to the tested equipment, a protection fixed value of the tested equipment is modified according to the action precision test instruction, the modified protection fixed value is input into a soft and hard pressing plate which is correspondingly protected, whether the digital quantity input condition is met is verified, and a corresponding action precision test result is obtained.
The upper computer controls the relay protection instrument to increase the output analog quantity of the tested equipment, the protected analog quantity changes from the setting value +/-10%, whether the tested equipment is protected to normally act or not is monitored, and the relay protection instrument records each action value of the tested equipment and sends the action values to the upper computer.
Specifically, the upper computer reads a related fixed value range and a step length of the tested equipment, puts the read related fixed value range and the read related fixed value step length into a corresponding soft pressing plate, remotely modifies a corresponding protection fixed value of the tested equipment, respectively sets the corresponding protection fixed value as a minimum value, a median value and a maximum value, sets the action delay as 0, puts the modified protection delay fixed value into the corresponding protection soft pressing plate, and verifies whether the corresponding digital quantity input condition is met.
Further, the test is repeated for 5 times for each action fixed value, the upper computer records the original data, the maximum error is calculated, the obtained maximum error is input into a test report, and whether the test is qualified or not is judged.
the action time test specifically comprises the following steps: and the upper computer reads the delay fixed value range and the step length of the tested equipment, sends an action time test instruction to the tested equipment, modifies the protection delay fixed value of the tested equipment, puts the modified protection delay fixed value into the corresponding protection soft and hard pressing plate, verifies whether the corresponding digital quantity input condition is met, and obtains a corresponding action time test result.
the upper computer controls the relay protection instrument to load the setting analog quantity for the tested equipment, the tested equipment acts according to the setting analog quantity, and when the setting analog quantity loaded by the relay protection instrument is increased, the relay protection instrument acts by recording the action delay of the tested equipment acting according to the added setting analog quantity and sends the recorded action delay to the upper computer.
Specifically, the upper computer reads a related delay fixed value range and a related step length of the tested equipment, puts the read related delay fixed value range and the read related step length into the corresponding soft pressing plate, remotely modifies the corresponding protection delay fixed value of the tested equipment, sets the corresponding protection delay fixed value as a minimum value, a median value and a maximum value respectively, puts the modified protection delay fixed value into the corresponding protection soft pressing plate, and verifies whether the corresponding digital quantity input condition is met.
Further, each delay fixed value is tested repeatedly for 5 times, the upper computer records the original data, the maximum error is calculated, the obtained maximum error is input into a test report, and whether the test is qualified or not is judged.
In the test process of the automatic test system for the transformer relay protection equipment, the hardware design of the relay protection instrument is integrated, a plurality of hardware function test items including Ethernet communication test, serial communication test, input test, analog quantity calibration test, output transmission test, time synchronization test and the like are set, action logic test, action precision test and action time test are also set, repeated tests are carried out on action logic, action precision and working time of protection actions, and selection and operation of different test items can realize automatic test through an XML (extensible markup language) file arranged in a configuration system, judge whether the protection actions are qualified or not, improve the test strength of the relay protection equipment, further and deeply test the functions and performance of the relay protection equipment, save the test time and improve the working efficiency.
In an embodiment, referring to fig. 3, after the hardware function test is finished, the test flow of the transformer relay protection device automation test system further includes a protection function test, where the protection function specifically includes: multi-section overcurrent protection, overvoltage protection, undervoltage protection, low-voltage protection, multi-section zero sequence protection and the like.
Specifically, the overcurrent protection means that rated current exists in the equipment, the rated current is not allowed to exceed during operation, otherwise, the corresponding equipment can be damaged, and when the current exceeds the rated current, the control equipment is automatically powered off to protect the equipment. The multi-stage overcurrent protection can be exemplified by three-stage overcurrent protection, wherein the three-stage overcurrent protection refers to instantaneous current quick-break protection (current quick-break protection or current I stage for short), time-limited current quick-break protection (current II stage), and overcurrent protection (current III stage). Instantaneous current quick-break protection: the protection range is generally set to be less than 80% of the total length of the protected line. Time-limited current quick-break protection: the protection range is 15% of the full length of the protected line or the next circuit. Overcurrent protection: the protection range is from the full length of the protected line to the full length of the next circuit.
overvoltage protection refers to a protection mode that disconnects the power supply or reduces the voltage of the controlled device when the protected line voltage exceeds a predetermined maximum value. When the line voltage drops to a critical voltage, the action of protecting the electrical appliance, called undervoltage protection, is mainly aimed at preventing the equipment from being burned out by overload. The low-voltage protection finger is connected in parallel at two ends of a power supply by a low-voltage protection relay, and can automatically trip to separate a breaker switch when the low voltage is generated.
When the three-phase current is balanced, zero-sequence current does not exist, zero-sequence current is generated when the three-phase current is unbalanced, zero-sequence protection refers to that the zero-sequence current is collected by a zero-sequence transformer, and when the zero-sequence current exceeds a certain value (set in comprehensive protection), a comprehensive protection contactor is closed, and a circuit is disconnected. The section I of the zero sequence protection is set according to the maximum zero sequence current which flows through the protection device when the single-phase short circuit at the tail end of the line is avoided, and the whole length of the line cannot be protected. The section II of the zero sequence protection is matched and set with the section I of the zero sequence protection of the adjacent line at the protection installation position, so that the whole length of the line can be protected, and the line can extend to the adjacent line. The III section of the zero sequence protection is matched with the II section of the adjacent line, and is a backup protection of I, II sections. Section IV is typically used as a backup for section III.
in the test flow of the relay protection equipment test, the test device further comprises a protection function test, specifically comprises multi-section overcurrent protection, overvoltage protection, undervoltage protection, low-voltage protection, multi-section zero sequence protection and the like, and through setting different types of protection function tests, the tests can be respectively configured according to the actual operation conditions of all components in the system, so that the performance test of the relay protection equipment is further realized.
It should be understood that, although the steps in the flowchart of fig. 3 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 3 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An automated testing system for transformer relay protection equipment, the system comprising: the system comprises a clamp, a relay protection instrument, a switch and an upper computer;
The fixture is provided with a connecting port for accessing the equipment to be tested, and the equipment to be tested is connected with one end of the relay protection equipment through the connecting port; the other end of the relay protection equipment is connected with one end of the switch; the other end of the switch is connected with the upper computer;
The upper computer sends a test instruction to the relay protection instrument through the switch, the relay protection instrument determines the output analog quantity of the tested equipment according to the test instruction and sends the output analog quantity to the tested equipment, the tested equipment acts based on the output analog quantity and feeds generated test data back to the relay protection instrument through a connecting port, the relay protection instrument generates a corresponding test result according to the test data and feeds the test result back to the upper computer through the switch, and the upper computer judges the test result and generates a corresponding test report.
2. The automated testing system of transformer relay protection equipment according to claim 1, wherein the connection ports of the fixture comprise an aviation plug, a network cable port, a claw needle and a network cable crystal head; the claw needle is connected with the aviation plug through a lead, and all the network cable ports are connected through network cables; the claw pins and the network cable crystal heads are arranged according to the layout and the size of the wiring terminals of the tested equipment.
3. The automated testing system of transformer relay protection devices of claim 2, further comprising: a serial server;
one end of the serial server is connected with the output end of the switch, and the other end of the serial server is connected with one end of the clamp;
The upper computer is used for sending the Ethernet data to the serial server through the switch, and the serial server converts the Ethernet data into serial data and transmits the serial data to the connecting port of the clamp.
4. The automated testing system of transformer relay protection devices of claim 1, further comprising I/O devices and a programmable power supply;
One end of the I/O equipment is connected with a remote signaling input port of the tested equipment and a remote signaling output port, one end of the programmable power supply is connected with one end of the switch, and the other end of the programmable power supply is respectively connected with the I/O equipment and the tested equipment;
The I/O equipment is provided with a switch and an indicator light, receives an opening signal sent by the equipment to be tested through the remote signaling output port, receives an opening signal sent by the programmable power supply through the remote signaling input port, and adjusts the states of the corresponding switch and the indicator light according to the opening signal;
The program-controlled power supply receives a power supply control instruction sent by the upper computer through the switch, sends an input signal to the I/O equipment according to the power supply control instruction, and supplies power to the I/O equipment and the equipment to be tested.
5. The automatic testing system of transformer relay protection equipment according to claim 1, wherein the switch is connected with the equipment to be tested based on a network cable, and sends a data modification instruction sent by the upper computer to the equipment to be tested, the equipment to be tested modifies a corresponding numerical value according to the data modification instruction, and feeds back modified equipment information to the upper computer through the switch.
6. The automated testing system of transformer relay protection equipment according to claim 3, wherein the test instructions comprise communication test instructions; the upper computer sends the communication test instruction to the tested equipment through the switch and determines the communication state between the upper computer and the tested equipment; or
And the upper computer sends the communication test instruction to the tested equipment through the serial server to determine the communication state between the upper computer and the tested equipment.
7. The automated testing system of transformer relay protection devices of claim 4, wherein the test instructions comprise outlet transmission test instructions;
And the upper computer sends the outlet transmission test instruction to the tested equipment, the tested equipment executes a transmission opening operation according to the outlet transmission test instruction, and the upper computer reads the sequence record of events corresponding to the transmission opening operation process and acquires the state of the indicator light of the switch corresponding to the I/O equipment.
8. The automated testing system of transformer relay protection equipment of claim 1, wherein the test instructions comprise analog calibration instructions;
The upper computer sends the analog quantity calibration instruction to the relay protection instrument, the relay protection instrument generates a corresponding rated analog quantity according to the analog quantity calibration instruction and sends the rated analog quantity to the tested device, the tested device performs automatic calibration according to the rated analog quantity, the upper computer reads the telemetering values of the tested device after calibration is completed according to a preset reading period, calculates errors of the telemetering values, and compares the errors with a preset sampling precision standard to obtain an analog quantity calibration result.
9. The automated testing system of transformer relay protection equipment according to claim 4, wherein the test instructions comprise action logic test instructions;
the upper computer sends the action logic test instruction to the I/O equipment, the I/O equipment adjusts the states corresponding to the switch and the indicator light according to the action logic test instruction, the upper computer sets the input amount and the control words corresponding to the protection logic according to the control conditions meeting the protection logic, monitors the action state of the protection logic, verifies the correctness of the protection logic, and obtains a corresponding protection logic verification result.
10. The automated testing system of claim 3, wherein the testing instructions further comprise: an action precision test instruction and an action time test instruction;
The upper computer acquires relevant information of the tested equipment, wherein the relevant information comprises a fixed value range and a step length, sends the action precision test instruction to the tested equipment, modifies a protection fixed value of the tested equipment according to the action precision test instruction, puts the modified protection fixed value into a soft and hard pressing plate which is correspondingly protected, verifies whether a digital quantity input condition is met, and obtains a corresponding action precision test result; or
And the upper computer reads the delay timing value range and the step length of the tested equipment, sends the action time test instruction to the tested equipment, modifies the protection delay timing value of the tested equipment, puts the modified protection delay timing value into a soft and hard pressing plate which is correspondingly protected, verifies whether the corresponding digital quantity input condition is met, and obtains a corresponding action time test result.
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| CN201910973942.0A CN110579666A (en) | 2019-10-14 | 2019-10-14 | automatic test system for transformer relay protection equipment |
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| CN201910973942.0A CN110579666A (en) | 2019-10-14 | 2019-10-14 | automatic test system for transformer relay protection equipment |
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| CN111693797A (en) * | 2020-04-30 | 2020-09-22 | 中国电力科学研究院有限公司 | Test method and device for transformer protection equipment |
| CN112444755A (en) * | 2020-11-18 | 2021-03-05 | 许继集团有限公司 | System and method for detecting self-checking function of power supply of relay protection device |
| CN112595917A (en) * | 2020-12-24 | 2021-04-02 | 南京蓝园精瑞电气有限公司 | Automatic detection table capable of flexibly adapting to different power equipment |
| CN112904119A (en) * | 2021-01-21 | 2021-06-04 | 广东电网能源发展有限公司 | Relay protection testing device and method thereof |
| CN114720807A (en) * | 2022-06-08 | 2022-07-08 | 广东电网有限责任公司佛山供电局 | Online regular inspection method and system for protection signals of power distribution network |
| CN115684666A (en) * | 2022-10-28 | 2023-02-03 | 国家电网有限公司 | Relay protection equipment inspection system |
| CN115684875A (en) * | 2022-10-14 | 2023-02-03 | 北京上庄燃气热电有限公司 | High-efficiency calibration platform and calibration method based on low-voltage protection measurement and control device |
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