The relay protection comprehensive tester is the core equipment in the secondary field of the power system. Its application covers the entire life cycle of the device, including research and development, production, acceptance, installation, commissioning, maintenance, and technical renovation.
I. By application stage
Research and type test are conducted in a laboratory environment to verify the correctness of the principle, the completeness of the function, as well as the limit parameters of key performance indicators such as accuracy, action time, and return coefficient of the new protection device.
Factory acceptance: Before the protection device is put into operation after manufacture, comprehensive functional and performance tests are carried out to ensure that all indicators comply with the technical agreement and relevant requirements.
Field commissioning and operation
Installation and commissioning: Before the new protection device is put into operation, all logical function tests, setting value verification, and complete transmission test must be completed to verify the coordination between the device and primary equipment, other secondary equipment.
Periodic inspection: According to relevant inspection regulations, periodic inspections of the device are carried out, and all or some test items can be selected to ensure the reliability of the device’s long-term operation.
Fault inspection: After the protection device operates or shows abnormal behavior, the fault scene is reproduced through the tester to analyze the correctness of the device’s action behavior; at the same time, the performance of the repaired device is retested to confirm its recovery status.
II. By test object and function
Various relay protection devices
Line protection: Covers distance protection (impedance characteristic test), zero-sequence overcurrent protection, longitudinal differential protection (optical fiber differential test), etc.
Element protection: Includes transformer differential protection (proportional braking curve test), generator differential / loss of excitation / loss of synchronization protection, motor protection, etc.
Busbar protection: Focuses on the complex braking characteristic test of differential protection.
Automatic standby power input device (auto reclosing): Simulates various working conditions such as loss of main power supply voltage and PT disconnection to verify the accuracy of the device’s logic operation.
Automatic synchronous paralleling device: Tests the regulation ability of voltage, frequency, and phase angle, as well as the accuracy of the closing lead time.
Safety automatic device: Conducts function verification for devices such as low-frequency / low-voltage load shedding, fault separation device, etc.
Measurement instruments and equipment can calibrate or test the accuracy of devices such as fault recorders, watt-hour meters, and measurement transmitters.
Secondary system of intelligent substations (core application field)
Digital testing: Through the optical Ethernet port, based on IEC 61850 protocol (GOOSE, SV), achieve closed-loop testing with merging units, intelligent terminals, protection measurement and control devices, without the need for traditional analog wiring.
System integration testing: Verify the SV sampling synchronization between protection devices, merging units, and intelligent terminals, as well as the correctness of GOOSE interlock logic.
SCD file verification: Import the full station SCD configuration file to automatically generate test links, significantly improving the debugging efficiency of intelligent substations.
III. Relevant standards and regulations
When conducting work using the relay protection comprehensive tester, it is necessary to strictly follow national and industry standards to ensure the standardization of the testing process and the authority of the test results.
Product manufacturing and calibration standards: These standards specify the technical indicators and calibration requirements that the tester itself must meet.
GB/T 7261-2016 “Basic Test Methods for Relay Protection and Safety Automatic Devices”: As a basic standard for relay protection device testing, it stipulates general test conditions and test methods.
DL/T 624-2010 “Technical Conditions for Microcomputer Test Devices for Relay Protection”: A core product standard for relay protection testers, it clearly defines the classification, output accuracy, synchronization, function, etc. of the device, as well as the test methods and inspection rules, and is an important basis for equipment selection and acceptance. JJG (Electric Power) 01-94 “Verification Regulations for Microcomputer Test Devices for Relay Protection”: Specifies the metrological verification requirements for the tester to ensure accurate value traceability of the equipment, and the tester is required to carry out calibration work regularly in accordance with this regulation.
The on-site testing and debugging regulations of such standards clearly define the process and requirements for conducting work using the tester in the field.
DL/T 995-2016 “Verification Regulations for Relay Protection and Grid Safety Automatic Devices”: A guiding regulation for on-site verification work, stipulates the inspection items, cycles, methods, and qualified standards for various protection devices, and is the core reference basis for on-site testing work.
GB/T 14285-2006 “Technical Regulations for Relay Protection and Safety Automatic Devices”: Clearly defines the technical performance that the protection device itself needs to achieve, is the basis for protection logic design and setting values, and is also the final evaluation standard for test results.
Q/GDW 1808-2013 “Verification Regulations for Relay Protection of Intelligent Substations”: A specific verification standard for protection devices in intelligent substations, detailing the specific methods, processes, and precautions for digital testing (GOOSE, SV).
Technical specifications for intelligent substations: In response to the special requirements of intelligent substations, it makes specific provisions on the details of digital interface testing, providing detailed guidance for the testing of the secondary system of the intelligent station.
Safety regulations “Electric Power Safety Work Regulations” (Electrical Part of Power Plants and Substations): The safety guidelines for all testing work, requiring the standard arrangement of safety measures during the testing process, and strictly preventing “three errors” problems such as accidental contact, accidental wiring, and accidental setting.
Post time: Dec-19-2025