What tests can a three-phase microcomputer relay protection tester perform?

The three-phase microcomputer relay protection tester is an intelligent device used in the power system field to test the performance of relay protection devices. It can perform a variety of testing tasks, including:

1. Basic Performance Testing

① Action performance testing: Simulates power system fault scenarios such as short circuits and ground faults to test the accuracy and response speed of the relay protection device, ensuring that it can quickly disconnect the faulty circuit when a fault occurs.

② Setting value verification: Outputs precise current and voltage signals to verify whether the setting values of the relay protection device match the actual operating conditions of the power system, preventing maloperation or failure to operate.

③ Time characteristic testing: Tests the action time characteristics of inverse-time relays through a variable test module, including i-t characteristics (current-time characteristics) and v-t characteristics (voltage-time characteristics), evaluating their action delay under different fault currents/voltages.

2. Complex Scenario Simulation Testing

① Actual operating condition simulation: Reproduces different power supply voltages and load changes in the power system to test the working performance of the relay protection device in a dynamic environment.

② Fault type simulation: Supports fault simulation of single-phase ground faults, two-phase short circuits, three-phase short circuits, negative sequence current, zero sequence current, etc., verifying the device’s ability to identify and handle various faults.

③ Transient process simulation: Reproduces transient processes such as system oscillation and reclosing operations through a fault simulation program, testing the stability of the device under transient disturbances.

3. Special Protection Function Testing

① Differential protection test: Automatically scans the ratio braking curve of microcomputer and digital transformer and generator-transformer group differential protection, verifying the action logic and braking characteristics of the differential protection.

② Synchronization detection test: Simulates line synchronization and grid connection scenarios to test the synchronization detection function of the relay protection device, ensuring the safety of grid connection operations.

③ Automatic transfer switch device test: For automatic transfer switch devices for backup power supplies, tests their automatic switching function and action sequence after the main power supply fails.

4. Data Recording and Analysis Testing

① Fault recording function: Records the current and voltage waveforms before and after a power system fault, providing time-series data support for fault analysis. ② Vector Diagram and Characteristic Curve Plotting: Real-time display of the vector relationship of test data, automatic generation of the protection device’s characteristic curve, assisting in the analysis of the device’s operating characteristics.

③ Test Report Generation: Supports test data storage, report printing, and online transmission, facilitating archiving and remote sharing of test results.

5. Special Function Testing

① Harmonic Output Testing: Outputs 2nd to 40th order harmonic signals to test the anti-interference capability of the relay protection device under harmonic interference.

② GPS Synchronized Trigger Test: Achieves precise time synchronization of multiple test instruments through GPS synchronization, with an error of less than 50μS, suitable for collaborative testing of distributed protection devices.

③ Digital Input/Output Interface Testing: Utilizes 8 digital input channels and 4 pairs of dry contact output interfaces to test the digital signal processing capability of the relay protection device, supporting automatic identification of dry contacts and active contacts (0-250V).

The ZCAR-702 three-phase relay protection tester comes with a large screen LCD display and a flexible and convenient rotating mouse controller. Single machine independent operation already has strong functionality and can perform most experiments, while connecting to a computer for operation has even more powerful operational capabilities. Small size and high precision. It not only has the superior performance and advanced functions of large testers, but also has the advantages of small and flexible testers, easy operation, and high reliability, with a high cost performance ratio. It is a handy tool for relay protection workers. In addition to being able to calibrate various relays (such as current, voltage, inverse time limit, power direction, impedance, differential, low cycle, synchronous, frequency, DC, intermediate, time, etc.) and microcomputer protection, it can also simulate transient, permanent, and conversion faults from single-phase to three-phase for whole group testing. It can also complete various highly automated large-scale complex verification tasks, automatically test and scan various protection settings, store test data in real time, display vector graphics, and print reports online.

Kvtester Electronics Technology Co.,Ltd. is a high-tech enterprise specializing in power testing, testing, research and development, production, and sales of testing equipment. It has been engaged in the electrical testing industry for many years, and its products are of high quality. We welcome customers to come and purchase. Service hotline: 0086-27-81778799, to learn more, visit the official website: www.kvtester.com