Microcomputer relay protection testers are key equipment used in power systems to verify the functionality and performance of relay protection devices, ensuring they operate accurately and quickly during grid faults, thereby safeguarding the safe and stable operation of the power system.
Core Functions and Application Scenarios
Microcomputer relay protection testers have comprehensive functions, capable of simulating various power system faults to conduct thorough testing of protection devices.
Routine Tests: Perform routine calibration checks for overcurrent, overvoltage, undervoltage, zero-sequence protection, etc.
Complex Protection Testing: Support complete group transmission tests for complex protection logic such as transformer differential protection, line longitudinal protection, and automatic transfer switching (fast bus transfer for auxiliary power).
Fault Playback and Analysis: Record and replay fault waveforms to analyze protection operation behavior.
Relay Testing: Test electromagnetic, integrated circuit, and microcomputer-based relays of various types.
Main Technical Features
Modern microcomputer relay protection testers typically have the following features:
High-Precision Output: Adopt DSP+FPGA main control architecture and 16-bit high-resolution DAC, resulting in low output waveform distortion and high accuracy (typically class 0.2).
Multi-Phase Current and Voltage Output: Generally support simultaneous output of 6-phase current and 6-phase voltage, meeting the needs of complex tests such as differential protection and distance protection.
User-Friendly Operation: Equipped with a color touchscreen, some models support PC connection for operation, with powerful software that can automatically generate test reports.
Safety Protection: Include multiple self-protection functions such as overcurrent, overvoltage, overheat, and short circuit. Some models also have GPS time synchronization and fiber optic interfaces for testing in digital substations.
Product Types and Specifications
Products on the market are mainly divided into two categories based on portability and functional positioning:
Portable/Handheld: Compact size, lightweight, suitable for on-site mobile operations. For example, ULKE-S903 weighs about 12.5KG, with AC current output of 3-phase 30A or 3-phase parallel 90A, comprehensive functions, meeting routine relay protection testing needs.
Youlike ULKE-S903 Relay Protection Tester
2. High-Performance/Desktop: More powerful, larger output capacity, suitable for laboratories or occasions requiring higher precision. For example, Yangzhou Tuopu Electric's TP_JK3348B, with AC current up to 3-phase 40A or 3-phase parallel 120A, higher power.
Yangzhou Tuopu Electric TP_JK3348B Relay Protection Tester
Table
Product Type AC Current Output AC Voltage Output Portability
Portable/Handheld 3-phase 30A / 3-phase parallel 90A Phase voltage 0-120V High, suitable for on-site mobile operations
High-Performance/Desktop 3-phase 40A / 3-phase parallel 120A Phase voltage 0-120V Poor, fixed use
Major Brands in the Market
Mainstream brands in the market include Wuhan Youlike, Yangzhou Tuopu, Wuhan Hezhong, Nanjing NARI, etc. While ensuring core performance, each has its own focus, such as Youlike emphasizing portability and full-feature integration, while Tuopu offers various specifications to meet different needs.
In summary, microcomputer relay protection testers are indispensable professional tools for ensuring the safe operation of power systems.
