Domestic Microcomputer Relay Protection Tester

A domestic microcomputer relay protection tester is a specialized instrument designed to test, calibrate, and verify the performance of relay protection devices in power systems.

Overview

A microcomputer relay protection tester is used to simulate various operating conditions of electrical systems, such as normal operation, short circuits, and overloads, to evaluate the response and reliability of relay protection devices. These testers are essential for ensuring that relays operate accurately and safely under critical conditions. Key FeaturesMulti-phase Output: Many domestic testers, such as the LND-802, provide four-phase voltage and three-phase current outputs, enabling testing of both traditional and modern microcomputer-based protection devices, including transformer differential protection and automatic switching devices.

High Accuracy and Stability: Advanced testers use DSP + FPGA control and high-resolution DACs to generate precise waveforms, ensuring accurate measurement of small and large currents. User Interface: Devices often feature Windows-based interfaces with TFT or LCD displays, industrial keyboards, and mouse controls, making operation intuitive and efficient. Portability: Models like TEST-750 are lightweight and portable, with robust aluminum alloy chassis, suitable for field testing.

Synchronization and GP

S: Some testers support GPS synchronization for simultaneous testing at multiple locations, enhancing accuracy in complex systems. Auxiliary Power Supply: Dedicated DC outputs (e.g., 110V/220V) allow testing of relays requiring DC power.

Applications

Protection Function Testing: Verifies correct trip values, response times, and output performance of relays, using methods such as fixed-value testing and inverse-time curve testing. Calibration and Field Testing: Portable testers are ideal for on-site calibration of over-current, over-voltage, and other protective relays.

High-

Voltage and Low-Voltage Testing: Depending on the setup, testers can handle high-voltage microcomputer protection devices or low-voltage devices via current transformers or dedicated sensors.

Technical Considerations

Signal Accuracy: Voltage, current, and frequency outputs must be precise to ensure reliable relay response evaluation. Environmental Factors: Temperature, humidity, and electromagnetic interference can affect test results, so testers are designed for stability under varying conditions. Safety: Proper grounding and careful handling are essential to prevent damage to both the tester and the protection device during testing.

Popular Domestic ModelsLND-802: High-performance, multi-phase output, DSP + FPGA control, GPS synchronization, Windows XP interface. KDJB-702: Miniaturized, modular design, high-fidelity power amplifier, supports laptop connection, suitable for complex calibration. TEST-750: Single-phase, portable, ARM-based microcomputer control, suitable for field testing of over-current and over-voltage relays.

Domestic microcomputer relay protection testers combine precision, portability, and advanced control technology, making them indispensable tools for power system maintenance, relay calibration, and safety verification.