three-phase relay testing| Detailed introduction of technical principles

The relay protection tester is a dedicated "test" for relay protection devices. Its core principle is to simulate various normal and fault states of the power system (such as short circuits, grounding, and oscillations) through high-precision digital simulation and power amplification, injecting corresponding voltage and current signals into the protection device while receiving its action feedback to comprehensively verify the correctness of its logic, settings, and operating time.

The workflow is as follows:

1. Analog Output: The built-in digital simulator can be flexibly programmed to generate and amplify the output of simulated transient or steady-state three-phase voltage and current signals of the power system. The amplitude, phase, frequency, and harmonics can be precisely controlled.

2. Signal Injection: These "fault signals" are synchronously and accurately applied to the voltage and current input terminals of the protection device, simulating its actual operating conditions.

3. Monitoring and Verification: The device's contact actions, messages, and output times are monitored in real time. By comparing the actual action behavior and operating time with theoretical expectations, the reliability and speed of its protection function can be accurately evaluated, completing the debugging, verification, and acceptance of the protection device. Three-phase relay tester, three-phase relay protection tester,

Three-phase relay protection tester: 4-phase voltage, 3-phase current

1. Standard 4-phase voltage, 3-phase current output: Features 4-phase voltage and 3-phase current outputs, allowing for convenient combination outputs for various types of protection tests.

Each phase can output 120V, and the current (three phases in parallel) can output 120A. The 4th phase voltage, Ux, is a multi-functional voltage item,

which can be set to four different 3U0 values, or synchronized voltage, or any specific voltage value.

2. Convenient stand-alone operation: The stand-alone unit is operated via a convenient and flexible rotary mouse and a large LCD screen, displaying all information.

It can complete most on-site testing and verification work, verifying various relays and microprocessor-based protection systems,

and simulate various complex transient, permanent, and transitional faults for complete system tests. It is ready to use immediately upon power-on, offering convenient and quick operation.

3. Operation Method: Connect to a computer and run. Using a complete set of operating software on the Windows platform, it can perform various large-scale, complex, and highly automated verification tasks. It can easily test and scan various protection settings, store test data in real time, display vector diagrams, draw fault waveforms, and print reports online.

4. Powerful Software Functions: It can complete various highly automated, large-scale, and complex verification tasks, such as three-phase differential testing, plant power fast switching, standby automatic transfer testing, line protection synchronization reclosing, etc. It can easily test and scan various protection settings, perform fault return discharge, store test data in real time, display vector diagrams, and print reports online.

5. Abundant Switching Contacts: The relay protection tester has 8 input contacts and 4 pairs of dry contact outputs.

The input contacts are compatible with dry contacts and 0-250V potential contacts, and can intelligently and automatically identify them. Input and output contacts can be expanded according to user needs.

6. Large LCD Display: The machine uses a 320×240 dot matrix large-screen high-resolution graphic LCD display. All operations are set on the display screen. The operation interface and test results are displayed in Chinese, providing a clear and intuitive view.

7. Self-Protection: It adopts a rationally designed heat dissipation structure and has reliable and comprehensive protection measures, including power soft start and certain fault self-diagnosis and interlocking functions.

8. Independent Dedicated DC Power Output: The device has one dedicated 110V and 220V adjustable DC power output.

9. High Cost-Effectiveness: It is a product jointly designed across multiple disciplines, integrating advanced technological achievements from multiple fields.

It combines the performance of a large testing instrument with the price of a small testing instrument, offering a very high performance-price ratio.

AC Current Output

1. AC Current Output: Output Accuracy: 0.2 class

2. Phase Current Output (RMS): 0-40A

3. Three-phase Current Output (RMS): 0-120A

4. Permissible Long-Term Operating Value of Phase Current (RMS): 10A

5. Maximum Output Power of Phase Current: 450VA

6. Maximum Output Power of Three-phase Current: 900VA

7. Permissible Operating Time of Three-phase Current: 10s

8. Frequency Range (Fundamental): 0-1000Hz (Online), 0-300Hz (Standalone); Harmonic Order: 0-20th (Online), 0-6th (Standalone)

DC Current Output

1. Output Accuracy: 0.5 class

2. Current Output: 0-±10A per phase, 0-±30A per phase Three-in-One

3. Maximum Output Load Voltage: 20V

AC Voltage Output

1. Output Accuracy: 0.2 class

2. Phase Voltage Output (RMS): 0-120V

3. Line Voltage Output (RMS): 0-240V

4. Phase Voltage/Line Voltage Output Power: 80VA 100VA

5. Frequency Range (Fundamental): 0-1000Hz (Online) 0-300Hz (Standalone)

6. Harmonic Order: 0-20th (Online) 0-6th (Standalone)

DC Voltage Output

1. Output Accuracy: 0.5 class

2. Phase Voltage Output Amplitude: 0-±160V

3. Line Voltage Output Amplitude: 0-±320V

4. Phase Voltage/Line Voltage Output Power: 70VA 140VA

Switch Input and Time Measurement

1. Switch Input 8 Channels, Dry Contact: 1-20mA 24V

2. Potential Contact Connection: "0": 0- +6V; "1": +11V- +250V

3. Switch Output: 4 pairs DC: 220V 0.2A; AC: 220V 0.5A

4. Time Measurement: Measurement range 0.1ms - 9999s; Measurement accuracy 0.1ms

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