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How to connect voltage to a relay protection tester

Connect the voltage output terminals of the relay protection tester to the relay voltage coil according to color coding, ensure proper grounding, and avoid short circuits or overloads.Power Supply and Grounding

Before connecting the voltage terminals, ensure the tester is powered by a 220V AC supply and the grounding wire jack is reliably grounded to prevent damage to the instrument ( ). The tester should not be connected to a 380V three-phase AC or DC supply. Grounding is critical for safety and accurate measurements.

Voltage Terminal Connections
  • Identify the voltage output terminals on the tester panel, typically color-coded (yellow, green, red, black) ( ).
  • Connect each voltage output terminal to the corresponding relay voltage coil. For example, the yellow terminal on the tester connects to the yellow coil on the relay.
  • Ensure the polarity is correct: high potential (+) terminals (A, B, C, H) connect to the relay's high potential side, and negative terminals (-) connect to the low potential side ( ). Reversing polarity may cause incorrect detection of relay contact states.
Wiring Precautions
  • Avoid short-circuiting or overloading the voltage loop. The tester may automatically cut off power and issue an overload alarm if the voltage series resonance is overloaded ( ).
  • The current loop load should match the impedance specified in the technical parameters to prevent affecting test results.
  • Use a multimeter to verify voltage output and correct wiring before starting the test ( ).
Operational Tips
  • After wiring, set the voltage amplitude, phase, and step values according to the relay's specifications ( ).
  • For single-phase tests, phase adjustment is not required; for multi-phase tests, adjust the phase angle accordingly.
  • If an urgent issue occurs during testing, immediately turn off the power amplifier and then the main power to prevent damage ( ).
Summary
  1. Connect the tester to a 220V AC supply and ensure proper grounding.
  2. Match voltage output terminals to relay coils using color coding.
  3. Maintain correct polarity for high and low potential connections.
  4. Avoid short circuits and overloads; verify connections with a multimeter.
  5. Adjust voltage amplitude, phase, and step before starting the test. Following these steps ensures accurate relay testing and protects both the tester and the relay from damage.
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Before the test, the grounding wire jack must be reliably grounded, otherwise the device may be damaged. Then,

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After turning on the power of the instrument, turn it on. According to the color of the coil, connect the terminal of the

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