Secondary circuit testing equipment is a key tool for ensuring the safe, stable, and accurate operation of power systems. It is primarily used for performance testing, functional verification, and fault diagnosis of secondary circuits in power systems.
Core functions include:
Ensuring Relay Protection Reliability: By simulating fault current and voltage signals, it tests whether relay protection devices can operate accurately and quickly under set conditions, preventing the escalation of accidents due to protection failure.
Ensuring Accuracy of Energy Metering:It measures the voltage drop and load of the secondary circuits of voltage transformers (PTs) and current transformers (CTs), avoiding energy metering errors caused by excessive circuit impedance, which could affect trade settlement or energy consumption statistics.
Detecting Circuit Insulation Status: Using an insulation resistance tester, it checks the insulation resistance of the secondary circuits to ground and between phases, preventing grounding, short circuits, and other faults, ensuring the normal operation of the control system.
Verifying Equipment Connection Correctness: It verifies the polarity, transformation ratio, and on/off status of secondary wiring, ensuring the error-free transmission of control and measurement signals, and avoiding misoperation or misjudgment.
Ensuring Reliability of Relay Protection Equipment: It checks the polarity, transformation ratio, and on/off status of secondary wiring, ensuring the error-free transmission of control and measurement signals, and avoiding misoperation or misjudgment. Support for preventative maintenance and acceptance testing. Before substation commissioning or during regular maintenance, comprehensively assess the health status of the secondary system to promptly identify problems such as poor contact, aging, and interference, preventing potential issues.
Common secondary circuit testing equipment includes:
Relay protection tester
Secondary circuit resistance tester
Secondary voltage drop and load tester
Insulation resistance tester, etc.
