Product Description

The Secondary Injection Relay Test Set is designed to verify the operating characteristics and performance of protective relays by injecting controlled current and voltage signals into the relay's secondary circuits.

It is widely used during relay commissioning, routine maintenance, troubleshooting, calibration and protection system verification.

Compared with traditional manual testing methods, a modern computerized relay test set provides more accurate and repeatable control of test parameters.

Testing Functions

• Secondary current injection
• Secondary voltage injection
• AC current testing
• AC voltage testing
• DC current testing
• DC voltage testing
• Trip-time measurement
• Pickup value testing
• Dropout value testing
• Operating characteristic testing
• Phase angle testing
• Frequency testing
• Harmonic testing

Some commercial relay test sets provide automatic trip detection and high-precision digital timing functions.

Applications

Substation commissioning

Verify protection relays before energization.

Routine maintenance

Check whether relay operating characteristics remain within required limits.

Relay manufacturing

Perform production and quality-control testing.

Troubleshooting

Determine whether a protection relay responds correctly to simulated fault conditions.

Main Buyer Concerns

Accuracy

Customers want stable and precise current/voltage injection.

Portability

Field engineers often need to carry the tester into substations and switchgear rooms.

Operation

Technicians prefer clear software and automated test procedures.

Trip detection

The tester should accurately identify relay operation and measure operating time.

FAQ

What is secondary injection testing?

It is a protection test method in which controlled current and/or voltage signals are injected into the relay's secondary circuit to verify its operating characteristics.

Can it be used for field commissioning?

Yes. Portable secondary injection test sets are commonly used for commissioning and maintenance.