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Operational Testing of Multiple-circuit Protective Relays

Importance of Maintaining the Reliability of Multiple-circuit Protective Relays at Power Plants

In the event of lightning strikes or ground faults, this protective equipment sends instruction signals to circuit breakers for them to trip.
The equipment must be regularly maintained so that it can do the job that it is designed to do in the moment of need. 

To verify the correct operation of the equipment, a data acquisition device must be able to do the following operations, all simultaneously:
1. Measure control signals from multiple circuits
2. Measure operating signals from multiple circuits
3. Acquire data about operating signal timing while using command signals as reference

 

A Solution with the Memory HiCorders, the MR6000 and MR8827

As protective equipment becomes more complex, the number of control circuits increases. The measurement instrument must thus be able to capture data from multiple channels. The Memory HiCorders MR6000 and MR8827 offer a solution by delivering the following five benefits:


1. Ease of Use


MR6000: Small enough to carry with one hand, intuitive touch screen

MR8827: Rugged key button design suitable for operating with gloves on





2. High-speed*, Simultaneous Sampling of Analog and Digital Signals Across Multiple Channels


MR6000:
Customize your unit combination for your protective equipment's setup 

 e.g. 128 logic channels
 e.g. 64 logic channels and 16 analog channels
* Maximum sampling speed depends on the unit in use.

MR8827:
Customize your unit combination for your protective equipment's setup 
 e.g. 32 logic channels and 32 analog channels
 e.g. 64 logic channels and 28 analog channels
* Maximum sampling speed depends on the unit in use.




3. A Rich Unit Lineup for Detecting a Wide Range of Phenomena



Rich Unit Lineup


4. Sheet Function: View Multiple Display Sheets


MR6000: Up to 16 sheets

MR8827: Up to 4 sheets







5. Time Measurement with the Numerical Calculation Function


Both the MR6000 and MR8827 can calculate the following time differences.



 

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