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Relay Testing :Omicron and Westinghouse CA-16

Relay Testing :Omicron and Westinghouse CA-16

Relay Testing :Omicron and Westinghouse CA-16

(OP)
I am going through relay testing of older electromechanical relays, however, we have moved to a new Omnicron system (digital test kit). I am new to the relay testing field, and new to the Omnicron equipment. I am attempting to test an older Westinghouse CA-16 Percentage Diff. Relay. The test I am having a difficult time with is the (wait for it...) Percentage differential characteristic test.

Attached is the instruction booklet for the relay.

The Bad:
I have measured the output amperage at the outputs of the test kit, and they are all reading correctly. Once connected to the relay, I am getting 1.5A through terminals 12 and 13, however, I'm telling the test kit to drive 19A. In addition, when I disconnect the outputs feeding terminals 12 and 13, and short them together, I get my 19A flow as specified. This leads me to believe that I am not setting something up correctly within the relay, as the test kit is putting out what is asked.

The Good:
When I set terminals 9 and 19 (one side of the diff)to 5A, and the other side of the diff (terms. 12 and 13) to 19A, the relay picks up (which is what is expected). The current through terminals 12 and 13 reads 19A.

When I change terms 9 and 19 to 10A, the relay makes a buzzing noise and no longer picks up. The current through the terminals at 12 and 13 now reads 1.5A instead of 19A.

Any help would be appreciated. Thanks!

-Tom

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