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1MAC050144-MB C
Section 6
Supervision functions
615 series ANSI
437
Technical Manual
Figure 230:
Incorrect connection of trip-circuit monitoring
A connection of three protection IEDs with a double pole trip circuit is shown in the
following figure. Only the IED R3 has an internal TCM circuit. In order to test the
operation of the IED R2, but not to trip the circuit breaker, the upper trip contact of the IED
R2 is disconnected, as shown in the figure, while the lower contact is still connected. When
the IED R2 operates, the coil current starts to flow through the internal resistor of the IED
R3 and the resistor burns immediately. As proven with the previous examples, both trip
contacts must operate together. Attention should also be paid for correct usage of the
trip-circuit monitoring while, for example, testing the IED.
Summary of Contents for 615 Series ANSI
Page 1: ...Relion Protection and Control 615 series ANSI Technical Manual ...
Page 2: ......
Page 29: ...1MAC050144 MB C Section 615 series ANSI 22 Technical Manual ...
Page 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
Page 485: ...Section 6 1MAC050144 MB C Supervision functions 478 615 series ANSI Technical Manual ...
Page 635: ...Section 10 1MAC050144 MB C Other functions 628 615 series ANSI Technical Manual ...
Page 711: ...Section 16 1MAC050144 MB C Glossary 704 615 series ANSI Technical Manual ...
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