Single-Pole Tripping - GE D90 Plus Instruction Manual

Line distance protection system

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SINGLE-POLE TRIPPING

Single-pole tripping

Figure 560: Dynamic reach, high-current internal fault

Single-pole operations make use of many D90

recloser, breaker control, open pole detector, and phase selector must be fully

programmed and in-service, and either protection elements or digital inputs representing

fault detection must be available for successful operation. When single pole trip-and-

reclose is required, overall control within the relay is performed by the trip output element.

This element includes interfaces with pilot-aided schemes, the line pickup, breaker control,

and breaker failure elements. Single-pole operations are based on use of the phase

selector to identify the type of the fault, to eliminate incorrect fault identification that can

be made by distance elements in some circumstances and to provide trip initiation from

elements that are not capable of any fault type identification, such as high-set negative-

sequence directional overcurrent element. The scheme also is designed to make use of the

advantages provided by communications channels with multiple-bit capacities for fault

identification.

features. At a minimum, the trip output,

LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL

CHAPTER 15: THEORY OF OPERATION