GE Multilin F650 - Single Setting Groups; Three Setting Groups

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5-40 F650 DIGITAL BAY CONTROLLER GEK-106310-AF

5.4 PROTECTION ELEMENTS CHAPTER 5: SETPOINTS

Zero sequence overvoltage

3 x NEUTRAL OV HIGH (59NH)

3 x NEUTRAL OV LOW (59NL)

Additional auxiliary under/overvoltage (for VX selection in auxiliary voltage)

3 x AUXILIARY OV (59X)

3 x AUXILIARY UV (27X)

Negative sequence overvoltage:

3 x NEGATIVE SEQUENCE OV (47P)

POWER

3 x FORWARD POWER (32FP)

3 x DIRECTIONAL POWER (32)

3 x WATT GND FLT HIGH (32NH)

3 x WATT GND FLT LOW (32NL)

The F650 elements incorporate also the following control elements:

1 x SETTINGS GROUP

3 x OVERFREQUENCY (81O)

3 x UNDERFREQUENCY (81U)

1 x SYNCHROCHECK(25)

1 x AUTORECLOSE (79)

1 x BREAKER FAILURE (50BF)

1 x FUSE FAILURE (VTFF)

3 x BROKEN CONDUCTOR

1 x BREAKER SETTINGS

3 x LOCKED ROTOR

8 x PULSE COUNTERS (No group concept)

20 x ANALOG COMPARATORS (No group concept)

3 x FREQUENCY RATE OF CHANGE (81 df/dt)

3 x LOAD ENCROACHMENT

Note *1: For firmware version 7.20 or above, three extra underfrequency and overfrequency elements have been added

which gives a total of 6 underfrequency and 6 overfrequency elements.

F650 elements incorporate a flexible grouping capability for protection ELEMENTS. This means that protection elements

can be used in either one of the following modes:

5.4.1.1.1 Single setting groups

In this operation mode, all protection elements can be activated and operated simultaneously.

5.4.1.1.2 Three setting groups

In this mode, protection elements are grouped in three independent tables. Only one of them is active at a given time. A

logic signal, e.g. a digital input, selects which table is active at each time, providing adaptive protection to each network

condition.