ABB RELION 620 Series Technical Manual page 458

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Protection functions

The Blocking mode setting has three blocking methods. In the "Freeze timers" mode,

the operation timer is frozen to the prevailing value, but the OPERATE output is not

deactivated when blocking is activated. In the "Block all" mode, the whole function is

blocked and the timers are reset. In the "Block OPERATE output" mode, the function

operates normally but the OPERATE output is not activated.

During an earth fault, HAEFPTOC calculates the maximum current for the current

feeder. The value is sent over an analog GOOSE to other protection relays of the

busbar in the substation. At the configuration level, all the values received over the

analog GOOSE are compared through the MAX function to find the maximum value.

The maximum value is sent back to HAEFPTOC as the I_REF_RES input. The

operation of HAEFPTOC is allowed in case I_REF_RES is lower than the locally

measured harmonics current. If I_REF_RES exceeds the locally measured

harmonics current, the operation of HAEFPTOC is blocked.

GUID-4F4792F0-B311-4EB2-8EC8-56F062592158 V1 EN

Protection scheme based on the analog GOOSE communication

with three analog GOOSE receivers

1MRS757644 F

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