Carrier Receive Logic Lccrptrc (94) - ABB RELION 670 SERIES Applications Manual

Line distance protection

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1MRK 506 369-UUS -

Line distance protection REL670 2.2 ANSI

Application manual

Carrier receive logic LCCRPTRC (94)

Identification

Function description

Carrier receive logic

In the Direct transfer trip scheme, the received CR signal gives the trip to the circuit

breaker after checking certain local criteria functions in order to increase the security of

the overall tripping functionality. Carrier receive logic (LCCRPTRC, 94) checks for the

CR signals and passes the local check trip to the circuit breaker.

LCCRPTRC (94) receives the two CR signals, local criterion trip signals and releases the

trip to the circuit breaker based on the input signal status and mode of operation. There are

two modes of operation in CR channel logic. In the case of '1 out of 2' mode if any one of

the two CR is received then the trip signal coming from the local criterion is released, and

in case of '2 out of 2' mode both the CR's should be received to release the trip signal

coming from the local criterion. Both the CR signals are validated using the channel error

binary flag.

Setting guidelines

ChMode: This parameter can be set 1 out of 2 or 2 out of 2. The parameter gives the

conditions for operation of the transfer trip function, i.e. if only one CR signal is required

or of both CR signals are required for trip (in addition to local criteria). If only one channel

is available the parameter must be set 1 out of 2. If parallel channels are available 2 out of 2

gives a high degree of security but can decrease the dependability if one channel is faulted.

tOperate: Trip time is normally set maximum 0.1 s.

Negative sequence overvoltage protection LCNSPTOV (47)

Identification

Function description

Negative sequence overvoltage

Scheme communication

identification

identification

ANSI/IEEE C37.2

device number

ANSI/IEEE C37.2

device number