ABB Relion 670 Series Applications Manual page 258

Bay control, version 2.1 ansi

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Secondary system supervision

The settings

so that they are sensitive to the fault on the voltage measurement circuit, since the voltage on

both sides are equal in the healthy condition. If

phase voltage of measured fuse group, the setting of

given according to equation 118.

Vdif Main block or Vdif Pilot alarm=

ANSI13000279 V1 EN-US

is defined as phase to neutral or phase to phase voltage dependent of the selected

ConTypeMain and ConTypePilot . If ConTypeMain and ConTypePilot are set to Ph-N than the

function performs internally the rescaling of

SealIn is set to On and the fuse failure has last for more than 5 seconds, the blocked

protection functions will remain blocked until normal voltage conditions are restored above the

VSealIn setting. The fuse failure outputs are deactivated when the normal voltage conditions are

Vdif Main block and Vdif Pilot alarm should be set low (approximately 30% of VBase )

is the desired pick up primary phase-to-

Vdif Main block and Vdif Pilot alarm will be

1MRK 511 358-UUS A

(Equation 118)

Application manual

Relion rec670