ABB Relion 670 Series Technical Reference Manual page 627

Line differential protection ansi

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1MRK505222-UUS C

Technical reference manual

For the disconnector positions it is advisable to use (NO) a and (NC) b type contacts to

supply Disconnector Open and Closed positions but, it is also possible to use an

inverter for one of the positions.

Voltage selection for a single circuit breaker with double busbars

This function uses the binary input from the disconnectors auxiliary contacts BUS1_OP-

BUS1_CL for Bus 1, and BUS2_OP-BUS2_CL for Bus 2 to select between bus 1 and

bus 2 voltages. If the disconnector connected to bus 1 is closed and the disconnector

connected to bus 2 is opened the bus 1 voltage is used. All other combinations use the

bus 2 voltage. The outputs B1SEL and B2SEL respectively indicate the selected Bus

The function checks the fuse-failure signals for bus 1, bus 2 and line voltage

transformers. Inputs VB1OK-VB1FF supervise the fuse for Bus 1 and VB2OK-VB2FF

supervises the fuse for Bus 2. VL1OK and VL1FF supervises the fuse for the Line

voltage transformer. The inputs fail (FF) or healthy (OK) can alternatively be used

dependent on the available signal. If a fuse-failure is detected in the selected voltage

source an output signal VSELFAIL is set. This output signal is true if the selected bus

or line voltages have a fuse failure. This output as well as the function can be blocked

with the input signal BLOCK. The function logic diagram is shown in figure 311.

Relion red670