ABB Relion 650 Series Technical Manual page 590

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Station communication

In 'list of recorded disturbances' (ASDU23) an information element named SOF

(status of fault) exists. This information element consists of 4 bits and indicates

Bit TP: the protection equipment has tripped during the fault

Bit TM: the disturbance data are currently being transmitted

Bit TEST: the disturbance data have been recorded during normal operation or

Bit OTEV: the disturbance data recording has been initiated by another event

The only information that is easily available is test-mode status. The other

information is always set (hard coded) to:

Recorded fault with trip. [1]

Disturbance data waiting for transmission [0]

Disturbance data initiated by other events [1]

Another information element in ASDU23 is the FAN (fault number). According to

the standard this is a number that is incremented when a protection function takes

action. FAN is equal to disturbance number, which is incremented for each

disturbance.

ASDU26 / ASDU31

When a disturbance has been selected by the master by sending ASDU24, the

protection equipment answers by sending ASDU26, which contains an information

element named NOF (number of grid faults). This number must indicate fault

number in the power system,that is, a fault in the power system with several trip

and auto-reclosing has the same NOF (while the FAN must be incremented). NOF

is just as FAN, equal to disturbance number.

Interoperability, physical layer

Electrical Interface

number of loads

Optical interface

plastic fiber

Transmission speed

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Bay control REC650 2.2 IEC

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M11874-482 v4

Technical manual