Transformer Signals; Switchgear Signals - ABB ACS 6000 Commissioning Manual

ABB
8.3.2

Transformer Signals

8.3.3

Switchgear Signals

ACS 6000 Commissioning Manual
indicators. Lubrication unit signals are supervised by control only
when pumps are running.
2 Winding temperature signals should be tested as discribed above.
3 Cooling fans, lubrication and jack-up pumps are controlled with
binary outputs. Direction of the pumps should be checked.
4 Operation of the disk brake should be done by using test mode.
Brake is opened and closed to see correct operation. If adjusting of
the brake is needed it should be done according the manufacturer's
documentation.
Checking of transformer protection signals (digital inputs) must be done
in similar way. Oil immersed transformers may have the following
optional instrumentation giving binary signals to the ACS 6000 control:
gas relay, pressure relief valve, oil thermometer, and oil level indicator.
Dry-type transformers have normally only winding temperature
measurements. The supervision is implemented with thermistor relays.
Oil transformers may also have Pt-100 measurements for oil
temperature supervision.
Later when main circuit breaker control is checked also gas relay's
opening of main circuit breaker is tested.
From feeding switchgear there are normally three signals: two status
signals from high voltage circuit breaker and pretrip signal from MCB
overcurrent relay.
Operation of the MCB will be verified during charging test later. The
Excitation circuit breaker (ECB) can be tested manually. In most cases
there is no control signal from the ACS 6000 to the ECB and only the
drive internal excitation contactor is controlled and monitored.
1 Pull supply breaker to TEST position so that closing of the breaker
without energising transformers is possible. Close the breaker
manually, from switchgear or from ACS 6000 (if control possible).
Check the status from S800 I/O module and from AMC-table.
2 Open the breaker by activating the emergency off button on the
door of the ACS 6000. The emergency off signal, a normally closed
loop, can come from one or more pushbuttons (one button on the
door of the ACS 6000). Operation of this signal must be tested; it
gives open command to breaker.
3BHS135824 ZAB E01Rev. D
Chapter 8 - Checking I/O
47 (of 62)