Energizing The Relay - Siemens 7UT51 Instruction Manual

18
Field Testing and Commissioning
18.1.2

Energizing the Relay

Before energizing the relay, it must be installed for at
least two hours to ensure temperature equalization
and to avoid condensation.
1. Switch off the DC supply and the potential
transformer circuit.
2. Verify that the miniature slide switch on the front
panel is in the "Off" position.
3. Fit a DC ammeter in series with the auxiliary
power circuit using a range of 1.5 to 3 amperes.
4. Close the DC supply circuit breaker; check polarity
and magnitude of voltage at the terminals of the
unit or at the connector module.
5. Steady-state current consumption should be
insignificant. Any initial transient current is due to
charging of the storage capacitors.
6. Slide the switch on the front panel to the "On"
position. On completion of the start-up/warm-up
period, the green LED on the front comes on in 0.5
seconds and the red LED goes off after 5
seconds.
7. Slide the switch on the front panel to the "Off"
position.
8. Open the DC power supply circuit breaker.
9. Remove DC ammeter; reconnect the auxiliary
voltage leads.
10. Slide the switch on the front panel back to the
"On" position.
11. Check the direction of phase rotation at the relay
terminals (clockwise).
12. Ensure that trip circuits are disconnected from the
relay trip contacts and are left open-circuited.
Also, disconnect from external breaker failure
devices any of the relay outputs that are being
tested.
Note: All setting values should be checked again,
in case they were altered during previous
testing. Particularly check that all desired
protection functions have been Enabled
and that all desired protection functions
have been switched On in the
corresponding Settings menu.
196
Stored indications on the front plate should be reset by
pressing the "Target Reset" on the front so that from
then on, only real faults are indicated. From that
moment, the measured values of the quiescent state
are displayed. While pressing the RESET button, the
LEDs on the front will light up (except the "Blocked"
LED); thus, an LED test is performed at the same
time.
Delete stored annunciations and counters go to
Address Block 8200:
1. Enter the password (000000).
2. 8201 Resets LED memory. Using WinDIGSI, the
LED reset is found under: Options \ Device \
Reset LEDS.
3. 8202 Deletes the operational buffer storage. Using
WinDIGSI, deleting the operational buffer is found
under: Control/ Resetting Stored Data / 8202 -
Reset event log or 8203 – Reset Trip Log.
4. 8203 Deletes the fault annunciation buffer
storage. Using WinDIGSI, deleting the operational
buffer is founder under Control/ Resetting
Stored Data / 8202 - Reset event log, or 8203 –
Reset Trip Log.
5. Press the Target Reset on front panel
6. Push the Event key on the front of relay. The
display shows the beginning of the annunciation
blocks. Thus, it is possible that the measured
values for the quiescent state of the relay can be
displayed. These values had been chosen during
configuration under the Addresses 7105 and
7106.
7. Close the housing cover.
Note: Housing cover must be on relay for proper
operation.
7UT51 v3
PRIM-2330C