Preparing The Power-Frequency Voltage Test; Instructing The Operating Personnel; Applying Operating Voltage - Siemens 8DJH Series Installation And Operating Instructions Manual

Preparations before
switching on
Switching on the first
outgoing/incoming feeder
500-8067.9 * INSTALLATION AND OPERATING INSTRUCTIONS 8DJH * Revision 03
14.3

Preparing the power-frequency voltage test

On request, a power-frequency voltage test can be performed at site on the ready-
assembled switchgear. In this case, prepare the test as follows:
The voltage transformers as well as the surge arresters and surge limiters must
be removed.
Short-circuit the current transformers at the secondary terminals.
Protect bushings of transformers, surge arresters and surge limiters in a surge-proof
way using suitable sealing caps.
Earth the capacitive test sockets.
Now you can carry out the test.
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14.4

Instructing the operating personnel

Instruct operating personnel in theory and practice of switchgear operation.
14.5

Applying operating voltage

The operating personnel must have been instructed, the installation work checked,
and test operation must have been performed without faults.
Close all covers.
Make sure that the capacitive test sockets are covered.
Switch switching devices in feeders without connected cables to EARTHED position
and lock them, or cover the bushings with surge-proof caps.
Reset short-circuit indicators.
Now you can apply operational high voltage and put the switchgear into operation as
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described hereafter.
First, apply voltage from opposite substation, then switch feeder from OPEN to
CLOSED position.
DANGER!
Short-circuit in case of different phase sequence of the incoming feeders.
Make sure that all incoming feeders have the same phase sequence.
To check the phase sequence, use only phase comparison test units which are
adequate for HR or LRM test sockets.
Verify correct phase sequence of the next incoming feeder and switch on.
Switch on the tested incoming feeder.
The three-position switch-disconnector of the feeder to be tested must be in "OPEN"
position. The opposite substation must be de-earthed and live.
Verify correct terminal-phase connections using a phase comparison test unit at
the capacitive test sockets of the panel to be tested and a panel that has already been
connected.
Installation
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