Primary Injection Test; Correcting Circuit Diagrams - Siemens NXPLUS C Installation And Operating Instructions Manual

Preparing the test
Performing the test
Completing the test
Performing the test
806-9004.9 • INSTALLATION AND OPERATING INSTRUCTIONS • NXPLUS C • Revision 02
Damage to the voltage indicators by test voltage!
The voltage indicators can be damaged by the test voltage during the cable test.
➭ Short-circuit the voltage indicators at the earthing points of the test sockets using short-
circuit plugs.
Fig. 128: Short-circuit plug, from Kries,
order number 2500029
➭ Switch the circuit-breaker and three-position switch to the CLOSED position at the incoming
feeder.
➭ Switch all other three-position switches to the EARTHED position.
➭ Earth the voltage transformers at the feeder over the voltage transformer isolating device.
➭ If applicable, remove the surge arresters from the busbar and the incoming feeder.
➭ Cover the coupling units of the surge arresters with surge-proof caps.
➭ Apply the power-frequency test voltage in a surge-proof way at the cable bushing using test
adapters.
✔ The test can be performed.
➭ Earth adjacent phases.
➭ Test phases L1, L2 and L3 consecutively for 60 seconds each with the rated short-duration
power-frequency voltage.
➭ Switch the voltage transformer disconnector to the CLOSED position.
➭ Install the surge arresters.
20.6

Primary injection test

A primary injection test can be performed on the panels.
To test the current transformers, switch the three-position switch of the panel to be tested to
the "EARTHED" position and the circuit-breaker to the "CLOSED" position.
After that, the test current is applied through the bushings of the cable connection against the
earthing busbar by means of a suitable test unit. Power supply can take place over one or
three phases.
After applying the test current, the secondary measuring devices and tripping systems can be
tested.
20.7

Correcting circuit diagrams

➭ Note any modifications which may have been made during installation or commissioning in
the supplied circuit diagrams.
➭ To have the modifications in the circuit diagrams included, send the corrected circuit
diagrams to the regional Siemens representative.
NOTICE
Fig. 129: Short-circuit plug, from Horstmann,
order number 51-9904-001
Installation
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