Installing The Air-Insulated Metering Panel; Installing Instrument Transformers In The Metering Panel - Siemens NXPLUS C Installation And Operating Instructions Manual

Installation
Removing the instrument
transformer compartment
cover
Removing the members
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16

Installing the air-insulated metering panel

In the air-insulated metering panel, the instrument transformers are mounted on a removable
instrument transformer cassette.
Fig. 70: Air-insulated metering panel
The direction of the current flow in the air-insulated metering panel can be from the left to the
right side of the switchgear or vice versa. The voltage transformers can be connected
upstream or downstream from the current transformers via the connecting cable.
16.1

Installing instrument transformers in the metering panel

Life-endangering voltage
Will cause death, injury or considerable property damage.
Always observe the Five Safety Rules:
➭ Isolate.
➭ Secure against reclosing.
➭ Verify safe isolation from supply.
➭ Earth and short-circuit.
➭ Cover or barrier adjacent live parts.
Damage to the switchgear due to inadequate instrument transformers!
Mount only instrument transformers which have been released by Siemens and correspond to
the following standards:
➭ Dimensions according to DIN 42600-8 for current transformers 4MA7
➭ Dimensions according to DIN 42600-9 for voltage transformers 4MR
➭ Remove the instrument transformer compartment covers in the air-insulated metering
panel, see page 185, "Removing and mounting the connection compartment covers".
➭ Remove the vertical member ① .
- Undo 2 hexagon head bolts M8 on each side in the upper area of the vertical member,
see illustration zoom ② .
- Undo 3 hexagon head bolts M8 on each side in the lower area of the vertical member,
see illustration zoom ⑤ .
- Hold the vertical member at the top, push it backwards and take it out of the instrument
transformer compartment.
Revision 02 • INSTALLATION AND OPERATING INSTRUCTIONS • NXPLUS C • 806-9004.9
① Bushing
② Connecting bars
③ Connecting cable
Voltage transformer
④
⑤ Removable instrument
transformer cassette
⑥ Current transformer
⑦ Instrument transformer
compartment cover
DANGER
NOTICE