AEG ME09 - OPERATION; Circuit Breaker Opening Operation; WARNING; Circuit Breaker Withdrawal

1.4
1.4-04
BREAKER
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ీă
1.4.4 Circuit Breaker Opening OperaƟon
NOTICE: If the device is a breaker it will always AUTOMATICALLY
Trip on closing or being exposed to faults that exceed the values
set or installed on the installed protecƟve devices. (GT type
Electronic Trip Unit).
There are mulƟple means to open the breaker.
Manually
Using the oī PushbuƩon (Fig. 1.0N) will open the breaker.
Shunt release
Shunt releases can be installed to open the breaker. For this the
shunt releases must be energized via the secondary disconnect
(terminals).
Undervoltage release
Undervoltage releases can be installed and will open the
breaker once their power supply drops below a certain level.
AddiƟonally mulƟple in- and external breaker interlocking
faciliƟes are available that, if present and acƟve, will open the
device.
1.4.5 Circuit Breaker Withdrawal
PreparaƟon
- Neutral Pole Current Transformer
When using a ground leg current transformer (supplied with
standby ground fault), the ground leg current transformer will
be open circuited when the circuit breaker is withdrawn from its
casseƩe. Under certain circumstances, the current may sƟll Ňow
in the ground giving rise to a high induced voltage at the current
transformer secondary terminals.
Under such condiƟons, ensure a Carriage Switch is installed in
the casseƩe (see SecƟon 4.4) to allow short circuiƟng of the
current transformer secondary terminals when the circuit
breaker is withdrawn.
- Motor operator
If a motorized spring charging unit is installed
rack the breaker to the disconnect posiƟon, then
close and trip the breaker to discharge the
closing springs.
য়ߢ0WARNING
ඓԍ܏ୟഗᅙཌቄLj!ኸ๖ྺ!P!G!G!DŽ!ݴቄDžLjዷڑࣟ
ئీᅙྜඇ๥ݣă
Ensure the circuit breaker has been tripped, indicaƟng
OFF, and the main springs are fully discharged.
NF1:ဣଚگუഘ܏ୟഗ