APCQ CAPACITOR BANKS
© 2022 Hitachi Energy. All rights reserved
1. Introduction
This manual is intended for qualified electricians that are involved in integrating, installing, operating and/or maintain-
ing an automatic capacitor bank. They are supposed to know the general electrical wiring practices, electronic compo-
nents and electrical schematic symbols.
The present manual applies to all types of APCQ capacitor banks.
2. Safety instructions
These safety instructions are intended for all work on all APCQ capacitor banks.
Neglecting these instructions can cause physical injuries and death.
All electrical installation and maintenance work on the APCQ capacitor banks should be carried out by qualified elec-
tricians.
Do not attempt to work on a powered APCQ capacitor bank.
After switching off the power supply to the APCQ capacitor bank, always wait at least 5 minutes before working on the
unit (i.e. time for the power capacitors to be discharged). Always verify by measurement that capacitors are dis-
charged.
Note: AC capacitor may be charged at higher voltage than network nominal value.
Before manipulating current transformers (CT), make sure that the secondary is short-circuited. Never open the sec-
ondary connections of a loaded CT.
You must always wear isolating gloves and eye-protection when working on electrical installations. Also make sure
that all local safety regulations are followed.
DANGER:
To ensure safe access, the power supply of each individual enclosure must be isolated before entry / open-
ing.
This equipment contains capacitors. Check for residual voltage before working inside the equipment
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