Hitachi APCQ Manual

APCQ Capacitor Banks
Installation, operation and maintenance instructions

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Contents
1. Introduction .................................................................................................................................................. 4
2. Safety instructions ....................................................................................................................................... 4
3. Upon reception ............................................................................................................................................. 5
3.1. Lifting and transportation guidelines.................................................................................................... 5
3.2. Identification tag .................................................................................................................................. 6
3.3. Storage ................................................................................................................................................ 6
3.4. Packing & unpacking ........................................................................................................................... 7
4. Products overview and description............................................................................................................ 9
4.1. APCQ capacitor bank series ............................................................................................................... 9
4.2. APCQ capacitor layouts ...................................................................................................................... 9
4.3. APCQ capacitor banks internal layout............................................................................................... 10
4.4. Power Factor Controllers................................................................................................................... 12
4.5. Power module.................................................................................................................................... 13
4.6. Thermal cutoff switch......................................................................................................................... 14
5. Installation .................................................................................................................................................. 16
5.1. Working conditions: dust, moisture and temperature ........................................................................ 16
5.2. Harmonics pollution ........................................................................................................................... 16
5.3. Mechanical installation ...................................................................................................................... 16
5.3.1. APCQ-L capacitor banks ................................................................................................... 16
5.3.2. APCQ-M and APCQ-R capacitor banks ............................................................................ 17
5.4. Electrical installation .......................................................................................................................... 17
5.4.1. Dielectric test..................................................................................................................... 17
5.4.2. Electrical connections overview......................................................................................... 17
5.4.3. Earth connection................................................................................................................ 18
5.4.4. Power cables selection...................................................................................................... 19
5.4.5. APCQ-L capacitor bank electrical connections ................................................................. 19
5.4.6. APCQ-M and APCQ-R electrical connections – Bottom entry........................................... 20
5.4.7. Auxiliary power supply....................................................................................................... 21
5.4.8. Current transformer selection ............................................................................................ 21
5.4.9. Current transformer connection......................................................................................... 22
5.4.10. Multi ratio CT and summation transformer ........................................................................ 23
5.4.11. Connection of several banks in parallel............................................................................. 24
6. Options........................................................................................................................................................ 25
6.1. Optional RVT controller ..................................................................................................................... 25
6.2. APCQ-M and APCQ-R electrical connections – Top entry (optional) ................................................ 25
6.3. Optional Circuit breaker or OT isolator switch connections............................................................... 25
6.4. Cable entry cubicle ............................................................................................................................ 27
6.5. Assembly procedure on site of a multiple APCQ cabinets assembly ................................................ 27
6.6. Seismic design .................................................................................................................................. 28
6.7. IP54 design........................................................................................................................................ 29
6.8. Wooden crates and Seaworthy packing ............................................................................................ 30
6.9. Optional IP20 internal grid for APCQ-M and APCQ-R....................................................................... 31
6.10. Optional base frame (200 mm) and flanges (base frame covers) ..................................................... 31
6.11. Optional space heater ....................................................................................................................... 32
6.12. Optional internal lamp........................................................................................................................ 33
6.13. APCQ from 350 to 550 kvar (master + slave with one connexion point)........................................... 33

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6.14. APCQ for 600 and 900 kvar (master + slaves).................................................................................. 34
7. Easy commissioning.................................................................................................................................. 35
8. Troubleshooting ......................................................................................................................................... 38
9. Maintenance................................................................................................................................................ 39
10.Spare parts.................................................................................................................................................. 41
11. Dimensions and weight ............................................................................................................................. 42
11.1. IP23 standard design......................................................................................................................... 42
11.2. IP54 standard design......................................................................................................................... 43
12.Technical specifications ............................................................................................................................ 45

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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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3. Upon reception
APCQ capacitor banks are delivered by default in carton box as per Figure 3.
As an option, APCQ-M and APCQ-R can also be delivered in wood crates / sea worthy packing as per Figure 4.
Immediately after reception, please inspect the delivery and make sure that the packing is in good conditions. Report
immediately to your HITACHI ENERGY representative any damages.
After removal of the packing (see § 3.4), check visually the exterior and interior of your APCQ capacitor bank.
Any loss or damage should be immediately notified to your HITACHI ENERGY representative.
Please also check the presence of following documentation:
– Instruction manual,
– Wiring diagram,
– RVC or RVT Quick Start manual.
3.1. Lifting and transportation guidelines
Please note that APCQ capacitor bank may weigh up to hundreds of kilograms. This is indicated on the official Pack-
ing list which is sent with the product. Care should be taken to ensure that correct handling facilities are used.
During handling and transportation, no type of shock should happen. If it’s the case, HITACHI ENERGY representa-
tive must be notified.
In their packing, APCQ-L capacitor bank must be handled by their pallet. APCQ-M and APCQ-R must be handled with
a forklift truck as per Figure 1.
When unpacked:
– APCQ-M and APCQ-R capacitor banks must be lifted by their lifting lugs as per Figure 2,
– APCQ-M and APCQ-R capacitor banks must be transported vertically without any shock,
– APCQ-L must be transported horizontally.

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Figure 1: APCQ-M and APCQ-R transportation
Figure 2: Lifting lugs
3.2. Identification tag
The APCQ capacitor bank nameplate is located on the front door, at the outside. A second similar nameplate is pre-
sent inside the cubicle.
The nameplate information should always remain readable to ensure proper identification during the whole life of the
APCQ capacitor bank. The bank nameplate includes key data like the type, the nominal voltage and frequency as well
as an HITACHI ENERGY internal article code and data as per international regulations.
3.3. Storage
The APCQ capacitor bank must be stored indoors, in a dry, dust free, non-corrosive atmosphere and protected from
vibrations or shocks.
The storage temperature must be between -20°C (or -4°F) and +60°C (or +140°F).

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3.4. Packing & unpacking
By default, APCQ-L, APCQ-M and APCQ-R capacitor banks are delivered in carton box (standard packing, as per
Figure 3 here below). Optionally, wood crates and seaworthy can be used as per Figure 4 here below.
Figure 3: APCQ box with carton standard packaging
APCQ
-L
APCQ
-M & APCQ-R
Box dimensions (including pallet) (LxWxH)
800x610x480 (mm)
720x720x2390 (mm)
Packing + APCQ Weight
< 40 kg
Max. 550 kg
Transportation
Horizontal only
Vertical only
To unpack APCQ-L capacitor bank with carton box:
– Remove the nails between the carton box and the pallet and remove the carton
– Remove fixation screws
To unpack APCQ-M and APCQ-R capacitor banks with carton box:
– Remove the carton box
– Remove fixation screws
Any damage on the packing or material must be immediately reported to your HITACHI ENERGY representative.
APCQ-L
APCQ- M and APCQ-R

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Figure 4: Example of APCQ-M and R wood crate and seaworthy packing
To unpack APCQ-M and APCQ-R capacitor banks with wood crates:
– Remove carefully the wall of the crate
– Remove the seaworthy plastic bag (if existing)
– Remove fixation screws in the pallet (if existing)
Similarly, any damage on the packing or material must be immediately reported to your Hitachi Energy representative.

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4. Products overview and description
4.1. APCQ capacitor bank series
There are 3 types of APCQ capacitor banks:
– APCQ-L: wall-mounted cubicles without reactor,
– APCQ-M: free floor-standing cubicles without reactor,
– APCQ-R: free floor-standing cubicles with reactors.
All APCQ capacitor banks are available in master execution only, equipped by default with a RVC controller (RVT as
an option).
4.2. APCQ capacitor layouts
Standard APCQ cabinet layout are as per
Figure 5below and is IP23 by default. IP54 optional design is possible, see 6.7.
Figure 5: APCQ IP23 standard layouts
Note: external layouts of APCQ-M and APCQ-R capacitor banks are identical.
APCQ-R/M
APCQ-L

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4.3. APCQ capacitor banks internal layout
Number
APCQ
-L Description
1
Fan (air outlet)
2
Auxiliary transformer
3
Auxiliary connections (current transducer)
4
Power Factor Controller (RVC by default or RVT as an option)
5
UA contactors
6
Busbar point of connection (3
-Phase)
7
QCap capacitors
8
Internal protection Plexiglas
9
Air
inlet
10
Circuit breaker (optional)
11
Thermal cutoff switch
12
Cable knock
-out
13
Temporary carton fixations to be removed during commissioning

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3
1
7
2
4
8
10
6
5
9
9
11
12
13
13
Figure 6: APCQ-L internal layout
Number
APCQ-M & APCQ-R Description
1
Fans (air outlet)
2
Auxiliary transformer (optional)
3
Auxiliary connections (current transducer)
4
Power Factor Controller (RVC by default or RVT as an option)
5
UA contactors
6
Air inlet
7
Main busbar (3
-Phase) for bottom (by default) or top cable connections
8
QCap Power Module
9
Circuit breaker (optional)
10
HRC fuses
11
Protection plexiglasses covering copper bars

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Figure 7: APCQ-M & APCQ-R internal layout
4.4. Power Factor Controllers
– RVC controller (by default if V ≤ 440V),
– RVT (optional if V ≤ 440V, otherwise provided by default).
Note: the Quick Start manual of the power factor controller is provided within the capacitor bank.
Figure 8: RVC and RVT Power Factor controllers

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4.5. Power module
Power modules are all-in-one pre-wired modules, which include capacitor, contactor, fuses, discharge resistors and
reactor (for APCQ-R). The protection plexiglasses are present by default inside all APCQ cabinets.
Figure 9: 100 kvar APCQ-M Power module
Figure 10: 50 kvar APCQ-R Power module
Ventilation system
All APCQ capacitor banks are air forced ventilated IP23 (IP54 available as an option).
APCQ
-L
APCQ
-M & APCQ-R
Fan quantity
1
2 (IP23)
1 (IP54)
Fan location
Door
Top (IP23)
Front door panel (IP54)
Air flow
117 m³/h
IP23: 2 x 240 m³/h (hot air out)
IP54: 1 x 520 m³/h (fresh air in
– door bottom) + 1 x 520
m³/h (hot air out – door top)
As a matter of protection, the bank does not operate as long as the ventilation circuit is not fed or when thermal cutoff
switch trips.
Capacitor
Contactors
Fuses
Plexiglass
Reactor
Contactor
Fuses
Capacitor
Plexiglass

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Important note: auxiliary power supply is included by default in the APCQ capacitor bank, there is no need to provide
an external power supply.
4.6. Thermal cutoff switch
Each APCQ capacitor bank cubicle includes a temperature-sensitive switch that trips the controller power supply
(hence RVC/RVT controller will be off) in case of over temperature above 60°C (or 140°F) inside the enclosure. In
such event, all the capacitors are switched off while fans keep running. Thermal cutoff switch automatically closes
when temperature goes down to normal conditions.
DANGER: When the thermal protection switches on, RVC/RVT controller is off but the capacitor bank is still
connected to the power supplies. See safety instructions and wait 5 minutes before the opening.
Figure 11: Thermal cutoff switch
Figure 12: Location of thermal cutoff switch in APCQ-L

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Figure 13: Location of thermal cutoff switch in APCQ-M and APCQ-R IP23 layout
Figure 14: Location of thermal cutoff switch in IP54 layout

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5. Installation
5.1. Working conditions: dust, moisture and temperature
The APCQ capacitor banks are for indoor installation only. Protect your APCQ capacitor banks against dust and mois-
ture and place it in a well-ventilated area where the ambient temperature doesn’t exceed the following values:
– 40°C (or 104°F) maximum,
– 35°C (or 95°F) average over 24h,
– 25°C (or 77°F) average over one year,
– Humidity: maximum 95% not condensing.
5.2. Harmonics pollution
The installation of an APCQ capacitor bank on networks polluted by harmonics requires special precautions to avoid
any risk of resonance.
In such case, consult your HITACHI ENERGY representative.
5.3. Mechanical installation
5.3.1. APCQ-L capacitor banks
– To be fixed on a wall with 3 fixation points located as per below drawing.
455
755
Figure 15: APCQ-L fixing points
– APCQ-L weight: max 30 kg,
– At least M8 screw must be used. The anchors should enable a 5 mm fixture thickness.

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5 mm
Figure 16: Anchor fixture details
– Minimum clearance at top and bottom of the APCQ-L unit is 200 mm
– Can be placed immediately side by side with other cubicles
5.3.2. APCQ-M and APCQ-R capacitor banks
– Free floor standing cubicles - minimum clearance distance at the back: 50 mm,
– Can be placed immediately side by side with other cubicles,
– Lateral panels can be removed in the only case where the cabinets are mechanically assembled together with the
mechanical interconnection kit (optional).
5.4. Electrical installation
5.4.1. Dielectric test
All APCQ capacitor banks are fully factory tested including a dielectric test between power terminals and earth (2500V
50Hz 10s).
If additional dielectric test is required on site, the following procedure should be followed:
– Short-circuit the three busbars,
– Apply between earth and short-circuited busbars 2000V 50Hz 10s.
Any damage resulting of this test should be notified immediately to your local HITACHI ENERGY representative.
Remove short circuit after the test.
5.4.2. Electrical connections overview
Each APCQ capacitor bank cubicle requires individual:
– Earth connection (M8 screws required torque = 25 NM),
– Power connection (M12 screws required torque = 86 NM),
– Current transformer (CT) connection (spring cage connections).

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5.4.3. Earth connection
– APCQ-L capacitor bank earth connection: one M6 stud located inside the bank plate next to the lower left corner.
Figure 17: Earth connection in APCQ-L
– APCQ-M and APCQ-R capacitor bank earth connections: two M8 screws located on an earthing bar (either lo-
cated on top or bottom according to top or bottom cable entry).
Figure 18: Earth connection in APCQ-M and APCQ-R for bottom cable entry
Figure 19: Earth connection in APCQ-M and APCQ-R for top cable entry

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5.4.4. Power cables selection
Cables and isolating switchgear should be rated at 1.5 times the nominal capacitor bank current rating and it should
always be coordinated with the current rating of the backup fuses.
Note: when selecting the appropriate cable, please also consider possible future extension of the equipment.
Cross section of supply cables
The standards in force in the concerned country have to be taken into consideration keeping in mind that the current
must be considered as a minimum 1.5 times the nominal current.
Master switch, fuses and circuit breaker
At the location of the APCQ bank installation, the power of the network short-circuit must be taken into consideration
to define the main connection fuses, or rating of the circuit breaker.
To disconnect the unit from the network, HITACHI ENERGY suggests preferably a circuit breaker. A 3-phase discon-
necting fuse or a 3-phase switch with fuses may nevertheless be used.
The circuit breaker should be chosen with a nominal current rating of minimum 1.5 times the rating of the APCQ ca-
pacitor bank.
However, the fuses must be calibrated at least at 1.5 times the rating current of the capacitor bank.
5.4.5. APCQ-L capacitor bank electrical connections
– Electrical connection from bottom only,
Figure 20: APCQ-L bottom entry
– Remove the knock out and pass the power cable in (no grommet provided),
– Connect earth (see 5.4.3),
– Connect the power cables to busbars,
Bar dimensions: 60x3 mm (see Figure 21).
Hole diameter: 9 mm.

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Cable connection
Figure 21: APCQ-L power cables connection to busbars
– Connect CT cables.
CT
Figure 22: APCQ-L CT connection
5.4.6. APCQ-M and APCQ-R electrical connections – Bottom entry
The APCQ-M and APCQ-R cubicles are bottom cable entry by default.
3