Download 4. Electrical characteristics

Specification for Tender
147024546
S
General Specification for Fixed Capacitor
Bank with Detuning Reactor for
Electrical Network up to 12KV
General presentation of CP214 SAH capacitor bank
Standards
Technical characteristics
Electrical characteristics
Operating conditions
Factory tests
Documents supplied in case of an order
Last update : 2017-06-24
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Specification for Tender
147024546
Table of contents:
1. General presentation ……………………………………………..…….................................
p. 3
2. Standards………………………………………………………………………….…………..
p. 3
3. Technical characteristics ………………………………………………………………........
p. 3
4. Electrical characteristics ……………………………………………………….……….......
p. 3
4.1 Acceptable overcurrent and overvoltage ……………………………………………….........
p. 4
4.2 Design voltage, design power and marking…………………………….................................
p. 4
4.3 Composition…………………………………………………………......................................
p. 4
4.4 General layout and single line diagram……………………………………………………....
p. 5
4.5 Enclosures……………………………………………………………………......................
p. 5
4.6 Capacitor units……………………………………………….................................................
p. 5
4.7 Reactors………………………………………………………………………….....................
p. 5
4.8 Connections……………………………………………………………………………..........
p. 6
4. 9 Quick discharge coils (optional)………………………………… …………………….....
p. 6
5. Operating conditions …………………………………………………………………….......
p. 6
5.1 Internal fault protection ……………………………………………………………………....
p. 6
5.2 Additional protections……………………………………………….....................................
p. 6
6. Factory tests …………………………………………………………………………….........
p. 6
6.1 For PROPIVAR capacitor units ……………………………………………........................
p. 6
6.2 For CP214 SAH capacitor banks ……………………………………………………............
p. 7
7. Documents …………………………………………………....................................................
p. 7
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Specification for Tender
147024546
1. General presentation
CP 214 SAH is a range of MV capacitor banks designed to be used in electrical networks up to 12kV. The
capacitor bank is made of unpainted aluminium or galvanised steel frame and panels, which is equipped with
PROPIVAR capacitors, HRC fuses and a detuning reactor.
The bank is arranged in delta connection and the HRC fuses insure the protection against capacitor internal
fault.
2. Standards
The CP 214 SAH equipment is designed, manufactured, and tested according to the relevant IEC
recommendations:
- High voltage capacitors
IEC 60871-1 & 2, BS 1650, VDE 0560, C22-2 N° 190-M1985,
- Reactors
IEC 289
- HRC Fuses
IEC 282.1, IEC 787
3. Technical characteristics
CP 214 SAH capacitor bank is made of unpainted aluminium frames and painted steel panels.
It is designed for the following installation conditions:
- indoor installation,
- altitude less than 1000m,
- average daily ambient temperature of between -25°C and +35°C, and a maximum of 40°C.
The protection degree of the enclosure is IP 23.
Available options for the enclosure:
- Door with lock for indoor type enclosure,
- Oudoor type enclosure (unpainted aluminium panels),
- Door with lock for outdoor type enclosure, (to be used with outdoor type cubicle option).
4. Electrical characteristics
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Specification for Tender
147024546
CP 214 SAH capacitor bank ranges are available for voltage up to 12kV, for 50Hz or 60Hz network.
The insulation level of equipment is as follows:
Rated voltage (Vdim)
(V)
Insulation level
(kV)
4160
6600
12000
7,2
7,2
12
Power freq.
voltage withstand
(kVrms)
20
20
28
Impulse voltage
withstand (kV
peak)
60
60
75
The tolerance on the rated power of the capacitor bank is : 0/+10%,
Capacitance variation according to temperature is : -3,5.10-4/°C.
4.1 Acceptable overcurrent and overvoltage
CP 214 SAH capacitor banks are designed for:
- 1,10 x Un overvoltage - 12 hours per day,
- 1,15 x Un power frequency overvoltage - 30 minutes per day,
- Permanent overcurrent : 1,3 x In.
4.2 Design voltage, design power and marking
According to IEC 60871 recommendations, capacitor units or capacitor banks nameplates shall indicate the
maximum power and voltage for which it is designed (Qdim & Vdim).
Our capacitor units and capacitor banks have nameplates showing these design power and design voltage
(Qdim and Vdim). Operating values can be equal or lower than these values (Qn and Vn).
The documents supplied with our medium voltage products (price lists, order forms, catalogues, …) provide
reactive power values for the most common network voltages. If the required voltage does not appear in the
tables, it is possible to make a calculation using the formulae :
Qn = (Vn/Vdim)² x Qdim
4.3 Composition
Each stage of CP 214 SAH capacitor bank includes the following components:
4.3.1 Basic components:
- Unpainted aluminium or galvanised steel cubicle, IP23, for indoor installation,
- PROPIVAR capacitor units, (1 or 2 units, depending on the rated power of the bank)
- One three -phase detuning reactors,
- Three HRC fuses.
4.3.2 The following items are available as options:
- Set of two quick discharge coils.
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Specification for Tender
147024546
4.4 General layout and single line diagram
4.5 Enclosures
The capacitor banks enclosure is made of unpainted aluminium frames and painted steel panels. The banks
are designed to include up to 2 capacitor units in delta connection.
4.6 Capacitor units
The PROPIVAR capacitor units used in CP214 SAH banks have the following characteristics:
- All film technology,
- Filled with biodegradable dielectric fluid,
- Three-phase, delta connected,
- Fitted with three epoxy resin bushings,
- Fitted with internal discharge resistors (75V / 10min).
According to IEC 60871 standard requirements, capacitor units include internal discharge resistors so that
the residual voltage is less than 75V within 10 minutes after disconnection.
4.7 Reactors
The reactors used are three-phase, dry type, with iron core and natural air cooling. The rated current is equal
or higher than 1,43 times the capacitor bank nominal current.
The inductance value is calculated so that the L-C tuning frequency is 4,3 times the fundamental frequency
value (215Hz for 50Hz network, or 258Hz for 60Hz network).
This "detuning" frequency avoid resonance risk and attenuates effect of 5th and higher harmonics.
In addition, they attenuate tremandously the peak inrush current due to capacitor bank switching (peak value
remains much lower than 100 times the nominal current of the capacitor bank, as per IEC recommendation).
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Specification for Tender
147024546
4.8 Connections
The connection supports are made of porcelain or epoxy resin. Connections are of bare copper bars.
4.9 Quick discharge coils (optional)
Quick discharge coils allow a very fast discharge time (less than 10 s).
Caution : In any case (without or with quick discharge coils), a time delay relay must be used to avoid
connection of the capacitor bank within less than 5 minutes after its disconnection, either due to automatic
control, protection tripping, voltage outage, …
5. Operating conditions
5.1 Internal fault protection
PROPIVAR capacitors have to be protected according to Rectiphase instructions.
Only HRC fuses types and ratings recommended by Rectiphase can be used for capacitor protection.
5.2 Additional protections
To provide a suitable protection level for the equipment, the capacitor bank feeder must include the
following additional protection devices:
- Short-circuit protection: recommended setting values: 3 x In / 0,1s,
- Overload protection: recommended setting values: 1,4 x In / 10s.
Important note: The circuit-breaker used to protect the capacitor bank shall have the suitable rating and must
have been specifically designed for capacitor current switching.
6. Factory tests
The reference voltage used for testing is the design voltage (Vdim). Test reports will also mention this value
which is allways higher or equal to service voltage.
Each CP 214 SAH capacitor bank manufactured by Rectiphase pass routine testing before delivery. The
factory routine tests are performed according to IEC relevant recommendations and include the following:
6.1 For PROPIVAR capacitor units
- capacitance measurement,
- loss angle measurement (tg ),
- sealing test,
- internal discharge resistor value checking,
- voltage test between terminals,
- voltage test between terminals and container.
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Specification for Tender
147024546
6.2 For CP214 SAH capacitor banks
- phase to phase capacitance measurement,
- insulation measurement,
- conformity checking.
7. Documents
The following documents are part of Rectiphase supply :
- three sets of routine test certificates (french / english),
- three sets of drawings and diagrams (french / english or french / spanish),
- one instruction manual (french / english / spanish).
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