Download 1. General presentation

Specification for Tender
582726015
S
General Specification for MV Capacitor Units
General presentation of MV capacitors
Standards
Capacitors construction
Internal construction and processing
Electrical requirements
Test
Bid documentation
Last update : 2017-05-03
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Specification for Tender
582726015
Table of contents:
1. General presentation.…………..………………………………………………………...........
p. 3
2. Standards………………………………………………………………………………………
p. 3
3. Capacitors construction………………………………………………………….....................
p. 5
4. Internal construction and processing ……………………………………………………......
p. 5
5. Electrical requirements.…………………………………………………………………….....
p. 5
6. Test.…………………………………………………………………………………………......
p. 5
6.1 Routine tests.……………………………………………………………………………….......
p. 5
6.2 Type tests……………………………………………………………….……………………....
p. 5
6.3 Additional tests…………….…………………………………………..…………………….....
p. 5
7. Bid documentation.……………………………………………………….……………….......
p. 6
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Specification for Tender
582726015
1. General presentation
Medium voltage capacitor units are used in MV capacitor banks to built power factor correction systems,
and/or harmonic filtering solutions.
Complete range includes 4 types of capacitors:
- Three-phase capacitor units,
- Single-phase capacitor units, with or without internal fuses,
- Double capacitors
- Surge protection capacitors
This specification covers the requirements for individual capacitors rated up to 36kV, 50 Hz or 60 Hz used
indoors or outdoors.
Specifications referenced are based on the IEC standard.
2. Standards
Where applicable, the capacitor unit shall conform to the latest edition of the following standards:
IEC 60871-1, 2, and 4
NEMA CP-1
3. Capacitors construction
Capacitor case material shall be stainless steel suitable for outdoor use.
Capacitor case assembling shall fully TIG welded.
The complete capacitor with bushings and mounted on his brackets has to be tested to vibration according to
IEC 60068-2-6 up to 4M3.
Capacitor bushings shall be porcelain type, certified according IEC 60137 and shall be either crimped or TIG
welded to the top of the case to provide a strong, hermetically sealed system.
Capacitor bushing colour shall be light gray.
The capacitor case shall be painted gray RAL 7038. The capacitor has to be tested to salt mist according to
IEC 60068- 2-11 (with 5% NaCl for at least 672 hours) and to sulphurous atmosphere according (0,067%
SO2 for at least 30 days).
A portion of the bottom of the mounting bracket shall be left unpainted to allow proper grounding of unit to
the capacitor bank.
The bushing terminal(s) shall be M16x2.0, nickel plated brass and be equipped with a clamp-type terminal
connector to accommodate copper or aluminium conductors.
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Specification for Tender
582726015
The nameplate shall be located on the narrow side of the capacitor and contain the following information:
a) Name of manufacturer
b) Unique serial number including year of manufacture
c) Measured capacitance
d) Rated rms voltage
e) Reactive power
f) Temperature class
g) Rated frequency
h) Rated BIL
i) Indication of internal fuses or not
j) Statement that the capacitor contains an internal discharge device
k) Connection type
l) Reference standard
m) Pollution level to IEC
n) Weight
o) Impregnant type
In addition, the capacitor shall be identified as containing no PCB’s.
4. Internal construction and industrial process
Capacitor units shall be of the "all-film" design using 2 or 3 sheets of Hazy Polypropylene Film as the solid
dielectric material. Electrodes shall be made of folded aluminium foils.
In order to increase the service continuity and improve reliability of the capacitor bank, "internal fuse"
technology, as far as technically possible, have to be used for single-phase or double capacitor units.
Each capacitor shall be provided with a discharge resistor assembly to reduce the residual voltage to 75 volts
or less within 10 minutes after the capacitor is disconnected from rated voltage.
The capacitor active parts shall be assembled in a clean and controlled atmosphere (dust, humidity,
temperature) manufacturing line according to ISO 14644-1 Class level 8.
The capacitor unit shall be filled under vacuum to insure full impregnation and improved performance.
Insulating fluid shall be a non-PCB oil.
Capacitor and his process should be environmentally safe.
The capacitor has to be compliant with ROHS directive and REACH declared
5. Electrical characteristics
Capacitors shall be rated for line-to-line voltage in the event they are applied on ungrounded or poorly
grounded systems.
Capacitor units shall be capable of continuous operation over an ambient range of -40 to +55°C provided
that the following limitations are not exceeded:
a) 130% of rated voltage rms, including harmonics for 1minute
b) 130% of rated current rms, permanently, including fundamental and harmonic currents
c) Transient current up to 100x rated current
Capacitor units shall be capable of meeting the permissible overload operating conditions as specified in the
applicable Standards.
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Specification for Tender
582726015
6. Tests
The capacitors shall be of design and construction which have been validated by the type tests specified in
the applicable Standards and completed by additional tests:
Certificates have to be provided in order to ensure compliance with standards and environment.
6.1 Routine tests
Each capacitor shall be subjected to the routine tests as specified in the applicable standard.
Routine tests shall include:
a) Test of internal discharge device
b) Voltage test between terminals and container
c) Capacitance measurement under nominal voltage
d) Discharge test on internal fuses (for capacitor with internal fuses)
e) Capacitance measurement under nominal voltage (for capacitor with internal fuses)
f) Voltage test between terminals
g) Capacitance measurement under nominal voltage
h) Measurement of the tangent of the loss angle (tan (delta)) under nominal voltage
i) Test of internal discharge device
6.2 Type tests
Type tests shall include:
according to IEC 60871-1 & 4
a) Thermal stability test (see Clause 13).
b) Measurement of the tangent of the loss angle (tan (delta)) of the capacitor at elevated temperature (see
Clause 14).
c) AC voltage test between terminals and container (see Clause 15).
d) Lightning impulse voltage test between terminals and container (see Clause 16).
e) Short-circuit discharge test (see Clause 17).
f) Test of an external fuse in combination with a capacitor (see Annex C).
g) Disconnecting test on internal fuses (see 5.3 of IEC 60871-4)
h) Overvoltage cycling test according to IEC 60871-2
i) Ageing test according to IEC 60871-2:
6.3 Additional tests
Salt mist according to IEC 60068- 2-11 (with 5% NaCl for at least 672 hours)
Sulphurous atmosphere according (0,067% SO2 for at least 30 days)
Vibration test according IEC 60068-2-6 up to 3M4 level
Certificates have to be given to ensure compliance with standards and environment.
7. Bid Documentation
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Specification for Tender
582726015
Each proposal shall include the following documentation for evaluation purposes:
1. Description of capacitor units, including:
a) Number of series sections
b) Number of element per section
2. Detailled electrical data including tan (delta)
3. Outline drawings of capacitor units.
4. Capacitor weight.
5. Letter of conformity with Type test list
6. Product Environmental Profile
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