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Capacitors,Power Quality, Harmonic filters,Powerquality, Solutions, APFC.
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Single/Three Phase High voltage
Capacitors 50 Hz / 60 Hz
From 2.4 kV To 20.70 kV
- Maximum voltage 20.70 kV
- Maximum output 750 kVAr
- All Polypropylene (APP) film dielectric
- Ultra Low Losses
- Indoor or Outdoor
- application upto 96 kVBIL
- Superior electrical performance
- Improved tank rupture characteristics.
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All the capacitors are tested to meet or exceed the requirements of applicable
IEC & IS standard.
Their low cost per kVAr makes these capacitors a simple, economical source of
reactive power on electric power systems for,
- Improving power factor
- Reducing line losses
- Decreasing voltage drop
Power capacitors can be installed
singly or in factory - assembled
switched
or unswitched banks in
- Pole mounting racks
- Substation blocks
- Metal enclosures
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Ratings
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Shreem Capacitors are rated in continuous kVAr,voltage and
Frequency for operating
within the - 20o to + 50 C ambient
temperature range. Designed to produce not less than
rated kVAr at rated voltage and frequency, they are subjected to all applicable IEC/IS
standard dielectric tests. Single - phase 50 -
through 750 kVAr capacitors will operate safely
at 135 % of kVAr rating. The 35% above name plate value includes,
- kVAr caused by excess voltage at rated frequency
- kVAr added by the harmonic voltage superimposed on the power frequency voltage.
- kVAr attributable to manufacturing tolerance.
The maximum recommended working voltage of capacitor is
110% of rated voltage.
Shreem capacitors include a
safety factor that permits them to tolerate without damage
momentary over voltages caused by switching or load changes.
Capacitor - rated frequency
is 50 Hz, kVAr output varies directly
as the ratio applied frequency to rated frequency.
Capacitors
designed to operate at other frequencies are also available.
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Capacitor Application
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Capacitor application requires an evaluation of the power system to determine.
- The kVAr needs
- The most effective location
- The necessary protection
In General Capacitors Are Installed
- At the substation : To supply the system var needs most effectively.
- At the near the load center : To obtain the optimum var supply and voltage
correction.
- At the end of the line : To achieve maximum voltage correction.
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Construction Features
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- Capacitors are protected by internal element fuses or by external
unitfuse(Fig.2)
- High grade steel tank with epoxy light gray finish for resistantto severely
corrosive atmospheres
- Wet process - porcelain bushing glazed for high strength,
- durability and
hermetically sealed to the capacitor tank.
- Internal discharge resistors that reduce terminal
voltage at 50 Volts or less within ten minutes after capacitor has been disconnected.
- Stainless Steel - nameplate containing required IS data.
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Capacitor Bank-Sizing
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Acapacitive kVAr required for improvement of power factor at a given load can be made from
the nomogram in Fig.3. However, in most cases the capacitor bank rating has to be carefully selected
after due consider-ation of rated voltage of the system, system over-voltages, harmonics in the system,
rating of series reactor if any, etc. Besides the correct sizing of the capacitor bank, the reliability
also depends on the right selection of associated equipment such as the circuit breaker, series reactor,
protective relays, etc. Above all, it is essential to check that the capacitor installation will not cause
dangerous stress to the user's system due to resonance.
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NOMOGRAM
A nomogram is used for calculating the necessary
capacitor power rating Q (kVAr), required to improve the powerfactor of a load P (kW).
Wtat is the capacitor power rating required to
increase the power factor of an installation from 0.65
to 0.97 if the load P is 1500 kW ?
From the nomogram K = 0.92 and hence
Q = 0.92 x 1500=1350 kVAr
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| Wt: |
50Kvr |
| Unit voltage | Dimensions inches |
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kV | A | B | C | D | E |
| 2.4 |
5.12 |
3.94 |
10.63 |
8.07 | 5.83 |
| 4.8 |
5.12 |
3.94 |
10.63 |
8.07 | 5.83 |
| 7.2 |
5.12 |
3.94 |
10.63 |
8.07 | 5.83 |
| 7.62 |
4.73 |
3.94 |
10.63 |
8.07 | 5.83 |
| 13.28 |
5.12 |
3.94 |
10.63 |
8.07 | 5.83 |
| 19.92 |
5.32 |
3.94 |
10.63 |
8.07 | 5.83 |
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| Wt: |
100Kvr |
| Unit voltage | Dimensions inches |
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kV | A | B | C | D | E |
| 2.4 |
8.27 | 7.87 | 14.57 | 8.7 | 5.83 |
| 4.8 |
8.27 | 7.87 | 14.57 | 8.7 | 5.83 |
| 7.2 |
8.27 | 7.87 | 14.57 | 8.7 | 5.83 |
| 7.62 |
8.27 | 7.87 | 14.57 | 8.7 | 5.83 |
| 13.28 |
8.27 | 7.87 | 14.57 | 8.7 | 5.83 |
| 19.92 |
9.05 | 7.87 | 16.57 | 10.20 | 5.83 |
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| Wt: |
150Kvr |
| Unit voltage | Dimensions |
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kV | A | B | C | D | E |
| 2.4 |
10.83 |
8.62 |
15.31 | 8.7 | 5.83 |
| 4.8 |
10.43 |
8.62 |
15.31 | 8.7 | 5.83 |
| 7.2 |
11.81 |
8.62 |
15.31 | 8.7 | 5.83 |
| 7.62 |
10.63 |
8.62 |
15.31 | 8.7 | 5.83 |
| 13.28 |
12.60 |
8.62 |
15.31 | 8.7 | 5.83 |
| 19.92 |
12.20 |
8.62 |
15.31 | 10.20 | 5.83 |
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| Wt: |
200kVar |
| Unit voltage | Dimensions inches |
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kV | A | B | C | D | E |
| 2.4 |
14.37 |
7.12 |
13.82 | 8.7 | 5.83 |
| 4.8 |
14.37 |
7.12 |
13.82 | 8.7 | 5.83 |
| 7.2 |
13.98 |
7.12 |
13.82 | 8.7 | 5.83 |
| 7.62 |
13.98 |
7.12 |
13.82 | 8.7 | 5.83 |
| 13.28 |
14.17 |
7.12 |
13.82 | 8.7 | 5.83 |
| 19.92 |
15.75 |
7.12 |
13.82 | 10.20 | 5.83 |
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| Wt: |
300kVar |
| Unit voltage | Dimensions inches |
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kV | A | B | C | D | E |
| 2.4 |
19.29 |
8.62 |
15.31 | 8.7 | 5.83 |
| 4.8 |
19.29 |
8.62 |
15.31 | 8.7 | 5.83 |
| 7.2 |
19.68 |
8.62 |
15.31 | 8.7 | 5.83 |
| 7.62 |
18.90 |
8.62 |
15.31 | 8.7 | 5.83 |
| 13.28 |
20.47 |
8.62 |
15.31 | 8.7 | 5.83 |
| 19.92 |
21.06 |
7.75 | 16.57 | 10.20 | 5.83 |
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| Wt: |
400kVar |
| Unit voltage | Dimensions inches |
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kV | A | B | C | D | E |
| 2.4 |
24.80 |
13.38 |
20.38 |
8.07 | 5.83 |
| 4.8 |
24.80 |
13.38 |
20.38 |
8.07 | 5.83 |
| 7.2 |
25.20 |
13.38 |
20.38 |
8.07 | 5.83 |
| 7.62 |
24.21 |
13.38 |
20.38 |
8.07 | 5.83 |
| 13.28 |
25.98 |
13.38 |
20.38 |
8.07 | 5.83 |
| 19.92 |
26.18 |
12.52 |
21.34 | 10.20 | 5.83 |
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| Wt: |
500kVar |
| Unit voltage | Dimensions inches |
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kV | A | B | C | D | E |
| 2.4 | 32.68 | 7.87 | 14.57 | 8.7 | 5.83 |
| 4.8 | 32.68 | 7.87 | 14.57 | 8.7 | 5.83 |
| 7.2 | 32.68 | 7.87 | 14.57 | 8.7 | 5.83 |
| 7.62 | 31.89 | 7.87 | 14.57 | 8.7 | 5.83 |
| 13.28 | 31.89 | 7.87 | 14.57 | 8.7 | 5.83 |
| 19.92 | 36.22 | 7.87 | 16.57 | 10.20 | 5.83 |
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| Wt: |
600kVar |
| Unit voltage | Dimensions inches |
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kV | A | B | C | D | E |
| 2.4 |
38.19 | 7.87 | 14.57 | 8.7 | 5.83 |
| 4.8 |
38.19 | 7.87 | 14.57 | 8.7 | 5.83 |
| 7.2 |
39.37 | 7.87 | 14.57 | 8.7 | 5.83 |
| 7.62 |
38.19 | 7.87 | 14.57 | 8.7 | 5.83 |
| 13.28 |
38.19 | 7.87 | 14.57 | 8.7 | 5.83 |
| 19.92 |
43.70 | 7.87 | 16.57 | 10.20 | 5.83 |
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Production Graph (in MVAR )
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© Copyright 2007 Shreem Capacitors Pvt.Ltd. All Rights Reserved. Capacitors,Power Quality, Harmonic filters,Powerquality, Solutions, APFC.
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