High voltage shunt capacitor unit
Introduction:
The capacitor is a shunt capacitor unit (hereinafter referred to as capacitor) for improving power factor and grid quality in AC power system with nominal voltage above 1kV and frequency of 50 or 60Hz. The product adopts GB / T 11024.1 and DL / T 840 standards.
Features:
The capacitor is mainly composed of shell, core and impregnant. The shell is made of high quality thin steel plate and sealed and welded. The cover of the shell is welded with a lead-in sleeve, and the two sides of the shell are welded with lifting plates for handling and installation. The core is composed of several components and insulating parts connected in series and parallel. The components are made of polypropylene film as solid medium and aluminum foil as electrode plate. The shell is filled with excellent impregnant.
Technical paremeters:
For example:
BAM12—500—1W
Meaning: polypropylene film dielectric impregnated with benzyl toluene, rated voltage 12kV, rated capacity 500kvar, single phase, outdoor type shunt capacitor
Rating and main technical performance
1 rated voltage: 1.05; 3.15; 6.6 / √ 3; 6.3; 10.5 / √ 3; 10.5; 11 / √ 3; 11; 11 / 2; 12 / 2; 12 / √ 3; 12; 24 / √ 3; 24kV.
2 rated capacity: 100; 150; 200; 300; 334; 400; 417; 500; 667kvar.
3 product technical parameters (see Appendix A).
4 product and installation dimensions (see Appendix B).
5 Capacitance Deviation: the deviation between measured capacitance and rated value of capacitor shall not exceed - 5 - + 5% of rated value; for three-phase capacitor, the ratio of maximum value to minimum value measured between any two terminals shall not exceed 1.02.
6 under rated voltage and temperature of 20 ℃, the tan δ value of full film dielectric capacitor shall not exceed 0.0005.
7 the capacitor terminal can withstand the power frequency AC test voltage of 2.15 times the rated voltage for 10s.
8 for all capacitors with terminal and shell insulation, the short-time power frequency withstand voltage test and lightning impulse voltage test of insulation grade corresponding to rated voltage of capacitor in Table 1 can be withstood between terminals and shell for 10s. The capacitor with one terminal fixed to the shell shall not be tested.
Chart1 Insulation level kV
|
Capacitor rated voltage kV |
Insulation level kV |
Short time power frequency withstand voltage root mean square value (wet test / dry test) duration Short time power frequency withstand voltage root mean square value (wet test / dry test) duration 10s |
Lightning impulse voltage 1.2 ~ 5 / 50 μ s, 15 times of peak positive and negative polarity |
|
3.15 |
3 |
18/25 |
40 |
|
6.6/√3;6.3 |
6 |
23/30 |
60 |
|
10.5/√3;10.5;11/√3;11;11/2;12/2;12/√3;12 |
10 |
30/42 |
75 |
|
24;24/√3 |
20 |
50/65 |
125 |
9 overload capacity
a. Overvoltage: the capacitor shall be able to operate at the voltage levels given in Table 2. However, the over-voltage above 1.15un given in Table 2 should not exceed 500 times in the life of capacitor.
Chart 2 Allowable voltage level in operation
|
Type |
Voltage factor×UN |
Maximum duration |
Remark |
|
power frequency |
1.00 |
continuity |
Maximum average value of capacitor at any time of operation |
|
power frequency |
1.10 |
12 hours in every 24 hours |
System voltage adjustment and fluctuation |
|
power frequency |
1.15 |
30 minutes in every 24 hours |
System voltage adjustment and fluctuation |
|
power frequency |
1.20 |
5min |
Voltage rise under light load |
|
power frequency |
1.30 |
1min |
|
|
Power frequency and harmonics |
So that the current does not exceed the value given in Clause 9b |
||
b. Over current: the capacitor shall be able to operate under continuous over-current not exceeding 1.3 times of rated current of capacitor caused by fundamental overvoltage or harmonic or both. For capacitors with actual capacitance up to 1.05 times of rated capacitance, continuous over-current is allowed to reach 1.37 times of rated current.
