High-voltage shunt capacitor is a simple, economical and reliable reactive power compensation core electrical component, used in 50Hz AC power system, mainly used to improve system power factor, improve grid power quality, reduce voltage drop, reduce power loss, enhance the transmission ability of the system, improve the efficiency of power generation, transmission and power supply. The capacitor uses full film of the surface-roughened polypropylene and PCB-free, safe and environmentally friendly insulating oil as the impregnating agent.
IEC 60871-2005, MOD "Shunt capacitors for AC power systems with a nominal voltage above 1000V"
GB/T 11024.1-2010 "Shunt capacitors for AC power systems with a nominal voltage above 1000V"
The representative meaning of the model of the capacitor is as follows
- Impregnation agent: A benzyltoluene
F diaryl ethane
- Number of phases: 1 means a single-phase capacitor; 3 means a three-phase capacitor.
- Endnote numbers: "W" means outdoor products, "G" means plateau indoor products, "WG" means plateau outdoor products, and no endnote means indoor products.
- The installation site should be free from corrosive gas and steam, conductive or explosive dust, and no violent vibration.
- The altitude of the installation site is ≤1000m.
- Ambient air temperature range: BFM type is -25/ C , BAM type is -40/ C , the letter represents the upper limit of the temperature range, see the table below for details. Users have special requirements can be specified when ordering.
| Ambient temperature, °C |
| code name |
Highest |
24h average
highest |
The highest annual average |
| A |
40 |
30 |
20 |
| B |
45 |
35 |
25 |
| C |
50 |
40 |
30 |
| D. |
55 |
45 |
35 |
| Note: These temperature values can be found in the meteorological temperature table in the installation area. |
Remarks: The capacitor temperature category for this project is -25/D.
- Technical Parameters and Features
- Three-phase rated capacity: 100kvar, 150kvar, 200kvar
- Rated voltage: 3.3kV
- The polypropylene film adopts double-sided roughened full-film manufacturing technology, which has low loss and good insulation performance. The loss tangent value at 20°C is not more than 0.02 % .
- The aluminum foil adopts edge folding technology to improve the stability and service life of the capacitor, and is welded seamlessly by machine, with low impedance, less heat generation, and small deviation, and the range does not exceed ±5% of the rated value. The ratio of the maximum value to the minimum value of the phase capacitance of a three-phase capacitor is not greater than 1.02.
- The impregnating agent adopts non-toxic and environmentally friendly insulating oil, which has small partial discharge and slow aging.
- The shell is made of high-quality steel plate bent and welded, using advanced stamping technology, smooth and beautiful, with high mechanical strength.
- Each series and parallel section of the capacitor core is equipped with a discharge resistor, and the residual voltage can drop from √2Un to below 75V within 10 minutes. In addition to power-off discharge, it can also eliminate the overvoltage caused by the action of the internal fuse.
- Overload capacity
1) Allowable voltage levels during operation:
| type |
Voltage Un |
maximum duration |
illustrate |
| power frequency |
1.00 |
continuous |
Highest average value over any period of capacitor operation |
| power frequency |
1.10 |
8h in every 24h |
Adjustment fluctuations in system voltage |
| power frequency |
1.15 |
30min every 24h |
Adjustment fluctuations in system voltage |
| power frequency |
1.20 |
5min |
Voltage boost at light load |
| power frequency |
1.30 |
1min |
| Note: Un is the rated voltage of the capacitor |
- The long-term steady-state overcurrent is 1.3 times the rated current, and for capacitors with the maximum positive deviation of the capacitance value, this overcurrent can reach 1.37 times the rated current.
- Capacitor model and drawing
- Conventional model selection
- Conventional Model Outline Drawing
| Model Specifications |
Size parameters |
Capacitance |
electric current |
| W |
h1 |
h2 |
h |
| BAM 3.3-10 0-3W _ _ _ _ |
150 |
150 |
223 |
250 |
29.2μf |
17.5A |
| BAM 3.3-15 0-3W _ _ _ _ |
150 |
150 |
223 |
300 |
43.9μf |
26.2A |
| BAM 3.3-20 0-3W _ _ _ _ |
150 |
150 |
223 |
375 |
58.5μf |
35.0A |
- When transporting and hoisting capacitors, it is strictly forbidden to lift, pull, or push the outlet bushing, so as not to cause the bushing to loosen and cause oil leakage.
- When the capacitor is transported, it should generally be carried out with packaging, especially when it is transported to a distant place. There should be a soft pad in the packaging box, and the outlet sleeve should be in an upright state without any additional mechanical stress.
- The transportation method of capacitors to the installation site is mainly road or rail transportation.
- During the transportation of capacitors, attention should be paid to the weather, and measures should be taken to prevent rain and snow.
- Capacitors should be placed vertically during transportation and moving to prevent collisions and falls.
- It is strictly forbidden to carry and move the capacitor with the porcelain sleeve as the stress point.
- The loading and unloading of the product should strictly follow the relevant national loading and unloading regulations. During the whole loading and unloading process, it should be handled with care and balanced to ensure the safety of people and equipment.
- Products that need to be stored should be stored in a dry, rainproof and dust-free house or shed after acceptance, to avoid the radiation of high-temperature heat sources and the erosion of steam and other corrosive gases. The ambient air temperature should be -40 ° C ~ +40°C range.
- During the storage period, capacitors with packing boxes should be placed according to the requirements on the packing boxes. Unpackaged capacitors should be placed upright with the casing facing upwards. Capacitors are not allowed to be stacked, and warehouses with active chemicals and corrosive materials should not be stored at the same time.
- Non-outdoor products should not be placed outdoors. If they need to be placed for a short time, they should be well packaged and padded with wooden squares, with a height of not less than 100mm.
- Capacitor installation method: vertical installation.
- When the capacitor bank is installed, the distance between each capacitor is generally not less than 60mm to ensure heat dissipation.
- Before the complete installation of capacitors, the capacitors should be distributed evenly according to the capacitance value, so that the error of capacitance value between phases after installation and between each series section of each phase is the smallest, so as to ensure the stable operation of the whole set of devices.
- During the installation of the capacitor, first use a wrench to fix the boss on the terminal block, and then use another wrench to loosen the nut on the guide rod. Oil leakage is caused by excessive force at the junction of the terminal.
- The lead-out wire of the capacitor bushing shall not directly use the hard conductive bus bar, but shall use the tinned annealed copper stranded wire.
- The arrangement of the capacitors on the mounting frame should make the nameplate outward, which is convenient for the staff to check.
- Install the external fuses according to the fuse installation instructions.
- When the user receives the capacitor, the product should be inspected for acceptance.
- Appearance inspection: Check the paint condition of the capacitor, whether the casing and outlet bushing are damaged, and whether there is oil leakage, and pay attention to the correctness of the data on the nameplate.
- If necessary, conduct a voltage test on the capacitor. The voltage test includes the AC voltage test between the poles and the AC voltage test on the pole shell.
1) Inter-electrode AC voltage test: The test voltage value is 75% or lower of the factory test voltage (2.15 times the rated voltage) and lasts for 2s.
2) Pole-to-shell AC voltage test: the test voltage value is 75% or lower of the factory test voltage, and lasts for 10s.
- Capacitance and loss test: The measured capacitance value should be consistent with the value indicated on the nameplate (considering the measurement error).
- The built-in discharge device (if any) can be tested by measuring resistance.
- After the capacitor is put into operation, it should be checked regularly according to the duty inspection system whether the capacitor is leaking oil, whether the temperature rise is too high, whether the voltage and current exceed the allowable value, and the capacitor should be taken out of operation when abnormal conditions are found.
- The ambient temperature where the capacitor is installed should be controlled below the specified maximum temperature. If it is exceeded, forced cooling should be used to reduce the temperature. If forced cooling still does not work, the capacitor should be taken out of operation.
- Regularly clean the capacitor outlet bushing, clean the installation site, and check the reliability of the conductive connection and the blown display of the external fuse.
- Before the cause of the protection action is found out, the capacitor should not be put into operation again; for the capacitor whose protection has been activated, it should be confirmed that it is in good condition before it can be put into operation again.
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