Ymkp series self-healing low voltage parallel power capacitor

Ymkp series self-healing low voltage parallel power capacitor

Ymkp series self-healing low-voltage parallel power capacitor adopts metallized polypropylene film as medium, introduces advanced production technology, process and equipment from abroad, and organizes production according to GB / t12747-2004 and iec60831-1:1996. The products are mainly used in low-voltage power grid to reduce reactive power loss, improve power factor and improve the quality of power grid.

main features 

1. Small size and light weight

The volume and weight of the metallized polypropylene film are only 1 / 4 and 1 / 6 of the old product

2. Small loss tangent, low temperature rise and long service life

The unique design of "Gaoyun" brand power capacitor makes the active power consumed by the product itself very small, so the tangent value of the loss angle of the capacitor is ≤ 0.06%. It is far lower than the 0.2% requirement of GB / t12747-2004 standard, and the temperature rise in normal use is less than 3 ℃. Because of this, the service life of "Gaoyun" brand power capacitor is longer than other products.

3. High pressure resistance and good safety performance.

The "Gaoyun" brand power capacitor is of exquisite material selection and small design field strength. The withstand voltage between terminals is far higher than the type test requirement of 2.15un for 10 seconds, and its instantaneous breakdown voltage is generally greater than 3.5un. The product has built-in discharge resistance and over pressure isolator (explosion-proof device), and its operation and maintenance are extremely safe and reliable.

Main technical parameters

1. Rated voltage (UN): 0.25-2kvac

2. Rated output (QN): 1-50kvar

3. Capacity deviation: - 5% ~ + 10%

4. Tangent value of loss angle (Tan δ): < 0.1% (UN 50Hz 20 ℃)

5. Withstand voltage: 3000KV for 10 seconds for pole shell and products below 0.5kV; 2un + 2KV for 10 seconds for products above 0.5kV; 2.15un for 2 seconds between poles

6. Maximum allowable overvoltage: < 110% UN

7. Maximum allowable overcurrent: < 130% in

8. Self discharge characteristics: the residual voltage of the capacitor after 3 minutes of power disconnection is less than 75V

Operating environmental conditions

1. Indoor, no harmful gas and steam, no conductivity or explosive dust and no violent vibration.

2. Altitude: < 2000m

3. Ambient temperature: - 25 / b (- 25 ℃ / 45 ℃)

4. Humidity: < 85% RH

Installation and operation requirements

1. Selection of rated voltage

The rated voltage of the capacitor shall not be lower than the maximum operating voltage of the capacitor connected to the grid. When the capacitor is connected to the series reactor in order to reduce harmonics, the voltage on the capacitor terminal will be higher than the grid voltage. At this time, the capacitor with higher rated voltage shall be selected. When selecting the rated voltage, it is very important to leave a proper safety margin, because the voltage on the dielectric rises improperly, the characteristics and service life of the capacitor will be adversely affected. 2. 2. Operating temperature

Attention should be paid to the operating temperature and ambient temperature of the capacitor, because it has a great impact on the service life of the capacitor. Exceeding the upper limit temperature will accelerate the electrochemical aging of the medium. The installation site of the capacitor shall be convenient for convection and radiation to dissipate the heat generated by the capacitor. If the ambient temperature cannot meet the requirements, effective cooling measures shall be taken. If the cooling temperature cannot be improved, the capacitor specially designed or with higher rated voltage must be used.

3. Overvoltage

For high lightning over-voltage, the capacitor shall be properly protected by lightning arrester and installed as close to the capacitor as possible. When the capacitor is fixed on the motor, in order to prevent the self excitation of the motor after it is cut off from the power supply and generate a lot of voltage higher than the system voltage, it is recommended to select the rated current of the capacitor less than the no-load current of the motor, generally 90%.

4. Overcurrent

The capacitor must not be operated when the current exceeds 1.3 times the rated current. Over current may be caused by high fundamental voltage, harmonic or both. To ensure the service life of the capacitor, even if the current is within 1.3 times, it still exceeds the rated current value, please use it with caution. It is better to measure the voltage waveform and network characteristics before and after installation. When there is harmonic source (such as large rectifier, inverter, etc.), corresponding measures shall be taken to limit it according to the severity of harmonic (such as selecting series reactor)

5. Installation

1. The installation site shall be free from direct sunlight, rain and snow, and away from heat radiation sources.

2. When installing the capacitors, the mutual spacing should be greater than 30mm.

3. The outgoing terminal of the capacitor is connected with soft copper wire, and good contact is ensured.

6. Capacitor protection

1. Transient overcurrent: use cj19 series to switch capacitor contactor, or install XD1 type current limiting reactor in front of capacitor.

2. Steady state overcurrent: equipped with thermal relay for protection

7. Safety

1. Before installation, the power supply of the equipment must be cut off. If the capacitor has secondary power auxiliary power supply and is far away from it, these power supplies shall also be cut off.

2. After the power supply is cut off, it needs to wait for 5 minutes to let the capacitor discharge through the discharge resistance. Then, an insulated wire is used to short the two outgoing terminals of the capacitor to determine the complete discharge.