FD2 6.3/10/11√3KV 1.7-3.4Mvar outdoor high voltage parallel capacitor special discharge coil

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Product Description

This type of discharge coil is used in the 6-10KV AC 50Hz power system, in parallel with the power capacitor bank, and used for discharging when the power is cut off to ensure the safety of equipment and the safety of maintenance personnel.
This type of discharge coil has a body in the fuel tank. The iron core of the body is an outer iron type, which is stacked with silicon steel sheets. The primary and secondary coils are installed on the stem for line measurement or protection. There are two high-pressure bushings and four low-pressure bushings on the tank cover. The body is fixed on the box cover, and the box cover is provided with an air release valve, the whole structure is compact and the insulation is good.

Model Description

Technical parameters and structure dimensions

Product features and scope of use

1. This type of discharge coil adopts a fully sealed vertical structure with reliable sealing performance. It adopts full vacuum drying and oil injection to ensure that the insulating oil is completely isolated from the outside air. The compensation method of the insulating oil adopts a unique patented compensation technology. During the operation of the discharge coil throughout the year, the box always maintains a slight positive pressure (the highest is not more than 0.05Mpa, and the minimum is not less than 0.001Mpa)
2. All parts have good sealing performance. No maintenance or replacement of parts is required during the expected life, and it has explosion-proof function, which is a maintenance-free product.
3. The design parameters have a high starting point and a high accuracy level. The accuracy level is guaranteed at 0.9-1.3 times the rated voltage and 0-50VA rated secondary load (cos is 0.8 lag). The whole structure is reasonable, the performance is excellent, the volume is small, and the shape is beautiful.
4. The matching capacitor bank covers a wide range, which simplifies the previous cumbersome matching selection and operation.

Working conditions:

1. The ambient temperature is +40°C and -40°C, the relative humidity is 85%, the altitude does not exceed 1000 meters, and it is installed outdoors.
2. The installation site should be free of corrosive gas, steam, chemical deposits, dust, dirt and places without strong vibration.
3. The discharge coil shell must be grounded reliably.

Ordering information

The selection of the rated voltage of the capacitor must be based on the network voltage. Considering that the input of the capacitor will increase the voltage, so when selecting the rated voltage of the capacitor, it is at least 5% higher than the network voltage ; when there is a reactor in the capacitor circuit, the terminal voltage of the capacitor The ground increases with the reactance rate of the reactor in series, so when selecting the rated voltage of the capacitor, it should be determined after calculation according to the reactance rate of the reactor in the string. Capacitors are low-impedance channels of harmonics. Under harmonics, a large amount of harmonics will be injected into the capacitors to make the capacitors overcurrent or overvoltage. In addition, the capacitors will amplify the harmonics and cause resonance when they expire, endangering the safety of the power grid and making the capacitors lifespan. Therefore, capacitors with large harmonics must be used under reactors that suppress harmonics. The inrush current when the capacitor is closed can be as high as hundreds of times of the rated current of the capacitor. Therefore, the switch for switching the capacitor should choose a switch without re-breakdown. In order to suppress the closing inrush current, a reactor that suppresses the inrush current can also be connected in series. After the capacitor with internal discharge resistance is disconnected from the power supply, it can drop from the peak value of the rated voltage to below 75V within 10 minutes . be explained when. Capacitors used for line compensation should be installed at 150~200kvar in one place, and be careful not to install the capacitors on the same stage as the transformer, and do not use the same group of dropouts to prevent overshooting caused by ferromagnetic resonance when the line is not running in all phases. Current overvoltage can damage capacitors and transformers. The zinc oxide surge arrester for the protection of operating overvoltage should be selected for the zinc oxide surge arrester dedicated to the capacitor, and it is best to install it between the capacitor poles. The fuse specially used for capacitor is selected for quick-break, and the rated current should be selected according to to 1.42~1.5 times of the rated current of the capacitor. When the capacitor is directly connected to the high-voltage motor in parallel, in order to prevent self-excitation when the motor is disconnected from the power supply, causing the voltage of the capacitor terminal to rise greater than the rated value, the rated current of the capacitor must be less than 90% of the no-load current of the motor; When using Y/△ wiring, it is not allowed to connect the capacitor directly to the motor in parallel, and a special wiring method should be adopted. When the capacitor is used at an altitude higher than 1000 meters or the capacitor is used in the humid tropical zone, it should be stated when ordering. Special spe certifications or special requirements for capacitors should be specified when ordering.