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CBB61 Fan Capacitor Improve The Utilization Of Equipment An Important Role
- Jun 28, 2017 -

The power CBB61 Fan Capacitor is a static reactive power compensation device. Its main role is to provide reactive power to the power system, improve the power factor. The use of local reactive power compensation, can reduce the transmission line transmission current, play a line to reduce energy loss and pressure drop, improve power quality and improve the utilization of equipment an important role.

First, the protection of power CBB61 Fan Capacitors

1. Proper protection of the CBB61 Fan Capacitor bank

Such as the use of balanced or differential relay protection or the use of instantaneous over-current relay protection, for 3.15kV and above CBB61 Fan Capacitors, each CBB61 Fan Capacitor must be installed on a separate fuse, the rated current fuse should be based on the characteristics of the fuse And the inrush current to select, usually 1.5 times the rated current of the CBB61 Fan Capacitor is appropriate to prevent the CBB61 Fan Capacitor tank explosion.

2. When necessary, several protective measures

① If the voltage rise is frequent and long time, take measures to make the voltage rise of not more than 1.1 times the rated voltage.

② with the appropriate current automatic switch protection, so that the current rise of not more than 1.3 times the rated current.

③ If the CBB61 Fan Capacitor with the overhead line connection, the appropriate lightning arrester can be used for atmospheric over-voltage protection.

④ In the high-voltage network, short-circuit current exceeds 20A, and short-circuit current protection device or fuse can not reliably protect the ground short circuit, you should use single-phase short circuit protection device.

3. Correctly select the protection mode of the CBB61 Fan Capacitor bank

To ensure the safe and reliable operation of the key to the CBB61 Fan Capacitor, no matter what kind of protection, should meet the following requirements:

① protection device should have sufficient sensitivity, regardless of the CBB61 Fan Capacitor group within a single CBB61 Fan Capacitor failure, or part of the components damaged, the protection device can be reliable action.

② It is possible to selectively remove the faulty CBB61 Fan Capacitor or to check the damaged CBB61 Fan Capacitor after all the power of the CBB61 Fan Capacitor bank has been disconnected.

③ protection device can not malfunction when the CBB61 Fan Capacitor is stopped and the power system is grounded or other fault.

④ protection device should be easy to install, adjust, test and operation and maintenance.

⑤ consumption of electricity to be less, operating costs to be low.

4. CBB61 Fan Capacitors do not allow automatic reclosing devices

The opposite should be installed without pressure release automatic trip device. Mainly because the CBB61 Fan Capacitor discharge takes some time, when the CBB61 Fan Capacitor group switch trip, if immediately reclosing, the CBB61 Fan Capacitor is too late to discharge.

In the CBB61 Fan Capacitor may be remnant with the reclosing voltage polarity of the opposite charge, which will close the moment to produce a large impact current, resulting in expansion of the CBB61 Fan Capacitor shell, fuel injection or even explosion.

Second, the power CBB61 Fan Capacitor on and off

1. Power CBB61 Fan Capacitor group

Check the discharge network before using the megger.

2. When connecting and disconnecting the CBB61 Fan Capacitor bank, the following points must be considered

① When the voltage on the busbar (bus) exceeds 1.1 times the maximum permissible value of the rated voltage, it is forbidden to connect the CBB61 Fan Capacitor bank to the grid.

② In the CBB61 Fan Capacitor group 1min after the disconnection from the grid shall not be re-access, but the automatic repeat access except.

③ When the CBB61 Fan Capacitor bank is turned on and off, use a circuit breaker that can not generate dangerous overvoltages, and the rated current of the circuit breaker should not be less than 1.3 times the rated current of the CBB61 Fan Capacitor bank.

Third, the discharge of power CBB61 Fan Capacitors

1. CBB61 Fan Capacitor discharge

Discharge should be performed automatically each time it is disconnected from the grid. The terminal voltage is rapidly reduced, regardless of the CBB61 Fan Capacitor rated voltage is how much, in the CBB61 Fan Capacitor from the grid after 30s off, the terminal voltage should not exceed 65V.

2. How to protect the CBB61 Fan Capacitor bank

In order to protect the CBB61 Fan Capacitor bank, the automatic discharge device should be mounted on the load side of the CBB61 Fan Capacitor circuit breaker and is often connected directly to the CBB61 Fan Capacitor (the circuit breaker, disconnector and fuse are not allowed in the middle). A CBB61 Fan Capacitor bank with a non-dedicated discharge device.

For example, for a voltage transformer for a high-voltage CBB61 Fan Capacitor, an incandescent bulb for a low-voltage CBB61 Fan Capacitor and a CBB61 Fan Capacitor group directly connected to the motor may not be provided with a separate discharge device. When using the lamp, in order to extend the lamp life, should be appropriate to increase the number of light bulb series.

3. The CBB61 Fan Capacitor is discharged separately

Even if the CBB61 Fan Capacitor has been automatically discharged before the conductive part of the CBB61 Fan Capacitor which has been disconnected from the grid, it must be discharged with an insulated grounded metal rod and shorted to the outlet of the CBB61 Fan Capacitor.