Technical parameters of pole mounted reactive power compensation device
1 Overview
TBBZ column type automatic switching high voltage shunt capacitor device (hereinafter referred to as the device) is suitable for 10kV or 6kV distribution line, which is used to improve power factor, reduce line loss and improve voltage quality.
The device can be set by the user according to the needs of the line to realize the automatic switching of the shunt capacitor. At the same time, it also has the protection functions of short circuit, over-current, over-voltage and under voltage. The JCZ5 series vacuum contactor adopted has the characteristics of no bounce when closing, no re ignition when opening and long service life; high voltage shunt capacitor with internal fuse and discharge resistance; automatic controller for reactive power compensation has strong anti-interference ability and reliable performance; the device is also equipped with outdoor control power transformer. The device has compact structure and convenient installation.
2. Environmental conditions for use
2.1 ambient air temperature: upper limit + 45 ºC, lower limit - 40 ºC.
2.2 altitude: no more than 1000m.
2.3 wind speed: no more than 35m / s.
2.4 sunshine: the amplitude (maximum) is 0.1w/cm2.
2.5 earthquake: the seismic intensity shall not exceed 8 degrees.
2.6 chemical conditions: the installation site is free of harmful gases and vapors, and there is no conductive or explosive dust.
3 model meaning and main technical parameters
1 Shunt capacitor TBBZ 11 - 300 - 3W 1
2 Arrester 5wr-17 / 453
3 Open type current transformer
4 power transformer DC-2 / 10 1 set
5 pole voltage and reactive power controller  1 set
6 GPRS communication module 1 set of GPRS
7 vacuum contactor JCZ5-12d / 400A
8 protection current transformer  2 sets
9 cabinet body (stainless steel plastic spraying) 1 side
10 busbar (with color code) TMY 4 × 40 1 set
11 composite casing (through wall casing) ZW8-630 3 pieces
12 indicator light, micro break and other secondary components 1 set
4 structure and working principle
4.1 the device consists of full film high voltage shunt capacitor (with discharge resistance and internal fuse), vacuum contactor, voltage transformer, zinc oxide arrester and current transformer
Sensor, discharge coil, high voltage reactive power compensation controller, protection circuit and hardware.
4.2 the device has two types of structure: double pole installation and single pole installation. See attached figure for primary wiring.
4.3 working principle
4.3.1 the high voltage power supply of the device is connected, and the voltage transformer provides power supply to the automatic controller of high voltage reactive power compensation (hereinafter referred to as the automatic controller) and the operating mechanism of vacuum contactor
Current 100V power supply. When the voltage, power factor or operation time of the line is within the preset switching range, the automatic controller will connect the power supply of the operating mechanism to close the vacuum contactor and put the capacitor bank into the line operation. When the voltage, power factor or operation time of the line is in the cut-off range, the automatic controller will turn on the power supply of the shunt release to open the vacuum contactor and exit the operation of the capacitor bank. Thus the automatic switching of capacitor is realized, the purpose of improving power factor, reducing line loss and improving voltage quality is achieved, and reactive power reverse transmission is prevented at the same time.
4.3.2When the line voltage is higher than the setting value of overvoltage protection (1.1 ~ 1.3un), the automatic controller will delay 30s to trip the vacuum contactor and the capacitor will be out of operation.
Within the delay time, the line voltage returns to normal and the switch does not trip. After the switch trips, when the line voltage returns to normal, the automatic controller delays for 10 minutes to close the switch.