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Brief introduction to the functional characteristics of intelligent low-voltage power capacitors
- Time of issue:2018-12-13
- Views:0
Brief introduction to the functional characteristics of intelligent low-voltage power capacitors
(Summary description)Intelligent low-voltage power capacitor, it is a novel reactive power compensation device that integrates reactive power control, zero-crossing switching, compensation, communication, and multiple fault protection, referred to as smart capacitor. For the control of smart capacitors, a single-chip computer is used to sample the AC voltage and current, and the reactive power automatic compensation is controlled through operation comparison. The zero-crossing switching device is equipped to reduce the impact on the capacitor, improve the life of the capacitor
- Time of issue:2018-12-13
- Views:0
Intelligent low-voltage power capacitor, it is a novel reactive power compensation device that integrates reactive power control, zero-crossing switching, compensation, communication, and multiple fault protection, referred to as smart capacitor. For the control of smart capacitors, a single-chip computer is used to sample the AC voltage and current, and the reactive power automatic compensation is controlled through operation comparison. The zero-crossing switching device is equipped to reduce the impact on the capacitor, improve the life of the capacitor, and reduce the impact of the surge current on the power grid; Film zinc aluminum edge thickening technology has good self-healing performance, low capacity attenuation, strong impact resistance and long life. The multi-machine control is realized through communication, which greatly improves the reliability of system control. Smart capacitors have multiple protection functions such as over-voltage, under-voltage, over-current, phase loss, over-temperature, pressure, and automatic tripping of permanent faults; due to the integration of control, switching, and compensation, their volume is greatly reduced, in the same More capacity smart capacitors can be installed in the capacitor cabinet, and the installation time is shortened, which is convenient for expansion; it can be applied to the reactive power automatic compensation of concentrated, local, and on-post lines.
1. Features
1. Easy operation: Designed as a "fool man-machine interface", as long as the external wiring is correct, select the address of the slave, and it can run after power-on, without any settings.
2. Multiple series connection is simple: no matter whether the slave is withdrawn or connected, it will not affect the operation of the master. As long as the slave is hooked, it will be immediately connected to the compensation column by the master without any conditions. In this way, the multi-level connection of smart capacitors is greatly simplified. In addition to the above functional features, smart capacitors also integrate our company's unique compound switches, controllers and capacitors and other patented technologies and mature production processes, so that they have the following unique and powerful functional advantages, and truly achieve intelligence.
3. Strong anti-interference ability: the use of weak and strong electricity to separate the incoming line to prevent the interference of the primary line to the secondary signal line, greatly improving the anti-interference ability of the whole machine.
4. Prevention of reverse reactive power hazards: A permanent fault trip protection device is used. Once the intelligent capacitor is irreparable, it will automatically trip and automatically withdraw from the grid to prevent the reverse reactive power hazards caused by the fault to the grid and ensure the reactive power compensation system. Normal operation.
5. Small switching current: the use of advanced zero-crossing switching technology limits the input current to 2Ie times, greatly reducing the impact on the power grid.
6. With self-checking function: it can simulate the automatic operation of switching, and the capacitor cabinet production factory can make factory tests through the self-checking function without special equipment.
7. The capacitor has good heat dissipation: there is a certain gap between the control part and the capacitor, and the top part of the capacitor is not affected by the addition of the control part.
8. Complete protection functions: In addition to permanent fault trip protection devices, there are overvoltage, undervoltage, overcurrent, phase loss, overtemperature protection and explosion-proof pressure protection devices in the capacitor.
9. Long life of capacitors: the use of polypropylene metal film zinc and aluminum edge thickening technology has good self-healing performance, low capacity attenuation, strong impact resistance, and long life.
10. Convenient maintenance: The control part and the capacitor are separated to make maintenance convenient. If the capacitor fails, the user can also replace it.
2. Technical Parameters Technical Parameters
1. Altitude: ≤2000m;
2. Ambient temperature: -25 ~ 45 ℃
3. Relative humidity: ≤80% (when 25 ℃)
4. Environmental requirements: no harmful gas, no conductive or explosive dust, no severe mechanical vibration
5. Rated voltage: 380V ± 20% 50Hz ± 5%
6. Reactive power compensation sampling current: ≤5A
7. Input threshold: the smallest one-step capacity in the compensation system
8. Cut-off threshold: greater than the target power factor COSφ
9. Overcurrent protection: greater than 1.2 times of rated current, action after 10s
10. Overvoltage protection: greater than the set value of overvoltage, action after 5s, voltage return difference 8 ~ 10V
11. Undervoltage protection: action below 80% of rated voltage
12. Over-temperature protection: action above 70 ℃ ± 4, recovery below 60 ℃ ± 4
13. Capacitor capacity attenuation: ≤1% / year
14. Switch life: 300,000 times
15. Rated capacity: three-phase total compensation ≤ (25 + 25) kvar single-phase split compensation ≤ 3 × 7kvar
16. Power consumption: ≤4W
17. Installation size: 34 × 358 (mm)
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