Product Overview

Compared with the traditional substation reactive power compensation device, the voltage-regulated reactive power automatic compensation device adopts a new technical concept, breaking through the traditional reactive power compensation method of switching capacitors in groups using switches such as circuit breakers and vacuum contactors. This device does not compensate reactive power by switching capacitors, but uses the principle that the capacitive reactive power output of the capacitor in reactive power compensation is proportional to the square of its terminal voltage. By adjusting the output voltage of the voltage regulator to change the terminal voltage of the fixed capacitor group, the purpose of fine reactive power compensation is achieved.

Working Principle

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The SVOR voltage-regulated reactive power automatic compensation device is mainly composed of a primary part and a secondary part.
The primary part mainly includes: disconnector, auto-voltage regulator, series reactor (in substations with serious harmonics, a reactor with a certain reactance rate must be connected in series between the auto-voltage regulator and the capacitor bank), power capacitor, discharge coil arrester, fence, etc.
The secondary part mainly includes: control panel (controller and manual operating system).
Compared with other traditional compensation devices, the SVOR voltage-regulated reactive power automatic compensation device does not compensate reactive power by changing the capacitance value C, but uses the principle that the reactive power output of the capacitor bank in reactive power compensation is proportional to the square of its terminal voltage to achieve reactive power compensation, that is:

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Although only one set of capacitors with fixed capacity is used in the whole device and the capacitance value of the capacitors remains constant during the compensation process, the output function does not change with the change of the terminal voltage.

Main parameters

Project	规格
Grid voltage (kv)	6	10(12)	35
Maximum operating voltage (kv)	7.2	12	40.5
Rated capacity (kvar)	630~6000	630~12500	630~36000
Compensation level	Level 9
Reactive power adjustment range	25%~100% Or 60%~100%
Power factor index	0.95End
Adjustment method	Voltage regulator
Adjustment system response time	12s
Control system	DSP full digital control system
Control method	Automatic/manual
Number of actions	100,000 times
Capacitor utilization	90% or more
Surge current	≤2 times
Operation overvoltage	Very small
Data transmission method	RS232,RS485,GPRS
Installation method	Indoor, outdoor, box transformer
Service life	20 years
Altitude	Altitude not higher than 2000m (special requirements must be specified when ordering)
Ambient temperature	-25℃~+45℃℃ (special requirements must be specified when ordering
Ambient humidity	At 25°C, <90%
Rated frequency	50Hz
Installation environment	No severe mechanical vibration that affects the insulation performance of the device around No harmful gas and steam, no conductive or explosive dust
Control method	With intelligent logic control function, according to voltage reactive power control mode
Protection function	With capacitor overcurrent protection, overvoltage protection, undervoltage protection, open triangle protection, voltage regulator gas and temperature protection functions
Communication method	With wireless communication module, GPRS or CDMA and other communication methods to realize the "four remote" function, users can choose one of the communication methods according to their needs
Number of phases	Three-phase
Reactance rate of reactor	5%, 6%, 12%, etc. (the appropriate reactance rate can be selected according to the actual situation on site)

Performance characteristics

● Advanced compensation technology
It breaks through the traditional reactive power compensation method of using circuit breakers and vacuum contactors to switch capacitors in groups, and solves the problems of inrush current and reignition overvoltage during the switching process.
● Real-time tracking and precise compensation
The output voltage of the voltage regulator is adjusted by the on-load tap changer, so as to change the reactive power injected into the grid by the capacitor group to dynamically compensate for reactive power. The adjustment accuracy is high and the compensation level difference is small, which can achieve nine levels or even more precise reactive power compensation.
● Safe and reliable operation
During the operation of the entire device, the voltage regulator has a small voltage difference. In addition, the connection of the transition resistor of the on-load tap changer and the leakage reactance of the voltage regulator itself almost do not generate inrush current, thus reducing the impact on the system, ensuring the safe operation of the system and improving the service life of the equipment.
● Improved equipment service life
During the reactive power compensation process, the on-load tap changer is used to complete the switching process, and the capacitor is not disconnected, which greatly extends the service life of the capacitor, avoids the generation of operating overvoltage, and improves the reliability of the complete set of equipment.
● Intelligent control
The device has a high degree of automation and can adapt to various operating modes of the main transformer of the substation. It has a friendly human-machine interface and complete protection functions. It has capacitor overcurrent, overvoltage, zero-sequence current, voltage regulator gas and temperature protection functions. It is easy to operate and has high reliability.
● On-site and remote monitoring
It has complete communication and data storage functions. It can collect real-time data and three months of historical operation data, and realize data transmission, on-site and remote monitoring through multiple communication methods such as wireless communication modules, GPRS or CDMA.
● Strong compatibility
It is not only suitable for new substations, but also particularly suitable for the transformation of old stations. In the transformation of old stations, only a voltage regulator is connected in series between the circuit breaker and the capacitor bank of the traditional reactive compensation device to transform the original first-level manual fixed compensation device into an automatic compensation device with 9-level fine reactive adjustment function. Moreover, the original compensation equipment of the substation, such as switch cabinets, reactors, capacitor banks, discharge coils, disconnectors and other equipment, can continue to be used.
● High cost performance
Under the same capacity, its cost is only 20%~30% of the static VAR compensator (SVC).