10kV SVR Series Line Automatic Voltage Regulator

Engineering Case

• Typical Application: A mining enterprise in the western region

• Problem Description: The line is long and the load is heavy. The mining plant is located at the end of the line, resulting in a low voltage, with an average voltage of only about 8.4kV, which cannot meet the normal production requirements.

• Remedial Measures: As can be seen from the above table, the first four measures are not economically and feasibly suitable for voltage regulation on this line. However, the feeder automatic voltage regulator is technically feasible, economically practical, and easy to install in solving the voltage regulation of specific lines. Therefore, a SVR-2000/10-7 (0～+20%) feeder automatic voltage regulator was finally installed at the front end of the mining load to adjust the line voltage.

• Effect Analysis: After the installation of the voltage regulator, when the mining plant is in normal production, the voltage regulator operates at level 6, adjusting the voltage to around 10kV, which meets the normal production and living electricity needs of the mining plant.

Structure and working principle of The SVR Automatic Voltage Regulation

• The application and parameter setting display of the film panel and light touch button are digital, which makes the controller parameters easy to set, correct and intuitive, and the man-machine dialogue interface is good.

• The voltage signal collected by the controller is read by the CPU and compared with the set voltage (the upper limit and lower limit of the set voltage). If the deviation from the set value, the controller delays issuing the rising and lowering instructions, driving the motor of the on-load switch head to complete a switching operation of the tap switch.

• The SVR series line automatic voltage regulator controller can display the voltage and current of the regulator outlet and the oil temperature of the regulator through the controller signal acquisition port.

• The SVR series line automatic voltage regulator is equipped with overcurrent, overvoltage, overheating, and gas detection protection. It will fail to operate if the time limit is exceeded.

• The SVR series line automatic voltage regulator controller can set the time interval of the switching action and the total number of times of the switching action per day.

FAQ: HOW 10kV SVR Series Line Automatic Voltage Regulator WORKS?

The SVR line automatic voltage regulator consists of three parts: self-coupled transformer, on-load tap changer and automatic controller.

The SVR series line automatic voltage regulator consists of a self-coupled transformer with 9 taps, an on-load tap changer (OLT), and an automatic controller that tracks terminal line voltage according to load variations. The transformer comprises a main winding and a regulating coil, where each tap offers a 2.5% voltage difference between adjacent taps, providing a total regulation range of 20%. A three-phase delta-connected secondary coil serves dual purposes: eliminating third harmonics and supplying power to both the OTC switch and the controller. The primary side connects to the OTC switch at taps 1 through 9, while the load-side configuration remains fixed based on required regulation ranges. For example: -20% to +20% regulation requires connecting the load-side to tap 1 (the regulator's direct path), -5% to +15% requires tap 3, and-10% to +10% requires tap 3. The schematic diagram of the regulator's circuit structure is as follows:

The SVR line automatic voltage regulator incorporates a three-phase delta-connected balancing coil during its design, with a capacity of 25-50% of the total transformer no-load capacity. This delta-connected configuration provides a dedicated path for third-order harmonics, primarily designed to eliminate third harmonic flux. This mechanism effectively removes third harmonic components from the voltage, thereby enhancing the regulator's three-phase balance performance and surge short-circuit resistance.

What is The SVR Automatic Voltage Regulation?

The SVR Automatic Voltage Regulation Controller (hereinafter referred to as the Controller) operates by monitoring real-time voltage fluctuations in the line to activate on-load tap changers, thereby adjusting the transformer's ratio and stabilizing the line voltage between preset upper and lower limits. When the measured line voltage falls below the set lower limit, the Controller commands the on-load tap changer to step up the voltage. Conversely, when the measured voltage exceeds the upper limit, the Controller activates the on-load tap changer to step down the voltage.