Three Phase Line Voltage Regulator SVR 2.5-34.5kV - China Suppliers and Factory Solutions
The actual voltage from the rated voltage of the circuit size is an important measure of power quality, also is a important guarantee of power supply reliability and voltage quality.
General
Ideally the distribution lines should to be able to keep the whole line of constant voltage, but in actual, the impedance of the distribution line will result in that the voltage of end and terminal is not same (Figure 1).
Since the line voltage can not be kept constant, when the actual voltage levels exceed the normal range of fluctuation of voltage allowed, it will seriously affect the normal use of the system and electrical equipment.
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Electric power system: Low voltage will affect the power supply equipment output, reducing supply reliability, but also affect their own economic power. Voltage drops particularly severe, even voltage collapse may occur, the frequency of loss and blackouts and other incidents.
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Electric equipment: Voltage quality have an impact on safe and economic operation of various types of equipment such as the asynchronous motor. For example, if the voltage decreases, the torque will reduce so that the slip is increased, resulting in motor temperature rise; on the contrary, high voltage leads to motor overheating and reduced efficiency.
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Lighting & Electronics: Voltage 10% lower than rated reduces incandescent light flux by 30%. Voltage 10% higher reduces lamp life by half. Low voltage also affects air conditioning, chargers, and TV signal reception.
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Power system losses: If the voltage decreases, the current increases to convey the same power, causing significantly larger system losses.
Work Principle
TVR-line voltage regulator is a special design autotransformer with on-load tap changer, it can automatically "monitoring" and smoothly adjusts the output voltage, and also guarantee the output voltage within the voltage requirement. 27 taps regulation can meet every step 0.75% regulation accuracy.
In Figure 6, is an utility sample for a factory which require 400V electric power, but the power line is not stably in the summer because the load is 120% of rated capacity, so the power to the factory is lower than 360V. After install Farady auto voltage regulator, it can adjust the power line voltage from 8038V to 11000V and keep it stable with 2% accuracy, so the power to factory can be keep at 400V (+8V accuracy).
Work Condition
(1) Altitude: Below 3000 meter (customizable)
(2) Temperature: -25°C to 65°C (customizable)
(3) Humidity: Monthly less than 90% (at 25°C)
(4) Pollution class: III class
(5) Rating voltage: 11/22/33kV or customized
(6) Rating capacity: 500kVA ~ 6300kVA
(7) Frequency: 50/60Hz
(8) Vector group: 3phase 3 wire single winding star/delta
(9) Tap change positions: 9/11/13/17/27/32
(10) Cooling method: ONAN
(11) PT: 10000/100V 50VA
(12) CT: XXX/1A, 2 meter method
(13) Third winding rating: 220V
(14) Regulator range: ±10%, -5%~+15%, 0~+30% or customized
Voltage Regulator Structure
VACUUM TYPE ON LOAD TAP CHANGER: Regulator Vacuum type On load tap changer is of selector switch structure, which combines the functions of diverter and selector.
✓ Maintenance-free up to 100,000 tap-change operations.
✓ Exchange of diverter switch insert after 1.2 million operations.
✓ Designed for earthquake-prone areas and alternative insulating fluids.
✓ Max current up to 600A; Max voltage up to 145kV.
OIL IMMERSED TYPE ON LOAD TAP CHANGER: Typical combined-structure tap changer applicable in oil-immersed transformers, comprising diverter switch and tap selector.
✓ Electrical life: 50,000 times; Mechanical life: 500,000 times.
✓ Max current up to 400A; Max voltage up to 35kV.
✓ Contact resistance not bigger than 500μΩ.
✓ More economical than Vacuum type tap changer.
Intelligent Controller
▶ High Accuracy: 27 taps regulation in rated range.
▶ Long Life: Unique tap changer designed to avoid arcing.
▶ Maintenance-free: High IP protection degree sealing design.
▶ Flexible: Easy mounting within lines and substations.
▶ SCADA Ready: RS232 adapter for distribution automation.
FK Function Features
1. Friendly user interface to modify settings and browse online data.
2. Easy setup for voltage, bandwidth, delay, and offset voltage.
3. Measurement of load voltage, current, apparent power, reactive power, and power factor.
4. Automatic forward and reverse voltage regulation for ring network power supply.
5. RS232/RS485 interfaces for remote control and telemetry.
6. Multiple communication protocols compatible with master stations without extra RTU devices.
2. Easy setup for voltage, bandwidth, delay, and offset voltage.
3. Measurement of load voltage, current, apparent power, reactive power, and power factor.
4. Automatic forward and reverse voltage regulation for ring network power supply.
5. RS232/RS485 interfaces for remote control and telemetry.
6. Multiple communication protocols compatible with master stations without extra RTU devices.
Project & Installation
Frequently Asked Questions
Q1: What is the main function of the TVR-line voltage regulator?
A1: It is an autotransformer equipped with an on-load tap changer that automatically monitors and adjusts distribution line voltage to ensure it stays within required limits.
Q2: How does the 27-tap regulation benefit the power system?
A2: The 27-tap system allows for extremely fine adjustments with a regulation accuracy of 0.75% per step, ensuring smooth and precise voltage control.
Q3: What are the differences between Vacuum and Oil Immersed tap changers?
A3: Vacuum type is maintenance-free for up to 100,000 operations and handles higher currents (600A), while Oil Immersed type is a more economical solution for applications up to 400A.
Q4: Can the regulator operate in harsh environmental conditions?
A4: Yes, it is designed to work in temperatures from -25°C to 65°C and altitudes up to 3000m, with customizable options for more extreme environments.
Q5: Does the system support remote monitoring and SCADA?
A5: Yes, the intelligent controller includes RS232 and RS485 interfaces and supports various communication protocols for integration into SCADA and distribution automation systems.
Q6: How does low voltage affect industrial motors?
A6: Low voltage reduces torque and increases slip, which significantly raises stator and rotor current, leading to potential overheating or motor burnout.