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Low Voltage Dynamic Reactive Power Compensation Cabinet - China Suppliers & Factory for Optimizing Power Quality
General
The low voltage dynamic reactive power compensation cabinet adopts a contactless switch, which is controlled by a dynamic reactive power compensation controller, tracks the rapid changes in reactive current, and switches multiple sets of capacitors quickly and frequently to maintain the optimal power factor, thereby minimizing line losses and increasing the effective output capacity of distribution transformers, optimizing power quality.
This cabinet has a very significant effect on stabilizing system voltage, improving power factor, and enhancing transformer carrying capacity. It is particularly suitable for fast tracking compensation of frequent and impulsive composite.
Service Conditions
- Altitude: ≤ 2000m
- Ambient temperature: -40℃～+45℃
- Relative humidity: ≤ 90%
- The surrounding environment is free of corrosive gases, conductive dust, and flammable and explosive media
- The installation site should have no severe vibrations or bumps, and the installation inclination should not exceed 5 degrees
※Note: If there are special environmental conditions, please consult with our company when placing an order.
Standards
| IEC 439 | Low voltage switchgear and control gear equipment |
| IEC144 | AC High Voltage Contactor |
| GB3906 | Metal enclosed switchgear |
| GB-11022 | General Technical Conditions for High Voltage Switchgear |
| GB311.1-311.6 | Insulation Coordination for High Voltage Transmission and Transformation Equipment |
| GB763 | Heating of AC High Voltage Electrical Appliances during Long Term Operation |
| GB2706 | Dynamic Stability of High Voltage Electrical Appliances |
| GB7252 | Low Voltage Switchgear |
Structural Characteristics
- The main components inside the compensation cabinet include air switches (or knife switches), capacitors, reactors, fuses (or small circuit breakers), contactless switches, and dynamic controllers; Compact structure and innovative layout.
- There are controllers, ammeters, voltmeters, signal lights, etc. on the panel for users to observe in real time.
- The cabinet is made of high-quality cold-rolled steel plate (or stainless steel) with good flatness, and the outer surface is treated with spray coating, which has strong anti-corrosion ability; The internal framework is made of galvanized steel plate to ensure good corrosion resistance.
- Complete protection functions: including short circuit, overload, over-voltage, under-voltage, and phase loss protection; Convenient setting of various parameters; When there is an external fault, it will automatically shut down and resume operation after power transmission.
- Reactive rate options: 6%, 7%, 12%, 14%.
Technical Parameter
Electrical Specifications
- Rated voltage: 380V, 660V
- Rated frequency: 50Hz/60Hz
- Rated compensation capacity: 30-800kvar
- Operating voltage range: 0.8-1.1Un
Performance & Control
- Compensation methods: co compensation, split compensation, mixed compensation
- Measurement error: Voltage: ± 0.5% | Current: ± 1.0% | Reactive power: ± 1.0%
- Maximum allowable overcurrent: 1.30 times constant current
- Control circuits: 1-16 circuits
Product Features
- Fast switching speed: Dynamic response time ≤ 20ms. After the capacitors in the same group exit, the device can be restarted without delay (completed within one cycle).
- Significant compensation effect: The controller adopts closed-loop control, which compensates in one go according to the system voltage and reactive power.
- Full protection function: with protection against over-voltage, under-voltage, short circuit, phase loss, temperature exceeding limit, etc.
- Automatic operation: The device can automatically exit operation in case of external faults and power outages, and automatically resume operation after power transmission.
Ordering Notice
- Determine the rated capacity of the transformer, the rated voltage on the secondary side, and the transformation ratio of the secondary side current transformer.
- Determine the reactive load condition and natural power factors, as well as the total operating current and fluctuation range of the compensated system and equipment.
- Whether the load characteristics are impact loads, fluctuating loads, or conventional steady-state loads.
- Device model, type, and total capacity.
- When the device is an outdoor type, indicate the material used: ordinary steel/stainless steel; And the color of the body.
If there are special requirements, should be specified in detail.
Frequently Asked Questions
What is the primary function of a low voltage dynamic reactive power compensation cabinet?
It tracks rapid changes in reactive current and switches multiple sets of capacitors dynamically using contactless switches to maintain an optimal power factor. This minimizes line losses and increases the transformer's effective output capacity.
How fast does the dynamic compensation system respond to load changes?
The device features an exceptionally fast dynamic response time of ≤ 20ms, allowing capacitors to exit and restart within a single cycle without delay.
What safety and protection mechanisms are integrated into the cabinet?
It features comprehensive built-in protection functions including short circuit, overload, over-voltage, under-voltage, phase loss, and over-temperature limits. It automatically shuts down during external faults and resumes when power stabilizes.
Can this equipment operate reliably in extreme environmental conditions?
Yes. The standard operating limits support ambient temperatures from -40℃ to +45℃ and altitudes up to 2000m. For unique environmental circumstances, custom configurations can be requested during ordering.
What options are available for cabinet enclosure materials?
Cabinets are constructed from high-quality cold-rolled steel plate or stainless steel with a protective spray coating. The internal framework uses galvanized steel plate to ensure strong anti-corrosion resistance.
What information is required to place an order?
You should provide the transformer's rated capacity, secondary side voltage/current ratios, load characteristics (impact, fluctuating, or steady-state), device model, total capacity, and whether it is for indoor or outdoor installation.