Mining Flameproof SVG Reactive Power Compensator

This mining flameproof SVG (static var generator) provides dynamic reactive-power compensation for underground coal-mine power systems. It responds in less than 10 ms, keeps the system voltage stable over long supply lines, raises the power factor, compensates harmonics and suppresses voltage fluctuation and flicker.

The compact, modular units have high power density and are easy to maintain; several units can be connected in parallel. It is used in many large and medium-sized coal mines in China.

Key Specifications

Applications

Reactive-power and harmonic compensation in underground coal-mine substations and long feeders.

Documents Supplied

For each order we can provide the technical data sheet, outline drawing, routine test report and, for explosion-proof equipment, a copy of the Ex certificate that matches the nameplate marking. Tell us in the inquiry which documents your project or your inspector requires, so they are prepared before shipment.

Related Products

• OLI-Wolong MVE Vibration Motors, Standard & ATEX
• MVC Medium-Voltage Variable Frequency Drive, 200-15000 kVA
• High-Power Water-Cooled Frequency Converter, 5-40 MVA

Explosion Protection Explained

The marking Ex d [ib] I combines a flameproof enclosure ("d") for the power section with intrinsically safe ("ib") control and signal circuits. Group I equipment is designed for underground coal mines where methane (firedamp) and coal dust may be present.

Models

WJ = flameproof SVG for low voltage; WJL / WJL2 = chain-type (cascaded) units for 3.3 - 10 kV.

How It Works

The SVG is a voltage-source IGBT inverter connected to the mine supply through a reactor. By setting the amplitude and phase of its output voltage it generates exactly the reactive current the network needs, smoothly and steplessly, and can swing from full capacitive to full inductive output in a few milliseconds. It also works as an active filter (APF) and cancels the 5th, 7th, 11th and 13th harmonics of converters, shearers and other non-linear loads.

• Power factor above 0.95; line current down by 30 % or more, so cables and mobile substations carry more load
• Supports the voltage at the far end of long underground feeders, typically 5 % or more
• Damps voltage fluctuation and flicker from impact loads
• Central, group or local (terminal) compensation; units can run in parallel or in several levels with the surface compensation

Technical Data

Protection covers over- and under-voltage, overload, overcurrent and short circuit, phase loss, reactor over-temperature, cooling-water conductivity, flow, temperature and pressure, fan and communication faults, DC over-voltage, IGBT failure, cell over-temperature and broken fibre. The last 100 faults are stored and can be exported.

Common Questions

What power range does the this unit cover?

The this unit covers 300 kvar / 500 kvar.

Which voltages are available for the this unit?

Rated voltage: 660 V, 1140 V, 3.3 kV, 6 kV, 10 kV. Other voltages can be checked on request.

Which explosion protection does the this unit have?

The marking is Ex d [ib] I. Tell us the zone, gas group and temperature class of your site and we confirm the right version.

How is the this unit cooled?

Cooling method: heat-pipe air cooling, or water cooling with separated inner and outer circuits.

How to Order

For a fast, accurate quotation please send: rated power (kW), voltage and frequency, motor rating and load type, supply voltage, hazardous-area requirements, quantity and destination port. For a replacement, a photo of the old motor nameplate is the quickest way to match it. Lead time (about 80 days), documents and shipping are explained on our Export Service page.