Applications

Magnetic voltage regulators have been widely adopted in salt-bath electric furnaces, vacuum electric furnaces, electroslag vertical melting furnaces, monocrystal and polycrystal furnaces, cracking furnaces, vertical sintering (droplet-melting) furnaces, as well as electric melting furnaces in the glass industry and the aluminum-silicate refractory fiber industry. Wherever a hot process requires smooth, continuously adjustable AC power with automatic control, the magnetic voltage regulator is a proven and rugged solution.

Working Principle

The magnetic voltage regulator consists of two parts: a transformer and a saturable reactor. Its working process uses the controllable characteristic of saturation reactance to change the distribution ratio of the supply voltage between the transformer primary winding (WB1) and the reactor reactance winding (WG), thereby adjusting the secondary output voltage continuously from minimum to maximum — without any moving contacts or taps.

Because the saturable reactor provides a current-limiting action, the unit achieves a favorable drooping output characteristic, giving it a strong ability to withstand short circuits on the load side. The load voltage waveform shows some distortion, and the degree of distortion is related to the magnitude of the output power.

Selection Notes

• The specified regulation range refers to the rated load resistance. If the actual load resistance differs from the rated value, the effective regulation range will change — this is most obvious in the lower region of the regulation range.
• For this reason, a magnetic voltage regulator is generally not suitable for no-load voltage regulation. Please size the unit according to your actual load, or consult our engineers.
• Closed-loop control can be interfaced with your furnace temperature controller for fully automatic operation.

Technical Parameters (Typical Range)

Voltage class	0.38 – 35 kV
Rated capacity	5 – 3,500 kVA
Regulation mode	Stepless smooth regulation via saturable reactor excitation
Control	Open-loop manual or closed-loop automatic (interfaced with temperature controller)
Characteristic	Drooping output characteristic, strong anti-short-circuit capability
Typical applications	Salt-bath furnace, vacuum furnace, electroslag furnace, monocrystal/polycrystal furnace, cracking furnace, glass electric melting furnace, refractory fiber industry
Standards	ISO 9001:2015 quality system; CE certified

Note: the above is the standard supply range. Ratings outside the table can be designed to order — send us your load resistance, voltage range and control requirements.