Sourcing a furnace power supply is a qualification exercise, not a catalogue browse. Before you compare prices, decide what you can actually verify. When you shortlist a magnetic voltage regulator manufacturer, ask for the same documents you would demand from any magnetic voltage regulator supplier: the scope printed on the ISO 9001 certificate, routine and type test reports to IEC 60076, the core grade and conductor material, and the winding and oil-processing steps performed in-house. This guide walks a procurement or EPC buyer through the ten qualification tests, the capability facts worth putting in a quotation, and the eight fields your RFQ must contain.
Qualification targets: IEC 60076 & GB/T standards · ISO 9001 · ONAN oil-immersed cooling · Class F insulation · RoHS-compliant materials
An oil-immersed magnetic voltage regulator is a stepless AC power supply that changes output voltage by varying a low DC control current through a saturable magnetic circuit, instead of moving contacts or switching taps. In the three-phase build described on the product page, high-grade silicon steel cores and copper windings sit inside an oil tank; oil natural (ONAN) immersion carries heat away from the core and coils and keeps the insulation system stable during continuous duty. Because regulation is contactless, the voltage path has no wearing contacts, so an oil immersed magnetic regulator can hold a smooth output under full load.
Where the load is single phase, manufacturers also offer a single phase magnetic voltage regulator or magneto voltage regulator configuration, and a T-type connection for feeding a single-phase load from a three-phase grid. For furnace and metallurgical work, a magnetic voltage regulator for furnace supply is typically specified by capacity, input voltage, output voltage band and control mode rather than by a single voltage figure.
Work through these ten items in order. Each one names the document or demonstration that settles the question, so a quotation can be scored instead of judged on adjectives.
Each row states a published capability of the three phase oil immersed magnetic voltage regulator and the buyer check that follows from it. Use the third column as the question you put in your RFQ.
| Feature | Verified detail | Buyer check |
|---|---|---|
| Phase configurations | Three-phase build, with single phase oil immersed magnetic voltage regulator configurations also available. | Confirm whether your load is balanced three-phase or single-phase before fixing the phase count. |
| Capacity range | 30 kVA to 500 kVA, customizable, with 50, 100, 200 and 315 kVA models quoted as examples. | Size kVA against the furnace's rated demand, not its steady-state average. |
| Input voltage | 220 V / 380 V / 400 V / 415 V, three-phase, 50/60 Hz. | Match the site supply voltage and frequency before requesting a ratio. |
| Output voltage | Stepless adjustable under load; typical furnace range 5~650 V, with low-voltage models quoted at 5~35 V or 10~650 V. | Give the target voltage band and load resistance, not a single set point. |
| Regulation method | Contactless, stepless regulation: a low DC control current (small power) modulating high AC power. | Ask how the control current is derived and what the unit does on loss of control power. |
| Cooling method | Oil natural (ONAN) immersed cooling, providing cooling, insulation and reliability for heavy-duty industrial environments. | Check that the planned installation position allows the oil tank clearances your site can provide. |
| Efficiency | Efficiency rating above 96%, with energy loss, harmonics, noise and electromagnetic interference minimized. | Compare losses at your actual duty cycle, not only at rated load. |
| Short-circuit behaviour | Built-in overload protection limits short-circuit current to no more than 1.5 × rated load. | Verify upstream breaker settings against the limited fault current. |
| Insulation | Insulation rated Class F or higher. | Confirm the insulation class appears in the quotation and on the nameplate. |
| Core and windings | High-grade silicon steel cores and copper windings. | Ask for the core grade and conductor material in writing, not in a brochure. |
| Enclosure and hardware | Robust light-gray steel enclosure with reinforced structural ribs and corrosion-resistant stainless steel components. | Agree the site paint specification and the stainless hardware schedule. |
| Construction and serviceability | Modular design of the medium voltage control power transformer for easier installation and maintenance, with accessible service ports and long-lasting insulation. | Reserve access space around the service ports in your plant layout drawing. |
| Control modes | Switchable between manual open-loop and automated closed-loop PID control; supports automatic or programmable temperature control and PID temperature controllers. | Decide who supplies the temperature signal and how the set point is adjusted on site. |
| Connection arrangement | T-type connection for a three-phase grid with a single-phase load. | Confirm the single-phase load current and the tap arrangement before ordering. |
| Protection design | Integrated saturated reactor for short-circuit limiting, simplifying protective circuit demands; near-zero inrush current with close to zero-volt soft start. | Walk the start-up sequence through with your panel builder. |
| Working conditions | Altitude ≤ 1000 m; ambient ≤ +40 °C (typical range -10 °C ~ +40 °C); relative humidity ≤ 85%. | Derate capacity per oil-immersed transformer standards above 1000 m altitude. |
| Compliance | Meets IEC 60076 and GB/T standards; complies with IEC and ISO 9001; RoHS-compliant materials. | Request the certificate set and test reports together with the quotation. |
Reviewed against the published specification for the Three Phase Oil Immersed Magnetic Voltage Regulator – Stepless Magnetic Voltage Regulator for Furnace & Industrial Heating.
Match the duty first, then the specification. Each card pairs a published use case with the configuration to request and the decision that governs the order.
The regulator is described as an ideal supporting power supply for heating electric furnaces.
Low-voltage models are quoted with bands such as 5~35 V, alongside wider 10~650 V options.
The published application list covers vacuum, chemical, pharmaceutical, tungsten-molybdenum, tool machinery, metallurgy, glass and aluminium silicate industries.
Supports automatic temperature control or programmable temperature control and PID control compatibility.
A T-type connection allows a three-phase grid to supply a single-phase load.
An integrated saturated reactor supports short-circuit limiting and simplifies protective circuit demands, with near-zero inrush and close to zero-volt soft start.
Three supplier types sell into the same tender. The differences show up in what they can document, not in what they promise.
| Evaluation area | Oil-immersed regulator manufacturer | Trading reseller | General-purpose transformer OEM |
|---|---|---|---|
| Build scope | Core stacking and winding under the same quality system as the finished unit. | Assembled by a third party; process records are usually forwarded, not owned. | Strong transformer process, but magnetic regulation is not the core product line. |
| Custom ratios and ratings | Custom voltage ratios, power ratings and tap configurations offered within the published 30–500 kVA band. | Limited to the catalogue ratios the reseller is willing to warrant. | Custom work is possible but may be quoted against a standard transformer platform. |
| Test documentation | Routine and type test reports to IEC 60076, plus IEC and ISO 9001 compliance and RoHS declarations. | Often a generic datasheet plus a third-party test report of unclear origin. | Full transformer test set, but confirm the regulation-specific tests are included. |
| Regulation and protection design | Contactless stepless regulation, low DC control current modulating high AC power, integrated saturated reactor for short-circuit limiting, short-circuit limited to ≤ 1.5 × rated load. | Design details depend on the original builder and may not be released to you. | Protection design follows transformer practice; verify inrush and soft-start behaviour. |
| Spares and service | Accessible service ports, published insulation life approach and lower-maintenance operation. | Spares routed through the original factory, adding time and margin. | Spares available, with response times set by the service network. |
| Best fit | Furnace and industrial heating projects where fault behaviour and documentation matter. | Standard catalogue units bought on price and delivery only. | Projects needing a broad transformer scope alongside a regulator. |
Send these eight data points and every quotation you receive becomes comparable. Vague enquiries return vague prices.
Custom voltage ratios, power ratings and tap configurations are quoted against your furnace load, input supply and site conditions. Send the eight RFQ fields above with your enquiry and the quotation comes back complete with the matching test documentation.
Keep adjacent product options together for a faster catalog comparison.
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This heavy‑duty single phase magnetic voltage regulator, also named magneto voltage regulator / stepless magnetic voltage regulator, is oil‑immersed type specially designed as magn
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View productask for the scope wording on the iso 9001 certificate, the core grade and conductor material, the winding and oil-processing process, and the routine test report issued for your own serial number. a manufacturer can produce these records; a reseller usually forwards a generic datasheet. iec 60076 and iso 9001 compliance, along with rohs-compliant materials, are stated for this oil-immersed range.
the three phase oil immersed magnetic voltage regulator covers 30 kva to 500 kva and is customizable, with 50, 100, 200 and 315 kva models quoted as examples. three-phase input options are 220 v, 380 v, 400 v and 415 v at 50/60 hz. single phase oil immersed magnetic voltage regulator configurations are also available.
request the routine test report issued for your unit and the type test report for the model family, both to iec 60076. add the iso 9001 certificate with its scope line, rohs declarations, and the oil test record from the vacuum oil-processing step. the range is stated to meet iec 60076 and gb/t standards and to comply with iec and iso 9001.
yes. custom voltage ratios, power ratings and tap configurations are available, and the output stays stepless adjustable under load. typical furnace output bands run across 5~650 v, with low-voltage models quoted at 5~35 v. confirm the required band and the load resistance before the ratio is fixed, and ask for a sample nameplate from a comparable unit.
regulation is contactless and stepless: a low dc control current (small power) modulates high ac power, so the voltage path contains no moving contacts. control can be switched between manual open-loop and automated closed-loop pid modes, and the unit supports automatic or programmable temperature control as well as pid temperature controllers.
the unit is specified for altitude up to 1000 m, ambient up to +40 °c (typical range -10 °c to +40 °c) and relative humidity up to 85%, with capacity derated above 1000 m per oil-immersed transformer standards. insulation is class f or higher, built-in overload protection limits short-circuit current to no more than 1.5 × rated load, an integrated saturated reactor supports short-circuit limiting, and start-up inrush is near zero with close to zero-volt soft start.
