Looking for current transformer manufacturers in Yueqing? This guide profiles ten local companies that publish current-transformer ranges and a Yueqing manufacturing or contact address. The selection covers low-voltage metering CTs, 10–35 kV indoor and outdoor units, gas-insulated-switchgear and ring-main designs, zero-sequence transformers and custom instrument current transformers.
A current transformer is not specified by voltage and ratio alone. The quotation must define whether the unit is for metering or protection, the accuracy class and rated burden, the number of cores, the short-time thermal and dynamic current, the installation drawing and the secondary-terminal arrangement. Use this guide to build a shortlist and then send every company the same technical schedule.
How this list was selected: Official company, product and contact pages were reviewed on 22 October 2026. The order is a research shortlist, not a quality, price, certification, export or “best” ranking. A published product range or address does not prove that BottomRace has audited every factory or that every model carries every approval. Confirm the legal entity, manufacturing site, exact model, current certificate and test scope before ordering.
Ten Yueqing current transformer manufacturers to compare
Start with the installation and the secondary equipment, then use the published product focus to choose the first group of suppliers. The list separates medium-voltage switchgear CTs from low-voltage instrument transformers and zero-sequence products.
| Manufacturer | Published location | Published CT focus | Useful first question |
|---|---|---|---|
| Zhejiang Beicheng Electric Co., Ltd. | Xinguang Industrial Zone, Liushi, Yueqing | 10/35 kV dry-type and oil-immersed CTs, combined metering units and low-voltage CTs | Indoor or outdoor, dry-type or oil-immersed? |
| Nahu Electrical Technology Co., Ltd. | No. 2188 Central Avenue, Liushi, Yueqing | 10–110 kV current, voltage and combined instrument transformers | Which voltage class, ratio and accuracy class? |
| Zhikai Electric Technology Co., Ltd. | Shahu Industrial Zone, Liushi, Yueqing | 0.5–35 kV CTs, open-type, zero-sequence and energy-harvesting transformers | Conventional CT or a split-core or zero-sequence design? |
| Zhejiang Luoke Electric Power Technology Co., Ltd. | Beibaixiang Industrial Zone, Yueqing | 10–35 kV gas-insulated-switchgear, ring-main and zero-sequence CTs | Which switchgear or ring-main interface? |
| Zhejiang Zhonghu Electric Co., Ltd. | Qiligang Industrial Park, Yueqing | 10–35 kV indoor CTs, voltage transformers and combined metering units | Which switchgear mounting and accuracy combination? |
| Youxing Electric Co., Ltd. | No. 281 Wei 20th Road, Yueqing Economic Development Zone | Instrument and metering CTs, multi-core and custom current transformers | Standard metering CT or a custom ratio and winding? |
| Zhejiang Huwang Electric Co., Ltd. | Bingang Park, Jingsan Road, Yueqing Economic Development Zone | 10–35 kV indoor, outdoor, gas-insulated-switchgear and zero-sequence CTs | Which 10–35 kV installation and core arrangement? |
| Jihu Electric Power Technology Co., Ltd. | Wei 19th Road, Yueqing Economic Development Zone | 10–35 kV gas-insulated-switchgear, indoor, outdoor and zero-sequence CTs | Which switchgear interface and secondary wiring? |
| Zhejiang Guoben Electric Power Technology Co., Ltd. | Chanxi Village, Liushi, Yueqing | 0.5–40.5 kV indoor and outdoor CTs, zero-sequence and low-voltage designs | Which low-, medium- or outdoor CT construction? |
| Yueqing Fuyi Switch Co., Ltd. | No. 151 Jingliu Road, Yueqing Economic Development Zone | 10–35 kV CTs, gas-insulated-switchgear CTs and switchgear insulation parts | CT only or a matched switchgear insulation assembly? |
Manufacturer profiles and questions to ask
1. Zhejiang Beicheng Electric Co., Ltd.
Short name: Beicheng Electric
Published location: Xinguang Industrial Zone, Liushi, Yueqing
Beicheng describes itself as a manufacturer that develops, designs, produces and sells instrument transformers. Its published catalogue separates 10 kV and 35 kV dry-type current transformers, oil-immersed current and voltage transformers, outdoor vacuum-switchgear current transformers, zero-sequence current transformers and low-voltage transformers. The same site also lists combined metering units. This makes the company relevant for buyers who need to compare several medium-voltage constructions, but the quotation should still identify the exact CT model and installation environment rather than referring only to a voltage class.
Before requesting a quote: State the system voltage, indoor or outdoor installation, primary current, ratio, secondary current, accuracy class, rated burden and protection-duty values. Identify the switchgear or metering application and the required core arrangement. For an oil-immersed or combined unit, include the insulation, tank, metering and connection requirements. Request the outline drawing, terminal marking, polarity, routine-test schedule and the type-test scope that names the offered model.
Official sources: 10 kV dry-type CT range · 35 kV dry-type CT range · contact page.
2. Nahu Electrical Technology Co., Ltd.
Short name: Nahu Electric
Published location: No. 2188 Central Avenue, Liushi, Yueqing
Nahu Electrical Technology states that it designs and manufactures current, voltage, combined and integrated instrument transformers from its base in Liushi. Its current-transformer category includes indoor LZZBJ9, LZZZBJ9 and LZX8 examples, three-phase integrated designs, bushing current transformers and low-voltage products. The company's overview says it covers 10 kV to 110 kV current and voltage transformers and combined metering units. For a high-voltage inquiry, the buyer should ask which factory makes the offered size and confirm the insulation type, creepage distance and test scope for the exact voltage class.
Before requesting a quote: Send the rated voltage, highest voltage for equipment, primary and secondary current, number of cores, accuracy class, rated output and short-time thermal current. Identify whether the CT is for metering, protection or both, and provide the installation drawing. For an outdoor or high-voltage design, state the insulation type, creepage distance, altitude and environmental conditions. Require the current transformer's polarity, terminal marking, routine tests and applicable type-test report.
Official sources: Current-transformer range · LZZBJ9-10 indoor CT · contact page.
3. Zhikai Electric Technology Co., Ltd.
Short name: Zhikai Electric
Published location: Shahu Industrial Zone, Liushi, Yueqing
Zhikai Electric publishes current transformers for 10 kV and 35 kV systems, together with low-voltage, split-core, opening-type, zero-sequence, residual-current, three-phase integrated and energy-harvesting designs. Its product range includes indoor and outdoor CTs, bushing types and gas-insulated-switchgear models. The company says its products are used in utilities, rail, industrial and building projects. This breadth is useful when the requirement is not a standard LZZBJ9, but a split-core or residual-current CT must still be specified by aperture, ratio, accuracy, burden and the relay or monitoring device it will feed.
Before requesting a quote: Describe the primary conductor or cable, available aperture, mounting method and whether the CT must open for retrofit. State the rated primary and secondary current, accuracy class, burden and the connected meter or protection relay. For a zero-sequence or residual-current product, give the minimum detectable current, aperture and output requirement. Ask for the wiring diagram, polarity, insulation test, burden test and the exact model drawing.
Official sources: Current-transformer category · LMZK split-core CT example · contact page.
4. Zhejiang Luoke Electric Power Technology Co., Ltd.
Short name: Luoke Electric
Published location: Beibaixiang Industrial Zone, Yueqing
Luoke Electric states that its predecessor was founded in 2010 and that it was renamed in 2018. It focuses on distribution-automation products, including 10–35 kV current and voltage transformers for gas-insulated switchgear and ring-main units. The published catalogue also includes zero-sequence current transformers, current transformers for pole-mounted switches and low-voltage instrument transformers. Buyers should separate a conventional indoor CT from a gas-tank or ring-main interface: the latter needs the switchgear outline, busbar or cable position, dielectric clearance and mounting details before a suitable design can be quoted.
Before requesting a quote: Identify the switchgear or ring-main model, the phase spacing, available CT window and the primary conductor arrangement. State the system voltage, ratio, accuracy class, burden, number of cores and secondary lead route. For a zero-sequence unit, provide the cable or bushing diameter and relay input. Ask for the assembly drawing, insulation coordination, partial-discharge test where applicable and the final factory test record.
Official sources: Gas-insulated/ring-main CT range · Zero-sequence CT range · contact page.
5. Zhejiang Zhonghu Electric Co., Ltd.
Short name: Zhonghu Electric
Published location: Qiligang Industrial Park, Yueqing
Zhonghu Electric publishes a current-transformer series that includes LZZBJ9-10AG, LZZBJ9-10A, LZZBJ9-10C, LZZBJ9-12/150b/2, LZZBJ9-12/150b/4, LZZBJ9-35/250W1G1 and LZZB9-24 examples. The broader catalogue also includes voltage transformers, combined instrument transformers and metering boxes. This is a useful starting point for buyers who need to match an indoor CT to a particular switchgear or metering arrangement. The model numbers do not by themselves define the final electrical data: ratio, cores, accuracy, burden and short-time ratings must appear in the supplier's quotation and drawing.
Before requesting a quote: Provide the switchgear type, phase spacing, busbar or cable connection and required mounting orientation. Specify the primary current, ratio, secondary current, core count, accuracy class, rated burden, short-time thermal current and dynamic current. If metering and protection share one housing, state the requirements of each core. Request the terminal diagram, polarity, nameplate data and routine-test schedule.
Official sources: Current-transformer range · LZZBJ9-10AG example · contact page.
6. Youxing Electric Co., Ltd.
Short name: Youxing Electric
Published location: No. 281 Wei 20th Road, Yueqing Economic Development Zone
Youxing Electric publishes current transformers for metering, protection and custom applications. Its English page describes high-voltage and medium-voltage CTs, multi-core designs, through-hole and toroidal constructions, and other instrument current transformers. The company lists a 5,600-square-metre plant and says it offers custom ratios, multiple taps, mounting options and burden ratings. The page also states that some products are made to GB 20840.2-2014 and IEC 60044-1. Buyers should verify which standard and which test scope apply to the exact model being purchased.
Before requesting a quote: State the primary and secondary current, ratio, accuracy class, burden, number of cores, taps, mounting and required insulation. Give the connected meter or relay details and the available space. For a custom core or winding, send the dimensional envelope and connection diagram. Ask for the rated continuous thermal current, short-time current, polarity, routine test record and model-specific compliance document.
Official sources: Current-transformer range · contact page.
7. Zhejiang Huwang Electric Co., Ltd.
Short name: Huwang Electric
Published location: Bingang Park, Jingsan Road, Yueqing Economic Development Zone
Huwang Electric publishes 10–35 kV current and voltage transformers, including indoor and outdoor current transformers and CTs for inflatable cabinets, ring-main units and zero-sequence applications. Its English catalogue identifies examples such as LJZN1-10(G), LJZN1-20(G), LJZN1-35(G), LSY3-10/110 and LSY3-10/130. The published contact address is Building 12, second floor, Bingang Park, Jingsan Road, Yueqing Economic Development Zone. A buyer should confirm whether the quoted product is an indoor cast-resin design, an outdoor unit or a gas-tank version, because the drawings and test requirements differ.
Before requesting a quote: Identify the installation, system voltage, phase spacing and primary conductor. Specify rated primary current, ratio, secondary current, number of cores, accuracy classes, burden and protection parameters. For a gas-insulated or ring-main application, send the equipment drawing and required terminal position. Ask for the insulation level, partial-discharge and power-frequency withstand requirements, polarity, secondary wiring and routine-test record.
Official sources: Indoor 10–35 kV CT range · Gas-insulated/ring-main CT range · contact page.
8. Jihu Electric Power Technology Co., Ltd.
Short name: Jihu Electric
Published location: Wei 19th Road, Yueqing Economic Development Zone
Jihu Electric focuses on 10–35 kV current and voltage transformers for gas-insulated switchgear, ring-main units, indoor and outdoor installations, and pole-mounted switchgear. Its product categories separate gas-insulated-switchgear current and zero-sequence transformers from indoor and outdoor CT ranges. The company publishes an address at Wei 19th Road in the Yueqing Economic Development Zone. The category structure is useful for narrowing the search, but the buyer should still supply the host equipment drawing, required primary current and the relay or meter input before asking for a final model.
Before requesting a quote: Send the host switchgear or ring-main model, CT position, available window and phase distance. State the rated voltage, primary and secondary current, ratio, accuracy class, burden, cores and short-time ratings. Provide the secondary terminal arrangement and the earthing or polarity requirement. Request the outline drawing, insulation and partial-discharge test requirements, nameplate and the production address for the exact unit.
Official sources: Indoor 10–35 kV CT range · Gas-insulated/ring-main CT range · contact page.
9. Zhejiang Guoben Electric Power Technology Co., Ltd.
Short name: Guoben Electric
Published location: Chanxi Village, Liushi, Yueqing
Guoben Electric describes itself as a developer and manufacturer of 0.5–40.5 kV indoor and outdoor current and voltage transformers. Its catalogue separates 3–10 kV and 15–35 kV indoor CTs, 3–35 kV outdoor CTs, gas-insulated-switchgear transformers, breaker transformers, low-voltage CTs and combined metering units. The published address is Chanxi Village, Liushi, Yueqing. The broad voltage span means that the buyer should make the application explicit: a low-voltage panel CT, a 10 kV switchgear CT and a 35 kV outdoor unit are not interchangeable even when they appear in the same online catalogue.
Before requesting a quote: State the application voltage, indoor or outdoor location, primary current, ratio, secondary current, accuracy class, burden, cores and mounting. For a low-voltage CT, give the busbar or cable size and window dimensions. For an outdoor unit, add the insulation, creepage, altitude and environmental requirements. Ask for the actual model drawing, polarity, routine tests and the type-test scope applicable to the quoted design.
Official sources: 3–10 kV indoor CT range · 3–35 kV outdoor CT range · contact page.
10. Yueqing Fuyi Switch Co., Ltd.
Short name: Fuyi Switch
Published location: No. 151 Jingliu Road, Yueqing Economic Development Zone
Yueqing Fuyi Switch publishes 10–35 kV current and voltage transformers together with contact boxes, bushings, sensors, insulators and other switchgear insulation components. Its gas-insulated-switchgear current-transformer category includes LMZK-10 and through-core designs. The contact page gives No. 151 Jingliu Road in the Yueqing Economic Development Zone. This makes the company relevant when a buyer needs a CT alongside related switchgear insulation parts. Keep the CT specification separate from the surrounding parts so that the electrical ratings, tests and responsibility for the assembly remain clear.
Before requesting a quote: Provide the switchgear model, CT mounting position, primary conductor and available aperture. State the system voltage, ratio, secondary current, accuracy class, burden, cores and short-time current. If insulators, contact boxes or bushings are included, send the assembly drawing and identify who is responsible for dielectric coordination and final testing. Request the CT routine test record, polarity, terminal markings and the model-specific type-test evidence.
Official sources: Gas-insulated-switchgear CT range · Through-core CT range · contact page.
Specify the CT as a metering or protection device
A current-transformer price is comparable only when both quotations describe the same electrical duty and physical interface. Build a technical schedule with the fields below, send it unchanged to the shortlisted manufacturers, and require each supplier to list deviations in writing.
| Include in your enquiry | Ask each supplier to confirm |
|---|---|
| Application and location | Metering or protection; indoor, outdoor, gas-insulated switchgear, ring-main unit, busbar, cable or low-voltage panel; the host equipment and installation drawing. |
| System and insulation | Rated system voltage, highest voltage for equipment, insulation level, frequency, phase spacing, creepage distance and environmental conditions. |
| Primary and secondary current | Rated primary current, ratio or ratios, 1 A or 5 A secondary, continuous thermal current, short-time thermal current and dynamic current. |
| Accuracy and burden | Accuracy class for each core, rated burden, power-factor basis, instrument-security factor for metering and accuracy-limit factor for protection. |
| Protection performance | Composite error, relay or breaker coordination, knee-point or excitation data where applicable, and the required short-circuit duty. |
| Cores, taps and polarity | Number and purpose of cores, multi-ratio taps, terminal identification, polarity marks, secondary earthing and wiring diagram. |
| Construction and dimensions | Window or busbar opening, overall dimensions, mounting holes, terminal boxes, cable access, weight and the relationship to the host equipment. |
| Insulation and materials | Cast-resin, oil, gas or other insulation; core material; winding material; enclosure finish; fire, UV and corrosion requirements. |
| Tests and standards | Applicable standard, routine tests, type tests, special tests, partial-discharge requirements, report language and the entity and factory covered by the documents. |
| Nameplate and documents | Nameplate data and language, serial number, drawing revision, test record, installation instructions and packing or transport protection. |
| Production and change control | Factory address, subcontracting, approved model revision, component or material substitution rules and written notification before a change. |
Do not compare CTs by model name alone. A LZZBJ9 or LJZN1 label can cover different ratios, cores, accuracy classes, burdens, insulation levels and terminal arrangements. Ask for guaranteed values and the test basis in the order. For protection CTs, confirm the short-time thermal and dynamic ratings against the switchgear fault level; for metering CTs, confirm the burden of the complete secondary loop.
When a CT is part of a switchgear package, define the battery limits. State who supplies the CT, mounting hardware, secondary wiring, terminal blocks, earthing, test links and final switchgear tests. A CT that is mechanically suitable but not tested with the host assembly may leave an unresolved interface risk.
What to inspect during a current-transformer factory visit
Follow the selected CT through its production route. A useful factory visit links the winding, insulation, assembly and test records to the model in the quotation.
- Incoming materials: review the core, conductor, insulation, resin or oil, terminal and nameplate identification, and how material batches are linked to production records.
- Core and winding: compare the core type, winding direction, ratio taps, interlayer insulation and handling controls with the approved drawing.
- Insulation process: for cast-resin CTs, review vacuum casting, curing and partial-discharge controls; for oil or gas designs, review the relevant drying, filling and sealing records.
- Assembly and interfaces: check polarity, terminal marking, secondary wiring, mounting dimensions, gaskets, earthing points and the window or busbar arrangement.
- Routine tests: review ratio, polarity, resistance, insulation resistance, power-frequency withstand, burden and accuracy tests, plus partial-discharge or other tests required for the selected design.
- Type-test evidence: verify that the report identifies the offered model, ratings, factory and standards rather than only the company name.
- Document control: check how the serial number links to the drawing, nameplate, test result and packing list, and how changes are notified before shipment.
BottomRace coordinates electrical sourcing and purchasing in Yueqing. Pro: $0 separate service fee; procurement service costs are included in the product quotation. Basic: 5% of product value, with a minimum service fee of $100, for your existing Yueqing suppliers. Compare our Pro and Basic services. For on-site meetings, see our factory visit services. The quotation confirms the scope, inspections, payment terms and any additional costs.
If the CT is part of a broader panel or switchgear package, see our Yueqing transformer manufacturer guide, distribution-box guide and terminal-block guide for related sourcing questions.
Questions current-transformer buyers often ask
What is the difference between a metering CT and a protection CT?
They are selected for different jobs. A metering CT is chosen for accurate measurement at normal load and has limits intended to protect the connected instrument. A protection CT must reproduce fault current and remain accurate over the required fault range. The accuracy class, burden, composite error and short-time ratings should be tied to the actual relay or meter and the system fault level.
Should I ask for 1 A or 5 A secondary current?
The choice depends on the connected equipment, wiring distance, burden and project practice. Specify the secondary current required by the relay, meter or terminal arrangement. Do not change from 5 A to 1 A without checking the connected device’s input and the complete secondary-loop design.
How do I choose the CT ratio?
Start with the expected normal current, maximum continuous load and fault current. The ratio must leave room for accurate metering while providing the protection device with a measurable fault signal. The final choice should be checked against the relay or meter settings, rated burden and the switchgear fault level.
What does the rated burden mean?
It is the secondary load at which the declared accuracy is maintained, usually expressed in VA at a specified power factor. Include the wiring, terminals, test links, meter or relay input and any connected instruments in the burden calculation. A CT that is accurate on a bench may fail the requirement after the secondary cable and devices are connected.
Why does the installation drawing matter?
The same nominal CT can be supplied with different windows, terminal positions, mounting holes and clearances. The drawing confirms that the unit fits the switchgear, busbar or cable, and that the secondary wiring can be routed and earthed correctly. Approve the drawing and nameplate data before production.
Can BottomRace help arrange a Yueqing CT factory visit?
Yes. Email your CT application, system voltage, ratio, accuracy class, burden, cores, host equipment and preferred dates to contact@bottomrace.com. We can agree the local coordination, interpretation and observation scope before arranging the visit. We do not replace your engineer’s protection or metering design review.
Build your current-transformer shortlist with local support
Email your CT specification, host equipment drawing, quantities and preferred visit dates. We can discuss suitable suppliers and factory visits in Yueqing.