Product Overview
JSZJK-3/6/10Q dry-type anti-ferroresonance three-phase five-limb voltage transformer is a semi-enclosed, epoxy cast-resin, indoor voltage transformer designed for medium-voltage power systems. It is used for voltage measurement, energy metering and relay protection in systems with rated frequency of 50Hz or 60Hz.
This series adopts a three-phase five-limb structure and is developed as an anti-ferroresonance voltage transformer, helping improve operating stability in switchgear and distribution systems. The transformer is available in 3.6kV, 7.2kV and 12kV voltage classes, corresponding to typical models such as JSZJK-3Q, JSZJK-6Q and JSZJK-10Q.
Structure Type
The product is a semi-enclosed epoxy cast dry-type structure. Its main insulation parts are cast in epoxy resin, giving the transformer good insulation performance, moisture resistance and mechanical strength, while maintaining a compact structure suitable for indoor installations.
Main Applications
- Indoor medium-voltage power systems
- Voltage measurement circuits
- Energy metering systems
- Relay protection circuits
- Distribution switchgear and power distribution cabinets
- Applications requiring anti-ferroresonance performance
Key Specifications
| Item | Specification |
|---|---|
| Model series | JSZJK-3Q, JSZJK-6Q, JSZJK-10Q |
| Product type | Dry-type anti-ferroresonance three-phase five-limb voltage transformer |
| Insulation structure | Semi-enclosed epoxy cast-resin |
| Installation | Indoor |
| Structure | Three-phase five-limb |
| Frequency | 50Hz / 60Hz |
| Voltage classes | 3.6kV, 7.2kV, 12kV |
| Main function | Voltage measurement, energy metering, relay protection |
| Standards | GB20840.3-2013, IEC61869-3:2011 and special project requirements |
| Ambient temperature | -25°C to +40°C |
Technical Features
- Dry-type design with no oil, suitable for indoor switchgear applications
- Anti-ferroresonance design improves operational stability
- Three-phase five-limb construction provides integrated phase arrangement
- Semi-enclosed epoxy cast insulation offers compact size and reliable insulation
- Supports one secondary winding or two secondary winding designs depending on model
- Suitable for metering, protection and auxiliary voltage applications
Technical Data
The following information is organized from the provided product sheet. Final parameters should be confirmed by approved drawings and nameplate data.
General Technical Conditions
| Item | Technical Condition |
|---|---|
| Frequency | 50Hz / 60Hz |
| Ambient temperature | -25°C to +40°C |
| Product category | Dry-type anti-ferroresonance VT |
| Construction | Semi-enclosed epoxy cast-resin |
| Phase arrangement | Three-phase five-limb |
| Applicable systems | 3.6kV, 7.2kV, 12kV indoor systems |
Electrical Technical Data Reference
| Type | Rated
Voltage Ratio |
Accuracy Class
& Rated Output |
Limit
Output |
Rated
Insulation Level |
|---|---|---|---|---|
| JSZJK-3Q | 3000/√3 / 100/√3 / 100 | 0.2/6P(3P)—20/100 0.5/6P(3P)—40/100 1/6P(3P)—80/100 |
600VA | 3.6/25/40kV |
| JSZJK-6Q | 6000/√3 / 100/√3 / 100 | 7.2/32/60kV | ||
| JSZJK-10Q | 10000/√3 / 100/√3 / 100 | 12/42/75kV | ||
| JSZJK-6Q | 6000/√3 / 100/√3 / 100/√3 / 100 | 0.2/0.2/6P(3P)—15/15/100 0.2/0.5/6P(3P)—15/20/100 0.5/0.5/6P(3P)—20/20/100 |
500VA | 7.2/32/60kV |
| JSZJK-10Q | 10000/√3 / 100/√3 / 100/√3 / 100 | 0.2/0.2/6P(3P)—15/15/100 0.2/0.5/6P(3P)—15/20/100 0.5/0.5/6P(3P)—20/20/100 |
500VA | 12/42/75kV |
| JSZJK-6Q | 6000/√3 / 100/√3 / 220/√3 / 100 | 0.2/3/6P(3P)—15/400/100 0.5/3/6P(3P)—20/400/100 |
500VA | 7.2/32/60kV |
| JSZJK-10Q | 10000/√3 / 100/√3 / 220/√3 / 100 | 0.2/3/6P(3P)—15/400/100 0.5/3/6P(3P)—20/400/100 |
500VA | 12/42/75kV |
Technical notes:
- One transformer corresponds to one selected accuracy class and rated output combination.
- For parameters beyond the listed scope, confirmation between manufacturer and purchaser is required.
- Models may be supplied with one secondary winding or two secondary windings according to application requirements.
- The exact wiring arrangement should follow the approved wiring diagram.
Construction and Design
| Component | Description |
|---|---|
| Main insulation | Epoxy cast-resin insulation |
| Structure form | Semi-enclosed dry-type design |
| Core arrangement | Three-phase five-limb magnetic structure |
| Function design | Anti-ferroresonance voltage transformer |
| Secondary design | Available with one or two secondary windings |
| Installation | Indoor switchgear / panel installation |
Application Guide
Suitable For
- Indoor medium-voltage switchgear
- 3.6kV, 7.2kV and 12kV systems
- Metering and monitoring circuits
- Relay protection circuits
- Applications requiring anti-ferroresonance performance
Not Recommended For
- Outdoor exposed installation without additional enclosure protection
- Oil-immersed transformer application environments
- Applications outside the specified voltage and insulation class
- Projects requiring a different primary/secondary ratio not technically confirmed
Outline Dimensions
According to the provided drawing, the product has a large integrated three-phase structure suitable for indoor installation. The final outline should be confirmed by the approved drawing before production.
| Item | Reference Value |
|---|---|
| Overall length | 688 mm |
| Mounting / body length reference | 643 mm |
| Top spacing reference | 208±3 / 150±3 / 150±3 mm |
| Overall width | 280 mm |
| Side width | 168 mm |
| Overall height | 295 mm |
| Body height reference | 170±3 mm |
| Approximate weight | 81.6 kg |
Wiring Information
The product sheet shows two typical wiring configurations:
- Configuration with one secondary winding
- Configuration with two secondary windings
Terminal designation and actual secondary function should be selected according to the metering and protection scheme of the project.
Engineering Notes
- Confirm whether one secondary winding or two secondary windings are required.
- Confirm the required rated voltage ratio before ordering.
- Do not exceed the rated output corresponding to the selected accuracy class.
- Check insulation level requirements according to the system voltage class.
- Confirm installation space because the product is an integrated three-phase structure.
Ordering Information
Please provide the following information when ordering or requesting a quotation:
- Model: JSZJK-3Q, JSZJK-6Q or JSZJK-10Q
- Required voltage ratio
- Required accuracy class and rated output
- Whether one secondary winding or two secondary windings are needed
- Rated insulation level requirement
- Installation drawing or switchgear dimensions
- Applicable standard or project specification
- Quantity and documentation requirement