Product Overview
Functional Definition
The JSJW-3, JSJW-6, and JSJW-10 series are ثلاثي الطور, مغمور بالزيت inductive voltage transformers designed for accurate voltage measurement, energy قياس, insulation monitoring (residual voltage), and relay حماية in للداخل medium-voltage AC power systems (50 Hz / 60 Hz). The transformer provides galvanically isolated secondary voltages proportional to the primary voltage, supplying standardized low-voltage signals to meters, حماية relays, and SCADA/monitoring devices.
Key Ratings
| Item | Specification (حسب الطلب / لوحة البيانات) |
|---|---|
| System voltage class | 3 kV / 6 kV / 10 kV class (للداخل distribution and switchgear applications) |
| Rated frequency | 50 Hz or 60 Hz |
| Transformer type | Three-phase مغمور بالزيت, five-limb core (typ.) with sealed tank construction |
| Typical نسبة الجهد المقنن (kV) | JSJW-3: 3/√3 / 0.1/√3 / 0.1/3; JSJW-6: 6/√3 / 0.1/√3 / 0.1/3; JSJW-10: 10/√3 / 0.1/√3 / 0.1/3 (other ratios متاح عند الطلب) |
| Typical secondary voltages | 0.1 kV (100 V) phase voltage (0.1/√3 kV) for قياس; 0.1/3 kV (33.3 V) as open-delta residual voltage winding input (3U0) where provided |
| Accuracy classes (typ.) | Metering: 0.2 / 0.5 / 1; حماية: 3P or 6P (كما هو محدد) |
| Rated burden | Per secondary winding كما هو محدد (VA) |
| Burden power factor | cosφ = 0.8 (lagging) unless otherwise specified |
| Pollution degree | Class II (typ.) for للداخل industrial environment |
| Seismic withstand | 0.4 g horizontal acceleration (typ.) |
| Applicable standards | IEC 61869-1 / IEC 61869-3; GB/T 20840.1 / GB/T 20840.3; GB 1207 (legacy where required); JB/T 5277 (حيث ينطبق) |
Product Shows
Working Principle
The JSJW series operates on Faraday’s law of electromagnetic induction. A laminated silicon steel five-limb magnetic core carries the primary and multiple secondary اللفات. When the primary winding is energized by system voltage, alternating magnetic flux is established in the core and induces proportional voltages in the secondary اللفات according to the turns ratio. The مغمور بالزيت insulation system provides dielectric strength and heat dissipation, while the sealed tank reduces moisture ingress and slows oil aging for long-term للداخل service.
System التطبيق Position
- Medium Voltage Distribution: 3–10 kV للداخل switchgear and distribution panels
- Energy قياس: قياس voltage supply for billing and monitoring circuits
- Protection Circuits: Voltage-based حماية (over/under-voltage) and directional schemes where applicable
- Insulation Monitoring: Open-delta residual voltage (3U0) for earth-fault / insulation supervision (when equipped)
- SCADA Integration: Voltage input for RTU/IED monitoring and recording
Structural Overview
Oil-immersed البناء with a sealed steel tank and porcelain bushings provides reliable insulation coordination and stable thermal performance. The internal active part consists of the core-and-coil assembly mounted inside the oil tank. Primary terminals are routed through bushings for ثلاثي الطور connection, while secondary terminals are arranged for قياس, حماية, and residual voltage functions per configuration. The floor-mounted base allows secure للداخل installation with adequate clearances and convenient maintenance access.
Model Designation
Model Code Explanation
- J — محول الجهد (VT/PT)
- S — ثلاثي الطور configuration
- J — مغمور بالزيت insulation
- W — للداخل installation (室内)
- 3 / 6 / 10 — Rated voltage class (kV)
Service Conditions
The JSJW series is designed for للداخل operation under normal ظروف الخدمة in medium-voltage power systems.
- Installation environment: للداخل installation only
- Altitude: ≤ 1000 m (higher altitude requires engineering confirmation and potential insulation derating)
- Ambient temperature: −5 °C to +40 °C
- Relative humidity: ≤ 85% at +20 °C reference; avoid condensation
- Seismic capability: 0.4 g horizontal acceleration (typ.)
- Environmental conditions: Free from corrosive gases/vapors; free from explosive or flammable media; no severe vibration, shock, or impact
Construction
Construction Design
- Structure: ثلاثي الطور مغمور بالزيت محول الجهد, floor-mounted
- Insulation: Mineral insulating oil in sealed tank; porcelain bushings for primary terminals
- Core: Cold-rolled silicon steel laminations, five-limb core (typ.)
- Tank: Sealed steel tank with grounding terminal and oil service provisions
- Mounting: Base plate with mounting holes for secure للداخل installation
The sealed oil tank البناء minimizes moisture ingress and slows insulation aging. Core-and-coil assembly is fully immersed in oil to improve dielectric strength and thermal stability under continuous operation.
Windings & Terminal Marking
- Primary terminals: A, B, C (ثلاثي الطور high-voltage)
- Secondary terminals (قياس winding): a, b, c, n (phase voltage output for قياس)
- Secondary terminals (حماية winding, if provided): ax, bx, cx, nx (كما هو محدد)
- Residual voltage (open-delta) terminals: da, dn (3U0 output, حيث تم توفيره)
- Grounding: Tank grounding terminal for protective earthing
Terminal markings follow المعيار VT polarity and phase conventions. Correct phasing and single-point grounding of the secondary circuit shall be implemented according to applicable المعايير and the project wiring diagram.
Technical Data
This section provides selection-oriented البيانات الفنية for JSJW-3 / JSJW-6 / JSJW-10 ثلاثي الطور مغمور بالزيت voltage transformers used in 3–10 kV class AC systems (50 Hz / 60 Hz). Data below supports preliminary selection of voltage ratio, secondary winding combination, فئة الدقة combination, المخرج المقنن, and مستوى العزل. Final data shall follow the nameplate and factory test report for the delivered unit.
Definitions: 0.1 kV corresponds to 100 V secondary voltage. Open-delta residual winding is expressed as 0.1/3 kV and is typically used for residual voltage (3U0) indication/حماية. Insulation level is expressed as Um/Ud/Up (maximum system voltage / power-frequency withstand / lightning impulse withstand), in kV.
Technical Parameters
| Type | Rated Voltage Ratio (kV) |
Accuracy Class Combination |
Rated Output (VA) |
Limit Output (VA) |
Rated insulation Level (kV) Um / Ud / Up |
|---|---|---|---|---|---|
| Configuration A: Two secondary اللفات + residual (open-delta) winding | |||||
| JSJW-3 | 3/√3 / 0.1/√3 / 0.1/3 | 0.2 / 6P (3P) | 30 / 100 | 800 | 3.6 / 25 / 40 |
| JSJW-6 | 6/√3 / 0.1/√3 / 0.1/3 | 0.5 / 6P (3P) | 60 / 100 | 7.2 / 32 / 60 | |
| JSJW-10 | 10/√3 / 0.1/√3 / 0.1/3 | 1 / 6P (3P) | 120 / 100 | 12 / 42 / 75 | |
| Configuration B: Three secondary اللفات + residual (open-delta) winding | |||||
| JSJW-3 | 3/√3 / 0.1/√3 / 0.1/√3 / 0.1/3 | 0.2 / 0.2 / 6P (3P) | 15 / 20 / 100 | 800 | 3.6 / 25 / 40 |
| JSJW-6 | 6/√3 / 0.1/√3 / 0.1/√3 / 0.1/3 | 0.2 / 0.5 / 6P (3P) | 15 / 25 / 100 | 7.2 / 32 / 60 | |
| JSJW-10 | 10/√3 / 0.1/√3 / 0.1/√3 / 0.1/3 | 0.5 / 0.5 / 6P (3P) | 30 / 30 / 100 | 12 / 42 / 75 | |
Connection Diagram
Standards & Normative References
| Standard | Title | Application |
|---|---|---|
| IEC 61869-1 | Instrument Transformers – Part 1: General Requirements | General requirements |
| IEC 61869-3 | Instrument Transformers – Part 3: Additional Requirements for Inductive Voltage Transformers | VT/PT specific requirements |
| GB/T 20840.1 | Instrument Transformers – Part 1: General Requirements | National المعيار aligned with IEC framework |
| GB/T 20840.3 | Instrument Transformers – Part 3: Voltage Transformers | National VT/PT technical requirements |
| GB 1207 | Inductive Voltage Transformers (legacy, where required) | Project/utility legacy reference |
| JB/T 5277 | Technical المواصفات for Voltage Transformers (حيث ينطبق) | Industry reference |
| GB 311.1 | Insulation Coordination for High-Voltage AC Systems | Insulation coordination reference |
Factory Test Compliance
- Routine tests including polarity/وضع العلامات على المحطات verification, ratio verification, and accuracy verification at specified حمل and power factor
- Dielectric tests including power-frequency withstand and insulation resistance measurement per insulation level
- Residual winding check for open-delta output (3U0) function (حيث تم توفيره)
- Visual and dimensional inspection including tank integrity, oil tightness, bushing condition, and nameplate conformity
- Type and special tests as required by project المواصفات (e.g., impulse withstand, temperature rise, seismic qualification)
Installation & Dimensions
- Mount the transformer on a stable, level للداخل foundation using the base mounting holes and appropriate anchor bolts.
- Maintain adequate electrical clearances and creepage distances per applicable المعايير and the project insulation coordination design.
- Connect primary terminals A/B/C according to the wiring scheme; route secondary circuits with clear identification to قياس/حماية panels.
- Ground the tank grounding terminal to the station grounding system; implement single-point grounding on the secondary circuit as required.
- Verify oil level (if equipped with indicator) and check for leakage before commissioning; ensure bushings are clean and intact.
Outline & Installation Dimensions
Ordering Information
When placing an order, specify the configuration according to the project electrical design, applicable المعايير, and technical المواصفات. The following parameters shall be stated for technical confirmation and production release:
- Model designation: JSJW-3 / JSJW-6 / JSJW-10
- Rated voltage ratio: primary and secondary ratios (including residual open-delta ratio where required)
- Secondary winding configuration: Configuration A or Configuration B (number of اللفات and functions)
- Accuracy class combination: قياس accuracy + حماية accuracy (e.g., 0.2/6P(3P))
- Rated output (VA): per secondary winding
- Insulation level: Um/Ud/Up per system insulation coordination (المعيار or enhanced)
- Documentation and tests: required certificates, language, special tests (if any)
Selection Guidance: Choose the الموديل by system voltage class (3/6/10 kV). Confirm whether residual voltage (3U0) is required; if yes, specify open-delta winding and its المخرج المقنن. Determine قياس and حماية accuracy requirements per utility/project المواصفات, then calculate the total حمل per winding (device VA + wiring loss) and select the المخرج المقنن with suitable margin. Verify مستوى العزل against the project insulation coordination design and installation environment.