Product Overview
Functional Definition
The JDZW-10R / JDZ12 series voltage transformers are precision electromagnetic instruments designed for accurate voltage measurement, energy قياس, and relay حماية applications in medium-voltage AC power systems. These transformers utilize electromagnetic induction principles to provide galvanically isolated secondary voltage signals proportional to primary voltage. The series features integrated fuse حماية matched to transformer short-circuit capacity, fully-enclosed vacuum cast راتنج الإيبوكسي البناء, and dual secondary voltage outputs (100V for قياس, 220V for circuit breaker operation).
Key Ratings
| Item | Specification (حسب الطلب / لوحة البيانات) |
|---|---|
| System voltage class | 10 kV / 6 kV / 3 kV class (للداخل/للخارج distribution applications) |
| Rated frequency | 50 Hz or 60 Hz |
| Rated voltage ratio | 10000/100/220 V (JDZ12-10R), 6000/100/220 V (JDZ12-6R), 3000/100/220 V (JDZ12-3R) |
| Accuracy classes | Metering: 0.2, 0.5, 1 / حماية: 6P |
| Rated output | 15 VA to 60 VA (فئة الدقة dependent) |
| Maximum output | 500 VA |
| Burden power factor | cosφ = 0.8 (lagging) |
| Voltage factor | 1.2 Un continuous operation capability |
| Insulation level | JDZ12-10R: 12/42/75 kV; JDZ12-6R: 7.2/32/60 kV; JDZ12-3R: 3.6/25/40 kV |
| Thermal class | Class E (75K temperature rise limit) |
| Fuse protection | Integrated internal fuse matched to transformer capacity |
| Applicable standards | IEC 61869-1 / IEC 61869-3; GB/T 20840.1 / 20840.3; GB 1207-2006 |
| Model variants | JDZ12-10R / JDZ12-6R / JDZ12-3R |
Product Shows
Working Principle
Operating on Faraday’s law of electromagnetic induction, the محول الجهد features a laminated magnetic core with primary winding connected to system voltage and secondary اللفات providing standardized output voltages. The magnetic flux generated by primary voltage induces proportional voltage in secondary اللفات, delivering dual-output configuration (100V for instrumentation, 220V for auxiliary circuits) through connected حمل impedance.
System التطبيق Position
- Medium Voltage Distribution: 3-10kV pad-mounted transformers, ring main units, and switchgear
- Energy قياس: Revenue-grade electricity measurement systems
- Protection Circuits: Overvoltage, undervoltage, and distance حماية schemes
- Circuit Breaker Control: 220V auxiliary supply for breaker operation mechanisms
- SCADA Integration: Supervisory control and voltage monitoring systems
Structural Overview
Vacuum cast راتنج الإيبوكسي البناء with fully-enclosed design ensures superior insulation performance, moisture resistance, and mechanical strength. Integrated internal fuse eliminates external fuse requirements, simplifying installation. Primary terminals accommodate 200A elbow-type cable connectors with sealed high-voltage interface. Secondary terminals feature sealed terminal covers with anti-tampering lead seals, suitable for للخارج enclosure applications with enhanced safety against electric shock and unauthorized access.
Model Designation
Model Code Explanation
- J — محول الجهد (VT/PT)
- D — أحادي الطور configuration
- Z — Cast-resin (epoxy) insulated, fully enclosed structure
- 12 — Design series
- 10 / 6 / 3 — Voltage class (kV)
- R — Built-in fuse protection
Variant Differences
JDZ12-10R (10kV), JDZ12-6R (6kV), and JDZ12-3R (3kV) share identical البناء principles and electrical performance characteristics. Variants differ in rated voltage, insulation coordination, and physical dimensions matched to respective voltage classes. All variants maintain dual-output configuration (100V/220V) and integrated fuse حماية.
Service Conditions
The JDZ12 series voltage transformers are designed for للداخل and للخارج operation (with appropriate enclosure) under normal ظروف الخدمة in medium-voltage power systems.
- Installation environment: للداخل or للخارج (with sealed enclosure)
- Altitude: Not exceeding 2000 m above sea level (higher altitude requires engineering confirmation with detailed parameters)
- Ambient temperature: −5 °C to +40 °C (daily average not exceeding 35 °C)
- Relative humidity: Daily average ≤ 95%, monthly average ≤ 90% (at +20 °C reference)
- Environmental conditions: Free from corrosive gases or vapors; free from explosive or flammable media; mechanically robust for complex environments and moderate mechanical stress
Construction
Construction Design
- Structure: Support (post) type for للداخل/للخارج switchgear and pad-mounted transformer applications
- Insulation: Fully enclosed vacuum cast راتنج الإيبوكسي insulation
- Core: Laminated magnetic core design with high permeability silicon steel
- Fuse integration: Internal fuse حماية matched to transformer thermal and mechanical limits
- Primary terminals: Sealed elbow-type cable connector interface (200A rating)
- Secondary terminals: Sealed terminal box with anti-tampering lead seal provisions
The vacuum cast راتنج الإيبوكسي provides stable insulation properties, excellent moisture resistance, contamination immunity, and long-term aging resistance for harsh للخارج and enclosed للداخل environments.
Windings & Terminal Marking
- Primary terminals: A / X (high-voltage side)
- Secondary terminals (100V output): a / x
- Secondary terminals (220V output): ad / xd
Terminal markings follow المعيار VT polarity conventions. Under normal operating conditions, when primary terminal A is positive with respect to X, secondary terminal ‘a’ is positive with respect to ‘x’. Correct terminal identification shall be observed to ensure قياس and حماية accuracy.
Technical Data
This section provides selection-oriented البيانات الفنية for the JDZ12 series للداخل/للخارج, vacuum cast محول الجهد used in 3-10 kV class AC systems (50 Hz or 60 Hz). Data shown below is intended for preliminary selection of فئة الدقة, المخرج المقنن capacity, and insulation coordination.
Definitions: Accuracy class indicates قياس precision (0.2, 0.5, 1) or حماية performance (6P). Rated output (VA) is specified per فئة الدقة. Maximum output is the thermal overload capacity. Voltage factor defines continuous overvoltage capability (1.2 Un).
Notation: مستوى العزل expressed as Um / AC withstand / Lightning impulse (BIL) per IEC 61869-1 and applicable project المعايير.
Data Reference
| Model | Rated Voltage Ratio (V) |
Accuracy Class 0.2 Output (VA) |
Accuracy Class 0.5 Output (VA) |
Accuracy Class 1 Output (VA) |
Accuracy Class 6P Outpu t(VA) |
Max Output(VA) |
Insulation Level (kV) |
|---|---|---|---|---|---|---|---|
| JDZ12-10R | 10000 / 100 / 220 | 15 | 30 | 60 | 50 | 500 | 12 / 42 / 75 |
| JDZ12-6R | 6000 / 100 / 220 | 15 | 30 | 60 | 50 | 500 | 7.2 / 32 / 60 |
| JDZ12-3R | 3000 / 100 / 220 | 15 | 30 | 60 | 50 | 500 | 3.6 / 25 / 40 |
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 Voltage Transformers | VT-specific requirements |
| GB/T 20840.1 | Instrument Transformers – Part 1: General Requirements | National المعيار (aligned with IEC 61869 framework) |
| GB/T 20840.3 | Instrument Transformers – Part 3: Voltage Transformers | National VT requirements (aligned with IEC 61869-3) |
| GB 1207-2006 | Voltage Transformers | National VT المعيار for domestic projects |
| IEEE C57.13 | Standard Requirements for Instrument Transformers | Optional (North America project reference) |
| IEC 60068-2-17 | Environmental Testing – Salt Mist | Optional (project-specific environmental validation) |
| IEC 60085 | Electrical Insulation – Thermal Evaluation | Insulation thermal class reference (Class E, 75K rise) |
Factory Test Compliance
- Routine tests per applicable IEC/GB requirements (including polarity/marking verification, ratio verification, accuracy verification per specified class and حمل, and dielectric withstand)
- Dielectric tests per insulation coordination requirements and applicable المعيار (AC withstand and lightning impulse)
- Visual and dimensional inspection including marking accuracy and workmanship conformity
- Fuse coordination test حيث تم تحديده by project requirement
- Type and special tests as required by project المواصفات (temperature rise, short-circuit, partial discharge)
Installation & Dimensions
- Outline dimensions and mounting details are provided in the dimensional drawings.
- The transformer shall be securely mounted using the designated fixing holes and bracket assembly.
- Primary connection shall utilize sealed elbow-type cable connector matched to 200A interface المواصفات.
- Secondary terminals require proper sealing after wiring completion; lead seal provisions shall be utilized per utility or site requirements.
- Adequate clearance shall be maintained for insulation, heat dissipation, and maintenance access per applicable electrical safety codes.
Outlines
JDZ12-10R / JDZ12-6R / JDZ12-3R Installation Dimensions
Connection Diagrams
JDZ12-10R نموذجي Connection Schematic
Safety Notes
- Primary circuit must be de-energized, isolated, and reliably grounded before any work on the transformer.
- Unlike current transformers, محول الجهد secondary circuits may be left open-circuit safely; however, proper حمل connection is required for accurate operation.
- Secondary terminal box seal shall be maintained to prevent unauthorized access and environmental ingress in للخارج applications.
- Fuse replacement (if accessible) shall only be performed by qualified personnel with proper voltage verification.
- All installation and maintenance work shall comply with local electrical safety regulations and utility practices.
Ordering Information
When placing an order, the required configuration shall be specified according to the local grid requirements, applicable المعايير, and project technical specification. The following parameters shall be clearly stated for technical confirmation and production release:
- Model designation and voltage class (JDZ12-10R / JDZ12-6R / JDZ12-3R)
- Rated voltage ratio (المعيار: 10000/100/220 V for 10kV class)
- Accuracy requirements (قياس: 0.2, 0.5, or 1 / حماية: 6P as applicable)
- Rated output capacity (VA) matched to connected burden
- Insulation level (المعيار values or project-specific requirements)
- Custom requirements (if applicable): special voltage ratios, output configurations, terminal arrangements, or environmental specifications
If local utility or project requirements apply (e.g., special voltage ratios, custom insulation levels, terminal arrangements, environmental ratings, documentation language, or required certificates), specify them at the ordering stage. Custom configurations shall be confirmed by technical agreement and final data sheet prior to production.
Customization & Engineering Support
The JDZ12 series supports flexible التخصيص including voltage ratio variations, فئة الدقة combinations, output configurations, and مستوى العزل adjustments to meet specific operating conditions and التطبيق environments. الدعم الهندسي available for:
- Burden calculation and secondary circuit design
- Accuracy class selection for قياس and حماية applications
- Insulation coordination for high-altitude or polluted environments
- Integration guidance for pad-mounted transformers and ring main unit applications
- Custom voltage ratios and dual-ratio configurations