产品概述
JDZJ-3、JDZJ-6 和 JDZJ-10 (W) 型电压互感器 单相半封闭干式电压互感器适用于3千伏、6千伏和10千伏交流电力系统，最大系统电压为12千伏，可在室内和室外使用。
The high-voltage winding is insulated with cast epoxy resin, the magnetic core is made of high-quality laminated silicon steel sheets, and the windings are wound with enamelled copper wire. The product provides excellent insulation performance, reliable operation, and stable accuracy characteristics.
它主要用于室内中压设备的电压测量、电能计量、继电保护和绝缘监测。 switchgear户外配电设备、箱式变电站及其他配电系统。
产品特点
绝缘与电气性能
- Epoxy resin cast insulation:
The high-voltage winding is formed through an epoxy resin vacuum-casting process. The cast insulation contains no internal air gaps and provides excellent dielectric performance. It can withstand the operating voltage, power-frequency withstand voltage, and lightning impulse withstand voltage requirements of the corresponding system. - Oil-free construction:
The dry-type design contains no insulating oil, eliminating the risks of oil leakage, oil contamination, and fire associated with oil-filled equipment. - Multiple voltage ratings:
Models are available for 3 kV, 6 kV, and 10 kV systems. Voltage ratios such as 10/0.1 kV and 6/0.1 kV can be customized according to system requirements. - Multiple accuracy classes:
Metering accuracy classes of 0.2, 0.5, and 1 and protection accuracy classes of 3P and 6P are available for metering, protection, and insulation-monitoring applications. - High pollution-flashover resistance:
The high-voltage terminals feature a shed-type insulation structure that provides reliable resistance to surface flashover. The outdoor W-type model is designed for operation in polluted outdoor environments. - Low partial discharge:
The advanced casting process provides a low partial discharge level, helping reduce insulation ageing and improve long-term operating reliability.
结构和安装特点
- Semi-enclosed dry-type structure:
The high-voltage winding is enclosed in epoxy resin, while the exposed portion of the magnetic core uses air insulation. The oil-free design presents no oil leakage or fire hazard and provides a compact overall structure. - Modular design:
Standardized mounting dimensions make the transformer suitable for indoor switchgear and outdoor power distribution equipment. The outdoor W-type version incorporates rainproof and pollution-resistant features for exposed outdoor installation. - Clearly identified terminals:
The high-voltage terminals are clearly marked, while the low-voltage terminals are protected by a terminal cover. This arrangement simplifies wiring and helps prevent incorrect connections and accidental secondary-circuit short circuits. - Flexible installation:
The metal base includes mounting holes for secure bolt installation. The transformer can be installed horizontally inside indoor switchgear or mounted in outdoor distribution equipment. It provides reliable resistance to vibration and wind loads.
操作与维护特性
- Low-maintenance operation:
The dry-type, oil-free construction eliminates leakage and oil-related fire risks. The epoxy resin body provides high mechanical strength, impact resistance, and ageing resistance, reducing routine maintenance requirements. - Wide operating temperature range:
The transformer can operate at ambient temperatures from -30°C to +70°C. The epoxy resin maintains stable insulation and mechanical properties without becoming brittle or deformed. The outdoor model can withstand significant day-to-night temperature variations. - High-reliability design:
The windings are made of enamelled copper wire, and the magnetic core is constructed from high-quality laminated silicon steel sheets. The product provides low operating losses, limited temperature rise, and stable measurement accuracy. - Overvoltage withstand capability:
The transformer can withstand switching and lightning overvoltages within its specified insulation level, ensuring stable metering and protection signals.
技术规格
电气参数
| 参数 | 规格 |
|---|---|
| 适用系统电压 | 3 kV / 6 kV / 10 kV AC, Um = 12 kV |
| 额定频率 | 50 赫兹 |
| Rated Primary Voltage | 3 kV / 6 kV / 10 kV, customizable |
| Rated Secondary Voltage | 100 V for metering and protection; 100/3 V for optional insulation monitoring |
| Metering Accuracy Class | 0.2 / 0.5 / 1 等级 |
| Protection Accuracy Class | 3P / 6P |
| 工频耐压 | 3 kV system: 18 kV; 6 kV system: 24 kV; 10 kV system: 42 kV for 1 minute, without breakdown |
| 雷电冲击耐受电压 | 3 kV system: 40 kV; 6 kV system: 60 kV; 10 kV system: 75 kV peak, without breakdown |
| 局部放电 | ≤10 pC |
| 绝缘电阻 | ≥1,000 MΩ between high voltage, low voltage, and earth |
结构和材料参数
| 参数 | 规格 |
|---|---|
| 绝缘介质 | Cast epoxy resin and air insulation |
| 防护等级 | IP20 for indoor models; IP34 for outdoor W-type models |
| Installation Type | Indoor or outdoor post-type bolt mounting |
| 热等级 | Class B, 130°C |
环境参数
| 参数 | 规格 |
|---|---|
| Installation Altitude | ≤2,000 m; high-altitude versions available |
| 工作温度 | -30°C 至 +70°C |
| Storage Temperature | -40°C 至 +85°C |
| 相对湿度 | ≤95%, non-condensing |
适用标准
| Standard | 描述 |
|---|---|
| GB 1207 | Voltage Transformers |
| GB/T 20840.1 | Instrument Transformers—Part 1: General Requirements |
| GB/T 20840.3 | Instrument Transformers—Part 3: Additional Requirements for Inductive Voltage Transformers |
应用
Applicable Voltage Levels
Suitable for indoor and outdoor 3 kV, 6 kV, and 10 kV AC power systems with a maximum system voltage of 12 kV.
Typical Applications
- Voltage measurement, energy metering, and relay protection in indoor medium-voltage switchgear and box-type substations
- Voltage monitoring and insulation supervision in outdoor power distribution equipment and pole-mounted distribution systems
- 3 kV, 6 kV, and 10 kV distribution systems in industrial and mining enterprises
- Commercial buildings and industrial parks
- Voltage monitoring, control, and protection signal acquisition in power automation systems
- Indoor and outdoor distribution applications requiring oil-free insulation and enhanced resistance to pollution flashover
- Exposed outdoor applications using the W-type model
主要功能
The voltage transformer converts the system high voltage into a standardized secondary voltage, typically 100 V, at a specified ratio.
It supplies voltage signals to:
- Energy meters
- Measuring instruments
- Relay protection devices
- Monitoring equipment
- Control systems
- Insulation monitoring devices
The transformer also provides electrical isolation between the primary and secondary systems, helping protect connected equipment and operating personnel.
When equipped with an auxiliary secondary winding, it can provide a voltage signal for insulation monitoring and system earth-fault detection.
操作条件
正常运行条件
- Installation altitude: no more than 2,000 m
- Ambient temperature: -30°C to +70°C
- Severe or sudden temperature changes should be avoided
- Relative humidity: no more than 95%, non-condensing
- The environment should be free from corrosive gases
- Flammable or explosive substances are not permitted
- Severe vibration and mechanical impact should be avoided
- Indoor models must be protected from rain and condensation
- Outdoor W-type models can withstand normal rain, wind, and polluted environmental conditions
- Indoor models should be protected from direct sunlight
- Outdoor models should be installed in a well-ventilated location without standing water
Special Operating Conditions
Customized products are required for:
- Installation altitudes above 2,000 m
- Ambient temperatures outside the range of -30°C to +70°C
- Severe pollution or salt-spray environments
- Chemically corrosive environments
- Applications involving strong vibration or mechanical impact
- Non-standard voltage ratios
- Special accuracy classes
- Non-standard mounting dimensions
安装与维护
安装要求
- Pre-installation inspection:
Inspect the voltage transformer and confirm that the cast body is free from cracks, bubbles, mechanical damage, and other visible defects. Check that all terminal markings are clear and that the supplied accessories are complete. Verify that the model, specifications, voltage ratio, and accuracy class match the system design requirements. For outdoor W-type models, confirm that the pollution-resistant structure and sealing components are intact. - Mounting:
Position the voltage transformer at the specified installation location and secure it with bolts through the mounting holes in the base. Ensure that the transformer is firmly installed without looseness or displacement. The mounting surface should be level to avoid uneven mechanical stress. Outdoor installations must include suitable drainage and waterproofing measures. - High-voltage-side connection:
Connect the high-voltage terminal according to the system design. Ensure that the connection is secure and provides reliable electrical contact. Maintain adequate electrical clearance between the high-voltage conductor, grounded components, and other live parts. Outdoor installations must use suitable waterproof insulated conductors. - Low-voltage-side connection:
Connect the secondary terminals according to their markings. Metering, protection, and insulation-monitoring circuits must be wired separately and correctly. The secondary circuit must not be short-circuited during operation. One point of the secondary circuit must be reliably grounded according to the system design and applicable electrical safety requirements. - Insulation inspection:
After installation, measure the insulation resistance between:- High voltage and low voltage
- High voltage and earth
- Low voltage and earth
维护要求
- Regularly inspect the epoxy resin body for cracks, mechanical damage, discharge marks, and contamination.
- Check the high-voltage terminals for looseness, oxidation, or abnormal heating.
- Inspect the insulating sheds for accumulated dust or pollution.
- For outdoor W-type models, pay particular attention to the pollution-resistant structure, terminal sealing, and waterproof condition.
- Regularly check the high-voltage and low-voltage wiring to ensure that all connections remain secure and free from overheating or discoloration.
- Confirm that the secondary-circuit grounding remains reliable.
- Periodically test the insulation resistance and voltage ratio to verify that metering and protection accuracy remain within the specified limits.
- Check the insulation-monitoring function where an auxiliary winding is provided.
- Clean dust and contamination from the transformer surface.
- For outdoor models, regularly clean the insulating sheds to reduce the risk of pollution flashover.
- Prevent oil and corrosive substances from contacting the epoxy resin body.
- If cracking, discharge, overheating, or excessive voltage-ratio error is detected, immediately de-energize and inspect the equipment. Replace the transformer where necessary.
注意事项
- The secondary winding must not be short-circuited while the transformer is energized. A secondary short circuit may produce excessive current and create a serious risk to equipment and personnel. During maintenance, the transformer must be de-energized, and the secondary circuit must be safely isolated and grounded in accordance with applicable procedures.
- Avoid impact or collision with the epoxy resin body, high-voltage terminals, and insulating sheds during transportation and installation. Mechanical damage may reduce insulation performance and pollution-flashover resistance.
- Use suitable insulated conductors for high-voltage connections. Maintain adequate electrical clearance from grounded components and other live parts to prevent phase-to-phase or phase-to-earth discharge. Outdoor connections must be properly sealed against water ingress.
- The equipment must be reliably grounded. The grounding terminal on the metal base must be securely connected to the switchgear enclosure or grounding busbar.
- Store the product in a dry, ventilated, and shaded environment. Avoid direct sunlight, high temperatures, moisture, compression, and mechanical impact. Outdoor W-type models must also be protected from moisture and corrosion during storage.
- Installation, commissioning, and maintenance must be carried out by qualified electrical personnel in accordance with applicable electrical safety procedures.
标准供应清单
| 不。 | 物品 | 功能 |
|---|---|---|
| 1 | JDZJ-3, JDZJ-6, or JDZJ-10 (W) Voltage Transformer | Main device for voltage transformation, electrical isolation, and signal acquisition |
| 2 | 安装螺栓和垫圈 | Used to secure the voltage transformer during installation |
| 3 | 低压接线端子盖 | Protects the secondary terminals and helps prevent incorrect connection or short circuits |
| 4 | Product Instruction Manual | Provides installation, operating, maintenance, and wiring guidance |
| 5 | Product Certificate and Factory Test Report | Provides product quality and performance documentation, including voltage-ratio and accuracy test data |
Applicable Standards and Certification
The product complies with the following standards:
- GB 1207, Voltage Transformers
- GB/T 20840.1, Instrument Transformers—Part 1: General Requirements
- GB/T 20840.3, Instrument Transformers—Part 3: Additional Requirements for Inductive Voltage Transformers
The product has passed the applicable type tests, and its performance meets the operating requirements of 3 kV, 6 kV, and 10 kV indoor and outdoor power systems.
