产品概述
JLZZY1-10 三元组合式计量变压器 这是一种户外环氧树脂浇注式电能计量装置，专为10千伏三相四线交流电力系统设计，最高系统电压为12千伏。
Based on a three-element metering arrangement, the unit integrates three-phase voltage transformers and three-phase current transformers within a single assembly. It enables simultaneous acquisition of three-phase voltage and three-phase current signals for accurate energy metering, power calculation, and load monitoring.
The product is widely used for pole-mounted metering on outdoor 10 kV distribution lines and is one of the key energy-metering devices for three-phase four-wire power systems.
产品特点
绝缘与电气性能
- Outdoor epoxy resin cast insulation:
The complete unit is vacuum-cast using outdoor-grade epoxy resin. The solid insulation contains no internal air gaps and provides excellent dielectric performance. - Suitable for 12 kV systems:
The unit can withstand the operating voltage, power-frequency withstand voltage, and lightning impulse withstand voltage requirements of 10 kV power systems with a maximum system voltage of 12 kV. - Low partial discharge:
Partial discharge is limited to no more than 10 pC, helping reduce insulation ageing and improve long-term operational reliability. - Oil-free outdoor construction:
The product contains no insulating oil, eliminating the risks of oil leakage, oil contamination, and oil-related fire hazards. It is suitable for outdoor environments exposed to sunlight, rain, humidity, and normal atmospheric pollution. - Integrated three-element metering arrangement:
The unit is specifically designed for three-phase four-wire power systems. It integrates three voltage transformer elements and three current transformer elements for complete three-phase signal acquisition. - Simultaneous voltage and current acquisition:
Three-phase voltage and three-phase current signals can be acquired simultaneously for energy metering, power calculation, load monitoring, and electrical parameter analysis. - Wide ratio range:
A voltage ratio such as 10/0.1 kV can be supplied, while current ratios from 5/5 A to 2,000/5 A can be configured according to the connected load and metering requirements. - High metering accuracy:
Current transformer accuracy classes up to 0.2S and voltage transformer accuracy classes up to 0.2 are available. Accuracy classes of 0.5 and 1 can also be supplied according to project requirements. - High pollution-flashover resistance:
The high-voltage side features a multi-shed insulation structure with an extended creepage distance. This provides reliable resistance to surface flashover under polluted and humid outdoor conditions.
结构和安装特点
- Fully enclosed outdoor dry-type structure:
The complete assembly is formed as an integrated cast-resin body with no exposed internal live components. - IP65 protection rating:
The outdoor enclosure provides IP65 protection, helping prevent the ingress of rainwater, dust, and moisture. - Compact integrated design:
Integrating the voltage and current transformer functions into one unit reduces the number of separate devices, saves installation space, simplifies field wiring, and lowers equipment costs. - Alternative to conventional oil-immersed metering units:
The dry-type construction can replace traditional oil-immersed metering boxes in suitable applications while eliminating oil maintenance and leakage risks. - Outdoor high-voltage terminals:
The high-voltage side uses copper busbar-type terminals for convenient connection to outdoor distribution conductors. - Tin-plated terminal surfaces:
The terminal contact surfaces are tin-plated to improve resistance to oxidation and corrosion in humid outdoor environments. - Waterproof secondary terminal box:
The low-voltage terminals are installed inside an IP65 waterproof terminal box to protect the secondary circuits from rainwater and moisture. - Clear terminal identification:
The high-voltage terminals are clearly marked. Secondary voltage and current terminals are grouped separately to simplify wiring and reduce the risk of incorrect connections. - Flexible installation:
该单元支持室外电线杆安装横担和室内 switchgear 安装 - High mechanical stability:
The mounting structure provides reliable resistance to vibration and wind loads and can withstand normal outdoor wind, rain, snow, and mechanical impact when correctly installed.
操作与维护特性
- Low-maintenance operation:
The dry-type, oil-free design eliminates oil leakage, oil replacement, and oil-related fire hazards. - High mechanical strength:
The outdoor epoxy resin body provides reliable impact resistance, ageing resistance, and corrosion resistance. - Wide operating temperature range:
The unit can operate at ambient temperatures from -40°C to +70°C. The epoxy resin maintains stable insulation and mechanical properties without becoming brittle or deformed. - Suitable for extreme outdoor temperature variations:
The product can withstand significant day-to-night and seasonal temperature changes. - High operational reliability:
The voltage and current transformer elements use high-quality magnetic cores and winding materials, providing low operating losses and limited temperature rise. - Stable long-term accuracy:
The unit is designed to maintain stable metering performance with minimal accuracy drift during long-term operation. - Overvoltage withstand capability:
The product can withstand switching and lightning overvoltages within its specified insulation level.
技术规格
电气参数
| 参数 | 规格 |
|---|---|
| 适用系统电压 | 10 kV AC, Um = 12 kV |
| 额定频率 | 50 赫兹 |
| Voltage Ratio | 10/0.1 kV, customizable |
| Current Ratio | 5/5 A to 2,000/5 A, customizable |
| Voltage Transformer Accuracy Class | 0.2 / 0.5 / 1 等级 |
| Current Transformer Accuracy Class | 0.2S / 0.5S / 0.5 级 |
| 工频耐压 | 42 kV for 1 minute at the high-voltage terminal, without breakdown |
| 雷电冲击耐受电压 | 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 | Fully cast outdoor-grade epoxy resin |
| 防护等级 | IP65 |
| Installation Type | Outdoor pole-mounted crossarm installation or indoor switchgear installation |
| 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 | -40°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 1208 | Current Transformers |
| GB/T 17215 | Electricity Metering Equipment |
| DL/T 448 | Technical Administrative Code for Electric Energy Metering |
应用
Applicable Power System
The JLZZY1-10 Combined Metering Transformer is suitable for 10 kV three-phase four-wire AC power systems with a maximum system voltage of 12 kV.
Typical Applications
- Pole-mounted energy metering on outdoor 10 kV distribution lines
- Energy metering and load monitoring in indoor medium-voltage switchgear
- Box-type substations
- Switching and distribution stations
- 10 kV distribution systems in industrial and mining enterprises
- Commercial buildings and industrial parks
- Energy data acquisition in power automation systems
- Power monitoring, control, and load management systems
主要功能
The combined metering transformer converts the system high voltage and primary current into standardized secondary signals:
- Secondary voltage: 100 V
- Secondary current: 5 A
It supplies three-phase voltage and three-phase current signals to:
- Three-phase four-wire energy meters
- Metering instruments
- Load-monitoring equipment
- Power data acquisition devices
- Energy management systems
- Power automation equipment
The unit supports:
- Three-phase energy metering
- Active and reactive power calculation
- Load monitoring
- Electrical parameter acquisition
- Energy consumption analysis
- Power management
It also provides electrical isolation between the primary power system and the secondary metering circuits, helping protect connected equipment and operating personnel.
操作条件
正常运行条件
- Installation altitude: no more than 2,000 m
- Ambient temperature: -40°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
- The outdoor unit can withstand normal sunlight, rain, frost, wind, and atmospheric exposure
- Outdoor pole-mounted crossarm or indoor switchgear installation
- Severe corrosion, salt spray, and heavy sand or dust conditions should be avoided unless a customized version is used
Special Operating Conditions
Customized products are required for:
- Installation altitudes above 2,000 m
- Ambient temperatures outside the range of -40°C to +70°C
- Severe pollution or salt-spray environments
- Chemically corrosive environments
- Strong wind or severe sand and dust conditions
- High-intensity ultraviolet exposure
- Non-standard voltage ratios
- Non-standard current ratios
- Special mounting dimensions
安装与维护
安装要求
- Pre-installation inspection:
Inspect the combined metering transformer and confirm that the epoxy resin 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, current ratio, and metering accuracy classes match the system design requirements. - Mounting:
Select a suitable crossarm and mounting bracket according to the installation arrangement. Secure the metering transformer in the specified position and confirm that there is no looseness, displacement, or uneven mechanical loading. The mounting surface should be level. Outdoor pole-mounted installations must meet the applicable wind-load and anti-overturning requirements. - High-voltage-side connection:
Connect the high-voltage terminals according to the system design. Ensure that all connections are securely tightened and provide reliable electrical contact. Maintain adequate electrical clearance between high-voltage conductors, earthed components, and other live parts. Outdoor connections must be protected against water ingress and corrosion. Conductive joint compound should be applied to terminal contact surfaces where required to reduce oxidation. - Secondary-side connection:
Connect the voltage and current secondary terminals to the energy meter according to their markings. The current transformer secondary circuits must never be left open while the primary system is energized. The voltage transformer secondary circuits must never be short-circuited. The current secondary circuits must be reliably earthed at one point in accordance with the system design and applicable electrical safety requirements. Ensure that the waterproof secondary terminal box is correctly closed and sealed after wiring. - 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, corrosion, and abnormal heating.
- Inspect the waterproofing and corrosion protection of outdoor connections.
- Confirm that the secondary terminal box remains properly sealed.
- Regularly inspect high-voltage and low-voltage connections for looseness, overheating, and discoloration.
- Confirm that the current secondary circuits remain correctly connected and reliably earthed.
- Periodically verify the metering accuracy and compare the energy meter readings with the specified error limits of the combined metering transformer.
- Periodically test the insulation resistance and confirm that the insulation performance remains within the specified requirements.
- Clean dust and contamination from the product surface.
- 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, electrical discharge, overheating, or excessive metering error is detected, immediately de-energize and inspect the equipment. Replace the unit where necessary.
注意事项
- The current transformer secondary circuits must never be left open while the primary system is energized. The voltage transformer secondary circuits must never be short-circuited. Either condition may produce hazardous overvoltage or overcurrent and create a serious risk to equipment and personnel.
- During maintenance, the current secondary circuits must be securely short-circuited and earthed before disconnection. The voltage secondary circuits must be safely isolated before work begins.
- Avoid impact or collision with the epoxy resin body and high-voltage terminals 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 earthed components and other live parts to prevent phase-to-phase or phase-to-earth discharge.
- Confirm the correct phase sequence during three-phase wiring. Incorrect phase connections may affect metering accuracy.
- The equipment must be reliably earthed. The grounding terminal on the base must be securely connected to the grounding busbar.
- Outdoor installations must comply with the applicable lightning protection and earthing requirements.
- Store the product in a dry, ventilated, and shaded environment. Avoid direct sunlight, high temperatures, moisture, compression, and mechanical impact.
- Outdoor connections must be properly protected against rainwater ingress and corrosion.
- Installation, commissioning, and maintenance must be carried out by qualified electrical personnel in accordance with applicable electrical safety procedures.
- The metering transformer must pass verification by the relevant local metrology authority before being put into service where such verification is required.
标准供应清单
| 不。 | 物品 | 功能 |
|---|---|---|
| 1 | JLZZY1-10 Outdoor Three-Element Combined Metering Transformer | Main device for voltage and current transformation, electrical isolation, and three-phase energy metering |
| 2 | Mounting Brackets, Bolts, and Washers | Used to secure the metering transformer during installation |
| 3 | Secondary Terminal Box and Terminal Cover | Protect the low-voltage terminals against incorrect connection, short circuits, and water ingress |
| 4 | Product Instruction Manual | Provides installation, operation, maintenance, wiring, and outdoor mounting guidance |
| 5 | Product Certificate, Factory Test Report, and Metrological Verification Certificate | Provide product quality and performance documentation, including voltage-ratio, current-ratio, and accuracy test data |
Applicable Standards and Certification
The product complies with the following standards:
- GB 1207, Voltage Transformers
- GB 1208, Current Transformers
- GB/T 17215, Electricity Metering Equipment
- DL/T 448, Technical Administrative Code for Electric Energy Metering
The product has passed the applicable type tests and metrological verification. Its performance meets the energy-metering requirements of 10 kV three-phase four-wire power systems.
