产品概述
JDZX11-15/20 电压互感器 这是一种全封闭、环氧树脂浇注、干式电压互感器，带有一个残压绕组，专为室内 15 kV 和 20 kV 交流电力系统设计，最高系统电压为 24 kV。
该变压器采用一体化高爬电、耐污缘设计，具备电压测量、电能计量、继电保护和绝缘监测功能，适用于中压 switchgear箱式变电站、开关站及其他室内配电设备。
该产品广泛应用于工矿企业、商用建筑及工业园区内的15千伏和20千伏配电系统。特别适用于中性点非有效接地系统的绝缘监测。
产品特点
绝缘与电气性能
- 专为 15 kV 和 20 kV 系统设计：
该变压器专为中压系统设计，最高运行电压为 24 千伏。它能够承受 15 千伏和 20 千伏配电系统规定的工频和雷电冲击耐受电压试验。 - Fully enclosed epoxy resin cast insulation:
变压器采用环氧树脂真空浇注工艺整体成型。固体绝缘体内部不含气隙，具有优异的介电性能。 - 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 dry-type construction:
该产品不含绝缘油，消除了漏油、油污染和与油相关的火灾隐患。适用于现代室内无油配电系统。 - High pollution-flashover resistance:
多伞裙绝缘结构显著增加了爬电距离，提高了在潮湿或污染环境下的耐表面闪络能力。 - 多功能绕组配置
内置残压绕组提供100/3 V输出，用于接地故障检测和绝缘监测。适用于三相五柱式电压互感器连接方式。 - 多种电压比和精度等级
提供15/0.1/0.1/3千伏和20/0.1/0.1/3千伏等标准电压比。可提供高达0.2级的计量精度等级，而3P和6P等保护精度等级可定制。
结构和安装特点
- Fully enclosed dry-type structure:
绕组和带电部件完全封装在环氧树脂浇注体中。该产品提供 IP20 防护等级，不含绝缘油。 - Compact construction:
紧凑的结构占用有限的安装空间，并兼容标准的 15 kV 和 20 kV 开关设备安装尺寸。 - Clearly identified secondary terminals:
二次端子配有端子盖保护，并清晰标记，方便接线。根据开关设备二次接线设计，可单独连接计量、保护和残压回路。 - Secure bolt mounting:
The metal base is provided with mounting holes for horizontal bolt installation inside indoor switchgear. The structure provides reliable mechanical stability and vibration resistance.
操作与维护特性
- Low-maintenance operation:
干式无油设计消除了泄漏和油相关的火灾风险。环氧树脂浇注体提供高机械强度、抗冲击性和耐老化性，有助于减少日常维护需求。 - 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 under both high- and low-temperature conditions. - High-reliability construction:
磁芯由优质叠片硅钢片制成，而绕组则用漆包铜线绕制。 - Low operating losses:
优化的磁芯和绕组设计可实现低功率损耗、有限的温升和稳定的测量精度。 - Overvoltage withstand capability:
变压器可在其规定的绝缘水平内承受开关和雷电过电压，确保可靠的计量、保护和绝缘监测信号。
技术规格
电气参数
| 参数 | 规格 |
|---|---|
| 适用系统电压 | 15 千伏 / 20 千伏 交流电，最高工作电压 = 24 千伏 |
| 额定频率 | 50 赫兹 |
| Rated Primary Voltage | 15 千伏 / 20 千伏 |
| Rated Secondary Voltage | 100 V 用于计量和保护；100/3 V 用于残压和绝缘监测 |
| Metering Accuracy Class | 0.2 / 0.5 / 1 等级 |
| Protection Accuracy Class | 3P / 6P |
| 工频耐压 | 高压端50千伏，持续1分钟，无击穿 |
| 雷电冲击耐受电压 | 95千伏峰值，无击穿 |
| 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 epoxy resin |
| 防护等级 | IP20 |
| Installation Type | 室内柱式螺栓安装 |
| 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 Series | Instrument Transformers |
应用
适用电压等级
JDZX11-15/20 型电压互感器适用于 15kV 和 20kV 交流电力系统中，最高系统电压为 24kV 的户内环境。
Typical Applications
- 室内中压开关柜的电压测量、电能计量和继电保护
- Voltage monitoring in box-type substations
- 15千伏和20千伏变电站配电系统
- 工矿企业供电系统
- Commercial buildings and industrial parks
- 非有效接地中性点系统中的绝缘监测
- 三相五柱式电压互感器接线方式
- Indoor distribution environments requiring enhanced resistance to humidity and pollution flashover
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.
残压绕组为接地故障检测和绝缘监测提供信号，支持非有效接地中压系统安全运行。
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
- Significant dust and salt-spray contamination should be avoided
- Indoor post-type installation
- Direct sunlight, rain, and condensation should be avoided
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:
检查电压互感器，确认浇注体无裂纹、气泡、机械损伤及其他可见缺陷。检查所有端子标记是否清晰，附件是否齐全。核实型号、规格、电压比及准确度等级是否符合系统设计要求。确认残压绕组参数符合绝缘监测系统要求。 - Mounting:
Position the voltage transformer at the specified location inside the switchgear 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. - High-voltage-side connection:
按照系统设计连接高压端子。确保所有连接牢固，并提供可靠的电气接触。保持高压导体、接地部件和其他带电部件之间有足够的电气间隙，以防止放电。 - Low-voltage-side connection:
按照标记连接二次侧端子。计量、保护和残压回路必须分开正确接线。二次回路在运行期间不得短路。二次回路的一点必须根据系统设计和适用的电气安全要求可靠接地。 - 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.
- 检查绝缘棚是否有积尘或污染物。
- 定期检查高压和低压线路，确保所有连接牢固，没有过热或变色的迹象。
- Confirm that the secondary-circuit earthing remains reliable.
- Periodically test the insulation resistance and voltage ratio to verify that the metering and protection accuracy remain within the specified limits.
- 定期检查剩余电压回路和绝缘监测功能。
- Clean dust and contamination from the transformer surface and insulating sheds.
- Prevent oil and corrosive substances from contacting the epoxy resin body.
- 如果检测到开裂、电击、过热、电压比误差过大或功能失效，请立即断电并检查设备。必要时更换变压器。
注意事项
- 变压器带电运行时，二次绕组不得短路。二次短路可能产生过大电流，对设备和人员造成严重风险。维护期间，必须断开变压器电源，并按照适用规程安全地隔离和接地二次回路。
- 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.
- 使用合适的绝缘导体进行高压连接。与接地部件和其他带电部件保持足够的电气间隙，以防止相间或对地放电。
- 设备必须可靠接地。金属底座上的接地端子必须牢固连接到开关设备的接地母线上。
- Store the product in a dry, ventilated, and shaded environment. Avoid direct sunlight, high temperatures, moisture, compression, and mechanical impact.
- 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 | JDZX11-15/20 Voltage Transformer | 电压变换、电气隔离和绝缘监测的主要设备 |
| 2 | 安装螺栓和垫圈 | Used to secure the voltage transformer during installation |
| 3 | 次级端子盖 | Protects the low-voltage terminals and helps prevent incorrect connection or short circuits |
| 4 | Product Instruction Manual | 提供安装、操作、维护和绝缘监测电路接线指南 |
| 5 | Product Certificate and Factory Test Report | 提供产品质量和性能文件，包括电压比、精度和残压电路测试数据 |
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
该产品已通过适用的型式试验，其性能满足室内 15 千伏和 20 千伏电力系统的运行要求。
