产品概述
LZZBJ9-10A 电流互感器 这是一款全封闭式穿墙式电流互感器，专为 10 kV 交流电力系统设计，最高系统电压为 12 kV。
该变压器采用环氧树脂真空浇注工艺制造，一次绕组可提供母线式或穿墙式，二次绕组则采用漆包铜线绕制。它具有优异的绝缘性能、结构紧凑、短时热电流和动稳定电流承受能力强、精度特性稳定等优点。
该产品主要用于电力系统中的电流测量、电能计量、继电保护和信号采集。它广泛安装于户内中压 switchgear箱式变电站、配电站及其他配电设备。
产品特点
绝缘与电气性能
- Epoxy resin cast insulation:
采用优质环氧树脂真空浇注成型。实心绝缘体内部无气隙，具有优良的介电性能。可满足12kV系统运行电压、工频耐压和雷电冲击耐压的要求。 - 长效绝缘寿命
一体式干式结构不含绝缘油，因此不存在漏油风险。在正常运行条件下，它还提供可靠的抗开裂和绝缘老化性能。 - Wide range of current ratios:
提供多种一次/二次电流比，包括 10/5 A、20/5 A、30/5 A，以及高达 2,000/5 A 的比率。可根据不同的计量和保护要求选择电流比。 - Multiple accuracy classes:
计量和保护准确度等级，如0.2S、0.5、5P和10P，可根据项目需求进行配置。 - High short-time thermal and dynamic withstand capability:
The transformer can withstand the specified short-time thermal current and dynamic current generated during system short-circuit faults. It is suitable for high-current and high-short-circuit-capacity applications. - Low partial discharge:
The advanced casting process limits partial discharge to no more than 10 pC, helping reduce insulation ageing and improve long-term operating reliability.
结构和安装特点
- Fully enclosed post-type structure:
一体式压铸结构不含裸露的带电部件，并提供IP20防护等级。它适用于室内开关设备安装，并有助于减少灰尘和湿气的侵入。 - Compact modular design:
紧凑的结构占用最小的安装空间，并与包括KYN28系列设备在内的标准10 kV开关设备兼容。它支持柜内方便的多回路布置。 - Clearly identified secondary terminals:
次级绕组端子由透明盖板保护，并清晰标记，方便接线。该盖板有助于防止接线错误、短路以及次级电路意外断开。 - Flexible installation:
金属安装底座设有固定孔，可牢固地安装螺栓。变压器可水平或垂直安装在室内开关柜内，并提供可靠的抗振动性能。
操作与维护特性
- Low-maintenance operation:
环氧树脂浇注体具有高机械强度、抗冲击性和耐老化性。其无油结构消除了泄漏风险，并有助于减少日常维护需求。 - Wide operating temperature range:
变压器可在-30°C至+70°C的环境温度下运行。环氧树脂在不发生脆化或变形的情况下，保持稳定的机械和绝缘性能。 - 稳定的低误差特性
计量绕组提供低且稳定的测量误差，可满足0.2S级高精度电能计量要求。 - Reliable protection performance:
保护绕组提供合适的准确限值系数，以支持可靠的继电保护运行并降低误跳或拒跳的风险。
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 |
| Rated Primary Current | 10–2,000 A, customizable |
| Rated Secondary Current | 5 A or 1 A |
| Metering Accuracy Class | 0.2秒 / 0.2 / 0.5 |
| Protection Accuracy Class | 5P10 / 10P10 / 5P20 / 10P20 |
| 工频耐压 | 42千伏，持续1分钟，相间及相对地，无击穿 |
| 雷电冲击耐受电压 | 75 kV peak, without breakdown |
| 局部放电 | ≤10 pC |
| Short-Time Thermal Current (Ith) | 20 times the rated current for 1 second, customizable |
| Dynamic Current (Idyn) | 2.5 times Ith, customizable |
结构和材料参数
| 参数 | 规格 |
|---|---|
| 绝缘介质 | 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 1208 | Current Transformers |
| GB/T 20840.1 | Instrument Transformers—Part 1: General Requirements |
应用
适用电压等级
LZZBJ9-10A电流互感器适用于10千伏交流电力系统，最高系统电压为12千伏的室内环境。
Typical Applications
- 室内中压开关柜的电流测量、电能计量及继电保护，包括KYN28和XGN系列设备
- 箱式变电站的当前信号采集
- Distribution stations and switching stations
- 10 kV distribution systems in industrial and mining enterprises
- Commercial buildings and industrial parks
- Current monitoring and control in power automation systems
- 主进线柜和高压出线柜
- 需要高短时热稳定性和动态电流承受能力的配电应用
主要功能
电流互感器将高一次侧电流按规定比例转换为标准的5A或1A二次侧电流。
It supplies current signals to:
- Energy meters
- Measuring instruments
- Relay protection devices
- Monitoring equipment
- Control systems
The transformer also provides electrical isolation between the primary and secondary systems, 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: -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 current ratios
- Special accuracy classes
- Non-standard mounting dimensions
安装与维护
安装要求
- Pre-installation inspection:
检查电流互感器，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，所供附件是否齐全。核实型号、规格、电流比和精度等级是否符合系统设计要求。 - Mounting:
将电流互感器安装在开关柜内指定位置，并用螺栓穿过底座上的安装孔将其固定。确保互感器安装牢固，无松动或移位。安装表面应保持水平，以防止机械应力不均。 - Primary-side connection:
根据电气设计连接主汇流排。确保汇流排与主端子紧密接触，并牢固拧紧所有螺栓，以防止因电气接触不良而导致过热。 - Secondary-side connection:
按照标记连接二次绕组端子。计量绕组和保护绕组必须分开正确接线。一次侧带电时，二次侧回路绝不允许开路。二次侧回路的一点必须可靠接地，以防止危险的过电压。 - Insulation inspection:
After installation, measure the insulation resistance between:- Primary and earth
- Secondary and earth
- Primary and secondary
维护要求
- Regularly inspect the epoxy resin body for cracks, mechanical damage, discharge marks, and contamination.
- 检查接线端子是否有松动、氧化和异常发热。
- 定期检查主母线和二次接线，确保所有连接牢固。
- 检查过热、变色、意外开路和错误短路。
- 定期测试绝缘电阻和电流比误差，以确认计量和保护精度保持在规定范围内。
- Clean dust and contamination from the transformer surface.
- Prevent oil and corrosive substances from contacting the epoxy resin body.
- 保持设备清洁干燥。
- 如果检测到开裂、放电、过热或测量误差过大，请立即断电并检查设备。必要时更换电流互感器。
注意事项
- 二次绕组在初级电路通电时绝不能开路。开路的二次电路可能会产生数千伏的危险过电压，对设备和人员造成严重风险。
- 在进行维护工作前，必须将副绕组牢固短路并接地。
- 运输和安装过程中，避免撞击或碰撞环氧树脂本体。机械损伤可能导致环氧树脂开裂，降低绝缘性能。
- The equipment must be reliably grounded. The grounding terminal on the metal base must be securely connected to the switchgear grounding busbar.
- 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 | LZZBJ9-10A 电流互感器 | 电流变换和电气隔离的主设备 |
| 2 | 安装螺栓和垫圈 | 用于在安装过程中固定电流互感器 |
| 3 | 透明副端子盖 | Protects the secondary terminals and helps prevent incorrect connection or short circuits |
| 4 | Product Instruction Manual | Provides installation, operating, and maintenance guidance |
| 5 | Product Certificate and Factory Test Report | Provides evidence of product quality and performance |
Applicable Standards and Certification
The product complies with the following standards:
- GB 1208, Current Transformers
- GB/T 20840.1, Instrument Transformers—Part 1: General Requirements
- GB/T 20840.2, Instrument Transformers—Part 2: Additional Requirements for Current Transformers
该产品已通过适用的型式试验，其性能满足室内10千伏电力系统的运行要求。
