产品概述
LZZBJ6-10B 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。
该产品采用环氧树脂真空浇注工艺制造,可提供穿芯式或母线式初级绕组,次级绕组则采用漆包铜线绕制。它具有优异的绝缘性能、紧凑的结构和可靠的运行。
变压器主要用于电力系统的电流测量、电能计量、继电保护和信号采集。它广泛安装在室内 switchgear箱式变电站、配电站、开关站及其他中压配电设备。
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。 - 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 1,000/5 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定制。 - High short-time thermal and dynamic withstand capability:
变压器能够承受系统短路故障期间产生的规定短时热电流和动冲击电流,有助于确保设备安全可靠运行。 - 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外露带电部件,并提供IP20防护等级。它适用于安装在室内开关设备内,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,并兼容标准的10千伏开关设备尺寸,简化了内部柜体布局。 - Clearly identified secondary terminals:
副端子由透明盖板保护,并清晰标记,方便接线。端子盖板有助于防止接线错误和短路。 - Flexible installation:
金属安装底座设有固定孔,可用于牢固地安装螺栓。变压器可水平或垂直安装在室内开关柜内。
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,并需要最少的日常维护。 - Wide operating temperature range:
变压器可在-30°C至+70°C的环境温度下运行。环氧树脂可保持稳定的机械和绝缘性能,不易变脆或变形。 - Stable accuracy characteristics:
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,以支持可靠的继电器保护运行。
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 | 10–1,000 安培,可定制 |
| 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
LZZBJ6-10B电流互感器适用于10千伏交流电力系统室内使用,最高系统电压为12千伏。
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 | LZZBJ6-10B 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。
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