电流互感器使用指南书 秀修

电流互感器使用指南书秀修
## Current Transformer User Guide (English)。

### Introduction.
Current transformers (CTs) are essential components of electrical power systems, providing a safe and accurate way to measure high currents. This guide provides a comprehensive overview of CTs, their types, construction, installation, and applications.
### Types of Current Transformers.
Window-type CTs: These CTs have a window or opening through which the conductor passes. They are typically used for measuring currents up to 1000 A.
Bushing-type CTs: These CTs are mounted on bushings in high-voltage equipment. They are used to measure currents up to 5000 A.
Closed-core CTs: These CTs have a closed magnetic circuit, providing excellent accuracy and stability. They are used in metering and protection applications.
Open-core CTs: These CTs have an open magnetic circuit that can be clamped around the conductor. They are used for temporary measurements and troubleshooting.
### Construction of Current Transformers.
CTs consist of a primary winding, a secondary winding, and a core. The primary winding is connected in series with the circuit being measured, while the secondary winding is connected to the measuring device. The core is made of ferromagnetic material, such as laminated iron or ferrite.
### Installation of Current Transformers.
Window-type CTs: The conductor is passed through the window of the CT. The CT should be installed in a location where it is protected from vibration and harsh environments.
Bushing-type CTs: The CT is mounted on the bushing and connected to the primary conductor. The bushing must be properly rated for the voltage and current being measured.
Closed-core CTs: The CT is installed on a busbar or cable, and the primary winding is connected to the busbar
or cable. The CT should be installed in a location with sufficient space for cooling.
Open-core CTs: The CT is clamped around the conductor
at the desired measurement point. The CT should be secured firmly and the jaws closed completely.
### Applications of Current Transformers.
CTs are used in a wide range of applications, including:
Metering: Measuring electrical current for billing purposes.
Protection: Detecting overcurrent conditions and
tripping circuit breakers.
Power factor correction: Monitoring power factor and adjusting capacitors to improve power factor.
Power quality analysis: Measuring harmonics, flicker, and other power quality parameters.
### Safety Considerations.
When working with CTs, it is crucial to follow proper safety precautions:
Always wear appropriate personal protective equipment (PPE).
Ensure that the CT is properly grounded.
Never open the CT's secondary circuit while it is connected to the primary circuit.
Use caution when working with high-voltage CTs.
## 电流互感器使用指南（中文）。

### 概述。

电流互感器 (CT) 是电力系统中的重要组成部分，可提供一种安全准确地测量高电流的方法。

本指南全面介绍了 CT、其类型、结构、安装和应用。

### 电流互感器类型。

窗口式 CT，这些 CT 有一个窗口或开口，导线从中穿过。

它们通常用于测量高达 1000 A 的电流。

套管式 CT，这些 CT 安装在高压设备中的套管上。

它们用于测量高达 5000 A 的电流。

闭合磁芯 CT，这些 CT 具有闭合磁路，可提供极高的准确性和稳定性。

它们用于计量和保护应用。

开磁芯 CT，这些 CT 具有开磁路，可以夹在导线周围。

它们用于临时测量和故障排除。

### 电流互感器的结构。

CT 由初级绕组、次级绕组和铁芯组成。

初级绕组与被测电路串联，而次级绕组与测量设备相连。

铁芯由铁磁材料制成，例如叠片铁或铁氧体。

### 电流互感器的安装。

窗口式 CT，导线穿过 CT 的窗口。

CT 应安装在远离振动和恶劣环境的位置。

套管式 CT，CT 安装在套管上并连接到初级导线。

套管必须针对被测电压和电流适当额定。

闭合磁芯 CT，将 CT 安装在母线上或电缆上，并将初级绕组连接到母线或电缆。

CT 应安装在有足够冷却空间的位置。

开磁芯 CT，在所需的测量点将 CT 夹在导线周围。

CT 应牢固固定，夹口完全闭合。

### 电流互感器的应用。

CT 用于广泛的应用，包括：
计量，测量电电流以进行计费。

保护，检测过流情况并跳闸断路器。

功率因数校正，监测功率因数并调整电容器以提高功率因数。

电能质量分析，测量谐波、闪烁和其他电能质量参数。

### 安全注意事项。

在使用 CT 时，必须遵循适当的安全预防措施：
始终佩戴合适的个人防护装备 (PPE)。

确保 CT 正确接地。

切勿在 CT 的次级电路连接到初级电路时打开该电路。

使用高压 CT 时要小心。