HG-ARC is a modular system consisting of a communication management unit, an arc protection device unit, an arc extension unit, and an arc unit; The arc light unit includes arc light, dedicated optical fiber, and photoelectric converter. The arc light is connected to the photoelectric converter inside the protection device through optical fiber (if the quantity is increased, it can be achieved through an arc light expander, and a dedicated optical cable is used to connect the arc light, arc light expander, and arc light).

Due to modular configuration, the system is suitable for various applications of arc light protection. It can be composed of a simple system with only one busbar arc light protection unit, or a complex system with multiple units that can be used for selective arc light protection.

This system communicates with the station monitoring system through the communication management unit. The busbar arc protection unit and the feeder arc protection unit can be equipped with 2 Ethernet ports, 1 485 port, and 1 CAN port. The communication protocol supports commonly used communication protocol standards such as IEC60870-5-101, 104, and IEC61850 issued by the Ministry, making it easy to access the station's integrated automation system.

The schematic diagram of the system composition is shown in the following figure:

2. HG-ARC arc protection device

2.1 Introduction to arc protection device

The arc protection device is the core component of the arc protection system, responsible for the collection, measurement, calculation, and logical judgment of input quantities, realizing various protection logics of the system, communicating with the station monitoring system, self checking, and auxiliary functions.

The device chassis adopts the/u201C front and rear plug-in/u201D structure, which means the LCD display panel is front mounted and the plug-in is rear mounted, making maintenance convenient.

Arc protection system

2.2 Working principle of arc protection device

Arc light protection is grouped based on current units, and the arc light can be set to be associated with any group of current signals. When the arc light unit transmits the light signal from the arc light sensor to the main control unit, and at the same time, the current starting element is activated, the arc light protection is activated; The device can choose the arc signal action single criterion as the action logic judgment.

2.3 Internal electrical diagram of arc protection device

2.4 Definition diagram of back panel terminals for arc protection device

2.5 Technical characteristics of the device

The HG-ARC arc light protection device is a high-tech power automation product developed based on microcomputer application technology with excellent performance. Its characteristics are as follows:

(1) The HG-ARC arc light protection device has multiple data acquisition and processing capabilities;

(2) The overall design is digital, complete, and modular, which facilitates production debugging and on-site operation and maintenance;

(3) Complete circuit breaker control circuit;

(4) Friendly human-machine interface, navigation menu style operation, simple, convenient, and intuitive;

(5) Adopting dual criteria of overcurrent and arc light, with high reliability and compliance with electromagnetic compatibility standards;

(6) New fiber optic connection transmission, photoelectric conversion completed within the device, strong anti electromagnetic interference capability;

(7) A new type of ultraviolet arc light sensor and visible light sensor that filter interference light are used, which have the function of filtering interference light and avoiding the misoperation of visible light sensors caused by environmental light;

(8) The export trip time is less than 20ms, much faster than traditional busbar protection, and the total removal time for internal arc faults in the switchgear can be controlled within 100ms;

(9) Trip exit logic programmable;

(10) Each functional module improves the reliability of the system, and the device integrates multiple functions such as measurement, control, and communication, which can be controlled locally or remotely;

(11) Measuring multi-channel analog arc light sensor data can quantify the data of the arc light sensor, with an accuracy error of no more than 10 for light intensity. It can also be connected to multiple nonlinear arc light sensors. The arc light criterion is based on two key indicators: light intensity and spectral component ratio, which can reliably distinguish between interference light sources and arc light sources, achieving 100 accurate actions;

(12) Easy to connect, suitable for three-phase three wire or three-phase four wire systems of various high and low voltage systems.