overview
Why use ESBEL-QGW Intelligent Arc Light Protection System?
In power systems, short-circuit faults and arc flash can occur within switchgear for the following reasons:
Aging and mechanical wear of insulation
Environmental factors such as dust, temperature, humidity, corrosion, etc
Poorly made cable glands
Overvoltage
Equipment failure
Human error in operation or incorrect wiring
Other causes (animal rodent infestation, etc.)
Once the arc light is generated, its degree of harm depends on the arc current and the cutting time, and the energy generated by the arc rises exponentially with 12 t. Only the removal of faults in a very short time can save the equipment from damage. If the total removal time is greater than 100ms, the equipment will be burned locally, and the switchgear will explode and casualties at worst, and some may cause a chain accident of "fire company".
According to China's current relay protection design standards, special fast bus protection is generally not configured in medium and low voltage bus systems. However, due to the many outlets on the medium and low voltage busbar, frequent operation, the distance between the three-phase conductor lines and the distance from the earth is relatively close, it is easy to be harmed by small animals, the equipment manufacturing quality is worse than that of high-voltage equipment, the equipment insulation aging and mechanical wear, the operating conditions are harsh, the system operating conditions change, the operation error and other reasons, the failure probability of the medium and low voltage bus is much higher than that of the high voltage and ultra-high voltage busbars.
However, for a long time, people have not paid enough attention to the protection of medium and low voltage busbars, mostly relying on the backup overcurrent protection of the higher-level components (such as transformers) to remove the bus short circuit fault, resulting in a long fault removal time, often so that the fault is developed and expanded, resulting in huge economic losses. According to reports, hundreds of medium-voltage handcart cabinets in China's power system are burned every year. Most of the reasons are caused by the failure to quickly cut off the fault without special medium and low voltage bus protection. Therefore, in order to ensure the safe operation of transformers and bus switchgear, according to the requirements of fast relay protection, it is urgent to configure special medium and low voltage bus protection.
ESBEL-QGW intelligent arc light protection system perfectly solves this problem, the system according to the detected arc light signal, in a very short time (<7ms protection action exit) can cut off the bus (and feeder) fault, to ensure the safety of equipment and personnel, reduce losses.
Product Introduction
ESBEL-QGW intelligent arc protection system is a new generation of intelligent arc protection products developed by our company on the basis of long-term electrical automation product design and development, and the introduction of foreign advanced technology concepts.
This series of products includes ESBEL-QGW-800 arc protection main unit, ESBEL-QGW800I. arc acquisition unit, ESBEL-QGW-800II. rectifier cabinet acquisition unit and ESBEL-QGW-800III. feeder protection unit.
The main application areas of this product:
Low and medium voltage busbar protection in the switchgear
Feeder cable connector protection
Box-type substation protection
Rectifier cabinet protection
By detecting the characteristics of arc flash generated when a fault occurs inside the switchgear, combined with the principle of overcurrent lockout, the action is fast and reliable, the system configuration is simple and adaptable, and it is an ideal bus protection solution at present.
The arc protection system can be connected to several arc light signals and current signals transmitted by arc sensors. Arc sensors can be placed anywhere in switchgear, usually in the compartments of the switchgear or along the busbar. The main action of arc protection is based on two different factors caused by faults: arc light and current increment. A trip command is issued when both arc and current increments of a specific intensity are detected and the location of the fault can be displayed.
System features
It adopts 32-bit industrial-grade microprocessor, which has fast speed and high precision.
Large screen LCD display, friendly interface, easy to operate.
Key components can be imported high-quality products.
With fault hard positioning, soft positioning function.
The unique fast current algorithm ensures the fast and reliable current criterion.
Arc-flash signals can be transmitted serially between acquisition units, allowing the number of monitoring points to be arbitrarily increased and greatly reducing the cost of transmitting optical fibers.
The main unit has built-in power supply module and current acquisition module, which is easy to install and use, and has high reliability.
The main unit and the acquisition unit have a dual connection of optical fiber and communication, which can quickly transmit fault arc signals and data transmission.
Fully digital design, no need to pull the code switch and potentiometer mechanical components when setting parameters, high precision, no vibration, wear and other hidden dangers.
Multiple communication interfaces realize flexible networking solutions.
ESBEL-QGW-800I arc acquisition unit
As the acquisition unit of arc protection, the unit provides 8 arc acquisition inputs and 8 outputs, collects arc light by probe mode, and transmits the signal to the main unit through optical fiber, and has a communication port to transmit data with the main unit. When there are multiple acquisition units, the arc signal is transmitted in serial mode between each acquisition unit, and finally transmitted to the main unit.
ESBEL-QGW-800II rectifier cabinet acquisition unit
As the acquisition unit of rectifier cabinet arc protection, the unit collects arc light by optical strip, and transmits the signal to the main unit through optical fiber, and has a communication port to transmit data to the main unit. When there are multiple acquisition units, the arc signal is transmitted in serial mode between each acquisition unit, and finally transmitted to the main unit. The back-end subdiagram of the device is the same as that of the ESBEL-QGW-800I.
ESBEL-QGW-800III feeder protection unit
The unit is used independently as a feeder-type arc protection unit, each unit **** can provide up to 3 arc acquisition inputs, using the probe method to collect arc light, when the arc in the feeder cabinet jumps open the circuit breaker in the feeder cabinet.
Comparison with similar products at home and abroad
序号 | 技术要点 | ESBEL-QGW | 国内外同类产品 |
1 | 系统组成 | 主单元一体化设计,适于回路独立安装。独立的采集单元。 | 由主控、弧光、电流、电源等模块组成,设计安装复杂,可靠性低。 |
2 | 故障定位 | 除通讯外,每路弧光输入对应一路继电器输出实现故障硬定位。 | 只能通过通讯方式实现故障定位。 |
3 | 弧光信号 | 采用串行方式传输,检测点可进行无限扩展。 | 采用并行方式,检测点受输入口个数的限制。 |
4 | 人机界面 | 大屏幕液晶,汉字菜单,界面友好,易于操作。 | 指示灯、数码管或英文显示。 |
5 | 参数设置 | 所有设定均在液晶界面中操作,***简便,可靠性高。 | 拔码开关或机械旋钮,精度低,有振动和磨损隐患。 |
6 | 通讯组网 | 提供两路通讯接口,并支持ModBus@RTU、ProfiBus、CAN、IEC103、IEC104等多种通讯规约。 | 通讯接口及支持规约单一。 |
ESBEL-QGW-800后端子定义
端子名称 | 定义功能 | 备注 |
弧光输入1、弧光输入2、弧光输入3 | 接收弧光信号 | |
X1-1、X1-2 | 监控系统通讯口1 | 用于通讯组网 |
X1-3 | 通讯地 | |
X1-4、X1-5 | 监控系统通讯口2 | |
X2 | 三相电流采集 | |
X3-1 | 公共端 | |
X3-2 | 远方复归 | |
X3-3、X3-4 | GPS输入接口 | 用于系统同步 |
X3-5、X3-6、X3-7 | 与采集单元通讯接口 | |
X4-1、X4-2 | 跳闸出口1 | 两个出口同步输出 |
X4-3、X4-4 | 跳闸出口2 | |
X4-5、X4-6 | 报警出口 | |
X4-7、X4-8 | 断路器失灵保护出口 | |
X4-9、X4-10 | 装置自检故障出口 | |
X4-11、X4-12、X4-13 | 装置电源 |
ESBEL-QGW-800I后端子定义
端子名称 | 定义功能 | 备注 |
弧光信号OUT | 弧光故障发生时发出光信号 | |
弧光信号IN | 接收来自其他采集单元的光信号 | |
弧光输入1、弧光输入2 | 采集弧光 | |
弧光输入3、弧光输入4 | ||
弧光输入5、弧光输入6 | ||
弧光输入7、弧光输入8 | ||
X1-1、X1-2、X1-3 | 与弧光采集主单元通讯接口 | |
X1-4、X1-5 | 弧光输入1检测到弧光时出口动作 | |
X1-6、X1-7 | 弧光输入2检测到弧光时出口动作 | |
X1-8、X1-9 | 弧光输入3检测到弧光时出口动作 | |
X1-10、X1-11 | 弧光输入4检测到弧光时出口动作 | |
X1-12、X1-13 | 弧光输入5检测到弧光时出口动作 | |
X1-14、X1-15 | 弧光输入6检测到弧光时出口动作 | |
X1-16、X1-17 | 弧光输入7检测到弧光时出口动作 | |
X1-18、X1-19 | 弧光输入8检测到弧光时出口动作 | |
X1-20 | 空位 | |
X1-21、X1-22、X1-23 | 装置电源 |
装置后端子定义
端子名称 | 定义功能 | 备注 |
弧光输入1、弧光输入2、弧光输入3 | 接收弧光信号 | |
X1-1、X1-2 | 监控系统通讯口1 | 用于通讯组网 |
X1-3 | 通讯地 | |
X1-4、X1-5 | 监控系统通讯口2 | |
X2 | 三相电流采集 | |
X3-1 | 公共端 | |
X3-2 | 远方复归 | |
X3-3、X3-4 | GPS输入接口 | |
X4-1、X4-2 | 跳闸出口1 | 两个出口同步输出 |
X4-3、X4-4 | 跳闸出口2 | |
X4-5、X4-6 | 报警出口 | |
X4-7、X4-8 | 断路器失灵保护出口 | |
X4-9、X4-10 | 装置自检故障出口 | |
X4-11、X4-12、X4-13 | 装置电源 |
Device dimensions and mounting cut-outs
sensor
Note: The unit dimensions and mounting cut-out dimensions of ESBEL-QGW-800, ESBEL-QGW-800I., ESBEL-QGW-800II., ESBEL-QGW-800 III are the same.