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Coal mine power supply anti-tripping system

At present, in the underground high-voltage power supply system of coal mine, the distance of the power supply line is short, and the short-circuit protection time of the off-line switch of the ground substation is small. If a short-circuit fault occurs, the multi-stage switch is often tripped at the same time, which leads to a large area of underground power outage and seriously affects the safety production of the mine.

Keywords:

Coal mine power supply anti-tripping system


DESCRIPTION

Product use

At present, in the underground high-voltage power supply system of coal mine, the distance of the power supply line is short, and the short-circuit protection time of the off-line switch of the ground substation is small. If a short-circuit fault occurs, the multi-stage switch is often tripped at the same time, which leads to a large area of underground power outage and seriously affects the safety production of the mine.

At present, the problems of leap-over tripping, leakage protection, energy efficiency assessment and intelligent early warning in coal mines have become technical problems restricting coal safety production. It is imperative to solve these problems and improve the intelligence and reliability of coal mine power supply system. The system is mainly used in the underground high-voltage power supply system of coal mine. On the basis of the conventional three-stage overcurrent protection and two-stage zero-sequence protection function, the longitudinal online communication network is established, the automatic fault point identification algorithm is added, and the nearest switch of the fault point is accurately switched off when the fault occurs, so as to reliably solve the problem of large-scale underground power outage caused by multistage switch tripping caused by short circuit and leakage.

Main feature

According to the network of the system, the anti-tripping function of the high-voltage power supply system in well and well is realized through optical fiber transmission. The anti-tripping and power monitoring system adopts a dedicated network and all-fiber communication mode, the communication signal is not interfered, the equipment communication interface and the number of fiber cores are redundant;

The logic judgment of the anti-tripping system is reasonable, the operation mode is flexible, and it can adapt to the operating condition of any segment or no segment of the high-voltage bus. And when the operating condition of the bus changes, there is no need to change any wiring;

The built-in power supply network relationship automatic identification algorithm ensures that the anti-jump relationship is automatically identified and adjusted with the dynamic change of the power supply structure, and the fault location is more rapid, accurate and reliable.

Switch between the anti-tripping function and the conventional protection function automatically, and switch to the conventional protection mode automatically when the network communication is abnormal, so as to avoid the switch cabinet moving and not moving caused by the network fault;

System fault information sharing, with good fault selectivity and quick;

The protection device and optical fiber hub have the function of optical fiber fault alarm, and can be compatible with the power grid monitoring system; High speed optical fiber communication network is adopted to solve the problem of electromagnetic interference and data transmission speed.

Easy to install and debug, just follow the diagram for fiber connection, without any additional Settings; The system is easy to expand, does not need to change the original system protection communication, and will not have any impact on the original system;

Adopt wired communication (RS485, CANBUS, ETHERNET, etc.), wireless communication (RFID, LORA, NB-IOT, 4G/5G) and other communication networking technologies and various intelligent terminals, apps, cloud platforms and other technologies to achieve intelligent power supply;

Fiber differential protection adopts the original "comprehensive phase comparison method" anti-TA saturation technology, according to the characteristics of the line fiber differential protection using the transmission of analog vector exchange data, the integration of the fault in the area, the fault out of the area and the difference in the phase relationship of the current on both sides of the line at TA saturation, without sacrificing the operation sensitivity of the device. The anti-TA saturation performance and action reliability of the device are effectively improved, and the problem of anti-TA saturation and protection sensitivity cannot be taken into account by traditional differential protection is perfectly solved.

Fiber differential protection and network current protection system are applied together, that is, fiber differential protection is used to realize fault isolation between incoming and outgoing lines of each substation, and network current protection is used inside the substation.

The network is simple, the construction amount is small, only one communication cable is needed for intra-station communication, and the mode of combining cable and optical cable can be used for inter-station communication. Wide range of use, not only suitable for new mines, but also convenient for old switch transformation;

The anti-tripping system has independent operation capability, and the system can operate independently from the power monitoring system, and any failure will not cause the entire system to break down.

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Longyuan Xinke Electric Co., Ltd


+86-391-6836868

+86-391-2193665

Add:Zone B, Tiantan Venture Park, High tech Zone, Jiyuan City, Henan Province

Tel:+86-391-6835588

Email:lyxkdq@163.com

 

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Who are we?

The company is committed to providing advanced technology, stable quality, safe and reliable mining explosion-proof electrical equipment and automation systems for the mining industry. The company's products cover nearly 100 specifications and models of various high and low voltage switches in coal mines, and are suitable for various application scenarios in Electrical substation, roadways, and mining faces.

Longyuan Xinke Electric Co., Ltd

+86-391-6836868

+86-391-2193665

Add:Zone B, Tiantan Venture Park, High tech Zone, Jiyuan City, Henan Province

Tel:+86-391-6835588

Email:lyxkdq@163.com

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