Application of intelligent protector RPC2701 in flameproof vacuum feeder switch for mine
In order to ensure the safe power supply in underground coal mine, the mine power supply system generally adopts a variety of protection measures such as overcurrent protection, leakage protection and grounding protection, among which leakage protection is an important measure to prevent personal electric shock. From a safety point of view, no matter what kind of grounding method is used, the leakage protection device must be installed in the high-voltage grid and low-voltage grid. The purpose of leakage protection is to prevent electrical accidents caused by personal shock and leakage current by cutting off the power supply. The safety regulations of coal mine in China stipulate that the selective detection leakage protection device should be installed in the high-voltage feed line of the mine substation, and the detection leakage protection device with leakage lock should be installed in the low-voltage feed line of the mine.
2 Performance description of the intelligent protector RPC2701
In view of the actual situation of harsh working environment and large electromagnetic interference in coal mines, Beijing Lanpufeng Technology Co., Ltd. specially developed the intelligent protector RPC2701 for low-voltage power equipment in coal mines. The intelligent protector RPC2701 based on PLC technology is a highly reliable PLC protector with multiple functions such as integrated relay protection, comprehensive measurement and control and data communication. It is installed in the explosion-proof cabinet of power equipment and is suitable for various voltage levels such as 380V, 660V, 1140V and 3300V. It can meet the needs of various rated current feed switches, starters, low voltage head of mobile transformers, dual dual speed switches and other mining power equipment.
The control and protection signal of the intelligent protector RPC2701 can be directly sampled into the protector, which has the characteristics of high protection accuracy, fast reaction speed and high reliability. It can complete the protection functions of overvoltage, undervoltage, overload, short circuit, leakage, ultra-mild three-phase imbalance, etc. It can monitor the insulation resistance of the power grid, and has the function of simulating leakage and short circuit test. The zero sequence direction Angle, total active power and power factor can be calculated, and the network communication can also be carried out. The input and output channels of the intelligent protector RPC2701 include 8 DI channels, 6 DO channels and 1 voltage type AI, which can meet the protection function of the feed switch without channel expansion, which is not only low cost, but also high stability. The front exterior of the smart protector RPC2701
The intelligent protector RPC2701 can directly collect signals such as three-phase voltage, three-phase current, zero-sequence voltage, zero-sequence current, system voltage and insulation resistance. In use, it is not necessary to convert the AC signal to the DC standard signal for sampling, but to directly sample the AC signal, that is, directly send the AC signal to the analog input channel of the intelligent protector RPC2701, so as to achieve AC sampling.