As we all know, energy is an important engine of economic development and it is also the lifeblood of the national economy. The mining industry has always been the important pillar of the energy industry. China’s mining production mainly comes from underground where the environment is harsh.For example, there are five natural disasters: water, fire, gas, coal dust, and coal seam roof. In addition, the production environment is complex and it’s easy to cause the fatal accidents.

For safety reasons, the low-voltage power distribution system in the mine adopts an IT system. It is a system that neutral is ungrounded and conductive part of the load is directly grounded (PE line). The features of the IT system is that when the first grounding fault occurs, the current of grounding fault is very small, the voltage of exposed conductive part to ground is below 50V, It is unnecessary to cut off the fault circuit immediately, so it can ensure the continuity of power supply. But at this time, the voltage of non-fault relative to ground will increase by 1.732 times, and the requirement for line withstand voltage will increase. At the same time, once a secondary grounding occurs, it will lead to a dangerous phase-to-phase short-circuit, so an insulation monitoring device should be installed which can help eliminate hidden dangers in time when the first grounding occurs.For the coal mine as the typical representative of underground environment , in the process of mining, due to limited space, long in depth, humid air, dustiness, waterlogged roadway, and many other adverse factors, it is easy to cause the cable insulation resistance and electric equipment aging and decline, the underground equipment and cables often suffer from insulation strength reduction, single-phase leakage or single-phase grounding fault, If not handled in time, it may further develop into phase to phase short circuit. As a result, Underground workers are more vulnerable to electric shock than they would be in a regular environment, and may also cause explosion of gas and coal dust.

Obviously, It has more important significance for the real-time insulation monitoring of mine IT system.

2 .國內(nèi)外絕緣監(jiān)測儀在線監(jiān)測現(xiàn)狀

Online monitoring status of insulation monitors at home and abroad

我國的電氣設(shè)計在新中國成立之初師從前蘇聯(lián)電氣規(guī)范，主要是廣泛的采用TN—C系統(tǒng)，它可以節(jié)省一根PE線，比較經(jīng)濟(jì)，但存在很多缺點，如中性線斷裂后設(shè)備外殼對地將帶220V危險接觸電壓，不能裝用RCD防電擊等等。改革開放之后我國引進(jìn)了國際電工學(xué)會標(biāo)準(zhǔn)，也隨著我國電氣技術(shù)的不斷提高，在應(yīng)用中TN-S、TT、IT系統(tǒng)得到了一定程度的推廣和應(yīng)用，以IT系統(tǒng)為例，在醫(yī)療IT方面目前應(yīng)用比較成熟，但在很多工業(yè)場合，由于對接地系統(tǒng)的理解和應(yīng)用尚不盡深入和全方面，比如煤礦井下場合比較缺乏國產(chǎn)絕緣監(jiān)測裝置就是一個證明。目前礦用井下IT系統(tǒng)的絕緣監(jiān)測裝置以進(jìn)口品牌為主，歐美等發(fā)達(dá)國家已經(jīng)較廣泛地在IT配電網(wǎng)絡(luò)中應(yīng)用絕緣檢測技術(shù)，而且經(jīng)過長期的在線運行使發(fā)達(dá)國家積累了大量監(jiān)測數(shù)據(jù)和經(jīng)驗，這是目前國內(nèi)生產(chǎn)廠家需要學(xué)習(xí)和追趕的。

但采用進(jìn)口品牌絕緣監(jiān)測裝置造價昂貴，而且人機(jī)界面往往是英文，不利于現(xiàn)場人員的使用，在這種背景下，也不斷有國內(nèi)企業(yè)逐步推出了自己的工業(yè)用絕緣監(jiān)測裝置，其中就包括了安科瑞電氣有限公司的AIM-T系列絕緣監(jiān)測儀。

At the beginning of the founding of the People's Republic of China, China's electrical design was based on the former Soviet Union's electrical code, mainly using TN-C system . It can save a PE line, which is more economical, but there are many disadvantages, such as, after the neutral line breaks, the equipment shell to the ground will have a dangerous contact voltage of 220 V, and RCD cannot be installed to prevent electric shock, etc. After the reform and opening up, China has introduced the standards of IEC, and with the continuous improvement of electrical technology in China, TN-S, TT and IT systems have been promoted and applied to a certain extent. For example, the application in medical IT is relatively mature at present, but in many industrial occasions, due to the understanding and application of grounding system is not thorough and comprehensive, for example, the lack of domestic insulation monitoring device in coal mine is a proof.At present, the insulation monitoring devices of mine underground IT system are mainly imported brands.Insulation detection technology have been widely used in IT distribution network in developed countries such as Europe and the United States. And they have accumulated a lot of monitoring data and experience after a long-term online operation. This is what domestic manufacturers need to learn and catch up with.

However, it is expensive to use imported brand insulation monitoring devices, and the human-computer interface is often in English, which is not conducive to the use of field workers. There are also domestic enterprises which have gradually launched their own industrial insulation monitoring devices, including the AIM-T series insulation monitoring devices of Acrel.

3 安科瑞工業(yè)絕緣監(jiān)測儀

Acrel industrial insulation monitor

AIM-T300

AIM-T500

AIM-T500L

AIM-T系列絕緣監(jiān)測儀主要應(yīng)用在工業(yè)場所IT配電系統(tǒng)中，主要包括AIM-T300、AIM-T500和AIMT500L三款產(chǎn)品，均適用于純交流、純直流以及交直流混合的系統(tǒng)。

其中AIM-T300適用于450V以下的交流、直流以及交直流混合系統(tǒng)，AIM-T500適用于800V以下的交流、直流以及交直流混合系。AIM-T500L則是相比AIM-T500增加了絕緣故障定位功能。

AIM-T series insulation monitor is mainly used in IT power distribution system of industrial site, including AIM-T300, AIM-T500 and AIM-T500L, which are all applicable to pure AC, pure DC and AC / DC hybrid systems.

AIM-T300 is suitable for AC, DC and AC / DC hybrid systems below 450V, and AIM-T500 is suitable for AC, DC and AC / DC hybrid systems below 800V. AIM-T500L has the function of insulation fault location compared with AIM-T500.

1）AIM –T系列產(chǎn)品的技術(shù)參數(shù)如下表所示：

The technical parameters of AIM-T series products are shown in the table below

2）AIM –T系列產(chǎn)品的典型應(yīng)用如下圖所示：

The typical application of aim-t series products is shown in the following figure:

4 小結(jié)Summary

安科瑞AIM-T系列工業(yè)用絕緣監(jiān)測儀目前已經(jīng)在礦井、紙業(yè)、船舶、冶金廠等的諸多工業(yè)場合的IT系統(tǒng)中得到了應(yīng)用，能夠?qū)崟r監(jiān)測系統(tǒng)對地的絕緣狀況，在系統(tǒng)出現(xiàn)絕緣下降或接地故障時，及時報警提醒相關(guān)人員排查故障，在應(yīng)用中起到了很好的監(jiān)控和預(yù)防效果。

At present, Acrel AIM-T series industrial insulation monitor has been applied in the IT system of many industrial occasions, such as mine, paper industry, ship, metallurgy plant, etc. It can monitor the insulation condition of the system to the ground in real time. When the system has insulation drop or ground fault, it can alarm and remind relevant person to check the fault, which has a good monitoring and prevention effect in the application.

參考文獻(xiàn) Bibliography

1.Solutions for enterprise micro-grid system

礦山井下IT配電系統(tǒng)絕緣監(jiān)測的應(yīng)用

Application of insulation monitoring of IT distribution system in mine

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