EKL-2 short-circuit fault indicator Guang Shan 1 Introduction EKL-2 cable type fault indicator is mounted on the power cable distribution lines, changed me, RMU, branch box, used to indicate the flow of fault current devices. Once the line short-circuit fault line patrol officers can take advantage of the red alarm indicator on the display to quickly determine the fault section, branch and point of failure. Completely change the past blindly transmission line, power transmission sub-closing test to find fault backward approach, greatly improve work efficiency, reduce outage time, effectively improve the reliability and economic efficiency. 2, the design principles EKL-2 cable type fault indicator is 6-110KV line means for detecting a short circuit fault point. Is the use of the line short-circuit fault current positive mutation and power lines to detect the fault. Figure a, EKL-2 cable type fault indicator when the line is normal, the green light flashes. When the circuit shown in two short-circuit fault, the fault indicator sensitive to fault current, the indicator flashes red. As shown below, according to the two-phase indicator line B # 3 # 2,5,8 and 3,6,9-line C-phase indicator flashes red, and 11, 12 indicator flashes green, you can quickly determine the fault for D points. Indicator reset time has 6,8,12,24,48 hours optional. Figure II, 6-110KV fault indicator diagram 3, the action criterion (1) It≥160A It mutant amount current starting value (2) △ ??I≥0.5I0 △ I is the current rate of change in the front line short circuit current I0 (3) I = 0 I was after a line fault current (4) 0.06S≤ △ T≥3S △ T is the current time of 4 mutations, the application applies 6-110KV EKL-2 type of distribution boxes, RMU, box changes and other cable systems. 5. Technical features 1) the action is accurate, strong anti-jamming capability: signal from the line, inrush current, high harmonics, current fluctuations, especially the impact of distributed capacitance cable bypass. 2) Find a simple fault segments: indicator mounted directly on the distribution line, through the action of two adjacent indicator or not you can easily find fault segment. 3) automatic / manual reset: indicator according to factory setting reset time after the operation automatically returns to normal position by a fault condition; according to user needs can also be manually reset. 4) simple loading and unloading operations: No special installation tools can be charged loading indicator. 6, the installation Step one: the original state; Step two: to separate the shell and metal pieces; Step 3: Unscrew the screw; Step four: the metal parts on the cable card; Step Five: The housing and metal cards together; Step 6: Tighten the screw so that the indicator is fixed on the cable.