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35kV substation intelligent choice of arc-suppression coil and run the analysis


Put into operation on 20 January. Jinping station put into operation after the neutral point voltage of 127V, the measured volume flow 27.1A; Yanwumiao station neutral point voltage of 133V,herve leger toronto, the measured volume flow 22.5A. Run more than two years a total of 25 substations Jinping single phase,herve leger skirts, Iwaya temple there were 21 substations single-phase, KD. XH-type arc-suppression coil is moving quickly dried sea Sheng Sheng Plastic * 43 June 2008, Hubei Power Vo1.32No3Jun. 2008 as compensation accurately and efficiently to prevent arc over voltage and over-voltage ferromagnetic resonance,MBTシューズ 販売店, has never been as result of arc suppression coil neutral point voltage abnormal increase of the phenomenon. 4.1 Ground Station recorded two Petersen-coil statistics put into operation in single-phase to record statistics in Table 1 and Table 2 (KDXH system ground record in the voltage and current are measured). Table l grid is grounded to a single-phase distribution of the residual current IL t l0m4.2 ground record analysis by the 46 ground stations cf compensation records and operating records can be seen: single-phase ground fault, neutral point voltage 3836.9V ~ 21704.5V,vibram five fingers outlet, is 0.17Uh ~ 1.07Uh (h for the phase voltage), a large span of its value. Petersen-coil operation, the device output compensation current minimum 1.5A, up to 26.9A. Ground at the residual flow 2A accounted for 8.6%, the largest of only 3.4A. KD-XH-type arc-suppression coil and reliable operation, accurate compensation, effectively eliminating all kinds of ground fault. Separated by 3 ~ 10s, single-phase ground fault up to 7 times, in actual operation (especially the thunderstorm season) occurred on several occasions a very short time interval of single-phase ground fault. KD-XH-type arc-suppression coil of these failures can quickly provide the compensation current, which can automatically eliminate it. Most of the ground fault is transient fault (<28 accounted for 63%, <10s accounted for 86.9%), compensated automatically eliminated, did not cause tripping. A small number of non-transient failure, arc of timely and accurate compensation for making the earth fault current greatly reduced, effectively prevent the expansion of the accident and equipment damage, some due to compensation and can automatically eliminate failure and avoid the trip. KDXH-type arc system put into operation and never had any over-voltage phenomena, have never occurred because KD-XH-type arc system caused by abnormal system voltage imbalance, stable operation can be 44 * by. 4.3 Two typical examples of typical earth ground are given in Table 3, Table 4. Table 3 Typical grounding a (Jinping Station) Date Start time End time recommended voltage ILIC residual flow 820067709:35:5409:53:1521224.223.122.41.3222008532 0:41:552 O46: l120635.423.922.11 .8 Analysis: The first 8 times as high voltage 35kV substation within the glass insulation breakdown TA accident, 22 times for sub-Jin line 35kV high voltage sub-station TA Long aging insulation breakdown (Attendant after artificial removal of line ground disappears, the inspection found that the point of failure). Two incidents are due to arc precise compensation, greatly reducing the residual flow, a ground fault to prevent the expansion. Table 4 Typical grounding of the two (Iwaya Temple Station) recommended date start time end time voltage ILIC residual flow analysis: This is a typical intermittent transient earth, KD-XH demonstrated the rapid input, accurate compensation, fast out of the unique advantages. The performance on multiple lines, separated by a very short time of several ground-fault compensation is necessary. 5 Conclusion With the continuous development of power system, the old arc-suppression coil in the operation revealed its inherent shortcomings. Lack of capacity of the old arc, it is not put into the system to use, otherwise this will cause a serious security threat. The transformation of the arc and selection, compensation should be used with automatic tracking function of a smart arc system. KD-XH-based high-speed short-circuit impedance transformer type arc system in the company's use of 35kV power grid is successful, it completely solved the neutral point displacement voltage is too high problem, effective solution to the medium voltage power grid over-voltage arc harmony vibration over-voltage, making the system more stable and reliable, and it's fast and accurate compensation, effectively eliminating the transient fault, especially for short time interval of several ground fault; a small number of non-transient fault, can greatly reduce the residual current ground and reduce equipment damage, failure to prevent or even eliminate some of the failure to expand and improve the reliability, economic benefits and create a lot of money.
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