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江蘇春晨電纜有限公司
主營產(chǎn)品： 電機引接線，高壓電機引接線，JFEYH高壓電機引接線 |
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江蘇春晨電纜有限公司
主營產(chǎn)品： 電機引接線，高壓電機引接線，JFEYH高壓電機引接線 |
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更新時間：2017-07-03 08:29:10瀏覽次數(shù)：468
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江蘇春晨電纜有限公司：http://www.omgrnib.cn/st161256/
JBF電機引接線江蘇春晨電纜有限公司專業(yè)生產(chǎn)JBF電機引接線，電機繞組引接線，電機繞組引接軟線 軟電纜適用于*地與電機繞組連接并引出機殼或繞組與電機上的接線柱連接用電纜。其*工作溫度zui高為70℃，敷設(shè)時zui大彎曲半徑大于電纜外徑的4倍，
The so-called sound detection method is based on the sound of the breakdown of the cable to find the sound, the method for the high voltage cable core line on the insulation layer flashover discharge is more effective. The equipment used in this method is DC voltage withstand test machine. Circuit wiring as shown in Figure 1, where the SYB for the high voltage test transformer, C for the high voltage capacitor, ZL for the high voltage silicon rectifier stack, R limit flow resistance, Q for the discharge ball gap, L for the cable core line. When the capacitor is charged to a C voltage, discharge ball gap of cable fault in the fault at the core line, cable line and the insulation layer discharge "Zi Zi," the spark discharge acoustic, again in the clutter noise when the sound is the least, by hearing aid or medical stethoscope and other audio amplifier equipment search. Look at the pickup close to the ground to move slowly along the cable, when the "Zi Zi," acoustic maximum, is the point of failure. Use this method must pay attention to safety, in the test equipment and cable ends should be set up to monitor.
2、電橋法。電橋法就是雙臂電橋測出電纜芯線的直流電阻值，再準確測量電纜實際長度，按照電纜長度與電阻的正比例關(guān)系，計算的故障點。該方法對于電纜芯線間直接短路或短路點接觸電阻小于1Ω的故障，判斷誤差一般不大于3m，對于故障點接觸電阻大于1Ω的故障，可采用加高電壓燒穿的方法使電阻降至1Ω以下，再按此方法測量。采用電橋法時應(yīng)保證測量精度，電橋連接線要盡量短，經(jīng)徑要足夠大，與電纜芯線連接要采用壓接或焊摟，計算過程中小數(shù)位要全部保留。
2, bridge method. Bridge method is to measure the DC resistance of the cable core wire, and then accuray measure the actual length of the cable, in accordance with the length of the cable and the positive ratio of resistance, the calculation of the fault point. The method for fault cable between direct short circuit or short circuit point contact resistance is less than 1, the general judgment error is not greater than 3m, the fault point contact resistance is greater than 1, the method of burning through the heightening of voltage resistance is reduced to 1 the following, according to the measurement. When the bridge method is used to ensure the accuracy of the measurement, the bridge connecting line should be as short as possible, the diameter should be large enough, and the cable core wire connection to the use of compression or welding arm, the calculation process of small and medium-sized to all retain.
3、電容電流測定法。電纜在運行中，芯線之間、芯線對地都存在電容，該電容是均勻分布的，電容量與電纜長度呈線性比例關(guān)系，電容電流測定法就是根據(jù)這一原理進行測定的，對于電纜芯線斷線故障的測定非常準確。測量電路如圖4所示，使用設(shè)備為1～2kVA單相調(diào)壓器一臺，0～30V、0.5級交流電壓表一只，0～100mA、0.5級交流毫安表一只。
3, capacitive current measurement method. The cable is in operation, the core line between and core are capacitance on, the capacitor is evenly distributed, and the capacitance of the cable length is linear proportional relationship, is based on the principle of determination of capacitance current measurement, for the determination of cable core wire disconnection fault is very accurate. The measuring circuit as shown in Figure 4, the use of equipment for 1 ~ 2kVA single phase voltage regulator, 0 ~ 30V, 0.5 AC voltage meter, a 0 ~ 100mA, 0.5 AC Ma Table 1.
測量步驟：
Measurement steps:
