uggs kopen 1140V system insulation monitoring devi

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1140V system, application of insulation monitoring device

. 14kV cable distribution cabinets and other electrical equipment and electrical components, due to wet weather with the rain, the voltage quality of equipment and other reasons, ground fault occurs, the oil distribution system is not set l140V insulation prosecution unit, the operator can not determine the earth fault The existence of endangering the safety of operation. \Keywords: grounding; detection; device is Linpan oil extraction plant 1140V oil distribution network, most used transformer neutral point grounding, the biggest advantages of the system is single-phase ground fault occurs, current flows through the smaller access sites does not destroy oil wells symmetry line voltage distribution network, does not affect the continuous supply of oil, we call the small current grounding system. But the oil distribution network in the 1140V, the 6/1.14kV distribution transformers, 1.14kV cable, 1.14kV 1.14kV electrical power distribution equipment and components such as electrical equipment, due to wet weather with the rain, voltage, equipment quality, etc. reason,[link widoczny dla zalogowanych], ground fault occurs, causing over-voltage,[link widoczny dla zalogowanych], relatively higher voltage insulation of electrical equipment increased the damage may be caused by weaknesses in the insulation breakdown, and then cause a short circuit, reducing the oil supply reliability. 1 Problems with the network is not set 1140V insulation oil Attorney defective design installation and grounding will cause the following problems: 1.1 oil operator can not determine the existence of a ground fault, resulting in oil leakage phenomenon occurs when the distribution cabinet endanger the safety of operation. 1.2 There is a phase to ground, the oil pump motor is still able to continue normal operation, very difficult time finding staff on duty at this time than the normal current through the motor when the large, so if the motor current increases copper losses will increase, will will lead to long-term overheating of the motor operation, as well as damage to the motor burned out the motor insulation. 2, according to the purpose of our distribution network 1140V well the actual situation, set one insulation monitoring device can alert the operator prompt attention and found quickly determine fault ground fault effectively shorten the processing time to ensure the safety of persons and equipment. 3 Principle of \The resistance of blood pressure monitoring device used to take three resistors neutral zero-sequence voltage, due to ground and leakage power distribution equipment, the neutral point of zero sequence voltage low, the use of voltage comparators to determine ground. Schematic: RABC normal operation,[link widoczny dla zalogowanych], the system voltage of the three relatively symmetric, zero-sequence voltage is zero, the voltage comparator does not work. Event of a single phase, the voltage comparator in the zero sequence voltage under the effect of movement, issued a ground fault signal. 4 results according to the principle that we trial the samples we have, through the field test can accurately determine the ground fault. The device is put into use, distribution can be well grounded to detect the situation and make rectification and improve the value of the duty officers working security,[link widoczny dla zalogowanych], avoid burning the motor and transformer accident.
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