I. Analysis of problems in high voltage switchgear
(1) The function of the high-voltage switchgear to prevent accidental entry into the charging interval makes the opening and closing of the cabinet door of the switchgear have a latching relationship with the grounding switch, that is, the switchgear cabinet door can be opened only after the grounding switch is closed, and the accident exposes the old model. The "five-proof" mechanical locking device of the high-voltage switchgear has imperfect problems.
(2) The problem of power inspection of high-voltage switchgear is a problem that has plagued power safety production for many years. At present, the mechanical "five-proof" locking device of the fully enclosed "five-proof" switchgear can not meet the safety regulations. After the ground wire is attached. Because in the implementation of power outage work, it must be verified that the equipment has no voltage before the grounding switch. However, the enclosed high-voltage switchgear is in a fully enclosed state. According to the normal operation method, the portable high-voltage electroscope cannot be used to inspect the equipment . Therefore, there is a method of forcibly unlocking and opening the switch cabinet door.
(3) At present, a high-voltage live display device using a xenon lamp as a display element is widely used on the switchgear. After a long period of operation, it is found that the blindness rate is high and a large amount of damage occurs in the bubble. In order to compensate for the defect, a xenon lamp operation/shutdown switch is installed on the live display device, and the switch is normally turned off, so that the entire high-voltage live display device temporarily exits operation. In this way, the high-voltage live display device is lost as a function of monitoring the line side charging.
(4) The brightness of the xenon lamp is low, especially in a bright environment where the brightness is washed away and the display is poor.
(5) Old-fashioned high-voltage live display device with mandatory electrical blocking. The locking principle is too simple. The signals output by the three-phase sensors of A, B and C are respectively half-wave rectified and directly combined to control the blocking circuit. In this way, when the system has a single-phase grounding or phase-out anomaly, the drift of the blocking control voltage may cause the device to be unable to be reliably locked and an accident of the live-grounded switch may occur.
(6) Most of the currently installed xenon lamp high-voltage live display devices are made of plastic casing and installed in the interval of high-voltage equipment. Once the switch cabinet is short-circuited and arced during operation, the high-temperature arc may melt the plastic casing of the device and injure the operation. Or maintenance personnel.
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