Safety protection method of vacuum on-load tap switch
A technology of on-load tap-changing and safety protection, which is applied in the direction of electric switches, prior contact arrangements, electrical components, etc., can solve the problems of reduced insulation performance, incomplete breaking, pollution of transformer oil, etc., and achieve the effect of avoiding accidents
Inactive Publication Date: 2013-12-11
SHANGHAI HUAMING POWER EQUIP CO LTD +1
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Problems solved by technology
[0005] Due to long-term use, or due to the quality problems of the vacuum tube itself, the technical performance of the vacuum tube is reduced, and the breaking is not complete, so that the isolating switch K cannot be completely disconnected and connected with the same potential. The isolating switch K is between the contacts A and B. When switching, an arc will be generated, and the arc will pollute the transformer oil in the switch, reduce the insulation performance, and cause the switch to fail
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[0014] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0015] see figure 2 , Install photosensitive elements 202, 206 near the static contacts 203, 207 of the isolating switch (that is, the A contact and the B contact of the isolating switch K), when the vacuum tube 201 or 205 cannot be normally disconnected and connected due to quality problems The disconnection or connection of the moving contact 204 or 208 and the static contact 203 or 207 of the isolating switch will generate an arc, and the photosensitive element 202 or 206 captures the optical signal generated by the arc light, see image 3 , the photosensitive element 202 or 206 captures the optical signal generated by the arc light and leads it to the optical signal input end of the photoelectric conversion device 110 arranged in the switch electric control mechanism 100 through the optical fiber, and is converted into an electrical sign...
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The invention discloses a safety protection method of a vacuum on-load tap switch. The safety protection method is characterized in that a light-sensitive element is arranged near an A contact and a B contact of an isolation switch of an on-load tap switch. The light-sensitive element is used for detecting a light signal of an arc generated by on and off of the isolation switch K and the A contact and the B contact, and the detected light signal is led to a photoelectric conversion device arranged inside a switch electric control mechanism via an optical fiber. After the light signal is photo-electrically converted by the photoelectric conversion device, the light signal is sent to a control device arranged inside the switch electric control mechanism. The switch electric control mechanism is controlled not to take action by the control device, and an alarm is performed simultaneously to notice operation staffs to maintain timely. Therefore, a switch fault is solved at an incipient phase and an accident is avoided.
Description
Technical field: [0001] The invention relates to the technical field of on-load tap changers, in particular to a safety protection method for vacuum on-load tap changers. Background technique: [0002] In the field of transformer technology, especially for large-capacity transformers, vacuum on-load tap-changers are gradually used to replace traditionally used mechanical contact on-load tap-changers. The arc extinguishing property makes the on and off of the contact occur in the vacuum bubble, avoiding the pollution of the transformer oil by the arc, and improving the switch performance and service life. [0003] A switch that uses a vacuum bubble to replace the original mechanical transition contact is called a vacuum on-load tap-changer. A typical transition circuit is as follows: figure 1 Shown: Among them, K is the isolation switch, M1 and M2 are the main on-off contacts, V1, V2, V3 and V4 are vacuum bubbles, and R1 and R2 are transition resistances. [0004] figure 1...
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Inventor 王方扬朱强
Owner SHANGHAI HUAMING POWER EQUIP CO LTD