1, how be used and safeguard 10kV vacuum breaker

It is at present in 10kV and network of distribution of grade of the following voltage, vacuum breaker already replaced oily open circuit stage by stage, changing without oil transformed a process to produce positive effect. Compare with oily breaker, vacuum breaker is had suit to be operated often, electric life is long, the overhaul safeguards workload small, prevent light, the good point with explosion proof, moving high reliability, but outfit a few problems also should note in using a process, make its advantage gets be developinged adequately.
A, use the issue that the attention answers in safeguarding
(1) overvoltage is protected. Because vacuum breaker opens lesser electric current, when leaving to carry the small perceptual electricity such as transformer excitation electric current for nothing especially, meeting occurrence cut flows and often produce cut to shed overvoltage, and cut spreads a cost jump over big, the overvoltage of generation is taller. Additional, when vacuum breaker is opening the electric current allowing a gender of capacitor group, very inaccessible also light again without electric arc absolutely, once appear to be lighted again, also can arise to light overvoltage again. Flow to cut or light overvoltage again, need to install better with function metallic oxide lightning arrester or block to allow protector to prevent.
(2) vacuum destroys arc room vacuum is spent detect. Vacuum destroys arc room is in charge of the vacuum inside to spend is normally in 10-4 ～ 10-6Pa, grow as what vacuum destroys arc room uses time and open number increase, and the effect that suffers outside element, its vacuum is spent drop stage by stage, drop to drive ability and compression level to what certain level will affect it. Accordingly, vacuum breaker must be checked regularly in use process destroy the vacuum inside arc room canal is spent. At present examination method has:
① destroys to vitreous case vacuum arc room, OK and fixed range estimation is perambulatory examination, normal when the component surface color such as in-house screen cover should very bright, shallow blue arc is given out when switched current. Spend when vacuum drop very serious when, in-house color can become gloomy, wine arc will be given out when switched current.
② is fixed (control 3 years) undertake is versed in frequency compression experiments (42kV) . Touch a head to keep rated when activity be apart from a condition to fall, if compression is very low, and via discharging for many times ageing hind, compression is worth still standard of compression of short of regulation, with respect to the specification vacuum destroys room vacuum spends arc to drop badly already, already cannot continue to use.
(3) vacuum destroys of arc ageing. Vacuum destroys of arc room electric and ageing include voltage and electric current ageing. Before new vacuum destroys arc room leaves factory in the product, already passed ageing. But vacuum destroys arc room is deposited through period of time, as a result of the influence of a variety of reasons, its working compression level can fall, after switch manufactory is being assembled and use branch still needs to undertake voltage afresh when installation ageing and undertake is versed in frequency compression experiments below rated condition.
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