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Problems and solutions of distribution transformer protection

The author: Shenzhen city science and Technology Co. Ltd.issuing time:2017-07-07Pageviews:1077SmallInBig

Distribution transformer protection problems and solutions 10 kV distribution transformer protection problems 10 kV distribution transformer protection configuration mainly circuit breaker load switch or load switch and fuse. Load switch investment, but not breaking short-circuit current, rarely used; despite its good technical performance, but the equipment investment is high, the use of complex, wide applications of reality; the protection configuration of load switch and fuse combination, which can avoid the circuit breaker operation is complex and expensive, make up the load switch cannot open fault current shortcomings, and can satisfy the needs of actual operation, the configuration can be used as protection of distribution transformer. But for the distribution transformer capacity is relatively large, equipped with gas relay, circuit breaker need can be matched with gas relay, can effectively protect the transformer when necessary, zero sequence protection, these issues are worthy of attention.
Text label:深圳配电变压器,配电变压器厂家,宝安配电变压器厂家
Problems and solutions of distribution transformer protection
Distribution transformer protection problems and solutions 10 kV distribution transformer protection problems 10 kV distribution transformer protection configuration mainly circuit breaker load switch or load switch and fuse. Load switch investment, but not breaking short-circuit current, rarely used; despite its good technical performance, but the equipment investment is high, the use of complex, wide applications of reality; the protection configuration of load switch and fuse combination, which can avoid the circuit breaker operation is complex and expensive, make up the load switch cannot open fault current shortcomings, and can satisfy the needs of actual operation, the configuration can be used as protection of distribution transformer. But for the distribution transformer capacity is relatively large, equipped with gas relay, circuit breaker need can be matched with gas relay, can effectively protect the transformer when necessary, zero sequence protection, these issues are worthy of attention.
Solution regardless of ring network power supply unit in the 10 kV, or end users in high voltage power distribution unit, protection configuration load switch fuse combination by heightening the breaking capacity of the backup limiter, can provide the rated load current, and disconnect the short circuit current, and has the performance of the transformer and air, can effectively protect the distribution transformer. Therefore, recommend the use of load switch fuse combination high interrupting capacity backup limiting configuration, as the means of protection protection of distribution transformer. Standard GB 14285, "technical regulations for relay protection and safety automatic equipment" stipulates that when the protection equipment of distribution transformer is selected, when the capacity is equal to or greater than 800 kVA, the circuit breaker with relay protection device shall be selected. For this provision, it can be understood as based on the following two needs. Distribution transformer capacity reached 800 kVA and above, in the past most of the use of oil immersed transformer, and is equipped with gas relay, breaker can be matched with gas relay, so as to effectively protect the transformer. The device is larger than 800kVA users, the single-phase grounding fault leads to zero sequence protection action caused by various reasons, so that the circuit breaker tripping, fault separation, and did not cause the change of electrical feeder circuit breaker action, affect the normal power supply to other users. The standard also clearly stipulates that even if a single transformer does not meet this capacity, but if the user''''s distribution transformer total capacity of 800 kVA, but also to meet this requirement.

2017-07-07 1077People browse
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