《转载》小型直流断路器级差概念及测试报告

A,Poor concept

1, it security [2014] no. 2014:

18.6.1 protection device dc air switch, ac air switch should be with the switch at the next higher level and always keep differential relationship road air switch, prevent due to the next level power supply failure, expanding the scope of the loss of electrical components.

22.2.3.13 battery protection appliances, should use fuse, circuit breaker should be adopted, in order to make sure the battery protection electrical circuit breaker and load differential with requirements.

22.2.3.14 except battery export total fuse gradually replaced the existing operation of the fuse for the dc circuit breaker.When the load in dc circuit breaker with battery export total fuse, should consider the different motion features, differential do appropriate adjustments.

22.2.3.21 strengthen dc circuit breaker, the lower the differential between cooperate to run maintenance management.New or modified generator, transformer substation, power plant booster station dc power supply system, dc circuit breaker should be differential test.

2, DLT (5044-2014 power dc power supply system design technical procedures:

See appendix A dc circuit breaker selection (supervisor breaker selection requirements)

Stripes: 5 protection and surveillance

3 because of the dc circuit built faster than fuse fusing, when fuse installed in dc circuit breaker at the next lower level, differential requirement is big, even so, it is hard to achieve selective action, so, do not allow the dc circuit breaker installed before the fuse.

3, DL/T 459-459 "electric power system dc power supply cabinet order technical conditions"

5.3.2.4 dc circuit breaker, fuse shall have a second characteristic curve, with the supervisor should be more than 2 levels of differential.

4, state grid corporation "grid major anti-accident measures 18 2012

5.1.1.15 except battery export total fuse gradually replaced the existing operation of the fuse for dc circuit breaker. When the dc circuit breaker with battery export total fuse, should consider the different motion features, differential do appropriate adjustments.

15.7.17.6 dc total installed fuse output circuit, dc shunt installed automatic switch, must ensure that the fuse with small air switch selectively to cooperate.

Second, the unit test report

Test standard: GB 10963.2 2008 household and similar places with overcurrent protection circuit breaker Part 2

Third, differential test report

Fourth, Ann s characteristics of dc circuit breaker

GMB32 protection features, for example: (3)