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Appendix 2. Measurement requirement of water
content in SF6 circuit breaker
Test item
Standard (uL/L
，
20
℃
)
SF6 circuit breaker leave factory and overhaul
(before the whole assembly) should be measure
the dew point value of Opening unit and support
unit.
≤150
The water value of the circuit breaker is measured
at the interface of the bottom part of the support.
≤150
The water value of the circuit breaker is measured
at the interface of the bottom part of the support
when running. Test cycle according to the "pre test
procedures" provisions.
≤200
If necessary (breaking unit leakage, the
disintegrating disconnect unit) SF6 circuit breaker
open breathe chamber containing dew point value
individually measured by the connecting box self
sealing joints measured when running.
≤300
