Precautions For Use Of Sf6 Circuit Breaker Operating Mechanism

1 Differences
1.1 Differences in pressure gauge manufacturing standards
(1) For sf6 circuit breaker operating mechanism produced by Chinese manufacturers or some Sino-foreign joint venture manufacturers (referred to as "the former"), the pressure numbers and pressure gauge readings in the product manuals conform to the following pressure relationship, namely:
P0＝Pg＋Pa (MPa)
P0＝Pa－Pv (MPa)
Pg＝P0－Pa (MPa)
Where: Pg-gauge pressure (MPa); P0-absolute pressure (MPa); Pa-atmospheric pressure (MPa); Pv-vacuum degree (MPa).
(2) For sf6 circuit breaker spring mechanism produced by a large Sino-foreign joint venture manufacturer (referred to as "the latter"), the pressure numbers and pressure gauge readings in the product manuals all refer to the absolute pressure P0＝Pg.