China 72.5kv 145kv Outdoor Hv Dcb Intelligent Disconnecting Circuit Breaker with CT Es

In switchgear, isolating distances in air combined with circuit breakers are used to protect the circuit state in the grid.
developed a device in which the isolating dis-tance has been integrated in the SF6 gas compartment in order to reduce external environmental influences.
The DCB (Disconnecting Circuit Breaker) is used as a circuit breaker and additionally as a disconnector - two functions combined in one device.
The DCB was developed on the basis of a higher-rated standard LW circuit breaker to provide the higher dielec-tric properties required. Due to the SF6-insulated discon-nector function there is no visible opening distance any-more. The proper function of the kinematic chain has been most thoroughly verified. The closest attention was paid to developing a mechanical interlock which guaran-tees that the circuit breaker remains in the open position when used as a disconnector.
When this mechanical interlock is activated, it is impossi-ble to close the breaker. The current status of the DCB can also be monitored electrically and is shown by clearly visi-ble position indicators.
Up to voltages of 145 kV, an additional air-insulated earth-ing switch could be mounted onto the supporting struc-ture. Its earthing function has been implemented by a well-established earthing switch with a Ruhrtal designed maintenance-free contact system.
The disconnecting circuit breakers are type-tested accord-ing to class M2 and C2 of IEC 62271-108, a specific stan-dard for combined switching devices.
By combining the strengths of our well proven product portfolio, we can provide a new type of device which ful-fills customers' needs for the highest reliability and safety, while saving space and costs at the same time.