A switchgear assembly is provided with an integrated arc flash venting system. The switchgear assembly comprises a circuit breaker section including an arc flash vent stack having blow open flaps disposed on a switchgear roof to exhaust arc flash gases and contaminants away from a front of the circuit breaker section, towards a rear of the circuit breaker section and a top of the circuit breaker section. The circuit breaker section includes a circuit breaker compartment having a back wall with a back vent opening for the passage of all the arc flash gases and contaminants. The circuit breaker section further includes a bus compartment. All of the arc flash gases and contaminants pass through the back vent opening in the circuit breaker compartment and into the bus compartment which forms a single pathway for channeling all of the arc flash gases and contaminants to the arc flash vent stack.

A switchgear assembly is provided with an integrated arc flash venting system. The switchgear assembly comprises a circuit breaker section including an arc flash vent stack having blow open flaps disposed on a switchgear roof to exhaust arc flash gases and contaminants away from a front of the circuit breaker section, towards a rear of the circuit breaker section and a top of the circuit breaker section. The circuit breaker section includes a circuit breaker compartment having a back wall with a back vent opening for the passage of all the arc flash gases and contaminants. The circuit breaker section further includes a bus compartment. All of the arc flash gases and contaminants pass through the back vent opening in the circuit breaker compartment and into the bus compartment which forms a single pathway for channeling all of the arc flash gases and contaminants to the arc flash vent stack.

A switchgear assembly is provided with an integrated arc flash venting system. The switchgear assembly comprises a circuit breaker section including an arc flash vent stack having blow open flaps disposed on a switchgear roof to exhaust arc flash gases and contaminants away from a front of the circuit breaker section, towards a rear of the circuit breaker section and a top of the circuit breaker section. The circuit breaker section includes a circuit breaker compartment having a back wall with a back vent opening for the passage of all the arc flash gases and contaminants. The circuit breaker section further includes a bus compartment. All of the arc flash gases and contaminants pass through the back vent opening in the circuit breaker compartment and into the bus compartment which forms a single pathway for channeling all of the arc flash gases and contaminants to the arc flash vent stack.

A switchgear assembly is provided with an integrated arc flash venting system. The switchgear assembly comprises a circuit breaker section including an arc flash vent stack having blow open flaps disposed on a switchgear roof to exhaust arc flash gases and contaminants away from a front of the circuit breaker section, towards a rear of the circuit breaker section and a top of the circuit breaker section. The circuit breaker section includes a circuit breaker compartment having a back wall with a back vent opening for the passage of all the arc flash gases and contaminants. The circuit breaker section further includes a bus compartment. All of the arc flash gases and contaminants pass through the back vent opening in the circuit breaker compartment and into the bus compartment which forms a single pathway for channeling all of the arc flash gases and contaminants to the arc flash vent stack.

A gas circuit breaker includes: a fixed arc contact extending along an operating axis; a moving arc contact allowed to move to a position where the moving arc contact contacts the fixed arc contact and a position where the moving arc contact is separated from the fixed arc contact; a frame forming a puffer chamber around the moving arc contact; a nozzle having a cylindrical shape centered on the operating axis, the nozzle being fixed to the frame and projecting in a direction toward the fixed arc contact from the moving arc contact; and an arc extinction assisting portion provided on an inner surface of the nozzle and made of an ablation material. The nozzle and the arc extinction assisting portion are provided with a fall-off preventing portion to prevent the arc extinction assisting portion from falling off the nozzle.

The invention relates to medium- or high-voltage, gas-insulated electrical apparatus (10) comprising: a hermetically sealed chamber (12) filled with a dielectric gas, the gas containing at least one of fluoronitrile, carbon dioxide, dinitrogen or dioxygen; at least two electrical contacts (16, 20) arranged coaxially with a main axis (A) of the chamber (12), of which at least one (20) can move axially inside the chamber (12) between a closed position in which the two contacts (16, 20) are in electrical contact with one another and an open position in which the contacts (16, 20) are located at a distance from one another; and a cut-off mechanism (14) for extinguishing the electric arc that forms between the two contacts (16, 20) as the at least one moving contact (20) moves from the closed position into the open position. The cut-off mechanism is of the rotating arc type.

A gas circuit breaker includes: a fixed arc contact extending along an operating axis; a moving arc contact allowed to move to a position where the moving arc contact contacts the fixed arc contact and a position where the moving arc contact is separated from the fixed arc contact; a frame forming a puffer chamber around the moving arc contact; a nozzle having a cylindrical shape centered on the operating axis, the nozzle being fixed to the frame and projecting in a direction toward the fixed arc contact from the moving arc contact; and an arc extinction assisting portion provided on an inner surface of the nozzle and made of an ablation material. The nozzle and the arc extinction assisting portion are provided with a fall-off preventing portion to prevent the arc extinction assisting portion from falling off the nozzle.

A switching device includes an electrode housing having an opening; a first electrode provided inside the electrode housing; and a second electrode that fits in the opening such that the second electrode comes into and out of contact with the first electrode. The electrode housing generates an ablation gas through an arc generated between the first electrode and the second electrode. Until the first electrode and the second electrode become separated by a certain distance, a gas including the ablation gas is retained in an enclosed space defined by the first electrode, the second electrode, and the electrode housing. When a distance by which the first electrode and the second electrode are separated from each other exceeds the certain distance, the gas in the enclosed space is discharged through a gap defined between the opening and the second electrode, such that the gas is blown onto the arc.

A switching device includes an electrode housing having an opening; a first electrode provided inside the electrode housing; and a second electrode that fits in the opening such that the second electrode comes into and out of contact with the first electrode. The electrode housing generates an ablation gas through an arc generated between the first electrode and the second electrode. Until the first electrode and the second electrode become separated by a certain distance, a gas including the ablation gas is retained in an enclosed space defined by the first electrode, the second electrode, and the electrode housing. When a distance by which the first electrode and the second electrode are separated from each other exceeds the certain distance, the gas in the enclosed space is discharged through a gap defined between the opening and the second electrode, such that the gas is blown onto the arc.

The invention relates to medium- or high-voltage, gas-insulated electrical apparatus (10) comprising: a hermetically sealed chamber (12) filled with a dielectric gas, the gas containing at least one of fluoronitrile, carbon dioxide, dinitrogen or dioxygen; at least two electrical contacts (16, 20) arranged coaxially with a main axis (A) of the chamber (12), of which at least one (20) can move axially inside the chamber (12) between a closed position in which the two contacts (16, 20) are in electrical contact with one another and an open position in which the contacts (16, 20) are located at a distance from one another; and a cut-off mechanism (14) for extinguishing the electric arc that forms between the two contacts (16, 20) as the at least one moving contact (20) moves from the closed position into the open position. The cut-off mechanism is of the rotating arc type.