40.5kV~550kV Outdoor HV AC Live Tank SF6 Gas Circuit Breaker

Live tank SF6 gas circuit breakers application for rated voltage from 40.5kV to 550kV and rated current from 3150A to 5000A power system; Tthe single-unit structure is applied in the construction. using the minimized number of breaks and parts, make the structure simply structure and high reliability as well as long maintenance-free period.

Both opening and closing operations of spring mechanism are driven by spring force. Before operation, closing spring is charged by motor in advance while opening spring is charged during closing operation. The controlling parts of second circuit and SF6 gas density are placed in the enclosure of the mechanism.

In hydraulic operating mechanism, the disk spring is charged by oil pump driven by motor. The power of hydraulic pressure is used to complete opening/closing operation. This mechanism is provided with anti-slow opening device.

Part Ⅰ: Normal Service Conditions

Altitude: less than 1000m (3000m for extremely cold area);

Average relative humidity monthly: less than 90%;

Max. wind velocity: less than 35m/s;

Pollution class: Ⅲclass, Ⅳclass;

Ambient temperature: -35℃~40℃;

(It's satisfied under the condition of -40℃ in heavy cold area);

Max.temperature difference daily: 25K;

Earthquake intensity：9 degree;

Max. icing thickness: 20mm;

Max. radiance from sun: 1000W/m²;

Note: When the product is used out of above condition, the user and the manufacturer shall reach an agreement through coordination.

Part Ⅱ: Main Features and Advantages

a, Superior interrupting capability

Single-unit structure is applied in the construction of circuit breaker with variable break distances, which is able to meet different switching requirements. The well designed arc-extinguishing chamber can withstand either severe rising rate of the recovery voltage by a short-line fault or peak recovery voltage by breaking out-of - phase current. In switching excited current, the overvoltage is less than twice of operating voltage. No restrike or reignition occurs during switching line-charging current.

b, Reliable insulation and current-carrying capability

Because of the isolation of SF6 gas from the atmosphere, the breaker has a reliable insulating capability. SF6 gas property does not change with age and at the same time it protects the insulating parts within the gas chamber. It also prevents the contacts from oxidization and other chemical reactions as SF6 gas is stable and inert in nature when it is used together with other materials.

c, High reliability

The series of circuit breakers passed all type tests at National High Voltage Apparatus Quality Monitor and Inspection Center. The mechanical endurance is 3000 times without adjustment and 10000 times with lubrication and adjustment allowed. They also passed the electrical endurance test, breaking 20 times at rated short-circuit breaking current (40kA/50kA/63kA) during type tests.

d, Excellent operating mechanism

The spring operated mechanism is professionally manufactured with excellent performance. The hydraulic operating mechanism is also very reliable and durable.

e, Minimized maintenance work

The circuit breaker is constructed by unit structures, resulting in minimized number of breaks and parts, thus greatly reduces the inspection and maintenance work. In addition, its operating mechanism boasts advanced technology and excellent performance, the circuit breaker hardly needs any repair.

f, Excellent earthquake withstand capability

The live tank SF6 gas circuit breaker is substantially resistant to seismic shock due to its simple construction and light weight.

Part Ⅲ: Main Technical Data

Noted: 126/145kV/252kV Both have three-phase and single-phase operated circuit breaker.

Part Ⅳ: Other Technical Data

A, Spring Operating Mechanism for CB

B, Hydraulic Operating Mechanism for CB

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