Circuit Breakers
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Circuit Breakers
LW8B-40.5 (T) outdoor SF6 High Voltage Circuit breaker
Brand: US General Electric Company
Origin: USA United States
Advantages: Vacuum
features:
LW8B-40.5 (T) type outdoor high voltage SF6 circuit breaker is a three-phase AC 50Hz outdoor high voltage electrical equipment; suitable for 40.5kV transmission and distribution system control and protection; also be used for opening and closing the contact breaker and capacitor group occasion; and included current transformers for measurement and protection.
LW8B-40.5 (T) type circuit breaker equipped with CT14 spring operating mechanism.
Circuit breaker in line with national standards GB1984-1989 "AC high voltage circuit breakers" and the International Electrotechnical Commission standard IEC60056: 1987 "high-voltage AC circuit breaker" requirements.
The main features of the circuit breaker
Breaking performance, arcing time is short, long electrical life at rated voltage continuously breaking 25 kA 20 times without repair, not replace sulfur hexafluoride gas;
Reliable insulation, can withstand the pressure gauge at zero 40.5 kV 10 minutes;
High mechanical reliability, strong closing ability, frequent operation;
Opening and closing capacitor bank current 400 ampere without renewed;
25.50 km long cut empty without renewed;
Simple structure, small size, long period without maintenance.
1. The use of environmental conditions
a Altitude: not more than 2500; m; plateau 4000 meters;
b Ambient temperature: -30 ℃ - + 40 ℃ (special requirements -40 ℃ - + 40 ℃);
c Relative humidity: daily average of not more than 95%, the monthly average of less than 90% (25 ℃);
d Winds: not more than 35 m / sec;
e filthy grade level III; Bushing creepage distance of 1050mm (1320mm) (nominal creepage distance of not less than 25 mm / kV).
f no flammable substances, the risk of explosion, chemical corrosion and severe vibration.
2. The main technical parameters
The main technical parameters 2.1 LW8B-40.5 (T) circuit breaker in Table 1.
2.2 breaker assembly adjustment parameters in Table 2.
3. The structure and working principle
3.1 parallel transmission circuit breaker (see Figure 1 shape, FIG. 3) that is L-shaped and vertical drive (see Figure 2 shape, FIG. 4) in two ways, the internal structure shown in Figure 5.
Circuit breaker ceramic column structure, phase separation, each having arc chamber pressure, gas-phase communicating through the tubing. Breaker by the partial pillar insulator, current transformers, arc chamber, absorber, gear box, connecting rods, undercarriage and spring mechanism and other components.
3.1.1 Bushing
Porcelain sets for the main circuit breaker and the insulating support member connected to the power system, because it is connected with the circuit breaker housing, belonging to one part of the pressure vessel, so the high strength, air tightness.
3.1.2 LW8B-40.5 interrupter (T) type circuit breaker is mainly composed of static contact, moving contact, porcelain sets, cylinders and vents and other components (see Figure 5), porcelain and insulated rod constitutes a move, static contact of the insulation.
3.1.3 adsorber
Adsorber for the aluminum container. LW8B-40.5 (T) type circuit breaker inhaler each mounted six, only three of them on the transmission box, three mounted in the cooling cap. Adsorber that has the F-03 molecular sieve, whose role is to adsorb sulfur hexafluoride gas in the water and low fluoride since the arc formed by the decomposition action.
