I. OverviewLW36A-126/145 high-voltage AC Sulfur Hexafluoride Circuit Breaker is a new generation of self-powered high-voltage Sulfur Hexafluoride Circuit Breaker developed on the basis of LW36-126. The product is suitable for switching off 50 Hz and 126 kV AC power system, cutting off load current and short circuit fault current, controlling and protecting power equipment and contact lines in areas below 2500 meters above sea level. The circuit breaker uses SF6 gas (mixed SF6 and CF4 gas in alpine area) as insulation and arc extinguishing medium, adopts self-energy arc extinguishing principle, and uses spring operating mechanism. It has the characteristics of strong interrupting ability, low operation power and high reliability.
II.Type and MeaningIII. Environmental Conditions for UseNormal operating conditions of the console GB/T11022-1999 "General Technical Conditions for High Voltage Switchgear Equipment", namely:
A. Surrounding environment: +40 degrees to-40 degrees
B. Elevation not exceeding 1000m (Lw36-126G can be used for 3000m)
C. Wind pressure < 700 Pa
D. Daily temperature difference: 25 degrees Celsius
E. Sunshine Intensity: <1w/cm2
F. Seismic capacity: horizontal acceleration 0.25g
Z, Ice Coating Thickness: <1Omm
H. Degree of contamination, Grade III
I. Installation Site: Outdoor
IV. PERFORMANCE CHARACTERISTICSReliable interruption performance: With advanced self-energy arc extinguishing technology, it can interrupt 40 kA short circuit current 22 times without maintenance.
Mechanical operation performance is reliable: circuit breaker continuous operation mechanical life of 6000 times, after simple adjustment, can reach more than 10,000 times, with high operational reliability.
Reliable insulation capacity: creepage ratio of external insulation (> 3lmm/kV), strong pollution resistance, suitable for safe operation in harsh environment with altitude not exceeding 3000m, and insulating tie rod can withstand 250 kV/5min air.
Reliable sealing performance: to ensure that the annual leakage rate of sulfur hexafluoride gas is far less than 0.5%.
The dehumidification process of product parts is strict: the moisture content of SF6 is much lower than that of similar products.
The circuit breaker adopts the principle of self-energy arc extinguishing with low operation power.
The valve disc of arc extinguishing chamber is made of a new type of special alloy with high temperature resistance and light weight. Compared with the traditional material used in similar products, the air flow characteristics and breaking performance are more stable and reliable.
The nozzle is made up of imported PTFE (polytetrafluoroethylene) and other trace components. The breaking performance is stable and the burning resistance is strong.
The use of high-quality porcelain bushes has good bending resistance, advanced production technology, strict and reliable quality control, and can ensure the safe operation of circuit breakers.
The insulation tie rod of circuit breaker adopts the special loosening prevention measures of our company, which makes the operation of circuit breaker more reliable.
Spring operating mechanism with small work, light weight and low noise is adopted, which has no leakage and high reliability.
Important parts of the mechanism are forged with high quality alloy steel, which has high strength and wear resistance. It can ensure frequent operation of circuit breakers and low failure rate.
Secondary circuit electrical components and SF6 density controller adopt high quality products.
The product has novel and bright appearance and compact structure. Installation chassis is made of thick steel plate, hot dip galvanizing process is adopted on the surface, high strength galvanized bolts are used for exposed fasteners, high strength aluminium or stainless steel profiles are used for inter-phase transmission connecting rods, and stainless steel body is made of stainless steel. The corrosion resistance of the product is excellent.
It can be used in three-phase neutral grounding or neutral ungrounded AC system.
Circuit breaker adopts three-pole ceramic bottle pillar structure, three poles are equipped with a spring operating mechanism, central arrangement and three poles are connected. The principle of self-energy arc extinguishing is adopted and the optimal design is carried out in the motion system of circuit breaker. Therefore, the mechanical efficiency is effectively improved and the operation force is reduced to the maximum extent.
The cross beam and base of circuit breaker are bent with 8 mm thick steel plate and galvanized, and the mechanism box is made of 2 mm thick stainless steel plate.
The ceramic sleeve and supporting ceramic sleeve of arc extinguishing chamber are made of high-quality and high-strength porcelain with high strength and good tightness.
The shell of the boom box is made of high strength and high air tightness aluminium alloy. A positioning hole is designed on the shell, which can fix the pole in the braking position conveniently. Clear position indication sign, larger position indication, through mechanical connection, action position is extremely reliable.
ISF6 density controller (with pressure gauge) monitors the density of SF6 gas in circuit breaker and sends out control signal, which has the function of temperature compensation. When the pressure of SF6 gas changes due to the change of ambient temperature, the indicator value of the controller remains unchanged. Only when SF6 gas leakage causes the change of gas density, the controller will send out alarm and locking signals.
The spring operating mechanism has the characteristics of strong interrupting ability, low operation power and high reliability.
The control cabinet is connected to the base by 6 M20 bolts. There are damp-proof and waterproof devices at the connection between the output shaft of the mechanism and the B-phase arm and the outlet of the secondary line. On the inner panel of the control cabinet, there are manual switch-on buttons, remote-local switch, energy storage motor switch and circuit breaker status indicator.
Suitable for high altitude environment (2500m).
It can be operated at - 45 C.
V. Main Technical ParametersVI. Integral Structural Surface of Circuit Breaker (Front) Installation of Foundation
