Epoxy resin casting insulation dry-type distributi

Epoxy resin casting insulation dry-type distribution transformerSeries SC (B) 9, Grade 22KV Three-phase, 50 2500KVA dry-type distribution transformerProduct standard GB1094.11-2008(instead of GB6450-1986), GB/T10228-2008(instead of GB/T10228-1997), IEC60076-1993Rated high voltage:20 (20,24)kV High voltage tapping range: ±5% or ±2×2.5% Rated low voltage: 0.4kV, 0.415kv, 0.433kv Connection symbol: Dyn11,Yyn0 Insulation level: LI125AC50/LI0AC3 Main feature Advanced and reasonable structure, small volume, light weight, convenient installation, maintenance-free and good economy.Low noise and loss, good heat dissipation performance, strong loading abilityGood moisture proof performance, it can run with 95% relative Humidity. Low value of partial discharge, can guarantee long term safety operation in working voltage. It can increase 40 50% of rated capacity shortly in forced air cooling. Good insulation performance, high tolerance for lightning Impulse level, and strong ability to bear sudden short circuit. It is high mechanical strength and good thermal stability. Because of rational combination for insulation material, it can obtain the same temperature expansion coefficient with copper conductor. The computer temperature controller automatic monitoring and protection provides reliable safeguard for transformers safety operation. It is strong ability of flame retardant and automatic flameout. It can install in load center. Product application scope: High-Rise Building, Commercial center, City square, Hospital, School, Airport, Station, Seaport, Underground, Power station, Oilfield, Chemical Industry, Tunnel and so on. Temperature control protection system for dry-type transformer It will make transformer too thermal under high temperature environment, improper cooling, and over loading. In order to improve operation safety reliability, it can install BWD-3K computer control system. It checks winding temperature of dry-type power transformer using three platinum resistances of three-phase winding in dry-type power transformer. It also has feature of temperature automatic control and cooling fan start-stop. Overheating alarm and overheating tripping can guarantee dry-type power transformer safety operation. Fan will start if temperature reached 100oC, and then will stop if temperature reached 80oC. Overheating alarm will start if temperature reached 130oC and will trip if reached 150oC.Feature for computer temperature control BWD-3K Monitoring protection, it can judge short circuit for sensor and stuck-open fault effectively. When sensor was broken and temperature controller can not check the temperature, fan will be forced to start in order to guarantee transformer safety operation. Meanwhile, temperature controller will issue sound and light alarm, also get through remote alarm in order to treat in time. Overheating alarm, when there is one of three-phase winding reach set overtemperature alarm, temperature controller will issue sound and light alarm, also get through remote alarm in order to treat in time. Automatic tripping protection, when there is one of three-phase winding reaches set tripping temperature, temperature controller will get through output terminal (usually, two terminals is break, and is connected when get through.), in order to provide a signal to remote control cabinet and start tripping circuit. Fan monitoring and protection, it is to avoid fan corrosion and locked-rotor because of long-term non-using. One of the features for temperature controller is timing start fan. Also, the bottom in temperature controller can start up fan in order to examine fan feature. Meanwhile, temperature controller has feature of black box, it can record temperature of three windings and machine working state before power failure. In order to avoid the other people to change setting, there is password with temperature controller.Dry-type transformer forced air cooling systemThe cooling method for dry-type transformer is natural air cooling and forced air cooling. In Natural air cooling, dry-type transformer will be continue to output 100% rated capacity in normal condition. With all loading period, it limits max output power of transformer. So that it can increase 40 50% rated capacity output shortly for the forced air cooling system transformer. Cooling fan start and stop depends on the temperature of winding. Temperature controller will start up fan automatically and force cooling to transformer if temperature is higher than set started temperature. Cool wind blow to high and low pressure coil of transformer in order to cool airway. There is obvious heat dissipation effect, in order to guarantee normal operation and extend using period for dry-type transformer.