Special transformers have a long service life， low maintenance costs， and are developed on the basis of traditional air conditioning technology. The process technology is mature， the performance is stable， the operation is safe and reliable， fully automatic without manual operation， and intelligent. 1The working principle of a transformer is to wrap one or three pairs of coils (single-phase or three-phase) around a closed iron core. The coil connected to the power supply is called the primary coil， and the coil connected to the load is called the secondary coil. When the primary coil is connected to an AC power source， current flows through the primary coil， generating alternating magnetic flux&Phe; in the closed iron core;， This alternating magnetic fluxΠ Simultaneously passing through both the primary and secondary coils， according to the principle of electromagnetic induction， and the secondary coil will generate mutual induced electromotive force. At this time， a light bulb will be connected to the secondary coil， and the light will emit light， causing current to flow through the circuit. wInner MongoliaDue to the nonlinearity of the converter， harmonic voltage and current will occur in both AC and DC systems. For converter transformers， the main characteristic harmonic current that flows through is p * n+ harmonic current (p is the number of pulses， n is any positive integer). During operation， harmonic currents can cause increased losses and temperature rise in the converter transformer， resulting in local overheating and high-frequency noise. They can also cause overheating of generators and capacitors in the AC power grid， which can interfere with communication equipment. These harmonic currents should be taken into consideration to avoid affecting the protective device. Precautions for using water and electricity to extinguish fires: When using water and electricity to extinguish fires， regardless of the measures taken， the general small safety distance should be maintained at ≮ m; Firefighters should not touch any parts of their bodies with the water column of direct current directed towards charged bodies to prevent leakage current from entering the ground; Without wearing protective gear， one should not approach the burning area to prevent electrical hazards caused by water stains on the ground; If a wire breakage occurs， a warning area with a radius of meters from the wire landing point should be set up on the ground to prevent electric shock accidents， and the power department should be notified to handle it quickly; When extinguishing a transformer fire， the transformer can operate for a long time without exceeding the output power of the specified temperature rise. LgThe extinguishing of a fire in a live transformer is the same as extinguishing it after a power outage. With the advent of modern civilization， the popularization of electricity has penetrated into thousands of households and is widely used in various fields of society. With the development of production and science and technology， the requirements for electrical fire prevention are becoming increasingly high. Every year， there are countless cases of fires caused by electrical hazards， resulting in serious economic losses and casualties for the country and the people， which is shocking.
Transformer principle sOil level gauge: reflects the oil level status of the transformer， usually around+O. If it is too high， oil should be drained， and if it is too low， oil should be added; In winter， when the temperature is low and the load is light， the oil level does not change much， or the oil level slightly decreases; In summer when the load is heavy， and their conductivity varies with impurities. When using water with high water resistance for live fire extinguishing the oil temperature rises and the oil level also slightly increases; Both are normal. HFactors affecting the magnitude of water leakage current: The influence of water quality resistivity: Different media have different resistivities， the resistance of the water column is high， and the leakage current through the water column is small， which can improve the safety level. The use of chemically pure water is non-conductive， but it is impossible in reality. AanalysisSo the temperature rise of transformers is mainly caused by iron loss and copper loss. Due to the presence of iron and copper losses in transformers， their output power is always less than their input power， resulting in higher efficiency; Representing the relationship between output power and input power:& eta;= Output power/input power. hRAutotransformer: used to connect power systems of different voltages. It can also be used as a regular step-up or step-down transformer. The oil pipe from the transformer body to the oil pillow should have a rising slope of % to % along the direction of the gas relay. But the gas relay should be kept in a horizontal position.
In order to prevent similar situations from happening again， and annual basis. Once it is found that the fuse used in operation does not match the capacity of the operating rural transformer， the responsible rural electrician should be severely punished and not lightly spared. Meticulous workmanshipdAn insulation system that combines H-grade insulation materials with high ignition point oil. MIf one of the following situations occurs， it is advisable to choose a transformer with wiring group D， Yn type: If an animal is connected across the low-voltage bushing of a transformer， it may cause a short circuit and catch fire. qInner MongoliaThe working principle of a transformer is to wrap one or three pairs of coils (single-phase or three-phase) around a closed iron core. The coil connected to the power supply is called the primary coil， and the coil connected to the load is called the secondary coil. When the primary coil is connected to an AC power source， current flows through the primary coil， generating alternating magnetic flux&Phe; in the closed iron core;， This alternating magnetic fluxΠ Simultaneously passing through both the primary and secondary coils according to the principle of electromagnetic induction， the primary coil will generate self induced electromotive force， and the secondary coil will generate mutual induced electromotive force. At this time， a light bulb will be connected to the secondary coil， and the light will emit light， causing current to flow through the circuit. oNPower transformers are an important part of the power supply system. It can be said that wherever there are people， there is electricity; Wherever there is electricity， there is a transformer. In order to enhance insulation performance， most substations use insulating materials such as oil paper. If these insulating materials encounter sparks and arcs they will not only burn themselves， but also cause regional power outages and fire accidents， which brings great inconvenience to peoples normal work， life， and production. Moreover， when a transformer catches fire， the combustion spreads rapidly and it is difficult to extinguish. The inspection cycle of gas protection is carried out in conjunction with the overhaul of transformers. - external inspections， insulation tests， and whole group inspections should be conducted annually. Inspect the internal and mechanical parts of the gas relay of the operating transformer every - years.
