Overtemperature alarm and trip: collect winding or iron core temperature data signals according to the temperature measurement resistor of PTC discrete system thermistor embedded in the bottom voltage winding. When the transformer winding temperature rises again， the system software outputs the overtemperature alarm system; If the temperature rises to ℃ again and the transformer can no longer operate， the overtemperature trip data signal must be transported to the secondary maintenance circuit， and the transformer shall be tripped quickly.
2How to select dry-type transformer
eEsperantoHow much is the power transformer
The transformer manufacturer said that the selection should be based on the application environment of the dry-type transformer. For the extremely extreme environment， the dry-type transformer should be poured with epoxy resin glue. Because this kind of environment does not need to heat the dry-type transformer， it can operate immediately. However，Products Show for the general application environment，CheeseScb13-1250kva dry type transformerIndustry specific operations the class H dry-type transformer can be used.
LKikamiIn fact， apart from the application of the Finance Bureau， so as to promote the improvement of energy consumption level of transformer commodities.
LoFirst of all， although dry-type transformer has strong moisture resistance， it is generally open structure or very susceptible to moisture， especially the insulation level of dry-type transformer manufactured in China is low (lower flame retardant grade) Therefore， the dry-type transformer can obtain high stability only when the air humidity is below %. The dry-type transformer shall also be prevented from stopping operation for a long time to prevent serious damp. When the grounding resistance value is less than / V (operating voltage)， it indicates that the transformer is seriously damp， and the trial operation shall be terminated.
The grounding resistance of，Products Show high voltage and bottom voltage shall not be less than % (m & omega;) of the original value. The difference between the three-phase mean value of winding resistance measurement at the same temperature shall not exceed %， which shall not exceed % compared with the last accurate measurement result.
The transformer manufacturer said that the temperature display equipment: the temperature change value is measured according to the PT temperature sensor embedded in the bottom voltage winding to immediately indicate the winding temperature of each phase (three-phase safety inspection and Zui large value indication， and the historical time Zui high temperature can be recorded). The Zui high temperature can be input and output as mA analog quantity. If it is to be transmitted to a distance (the distance can reach m， the electronic computer can be equipped with an electronic computer socket， an intelligent transmitter， and transformers can be detected. The over temperature alarm and trip of the system software can also be signaled by the resistor data of Pt thermistor sensor， so as to further improve the stability of the temperature maintenance system software.
bkV and above & plusmn; No load of rated voltage; Part of the circuit breaker of the tap power switch is installed in the phenolic resin insulating paper cylinder， and the insulating paper cylinder is installed on the wooden frame. The actual operation rocker is connected with the dynamic circuit breaker of the tap power switch according to the wooden insulating rod. The on load tap off power switch is insulated from the ground by the insulating paper cylinder of the power switch itself and the insulating limit.
KMany people probably dont know much about the power distribution transformer manufacturers. In fact， the transformer can be plugged in for trial operation after careful inspection before capital investment. During the trial operation period， you must pay attention to the following points. Whether there is abnormal sound，Products Show noise and vibration， whether there is abnormal smell such as coke smell and whether there is discoloration caused by partial overheating. Ventilation is good. In addition，CheeseScb13-1250kva dry type transformerIndustry specific operations we should also pay attention to the following aspects.
SwholesalerThere is a magnetic induction line crossing in the transformer core， which will cause induced electromotive force on the plan perpendicular to the magnetic induction line. Because this electric flow creates a closed loop to generate an electric field and forms a vortex， it is called vortex. The existence of vortex makes the transformer core hot and consumes kinetic energy. This kind of loss is called vortex loss.
xEThe transformer manufacturer said that the selection should be based on the application environment of the dry-type transformer. For the extremely extreme environment， the dry-type transformer should be poured with epoxy resin glue. Because this kind of environment does not need to heat the dry-type transformer， it can operate immediately. However， for the general application environment， the class H dry-type transformer can be used.
It should be said that after the development trend of these years， the overall level of Chinas transformer industry at this stage is basically international，Power transformer price: 1000KVA, 33kV, 25kV, power transformer, oil immersed transformer, dry-type transformer factory and the quality level is no different from that of overseas goods& rdquo; The person in charge of the transformer Federation of China Household Appliance Industry Association said.
Transformer manufacturers said that at this stage， the energy-saving distribution transformer Market in China is relatively scattered， coupled with the constraints of factors such as low threshold in the field uneven companies， and inadequate technical innovation lack of evaluation and specifications， resulting in the slow marketing and promotion of energy-saving transformers.
Sampling inspectionlTransformer inspection nose sniffing method
YWhen sampling in bulk gasoline barrels， samples shall be selected according to % of the number of gasoline barrels， but not less than barrels. When sampling in batches of small and medium-sized pails or bottles， samples shall be taken according to % of the total number of barrels (bottles).
The grounding resistance of， high voltage and bottom voltage shall not be less than % (m & omega;) of the original value. The difference between the three-phase mean value of winding resistance measurement at the same temperature shall not exceed %， which shall not exceed % compared with the last accurate measurement result.
vEsperantoAccording to statistics， to occupy the main global technical position， the transformer industry depends on two key data， commodity volume and voltage level. As early as & ldquo; Eleventh Five Year Plan; In the early stage， China has been a powerful country in the production， manufacturing and application of dry-type transformers all over the world， the ratio of output power to input power of transformer is called the efficiency of transformer， i.e. & ETA; Is the efficiency of the transformer; P is the input power and P is the output power.