Short-circuit/overload protection circuit for single-phase transformers
An overload protection circuit and single-phase transformer technology, applied in the field of transformers, can solve the problems of high cost and complex protection circuit, and achieve the effect of simple circuit and damage prevention.
Active Publication Date: 2018-03-06
国网黑龙江省电力有限公司管理培训中心 +1
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Problems solved by technology
[0003] The purpose of the present invention is to solve the problem of complex protection circuit, high cost and no clear fault display signal in the protection circuit of single-phase transformer in power plant, and provides a short circuit / overload protection circuit of single-phase transformer
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specific Embodiment approach 1
[0017] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the short-circuit / overload protection circuit of the single-phase transformer described in this embodiment, which includes BRT22 optically coupled three-terminal controllable switch, TCA105 threshold switch, NE555 time base integrated circuit, NPN transistor VT1, NPN transistor VT2, resistor R1, resistor R2, resistor R3, resistor R4, sliding rheostat Rp, thermistor RT, capacitor C1, capacitor C2, capacitor C3, electrolytic capacitor C4, diode D1, diode D2, NOT gate G1, NOT gate G2, fault indicator light LED and horn BL;
[0018] One end of the 220V AC power supply is connected to one end of the primary coil of the single-phase transformer T, and the other end of the 220V AC power supply is connected to one end of the thermistor RT and pin 6 of the BRT22 optically coupled three-terminal controllable switch; the other end of the thermistor RT Connect the other end of the primar...
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The short-circuit / overload protection circuit of a single-phase transformer belongs to the field of transformers. The invention solves the problems of complex protection circuit, high cost and no clear fault display signal for the protection circuit of single-phase transformer in power plants. The invention includes BRT22 optically coupled three-terminal controllable switch, TCA105 threshold switch, NE555 time base integrated circuit, transistors VT1, VT2, resistors R1-R4, sliding rheostat Rp, thermistor RT, capacitors C1-C4, diode D1, diode D2, NOT gate G1, G2, fault indicator LED and horn BL; if the secondary circuit is overloaded or short-circuit fault, BRT22 will be turned off. At this time, the increased current passes through the thermistor RT, causing it to heat up quickly, resulting in a higher resistance value and blocking the primary circuit, thereby protecting the transformer T from being burned out due to overload or short circuit.
Description
technical field [0001] The invention relates to a protection circuit of a transformer, which belongs to the field of transformers. Background technique [0002] A transformer is a static element that converts one level of AC power into another level of AC power of the same frequency. Power transformers are one of the important equipment in power plants and substations. They are used for power transmission and distribution in power systems. Transformers play an important role in power operation. If the transformer coil or load is short-circuited, the transformer will withstand a considerable short-circuit current. If the protection system fails or the protection setting is too large, the transformer may be burned. For this reason, a reliable short-circuit protection device must be installed. For the protection circuit of the single-phase transformer in the power plant, there are problems that the protection circuit is complicated, the cost is high, and there is no clear fau...
Claims
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IPC IPC(8): H02H7/04
Inventor 姜德胜张歆炜李东辉孙国强杨艳秋
Owner 国网黑龙江省电力有限公司管理培训中心