CN110940935A - Transformer short circuit detection system and detection method - Google Patents
Transformer short circuit detection system and detection method Download PDFInfo
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- CN110940935A CN110940935A CN201911284899.3A CN201911284899A CN110940935A CN 110940935 A CN110940935 A CN 110940935A CN 201911284899 A CN201911284899 A CN 201911284899A CN 110940935 A CN110940935 A CN 110940935A
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Abstract
The invention discloses a transformer short circuit detection system which comprises an inductance detection unit, a microcontroller and a short circuit protection unit, wherein the inductance detection unit is connected with the microcontroller, the microcontroller is connected with the short circuit protection unit, and the inductance detection unit consists of a multimeter and a calculation unit. The invention also discloses a detection method of the transformer short-circuit detection system, the inductance detection unit is adopted to measure the inductance of the coil in the transformer in real time and transmit the inductance to the microcontroller, when the inductance in the coil is instantaneously and greatly reduced, the microcontroller judges that the transformer has a short-circuit fault, and drives the short-circuit protection unit to carry out short-circuit protection on the transformer.
Description
Technical Field
The invention belongs to the technical field of electronic equipment detection, and relates to a transformer short circuit detection system and a detection method.
Background
A Transformer (Transformer) is a device that changes an alternating-current voltage by using the principle of electromagnetic induction, and main components are a primary coil, a secondary coil, and an iron core (magnetic core). The main functions are voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization (magnetic saturation transformer) and the like. The transformer can be divided into a power transformer and a special transformer (an electric furnace transformer, a rectification transformer, a power frequency test transformer, a voltage regulator, a mining transformer, an audio transformer, a medium-frequency transformer, a high-frequency transformer, an impact transformer, an instrument transformer, an electronic transformer, a reactor, a mutual inductor and the like) according to the application.
With the continuous healthy and high-speed development of Chinese economy, the demand of electric power is continuously and rapidly increased. The rapid development of Chinese power construction drives the development of the manufacturing industry of Chinese transformers. In 2011, the output of the national transformer reaches 14.3 hundred million kilovolt-ampere, and the yield is increased by 6.86 percent on a same scale. In 2011, 1461 enterprises with more than large scale (more than 2000 RMB business income) in the manufacturing industry of the Chinese transformer exist; the sale amount is 2901.40 million yuan, the total profit amount is 166.08 million yuan, the asset scale is 2638.40 million yuan, and the product sale profit is 339.72 million yuan.
The Chinese transformer industry has fierce competition, foreign countries and companies seize a large market share, and the number of domestic transformer manufacturing enterprises is also rapidly increased. For example, the Shandong permanent transformer has strong market competition of middle and low-end transformers, and more than 20 families exist for enterprises with the production capacity of 220KV transformers and more than 100 families exist for enterprises with the production capacity of 110KV transformer products. And enterprises producing transformers of more than 500KV level construct very high entry barriers through technology and productivity, and the market pattern tends to be stable.
Among the transformer failures, the influence caused by the short circuit of the transformer is the most serious. If the transformer is short-circuited, the impedance of the coil disappears, the output voltage is 0, the voltage of the primary coil is zero, the excitation inductance voltage is zero due to the fact that the excitation inductance and the ideal transformer are in parallel connection, the excitation inductance of volt-second is lost, the magnetic core cannot be magnetized any more, the excitation inductance disappears, the excitation magnetic flux disappears, the primary coil becomes a different line, the primary voltage is completely added to the leakage inductance, the current is increased rapidly, and short-circuit current appears. Once the secondary side is short-circuited, the primary side is reflected and short-circuited, the voltage relation ratio disappears, the short-circuit current tends to be infinite, and the transformer can be burnt.
Disclosure of Invention
The invention aims to provide a transformer short circuit detection system which can detect whether a transformer is short-circuited in real time and avoid burning the transformer.
Another object of the present invention is to provide a detection method of a transformer short circuit detection system.
The invention adopts a first technical scheme that the transformer short-circuit detection system comprises an inductance detection unit, a microcontroller and a short-circuit protection unit, wherein the inductance detection unit is connected with the microcontroller, and the microcontroller is connected with the short-circuit protection unit.
The present invention is also technically characterized in that,
the inductance detection unit consists of a multimeter and a calculation unit.
According to the second technical scheme, the inductance detection unit is adopted to measure the inductance of the coil in the transformer in real time and transmit the inductance to the microcontroller, and when the inductance in the coil is reduced instantly and greatly, the microcontroller judges that the transformer has a short-circuit fault and drives the short-circuit protection unit to carry out short-circuit protection on the transformer.
The inductance detection unit consists of a multimeter and a calculation unit.
Measuring coil inductance L in a transformer by using a universal meter, comprising a direct current resistance R for measuring a coil by using the universal meter, introducing commercial power into the coil of the transformer, measuring current I in the coil by using the universal meter, and measuring the current I in the coil by using the universal meter, wherein I is U/ZGeneral assemblyThe total impedance Z in the coil can be calculatedGeneral assemblyF represents the frequency of the alternating current in the coil, according to the formula Z2 General assembly＝R2+(2πfL)2The coil inductance L in the transformer can be calculated.
The invention has the advantages that the inductance detection unit is connected to the coil of the transformer, the inductance of the coil in the transformer is measured in real time by the inductance detection unit and is transmitted to the microcontroller, when the inductance in the coil is instantaneously and greatly reduced, the microcontroller judges that the transformer has a short-circuit fault, the short-circuit protection unit is driven to carry out short-circuit protection on the transformer, and the burning-out event of the transformer due to short circuit is avoided.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention discloses a transformer short circuit detection system which comprises an inductance detection unit, a microcontroller and a short circuit protection unit, wherein the inductance detection unit is connected with the microcontroller, and the microcontroller is connected with the short circuit protection unit.
The inductance detection unit consists of a multimeter and a calculation unit.
The microcontroller is a single-chip microcomputer in which the main part of the microcomputer is integrated on one chip. The microcontroller generally takes a certain microprocessor core as a core, and various necessary functions and peripheral devices such as R0M/EPRRM, RAM, bus logic, timing/counter, Watchdog, I/O, serial port, pulse width modulation output, A/D, D/A, Flash, RAM, EEPROM and the like are integrated in the chip.
The microcontroller is capable of controlling and coordinating the actions of the entire device, requiring a Program Counter (PC), an Instruction Register (IR), an Instruction Decoder (ID), timing and control circuitry, as well as pulse sources, interrupts, etc.
The invention relates to a transformer short-circuit detection method, which comprises the steps of connecting an inductance detection unit to a coil of a transformer, measuring the inductance of the coil in the transformer in real time by using the inductance detection unit, transmitting the inductance to a microcontroller, judging that the transformer has a short-circuit fault by using the microcontroller when the inductance in the coil is instantaneously and greatly reduced, and driving a short-circuit protection unit to carry out short-circuit protection on the transformer.
The short-circuit protection unit is a device which is connected in a circuit and plays a role in protecting the short-circuit fault of the circuit in the circuit.
The inductance detection unit consists of a multimeter and a calculation unit.
The universal meter is an indispensable measuring instrument for power and electronics departments and is divided into a pointer universal meter and a digital universal meter according to a display mode. The universal meter is a multifunctional and multi-range measuring instrument, and can be used for measuring direct current, direct voltage, alternating current, alternating voltage, resistance, audio level and the like, and some parameters of alternating current, capacitance, inductance, semiconductors and the like.
Measuring coil inductance L in a transformer by using a universal meter, comprising a direct current resistance R for measuring a coil by using the universal meter, introducing commercial power into the coil of the transformer, measuring current I in the coil by using the universal meter, and measuring the current I in the coil by using the universal meter, wherein I is U/ZGeneral assemblyThe total impedance Z in the coil can be calculatedGeneral assemblyF represents the frequency of the alternating current in the coil, according to the formula Z2 General assembly＝R2+(2πfL)2The coil inductance L in the transformer can be calculated.
The inductance value can also be measured by connecting a resistor, a capacitor and an inductor to be detected in series to form an RLC circuit; controlling the waveform generator to generate a frequency f by using the controller0And will have a frequency f0The alternating current signal of (2) is applied to the circuit; wherein, the frequency f0Causing the RLC circuit to resonate; detecting the current of the RLC circuit by using a current sensor, and detecting the detected current I0Sending the voltage to a controller, detecting the voltage of the RLC circuit by adopting a voltage sensor, and sending the detected voltage U0 to the controller; calculating by using a controller to obtain a loss resistance RL of the inductor to be detected; and calculating the quality factor of the inductor to be detected by adopting a controller, wherein the frequency fj is the working frequency of the inductor to be detected under the alternating voltage.
The controller is adopted to control the waveform generator to generate sinusoidal signals with different frequencies and the frequency of fi, and the sinusoidal signals with the frequency of fi are applied to the RL circuit; detecting the current of the circuit by adopting a current sensor, sending the detected current Ii to a controller, detecting the voltage at two ends of an inductor to be detected in the circuit by adopting a voltage sensor, and sending the detected voltage Ui to the controller; and calculating the inductance Li of the to-be-detected inductors of the fi under different frequencies by adopting a controller, and performing average calculation on the obtained inductance Li of the plurality of to-be-detected inductors to obtain the inductance L of the to-be-detected inductors.
Claims (5)
1. The transformer short circuit detection system is characterized by comprising an inductance detection unit, a microcontroller and a short circuit protection unit, wherein the inductance detection unit is connected with the microcontroller, and the microcontroller is connected with the short circuit protection unit.
2. The transformer short circuit detection system according to claim 1, wherein the inductance detection unit comprises a multimeter and a computing unit.
3. The transformer short-circuit detection method is characterized in that an inductance detection unit is adopted to measure inductance of a coil in a transformer in real time and transmit the inductance to a microcontroller, when the inductance in the coil is instantaneously and greatly reduced, the microcontroller judges that the transformer has a short-circuit fault, and drives a short-circuit protection unit to carry out short-circuit protection on the transformer.
4. The transformer short circuit detection method according to claim 3, wherein the inductance detection unit comprises a multimeter and a computing unit.
5. The method according to claim 4, wherein the step of measuring the inductance L of the coil in the transformer by using the multimeter comprises the steps of measuring the direct current resistance R of the coil by using the multimeter, introducing commercial power into the coil of the transformer, measuring the current I in the coil by using the multimeter, and measuring the current I by using the value of I-U/ZGeneral assemblyThe total impedance Z in the coil can be calculatedGeneral assemblyF represents the frequency of the alternating current in the coil, according to the formula Z2 General assembly＝R2+(2πfL)2The coil inductance L in the transformer can be calculated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911284899.3A CN110940935A (en) | 2019-12-13 | 2019-12-13 | Transformer short circuit detection system and detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911284899.3A CN110940935A (en) | 2019-12-13 | 2019-12-13 | Transformer short circuit detection system and detection method |
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| CN110940935A true CN110940935A (en) | 2020-03-31 |
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| CN201911284899.3A Pending CN110940935A (en) | 2019-12-13 | 2019-12-13 | Transformer short circuit detection system and detection method |
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Citations (8)
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| US20110242989A1 (en) * | 2008-10-31 | 2011-10-06 | Kim Charles J | System And Method Of Detecting And Locating Intermittent And Other Faults |
| CN202872336U (en) * | 2012-10-26 | 2013-04-10 | 河南起重机器有限公司 | Protective line for transformer short circuit detection |
| CN204374351U (en) * | 2015-01-29 | 2015-06-03 | 国家电网公司 | A kind of Transformer Winding short-circuit detecting circuit |
| CN105203906A (en) * | 2015-09-21 | 2015-12-30 | 吴建堂 | Coil interturn short-circuit tester |
| CN205157707U (en) * | 2015-11-19 | 2016-04-13 | 江苏东冉升电子科技有限公司 | Winding short -circuit test appearance circuit |
| CN107271837A (en) * | 2017-08-10 | 2017-10-20 | 苏州星阁星诚机电工程有限公司 | A kind of coil turn-to-turn short circuit test device |
| CN206920524U (en) * | 2017-05-31 | 2018-01-23 | 许继电气股份有限公司 | A kind of modified incremental impedance method measurement apparatus of inverter filtering iron inductance |
| CN108008243A (en) * | 2017-12-20 | 2018-05-08 | 郑州舒柯科技有限公司 | A kind of machine winding short-circuit tester |
-
2019
- 2019-12-13 CN CN201911284899.3A patent/CN110940935A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110242989A1 (en) * | 2008-10-31 | 2011-10-06 | Kim Charles J | System And Method Of Detecting And Locating Intermittent And Other Faults |
| CN202872336U (en) * | 2012-10-26 | 2013-04-10 | 河南起重机器有限公司 | Protective line for transformer short circuit detection |
| CN204374351U (en) * | 2015-01-29 | 2015-06-03 | 国家电网公司 | A kind of Transformer Winding short-circuit detecting circuit |
| CN105203906A (en) * | 2015-09-21 | 2015-12-30 | 吴建堂 | Coil interturn short-circuit tester |
| CN205157707U (en) * | 2015-11-19 | 2016-04-13 | 江苏东冉升电子科技有限公司 | Winding short -circuit test appearance circuit |
| CN206920524U (en) * | 2017-05-31 | 2018-01-23 | 许继电气股份有限公司 | A kind of modified incremental impedance method measurement apparatus of inverter filtering iron inductance |
| CN107271837A (en) * | 2017-08-10 | 2017-10-20 | 苏州星阁星诚机电工程有限公司 | A kind of coil turn-to-turn short circuit test device |
| CN108008243A (en) * | 2017-12-20 | 2018-05-08 | 郑州舒柯科技有限公司 | A kind of machine winding short-circuit tester |
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