CN103840675A - Low-frequency heating device of transformer - Google Patents
Low-frequency heating device of transformer Download PDFInfo
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- CN103840675A CN103840675A CN201410068619.6A CN201410068619A CN103840675A CN 103840675 A CN103840675 A CN 103840675A CN 201410068619 A CN201410068619 A CN 201410068619A CN 103840675 A CN103840675 A CN 103840675A
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Abstract
The invention discloses a low-frequency heating device of a transformer. The low-frequency heating device comprises a three-phase power supply, a thyristor alternating current alternating current variable frequency rectification unit, a trigger controller, a harmonic reactive compensator, a measuring unit, a temperature measurement unit and a control box, wherein the input end of the three-phase power supply is connected with the harmonic reactive compensator which is connected with the thyristor alternating current alternating current variable frequency rectification unit, the thyristor alternating current alternating current variable frequency rectification unit outputs sine-wave or square-wave voltage and current signals to the measuring unit and a load, the measuring unit is used for measuring corresponding effective values and waveforms, the effective values and waveforms are transmitted to the control box to be used for display and feedback calculation, the load is connected with the temperature measurement unit, the temperature measurement unit transmits corresponding measuring information to the control box for display and temperature control, and the trigger controller outputs reversing signals generated by output frequency and correspondingly precise to the thyristor alternating current alternating current variable frequency rectification unit according to needs. Inductive reactance of the transformer can be reduced through adjustment of frequency of output voltage, and low-magnitude alternating voltage is added to windings of the transformer so that rated currents needed for heating can be obtained.
Description
Technical field
The present invention relates to field, particularly relate to a kind of transformer low frequency heater.
Background technology
When transformer adopting short-circuit method is insulated to heat drying processing, relating to an important parameter, is exactly the short-circuit impedance of heated transformer.As everyone knows, short-circuit impedance comprises resistive component (be resistance, corresponding meritorious consume) and perceptual weight (being reactance, corresponding perceptual reactive power consumption) two parts, and perceptual weight is corresponding with leakage inductance, on numerical value, is directly proportional to the frequency of applied experiment power supply.
Under traditional industrial frequency experiment condition, the perceptual weight in Transformer Short Circuit Impedance is much larger than resistive component (perception by force).Because heating effect or caloric value only depend on meritorious consumption, for transformer is heated, the perception that often needs to provide a large amount of is idle, and test power factor is very low.This mean that the capacitor that need to provide a large amount of carries out reactive power compensation, to reduce the demand to test power supply capacity.Meanwhile, because short-circuit impedance under power frequency is higher, for reaching certain heating current, conventionally need to provide higher test voltage (can reach tens of to up to a hundred kilovolts).For this reason, generally, need the middle step-up transformer of larger capacity that supply voltage is improved.
Summary of the invention
The technical problem that the present invention mainly solves is to provide a kind of transformer low frequency heater, can pass through the frequency of regulation output voltage, reduce the induction reactance of transformer, made to add the alternating voltage compared with low amplitude value at the winding of transformer, can reach the required rated current of heating.Greatly reduced the volume and weight of heater, on-the-spot only needs simply assembles and wiring, can carry out fast test, thereby improve greatly operating efficiency, also reduced use cost, and the requirement in place is also correspondingly reduced.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of transformer low frequency heater is provided, comprise three phase mains, comprise thyristor AC-AC frequency rectification unit, trigger controller, harmonic reactive-load compensation device, measuring unit, temperature measuring unit and control cabinet, described three phase mains input connects harmonic reactive-load compensation device, harmonic reactive-load compensation device connects thyristor AC-AC frequency rectification unit, thyristor AC-AC frequency rectification unit output sine or square-wave voltage electric current wire size are to measuring unit and load, corresponding effective value and waveform measurement unit are measured in measuring unit output, and be sent to control cabinet for showing and feedback calculating, load connects temperature measuring unit, temperature measuring unit is sent to control cabinet for showing and temperature control by corresponding metrical information, the correspondence that trigger controller produces according to required output frequency is exported commutation signal accurately to thyristor AC-AC frequency rectification unit.
Preferably, described thyristor AC-AC frequency rectification unit is to be made up of the three-phase full-controlled rectifier bridge of two groups of full controls, these two groups of positive and negative reverse parallel connections of full-controlled rectifier bridge, composition AC/AC (alternating current) variable-frequency rectification unit, three-phase input power accesses this rectification unit, through over commutation and alternately sine wave output or square-wave voltage electric current wire size after commutation.
Preferably, described for controlling the trigger controller of rectification unit triggering and conducting, produce the high-resolution conducting triggering signal of ultralow frequency, corresponding thyristor is opened in timing, and the correspondence producing according to required output frequency is exported commutation signal accurately.
Preferably, described produces harmonic wave and idle harmonic reactive-load compensation device for administering input power, fixing harmonic wave and reactive power that this compensator compensates is produced at power supply input side when the rectification by rectification unit, improve the load capacity of mains side, reduces the wave distortion of input power.
Preferably, described for measuring the measuring unit of frequency conversion rectifier unit output voltage current effective value and waveform, this low frequency heater produces ultra-low frequency alternating voltage electric current for heating, the size of output voltage current amplitude is measured by corresponding effective value and waveform measurement unit, and is sent to control cabinet for showing and feedback calculating.
Preferably, described is the temperature measuring unit of transformer temperature rise for measuring heated object, will monitor temperature and the temperature rise situation of heated transformer in heating process the moment, and corresponding metrical information is sent to control cabinet for showing and temperature control.
Preferably, the described control cabinet for remote interaction control and calculating, receive the voltage and current measurement information transmitting from output voltage current measuring unit, receive heated transformer temperature and temperature information that temperature measuring unit transmits, by calculating, draw the control command of corresponding control output voltage electric current lifting and corresponding FREQUENCY CONTROL instruction, control thyristor trigger controller, control final output voltage current amplitude and frequency.
The invention has the beneficial effects as follows: a kind of transformer low frequency heater of the present invention is can heating effect good.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of transformer low frequency heater of the present invention.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in detail, thereby so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that, protection scope of the present invention is made to more explicit defining.
Refer to Fig. 1, the embodiment of the present invention comprises:
A kind of transformer low frequency heater, comprise three phase mains, comprise thyristor AC-AC frequency rectification unit, trigger controller, harmonic reactive-load compensation device, measuring unit, temperature measuring unit and control cabinet, described three phase mains input input connects harmonic reactive-load compensation device, harmonic reactive-load compensation device connects thyristor AC-AC frequency rectification unit, thyristor AC-AC frequency rectification unit output sine or square-wave voltage electric current wire size are to measuring unit and load, corresponding effective value and waveform measurement unit are measured in measuring unit output, and be sent to control cabinet for showing and feedback calculating, load connects temperature measuring unit, temperature measuring unit is sent to control cabinet for showing and temperature control by corresponding metrical information, the correspondence that trigger controller produces according to required output frequency is exported commutation signal accurately to thyristor AC-AC frequency rectification unit.
Thyristor AC-AC frequency rectification unit is to be made up of the three-phase full-controlled rectifier bridge of two groups of full controls, these two groups of positive and negative reverse parallel connections of full-controlled rectifier bridge, composition AC/AC (alternating current) variable-frequency rectification unit, three-phase input power accesses this rectification unit, through over commutation and alternately sine wave output or square-wave voltage electric current wire size after commutation.
For controlling the trigger controller of rectification unit triggering and conducting, produce the high-resolution conducting triggering signal of ultralow frequency, corresponding thyristor is opened in timing, and the correspondence producing according to required output frequency is exported commutation signal accurately.
Produce harmonic wave and idle harmonic reactive-load compensation device for administering input power, fixing harmonic wave and reactive power that this compensator compensates is produced at power supply input side when the rectification by rectification unit, improve the load capacity of mains side, reduce the wave distortion of input power.
For measuring the measuring unit of frequency conversion rectifier unit output voltage current effective value and waveform, this low frequency heater produces ultra-low frequency alternating voltage electric current for heating, the size of output voltage current amplitude is measured by corresponding effective value and waveform measurement unit, and is sent to control cabinet for showing and feedback calculating.
Be the temperature measuring unit of transformer temperature rise for measuring heated object, in heating process, will monitor temperature and the temperature rise situation of heated transformer the moment, corresponding metrical information is sent to control cabinet for showing and temperature control.
For the control cabinet of remote interaction control and calculating, receive the voltage and current measurement information transmitting from output voltage current measuring unit, receive heated transformer temperature and temperature information that temperature measuring unit transmits, by calculating, draw the control command of corresponding control output voltage electric current lifting and corresponding FREQUENCY CONTROL instruction, control thyristor trigger controller, control final output voltage current amplitude and frequency.
The method of work of this device:, then calculate and open sending the time of pulse by detecting phase place and the zero-crossing timing point of input power by trigger controller, open corresponding rectifying device.Output voltage current unit measuring unit is surveyed actual output voltage current value, delivers to control cabinet show by optical fiber transmission.Temperature measuring unit is measured the temperature rise situation of heated transformer in real time by temperature sensor, deliver to control cabinet show by optical fiber transmission.Control cabinet receives real time temperature value and the temperature rise value of transformer, open sending the time of pulse by regulating trigger controller, regulate the output voltage current value of rectification unit, thereby control heated transformer in temperature allowed range, do not damage under the prerequisite of transformer, heat from transformer is inner quickly and safely, and coordinate heating oil in vacuum circulation, complete the dry processing after transformer is installed.This transformer low frequency heater, by the frequency of regulation output voltage, has reduced the induction reactance of transformer, makes to add the alternating voltage compared with low amplitude value at the winding of transformer, can reach the required rated current of heating.Greatly reduced the volume and weight of heater, on-the-spot only needs simply assembles and wiring, can carry out fast test, thereby improve greatly operating efficiency, also reduced use cost, and the requirement in place is also correspondingly reduced
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (7)
1. a transformer low frequency heater, comprise three phase mains, it is characterized in that: comprise thyristor AC-AC frequency rectification unit, trigger controller, harmonic reactive-load compensation device, measuring unit, temperature measuring unit and control cabinet, described three phase mains input connects harmonic reactive-load compensation device, harmonic reactive-load compensation device connects thyristor AC-AC frequency rectification unit, thyristor AC-AC frequency rectification unit output sine or square-wave voltage electric current wire size are to measuring unit and load, corresponding effective value and waveform measurement unit are measured in measuring unit output, and be sent to control cabinet for showing and feedback calculating, load connects temperature measuring unit, temperature measuring unit is sent to control cabinet for showing and temperature control by corresponding metrical information, the correspondence that trigger controller produces according to required output frequency is exported commutation signal accurately to thyristor AC-AC frequency rectification unit.
2. a kind of transformer low frequency heater according to claim 1, it is characterized in that: described thyristor AC-AC frequency rectification unit is to be made up of the three-phase full-controlled rectifier bridge of two groups of full controls, these two groups of positive and negative reverse parallel connections of full-controlled rectifier bridge, composition AC/AC (alternating current) variable-frequency rectification unit, three-phase input power accesses this rectification unit, through over commutation and alternately sine wave output or square-wave voltage electric current wire size after commutation.
3. transformer low frequency heater according to claim 1, it is characterized in that: described for controlling the trigger controller of rectification unit triggering and conducting, produce the high-resolution conducting triggering signal of ultralow frequency, corresponding thyristor is opened in timing, and the correspondence producing according to required output frequency is exported commutation signal accurately.
4. transformer low frequency heater according to claim 1, it is characterized in that: described produces harmonic wave and idle harmonic reactive-load compensation device for administering input power, fixing harmonic wave and reactive power that this compensator compensates is produced at power supply input side when the rectification by rectification unit, improve the load capacity of mains side, reduce the wave distortion of input power.
5. transformer low frequency heater according to claim 1, it is characterized in that: described for measuring the measuring unit of frequency conversion rectifier unit output voltage current effective value and waveform, this low frequency heater produces ultra-low frequency alternating voltage electric current for heating, the size of output voltage current amplitude is measured by corresponding effective value and waveform measurement unit, and is sent to control cabinet for showing and feedback calculating.
6. transformer low frequency heater according to claim 1, it is characterized in that: described is the temperature measuring unit of transformer temperature rise for measuring heated object, in heating process, to monitor temperature and the temperature rise situation of heated transformer the moment, corresponding metrical information is sent to control cabinet for showing and temperature control.
7. transformer low frequency heater according to claim 1, it is characterized in that: the described control cabinet for remote interaction control and calculating, receive the voltage and current measurement information transmitting from output voltage current measuring unit, receive heated transformer temperature and temperature information that temperature measuring unit transmits, by corresponding calculating, draw the control command of corresponding control output voltage electric current lifting and corresponding FREQUENCY CONTROL instruction, control thyristor trigger controller, control final output voltage current amplitude and frequency
.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410068619.6A CN103840675A (en) | 2014-02-27 | 2014-02-27 | Low-frequency heating device of transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410068619.6A CN103840675A (en) | 2014-02-27 | 2014-02-27 | Low-frequency heating device of transformer |
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| CN103840675A true CN103840675A (en) | 2014-06-04 |
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| CN201410068619.6A Pending CN103840675A (en) | 2014-02-27 | 2014-02-27 | Low-frequency heating device of transformer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841875A (en) * | 2017-03-01 | 2017-06-13 | 国家电网公司 | Three-Phase Distribution Transformers temperature rise test system and method based on alternating low frequency heating |
| CN107424805A (en) * | 2017-09-08 | 2017-12-01 | 苏州华电电气股份有限公司 | A kind of heater of ultralow frequency high power three-phase transformer |
| CN108321712A (en) * | 2018-04-20 | 2018-07-24 | 国网电力科学研究院武汉南瑞有限责任公司 | A kind of transportable transformer device body drying device |
| CN113934243A (en) * | 2021-10-11 | 2022-01-14 | 上海希形科技有限公司 | Temperature equalization control method and system for parallel thyristors |
Citations (4)
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| DE19501323A1 (en) * | 1995-01-19 | 1996-07-25 | Micafil Vakuumtechnik Ag | Process for drying solid insulation of electrical equipment transformer |
| CN2780989Y (en) * | 2004-01-13 | 2006-05-17 | 本溪经济开发区博大电器设备有限公司 | Low-frequency oil well electric heating device |
| CN202009333U (en) * | 2011-03-01 | 2011-10-12 | 苏州工业园区海沃科技有限公司 | Drying low-frequency heating power source for insulating materials of large transformers |
| CN203788158U (en) * | 2014-02-27 | 2014-08-20 | 苏州华电电气股份有限公司 | Low frequency heating device of transformer |
-
2014
- 2014-02-27 CN CN201410068619.6A patent/CN103840675A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19501323A1 (en) * | 1995-01-19 | 1996-07-25 | Micafil Vakuumtechnik Ag | Process for drying solid insulation of electrical equipment transformer |
| CN2780989Y (en) * | 2004-01-13 | 2006-05-17 | 本溪经济开发区博大电器设备有限公司 | Low-frequency oil well electric heating device |
| CN202009333U (en) * | 2011-03-01 | 2011-10-12 | 苏州工业园区海沃科技有限公司 | Drying low-frequency heating power source for insulating materials of large transformers |
| CN203788158U (en) * | 2014-02-27 | 2014-08-20 | 苏州华电电气股份有限公司 | Low frequency heating device of transformer |
Non-Patent Citations (1)
| Title |
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| 童明儒 等: "交-交变频器在变压器低频加热真空干燥工艺中的应用", 《变压器》, no. 1, 31 January 1989 (1989-01-31) * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841875A (en) * | 2017-03-01 | 2017-06-13 | 国家电网公司 | Three-Phase Distribution Transformers temperature rise test system and method based on alternating low frequency heating |
| CN106841875B (en) * | 2017-03-01 | 2024-05-03 | 国家电网公司 | Three-phase distribution transformer temperature rise test system and method based on alternating-current low-frequency heating |
| CN107424805A (en) * | 2017-09-08 | 2017-12-01 | 苏州华电电气股份有限公司 | A kind of heater of ultralow frequency high power three-phase transformer |
| CN108321712A (en) * | 2018-04-20 | 2018-07-24 | 国网电力科学研究院武汉南瑞有限责任公司 | A kind of transportable transformer device body drying device |
| CN113934243A (en) * | 2021-10-11 | 2022-01-14 | 上海希形科技有限公司 | Temperature equalization control method and system for parallel thyristors |
| CN113934243B (en) * | 2021-10-11 | 2022-05-31 | 上海希形科技有限公司 | Temperature equalization control method and system for parallel thyristors |
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Application publication date: 20140604 |