CN104036939A - Direct-current heating drying method and direct-current heating device used for large electric reactor on site - Google Patents
Direct-current heating drying method and direct-current heating device used for large electric reactor on site Download PDFInfo
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- CN104036939A CN104036939A CN201410311049.9A CN201410311049A CN104036939A CN 104036939 A CN104036939 A CN 104036939A CN 201410311049 A CN201410311049 A CN 201410311049A CN 104036939 A CN104036939 A CN 104036939A
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Abstract
The invention relates to technologies of insulating drying of electric reactors, in particular to a direct-current heating drying method and a direct-current heating device used for a large electric reactor on site. The direct-current heating drying method comprises the following steps that firstly, a direct current is applied to a winding of the electric reactor to be dried in an insulating mode, the winding of the electric reactor emits heat, and the reactor body is heated to be at a designated temperature from the interior; then, vacauumizing is carried out on the electric reactor; finally, hot-oil circulation is carried out on the electric reactor. Under the circumstance that the on-site temperature is very low, the temperature of transformer oil can rise above 70 DEG C, and the purpose of drying can be achieved rapidly. According to the direct-current heating technology, a good drying effect is achieved, uniform and efficient heating is achieved, a drying treatment period is shortened greatly, and the direct-current heating drying method and the direct-current heating device are suitable for heating drying of the large electric reactor on site.
Description
Technical field
The present invention relates to reactor insulation dry technology, relate in particular to a kind of large-scale reactor In situ DC heating and drying method and DC heating device.
Background technology
When large-scale reactor is tested at the scene, often due to the reason such as transformer oil makes moist or temperature is low, and cause carrying out on-the-spot commissioning test.At present, the on-the-spot heat drying of Chinese large-sized power reactor still adopts traditional oil filter Circulation and Hot Oil Spray method, for the change of capacity, just increases Circulation and Hot Oil Spray time, pumpdown time and quiet putting the time, in-situ processing time length and inefficiency.In the situation that ambient temperature is very low, be subject to the restriction of oil filter heating efficiency, in Circulation and Hot Oil Spray, transformer oil can only be heated to lower temperature, even if extend the Circulation and Hot Oil Spray time, is also difficult to reach good drying effect.
Except deep fat round-robin method, adoptable reactor insulation drying means also comprises: fuel tank iron loss seasoning and excitation method.Wherein, the heat generation of fuel tank iron loss method, on fuel tank tank wall, then transmits to device body insulation by insulating oil, and the efficiency of heating surface is low, and insulated part temperature raises slow, and that excitation method cannot reach test is at the scene required to voltage.Therefore, fuel tank iron loss method and excitation method are not all suitable for on-the-spot heat drying processing super, extra-high voltage reactor.
Summary of the invention
The problem existing for solving above-mentioned insulation seasoning, the present invention utilizes the principle of DC heating technology, and a kind of method of large-scale reactor being carried out to In situ DC heat drying is provided, and has designed corresponding DC heating device for the method.
Large-scale reactor In situ DC heating and drying method of the present invention, concrete steps are as follows: first, treat the dry reactor winding of insulation and apply direct current, reactor heating in winding, is heated to assigned temperature from inside by the insulation of device body; Then, reactor is vacuumized to processing; Finally, reactor is carried out to Circulation and Hot Oil Spray processing.The present invention, by reactor winding is directly applied to direct voltage, makes to flow through direct current in winding, and the heat that utilizes reactor winding directly to hinder loss generation heats reactor.And then through vacuumizing and Circulation and Hot Oil Spray processing, take the moisture in insulation out of, thereby reach dry effect.To greatly improve like this efficiency of heating surface, shorten heating time.Meanwhile, due to this mode of heating be winding from the inner heat of device body, the drying effect of device body insulation is better than common Circulation and Hot Oil Spray method.
In the time reactor being carried out to DC heating test, measure and observe at any time the size of current applying by corresponding instrument, note the direct current applying to be controlled at the 70%-85% of reactor load current value.In the time that transformer oil temperature is too low, in the case of iron core not being caused unnecessary injury, can suitably regulate size of current.Like this can protection reactor iron core and coil, can reach again heating effect.
The DC heating device that said method is used, comprise AC power, voltage regulator, rectification circuit and voltmeter and ammeter, AC power is connected with voltage regulator input through the first circuit breaker, and output voltage regulator connects rectification circuit input end, and rectification circuit output end is connected with reactor; Between rectification circuit and reactor, be in series with the second circuit breaker, current protective device and ammeter, be parallel with voltmeter between the two.Voltage regulator is used for controlling Voltage-output size for voltage regulator, to reach the object of controlling rectifier cabinet output current size.Rectification circuit, for interchange is converted to direct current, is supplied with reactor, realizes DC heating.Voltmeter and ammeter, for measuring at any time the voltage and current of reactor, meet test requirements document.Circuit breaker has arc extinguishing effect, protects personal device security, can realize circuit load switching simultaneously.
Described voltage regulator is provided with voltage regulator control operation platform.After drop into test loop, control voltage regulator control loop, voltage regulator output voltage is started from scratch and rise to required magnitude of voltage.
Described AC power is 380V power supply.DC heating device required voltage is low, and 380V can meet the demands.
Described current protective device is fuse, and it act as in the time that electric current exceedes reactor rated current 85%, open circuit.
Described rectification circuit is three-phase six full-wave rectifying circuit of pulsing.
Beneficial effect of the present invention:
1. this DC heating apparatus structure is simple, and mobility is strong, and easy operating can meet the requirement of the on-the-spot heat run of large-scale reactor.
2. in this DC heating technology situation that temperature is very low at the scene, transformer oil can be elevated to more than 70 DEG C, can reach fast dry object; Under equal experimental condition, Circulation and Hot Oil Spray method can only be elevated to temperature of oil in transformer 50 DEG C of left and right, does not reach dry object.
3. this DC heating technology drying effect is good, and homogeneous heating and efficiency are high, and the dry processing duration is shortened greatly, is suitable for the on-the-spot heat drying of large-scale reactor.Meanwhile, can also carry out scene heating to large-scale super extra-high voltage reactor and other various middle-size and small-size reactors.
Brief description of the drawings
Fig. 1 is the elementary diagram of DC heating device of the present invention;
1, AC power, 2, the first circuit breaker, 3, voltage regulator, 4, voltage regulator control operation platform, 5, rectification circuit, 6, the second circuit breaker, 7, fuse, 8, ammeter, 9, voltmeter, 10, reactor.
Embodiment
A kind of large-scale reactor In situ DC heater, as shown in the figure, comprise 380V AC power 1, voltage regulator 3, rectification circuit 5 and voltmeter 9 and ammeter 8, AC power 1 is connected with voltage regulator 3 inputs through the first circuit breaker 2, voltage regulator 3 is exported termination rectification circuit 5 inputs, and rectification circuit 5 outputs are connected with reactor 10; Between rectification circuit 5 and reactor 10, be in series with the second circuit breaker 6, fuse 7 and ammeter 8, be parallel with voltmeter 9 between the two.Described voltage regulator 3 is provided with voltage regulator control operation platform 4.Described rectification circuit adopts three-phase six full-wave rectifying circuit of pulsing.
AC power output 380V alternating voltage, regulated as required the ratio of voltage regulator by voltage regulator control operation platform, make voltage regulator output voltage can ensure that rectifier cabinet output current is within the scope of 70% to 85% reactor rated current, voltage regulator output voltage range will be determined by rectifier cabinet output current, then by rectification circuit, alternating voltage is converted to direct voltage, be applied on the winding of reactor to be heated, reactor winding is because straight resistance loss heating, insulate homogeneous heating to assigned temperature from inside by device body, again reactor is vacuumized and Circulation and Hot Oil Spray processing, take the moisture in insulation out of, reach dry effect.Voltmeter and ammeter are measured the voltage and current of reactor at any time, in the time not reaching test requirements document, regulate voltage regulator.When reactor loop current overrate 85% time, fuse action, cutoff circuit, protection reactor.
Claims (7)
1. a large-scale reactor In situ DC heating and drying method, is characterized in that: first, treat the dry reactor winding of insulation and apply direct current, reactor heating in winding, is heated to assigned temperature from inside by the insulation of device body; Then, reactor is vacuumized to processing; Finally, reactor is carried out to Circulation and Hot Oil Spray processing.
2. large-scale reactor In situ DC heating and drying method according to claim 1, is characterized in that: the direct current applying is the 70%-85% of reactor load current value.
3. one kind large-scale reactor In situ DC heater, it is characterized in that: comprise AC power, voltage regulator, rectification circuit and voltmeter and ammeter, AC power is connected with voltage regulator input through the first circuit breaker, output voltage regulator connects rectification circuit input end, and rectification circuit output end is connected with reactor; Between rectification circuit and reactor, be in series with the second circuit breaker, current protective device and ammeter, be parallel with voltmeter between the two.
4. large-scale reactor In situ DC heater according to claim 3, is characterized in that: described voltage regulator is provided with voltage regulator control operation platform.
5. large-scale reactor In situ DC heater according to claim 3, is characterized in that: described AC power is 380V power supply.
6. according to the large-scale reactor In situ DC heater described in claim 3 or 4 or 5, it is characterized in that: described current protective device is fuse.
7. large-scale reactor In situ DC heater according to claim 6, is characterized in that: described rectification circuit is three-phase six full-wave rectifying circuit of pulsing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410311049.9A CN104036939A (en) | 2014-07-02 | 2014-07-02 | Direct-current heating drying method and direct-current heating device used for large electric reactor on site |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410311049.9A CN104036939A (en) | 2014-07-02 | 2014-07-02 | Direct-current heating drying method and direct-current heating device used for large electric reactor on site |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105225819A (en) * | 2015-11-06 | 2016-01-06 | 青海智鑫电力监理咨询有限公司 | A kind of transformer body heating means and application thereof |
| CN107424808A (en) * | 2017-08-19 | 2017-12-01 | 广东天圣高科股份有限公司 | A kind of roller type loop coil contact voltage regulator |
| CN112039302A (en) * | 2020-09-03 | 2020-12-04 | 河北省瑞兆激光机电设备再制造产业技术研究院 | Method for drying motor on site |
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| CN2235180Y (en) * | 1995-08-21 | 1996-09-11 | 姚传江 | Automatic thermostatic drying device for inductance coil |
| CN1656578A (en) * | 2001-09-21 | 2005-08-17 | Abb技术公开股份有限公司 | DC voltage/current heating/gelling/curing of resin encapsulated distribution transformer coils |
| CN101710532A (en) * | 2009-12-07 | 2010-05-19 | 河南省电力公司南阳供电公司 | Method for drying transformer |
| CN101908404A (en) * | 2010-06-30 | 2010-12-08 | 国家电网公司 | Method and device for carrying out field drying on convertor transformer |
| CN101917124A (en) * | 2010-06-30 | 2010-12-15 | 国家电网公司 | Power supply device |
| CN202048756U (en) * | 2011-05-16 | 2011-11-23 | 汕头市新青罐机有限公司 | High frequency induction drying device |
| CN102868264A (en) * | 2012-09-17 | 2013-01-09 | 无锡航天万源新大力电机有限公司 | Stator winding hot-immersion and heating system and process |
| CN103874242A (en) * | 2014-03-19 | 2014-06-18 | 国家电网公司 | Large power transformer low-frequency heating device and achieving method |
| CN203910521U (en) * | 2014-07-02 | 2014-10-29 | 山东电力设备有限公司 | In-situ direct-current heating device for large electric reactor |
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2014
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2235180Y (en) * | 1995-08-21 | 1996-09-11 | 姚传江 | Automatic thermostatic drying device for inductance coil |
| CN1656578A (en) * | 2001-09-21 | 2005-08-17 | Abb技术公开股份有限公司 | DC voltage/current heating/gelling/curing of resin encapsulated distribution transformer coils |
| CN101710532A (en) * | 2009-12-07 | 2010-05-19 | 河南省电力公司南阳供电公司 | Method for drying transformer |
| CN101908404A (en) * | 2010-06-30 | 2010-12-08 | 国家电网公司 | Method and device for carrying out field drying on convertor transformer |
| CN101917124A (en) * | 2010-06-30 | 2010-12-15 | 国家电网公司 | Power supply device |
| CN202048756U (en) * | 2011-05-16 | 2011-11-23 | 汕头市新青罐机有限公司 | High frequency induction drying device |
| CN102868264A (en) * | 2012-09-17 | 2013-01-09 | 无锡航天万源新大力电机有限公司 | Stator winding hot-immersion and heating system and process |
| CN103874242A (en) * | 2014-03-19 | 2014-06-18 | 国家电网公司 | Large power transformer low-frequency heating device and achieving method |
| CN203910521U (en) * | 2014-07-02 | 2014-10-29 | 山东电力设备有限公司 | In-situ direct-current heating device for large electric reactor |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105225819A (en) * | 2015-11-06 | 2016-01-06 | 青海智鑫电力监理咨询有限公司 | A kind of transformer body heating means and application thereof |
| CN107424808A (en) * | 2017-08-19 | 2017-12-01 | 广东天圣高科股份有限公司 | A kind of roller type loop coil contact voltage regulator |
| CN112039302A (en) * | 2020-09-03 | 2020-12-04 | 河北省瑞兆激光机电设备再制造产业技术研究院 | Method for drying motor on site |
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Application publication date: 20140910 |