CN103594233A - 220kV main transformer on-site insulation drying device and technology thereof - Google Patents
220kV main transformer on-site insulation drying device and technology thereof Download PDFInfo
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Abstract
The invention relates to a 220kV main transformer on-site insulation drying device which comprises a transformer oil tank. A three-phase winding is arranged in the transformer oil tank. The 220kV main transformer on-site insulation drying device is characterized in that a phi80 connecting pipe is arranged at the top of the transformer oil tank, the two ends of the phi80 connecting pipe are respectively provided with a phi80 T-branch pipe, the other two ways of each phi80 T-branch pipe are connected with a spraying oil guiding iron pipe which is communicated to a main transformer body winding and a heater which is used for heating a transformer body in a spraying mode under atmosphere pressure respectively. An oil inlet side of each heater is communicated with the lower portion of the transformer oil tanker. The 220kV main transformer on-site insulation drying device is simple in structure, convenient to operate, simple in technology and good in drying effect, the technical problems of transformer high-low voltage winding dielectric loss and unqualified insulation resistance performance indexes can be effectively solved, the on-site working requirement can be met, and normal operation of equipment is guaranteed.
Description
Technical field
The present invention relates to a kind of 220KV main transformer on-the-spot insulation drying device and technique thereof, be applied to the on-the-spot insulation of 220kV main transformer dry.
Background technology
The insulation defect existing for eliminating transformer makes it possess design rated performance directive function, guarantees effectively to improve the insulation level of the whole Oil-Paper Insulation of transformer, need to carry out the processing of heating oil in vacuum spray drying; And existing processing unit and technological work poor effect thereof cannot effectively meet the dry requirement of insulation of 220kV main transformer.Therefore for the problems referred to above, are, objects that the present invention studies.
Summary of the invention
The present invention is to provide a kind of 220KV main transformer on-the-spot insulation drying device and technique thereof, contribute to the insulation drying effect that solves existing 220kV main transformer cannot meet the problems such as the dry demand of on-the-spot insulation.
The invention is characterized in: the on-the-spot insulation of a kind of 220kV main transformer drying device, comprise oil tank of transformer, in described oil tank of transformer, be provided with three phase windings, it is characterized in that: described transformer oil box top is provided with Φ 80 unions, Φ 80 three-way pipes are installed respectively at the two ends of described Φ 80 unions, wherein the another two-way of Φ 80 three-way pipes is connected with respectively one and leads to spray Oil Guide iron pipe on main transformer body winding and in order to the heater to spray heating under transformer body atmospheric pressure, the oil-feed side of described heater and transformer oil lower box part UNICOM.
The spray Oil Guide iron pipe of one of them is laid in fuel tank internal high-voltage connection side main transformer high and low pressure winding top board top through C phase bushing mounting flange hole, another spray Oil Guide iron pipe is laid in fuel tank internal low-voltage lead side main transformer high and low pressure winding top board top through neutral bushing mounting flange hole, and two spray Oil Guide iron pipes are the Φ 50 spray Oil Guide iron pipes isometric with three phase winding lateral lengths.
Described heater comprises in order to the gear oil pump of oil transportation and the heating tube in order to heat.
The dry air generator that described transformer oil box top is also connected with a vacuum unit and is connected with vacuum unit.
Between described heater oil-feed side and transformer oil lower box part, be also provided with mercurial thermometer and measure pore.
Described transformer oil upper box part side is established and be statistics have shown vacuum gauge.
On the pipeline that described Φ 80 three-way pipes are connected with another two-way, be also provided with DN80 vacuum butterfly valve.
Described heater adopts Φ 80 ripple oil transportation steel pipes respectively and between Φ 80 three-way pipes and oil tank of transformer bottom.
Described oil tank of transformer bottom is also provided with electric boiling plate.
Another technical characterictic of the present invention is: a kind of drying process, is characterized in that: carry out as follows:
1) the first pumping high vacuum water smoking
This stage is high vacuum stage of Fig, and vacuum degree is less than below 133Pa, and the lower drying effect of vacuum degree is better, and this pumping high vacuum duration in stage is 8h;
2) warm-up phase
1. use nitrogen drying air generator vacuum breaker, time is controlled at 2h, toward transformer body, inject 2-3t dry with transformer oil, the oil mass of injecting should guarantee to reach lower clamping piece height unshakable in one's determination, just to flood bottom unshakable in one's determination, be advisable, in device body when atmospheric pressure state, two cover Sprayer Circulation systems are carried out oily circulated sprinkling heating and the heating of fuel tank bottom hot plate, make winding and temperature unshakable in one's determination fast rising equably, the convective heat transfer that utilizes the water vapour that thermal capacitance is larger, moisture fully overflows;
2. when fuel-tank outlet oil temperature is consistent with each point for measuring temperature temperature, temperature rises to 60-70 ℃ gradually;
3. this phases-time is controlled at 10h, requires the programming rate of initial spray oil unsuitable too fast, must improve gradually oil temperature;
3) the second pumping high vacuum water smoking
This stage is high vacuum stage of Fig, and vacuum degree is less than below 133Pa, and the lower drying effect of vacuum degree is better, and this pumping high vacuum duration in stage is 8h;
4) heating period
1. use nitrogen drying air generator vacuum breaker, the time is controlled at 2h;
2. when fuel-tank outlet oil temperature is consistent with each point for measuring temperature temperature, temperature rises to 90-95 ℃ gradually;
This phases-time is controlled at 10h, requires the programming rate of spray oil unsuitable too fast, must improve gradually oil temperature; 5) the 3rd pumping high vacuum water smoking
This stage is high vacuum stage of Fig, and vacuum degree is less than below 133Pa, and the lower drying effect of vacuum degree is better, and this pumping high vacuum duration in stage is 8h;
So circulate under atmospheric pressure heating and pumping high vacuum, until under atmospheric pressure measure standby main transformer high and low pressure winding, unshakable in one's determination, folder insulation against ground resistance value with dispatch from the factory, history value compares close and keeps stablizing 1-2 days;
6) dry run monitoring and judgement
1. between dry period, every 1h records fuel tank and imports and exports oil temperature and vacuum degree.Change oil at every turn and record vacuum pump water yield;
2. under atmospheric pressure state every 2h with 250 or 500M Ω instrument measurement measure high and low coil, iron core and folder insulation against ground resistance value;
Carry out insulating oil water content test, carry out standby main transformer high and low pressure winding, unshakable in one's determination, folder insulation against ground resistance measurement, when insulation resistance absolute value and absorptance are converted to 20 ℃, that check technical standard value is installed is close with transformer, can think spray drying end-of-job, otherwise continue dry spray, process.
Advantage of the present invention: the present invention is simple in structure, simple operation, technique is simple, and drying effect is good, can effectively meet field operation demand, and support equipment reaches design performance index and normally moves.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention.
Embodiment
With reference to figure 1, the present invention relates to the on-the-spot insulation of a kind of 220kV main transformer drying device, comprise oil tank of transformer 1, in described oil tank of transformer, be provided with three phase windings 2, described transformer oil box top is provided with Φ 80 unions 3, Φ 80 three-way pipes are installed respectively at the two ends of described Φ 80 unions, wherein the another two-way of Φ 80 three-way pipes is connected with respectively one and leads to spray Oil Guide iron pipe 4 on main transformer body winding and in order to the heater 5 to spray heating under transformer body atmospheric pressure, the oil-feed side of described heater and transformer oil lower box part UNICOM.
The spray Oil Guide iron pipe of one of them is laid in fuel tank internal high-voltage connection side main transformer high and low pressure winding top board top through C phase bushing mounting flange hole, another spray Oil Guide iron pipe is laid in fuel tank internal low-voltage lead side main transformer high and low pressure winding top board top through neutral bushing mounting flange hole, and two spray Oil Guide iron pipes are the Φ 50 spray Oil Guide iron pipes isometric with three phase winding lateral lengths.
Above-mentioned heater 5 comprises in order to the gear oil pump 5-1 of oil transportation and the heating tube 5-2 in order to heat.
The dry air generator 9 that above-mentioned transformer oil box top is also connected with a vacuum unit 8 and is connected with vacuum unit.
Between above-mentioned heater oil-feed side and transformer oil lower box part, be also provided with mercurial thermometer and measure pore 10.
Above-mentioned transformer oil upper box part side is established and be statistics have shown vacuum gauge 11.
On the pipeline that above-mentioned Φ 80 three-way pipes are connected with another two-way, be also provided with DN80 vacuum butterfly valve 12.
Above-mentioned heater adopts Φ 80 ripple oil transportation steel pipes 13 respectively and between Φ 80 three-way pipes and oil tank of transformer bottom.
Above-mentioned oil tank of transformer bottom is also provided with electric boiling plate 14.
Drying process of the present invention, carries out as follows:
1) the first pumping high vacuum water smoking
This stage is high vacuum stage of Fig, and vacuum degree is less than below 133Pa, and the lower drying effect of vacuum degree is better, and this pumping high vacuum duration in stage is 8h;
2) warm-up phase
1. use nitrogen drying air generator vacuum breaker, time is controlled at 2h, toward transformer body, inject 2-3t dry with transformer oil, the oil mass of injecting should guarantee to reach lower clamping piece height unshakable in one's determination, just to flood bottom unshakable in one's determination, be advisable, in device body when atmospheric pressure state, two cover Sprayer Circulation systems are carried out oily circulated sprinkling heating and the heating of fuel tank bottom hot plate, make winding and temperature unshakable in one's determination fast rising equably, the convective heat transfer that utilizes the water vapour that thermal capacitance is larger, moisture fully overflows;
2. when fuel-tank outlet oil temperature is consistent with each point for measuring temperature temperature, temperature rises to 60-70 ℃ gradually;
3. this phases-time is controlled at 10h, requires the programming rate of initial spray oil unsuitable too fast, must improve gradually oil temperature;
3) the second pumping high vacuum water smoking
This stage is high vacuum stage of Fig, and vacuum degree is less than below 133Pa, and the lower drying effect of vacuum degree is better, and this pumping high vacuum duration in stage is 8h;
4) heating period
1. use nitrogen drying air generator vacuum breaker, the time is controlled at 2h;
2. when fuel-tank outlet oil temperature is consistent with each point for measuring temperature temperature, temperature rises to 90-95 ℃ gradually;
This phases-time is controlled at 10h, requires the programming rate of spray oil unsuitable too fast, must improve gradually oil temperature; 5) the 3rd pumping high vacuum water smoking
This stage is high vacuum stage of Fig, and vacuum degree is less than below 133Pa, and the lower drying effect of vacuum degree is better, and this pumping high vacuum duration in stage is 8h;
So circulate under atmospheric pressure heating and pumping high vacuum, until under atmospheric pressure measure standby main transformer high and low pressure winding, unshakable in one's determination, folder insulation against ground resistance value with dispatch from the factory, history value compares close and keeps stablizing 1-2 days;
6) dry run monitoring and judgement
1. between dry period, every 1h records fuel tank and imports and exports oil temperature and vacuum degree.Change oil at every turn and record vacuum pump water yield;
2. under atmospheric pressure state every 2h with 250 or 500M Ω instrument measurement measure high and low coil, iron core and folder insulation against ground resistance value;
Carry out insulating oil water content test, carry out standby main transformer high and low pressure winding, unshakable in one's determination, folder insulation against ground resistance measurement, when insulation resistance absolute value and absorptance are converted to 20 ℃, that check technical standard value is installed is close with transformer, can think spray drying end-of-job, otherwise continue dry spray, process.
Specific implementation process:
Transformer field heating oil in vacuum spray drying is usingd the drying chamber that the fuel tank of transformer is used as drier body, at fuel tank internal, from C phase bushing, neutral bushing mounting flange hole, toward main transformer body high and low pressure winding, two Φ 50 spray Oil Guide iron pipes isometric with three phase winding lateral lengths are installed respectively, on spray Oil Guide iron pipe, be drilled with two row N Φ 4mm apertures, spray direction is aimed at three phase winding top boards and winding surface.Φ 80 three-way pipes are installed respectively at Φ 80 union two ends, main transformer body case top, a-road-through spray Oil Guide iron pipe, and a-road-through heater, as shown in Figure 1.
At transformer-cabinet bottom diagonal angle DN150, DN80 vacuum butterfly valve place, the heater that two covers contain high-lift oil transmission gear pump and heating tube, show and control switching heating tube with temperature is installed, to guarantee that under atmospheric pressure, the oily flow by shower is not less than 100m
3/ h.
Connect spray Oil Guide iron pipe, electric heating machine, vacuum unit, dry air generator and turnover oil pipe line, the oil mass of injecting in casing should guarantee to reach lower clamping piece height unshakable in one's determination simultaneously, just to flood bottom unshakable in one's determination, be advisable, the oil of injection should be dry transformer technical oil.
After the every cover system of two cover Circulation and Hot Oil Spray systems is connected oil transmission gear pump power supply, oil is extracted out and pressurizeed from main transformer bottom, by electric heater, be heated to uniform temperature, divide two-way to enter main transformer body case top Φ 80 unions and spray Oil Guide iron pipe, spray to respectively iron core, folder and winding inner, surperficial, make surface unshakable in one's determination, the inside and outside portion of winding be heated, be dried.
, folder lead-out wire sleeve pipe unshakable in one's determination by standby main transformer, neutral bushing mounting flange cover plate boring installing insulating small casing is drawn high and low pressure winding, iron core, folder measurement insulation resistance connecting line, and earth connection is taken from factory building ground network.
The special-purpose dry air machine of vacuum breaker, should select can be by air heat to 50 ℃ left and right, dew point can guarantee≤-55 ℃, specified displacement>=6m
3/ min.
It is the filter core of 10 μ m that insulation oil vacuum circulating treating system is answered service precision, effectively the impurity in filtering technique oil.
Before each equipment is installed, reply equipment carries out necessary maintenance, and verification is qualified again for each meter meter, and each pipeline connecting should be guaranteed heat-resisting and good seal, reduces joint as far as possible, and heat-resisting rubber cushion sealing is used in joint, prevents gas leakage; Fuel tank integral body is answered good seal.
When fuel tank bottom is used electric boiling plate to assist heating, for preventing local overheating, should between electric boiling plate and fuel tank bottom, place sheet metal, the bottom temp of fuel tank can not surpass 100 ℃, aging to prevent the insulating board at pad unshakable in one's determination angle.
Heater must have temperature overheating protective device, when oil heats, during as oil pump hang-up or oil overheating, must disconnect in time heating tube, prevents fire.
In order regulating and controlling heater to export oil temperature, electric heating machine should possess grouping and automatically control heating function.
At oil tank of transformer, inspection hole is set, to understand in time spray situation.
Heating oil in vacuum spray drying key control technology index:
The inner residual voltage of high vacuum stage of Fig is: < 133Pa.
Each position heating and temperature control index:
High-tension coil portion temperature: 85-90 ℃.
Core portion temperature: 80-85 ℃.
Heater outlet oil temperature: 90-95 ℃.
Drying process under said apparatus, carries out as follows:
1) the first pumping high vacuum water smoking
This stage is high vacuum stage of Fig, and vacuum degree is less than below 133Pa, and the lower drying effect of vacuum degree is better, and this pumping high vacuum duration in stage is 8h;
2) warm-up phase
1. use nitrogen drying air generator vacuum breaker, time is controlled at 2h, toward transformer body, inject 2-3t dry with transformer oil, the oil mass of injecting should guarantee to reach lower clamping piece height unshakable in one's determination, just to flood bottom unshakable in one's determination, be advisable, in device body when atmospheric pressure state, two cover Sprayer Circulation systems are carried out oily circulated sprinkling heating and the heating of fuel tank bottom hot plate, make winding and temperature unshakable in one's determination fast rising equably, the convective heat transfer that utilizes the water vapour that thermal capacitance is larger, moisture fully overflows;
2. when fuel-tank outlet oil temperature is consistent with each point for measuring temperature temperature, temperature rises to 60-70 ℃ gradually;
3. this phases-time is controlled at 10h, requires the programming rate of initial spray oil unsuitable too fast, must improve gradually oil temperature;
3) the second pumping high vacuum water smoking
This stage is high vacuum stage of Fig, and vacuum degree is less than below 133Pa, and the lower drying effect of vacuum degree is better, and this pumping high vacuum duration in stage is 8h;
4) heating period
1. use nitrogen drying air generator vacuum breaker, the time is controlled at 2h;
2. when fuel-tank outlet oil temperature is consistent with each point for measuring temperature temperature, temperature rises to 90-95 ℃ gradually;
This phases-time is controlled at 10h, requires the programming rate of spray oil unsuitable too fast, must improve gradually oil temperature; 5) the 3rd pumping high vacuum water smoking
This stage is high vacuum stage of Fig, and vacuum degree is less than below 133Pa, and the lower drying effect of vacuum degree is better, and this pumping high vacuum duration in stage is 8h;
So circulate under atmospheric pressure heating and pumping high vacuum, until under atmospheric pressure measure standby main transformer high and low pressure winding, unshakable in one's determination, folder insulation against ground resistance value with dispatch from the factory, history value compares close and keeps stablizing 1-2 days;
6) dry run monitoring and judgement
1. between dry period, every 1h records fuel tank and imports and exports oil temperature and vacuum degree.Change oil at every turn and record vacuum pump water yield;
2. under atmospheric pressure state every 2h with 250 or 500M Ω instrument measurement measure high and low coil, iron core and folder insulation against ground resistance value;
3. carry out insulating oil water content test, carry out standby main transformer high and low pressure winding, unshakable in one's determination, folder insulation against ground resistance measurement, when insulation resistance absolute value and absorptance are converted to 20 ℃, that check technical standard value is installed is close with transformer, can think spray drying end-of-job, otherwise continue dry spray, process.
After above-mentioned technique, also can carry out the processing of transformer dry after qualified, it comprises: remove spray system, vacuum system pipeline, get rid of transformer oil in casing, remove spray oil guide pipe, measure insulation resistance connecting line; Hang cover inspection, transformer body is arranged, compresses, checked, carry out electric checking test; Change all seals and valve; Housing, installs the seat that raises, high-low pressure, neutral bushing, the annexes such as pressure relief valve, shunting switch; Regulation completes above-mentioned work in the time limit after, fuel tank is vacuumized to leak detection, vacuum degree is increased between 133-50Pa after normal, maintain 12h, can carry out vacuum oil; With the oiling of 5-6t/h speed, pasta stops oiling apart from case top cover 200mm place, and continues to vacuumize 4h; Stop vacuumizing, vacuum breaker, installs oil conservator, from top to fuel tank and conservator, carries out repairing; After repairing finishes, get rid of each high some survival gas, the quiet 48h of putting, and every 24h gets rid of the survival gas in a transformer; The whole office of standby main transformer puts, winding deformation test.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. the on-the-spot insulation of 220kV main transformer drying device, comprise oil tank of transformer, in described oil tank of transformer, be provided with three phase windings, it is characterized in that: described transformer oil box top is provided with Φ 80 unions, Φ 80 three-way pipes are installed respectively at the two ends of described Φ 80 unions, wherein the another two-way of Φ 80 three-way pipes is connected with respectively one and leads to spray Oil Guide iron pipe on main transformer body winding and in order to the heater to spray heating under transformer body atmospheric pressure, the oil-feed side of described heater and transformer oil lower box part UNICOM.
2. the on-the-spot insulation of a kind of 220kV main transformer according to claim 1 drying device, it is characterized in that: the spray Oil Guide iron pipe of one of them is laid in fuel tank internal high-voltage connection side main transformer high and low pressure winding top board top through C phase bushing mounting flange hole, another spray Oil Guide iron pipe is laid in fuel tank internal low-voltage lead side main transformer high and low pressure winding top board top through neutral bushing mounting flange hole, and two spray Oil Guide iron pipes are the Φ 50 spray Oil Guide iron pipes isometric with three phase winding lateral lengths.
3. the on-the-spot insulation of a kind of 220kV main transformer according to claim 1 drying device, is characterized in that: described heater comprises in order to the gear oil pump of oil transportation and the heating tube in order to heat.
4. the on-the-spot insulation of a kind of 220kV main transformer according to claim 1 drying device, is characterized in that: the dry air generator that described transformer oil box top is also connected with a vacuum unit and is connected with vacuum unit.
5. the on-the-spot insulation of a kind of 220kV main transformer according to claim 1 drying device, is characterized in that: between described heater oil-feed side and transformer oil lower box part, be also provided with mercurial thermometer and measure pore.
6. the on-the-spot insulation of a kind of 220kV main transformer according to claim 1 drying device, is characterized in that: described transformer oil upper box part side is established and be statistics have shown vacuum gauge.
7. the on-the-spot insulation of a kind of 220kV main transformer according to claim 1 drying device, is characterized in that: on the pipeline that described Φ 80 three-way pipes are connected with another two-way, be also provided with DN80 vacuum butterfly valve.
8. the on-the-spot insulation of a kind of 220kV main transformer according to claim 1 drying device, is characterized in that: described heater adopts Φ 80 ripple oil transportation steel pipes respectively and between Φ 80 three-way pipes and oil tank of transformer bottom.
9. the on-the-spot insulation of a kind of 220kV main transformer according to claim 1 drying device, is characterized in that: described oil tank of transformer bottom is also provided with electric boiling plate.
10. the drying process under the Arbitrary Term structure based on described in aforesaid right 1 to 9, is characterized in that: carry out as follows:
1) the first pumping high vacuum water smoking
This stage is high vacuum stage of Fig, and vacuum degree is less than below 133Pa, and the lower drying effect of vacuum degree is better, and this pumping high vacuum duration in stage is 8h;
2) warm-up phase
1. use nitrogen drying air generator vacuum breaker, time is controlled at 2h, toward transformer body, inject 2-3t dry with transformer oil, the oil mass of injecting should guarantee to reach lower clamping piece height unshakable in one's determination, just to flood bottom unshakable in one's determination, be advisable, in device body when atmospheric pressure state, two cover Sprayer Circulation systems are carried out oily circulated sprinkling heating and the heating of fuel tank bottom hot plate, make winding and temperature unshakable in one's determination fast rising equably, the convective heat transfer that utilizes the water vapour that thermal capacitance is larger, moisture fully overflows;
2. when fuel-tank outlet oil temperature is consistent with each point for measuring temperature temperature, temperature rises to 60-70 ℃ gradually;
3. this phases-time is controlled at 10h, requires the programming rate of initial spray oil unsuitable too fast, must improve gradually oil temperature;
3) the second pumping high vacuum water smoking
This stage is high vacuum stage of Fig, and vacuum degree is less than below 133Pa, and the lower drying effect of vacuum degree is better, and this pumping high vacuum duration in stage is 8h;
4) heating period
1. use nitrogen drying air generator vacuum breaker, the time is controlled at 2h;
2. when fuel-tank outlet oil temperature is consistent with each point for measuring temperature temperature, temperature rises to 90-95 ℃ gradually;
This phases-time is controlled at 10h, requires the programming rate of spray oil unsuitable too fast, must improve gradually oil temperature; 5) the 3rd pumping high vacuum water smoking
This stage is high vacuum stage of Fig, and vacuum degree is less than below 133Pa, and the lower drying effect of vacuum degree is better, and this pumping high vacuum duration in stage is 8h;
So circulate under atmospheric pressure heating and pumping high vacuum, until under atmospheric pressure measure standby main transformer high and low pressure winding, unshakable in one's determination, folder insulation against ground resistance value with dispatch from the factory, history value compares close and keeps stablizing 1-2 days;
6) dry run monitoring and judgement
1. between dry period, every 1h records fuel tank and imports and exports oil temperature and vacuum degree.Change oil at every turn and record vacuum pump water yield;
2. under atmospheric pressure state every 2h with 250 or 500M Ω instrument measurement measure high and low coil, iron core and folder insulation against ground resistance value;
Carry out insulating oil water content test, carry out standby main transformer high and low pressure winding, unshakable in one's determination, folder insulation against ground resistance measurement, when insulation resistance absolute value and absorptance are converted to 20 ℃, that check technical standard value is installed is close with transformer, can think spray drying end-of-job, otherwise continue dry spray, process.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310621259.3A CN103594233B (en) | 2013-11-29 | 2013-11-29 | A kind of 220kV main transformer scene insulation torrefaction device and technique thereof |
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|---|---|---|---|
| CN201310621259.3A CN103594233B (en) | 2013-11-29 | 2013-11-29 | A kind of 220kV main transformer scene insulation torrefaction device and technique thereof |
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Cited By (5)
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| CN103903834A (en) * | 2014-04-17 | 2014-07-02 | 中国北车集团大连机车车辆有限公司 | Insulating oil injection system and method for main transformer of electric locomotive |
| CN104103409A (en) * | 2014-06-20 | 2014-10-15 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Converter transformer as well as site drying processing method and site drying processing equipment of converter transformer |
| CN104332284A (en) * | 2014-10-16 | 2015-02-04 | 中国南方电网有限责任公司超高压输电公司天生桥局 | Hot oil spray and drying device and method for converter transformer |
| CN111537800A (en) * | 2020-05-25 | 2020-08-14 | 国家电网有限公司 | Intelligent power transformer dielectric loss factor and insulation resistance measuring device |
| CN111634527A (en) * | 2020-05-29 | 2020-09-08 | 广东能建电力设备厂有限公司 | Transformer body storage device and method for storing transformer body |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN104332284A (en) * | 2014-10-16 | 2015-02-04 | 中国南方电网有限责任公司超高压输电公司天生桥局 | Hot oil spray and drying device and method for converter transformer |
| CN111537800A (en) * | 2020-05-25 | 2020-08-14 | 国家电网有限公司 | Intelligent power transformer dielectric loss factor and insulation resistance measuring device |
| CN111634527A (en) * | 2020-05-29 | 2020-09-08 | 广东能建电力设备厂有限公司 | Transformer body storage device and method for storing transformer body |
| CN111634527B (en) * | 2020-05-29 | 2022-06-21 | 广东能建电力设备厂有限公司 | Method for storing transformer body |
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