CN204269747U - A kind of transformer heat ageing real time modelling measurement mechanism - Google Patents
A kind of transformer heat ageing real time modelling measurement mechanism Download PDFInfo
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- CN204269747U CN204269747U CN201420800365.8U CN201420800365U CN204269747U CN 204269747 U CN204269747 U CN 204269747U CN 201420800365 U CN201420800365 U CN 201420800365U CN 204269747 U CN204269747 U CN 204269747U
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Abstract
The utility model relates to a kind of transformer heat ageing real time modelling measurement mechanism, this measurement mechanism is connected with transformer, comprise housing, described transformer comprises oil tank of transformer, described housing is connected with oil tank of transformer, inner fills insulating oil, and described measurement mechanism also comprises and is all located at temperature rise of hot spot analogue unit in housing and insulating paper Aging simulation unit, the input end of described temperature rise of hot spot analogue unit is connected with transformer, output terminal and the hot tie-in of insulating paper Aging simulation unit.Compared with prior art, Warm status when the utility model is run by real time modelling transformer in measurement mechanism, directly can obtain consistent insulating paper sample aging with transformer focus, result the most directly, accurately, need not destroy again the structure of transformer simultaneously.
Description
Technical field
The utility model relates to a kind of transformer heat ageing measuring technique, especially relates to a kind of transformer heat ageing real time modelling measurement mechanism.
Background technology
Oil-immersed power transformer insulation adopts oilpaper (plate) insulation system form, and wherein solid insulation major part is made up of cellulose, and its aging appreciable impact being subject to temperature is called for short heat ageing.At present, heat ageing detection method can be divided into:
(1) ageing products detection method
Transformer Insulation Aging can generate CO and CO2; Furfural; The analytes such as acetone, content and change thereof by detecting these compositions in operation estimate degree of aging, although method is simple for this type of, but due to normal aging and abnormal defect cannot be distinguished, uncontrollable oil sample process is on the impact of result, and therefore by with very large uncertainty, the deviation in aging analysis is larger, can only it can be used as reference, if as criterion, be insensitive, imprecise and insecure.And these class methods can only reflect the average ageing degree of equipment, can not the short slab of embodiment device, bring hidden danger to operation.Therefore, these class methods are only as a reference at present.
(2) electrical test method
Just possess some special knowledge in the seventies in last century based on the return voltage method (RVM) of dielectric response, polarization/depolarization current (PDC) and dielectric spectroscopy (FDS) three kinds of methods, first conduct a research in laboratory as Dielectric Physics phenomenon and characteristic in early days, after be proved the moisture of dielectric response collection of illustrative plates and paper oil insulation and ageing state also exists stronger correlative relationship.The major defect that the method exists is: the source 1) cannot distinguishing moisture in insulating paper, therefore makes moist, the defect such as seepage significantly will change the result of estimation; 2) at present data basis is less, cannot select, the transformer equipment individuality of different service condition estimates comparatively accurately for different structure, different insulative paper; 3) these class methods can only reflect the average ageing degree of equipment, can not the short slab of embodiment device, bring hidden danger to operation; 4) need during test to have a power failure, have impact on the reliability of operation of power networks.To sum up, the method is still in research and development, trial period.
(3) heat ageing real-time computing technique
What heat ageing calculated concern in real time is temperature rise of hot spot, more can embody the local feature of transformer equipment, but due to 1) quantitative relationship of temperature and material aging, not yet determine, comparatively directly cannot obtain degree of aging accurately by temperature results; 2) temperature rise calculates the temperature parameter needed under long-term, a large amount of external parameters such as environment, load, cooling system operation information and transformer different condition, and collect difficulty greatly, therefore the method also can only as the reference frame run.
(4) testing of materials method is sampled
Sampling testing of materials is current aging assessment the most accurately, it carries out degree of polymerization test after gathering inside transformer pattern, obtain aging direct result, but the maximum deficiency of the method is: unless transformer disintegrates completely, it cannot obtain the pattern of inside transformer focus, namely cannot estimate aging short slab; And once disintegrate, the meaning of Aging Assessment is by all gone.
It is many because of in accelerated aging tester and test method that such as Chinese patent CN 101408578 B discloses a kind of transformer oil paper insulation, test unit comprises thermal-electrical aging case, transformer oil paper insulation analogue means is provided with in thermal-electrical aging case, vibrating device and the temperature control equipment for controlling thermal-electrical aging the temperature inside the box, described vibrating device can drive transformer oil paper insulation analogue means to vibrate, transformer oil paper insulation analogue means is electrically connected with high-voltage power supply, but the oil temperature sensor in the such as transformer CT that not do not carry transformer of this test unit and transformer mailbox is used, therefore the first does not consider the temperature rise of hot spot in transformer, and the simulation of accelerated deterioration process can not real time modelling transformer aging conditions, therefore its aging test is accurate not, two be test unit and aging test do not consider the transformer time limit, test unit and can not with the test of the whole life cycle of transformer.
Summary of the invention
The purpose of this utility model is exactly provide a kind of to measure precisely and transformer heat ageing real time modelling measurement mechanism without the need to destroying inside transformer structure to overcome defect that above-mentioned prior art exists.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of transformer heat ageing real time modelling measurement mechanism, this measurement mechanism is connected with transformer, comprise housing, described transformer comprises oil tank of transformer, described housing is connected with oil tank of transformer, inner fills insulating oil, and described measurement mechanism also comprises and is all located at temperature rise of hot spot analogue unit in housing and insulating paper Aging simulation unit, the input end of described temperature rise of hot spot analogue unit is connected with transformer, output terminal and the hot tie-in of insulating paper Aging simulation unit.
Described temperature rise of hot spot analogue unit is temperature rise artifical resistance, and described temperature rise artifical resistance is connected with the secondary terminals of transformer CT.
The insulating paper sample that the multistage that described insulating paper Aging simulation unit comprises the corresponding transformer difference sampling time limit respectively be arranged in parallel, described insulating paper sample all with the hot tie-in of temperature rise artifical resistance.
The hop count of described insulating paper sample is 8-10.
Described temperature rise artifical resistance is adjustable resistance.
Described measurement mechanism also comprises Oil-temperature control unit, described Oil-temperature control unit comprises well heater, controller and the shell temperature sensor for gathering case temperature, the input end of described controller is connected with the output terminal of shell temperature sensor and transformer oil temperature sensor respectively, output terminal is connected with the input end of well heater, and the output terminal of described well heater is all connected with housing with the input end of shell temperature sensor.
Described housing and the hot tie-in of transformer oil box top.
Compared with prior art, the utility model has the following advantages:
1) Warm status when the utility model is run by real time modelling transformer in measurement mechanism, directly can obtain consistent insulating paper sample aging with transformer focus, and result the most directly, accurately, need not destroy again the structure of transformer simultaneously.
2) the utility model avoids the collection of the external many devices of transformer and mass data information, and realize simple, investment is saved.
3) temperature rise artifical resistance is directly connected with the secondary terminals of transformer CT, and Real-time Load information when not needing extra external device collection transformer to run, structure is simple, and cost is low.
4) controller is connected with transformer built-in oil temperature sensor, takes full advantage of the original assembly of transformer.
5) the utility model is when measuring, and does not need equipment to have a power failure and coordinates, on operational reliability without impact.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment one;
Fig. 2 is Oil-temperature control cellular construction schematic diagram in the utility model embodiment two;
Fig. 3 is the structural representation of the utility model embodiment four;
Wherein: 1, housing, 2, transformer, 3, insulating paper sample, 4, Oil-temperature control unit, 21, transformer CT, 22, oil tank of transformer, 41, controller, 42, well heater, 43, shell temperature sensor, 221, oil temperature sensor.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.The present embodiment is implemented premised on technical solutions of the utility model, give detailed embodiment and concrete operating process, but protection domain of the present utility model is not limited to following embodiment.
Embodiment one:
A kind of transformer heat ageing real time modelling measurement mechanism, as shown in Figure 1, this measurement mechanism is connected with transformer 2, comprise housing 1, transformer 2 comprises oil tank of transformer 22, housing 1 is connected with oil tank of transformer 22, inner filling insulating oil, adjustable insulating oil have two, outside employing seals, measurement mechanism also comprises and is all located at temperature rise of hot spot analogue unit in housing 1 and insulating paper Aging simulation unit, and the input end of temperature rise of hot spot analogue unit is connected with transformer 2, and input end is connected with insulating paper Aging simulation unit;
During work, housing 1 temperature is consistent with the oily temperature of top of oil tank of transformer 22, and then the temperature realizing insulating oil in measurement mechanism has temperature of top consistent with in oil tank of transformer 22, temperature rise of hot spot in temperature rise of hot spot analogue unit real time modelling transformer, thus in measurement mechanism real time modelling running state of transformer, and then realize insulating paper Aging simulation unit simulation transformer heat ageing state.
Oil-temperature control unit is temperature rise artifical resistance R
x, temperature rise artifical resistance R
xbe connected with the secondary terminals of transformer CT 21.
Temperature rise artifical resistance R
xfor adjustable resistance, because different moisture content change and the embodiment of different oxygen level change to burn-in effects can be met by regulating resistance.
Housing 1 and oil tank of transformer 22 top hot tie-in, this measurement mechanism can be placed in oil tank of transformer 22 top, and housing 1 is transformer oil temperature of top.
The insulating paper sample 3 that the multistage that insulating paper Aging simulation unit comprises the corresponding transformer difference sampling time limit respectively be arranged in parallel, the hop count of insulating paper sample 3 is 8-10.
The application of the analogue measurement device that above-mentioned transformer heat ageing is real-time, comprises step:
A. be connected with transformer to be measured by measurement mechanism, be specially: by obtaining Real-time Load information with the secondary terminals of transformer CT 21, be converted into when electric current I 1, I1 flows through R and produce temperature rise, this temperature rise is consistent with transformer temperature rise of hot spot, R
xresistance be specially:
R
x＝H×g×c×m
Wherein: H is temperature rise artifical resistance R
xseebeck coefficient, g is that copper oil temperature is poor, and c is temperature rise artifical resistance R
xspecific heat capacity, m is temperature rise artifical resistance R
xquality;
In addition also R to be regulated according to the micro-water of annual insulating oil and measurement of oxygen content result as required
xresistance, such as, when oxygen level doubles, rate of ageing can obviously increase, but for seal transformer, its working environment is more stable, the micro-water of insulating oil and oxygen level more stable, generally can not exceed standard situation.
B. in transformer operational process, measurement mechanism real time modelling running state of transformer, and then realize insulating paper Aging simulation unit real time modelling transformer heat ageing state;
In step B, running state of transformer process is specially: the temperature of Oil-temperature control unit controls housing 1 is consistent with transformer oil temperature of top, simultaneously temperature rise of hot spot in temperature rise of hot spot analogue unit analogue transformer, because temperature rise analogue unit is subject to temperature rise artifical resistance R
xheated in real-time, thus the heat ageing state of insulating paper sample 3 is wherein consistent with inside transformer sample aging character.
C. by carrying out degree of polymerization test to insulating paper Aging simulation unit, and then the measurement to transformer heat ageing state is realized.
Step C is specially: when transformer arrives sampling year in limited time, selects in insulating paper Aging simulation unit one section of insulating paper sample 3 of the time limit carrying out degree of polymerization test.
Embodiment two:
No longer describe with the something in common in embodiment one in the present embodiment, only describe difference.
As shown in Figure 2, the present embodiment is from the significantly different of embodiment one, in the present embodiment, measurement mechanism also comprises Oil-temperature control unit 4, Oil-temperature control unit comprises well heater 42, controller 41 and the shell temperature sensor 43 for gathering housing 1 temperature, the input end of controller 41 is connected with the output terminal of shell temperature sensor 43 and the existing oil temperature sensor of transformer respectively, output terminal is connected with the input end of well heater 42, and the output terminal of well heater 42 is all connected with housing 1 with the input end of shell temperature sensor 43.
The temperature of controller 41 Real-time Collection measurement mechanism housing 1 and the oil temperature of transformer, and then control heater heated shell 1, make housing 1 temperature consistent with transformer oil temperature of top.
Embodiment three:
No longer describe with the something in common in embodiment one in the present embodiment, only describe difference.
The present embodiment is from the significantly different of embodiment one, and in the present embodiment, the insulating paper sample 3 of insulating paper Aging simulation unit is all laterally wrapped in temperature rise artifical resistance R
xon, arrange like this and being heated of insulating paper sample can be made more abundant, simulate effect is truer.
Embodiment four:
No longer describe with the something in common in embodiment one in the present embodiment, only describe difference.
As shown in Figure 3, the present embodiment is from the significantly different of embodiment one, in the present embodiment, and insulating paper sample 3 and the temperature rise artifical resistance R of insulating paper Aging simulation unit
xdirectly do not connect, but realize hot tie-in by insulating oil in measurement mechanism, temperature rise artifical resistance R
xthe heat produced is delivered to insulating paper sample 3 by insulating oil, thus realizes insulating paper Aging simulation unit real time modelling transformer heat ageing state.
Claims (7)
1. a transformer heat ageing real time modelling measurement mechanism, this measurement mechanism is connected with transformer, comprise housing, described transformer comprises oil tank of transformer, it is characterized in that, described housing is connected with oil tank of transformer, inner filling insulating oil, described measurement mechanism also comprises and is all located at temperature rise of hot spot analogue unit in housing and insulating paper Aging simulation unit, and the input end of described temperature rise of hot spot analogue unit is connected with transformer, output terminal and the hot tie-in of insulating paper Aging simulation unit.
2. a kind of transformer heat ageing real time modelling measurement mechanism according to claim 1, it is characterized in that, described temperature rise of hot spot analogue unit is temperature rise artifical resistance, and described temperature rise artifical resistance is connected with the secondary terminals of transformer CT.
3. a kind of transformer heat ageing real time modelling measurement mechanism according to claim 2, it is characterized in that, the insulating paper sample that the multistage that described insulating paper Aging simulation unit comprises the corresponding transformer difference sampling time limit respectively be arranged in parallel, described insulating paper sample all with the hot tie-in of temperature rise artifical resistance.
4. a kind of transformer heat ageing real time modelling measurement mechanism according to claim 3, it is characterized in that, the hop count of described insulating paper sample is 8-10.
5. a kind of transformer heat ageing real time modelling measurement mechanism according to claim 2, it is characterized in that, described temperature rise artifical resistance is adjustable resistance.
6. a kind of transformer heat ageing real time modelling measurement mechanism according to claim 1, it is characterized in that, described measurement mechanism also comprises Oil-temperature control unit, described Oil-temperature control unit comprises well heater, controller and the shell temperature sensor for gathering case temperature, the input end of described controller is connected with the output terminal of shell temperature sensor and transformer oil temperature sensor respectively, output terminal is connected with the input end of well heater, and the output terminal of described well heater is all connected with housing with the input end of shell temperature sensor.
7. a kind of transformer heat ageing real time modelling measurement mechanism according to claim 1, is characterized in that, described housing and the hot tie-in of transformer oil box top.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459412A (en) * | 2014-12-17 | 2015-03-25 | 国网上海市电力公司 | Transformer thermal ageing real-time simulation measurement device and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459412A (en) * | 2014-12-17 | 2015-03-25 | 国网上海市电力公司 | Transformer thermal ageing real-time simulation measurement device and application thereof |
| CN104459412B (en) * | 2014-12-17 | 2018-05-22 | 国网上海市电力公司 | A kind of transformer heat ageing real-time Simulation measuring device and its application |
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