CN103091608A - Research and experiment platform for relationship between power transformer partial discharge and gas production rate and measuring method - Google Patents
Research and experiment platform for relationship between power transformer partial discharge and gas production rate and measuring method Download PDFInfo
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- CN103091608A CN103091608A CN2013100049422A CN201310004942A CN103091608A CN 103091608 A CN103091608 A CN 103091608A CN 2013100049422 A CN2013100049422 A CN 2013100049422A CN 201310004942 A CN201310004942 A CN 201310004942A CN 103091608 A CN103091608 A CN 103091608A
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Abstract
The invention belongs to the technical field of electric power equipment maintenance, and provides a research and experiment platform for relationship between power transformer partial discharge and gas production rate and a measuring method. An experiment platform partial discharge measuring system includes an experimental article (6) and the like. A gas collecting system includes a gas collection measuring cylinder (8). The experimental article (6) is connected with the gas collection measuring cylinder (8) through an air guide pipe. The experimental article (6) is a glass container provided with a needle plate discharge electrode. One end of the needle plate discharge electrode is fixed on the top of the container, and the other end of the needle plate discharge electrode is fixed at the bottom of the container. A round opening is formed in the top end of the container and enables generated gas to be conveniently led out. The measuring method includes the steps of confirming ground terminals of a transformer, a partial voltage capacitor and an experimental electrode are reliably connected to the ground, injecting transformer oil to the experimental article, controlling a power supply to carry out experiment repeatedly, calculating data, and carrying out partial discharge chart screenshot. Through simulation of actual running conditions of the transformer, the relationship between the partial discharge and the gas production rate inside the transformer which is in actual running can be obtained. The research and experiment platform and the measuring method can be used for predicting an approximate location of faults of the transformer in advance so as to save overhaul time of the transformer.
Description
Technical field
A kind of Partial Discharge in Power Transformer and gas production rate concern research experiment platform and measuring method thereof, belong to the electric power apparatus examination technical field.
Background technology
Modern power systems is increasingly sophisticated, and the requirement of power equipment operational reliability is improved constantly.Power transformer is as converting equipment important in electric system, and its running status will directly have influence on the safe operation of electric system.At present in electric system, the power equipment such as transformer adopts the prophylactic repair mode mostly; this system exists major defect; as keep in repair deficiency, maintenance is superfluous or blindly maintenance etc., this makes countries in the world every year costly and affected power supply reliability aspect maintenance of equipment.How the maintenance of reasonable arrangement power equipment is saved recondition expense, is reduced the cost of overhaul, and there is higher reliability in the system that guarantees simultaneously, is an important topic to the operations staff of system.The monitoring of gas yield can well be understood the size that in transformer oil, office puts in operating transformer being carried out oil, whether thereby learning to exist causes the office of Transformer Insulation Aging or fault to be put, and then the operation of transformer is improved appropriately, and can predict in advance the Position Approximate of transformer fault, thereby save the Repair of Transformer time.
Summary of the invention
Goal of the invention: for guaranteeing safe operation of power system, power industry is carried out regular power failure test, inspection and maintenance according to the regulation in power equipment preventive trial rules to power equipment always for a long time.This scheduled overhaul system undoubtedly in the insulation of electrical installation fault diagnosis, prevent that equipment failure from occuring, guaranteeing to play good effect aspect safe and reliable power supply.But it is required that scheduled overhaul is that the test period according to prerun rules defined expires, and ignore the actual state of insulation of electrical installation, and tool bears the character of much blindness and be mandatory, thereby may cause the excessive maintenance of equipment, wastes a large amount of man power and materials.Simultaneously, this excessive maintenance also might be careless because of when maintenance, perhaps causes new insulation hidden danger due to dismounting frequently.
Some equipment surpasses demand value because some reason makes gas content, can not conclude fault; Though some equipment lower than demand value, as the content rapid development, also should arouse attention.Gas production rate to existence, the order of severity and the development trend thereof of faults more directly and obviously can further be determined the character that has that it's too late of fault.
Just because of above reason, the gas flow that produces due to shelf depreciation for transformer inside monitor with the calculating of speed can effectively monitoring transformer in office's size of putting.So what of bubble of putting generation due to office in transformer can be used as in the assessment transformer insulation quality and differentiate the standard whether transformer has failure symptom.Transformer oil paper insulation shelf depreciation is the one of the main reasons that causes the interior Bubble formation of operating transformer and insulation ag(e)ing and destruction, can judge latency fault and the development of operating transformer inside by the Changing Pattern of timely understanding shelf depreciation generation gas.
The object of the invention is to improve a kind of Partial Discharge in Power Transformer and gas production rate and concern the research experiment platform.
A kind of Partial Discharge in Power Transformer and gas production rate concern the research experiment platform, and this experiment porch comprises Partial Discharge Measurement System and gas gathering system;
Described Partial Discharge Measurement System comprises AC-high-voltage power supply (1), electric voltage regulator (2), power frequency testing transformer (3), protective resistance (4), coupling capacitance (5), test product (6), measurement of partial discharge instrument (7); Described gas gathering system comprises gas collection measuring cylinder (8);
Electric voltage regulator (2) connects AC-high-voltage power supply (1) by wire, and power frequency testing transformer (3) is connected with electric voltage regulator (2) wire; Regulate the added voltage of test product by power frequency testing transformer (3), power frequency testing transformer is drawn wire and is connected with protective resistance (4), and protective resistance (4) prevents the excessive damage equipment of electric current; Protective resistance (4) is drawn wire, parallel coupled electric capacity (5) and test product (6); Coupling capacitance (5) is connected with measurement of partial discharge instrument (7) by wire again, and test product (6) is connected with gas collection measuring cylinder (8) by wireway, and gas collection measuring cylinder (8) is measured and produced gas volume;
Described test product is the glass container that the needle plate sparking electrode is housed, and needle plate sparking electrode one end is fixed on container top, and an end is fixed on container bottom; Container head has convenient derivation of a round mouth to produce gas.
The present invention studies the relation between transformer inner discharge intensity and Gas in Oil of Transformer precipitation rate, is mainly that small office puts whether can produce bubble in transformer, and if to find out bubble formation transformer oil gassing rate relevant with those factors.Accordingly, improve people and the understanding of transformer degassing property and proposition are improved the way of transformer degassing property.The principle of equivalence is adopted in experiment, use point discharge (point-Slab is simulated) to carry out, draw the equivalence between putting of strength of discharge and office according to the ICE standard and contact, by the be rivals in a contest relation of transformer gassing rate of the relation office of obtaining between discharge magnitude and gassing rate.
The industrial frequency experiment pressurized equipment mainly is comprised of power frequency high voltage experiment control platform and YDT-10/120 transformer, and wherein power frequency high voltage experiment control platform is used in the experiment Switching Power Supply, close a floodgate, and pressurization, step-down and separating brake.Transformer is the single-phase halo-free testing transformer of power frequency, and shelf depreciation is no more than 5pc under rated voltage, and power circuit connection layout of the present invention is seen Fig. 1.Fig. 1 is power circuit connection layout of the present invention.Wherein, AC-high-voltage power supply; The digital instrument for measuring partial discharge of LDS-6, T1---HY-AC20-1 type electric voltage regulator, T2---YDT-5/50 power frequency testing transformer, C---800PF coupling capacitance etc., Cx---test product.
In test, transformer moves under normal temperature, by Partial discharge detector's (pulsed current signal), shelf depreciation is detected.What the pulse current detection method detected is the voltage signal that detects the impedance two ends, due to detection mode exist uncertain, if discharge signal detected when not having testing apparatus, generation that can be more sure shelf depreciation.
The present invention also provides a kind of Partial Discharge in Power Transformer and gas production rate to concern measuring method, and the method step is:
(1) confirm transformer, dividing potential drop electric capacity and the reliable one point earth of experimental electrode earth terminal;
(2) injection transformer oil in the experiment test product, and will insert for the conduit pore from the side of measurement gas, after ground rod is removed from experimental apparatus, pressurize with control desk.At first add to the 5kv observe phenomena, determine the approximate range of the gas production rate of bubble.
(3) will control the power supply step-down and close, and after experimental apparatus is discharged, to the gas production rate record of reading.And office as to this puts figure and preserves sectional drawing.In order to carry out subsequent calculations.
(4) repeat experiment, experimental voltage transfers to respectively 10kv, 15kv, 20kv tests.Carry out data and calculate, the figure sectional drawing is put in office.
(5) data that experiment obtained are carried out Treatment Analysis, draw the discharge capacity of shelf depreciation, amplitude, a series of related datas such as energy and repetition rate; Like this, must be out high-volume with what relation of aerogenesis.
This experiment porch is by simulation real transformer running status, the relation of research shelf depreciation and transformer insulation oil gas production rate.Test by platform, can study in oil-filled transformer, whether small shelf depreciation can produce bubble, if the speed that can produce bubble produce bubble is the physical relationship that how much draws bubble speed and transformer partial discharge in transformer, and can apply to actual production process with actual combining, draw under running status, calculate according to Bubble formation speed the size that in transformer, office puts, extrapolate bubble and whether can gather at step-up side.
Beneficial effect of the present invention: can verify in the transformer of actual motion, partial discharge quantity is increased, within the identical duration, can produce more gas.The output of gas is amplified little being directly proportional to office, and partial discharge quantity is larger, and gas production rate is just more.
Description of drawings
Fig. 1 is power circuit connection layout of the present invention.Wherein, AC-high-voltage power supply; The digital instrument for measuring partial discharge of LDS-6, T1---HY-AC20-1 type electric voltage regulator, T2---YDT-5/50 power frequency testing transformer, C---800PF coupling capacitance etc., Cx---test product.
Fig. 2 is the gas collection principle schematic.
Fig. 3 is the test product structural representation.
Fig. 4 is structural drawing of the present invention.
Embodiment
Further illustrate the present invention below in conjunction with accompanying drawing.
Fig. 1 is the Partial Discharge Measurement System electrical block diagram.Fig. 2 is the gas collection principle schematic.Fig. 3 is test product structural representation of the present invention.Fig. 4 is structural drawing of the present invention.
A kind of Partial Discharge in Power Transformer and gas production rate concern the research experiment platform, and this experiment porch comprises Partial Discharge Measurement System and gas gathering system;
Described Partial Discharge Measurement System comprises AC-high-voltage power supply (1), electric voltage regulator (2), power frequency testing transformer (3), protective resistance (4), coupling capacitance (5), test product (6), measurement of partial discharge instrument (7); Described gas gathering system comprises gas collection measuring cylinder (8); Electric voltage regulator (2) connects AC-high-voltage power supply (1) by wire, and power frequency testing transformer (3) is connected with electric voltage regulator (2) wire; Regulate the added voltage of test product by power frequency testing transformer (3), power frequency testing transformer is drawn wire and is connected with protective resistance (4), and protective resistance (4) prevents the excessive damage equipment of electric current; Protective resistance (4) is drawn wire, parallel coupled electric capacity (5) and test product (6); Coupling capacitance (5) is connected with measurement of partial discharge instrument (7) by wire again, and test product (6) is connected with gas collection measuring cylinder (8) by wireway, and gas collection measuring cylinder (8) is measured and produced gas volume; Described test product is the glass container that the needle plate sparking electrode is housed, and needle plate sparking electrode one end is fixed on container top, and an end is fixed on container bottom; Container head has convenient derivation of a round mouth to produce gas.(test product structure such as Fig. 3)
A kind of Partial Discharge in Power Transformer and gas production rate concern measuring method, and the method step is:
1. confirmation transformer, dividing potential drop electric capacity and the reliable one point earth of experimental electrode earth terminal.
2. injection transformer oil in the experiment test product, and will insert for the conduit pore from the side of measurement gas, after ground rod is removed from experimental apparatus, pressurize with control desk.At first add to the 5kv observe phenomena, determine the approximate range of the gas production rate of bubble.
3. will control the power supply step-down and close, and after experimental apparatus is discharged, to the gas production rate record of reading.And office as to this puts figure and preserves sectional drawing.In order to carry out subsequent calculations.
4. repeat experiment, experimental voltage transfers to respectively 10kv, 15kv, 20kv tests.Carry out data and calculate, the figure sectional drawing is put in office.
5. the data that experiment obtained are carried out Treatment Analysis, draw the discharge capacity of shelf depreciation, amplitude, a series of related datas such as energy and repetition rate.Out high-volume with what relation of aerogenesis.
Test at 5kv, 10kv, 15kv, 20kv by experiment porch equipment of the present invention and method, carrying out data calculates, the data that experiment obtains are carried out Treatment Analysis, obtaining that certain Partial Discharge in Power Transformer and gas production rate close is in transformer oil, discharge capacity is larger, and the discharge repetition rate is also larger.Transformer oil gas production rate in same time is also just more.In addition, under identical electric pressure and discharge capacity, the speed and the time that produce gas are linear, and along with the increase of time, gas yield is more and more.This phenomenon also can be aggravated discharge in transformer oil simultaneously.Discharge can produce gas for a long time, and gas yield increases in time, finally can cause transformer fault.The present invention draws in the actual motion transformer by the ruuning situation of simulation real transformer, the relation of the inner shelf depreciation of transformer and gas production rate.Thereby can learn whether to exist according to gas production rate and can cause Transformer Insulation Aging or the shelf depreciation of fault, and then the operation of transformer is improved appropriately, and can predict in advance the Position Approximate of transformer fault, save the Repair of Transformer time.
Claims (2)
1. a Partial Discharge in Power Transformer and gas production rate concern the research experiment platform, it is characterized in that, this experiment porch comprises Partial Discharge Measurement System and gas gathering system;
Described Partial Discharge Measurement System comprises AC-high-voltage power supply (1), electric voltage regulator (2), power frequency testing transformer (3), protective resistance (4), coupling capacitance (5), test product (6), measurement of partial discharge instrument (7); Described gas gathering system contains gas collection measuring cylinder (8);
Electric voltage regulator (2) connects AC-high-voltage power supply (1) by wire, and power frequency testing transformer (3) is connected with electric voltage regulator (2) wire; Regulate the added voltage of test product by power frequency testing transformer (3), power frequency testing transformer is drawn wire and is connected with protective resistance (4), and protective resistance (4) prevents the excessive damage equipment of electric current; Protective resistance (4) is drawn wire, parallel coupled electric capacity (5) and test product (6); Coupling capacitance (5) is connected with measurement of partial discharge instrument (7) by wire again, and test product (6) is connected with gas collection measuring cylinder (8) by wireway, and gas collection measuring cylinder (8) is measured and produced gas volume;
Described test product is the glass container that the needle plate sparking electrode is housed, and needle plate sparking electrode one end is fixed on container top, and an end is fixed on container bottom; Container head has convenient derivation of a round mouth to produce gas.
2. a Partial Discharge in Power Transformer and gas production rate concern measuring method, it is characterized in that, the method step is:
(1) confirm transformer, dividing potential drop electric capacity and experimental electrode earth terminal reliable ground;
(2) injection transformer oil in the experiment test product, and will insert for the conduit pore from the side of measurement gas, after ground rod is removed from experimental apparatus, pressurize with control desk; At first add to the 5kv observe phenomena, determine the approximate range of the gas production rate of bubble;
(3) will control the power supply step-down and close, and after experimental apparatus is discharged, to the gas production rate record of reading; And office as to this puts figure and preserves sectional drawing, in order to carry out subsequent calculations;
(4) repeat experiment, experimental voltage transfers to respectively 10kv, 15kv, 20kv tests; Carry out data and calculate, the figure sectional drawing is put in office;
(5) data that experiment obtained are carried out Treatment Analysis, draw the discharge capacity of shelf depreciation, amplitude, a series of related datas such as energy and repetition rate; Like this, must be out high-volume with what relation of aerogenesis.
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Cited By (5)
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| CN103941128A (en) * | 2014-05-06 | 2014-07-23 | 国家电网公司 | Transformer electrical fault simulation device |
| CN104020397A (en) * | 2014-06-03 | 2014-09-03 | 华北电力大学 | Method for simulating internal operating environment of converter transformer |
| CN107561425A (en) * | 2017-10-31 | 2018-01-09 | 国网重庆市电力公司电力科学研究院 | Characteristics of Partial Discharge recognition methods based on sulfur hexafluoride gas resolution characteristic |
| CN108254667A (en) * | 2016-12-27 | 2018-07-06 | 三菱电机株式会社 | Evaluating apparatus and evaluation method |
| CN113253067A (en) * | 2021-05-12 | 2021-08-13 | 国网安徽省电力有限公司电力科学研究院 | Method and system for correcting gas production rate of transformer insulating oil partial discharge simulation test |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941128A (en) * | 2014-05-06 | 2014-07-23 | 国家电网公司 | Transformer electrical fault simulation device |
| CN104020397A (en) * | 2014-06-03 | 2014-09-03 | 华北电力大学 | Method for simulating internal operating environment of converter transformer |
| CN108254667A (en) * | 2016-12-27 | 2018-07-06 | 三菱电机株式会社 | Evaluating apparatus and evaluation method |
| CN107561425A (en) * | 2017-10-31 | 2018-01-09 | 国网重庆市电力公司电力科学研究院 | Characteristics of Partial Discharge recognition methods based on sulfur hexafluoride gas resolution characteristic |
| CN113253067A (en) * | 2021-05-12 | 2021-08-13 | 国网安徽省电力有限公司电力科学研究院 | Method and system for correcting gas production rate of transformer insulating oil partial discharge simulation test |
| CN113253067B (en) * | 2021-05-12 | 2022-08-12 | 国网安徽省电力有限公司电力科学研究院 | Method and system for correcting gas production rate of transformer insulating oil partial discharge simulation test |
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Owner name: NORTH CHINA POWER SCIENCE RESEARCH INST., CO., LTD Free format text: FORMER OWNER: NORTH CHINA POWER SCIENCE RESEARCH INST., CO., LTD. Effective date: 20130415 |
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