CN102384969A

CN102384969A - Evaluation method on transformer oil

Info

Publication number: CN102384969A
Application number: CN2010102733314A
Authority: CN
Inventors: 俞巧珍; 傅继瑜; 吕文继; 何晓瑛; 张志辉
Original assignee: China Petroleum and Chemical Corp
Current assignee: China Petroleum and Chemical Corp
Priority date: 2010-09-03
Filing date: 2010-09-03
Publication date: 2012-03-21
Anticipated expiration: 2030-09-03
Also published as: CN102384969B

Abstract

The invention relates to an evaluation method on transformer oil, mainly solving the problem that the existing technology can not provide an evaluation method which conforms to practical application environment of transformer oil on antioxidation performance of transformer oil. The invention arranges an exposed and loaded transformer in the transformer such that the transformer oil and the transformer can fully contact with each other, wherein the test conditions of the transformer oil are as follows: the temperature is 60-200 degrees centigrade; the oxygen flow is 20-100 ml/min; the voltage is 1, 000-20, 000 V; the test conditions of the transformer are as follows: the primary voltage is 200-500 V; the secondary voltage is 100-400 V; the load current is 1-10 A. The technical solution of the invention well solves the problem, and can be used in evaluation of antioxidation performance of transformer oil.

Description

The evaluation method of transformer oil

Technical field

The present invention relates to a kind of evaluation method of transformer oil.

Background technology

Transformer oil is one of stock that uses in the power transmission system, in oil-filled electrical equipments such as transformer, reactor, mutual inductor, switch, mainly plays insulation and cooling heat dissipation effect.Because electrical equipment is in the defeated change process of electric power; Transformer oil can receive the influence of factors such as oxygen, temperature, electric field, metal, insulating material and chemical reactions such as oxidation, cracking take place; Generate oxides such as a large amount of superoxide and alcohol, aldehyde, ketone, acid; Generate insolubless such as greasy filth again through condensation reaction, cause oil quality deterioration, reduce serviceable life.Therefore, the transformer oil antioxygenic property is the important quality index of transformer oil.

There are two kinds of oxidation test methods to estimate the transformer oil antioxygenic property at present.The one, the oxidation test method of stipulating among the transformer oil standard GB 2536-90, the 2nd, adopt transformer oil oxidation test method among the transformer oil international standard IEC60296-2003.Their test principle all is to utilize copper wire as catalyzer, the greasy filth of investigation oil product generation under uniform temperature (as 110～120 ℃), certain gas (air or oxygen) atmosphere and the situation of acid number.Since test method all just simulated transformer oil heating and with copper wire as the catalyzer situation under the situation of oil product aged deterioration, still have certain difference with applying voltage condition in the actual motion, so evaluation result has certain limitation.

Summary of the invention

Technical matters to be solved by this invention is that prior art exists the problem of method that is used to estimate the transformer oil antioxygenic property that meets the transformer oil actual application environment can not be provided, and a kind of evaluation method of new transformer oil is provided.This method is the actual application environment of analogue transformer oil fully, reflects the antioxygenic property of transformer oil comprehensively.

For solving the problems of the technologies described above, the technical scheme that the present invention adopts is following: a kind of evaluation method of transformer oil, transformer exposed, that load is arranged is set in transformer oil, and transformer oil is fully contacted with transformer; Wherein, the test condition of transformer oil is: 60～200 ℃ of temperature, oxygen flow 20～100 ml/min, 1000～20000 volts of voltages; The test condition of transformer is: 200～500 volts of primary voltages, 100～400 volts of secondary voltages, 1～10 ampere of load current.

In the technique scheme, the test condition preferable range of transformer oil is: 60～150 ℃ of temperature, oxygen flow 20～80 ml/min, 2500～18000 volts of voltages; More preferably scope is: 70～120 ℃ of temperature, oxygen flow 20～60 ml/min, 5000～12000 volts of voltages.The test condition preferable range of transformer is: 250～450 volts of primary voltages, 100～350 volts of secondary voltages, 2～8 amperes of load currents; More preferably scope is: 250～400 volts of primary voltages, 150～300 volts of secondary voltages, 2～6 amperes of load currents.

After adopting the inventive method, the acid number of testing experiment transformer oil.When acid number corrupts to 0.1 milligram of KOH/ gram limit value index of stipulating in the GB/T14542 standard, the record test period, and should the time as the index of the antioxygenic property of evaluation test transformer oil.

The inventive method is through being provided with transformer exposed, that load is arranged in transformer oil; Transformer oil is directly fully contacted with transformer; Having simulated transformer oil truly receives the multifactor interaction of oxygen, temperature, electric field and metallic catalyst and influences and cause the working condition of oil quality deterioration in the actual motion environment; Reflect the antioxygenic property of transformer oil exactly, obtained better technical effect.

Through embodiment the present invention is done further elaboration below.

Embodiment

Testing transformer oil A1, A2, A3, B, C and D performance evaluation before the test.Specifically see table 1.

Table 1

Can find out that from the performance data of table 1 each testing transformer oil all has electric property preferably.But see that from oxidation stability the oxidation susceptibility of A1, A2 and A3 oil sample is better, and B and D oil sample oxidation susceptibility are taken second place, and the oxidation susceptibility of C sample is the poorest.According to practical situations, the C product generally is used for the small low-voltage transformer, and the D product can be used for middle and high pressure transformer.Therefore, the comprehensive many-sided situation analysis of above-mentioned several samples can be divided three classes it by quality-ordered:

I class: have better performance transformer oil, A2, A3 oil sample

The II class has the superperformance transformer oil, A1, B, D oil sample

III class: poor-performing transformer oil, C oil sample

[embodiment 1]

Transformer exposed, that load is arranged is set in transformer oil A1, transformer oil is fully contacted with transformer; Wherein, the test condition of transformer oil is: 85 ℃ of temperature, oxygen flow 25 ml/min, 6000 volts of voltages; The test condition of transformer is: 300 volts of primary voltages, 200 volts of secondary voltages, 2.5 amperes of load currents.

The acid number of testing experiment transformer oil, when acid number was 0.1 milligram of KOH/ gram, the record test period was 2720 hours, and with the antioxygenic property of this time evaluation test transformer oil.

[embodiment 2]

With [embodiment 1], estimate the antioxygenic property of A1 oil sample.Just the test condition of transformer oil is: 98 ℃ of temperature, oxygen flow 40 ml/min, 9000 volts of voltages; The test condition of transformer is: 380 volts of primary voltages, 250 volts of secondary voltages, 5 amperes of load currents.

The acid number of testing experiment transformer oil, when acid number was 0.1 milligram of KOH/ gram, the record test period was 1560 hours, and with the antioxygenic property of this time evaluation test transformer oil.

[embodiment 3～8]

With [embodiment 1], estimate the antioxygenic property of A1, A2, A3, B, D and C oil sample.Just the test condition of transformer oil is: 95 ℃ of temperature, oxygen flow 40 ml/min, 8100 volts of voltages; The test condition of transformer is: 330 volts of primary voltages, 220 volts of secondary voltages, 4.5 amperes of load currents.

The acid number of testing experiment transformer oil, when acid number is 0.1 milligram of KOH/ gram, the record test period.Specifically see table 2.

Table 2

Oil sample	A1	A2	A3	B	C	D
							Test duration, hour	1994	3143	3270	1725	687	2147

Can find out from table 2,, to test oil sample performance superior and inferior evaluating be in proper order: A3, A2, D, A1, B, C according to the test duration.The test evaluation result fits like a glove with the performance evaluation and the practical situations of test appearance.That is: A2, A3 oil sample are the I class, have better performance transformer oil; A1, B, D oil sample are the II class, have the superperformance transformer oil, the C oil sample is the III class, the poor-performing transformer oil.Draw thus, the present invention has good differentiation property to the transformer oil evaluation of different qualities, and the result is correct.

[comparative example]

Use prior art IEC61125 oxidation test method: utilize copper wire as catalyzer, under 120 ℃ of temperature, air mass flow 2.5 ml/min, 500 hours condition of test period, investigate the antioxygenic property of A1, A2, A3 oil sample.The acid number testing result of test back oil sample is seen table 3.

Table 3

Oil sample	The IEC60296-2003 index	A1	A2	A3
					Total acid number after the oxidation, milligram KOH/ gram	?≯1.2	0.0845	0.0422	0.0478

Can find out that from table 3 result data the antioxygenic property that A1, A2, A3 are showed in this test does not have evident difference, this and practical situations are not inconsistent.Transformer oil evaluation method of the present invention then can correctly be estimated the antioxygenic property of transformer oil, and the transformer oil evaluation of different qualities is had good differentiation property.

Claims

1. the evaluation method of a transformer oil is provided with transformer exposed, that load is arranged in transformer oil, and transformer oil is fully contacted with transformer; Wherein, the test condition of transformer oil is: 60～200 ℃ of temperature, oxygen flow 20～100 ml/min, 1000～20000 volts of voltages; The test condition of transformer is: 200～500 volts of primary voltages, 100～400 volts of secondary voltages, 1～10 ampere of load current.

2. according to the evaluation method of the said transformer oil of claim 1, it is characterized in that the test condition of transformer oil is: 60～150 ℃ of temperature, oxygen flow 20～80 ml/min, 2500～18000 volts of voltages.

3. according to the evaluation method of the said transformer oil of claim 2, it is characterized in that the test condition of transformer oil is: 70～120 ℃ of temperature, oxygen flow 20～60 ml/min, 5000～12000 volts of voltages.

4. according to the evaluation method of the said transformer oil of claim 1, it is characterized in that the test condition of transformer is: 250～450 volts of primary voltages, 100～350 volts of secondary voltages, 2～8 amperes of load currents.

5. according to the evaluation method of the said transformer oil of claim 4, it is characterized in that the test condition of transformer is: 250～400 volts of primary voltages, 150～300 volts of secondary voltages, 2～6 amperes of load currents.