CN102384969B

CN102384969B - Evaluation method on transformer oil

Info

Publication number: CN102384969B
Application number: CN201010273331.4A
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: 2014-11-26
Anticipated expiration: 2030-09-03
Also published as: CN102384969A

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 using in power transmission system, mainly plays insulation and cooling heat dissipation effect in the oil-filled electric equipments such as transformer, reactor, mutual inductor, switch.Because electrical equipment is in the defeated change process of electric power, transformer oil can be subject to the impact of the factors such as oxygen, temperature, electric field, metal, insulating material and be oxidized, the chemical reaction such as cracking, generate the oxides such as a large amount of superoxide and alcohol, aldehyde, ketone, acid, generate again the insolubless such as greasy filth through condensation reaction, cause oil quality deterioration, reduce serviceable life.Therefore, transformer oil antioxygenic property is the important quality index of transformer oil.

There are at present two kinds of oxidation test methods to evaluate transformer oil antioxygenic property.The one, the oxidation test method specifying in transformer oil standard GB/T 2536-90, the 2nd, in transformer oil international standard IEC60296-2003, adopt transformer oil oxidation test method.Their test principle is all to utilize copper wire to investigate greasy filth that oil product produces and the situation of acid number as catalyzer, under uniform temperature (as 110～120 DEG C), certain gas (air or oxygen) atmosphere.Because test method has all just been simulated transformer oil in heating and the situation of oil product aged deterioration under using copper wire as catalyzer situation, still have different with executing alive situation in actual motion, therefore evaluation result has certain limitation.

Summary of the invention

Technical matters to be solved by this invention be prior art exist can not provide meet transformer oil actual application environment for evaluating the problem of method of transformer oil antioxygenic property, a kind of evaluation method of new transformer oil is provided.The method is the actual application environment of analogue transformer oil completely, reflects the antioxygenic property of transformer oil comprehensively.

For solving the problems of the technologies described above, the technical solution used in the present invention is as follows: a kind of evaluation method of transformer oil, transformer exposed, that have load is set in transformer oil, and transformer oil is fully contacted with transformer; Wherein, the test condition of transformer oil is: 60～200 DEG C 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 technique scheme, the test condition preferable range of transformer oil is: 60～150 DEG C of temperature, oxygen flow 20～80 ml/min, 2500～18000 volts of voltages; More preferably scope is: 70～120 DEG C 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.

Adopt after the inventive method the acid number of testing experiment transformer oil.In the time that acid number is deteriorated to the 0.1 milligram of KOH/ gram of limit value index specifying in GB/T14542 standard, record test period, and using the index of this time as the antioxygenic property of evaluation test transformer oil.

The inventive method by arranging transformer exposed, that have load in transformer oil, transformer oil is directly fully contacted with transformer, simulated truly transformer oil is subject to the multifactor interaction of oxygen, temperature, electric field and metallic catalyst and affects and cause the working condition of oil quality deterioration in actual motion environment, reflect exactly the antioxygenic property of transformer oil, obtained good technique effect.

Below by embodiment, the present invention is further elaborated.

Embodiment

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

Table 1

Can find out from the performance data of table 1, each testing transformer oil all has good electric property.But 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, C product is generally used in small low-voltage transformer, and D product can be in middle high-pressure transformer.Therefore, the comprehensive many-sided situation analysis of above-mentioned several samples, can be divided three classes by quality-ordered:

I class: there is better performance transformer oil, A2, A3 oil sample

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

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

[embodiment 1]

Transformer exposed, that have load is set in transformer oil A1, transformer oil is fully contacted with transformer; Wherein, the test condition of transformer oil is: 85 DEG C 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, in the time that acid number is 0.1 milligram KOH/ gram, recording test period is 2720 hours, and with the antioxygenic property of this Time evaluation testing transformer oil.

[embodiment 2]

With [embodiment 1], evaluate the antioxygenic property of A1 oil sample.Just the test condition of transformer oil is: 98 DEG C 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, in the time that acid number is 0.1 milligram KOH/ gram, recording test period is 1560 hours, and with the antioxygenic property of this Time evaluation testing transformer oil.

[embodiment 3～8]

With [embodiment 1], evaluate the antioxygenic property of A1, A2, A3, B, D and C oil sample.Just the test condition of transformer oil is: 95 DEG C 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, in the time that acid number is 0.1 milligram KOH/ gram, records test period.Specifically in table 2.

Table 2

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

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

[comparative example]

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

Table 3

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

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

Claims

1. an evaluation method for transformer oil arranges transformer exposed, that have load in transformer oil, and transformer oil is fully contacted with transformer; The acid number of testing experiment transformer oil; In the time that acid number is deteriorated to the 0.1 milligram of KOH/ gram of limit value index specifying in GB/T14542 standard, record test period, and using the index of this time as the antioxygenic property of evaluation test transformer oil; Wherein, the test condition of transformer oil is: 60～200 DEG C 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. the evaluation method of transformer oil according to claim 1, is characterized in that the test condition of transformer oil is: 60～150 DEG C of temperature, oxygen flow 20～80 ml/min, 2500～18000 volts of voltages.

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

4. the evaluation method of transformer oil according to claim 1, 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. the evaluation method of transformer oil according to claim 4, 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.