CN109904841A - The digital non-ionizing energy loss method of oil-immersed transformer based on pressure variety - Google Patents
The digital non-ionizing energy loss method of oil-immersed transformer based on pressure variety Download PDFInfo
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- CN109904841A CN109904841A CN201910151880.5A CN201910151880A CN109904841A CN 109904841 A CN109904841 A CN 109904841A CN 201910151880 A CN201910151880 A CN 201910151880A CN 109904841 A CN109904841 A CN 109904841A
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Abstract
The invention discloses the digital non-ionizing energy loss methods of oil-immersed transformer based on pressure variety, firstly, setting starts threshold value P by the relay of protection oil-immersed transformer before protection powers onstWith protection act threshold value Pth；Then, signal pickup assembly acquires the pressure waveform on oil tank wall by pressure sensor in real time, obtains pressure instantaneous value P (t) at measuring point, and start threshold value P by comparing pressure instantaneous value P (t) and relaystNumerical values recited judges whether pressure switch starts；If pressure switch starts, the long pressure waveform of T=10ms data window is intercepted since Startup time, and calculate pressure variety Δ P；Finally, comparing pressure variety Δ P and protection act threshold value PthNumerical values recited, accurate recognition oil-immersed transformer internal state；The method of the present invention can correctly distinguish oil-immersed transformer internal fault and external disturbance, effectively avoid pressure protective device malfunction or tripping.
Description
Technical field
The invention belongs to transformer non-electricity protection technique fields, and in particular to the oil immersed type transformation based on pressure variety
The digital non-ionizing energy loss method of device.
Background technique
The protection component important as power transformer, protection, pressure protection, which are done with differential protection cooperation always, to be become
Depressor main protection uses.For the electrical quantity that compares protection, traditional gas, pressure protection more directly react event in transformer area
The non-electrical measure feature such as the oil flow surge occurred in barrier and pressure rise has higher sensitivity and reliability in principle.But
Be, it is different from the protection of transformer electrical quantity, for a long time non-ionizing energy loss and be not affected by industry concern and always in it is primary, fall
It is horizontal afterwards.With transformer electrical quantity protection compared with, the performance factor of non-ionizing energy loss is also at reduced levels, because of transformer outside
Portion's short-circuit impact causes main transformer grave gas false protection to trip, and pressure relief valve oil-spraying occurs repeatedly, and transports to power grid security
Row affects greatly.
Currently, in terms of the main reason for causing non-electric quantity protective value low has following four: first, as mechanical
The non-electrical movement accuracy of measurement of relay, measurement reflection fuel tank internal failure is insufficient, and its performance is by transformer station high-voltage side bus environment
And human factor influences greatly, while mechanical part abrasion aging also influences its sensitivity；Second, mechanical relay adaptive setting
Difficulty, the test result that field erected Buchholz relay movement definite value is provided according to last century the fifties former Soviet Union at present with
Operating experience is chosen, and correctness, reasonability have no way of determining；Third, transformer only installs one non electrical quantity relay of same type
And installation site is fixed, and there is very big randomness, the installation of fault point distance relay in fuel tank internal abort situation and intensity
To non electrical quantity actuating of relay performance, there are larger impacts for position；Finally, non electrical quantity fault signature before and after fuel tank internal failure
Change procedure is extremely complex, and to its deep study and analysis deficiency, while non-electricity protecting device is led by transformer manufacturers configuration
Causing relay protection worker attention degree deficiency is also major reason.
Summary of the invention
To solve the above-mentioned problems of the prior art, the object of the present invention is to provide the oil immersed types based on pressure variety
The digital non-ionizing energy loss method of transformer, can correct decision oil-immersed transformer internal fault and external disturbance, avoid protecting
Action element is protected in failure due to the improper tripping of setting value of pressure or malfunction.
In order to achieve the above objectives, the technical solution adopted by the present invention is that:
The digital non-ionizing energy loss method of oil-immersed transformer based on pressure variety, includes the following steps:
Step 1: before protection powers on, setting starts threshold value P by the relay of protection oil-immersed transformerstAnd protection act
Threshold value Pth；
Step 2: when oil-immersed transformer is run, signal pickup assembly is by pressure sensor to oil tank for oil immersion type transformer
Pressure waveform on wall is sampled, and pressure instantaneous value P (t) at measuring point is obtained；
Step 3: whether reaching relay starting threshold value P according to pressure instantaneous value P (t) at measuring pointstCome judge pressure after
Whether electric appliance starts；If starting, enters step 4, otherwise return step 2, continue to acquire pressure instantaneous value P (t) at measuring point；
Step 4: the pressure waveform of T=10ms is intercepted since pressure switch Startup time, when calculating the data window whole story
Pressure variety Δ P is carved, if pressure variety Δ P is greater than protection act threshold value Pth, it is internal to determine that oil-immersed transformer occurs
Failure, pressure protection movement and tripping circuit breaker；Otherwise, it is determined that being external disturbance, pressure protection is failure to actuate, return step 2 after
Pressure instantaneous value P (t) at continuous acquisition measuring point.
The protection starts threshold value PstShown in calculation formula such as formula (1):
Pst=Krel1Pnor.max (1)
In formula, Krel1For safety factor, value 1.2；Pnor.maxOil tank for oil immersion type transformer pressure is most when to operate normally
Big value.
The protection act threshold value PthShown in calculation formula such as formula (2):
Pth=Krel2Pum.max (2)
In formula, Krel2For safety factor, value 1.2；Pum.maxMost very much not for oil tank for oil immersion type transformer under external disturbance
Balance pressure value.
Shown in the pressure variety Δ P calculation formula such as formula (3):
Δ P=P (t0+10ms)-P(t0) (3)
In formula, t0For pressure switch Startup time, P (t0)、P(t0+ 10ms) it is the long initial time of data window and end respectively
The pressure instantaneous value at tail moment.
The method of the present invention is needed in oil-immersed transformer operation, and acquisition is by protection oil-immersed transformer pressure sensing in real time
The pressure value of device installation place starts threshold value P by comparing pressure instantaneous value P (t) at measuring point and relaystSize, sentence
It is disconnected whether to need to start pressure switch.If pressure switch starts, pressure variation delta P in 10ms data window is calculated, when
Pressure variety Δ P is greater than protection act threshold value PthWhen, it is possible to determine that internal fault occurs for oil-immersed transformer, correct to act
Prevent oil-immersed transformer on fire from explosion.
Detailed description of the invention
Fig. 1 is the flow chart for realizing the method for the present invention.
Fig. 2 is pressure waveform figure at fuel tank measuring point under 5% turn-to-turn fault of oil-immersed transformer A phase high-voltage winding.
Fig. 3 is pressure waveform figure at fuel tank measuring point under three-phase shortcircuit outside oil-immersed transformer.
Specific embodiment
The present invention is described in further details with reference to the accompanying drawings and examples.
As shown in Figure 1, the present invention is based on the digital non-ionizing energy loss methods of the oil-immersed transformer of pressure variety, including
Following steps:
Step 1: before protection powers on, setting starts threshold value P by the relay of protection oil-immersed transformerstAnd protection act
Threshold value Pth；
Step 2: when oil-immersed transformer is run, signal pickup assembly is by pressure sensor to oil tank for oil immersion type transformer
Pressure waveform on wall is sampled, and pressure instantaneous value P (t) at measuring point is obtained；
Step 3: whether reaching relay starting threshold value P according to pressure instantaneous value P (t) at measuring pointstCome judge pressure after
Whether electric appliance starts；If starting, enters step 4, otherwise return step 2, continue to acquire pressure instantaneous value P (t) at measuring point；
Step 4: the pressure waveform of T=10ms is intercepted since pressure switch Startup time, when calculating the data window whole story
Pressure variety Δ P is carved, if pressure variety Δ P is greater than protection act threshold value Pth, it is internal to determine that oil-immersed transformer occurs
Failure, pressure protection movement and tripping circuit breaker；Otherwise, it is determined that being external disturbance, pressure protection is failure to actuate, return step 2 after
Pressure instantaneous value P (t) at continuous acquisition measuring point.
Embodiment
Illustrate the feasibility of the present invention program by taking certain 220kV oil-immersed transformer as an example.As shown in Fig. 2, internal fault is sent out
After life in 10ms, oil tank for oil immersion type transformer internal pressure kept rises, and it is dynamic that the long interior pressure variation delta P of data window is greater than protection
Make threshold value Pth, it is determined as internal fault, pressure protection movement.As shown in figure 3, outside oil-immersed transformer when three-phase shortcircuit,
Tank internal pressure shows the positive and negative alternate oscillation that dominant frequency is 100Hz, and 10ms data window grows interior pressure variation delta P close to 0
Value is less than protection act threshold value Pth, it is determined as external disturbance, pressure protection is failure to actuate.Utilize discrimination method of the invention, energy
It is enough effectively to distinguish power transformer interior fault and external disturbance state, improve pressure protection Reliability of Microprocessor.
Claims (4)
1. the digital non-ionizing energy loss method of oil-immersed transformer based on pressure variety, which is characterized in that including walking as follows
It is rapid:
Step 1: before protection powers on, setting starts threshold value P by the relay of protection oil-immersed transformerstWith protection act threshold
Value Pth；
Step 2: when oil-immersed transformer is run, signal pickup assembly is by pressure sensor on oil tank for oil immersion type transformer wall
Pressure waveform sampled, obtain pressure instantaneous value P (t) at measuring point；
Step 3: whether reaching relay starting threshold value P according to pressure instantaneous value P (t) at measuring pointstTo judge pressure switch
Whether start；If starting, enters step 4, otherwise return step 2, continue to acquire pressure instantaneous value P (t) at measuring point；
Step 4: intercepting the pressure waveform of T=10ms since pressure switch Startup time, calculate data window whole story moment pressure
Power variation delta P, if pressure variety Δ P is greater than protection act threshold value Pth, determine that internal fault occurs for oil-immersed transformer,
Pressure protection movement and tripping circuit breaker；Otherwise, it is determined that being external disturbance, pressure protection is failure to actuate, and return step 2 continues to acquire
Pressure instantaneous value P (t) at measuring point.
2. the digital non-ionizing energy loss method of oil-immersed transformer as described in claim 1 based on pressure variety, special
Sign is that the protection starts threshold value PstShown in calculation formula such as formula (1):
Pst=Krel1Pnor.max (1)
In formula, Krel1For safety factor, value 1.2；Pnor.maxOil tank for oil immersion type transformer pressure is maximum when to operate normally
Value.
3. the digital non-ionizing energy loss method of oil-immersed transformer as described in claim 1 based on pressure variety, special
Sign is, the protection act threshold value PthShown in calculation formula such as formula (2):
Pth=Krel2Pum.max (2)
In formula, Krel2For safety factor, value 1.2；Pum.maxIt is maximum uneven for oil tank for oil immersion type transformer under external disturbance
Pressure value.
4. the digital non-ionizing energy loss method of oil-immersed transformer as described in claim 1 based on pressure variety, special
Sign is, shown in the pressure variety Δ P calculation formula such as formula (3):
Δ P=P (t0+10ms)-P(t0) (3)
In formula, t0For pressure switch Startup time, P (t0)、P(t0+ 10ms) when being the long initial time of data window and end respectively
The pressure instantaneous value at quarter.
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| CN201910151880.5A CN109904841A (en) | 2019-02-28 | 2019-02-28 | The digital non-ionizing energy loss method of oil-immersed transformer based on pressure variety |
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| CN201910151880.5A CN109904841A (en) | 2019-02-28 | 2019-02-28 | The digital non-ionizing energy loss method of oil-immersed transformer based on pressure variety |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110631762A (en) * | 2019-11-01 | 2019-12-31 | 国网江苏省电力有限公司电力科学研究院 | Method for determining internal pressure criterion for mutual inductor fault early warning |
| CN112928741A (en) * | 2021-02-08 | 2021-06-08 | 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 | Heavy gas protection locking method for tap switch based on oil pressure fluctuation of converter transformer |
| CN113571379A (en) * | 2021-07-27 | 2021-10-29 | 广东电网有限责任公司 | Oil pressure quick-acting relay for digital transformer and control method |
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| US20110153236A1 (en) * | 2008-04-14 | 2011-06-23 | Michel Montreuil | Electrical anomaly detection method and system |
| CN108539706A (en) * | 2018-05-17 | 2018-09-14 | 南京南瑞继保电气有限公司 | A kind of protective relaying device signal processing method |
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| US20110153236A1 (en) * | 2008-04-14 | 2011-06-23 | Michel Montreuil | Electrical anomaly detection method and system |
| CN108539706A (en) * | 2018-05-17 | 2018-09-14 | 南京南瑞继保电气有限公司 | A kind of protective relaying device signal processing method |
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| 闫晨光 等: "基于压力特征的变压器数字式保护研究", 《中国电机工程学报》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110631762A (en) * | 2019-11-01 | 2019-12-31 | 国网江苏省电力有限公司电力科学研究院 | Method for determining internal pressure criterion for mutual inductor fault early warning |
| CN110631762B (en) * | 2019-11-01 | 2021-06-15 | 国网江苏省电力有限公司电力科学研究院 | Method for determining internal pressure criterion for mutual inductor fault early warning |
| CN112928741A (en) * | 2021-02-08 | 2021-06-08 | 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 | Heavy gas protection locking method for tap switch based on oil pressure fluctuation of converter transformer |
| CN112928741B (en) * | 2021-02-08 | 2022-12-02 | 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 | Heavy gas protection locking method for tapping switch based on oil pressure fluctuation of converter transformer |
| CN113571379A (en) * | 2021-07-27 | 2021-10-29 | 广东电网有限责任公司 | Oil pressure quick-acting relay for digital transformer and control method |
| CN113571379B (en) * | 2021-07-27 | 2023-12-01 | 广东电网有限责任公司 | Oil pressure quick-acting relay for digital transformer and control method |
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