CN109742729A - The digital protection method of oil-immersed transformer based on oil stream measure feature - Google Patents
The digital protection method of oil-immersed transformer based on oil stream measure feature Download PDFInfo
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- CN109742729A CN109742729A CN201910153085.XA CN201910153085A CN109742729A CN 109742729 A CN109742729 A CN 109742729A CN 201910153085 A CN201910153085 A CN 201910153085A CN 109742729 A CN109742729 A CN 109742729A
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- immersed transformer
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Abstract
Velocity information is passed to digital Buchholz relay firstly, the flow sensor for being mounted on oil-immersed transformer connecting tube carries out the oil stream speed in connecting tube to continue real-time measurement by the digital protection method of oil-immersed transformer based on oil stream measure feature；When speed is up to entry condition is met, digital Buchholz relay calculates the flow in connecting tube in a calculating cycle T；Flow value will be calculated compared with setting valve carries out size；Determine whether protection acts according to comparison result；The method of the present invention can oil-immersed transformer occur internal fault when effectively start, protect action message；And malfunction when preventing oil-immersed transformer from external fault occurs.
Description
Technical field
The present invention relates to the protection technique fields of oil-immersed transformer, and in particular to a kind of oil immersion based on oil stream measure feature
The digital protection method of formula transformer.
Background technique
Transformer protection has just become the mainstream non-ionizing energy loss mode of transformer since the twenties in last century,
As the supplement of transformer electric quantity protective, mainly to cope with inside transformer short trouble the case where.Compared to transformer
For electrical quantity protection, the non-ionizing energy loss that reaction failure gas generates more fully, directly reacts the operation shape of protected object
State, and there is unique advantage in terms of sensitivity etc..
The Buchholz relay of original oil-immersed transformer is mechanically to protect, the protection based on oil stream speed size information
Principle is that the flowing of oil stream can be generated under internal fault condition, impacts the baffle before lower float, then flapper, under
The dry-reed contact in face is closed, then circuit breaker trip.But due to the enough attention of long-term lacking and research, at present in system
That there are reliabilities is low for the Buchholz relay used, takes threshold value by rule of thumb, the defects of mechanical structure and quick-action are insufficient, watt
This false protection, tripping accident happen occasionally.According to statistics, China has occurred and that several 500kV transformer gas are protected in recent years
Protect the accident because of external area error malfunction tripping；Furthermore due to traditional Buchholz relay from perceive flow velocity to trigger protection into
Row tripping whole process also has that delay is too long, is possible to the problem of missing the optimal trip time, once inside transformer occur it is tight
The turn-to-turn short circuit or inside pipe casing arc short circuit failure, fault electric arc energy of weight sharply discharge, and are mounted at conservator connecting tube
Buchholz relay is generally difficult to experience the variation of oil flow surge in time, and traditional Buchholz relay has little time to act, and failure at this time
Nearby fuel tank tank wall has occurred and that plastic deformation, cracking or even explodes point.
Summary of the invention
To solve above-mentioned problems of the prior art, the purpose of the present invention is to provide one kind can be with fast reaction oil
The digital protecting method of oil stream measure feature in immersion transformer connecting tube is the oil-immersed transformer based on oil stream measure feature
Digital protection method, can in rapid detection oil-immersed transformer connecting tube oil stream uninterrupted, export number letter
Breath is compared with setting valve, quick judgement is made, to quickly isolate failure.
In order to reach above-described purpose, the technical scheme adopted by the invention is:
The digital protection method of oil-immersed transformer based on oil stream measure feature, comprising the following steps:
Step 1: digital flow sensor being installed in oil-immersed transformer connecting tube, oil stream speed in connecting tube is carried out
Continue real-time measurement, measures a speed values v at interval of Δ toil, and by oil stream velocity information be transmitted to digital gas after
Electric appliance；
Step 2: digital Buchholz relay judges the velocity information received, when the speed values received are big
In digital Buchholz relay initiation value vopenWhen, namely meet voil≥vopen, digital Buchholz relay starting oil flowmeter
Program is calculated, by formulaCalculate oil stream amount, in formula, A is connecting tube cross-sectional area, voilIt is oily in connecting tube
Velocity magnitude is flowed, Q is oil stream amount, and T is oil stream amount calculating cycle, and T is the integral multiple of Δ t, and Δ t is to test the speed the sampling interval；
Step 3: by the oil stream amount Q being calculated and the oil stream amount setting valve Q setsetIt is compared；
Step 4: if Q >=Qset, then it is judged as oil-immersed transformer internal fault, protection act, circuit breaker trip；Otherwise,
Protection is failure to actuate.
Oil stream amount setting valve QsetSetting to avoid external fault when connecting tube oil stream in T may by maximum
Flow is principle.
The method of the present invention needs digital Buchholz relay after starting flow rate calculation program, calculates in connecting tube and calculates
Oil stream amount Q size in cycle T, and be compared with setting valve.When due to the setting of setting valve being to avoid external fault
Possible maximum stream flow be principle so the criterion flow that once measures is greater than setting valve is judged as oil immersed type transformation
Device internal fault, exports judging result, and tripping circuit breaker carries out reliably protecting to the internal fault of oil-immersed transformer, effectively
Malfunction when preventing oil-immersed transformer external area error, effectively improves protection of the Buchholz relay to oil-immersed transformer internal fault
Reliability, and have good quick-action.
Detailed description of the invention
Fig. 1 is the flow chart for realizing the method for the present invention.
Fig. 2 is to be suitable for the invention digital flow sensor schematic view of the mounting position.
Fig. 3 is embodiment of the method explanatory diagram of the invention.
Specific embodiment
Below with reference to attached drawing of the invention, invention is further described in detail, is become with the oil immersed type in embodiment attached drawing
Depressor T1For illustrate method of the invention.
As shown in Figure 1, the digital protection method of oil-immersed transformer based on oil stream measure feature, including following step
It is rapid:
Step 1: as shown in Fig. 2, digital flow sensor is installed in oil-immersed transformer connecting tube, to oily in connecting tube
Flow velocity degree carries out continuing real-time measurement, measures a speed values v at interval of Δ toil, and oil stream velocity information is transmitted to number
Word formula Buchholz relay；
Step 2: digital Buchholz relay judges the velocity information received, when the speed values received are big
In digital Buchholz relay initiation value vopenWhen, namely meet voil≥vopen, digital Buchholz relay starting oil flowmeter
Program is calculated, by formulaCalculate oil stream amount, in formula, A is connecting tube cross-sectional area, voilIt is oily in connecting tube
Velocity magnitude is flowed, Q is oil stream amount, and T is oil stream amount calculating cycle, and T is the integral multiple of Δ t, and Δ t is to test the speed the sampling interval；
Step 3: by the oil stream amount Q being calculated and the oil stream amount setting valve Q setsetIt is compared；
Step 4: if Q >=Qset, then it is judged as oil-immersed transformer internal fault, protection act, circuit breaker trip；Otherwise,
Protection is failure to actuate.
The oil stream amount setting valve Q of digital protectionsetIt can in flow rate calculation cycle T when for transformer external fault
The K of maximum stream flow caused by energyrelTimes, KrelFor safety factor, generally it is slightly larger than 1.
Embodiment
As shown in figure 3, being a radial power grid, with transformer T1For illustrate method of the invention.
The digital protection method of oil-immersed transformer based on oil stream measure feature, comprising the following steps:
Step 1: in oil-immersed transformer T1Connecting tube installs digital flow sensor, to oil stream speed in connecting tube into
Row continues real-time measurement, measures a speed values v at interval of Δ toil, and oil stream velocity information is transmitted to digital gas
Relay；
Step 2: digital Buchholz relay judges the velocity information received, when the speed values received are big
In digital Buchholz relay initiation value vopenWhen, namely meet voil≥vopen, digital Buchholz relay starting oil flowmeter
Program is calculated, by formulaTo calculate oil stream amount；
Step 3: by the oil stream amount Q being calculated and the oil stream amount setting valve Q setsetIt is compared；
Step 4: if Q >=Qset, then it is judged as oil-immersed transformer T1Internal fault, protection act, circuit breaker trip；It is no
Then, protection is failure to actuate.
The oil stream amount setting valve Q of digital protectionsetFor transformer T1In the flow rate calculation period when generation external fault
The K for the maximum stream flow that may cause in TrelTimes, KrelFor safety factor, generally it is slightly larger than 1.
Inside and outside event can effectively be distinguished for oil-immersed power transformer using previously described protection scheme
Barrier.When outside line breaks down, malfunction can be effectively prevented；It, can be with action message when power transformer interior fault.
Claims (1)
1. the digital protection method of oil-immersed transformer based on oil stream measure feature, it is characterised in that: the following steps are included:
Step 1: digital flow sensor being installed in oil-immersed transformer connecting tube, oil stream speed in connecting tube is continued
Real-time measurement measures a speed values v at interval of Δ toil, and oil stream velocity information is transmitted to digital Buchholz relay；
Step 2: digital Buchholz relay judges the velocity information received, when the speed values received are greater than number
Word formula Buchholz relay initiation value vopenWhen, namely meet voil≥vopen, digital Buchholz relay starting oil stream amount calculating journey
Sequence, by formulaCalculate oil stream amount, in formula, A is connecting tube cross-sectional area, voilFor oil flow rate in connecting tube
Size is spent, Q is oil stream amount, and T is oil stream amount calculating cycle, and T is the integral multiple of Δ t, and Δ t is to test the speed the sampling interval；
Step 3: by the oil stream amount Q being calculated and the oil stream amount setting valve Q setsetIt is compared, oil stream amount setting valve
QsetThe oil stream of connecting tube when setting to avoid external fault in T may by maximum stream flow as principle；
Step 4: if Q >=Qset, then it is judged as oil-immersed transformer internal fault, protection act, circuit breaker trip；Otherwise, it protects
It is failure to actuate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910153085.XA CN109742729A (en) | 2019-02-28 | 2019-02-28 | The digital protection method of oil-immersed transformer based on oil stream measure feature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910153085.XA CN109742729A (en) | 2019-02-28 | 2019-02-28 | The digital protection method of oil-immersed transformer based on oil stream measure feature |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109742729A true CN109742729A (en) | 2019-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910153085.XA Pending CN109742729A (en) | 2019-02-28 | 2019-02-28 | The digital protection method of oil-immersed transformer based on oil stream measure feature |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111446069A (en) * | 2020-03-24 | 2020-07-24 | 广东电网有限责任公司电力科学研究院 | Protection method, system, device and equipment for oil-immersed transformer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569481A (en) * | 2014-12-03 | 2015-04-29 | 国网河南省电力公司电力科学研究院 | Oil flow speed acquiring system for gas relay, and heavy-gas setting-value verifying method |
| CN105301281A (en) * | 2014-05-28 | 2016-02-03 | 国网山西省电力公司电力科学研究院 | Monitoring method and device for flowing speed of transformer oil flow |
| US20160072280A1 (en) * | 2014-09-08 | 2016-03-10 | Lee Joseph Bourgeois, Jr. | System and control method to improve the reliability and range of mineral insulated electrical cables |
-
2019
- 2019-02-28 CN CN201910153085.XA patent/CN109742729A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301281A (en) * | 2014-05-28 | 2016-02-03 | 国网山西省电力公司电力科学研究院 | Monitoring method and device for flowing speed of transformer oil flow |
| US20160072280A1 (en) * | 2014-09-08 | 2016-03-10 | Lee Joseph Bourgeois, Jr. | System and control method to improve the reliability and range of mineral insulated electrical cables |
| CN104569481A (en) * | 2014-12-03 | 2015-04-29 | 国网河南省电力公司电力科学研究院 | Oil flow speed acquiring system for gas relay, and heavy-gas setting-value verifying method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111446069A (en) * | 2020-03-24 | 2020-07-24 | 广东电网有限责任公司电力科学研究院 | Protection method, system, device and equipment for oil-immersed transformer |
| CN111446069B (en) * | 2020-03-24 | 2021-03-12 | 广东电网有限责任公司电力科学研究院 | Protection method, system, device and equipment for oil-immersed transformer |
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Application publication date: 20190510 |
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