CN207502554U - A kind of transient state oil stream velocity measuring device during transformer short-circuit impact - Google Patents
A kind of transient state oil stream velocity measuring device during transformer short-circuit impact Download PDFInfo
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- CN207502554U CN207502554U CN201721688561.0U CN201721688561U CN207502554U CN 207502554 U CN207502554 U CN 207502554U CN 201721688561 U CN201721688561 U CN 201721688561U CN 207502554 U CN207502554 U CN 207502554U
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Abstract
The utility model discloses transient state oil stream velocity measuring devices during a kind of impact of transformer short-circuit, the technical issues of for solving only to have the stable state flow velocity measuring technique of transformer oil in the prior art, and can not accurately measure to obtain transformer transient state oil stream velocity variations when by short-circuit impact.The utility model embodiment includes：Transient state oil stream velocity sensor and signal acquisition recorder；Transient state oil stream velocity sensor is installed on the pipeline between oil tank of transformer and conservator, for measuring the transient state oil stream speed in pipeline；Transient state oil stream velocity sensor includes stress target plate and power sensing element, and stress target plate is set to the inside of pipeline, and power sensing element is connect with stress target plate, for measuring the active force of oil stream impact that stress target plate is subject to；Signal acquisition recorder is connect with transient state oil stream velocity sensor, and oil stream flow velocity is converted to for acquiring and recording the active force of oil stream impact that stress target plate is subject to and be transmitted to arithmetic processing apparatus and carry out operation.
Description
Technical field
When being impacted the utility model is related to transformer oil flow velocity degree field of measuring technique more particularly to a kind of transformer short-circuit
Transient state oil stream velocity measuring device.
Background technology
During the transformer use of electric system, under larger passing through property short circuit current effect, transformer winding
Radial displacement can be generated, increases the oil clearance between armature winding and secondary windings, is generated on the inside of oil clearance and on the outside of winding certain
Pressure differential, make fry dried food ingredients life flowing.When pressure differential changes greatly, can cause to produce in the oil pipe between oil tank of transformer and conservator
Raw larger transient state oil stream, the transient state oil stream in oil pipe can impact the baffle of Buchholz relay, be missed so as to cause Buchholz relay
It is dynamic.
At present, though the flow velocity of the Buchholz relay for being set on transformer is adjusted there are one instructing setting range,
But it without more detailed theoretical foundation, mostly leans on engineering experience value and is set.And for the survey of transformer oil flow velocity degree
Amount, only has stable state flow velocity measuring technique both at home and abroad at present, perfect Method and kit for is there is no for the measurement of transient state oil flow rate.
Caused oil flow rate situation of change when therefore not yet can accurately know transformer by short-circuit impact at present, can not be to becoming
Depressor is restored by the practical oil stream situation of change inside oil pipe during short-circuit impact, can not also know whether that tune can be passed through
The flow velocity setting valve of whole Buchholz relay evade the Buchholz relay malfunction caused by transient state oil stream.
Utility model content
The utility model embodiment provides transient state oil stream velocity measuring device during a kind of transformer short-circuit impact, solves
Only have the stable state flow velocity measuring technique of transformer oil in the prior art, and can not accurately measure obtain transformer by
The technical issues of transient state oil stream velocity variations during short-circuit impact.
Transient state oil stream velocity measuring device during a kind of transformer short-circuit impact that the utility model embodiment provides, packet
It includes：
Transient state oil stream velocity sensor and signal acquisition recorder；
Transient state oil stream velocity sensor is installed on the pipeline between oil tank of transformer and conservator, for measuring in pipeline
Transient state oil stream speed；
Transient state oil stream velocity sensor includes stress target plate and power sensing element, and stress target plate is set to the inside of pipeline,
Power sensing element is connect with stress target plate, for measuring the active force of oil stream impact that stress target plate is subject to；
Signal acquisition recorder is connect with transient state oil stream velocity sensor, for acquiring and recording the oil that stress target plate is subject to
It flows the active force of impact and is transmitted to arithmetic processing apparatus progress operation and be converted to oil stream flow velocity.
Preferably, signal acquisition recorder includes signal picker and storage unit；
Signal picker is used to acquire the active force of oil stream impact that stress target plate is subject to；
The active force of oil stream impact that storage unit is subject to for real-time record storage stress target plate.
Preferably, transient state oil stream velocity sensor further includes：Arithmetic processor；
Arithmetic processor is set to the inside of transient state oil stream velocity sensor, and arithmetic processor connects with power sensing element
It connects, for obtaining stable state oil stream speed according to stressing conditions calculation process of the power sensing element under the effect of stable state oil stream.
Preferably, transient state oil stream velocity sensor further includes：Display dial；
Display dial is connect with arithmetic processor, the stable state oil stream obtained for real-time display arithmetic processor calculation process
Speed.
Preferably, transient state oil stream velocity sensor further includes：Connecting component is isolated；
Isolation connecting component is set between power sensing element and arithmetic processor, at for power sensing element and operation
It manages device and isolation interface channel is provided, prevent transformer oil from entering arithmetic processor.
As can be seen from the above technical solutions, the utility model embodiment has the following advantages：
By installing transient state oil stream velocity sensor on the pipeline between oil tank of transformer and conservator, and utilize transient state oil
Flow oil of the stress target plate and power sensing element measuring transformer on velocity sensor when by short-circuit impact inside pipeline
The active force that stream velocity variations generate stress target plate, is then obtained power sensing element by signal acquisition recorder
Active force is acquired and stores record.Corresponding oil stream speed is converted to since the active force obtained to measurement carries out operation
Certain computer processing time is needed, therefore first records the active force collected storage, then handled by high-speed computation
Device carries out the active force recorded to correspond operation conversion, can save down active force operation being converted to oil flow rate
The computer processing time of degree is usually by making so as to break the measurement gap time of traditional stable state oil stream speed measurement techniques
Firmly sensing time and active force are converted to oil stream Velocity Time and are superimposed determined routine so that transient state oil stream tachometric survey
Off time shorten to the force sensor time, can will foreshorten within 100ms the response time so that transient state oil stream speed pass
Sensor can quickly measure transformer by during short-circuit impact oil stream spot speed change, solve and only have in the prior art
The stable state flow velocity measuring technique of transformer oil, and can not accurately measure the transient state oil for obtaining transformer when by short-circuit impact
The technical issues of flowing velocity variations.
Description of the drawings
It in order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property
It puts, can also be obtained according to these attached drawings other attached drawings.
Transient state oil stream velocity measuring device when Fig. 1 is a kind of transformer short-circuit impact that the utility model embodiment provides
Structure diagram.
Transient state oil stream velocity measuring device when Fig. 2 is a kind of transformer short-circuit impact that the utility model embodiment provides
Instrumentation plan is installed.
Specific embodiment
The utility model embodiment provides transient state oil stream velocity measuring device during a kind of transformer short-circuit impact, is used for
The stable state flow velocity measuring technique for only having transformer oil in the prior art is solved, and can not accurately measure acquisition transformer and meet with
The technical issues of transient state oil stream velocity variations during by short-circuit impact.
Purpose of utility model, feature, advantage to enable the utility model is more apparent and understandable, below will knot
The attached drawing in the utility model embodiment is closed, the technical scheme in the utility model embodiment is clearly and completely described,
Obviously, the embodiments described below are only the utility model part of the embodiment, and not all embodiment.Based on this reality
With the embodiment in novel, those of ordinary skill in the art are obtained all other without making creative work
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, transient state oil stream speed when being impacted for a kind of transformer short-circuit that the utility model embodiment provides
The structure diagram of measuring device.
Transient state oil stream velocity measuring device during a kind of transformer short-circuit impact that the utility model embodiment provides, packet
It includes：
Transient state oil stream speed sensors A and signal acquisition recorder B.Transient state oil stream speed sensors A is installed on transformer
On pipeline 1 between fuel tank and conservator, for measuring the oil stream speed in pipeline 1.Transient state oil stream speed sensors A includes stress
Target plate 2 and power sensing element 3, stress target plate 2 are set to the inside of pipeline 1, and power sensing element 3 connect with stress target plate 2, is used for
Measure the active force of oil stream impact that stress target plate 2 is subject to.Signal acquisition recorder B is connect with transient state oil stream speed sensors A,
Operation conversion is carried out for acquiring and recording the active force of oil stream impact that stress target plate 2 is subject to and be transmitted to arithmetic processing apparatus
For oil stream flow velocity.Wherein, signal acquisition recorder B includes signal picker and storage unit；Signal picker for acquire by
The active force of oil stream impact that power target plate 2 is subject to；The oil stream impact that storage unit is subject to for real-time record storage stress target plate 2
Active force.
When transformer oil flows in diversion pipe, kinetic energy and the pressure differential that generates during because of stress target plate 2 because its own,
Power can be acted to stress target plate 2, the size of active force and velocity of medium it is square directly proportional, as shown in formula one：
F=CA ρ U2/2 (1)
In formula：F is the active force suffered by force-summing element, and C is object resistance coefficient, and ρ is Media density under operating mode, and U is is situated between
Mean flow rate of the matter in measurement pipe, A are force-summing element to measurement pipe axial projective area.By to suffered by stress target plate 2
Amount of force measurement, you can calculate outlet pipe in transformer oil flow velocity size.
Transient state oil stream speed sensors A and the operation principle process of signal acquisition recorder B are specific as follows：Due to transient state oil
Flow velocity degree sensors A is target plank frame, i.e., stress target plate 2 is provided in oil stream pipeline 1, when transformer receives short-circuit impact
When, a transient state oil stream can be generated and flow into transient state oil flow rate sensor, impact target plate 2 generates stress target plate 2 in a work
Firmly, which can act on simultaneously on the power sensing element 3 being connect with stress target plate 2.And the size and oil stream of active force
Speed it is square directly proportional, according to the measurement to active force, can accurately calculate the speed of the transient state oil stream.Due to target plate and stress member
Part is Hard link, therefore when target plate stress, force-summing element can act simultaneously, and active force is converted to final displayable
Oil stream speed electric signal such as then needs to handle, calculate and export at a series of processes, and can the time needed for the process determines complete
The whole transient state oil flow rate variation captured in measurement pipe.Traditional stable state oil stream velocity meter is to the gap of oil stream tachometric survey
Time has been generally comprised required for power sensing element 3 senses the time for knowing active force and active force is converted to oil stream speed
A series of signal conversion time.Such as, if the sensing of power sensing element 3 knows that the time of active force is 100ms, active force is converted
It is 200ms for the required a series of signal conversion time of oil stream speed, then stable state oil stream velocity meter surveys oil stream speed
The off time of amount is 300ms, and when transformer is by short-circuit impact, the speed of oil stream can be larger in instantaneous variation, works as measurement
When off time is longer, it can not often measure to obtain the velocity variations of oil stream, i.e., can not obtain transformer and receive short-circuit impact
When transient state oil stream speed situation of change.And by by signal acquisition recorder B and power sensing element in the utility model embodiment
Part 3 connects, and while acquiring the active force of oil stream impact that stress target plate 2 is subject to by using signal picker, additionally uses
Storage unit records and stores the active force of oil stream impact that stress target plate 2 is subject in real time, finally passes through arithmetic processing apparatus again
The active force of record storage in storage unit according to the time sequencing recorded is corresponded and carries out force signals conversion
Conversion for flow velocity electric signal.During whole process measures, although the transient state oil stream speed electric signal finally obtained is relative to pipeline 1
Internal oil stream speed situation of change when short-circuit impact occurring in real time has certain delay, but can be ensured that by transformer by
Transient state oil stream speed situation of change during short-circuit impact completely shows, i.e. the response time of transient state oil flow rate sensor can
Up to 100ms, the measurement request to transient state oil stream speed can be met.
Further, transient state oil stream speed sensors A further includes：Arithmetic processor 5 and display dial 6；Arithmetic processor 5
The inside of transient state oil stream speed sensors A is set to, and arithmetic processor 5 is connect with power sensing element 3, for being sensed according to power
Stressing conditions calculation process of the element 3 under the effect of stable state oil stream obtains stable state oil stream speed.Display dial 6 and arithmetic processor 5
Connection, the stable state oil stream speed obtained for 5 calculation process of real-time display arithmetic processor.It should be noted that calculation process
Device 5 and display dial 6 are similar with conventional stable state oil stream measuring device, are mainly used for measuring and show the oil stream under stable situation
Speed, in order to be monitored in real time to oil stream speed conditions.
Further, in order to avoid stress target plate 2 and power sensing element 3 generate arithmetic processor 5 interference, transient state oil
Flow velocity degree sensors A has further included isolation connecting component 4；Isolation connecting component 4 is set to power sensing element 3 and arithmetic processor
Between 5, interface channel is isolated for being provided for power sensing element 3 with arithmetic processor 5, prevents transformer oil from entering calculation process
Device 5.I.e. the transmission line of power sensing element 3 is connected to arithmetic processor 5 by the way that connecting component 4 is isolated, by the letter of power sensing element 3
Number it is transmitted to arithmetic processor 5.
In order to make it easy to understand, transient state when a kind of transformer short-circuit provided the utility model embodiment is impacted below
The method that the installation of oil stream velocity measuring device measures is described in detail.
Referring to Fig. 2, transient state oil stream speed when being impacted for a kind of transformer short-circuit that the utility model embodiment provides
Measuring device installs instrumentation plan.
Transient state oil stream velocity measuring device installation during a kind of transformer short-circuit impact that the utility model embodiment provides
The specific implementation process of measurement is as follows：
(1) under transformer power failure, the valve at the connecting pipe both ends of conservator C and oil tank of transformer D is closed；
(2) connecting pipe between conservator C and Buchholz relay E is removed, using being equipped with transient state oil stream speed sensors A
Oil pipe be replaced；
(3) signal output end of transient state oil stream speed sensors A is connected to signal acquisition recorder B by signal cable
On；
(4) Zero calibration is carried out to transient state oil stream speed sensors A (to transient state oil stream speed sensors A after assembling
The a series of experiments that design objective carries out)；
(5) transformer resumes operation after state, you can the oil flow rate between conservator C and oil tank of transformer D in connecting tube
It is monitored in real time, when short-circuit impact occurs for transformer, the oil in fuel tank can pour into conservator C by connecting tube, so as to can be
A larger instantaneous velocity is generated in pipe, and is obtained by arithmetic processing apparatus operation.
Transient state oil stream velocity measuring device when being impacted above to a kind of transformer short-circuit provided by the utility model into
It has gone and has been discussed in detail, for those of ordinary skill in the art, based on the idea of the embodiment of the present invention, in specific embodiment party
There will be changes in formula and application range, in conclusion the content of the present specification should not be construed as the limit to the utility model
System.
Claims (5)
1. a kind of transient state oil stream velocity measuring device during transformer short-circuit impact, which is characterized in that including：
Transient state oil stream velocity sensor and signal acquisition recorder；
The transient state oil stream velocity sensor is installed on the pipeline between oil tank of transformer and conservator, for measuring the pipeline
Interior transient state oil stream speed；
The transient state oil stream velocity sensor includes stress target plate and power sensing element, and the stress target plate is set to the pipeline
Inside, the power sensing element connect with the stress target plate, for measuring oil stream impact that the stress target plate is subject to
Active force；
The signal acquisition recorder is connect with the transient state oil stream velocity sensor, for acquiring and recording the stress target plate
Be subject to oil stream impact active force and be transmitted to arithmetic processing apparatus carry out operation be converted to oil stream flow velocity.
2. transient state oil stream velocity measuring device during transformer short-circuit impact according to claim 1, which is characterized in that institute
It states signal acquisition recorder and includes signal picker and storage unit；
The signal picker is used to acquire the active force of oil stream impact that the stress target plate is subject to；
The active force of oil stream impact that the storage unit is subject to for stress target plate described in real-time record storage.
3. transient state oil stream velocity measuring device during transformer short-circuit impact according to claim 1, which is characterized in that institute
Transient state oil stream velocity sensor is stated to further include：Arithmetic processor；
The arithmetic processor is set to the inside of the transient state oil stream velocity sensor, and the arithmetic processor and the power
Sensing element connects, for obtaining stable state oil according to stressing conditions calculation process of the power sensing element under the effect of stable state oil stream
Flow velocity degree.
4. transient state oil stream velocity measuring device during transformer short-circuit impact according to claim 3, which is characterized in that institute
Transient state oil stream velocity sensor is stated to further include：Display dial；
The display dial is connect with the arithmetic processor, is obtained for arithmetic processor calculation process described in real-time display
Stable state oil stream speed.
5. transient state oil stream velocity measuring device during transformer short-circuit impact according to claim 4, which is characterized in that institute
Transient state oil stream velocity sensor is stated to further include：Connecting component is isolated；
The isolation connecting component is set between the power sensing element and the arithmetic processor, for being sensed for the power
Interface channel is isolated with arithmetic processor offer in element, prevents transformer oil from entering arithmetic processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721688561.0U CN207502554U (en) | 2017-12-07 | 2017-12-07 | A kind of transient state oil stream velocity measuring device during transformer short-circuit impact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721688561.0U CN207502554U (en) | 2017-12-07 | 2017-12-07 | A kind of transient state oil stream velocity measuring device during transformer short-circuit impact |
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| CN207502554U true CN207502554U (en) | 2018-06-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107831332A (en) * | 2017-12-07 | 2018-03-23 | 广东电网有限责任公司电力科学研究院 | A kind of transient state oil stream velocity measuring device during transformer short-circuit impact |
| CN110018328A (en) * | 2019-05-07 | 2019-07-16 | 北京中瑞和电气有限公司 | A kind of power transformer on-Line Monitor Device and method based on transient state oil stream feature |
-
2017
- 2017-12-07 CN CN201721688561.0U patent/CN207502554U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107831332A (en) * | 2017-12-07 | 2018-03-23 | 广东电网有限责任公司电力科学研究院 | A kind of transient state oil stream velocity measuring device during transformer short-circuit impact |
| CN110018328A (en) * | 2019-05-07 | 2019-07-16 | 北京中瑞和电气有限公司 | A kind of power transformer on-Line Monitor Device and method based on transient state oil stream feature |
| CN110018328B (en) * | 2019-05-07 | 2024-03-26 | 北京中瑞和电气有限公司 | Power transformer on-line monitoring device and method based on transient oil flow characteristics |
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