CN204241498U - The monitoring device of transformer oil stream flow velocity - Google Patents

The monitoring device of transformer oil stream flow velocity Download PDF

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Publication number
CN204241498U
CN204241498U CN201420279049.0U CN201420279049U CN204241498U CN 204241498 U CN204241498 U CN 204241498U CN 201420279049 U CN201420279049 U CN 201420279049U CN 204241498 U CN204241498 U CN 204241498U
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Prior art keywords
unit
flow velocity
connects
alarm
transformer
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CN201420279049.0U
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王志鹏
王天正
张健
俞华
陈昱同
高鹏
李艳鹏
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Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
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Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
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Abstract

The utility model provides a kind of monitoring device of transformer oil stream flow velocity, and wherein, described monitoring device comprises: for obtaining the oily flow velocity measuring unit of transformer oil stream flow; Transformer oil stream flow for obtaining according to described oily flow velocity measuring unit determines whether the alarm unit of reporting to the police; Described oily flow velocity measuring unit is connected with described alarm unit, and described device also comprises: the simulating signal for being exported by oily flow velocity measuring unit is converted to the AD conversion unit of digital signal; The input end of described AD conversion unit connects described oily flow velocity measuring unit, and the output terminal of described AD conversion unit connects described alarm unit.Above-mentioned monitoring device can realize the fault pre-alarming to transformer before transformer breaks down, and improved the accuracy rate to transformer fault early warning.

Description

The monitoring device of transformer oil stream flow velocity
Technical field
The utility model relates to circuit engineering, particularly relates to a kind of monitoring device of transformer oil stream flow velocity.
Background technology
At present, there is friction between transformer oil and insulating paper in transformer, in transformer operational process, certain electric charge will be produced, cause partial discharge phenomenon, cause methane in transformer, acetylene (C 2h 2) etc. the sharply increase of characteristic gas content, cause transformer to run dangerous.
In prior art, by the on-line monitoring to oil gas chromatogram in transformer, know the content of oil gas in transformer, effectively to prevent the fault of transformer.Such as, ruuning situation and the trend of transformer is judged by the content of various characteristic gas.As shown in Figure 1, transformer oil gas monitoring device gathers oil gas in transformer by oil sample collecting unit, and then the oil gas chromatogram of oil gas in transformer is obtained by gas-oil separation unit, chromatographic resolution unit and gas detection cell, the ruuning situation of transformer can be known according to oil gas chromatogram.
In addition, the monitoring also obtaining oil temperature and micro-water in transformer in prior art uses to coordinate oil gas chromatogram.
But the monitoring of above-mentioned oil gas chromatogram, oil temperature and micro-water is true to the forecasting inaccuracy of transformer fault, cannot realize the early warning to transformer fault.
Utility model content
For defect of the prior art, the utility model provides a kind of monitoring device of transformer oil stream flow velocity, for realizing the early warning to transformer fault before breaking down at transformer, improves the accuracy rate to transformer fault early warning.
The utility model provides a kind of monitoring device of transformer oil stream flow velocity, comprising:
For obtaining the oily flow velocity measuring unit of transformer oil stream flow,
Transformer oil stream flow for obtaining according to described oily flow velocity measuring unit determines whether the alarm unit of reporting to the police;
Described oily flow velocity measuring unit is connected with described alarm unit;
Described device also comprises: the simulating signal for being exported by oily flow velocity measuring unit is converted to the AD conversion unit of digital signal;
The input end of described AD conversion unit connects described oily flow velocity measuring unit, and the output terminal of described AD conversion unit connects described alarm unit.
Alternatively, described device also comprises: shaping unit;
The input end of described shaping unit connects the output terminal of described AD conversion unit, and the output terminal of described shaping unit connects described alarm unit.
Alternatively, described device also comprises: for converting electrical signals to the photoelectric sensor of light signal, and for recording the data collection control unit of described transformer oil stream flow;
The input end of described photoelectric sensor connects the output terminal of described AD conversion unit, and the output terminal connection data of described photoelectric sensor gathers control module.
Alternatively, described oily flow velocity measuring unit is vortex shedding flow meter.
Alternatively, described alarm unit comprises: power transformer, alarm lamp, warning driving, alarm speaker;
Described power transformer input end connects alternating source, and output terminal connects described alarm lamp respectively, described warning drives and described alarm speaker;
Described input end of reporting to the police driving connects the output terminal of described shaping unit, and the output terminal that described warning drives connects alarm lamp and described alarm speaker.
Alternatively, described shaping unit comprises: the first phase inverter and the second phase inverter; The output terminal of described first phase inverter connects the input end of described second phase inverter.
Alternatively, in photoelectric sensor, first resistance of connecting with light emitting diode is 510 Europe, and the second resistance be connected with the emitter of NPN type compound transistor is 2000 Europe.
As shown from the above technical solution, the monitoring device of transformer oil stream flow velocity of the present utility model, by arranging the oily flow velocity measuring unit obtaining transformer oil stream flow; Transformer oil stream flow for obtaining according to described oily flow velocity measuring unit determines whether the alarm unit of reporting to the police, and then can realize the early warning to transformer fault before transformer breaks down, and improves the accuracy rate to transformer fault early warning.
Accompanying drawing explanation
Fig. 1 is the structural representation of transformer oil gas monitoring device in prior art;
The structural representation of the monitoring device of the transformer oil stream flow velocity that Fig. 2 provides for the utility model one embodiment;
The structural representation of the vortex shedding flow meter that Fig. 3 provides for another embodiment of the utility model;
The structural representation of the monitoring device of the transformer oil stream flow velocity that Fig. 4 provides for another embodiment of the utility model;
The structural representation of the shaping unit that Fig. 5 provides for another embodiment of the utility model;
The structural representation of the alarm unit that Fig. 6 provides for another embodiment of the utility model;
The structural representation of the photoelectric sensor that Fig. 7 provides for another embodiment of the utility model.
Embodiment
Fig. 2 shows the structural representation of the monitoring device of the transformer oil stream flow velocity that the utility model one embodiment provides, and as shown in Figure 2, the monitoring device of the transformer oil stream flow velocity of the present embodiment can comprise: oily flow velocity measuring unit 30 and alarm unit 31; Described oily flow velocity measuring unit 30 is electrically connected with described alarm unit 31;
Wherein, oily flow velocity measuring unit 30 is for obtaining transformer oil stream flow, and the transformer oil stream flow that alarm unit 31 can obtain according to described oily flow velocity measuring unit 30 determines whether the alarm unit of reporting to the police.
That is, described oily flow velocity measuring unit 30 is for the flow of Real-time Obtaining transformer oil stream; Alarm unit 31, for the transformer oil stream flow of described oily flow velocity measuring unit acquisition and preset flow value being compared, if the transformer oil stream flow of described acquisition is more than or equal to preset flow value, then sends warning message.
Oil flow velocity measuring unit 30 can monitor the mobility status of transformer oil medium at any time.In the present embodiment, described oily flow velocity measuring unit 30 can be stress-type vortex street flowmeter, and as shown in Figure 3, vortex shedding flow meter can comprise flowmeter bodies 301, detecting amplifier 302, radome 303;
In flowmeter bodies 301, flow element exports the alternation charge signal of oil stream in the transformer of acquisition to detecting amplifier, and detecting amplifier 302 alternation charge signal amplifies and is converted to pulse signal; Radome is used for the connection of detecting amplifier 302 and flow element to shield, and prevents external interference.
In embody rule process, in flowmeter bodies 301, flow element can be piezocrystal element.
The principle of work of above-mentioned vortex shedding flow meter is simply described as follows: the flow element in flowmeter bodies 301 inserts in pipeline fluid, whirlpool is produced in the downstream of flow element, alterante stress is produced because whirlpool is separated in flowmeter bodies 301 both sides, flow element produces alternation electric charge by alterante stress effect, after alternation electric charge is carried out conversion process by detecting amplifier 302, export the pulse signal/current signal of whirlpool.
Above-mentioned vortex shedding flow meter has the advantages such as precision is high, measurement range is wide and reliability is high, the pressure loss is little.The performance index of vortex shedding flow meter are as shown in following table one.
Table 1
Above-mentioned vortex shedding flow meter, is in 42 × 10 to 67 × 10 scopes at Reynolds number, has the good linearity, calculate by this reynolds number range, and the maximum range ratio of vortex shedding flow meter can reach 300:1.In certain reynolds number range, the frequency that vortex is separated only is directly proportional to the volumetric flow rate under fluid operating state.And it is insensitive to detected fluid pressure, temperature, viscosity and change of component.
In addition, above-mentioned vortex shedding flow meter has radome, and make the anti-electromagnetic interference capability of vortex shedding flow meter strong, reliability is high.Further, vortex shedding flow meter can measure liquid, gas and steam flow, and it exports the pulse signal be directly proportional to rate of flow of fluid, there is not drift problem.
In a kind of possible implementation, the monitoring device of the oil stream flow velocity of the transformer shown in earlier figures 2 also can comprise: AD conversion unit shaping unit;
Wherein, the simulating signal for being exported by oily flow velocity measuring unit 30 is converted to the AD conversion unit 33 of digital signal,
The input end of described AD conversion unit 33 connects described oily flow velocity measuring unit 30, and the output terminal of described AD conversion unit 33 connects described alarm unit 31.
Preferably, on the basis of the monitoring device shown in Fig. 2, the monitoring device of the transformer oil stream flow velocity in the present embodiment also comprises: shaping unit 34 and AD conversion unit 33, as shown in Figure 4.
Wherein, the input end stating AD conversion unit 33 connects described oily flow velocity measuring unit 30, and the output terminal of described AD conversion unit 33 connects the input end of shaping unit 34, and the output terminal of described shaping unit 34 connects described alarm unit 31.
For example, shaping unit 34 comprises: the first phase inverter 341 and the second phase inverter 342, and as shown in Figure 5, the output terminal of described first phase inverter 341 connects the input end of described second phase inverter 342.The input end of described first phase inverter 341 is as the input end of shaping unit 34, and the output terminal of described second phase inverter 342 is as the output terminal of shaping unit 34.
The electric signal that the first above-mentioned phase inverter 341 and the second phase inverter 342 pairs of AD conversion unit export carries out shaping, time when the electric signal inputted lower than some values, exports ' 0 ' by shaping circuit; When the electric signal inputted is higher than some values, export ' 1 ' by shaping circuit.So just output by two phase inverters the warning that a regular square-wave pulse signal gives in alarm unit to drive.
In addition, as shown in Figure 6, alarm unit 31 comprises: power transformer 311, alarm lamp 312, warning driving 313, alarm speaker 314;
Described power transformer 311 input end connects alternating source (taking power supply namely in transformer station), and output terminal connects described alarm lamp 312, described warning driving 313 and described alarm speaker 314 respectively;
The input end of described warning driving 313 connects the output terminal of described shaping unit 34, and described warning drives the output terminal of 313 to connect alarm lamp 312 and described alarm speaker 314.
It should be noted that, chip is integrated with in warning driving 313, and store the pulse signal corresponding with preset flow value in this chip, when the maximal value of pulse signal that warning driving 313 receives is greater than pulse signal corresponding to preset flow value, the connection of warning driving 313 conducting alarm lamp 312 and alarm speaker 314, makes alarm lamp 312 and alarm speaker 314 send the early warning of transformer fault to transformer staff.
In a particular application, warning drives accessible site AT89C51 single-chip microcomputer.Warning driver output contact is equivalent to a switch, and when transformer oil stream flow velocity exceedes preset flow value, reporting to the police to drive starts, and alarm speaker and pilot lamp send corresponding signal.
In a particular application, the monitoring device of the transformer oil stream flow velocity shown in earlier figures 4 also comprises: for converting electrical signals to the photoelectric sensor 35 (as shown in Figure 7) of light signal, and for recording the data collection control unit 36 of described transformer oil stream flow;
Wherein, the input end of described photoelectric sensor 35 connects the output terminal of described AD conversion unit 33, and the output terminal connection data of described photoelectric sensor 35 gathers control module 36.
Photoelectric sensor 35 in the present embodiment is changed for signal AD conversion unit 33 exported, to be stored in data collection control unit 36 preferably, facilitate staff's real time inspection and contrast oil in transformer and flow the change of flow velocity, obtain the actual working state of transformer, realize the real-time remote monitoring of data.That is, all data stored in data collection control unit are under the unified communication protocol of IEC61850, and the malfunction for transformer is assessed and provided comprehensively integrated Data support and long-range communication modes.
It should be noted that in the photoelectric sensor of the present embodiment, first resistance (R1) of connecting with light emitting diode is 510 Europe, and the second resistance (R2) be connected with the emitter of NPN type compound transistor is 2000 Europe.
The monitoring device comprising photoelectric sensor and data collection control unit shown in Fig. 4 can be intelligent integrated device, can realize the state monitoring oil flow electrification in transformer in real time.
The monitoring device of above-mentioned transformer oil stream flow velocity can effectively avoid the fault of transformer oil flow electrification to occur, the using state assessment that can be transformer provides more efficiently data, and then the synchronous dynamic monitoring achieved oil stream flow velocity and flow, and the restriction of relevant oil stream mobility is set, achieve warning function.In addition, the monitoring device structure of transformer oil stream flow velocity is simple, easy for installation, can promote the use of on a large scale.
The monitoring device of the present embodiment also can in conjunction with transformer oil gas monitoring device of the prior art, the real time data of transformer oil stream flow velocity and the real time data etc. of oil gas chromatogram are all stored in data collection control unit, realize staff to the real-time analysis of data and monitoring.
In addition, corresponding to the monitoring device of above-mentioned transformer oil stream flow velocity below monitoring method is briefly described.
The flow of transformer oil stream in S01, acquisition preset time period;
S02, the transformer oil stream flow of acquisition and preset flow value to be compared;
If the transformer oil stream flow of the described acquisition of S03 is more than or equal to preset flow value, then send warning message.
For example, abovementioned steps S01 can comprise following sub-step S011 to sub-step S013:
The mean flow rate v of transformer oil stream in S011, detection Preset Time;
S012, according to Q 0=Sv, obtains the average discharge Q of transformer oil stream 0;
S013, basis obtain the flow Q of transformer oil stream in Preset Time t;
Wherein, S is the cross-sectional area of described transformer oil stream, t 0initial time in preset time period, t 1end time in preset time period.
Above by the flow velocity to transformer oil oil stream, sectional area and the relation of time, obtain the distribution situation of transformer oil oil stream, can analyze the trend that transformer fault occurs, accomplish the generation preventing transformer oil flow electrification fault, improve the accuracy rate to transformer fault early warning.
Last it is noted that above each embodiment is only in order to illustrate the technical solution of the utility model, be not intended to limit; Although be described in detail the utility model with reference to foregoing embodiments, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of claim of the present utility model protection.

Claims (7)

1. a monitoring device for transformer oil stream flow velocity, is characterized in that, comprising:
For obtaining the oily flow velocity measuring unit of transformer oil stream flow;
Transformer oil stream flow for obtaining according to described oily flow velocity measuring unit determines whether the alarm unit of reporting to the police;
Described oily flow velocity measuring unit is connected with described alarm unit;
Described device also comprises: the simulating signal for being exported by oily flow velocity measuring unit is converted to the AD conversion unit of digital signal;
The input end of described AD conversion unit connects described oily flow velocity measuring unit, and the output terminal of described AD conversion unit connects described alarm unit.
2. device according to claim 1, is characterized in that, described device also comprises: shaping unit;
The input end of described shaping unit connects the output terminal of described AD conversion unit, and the output terminal of described shaping unit connects described alarm unit.
3. device according to claim 1, is characterized in that, described device also comprises: for converting electrical signals to the photoelectric sensor of light signal, and for recording the data collection control unit of described transformer oil stream flow;
The input end of described photoelectric sensor connects the output terminal of described AD conversion unit, and the output terminal connection data of described photoelectric sensor gathers control module.
4., according to the arbitrary described device of claims 1 to 3, it is characterized in that, described oily flow velocity measuring unit is vortex shedding flow meter.
5. device according to claim 2, is characterized in that, described alarm unit comprises:
Power transformer, alarm lamp, warning driving, alarm speaker;
Described power transformer input end connects alternating source, and output terminal connects described alarm lamp respectively, described warning drives and described alarm speaker;
Described input end of reporting to the police driving connects the output terminal of described shaping unit, and the output terminal that described warning drives connects alarm lamp and described alarm speaker.
6. device according to claim 2, is characterized in that, described shaping unit comprises:
First phase inverter and the second phase inverter;
The output terminal of described first phase inverter connects the input end of described second phase inverter.
7. device according to claim 3, is characterized in that, in photoelectric sensor, first resistance of connecting with light emitting diode is 510 Europe, and the second resistance be connected with the emitter of NPN type compound transistor is 2000 Europe.
CN201420279049.0U 2014-05-28 2014-05-28 The monitoring device of transformer oil stream flow velocity Active CN204241498U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110165778A (en) * 2019-05-07 2019-08-23 西安交通大学 A kind of oil-immersed power transformer non-ionizing energy loss fault wave recording device and method
CN110231523A (en) * 2019-05-07 2019-09-13 西安交通大学 A kind of oil-immersed power transformer protection fault wave recording device and method
WO2020224536A1 (en) * 2019-05-07 2020-11-12 北京中瑞和电气有限公司 Transformer digital gas protection and oil flow surge monitoring integrated device and method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110165778A (en) * 2019-05-07 2019-08-23 西安交通大学 A kind of oil-immersed power transformer non-ionizing energy loss fault wave recording device and method
CN110231523A (en) * 2019-05-07 2019-09-13 西安交通大学 A kind of oil-immersed power transformer protection fault wave recording device and method
WO2020224536A1 (en) * 2019-05-07 2020-11-12 北京中瑞和电气有限公司 Transformer digital gas protection and oil flow surge monitoring integrated device and method

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