CN103528644A - Large-scale oil level monitoring system for converter transformer - Google Patents
Large-scale oil level monitoring system for converter transformer Download PDFInfo
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- CN103528644A CN103528644A CN201210425143.8A CN201210425143A CN103528644A CN 103528644 A CN103528644 A CN 103528644A CN 201210425143 A CN201210425143 A CN 201210425143A CN 103528644 A CN103528644 A CN 103528644A
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Abstract
The invention discloses a large-scale oil level monitoring system for a converter transformer. The oil level monitoring system mainly comprises a mechanical oil level meter, a piezoresistive sensor and a bag inner leakage detection device. The oil level meter displays the oil level on the spot, is arranged at the position, where the oil level meter is convenient to observe, of a conversion variable inspection channel, and is used for observation during daily inspection; contacts are selected from a point dial to carry out signal remote transmission oil level abnormity warning; the piezoresistive sensor is installed at the bottom of an oil storage cabinet and measures oil pressure changes inside the oil storage cabinet, the monitoring system outputs the oil pressure changes to a background, and the oil level is displayed in a digital mode; the bag inner leakage detection device monitors whether oil leakage exists in a bag of the oil storage cabinet, the inner leakage of the bag is detected timely in the early stage of faults, and the faults are prevented from being worsen or enlarged. The system is provided with the independent pressure sensor oil level monitoring device, the defects are overcome, mutual complementation of on-spot displaying (as the contacts are arranged in the dial) of the mechanical oil level meter and oil level monitoring of the pressure sensor is achieved, and reliability and intelligence standard of operation of the system are improved remarkably.
Description
Technical field
The present invention relates to field transformer, especially a kind of large-sized converter transformer oil level surveillance.
Background technology
Development along with HVDC (High Voltage Direct Current) transmission system, converter power transformer becomes one of important equipment of DC transmission system, it has, and cost is high, volume is large and oil-filled many features, and oil mass is sufficient, the reliable and stable work of oil level monitoring arrangement is the prerequisite that guarantees straight-flow system stable operation.Traditional oil level monitoring arrangement because principle is single, the reason such as the easy bite of mechanical hook-up and the stroke output signal node of dependence stem-winder meter own causes operational reliability not high, can not meet fast-developing high-capacity direct current transmission of electricity high reliability, the intelligentized requirement of equipment operation management.
Make full use of the supervisory system of present level robotization in station, large-sized converter transformer oil level surveillance is optimized to design, meet principle complementation, redundant configuration, high reliability and highly intelligentized requirement, for the reliability, stability and the intelligent level tool that improve transformer long-time running, be of great significance.
Summary of the invention
In order to solve traditional oils level measuring arrangement, have that unit piece is irredundant, the easy bite of mechanical driving device, operational reliability is not high and temperature compensation is not enough problem, the present invention proposes a kind of large-sized converter transformer oil level surveillance, configure a set of independently pressure transducer oil level monitoring arrangement, make up above deficiency, realize stem-winder meter and show that on the spot (signalization contact in dial plate) monitors mutually and supplement with pressure transducer oil level, can significantly improve equipment reliability of operation and intelligent level.
The technical scheme that the present invention solves its technical matters employing is: this oil level surveillance is mainly comprised of device for detecting leakage in mechanical type oil level gage meter, piezoresistance sensor and capsule; Oil level gage meter shows oil level on the spot, is arranged at change of current change and patrols and examines the position that passage is convenient to observation, for Daily Round Check observation, gets contact and carry out the signal is far passed oil level abnormal alarm in pointer watch dial; Piezoresistance sensor is arranged on oil conservater bottom piezoresistance sensor to be changed by the oil pressure of measuring in oil conservater, and supervisory system exports backstage to, and numeral shows oil level; In capsule, device for detecting leakage monitors in oil conservater capsule whether exist oil to leak, in fault, to detect in capsule and leak in time in early days, to prevent deterioration and the expansion of fault.
Above-mentioned mechanical type oil level gage meter is comprised of float, drive link, gearing, lower piston, capillary pipeline, node running part, upper piston, local panel, signal alarm node, as shown in Figure 1.
Above-mentioned pressure drag sensing (change is sent) device is selected two-wire system, (10～30) V DC input, (4～20) mA output.
The invention has the beneficial effects as follows that to have overcome mechanical type oil level gage meter principle single, signal node needs people for carrying out temperature compensation, the deficiency that mechanical hook-up operational reliability is not high and unit piece fault causes oil level to monitor, mechanical measurement in principle, pressure drag sensing, in capsule, undetected survey principle is complementary, make full use of existing supervisory system, technological transformation feasibility is strong, there is the excellent scarce complementation of various monitoring meanss, redundant configuration, high reliability and highly intelligentized advantage, fully met the high reliability of fast-developing large capacity high DC transmission system exchange rheology operation, the requirement of stability.
Accompanying drawing explanation
Fig. 1 float-type machinery oil level measuring arrangement structural representation;
Fig. 2 pressure sensing surveillance theory diagram;
Undetected examining system theory diagram in Fig. 3 capsule;
1. floats in figure, 2. drive link, 3. gearing, 4. lower piston, 5. upper piston, 6. capillary pipeline, 7. node running part, 8. signal alarm node, 9. local panel.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated: as shown in Figure 1, float in oil conservater is used for the variation of sensing oil level, the link rod of float is fixed on a protruding dish of transmission of oil conservater bottom, thimble one end on the protruding dish of transmission is nonconcentric(al) to be connected with float link rod, one end by with oil conservater bottom pass in oil seal structure.The part of thimble in oil conservater outside is fixed on to be had on the two way circuit device that is full of liquid transmission material, by moving up and down of thimble, drives liquid transmission in capillary pipeline partly to make pointer at a distance rotate.When oil level changes, float link rod drives thimble above-below direction to move, and this variation drives again to become send one end expansion in device and one end is shunk and impelled liquid flow in capillary pipeline to drive the rotation of indicator at a distance to show corresponding registration.The design of this dual transmission makes oil level indicator gearing play the effect of temperature compensation.
When temperature rising oil level rises, float arm moves down together with ball float, the piston rod that drive link in gearing presses down drive upper piston moves down, the piston cylinder of lower piston moves down, cause liquid flow in capillary pipeline (as shown in arrow in Fig. 1), the piston rod of the horizontal piston in local panel shrinks, traction indicator rotates and shows the corresponding oil level value of oil conservater at dial plate numerical value augment direction.The axle that drives pointer to rotate arranges microswitch, microswitch action when dial plate is indicated respectively near minimum, maximum position, warning signal sends that (in Fig. 1, circle is labeled as float arm connection for transmission bar part, when oil level rises ball float together with float arm move up can be to gearing in drive link press down, carry drive link on when oil level declines).
When the oil level in oil conservater reduces, transmission flow process is contrary.
Pressure sensing, its principle is shown in accompanying drawing 2.The piezoresistive transducer that is arranged on oil conservater bottom changes by the oil pressure of measuring in oil conservater, the variation effect that is under pressure of the semiconductor material of sensor itself, its resistivity changes, external voltage source output current changes and delivers to supervisory system, for measurement and monitoring system, when input quantity surpasses after default definite value, in supervisory system, send warning.
Pressure drag sensing (change is sent) device is selected two-wire system, (10～30) V DC input, and (4～20) mA output, convenient and control is protected, supervisory system interface, makes full use of existing monitor supervision platform.By daemon software, add data analysis function, can realize the functions such as oil level storage of history data P and oil level curve, historical data intellectual analysis and contrast, by introducing oil temperature and carrying out temperature compensation, oil level rate of change (relative time) alarming value is set with software, can also realize the intelligent online monitoring that transformer oil leaks.
Undetected examining system in capsule, its principle is shown in Fig. 3.Capacitance level meter is that the usual means measured of the interface location of two phase materials is (as measured gas phase
Liquid interphase interface), utilize two inter-electrode capacitance just to change with measured medium thing position and the principle that changes changes measurand the oscillation frequency that is converted to electric capacitance change and then changes oscillatory circuit.Oscillatory circuit in sensor changes by thing position the electric capacity cause and changes and be converted to the variation of frequency, and gives electronic module, as calculated, be converted to quantities after analyzing and processing.For measuring continuous thing position, change the general material level gauge that adopts the output of (4～20) mA electric current, for spacing measurement (as undetected survey in oil conservater capsule), adopt the material level gauge of switching value output, also claim level switch.In material level gauge principle, realize with oil level measuring device and mutually supplementing.
Material level gauge rapier is placed on the bottom in capsule, cable leading is to the sensor (terminal box) that is arranged on oil conservater top, and the signal processing module being arranged in on-site control (terminal box) delivered to signal by sensor, thereby access control is protected, supervisory system, while having oil in capsule, report to the police in backstage.
Claims (3)
1. a large-sized converter transformer oil level surveillance, is characterized in that this oil level surveillance is mainly comprised of device for detecting leakage in mechanical type oil level gage meter, piezoresistance sensor and capsule; Oil level gage meter shows oil level on the spot, is arranged at change of current change and patrols and examines the position that passage is convenient to observation, for Daily Round Check observation, gets contact and carry out the signal is far passed oil level abnormal alarm in pointer watch dial; Piezoresistance sensor is arranged on oil conservater bottom piezoresistance sensor to be changed by the oil pressure of measuring in oil conservater, and supervisory system exports backstage to, and numeral shows oil level; In capsule, device for detecting leakage monitors in oil conservater capsule whether exist oil to leak, in fault, to detect in capsule and leak in time in early days, to prevent deterioration and the expansion of fault.
2. according to the mechanical type oil level gage meter described in claim 1, it is characterized in that being formed by float, drive link, gearing, lower piston, capillary pipeline, node running part, upper piston, local panel, signal alarm node, as shown in Figure 1.
3. according to the piezoresistance sensor described in claim 1, it is characterized in that selecting two-wire system, (10～30) V DC input, (4～20) mA output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210425143.8A CN103528644A (en) | 2012-10-31 | 2012-10-31 | Large-scale oil level monitoring system for converter transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210425143.8A CN103528644A (en) | 2012-10-31 | 2012-10-31 | Large-scale oil level monitoring system for converter transformer |
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| CN103528644A true CN103528644A (en) | 2014-01-22 |
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| CN201210425143.8A Pending CN103528644A (en) | 2012-10-31 | 2012-10-31 | Large-scale oil level monitoring system for converter transformer |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104596614A (en) * | 2014-12-30 | 2015-05-06 | 吴江变压器有限公司 | Horizontal capsule oil storage cabinet oil level measuring method based on oil temperatures |
| CN104880235A (en) * | 2015-06-24 | 2015-09-02 | 西安华舜测量设备有限责任公司 | Indicator for measuring oil level inside transformer sleeve through electric field and measurement method thereof |
| CN105182437A (en) * | 2015-09-29 | 2015-12-23 | 国家电网公司 | Online monitoring device and online monitoring method for converter transformer conservator capsule breaking |
| CN108387344A (en) * | 2018-01-30 | 2018-08-10 | 江山市技装自动化科技有限公司 | A kind of oil-immersed transformer leakage test on-line monitoring system |
| CN109545512A (en) * | 2018-11-28 | 2019-03-29 | 南通世睿电力科技有限公司 | A kind of oil conservater leakage intelligent monitoring device |
| CN109853348A (en) * | 2019-02-28 | 2019-06-07 | 中建七局第四建筑有限公司 | A kind of road construction ground slit cuts device |
| CN112432682A (en) * | 2020-11-09 | 2021-03-02 | 国网山东省电力公司德州供电公司 | Intelligent online monitoring system and method for oil level of oil conservator of transformer body |
-
2012
- 2012-10-31 CN CN201210425143.8A patent/CN103528644A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104596614A (en) * | 2014-12-30 | 2015-05-06 | 吴江变压器有限公司 | Horizontal capsule oil storage cabinet oil level measuring method based on oil temperatures |
| CN104596614B (en) * | 2014-12-30 | 2018-03-16 | 吴江变压器有限公司 | Horizontal capsule oil conservator oil level assay method based on oil temperature |
| CN104880235A (en) * | 2015-06-24 | 2015-09-02 | 西安华舜测量设备有限责任公司 | Indicator for measuring oil level inside transformer sleeve through electric field and measurement method thereof |
| CN104880235B (en) * | 2015-06-24 | 2018-06-01 | 西安华舜测量设备有限责任公司 | The indicator and its measuring method of oil level in a kind of electric field measurement bushing shell for transformer |
| CN105182437A (en) * | 2015-09-29 | 2015-12-23 | 国家电网公司 | Online monitoring device and online monitoring method for converter transformer conservator capsule breaking |
| CN108387344A (en) * | 2018-01-30 | 2018-08-10 | 江山市技装自动化科技有限公司 | A kind of oil-immersed transformer leakage test on-line monitoring system |
| CN109545512A (en) * | 2018-11-28 | 2019-03-29 | 南通世睿电力科技有限公司 | A kind of oil conservater leakage intelligent monitoring device |
| CN109545512B (en) * | 2018-11-28 | 2020-11-17 | 南通世睿电力科技有限公司 | Intelligent leakage monitoring device for oil conservator |
| CN109853348A (en) * | 2019-02-28 | 2019-06-07 | 中建七局第四建筑有限公司 | A kind of road construction ground slit cuts device |
| CN112432682A (en) * | 2020-11-09 | 2021-03-02 | 国网山东省电力公司德州供电公司 | Intelligent online monitoring system and method for oil level of oil conservator of transformer body |
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Application publication date: 20140122 |