CN2569119Y - On-line monitor for hot-spot temp of transformer winding - Google Patents

On-line monitor for hot-spot temp of transformer winding Download PDF

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Publication number
CN2569119Y
CN2569119Y CN 02277285 CN02277285U CN2569119Y CN 2569119 Y CN2569119 Y CN 2569119Y CN 02277285 CN02277285 CN 02277285 CN 02277285 U CN02277285 U CN 02277285U CN 2569119 Y CN2569119 Y CN 2569119Y
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CN
China
Prior art keywords
signal
transformer
sensor
temperature
hot
Prior art date
Application number
CN 02277285
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Chinese (zh)
Inventor
郭长泰
王英华
吴文强
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新疆特变电工股份有限公司
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Priority to CN 02277285 priority Critical patent/CN2569119Y/en
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Publication of CN2569119Y publication Critical patent/CN2569119Y/en

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Abstract

The utility model relates to an on-line monitor for a hot-spot temperature of a transformer winding, which comprises a ring current mutual inductor which is installed on the tail of a capacitive insulating sleeve of a transformer, a leading-out terminal of the ring current mutual inductor is in short connection with a cable wire which is penetrated through a load current sensor, a voltage signal which is inducted by the load current sensor is accessed to a signal conditioning circuit, and the voltage signal is converted into a standard signal and is accessed to a foreground industrial control computer. The utility model is also provided with a top layer oil temperature sensor, and a probe of the top layer oil temperature sensor is installed and inserted into a thermometer seat which is arranged at the upper part of the transformer. An inducted signal of the sensor is accessed to the signal conditioning circuit through a cable wire, and is converted into a standard signal and is accessed to the foreground industrial control computer which is connected with a data processing computer. The utility model can be used for measuring actual load current I of each phase from sleeve current mutual inductors of each phase, a top layer oil temperature that<alpha> can be measured by a digital oil surface thermometer, a hot-spot temperature of a transformer winding can be monitored in time through a current signal which is inducted by the sensor, and the hot-spot temperature change of the transformer winding can be known in time. When an abnormal condition of the temperature appears, measures can be carried out by people in time or automatic processing can be carried out by an automatic control system, and a transformer fault can be avoided.

Description

The coiling hot point of transformer temperature on-line monitoring device

Technical field

The utility model belongs to transformer is carried out monitoring technical field, relates to a kind of coiling hot point of transformer temperature on-line monitoring device.

Background technology

Large-scale power transformer cryogenic overheating problem is that operation and manufacturing sector all very pay close attention to also one of issue to be resolved.From transformer insulated operation life, it is generally acknowledged that should follow six degree rules is that year-round average temperature is 98 ℃, every rising or reduce by 6 ℃, then transformer life reduces half or prolongs one times.The transformer focus allows that limit value is 118 ℃.When hot-spot temperature of transformer surpassed 140 ℃, oil on every side can decomposite gas, causes CO, CO 2Content increases, and paper insulation also can cracking produce furfural simultaneously, will reduce insulating property, influences the normal operation of transformation.Therefore hot spot temperature of winding is carried out the hot(test)-spot temperature situation that on-line monitoring helps in time understanding transformer, go wrong and in time to solve, help prolonging the serviceable life of transformer.And the hot spot temperature of winding that pair transformer is not arranged is at present as yet carried out the effective means of on-line monitoring.

Summary of the invention

It is that a kind of coiling hot point of transformer temperature on-line monitoring device will be provided that this reality is made novel technical matters to be solved, can carry out the real-time continuous monitoring to the coiling hot point of transformer temperature, improves the monitoring level that aligns the transformer that is in operation.

The technical scheme that solution the utility model technical matters is adopted is that this coiling hot point of transformer temperature on-line monitoring device comprises the ring current transformer that transformer condenser type insulating sleeve afterbody is installed, with the leading-out terminal of this ring current transformer with a cable short circuit, this short-circuiting cable passes the load current sensor, the voltage signal that the load current sensor is responded to inserts signal conditioning circuit, modulate circuit inserts the foreground industrial computer with this voltage signal conditioning for standard signal, other has the sensor of a top-oil temperature temperature controller, its probe is installed and is inserted into transformer upper temp meter seat, its induced signal inserts signal conditioning circuit by cable, modulate circuit is converted to standard signal with this current signal and inserts the foreground industrial computer, and industrial computer is connected with the back-end data process computer of diagnosis usefulness.

The IEC354 of International Electrotechnical Commission standard and National Standard oil-immersed power transformer load guide rule " in, having provided the temperature rise of hot spot computing formula, this is traditional classical way of present coiling hot point of transformer temperature estimation.The utility model is made according to this principle.Computing formula according to stable state hot(test)-spot temperature under the arbitrary load:

θ ha+ H GrK yIn the formula: θ h---hot(test)-spot temperature; θ a---top-oil temperature; H Gr---focus is to the temperature rise of winding top oil; K---load factor is by I/I HObtain, I is the actual loading electric current, gets maximal value in the threephase load electric current; I HBe nominal load current, can directly obtain from transformer nameplate parameter; Y---winding temperature index; H Gr, y even load performance data value such as table 1 show.

Therefore, only need measure top-oil temperature and load current I (K=I/I H), just can estimate hot spot temperature of winding.

The utility model gets each phase actual loading electric current I from each phase casing current mutual inductor measuring, and records top-oil temperature θ by digital pasta thermometer aCan be come out by monitoring in time by the electric signal that the top-oil temperature sensor sensing goes out to the coiling hot point of transformer temperature, thereby can in time understand the coiling hot point of transformer temperature variations, when abnormal conditions appear in temperature, make people in time take regulation measure or handle automatically, avoid the generation of transformer fault by automatic control system.

Description of drawings

Below in conjunction with the embodiment accompanying drawing the utility model is described in further detail.

Fig. 1 the utility model structural representation

Fig. 2 circuit structure theory diagram of the present utility model

Fig. 3 the utility model circuit theory diagrams

Among the figure: 1-transformer body, 2-condenser type insulating sleeve, 3-toroidal core current transformer, 4-load current sensor 5-short-circuiting cable, 6-regulating rack 7-4 core shielded cable 8-DB37 cable 9-foreground industrial computer 10-Coaxial Cable 11-backstage diagnostic process computer 12-modulate circuit 13-top-oil temperature sensor probe 14-signal transmssion line, 15-top-oil temperature sensor (temperature controller), 17-pre-amplification circuit, 18-modulus capture card 19-linearity modulate circuit 20-photoelectric isolating circuit (photoelectrical coupler) 21-amplification (decay) filter circuit 22-power supply unit one (± 15V) 23-power supply unit two (± 15V) voltage LC-photoelectrical coupler of R-resistance R W-variable variable resistance C-capacitor I-transformer load electric current U-transformer load current conversion (adopt A4N25) A-operational amplifier J-wire jumper GND-ground connection

Embodiment

Select condenser type punching sensor (model YA-XX-E4) to make to measure the sensor (4) of load current in the present embodiment, it is the temperature controller (15) of XMT-288FC that the top-oil temperature sensor adopts model.One, load current is measured:

The leading-out terminal of the ring current transformer (3) that transformer condenser type insulating sleeve (2) afterbody is installed is with a cable (5) short circuit, this short-circuiting cable (5) passes the condenser type punching sensor (4) that the utility model adopts, condenser type punching sensor (4) induces electric signal, by 4 core shielded cables (7) signal is sent to conditioning rack (6), carry out the conditioning of signal by analog signal conditioner circuit (12), and signal amplified (decay), Filtering Processing, send modulus capture card (18) in the foreground industrial computer (9) to by DB37 cable (8) then, is digital signal by modulus capture card (18) with analog signal conversion, call foreground industrial computer signals collecting program then, be converted to load current value I by certain linear scaling, send backstage diagnostic process computing machine (11) to by coaxial network interface card (PCI-2029) and netting twine, like this, backstage diagnostic process computing machine (11) has just obtained the actual loading electric current I.1, analog signal conditioner circuit (12) is described:

Acquired signal is nursed one's health, be meant after condenser type punching sensor (4) induces electric signal, transmit to conditioning rack (6) through 4 cores (just, bearing signal, ground) shielded cable (7); Then by the linearity modulate circuit (19) in the modulate circuit plate (12) with the input signal linearityization, photoelectric isolating circuit (20) in modulate circuit plate (12) carries out isolation processing (its role is to prevent the impact of external high voltage to this detection system) then, through amplification filtering circuit (21) simulating signal is carried out filtering and noise reduction and processing and amplifying.Analog signal conditioner circuit (12) carries out linearity conditioning, filtering, denoising and processing and amplifying to this simulating signal.

In order to guarantee the versatility and the interference free performance of analog signal conditioner circuit (12), require signal of sensor to unite, be defined as the signal of 0-12V.

Analog signal conditioner circuit (12) comprises linearity modulate circuit (19). photoelectric isolating circuit (20). and amplify (decay) filtering circuit (21), the function that need finish has: signal linearization, electrical isolation, amplification (decay), filtering and function such as power supply is provided.1) photoelectric isolating circuit (20)

Because measuring-signal is from the higher transformer of voltage, so must isolate.Proper through considering to use optocoupler.2) amplify (decay) filtering circuit (21)

Amplification (decay), filtering circuit are designed to the link that can regulate enlargement factor according to the gain situation of front stage circuits, adopt traditional activated amplifier, wave filter.2. analog to digital conversion and data processing

Front end load current simulating signal I is sent to the modulus capture card (18) that is arranged in Foreground Data process computer (9) by DB37 shielded cable (8), is digital signal by the modulus capture card with analog signal conversion; Then, calling corresponding software by Foreground Data process computer (9) carries out software filtering and smoothing processing and digital signal is carried out format conversion being stored in assigned address and showing at Foreground Data process computer (9) to digital signal; Connect backstage diagnostic process computing machine (11) then.Modulus capture card (12) adopts ADLINK PCI-9113, Foreground Data process computer (9) adopts CPU:PIII 850, backstage diagnostic process computing machine (11) adopts CPU:PIII 866, in Foreground Data process computer (9), utilize independently developed foreground capture program, at first digital signal is carried out software filtering and smoothing processing, then according to the requirement of backstage diagnostic process computing machine (11) to the data form, digital signals format is converted to the desired storage format of SQL server database, leaves it in appointed positions at last.

Two, top-oil temperature is measured: it is XMT-288FC temperature controller (15) that top-oil temperature is measured used sensor, the probe of XMT-288FC temperature controller (13) is inserted into transformer upper temp meter seat, the signal of obtaining the oil temperature sends the pre-amplification circuit (17) that XMT-288FC temperature controller (15) inside carries to by signal transmssion line (14), current signal is converted to voltage signal, by 4 core shielded cables (7) signal is sent to conditioning rack (6) again, carry out the conditioning of signal by analog signal conditioner circuit (12), and signal is carried out the linearity nurse one's health, amplify (decay), Filtering Processing, its analog signal conditioner circuit (12) is consistent with the load current signal conditioning circuit.Send modulus capture card (18) in the foreground industrial computer (9) to by DB37 cable (8) then, is digital signal by modulus capture card (18) with analog signal conversion, by foreground industrial computer signals collecting program digital signal is carried out software filtering and smoothing processing, and be converted to the top-oil temperature value by certain linear scaling, then according to the requirement of backstage diagnostic process computing machine (11) to the data form, digital signals format is converted to the desired storage format of SQL server database, leave it in appointed positions at last, and show at Foreground Data process computer (9); Description in the collection of its detailed process and load current is consistent.With the load current signal, send backstage diagnostic process computing machine (11) to by coaxial network interface card (PCI-2029) and coaxial cablet (10) then, like this, backstage diagnostic process computing machine (11) has just obtained top-oil temperature value θ a

At last, background computer (11) is with the actual loading electric current I and the top-oil temperature value θ that record aCalculate coiling hot point of transformer temperature θ h, and show that when this temperature surpasses the setting value that gives, then send alerting signal, reminds people should be taked the generation of corresponding measure prevention transformer fault.

Table 1 load characteristic data Characteristic Substation transformer Large and medium-sized transformer ????ONAN ???ONA ????F ??OFWFOFA ????F ??ODWFOD ????AF Focus is to the temperature rise H of winding top oil gr(K) ????1.6 ????1.6 ????1.6 ????2.0 Winding temperature index y ????23 ????26 ????22 ????29

Claims (3)

1, a kind of coiling hot point of transformer temperature on-line monitoring device, comprise the ring current transformer (3) that transformer condenser type insulating sleeve (2) afterbody is installed, it is characterized in that the leading-out terminal of this ring current transformer (3) with a cable (5) short circuit, this short-circuiting cable (5) passes load current sensor (4), the electrical signal of reaction of load current sensor (4) inserts signal conditioning circuit (12), modulate circuit is converted to standard signal with this current signal and inserts foreground industrial computer (9), other has the sensor (15) of a top-oil temperature temperature controller, its probe (13) is installed and is inserted into transformer upper temp meter seat, its induced signal inserts signal conditioning circuit by cable, and modulate circuit is converted to standard signal with this current signal and inserts foreground industrial computer (9).
2, coiling hot point of transformer temperature on-line monitoring device according to claim 1 is characterized in that control machine (9) is connected with the back-end data process computer (11) of diagnosis usefulness.
3, coiling hot point of transformer temperature on-line monitoring device according to claim 1 is characterized in that load current sensor (4) adopts condenser type punching sensor.
CN 02277285 2002-09-18 2002-09-18 On-line monitor for hot-spot temp of transformer winding CN2569119Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN 02277285 CN2569119Y (en) 2002-09-18 2002-09-18 On-line monitor for hot-spot temp of transformer winding

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Publication Number Publication Date
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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101939656A (en) * 2008-02-06 2011-01-05 魁北克水电公司 Method and device for measuring the temperature of a hot spot in an oil-containing electric apparatus
CN101949745A (en) * 2010-09-08 2011-01-19 国网电力科学研究院武汉南瑞有限责任公司 Monitoring system of internal temperature and stress of power transformer winding and monitoring method thereof
CN102023059A (en) * 2010-11-22 2011-04-20 重庆大学 Multipath temperature acquisition system for transformer winding temperature distribution characteristics
CN101629854B (en) * 2009-08-08 2011-05-18 深圳市科陆电子科技股份有限公司 Implementation method and system for remote monitoring of oil temperature of power transformer
CN102288316A (en) * 2011-08-29 2011-12-21 杭州鸿程科技有限公司 Digital transformer winding temperature measuring device
CN102359833A (en) * 2011-07-26 2012-02-22 东北电力科学研究院有限公司 Temperature rise test device of winding thermometer for transformer
CN103354150A (en) * 2013-08-01 2013-10-16 南通市海王电气有限公司 Novel dry-type transformer
CN103454001A (en) * 2013-07-23 2013-12-18 大连众和光电科技有限公司 Method and equipment for simultaneously monitoring transformer oil surface temperature and winding temperature
CN104198067A (en) * 2014-08-22 2014-12-10 国家电网公司 Winding temperature measuring method for transformer
CN104697664A (en) * 2015-03-18 2015-06-10 深圳太辰光通信股份有限公司 Method for adjusting hot-spot temperature on-line monitoring of transformer winding
CN105067144A (en) * 2015-07-28 2015-11-18 泰安屹思达智能科技有限公司 Winding temperature calculation method for fiber temperature controller of transformer
CN105973511A (en) * 2016-04-28 2016-09-28 华北电力大学 Distributed optical fiber-based transformer winding stress monitoring system
US9638733B2 (en) 2013-12-13 2017-05-02 General Electric Company Computing device and methods of detecting thermal hotspots in a power distribution system
CN104484569B (en) * 2014-12-19 2018-11-13 国网四川省电力公司资阳供电公司 Hot-spot temperature of transformer computational methods based on thermoelectricity analogy theory

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101939656A (en) * 2008-02-06 2011-01-05 魁北克水电公司 Method and device for measuring the temperature of a hot spot in an oil-containing electric apparatus
CN101939656B (en) * 2008-02-06 2014-08-20 魁北克水电公司 Method and device for measuring the temperature of a hot spot in an oil-containing electric apparatus
CN101629854B (en) * 2009-08-08 2011-05-18 深圳市科陆电子科技股份有限公司 Implementation method and system for remote monitoring of oil temperature of power transformer
CN101949745A (en) * 2010-09-08 2011-01-19 国网电力科学研究院武汉南瑞有限责任公司 Monitoring system of internal temperature and stress of power transformer winding and monitoring method thereof
CN101949745B (en) * 2010-09-08 2012-08-08 国网电力科学研究院武汉南瑞有限责任公司 Monitoring system of internal temperature and stress of power transformer winding and monitoring method thereof
CN102023059B (en) * 2010-11-22 2013-01-02 重庆大学 Multipath temperature acquisition system for transformer winding temperature distribution characteristics
CN102023059A (en) * 2010-11-22 2011-04-20 重庆大学 Multipath temperature acquisition system for transformer winding temperature distribution characteristics
CN102359833A (en) * 2011-07-26 2012-02-22 东北电力科学研究院有限公司 Temperature rise test device of winding thermometer for transformer
CN102288316A (en) * 2011-08-29 2011-12-21 杭州鸿程科技有限公司 Digital transformer winding temperature measuring device
CN103454001A (en) * 2013-07-23 2013-12-18 大连众和光电科技有限公司 Method and equipment for simultaneously monitoring transformer oil surface temperature and winding temperature
CN103354150A (en) * 2013-08-01 2013-10-16 南通市海王电气有限公司 Novel dry-type transformer
US9638733B2 (en) 2013-12-13 2017-05-02 General Electric Company Computing device and methods of detecting thermal hotspots in a power distribution system
CN104198067B (en) * 2014-08-22 2017-03-29 国家电网公司 A kind of winding temperature measuring method for transformator
CN104198067A (en) * 2014-08-22 2014-12-10 国家电网公司 Winding temperature measuring method for transformer
CN104484569B (en) * 2014-12-19 2018-11-13 国网四川省电力公司资阳供电公司 Hot-spot temperature of transformer computational methods based on thermoelectricity analogy theory
CN104697664B (en) * 2015-03-18 2017-03-15 深圳太辰光通信股份有限公司 The method of adjustment coiling hot point of transformer on-line temperature monitoring
CN104697664A (en) * 2015-03-18 2015-06-10 深圳太辰光通信股份有限公司 Method for adjusting hot-spot temperature on-line monitoring of transformer winding
CN105067144A (en) * 2015-07-28 2015-11-18 泰安屹思达智能科技有限公司 Winding temperature calculation method for fiber temperature controller of transformer
CN105973511A (en) * 2016-04-28 2016-09-28 华北电力大学 Distributed optical fiber-based transformer winding stress monitoring system

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Patentee after: Tebian Electrician Co., Ltd.

Patentee before: Tebian Electrotechnical Co., Ltd., Xinjiang

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Owner name: TEBIAN ELECTRIC APPARATUS STOCK CO., LTD.

Free format text: FORMER NAME OR ADDRESS: XINJIANG TBEA ELECTRICAL CO., LTD.

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