CN103094881B - A kind of digital transformer protection supervisory equipment - Google Patents
A kind of digital transformer protection supervisory equipment Download PDFInfo
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- CN103094881B CN103094881B CN201210543734.5A CN201210543734A CN103094881B CN 103094881 B CN103094881 B CN 103094881B CN 201210543734 A CN201210543734 A CN 201210543734A CN 103094881 B CN103094881 B CN 103094881B
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Abstract
The invention discloses a kind of digital transformer protection supervisory equipment, include three groups of current transformer sampling circuits, three groups of current transformer sampling circuits are respectively connected to an AD sample circuit, the signal output part of three AD sample circuits accesses PowPC, PowPC is connected to input logic control circuit, output logic control circuit, Ethernet control circuit, the signal input part of input logic control circuit is connected to direct current and opens entry loop, entry loop is opened in exchange, the signal output part of output logic control circuit is connected to action outlet loop, alarm outlet loop, PowPC is also circumscribed with LCD liquid crystal display interface, audible alarm exports, keyboard and interface thereof.Present configuration is simple, and integrated level is high, and sampling precision is high, and the range of linearity is wide, fast response time, and adaptive capacity to environment is strong, low in energy consumption, simple to operate, supports that exchange is opened simultaneously and opens into two kinds of sample modes into direct current, has significant economic benefit and social benefit.<!--1-->
Description
Technical field:
The present invention relates to a kind of microcomputer protecting device, particularly to a kind of digital transformer protection supervisory equipment for 110KV and the double-round of following electric pressure, three coil transformer protections.
Background technology:
Power transformer is electrical equipment important in power plant and transformer station, and the safe operation ensureing power system is had very important significance by the reliability improving transformator work.The transformator produced at present is structurally reliable, and fault chance is less, but it is possible to there is various types of fault and irregular operating mode in actual motion.In order to ensure that power system security runs continuously; and the impact of power system is controlled at minimum zone by fault and irregular operating mode, it is necessary to configure necessity, functional and reliable in action protective relaying device according to the capacitance grade of transformator and significance level.
The fault of transformator can be divided into internal fault and external fault two kinds.Internal fault refers to the fault occurred inside oil tank of transformer, mainly the phase fault of winding, single-phase turn-to-turn short circuit, single-line to ground fault etc..It is breakneck that internal fault occurs, because the high-temperature electric arc that short circuit current produces not only can damage the insulation of winding, burn iron core, and insulant and transformer oil produce a large amount of gas because of decomposes, oil tank of transformer is likely caused to explode, therefore, when power transformer interior fault, it is necessary to promptly excised.The common external fault of transformator is mainly the turn-to-turn short circuit etc. of the phase fault on transformator lead-out wire, single-line to ground fault and winding, needs also exist for protective relaying device and makes and processing timely.
Summary of the invention:
For the various faults that transformator is likely to occur, the invention provides a kind of digital transformer protection supervisory equipment.
The technical solution used in the present invention is:
A kind of digital transformer protection supervisory equipment, it is characterized in that: include three groups of current transformer sampling circuits, three groups of current transformer sampling circuits are respectively connected to an AD sample circuit, the signal output part of three AD sample circuits accesses PowPC, PowPC is connected to input logic control circuit, output logic control circuit, Ethernet control circuit, the signal input part of input logic control circuit is connected to direct current and opens entry loop, entry loop is opened in exchange, the signal output part of output logic control circuit is connected to action outlet loop, alarm outlet loop, PowPC is also circumscribed with LCD liquid crystal display interface, audible alarm exports, keyboard and interface thereof；The CT secondary current of one group of high voltage side of transformer, the CT secondary current of one group of transformator medium voltage side, one group of step down side CT secondary current be respectively connected to described three group current transformer sampling circuit, each current transformer sampling circuit converts current signal to small-signal current respectively, it is adjusted to digital signal then through AD sample circuit and is linked into PowPC, PowPC carries out FFT rapid computations, calculate three side current effective values in real time, and calculate jump-value of current in 1/4 cycle；Circuit breaker position, handcart work testing position, earthing position etc. is opened and is linked into direct current into signal and opens entry loop or entry loop is opened in exchange, and carry out blood pressure lowering through input logic control circuit, after removing of ac, it is changed into stable direct current 5V voltage small-signal, it is linked into PowPC, PowPC detects in real time and opens into sampled value, PowPC carries out relay protective scheme judgement by calculating the current value obtained, realize differential quick-break, the biased differential protection of secondary harmonic brake, and in transformator, the defencive functions such as the stream excessively of the CT secondary current of low-pressure side, and by the open tripping operation outlet of action outlet loop, on LCD liquid crystal display interface, show fault message and secondary current value simultaneously, buzzer is driven by warning outlet loop, send alarm sound；PowPC is also by Ethernet control circuit, it is achieved the reception of TCP/UDP message and transmission.
Described a kind of digital line protection measure and control device, it is characterised in that: for inserter structure, it is made up of cpu motherboard, liquid crystal panel, bus board, current sample plate, input and output panel, ethernet communication plate totally 6 pieces of circuit boards；Liquid crystal panel includes LCD LCD MODULE, keyboard and interface thereof and audible alarm output；Cpu motherboard includes PowPC chip, AD sample circuit, input logic control circuit, output logic control circuit and bottom layer driving circuit, and wherein PowPC adopts 32 FreeScale chips；Current sample plate comprises three groups of current transformer sampling circuits and an installation's power source module；Input and output panel includes action outlet loop, alarm outlet loop, entry loop is opened in exchange, direct current opens entry loop and relay operation loop；Ethernet communication plate includes Ethernet and processes circuit.
The beneficial effects of the present invention is:
1, apparatus structure is simple, and integrated level is high, gathers current and voltage data by external 12 A/D chip, and sampling precision is high, and the range of linearity is wide, and fast response time, adaptive capacity to environment is strong and cost performance is high.
2, support that exchange is opened into opening into two kinds of sample modes with direct current simultaneously, support two kinds of operation circuits of AC and DC.
3, support Dual-Ethernet communication modes, support TCP/UDP procotol, support multiple power communication stipulations.
Accompanying drawing illustrates:
Fig. 1 is the schematic block circuit diagram of the present invention.
Fig. 2 is the population structure schematic diagram of the present invention.
Drawing reference numeral illustrates:
310 bus boards；311 liquid crystal panels；312 current sample plates；314 cpu motherboards；313 input and output panels；315 ethernet communication plates；
610 PowPC chips；611 keyboards and interface thereof；612 audible alarm outputs；613 output logic control circuits；614 warning outlet loops；615 action outlet loops；616 direct currents open entry loop；Entry loop is opened in 617 exchanges；618 current transformer loops 1；619 current transformer loops 2；620 current transformer loops 3；621 AD sample circuits；622 multiple power source modules；623 LCD liquid crystal displays；625 input logic control circuits.
Detailed description of the invention:
Consult shown in Fig. 1, a kind of digital transformer protection supervisory equipment, include three groups of current transformer sampling circuits 618, 619 and 620, three groups of current transformer sampling circuits 618, 619 and 620 are respectively connected to an AD sample circuit 621, the signal output part of three AD sample circuits 621 accesses PowPC610, PowPC610 is connected to input logic control circuit 625, output logic control circuit 613, Ethernet control circuit 624, the signal input part of input logic control circuit 625 is connected to direct current and opens entry loop 616, entry loop 617 is opened in exchange, the signal output part of output logic control circuit 613 is connected to action outlet loop 615, alarm outlet loop 614, PowPC610 is also circumscribed with LCD liquid crystal display interface 623, audible alarm output 612, keyboard and interface 611 thereof；The secondary current of three groups of CT is linked into three groups of current transformer sampling circuits 618,619 and 620, current transformer sampling circuit converts current signal to small-signal current, it is adjusted to digital signal through AD sample circuit 621 and is linked into PowPC610, PowPC610 gathers 32 data points in a cycle, carry out FFT computing, utilize full wave Fourier algorithm, elimination higher hamonic wave, extract fundametal compoment, calculate three groups of current effective values and jump-value of current in real time.Circuit breaker position, handcart work testing position, earthing position etc. open into signal be linked into direct current open entry loop 616 or exchange open entry loop 617, and through input logic control circuit 625, after carrying out blood pressure lowering, removal of ac, it is changed into stable direct current 5V voltage small-signal, it is linked into PowPC610, PowPC610 utilizes 1ms timer interruption, and detection in real time is opened into sampled value.PowPC610 carries out relay protective scheme judgement by calculating the current value obtained; realize the biased differential protection of differential quick-break, secondary harmonic brake; in, downside cross the defencive functions such as stream; and by the open tripping operation outlet of action outlet loop 615; on LCD liquid crystal display interface 623, show fault message and secondary current value simultaneously; drive buzzer by alerting outlet loop 614, send alarm sound.PowPC610 is also by Ethernet control circuit 624, it is achieved the reception of TCP/UDP message and transmission.
Consulting shown in Fig. 2, the present invention is inserter structure, is made up of liquid crystal panel 311, bus board 310, cpu motherboard 314, current sample plate 312, input and output panel 313, ethernet communication plate 315 totally 6 pieces of circuit boards.Liquid crystal panel 311 comprises LCD liquid crystal display interface 623, keyboard and interface 611 thereof and audible alarm output 612, is mainly used in man-machine interaction, and simple, intuitive is understandable is its principal character；Cpu motherboard 314 comprises FreeScale chip 610, AD sample circuit 621, input and output logic control circuit 625 and 613 and bottom layer driving circuit, circuit board adopts 4 layers of design, anti-interference is the key process unit of whole device by force, is responsible for the process of various logic criterion；Current sample plate 312 comprises three groups of current transformer sampling circuits 617,618,619 and installation's power source module 622, and the sampling being responsible for 3 groups of CT secondary currents of transformator accesses, and provides the working power of device；Input and output panel 313 comprises alarm outlet loop 614, action outlet loop 615, alternating current-direct current are opened into control circuit 616,617, is responsible for the sampling of position signalling and accesses and the on-off control of action outlet；Ethernet communication plate 315 includes Ethernet control circuit 624, it is achieved Ethernet TCP/UDP network communication function.
Present configuration is simple; integrated level is high; sampling precision is high; the range of linearity is wide, fast response time, and adaptive capacity to environment is strong, low in energy consumption, simple to operate, supports that exchange is opened into opening into two kinds of sample modes with direct current simultaneously; integrate multi-protective function; as the main protection of 110KV and the double-round of following electric pressure, three coil transformers, there is significant economic benefit and social benefit, be successfully applied in multiple project at present.
Claims (2)
1. a digital transformer protection supervisory equipment, it is characterized in that: include three groups of current transformer sampling circuits, three groups of current transformer sampling circuits are respectively connected to an AD sample circuit, the signal output part of three AD sample circuits accesses PowPC chip, PowPC chip is connected to input logic control circuit, output logic control circuit, Ethernet control circuit, the signal input part of input logic control circuit is connected to direct current and opens entry loop, entry loop is opened in exchange, the signal output part of output logic control circuit is connected to action outlet loop, alarm outlet loop, PowPC chip is also circumscribed with LCD liquid crystal display interface, audible alarm exports, keyboard and interface thereof；The CT secondary current of one group of high voltage side of transformer, the CT secondary current of one group of transformator medium voltage side, one group of step down side CT secondary current be respectively connected to described three group current transformer sampling circuit, each current transformer sampling circuit converts current signal to small-signal current respectively, it is adjusted to digital signal then through AD sample circuit and is linked into PowPC chip, PowPC chip carries out FFT rapid computations, calculate three side current effective values in real time, and calculate jump-value of current in 1/4 cycle；Circuit breaker position, handcart work testing position, earthing position is opened and is linked into direct current into signal and opens entry loop or entry loop is opened in exchange, and carry out blood pressure lowering through input logic control circuit, after removing of ac, it is changed into stable direct current 5V voltage small-signal, it is linked into PowPC chip, PowPC chip detects in real time to be opened into sampled value, PowPC chip carries out relay protective scheme judgement by calculating the current value obtained, realize differential quick-break, the biased differential protection of secondary harmonic brake, and in transformator, the overcurrent protection function of the CT secondary current of low-pressure side, and by the open tripping operation outlet of action outlet loop, on LCD liquid crystal display interface, show fault message and secondary current value simultaneously, buzzer is driven by alerting outlet loop, send alarm sound；PowPC chip is also by Ethernet control circuit, it is achieved the reception of TCP/UDP message and transmission.
2. a kind of digital transformer protection supervisory equipment according to claim 1, it is characterised in that: for inserter structure, it is made up of cpu motherboard, liquid crystal panel, bus board, current sample plate, input and output panel, ethernet communication plate totally 6 pieces of circuit boards；Liquid crystal panel includes LCD liquid crystal display interface, keyboard and interface thereof and audible alarm output；Cpu motherboard includes PowPC chip, AD sample circuit, input logic control circuit, output logic control circuit and bottom layer driving circuit, and wherein PowPC chip adopts 32 FreeScale chips；Current sample plate comprises three groups of current transformer sampling circuits and an installation's power source module；Input and output panel includes action outlet loop, alarm outlet loop, entry loop is opened in exchange, direct current opens entry loop and relay operation loop；Ethernet communication plate includes Ethernet control circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210543734.5A CN103094881B (en) | 2012-12-14 | 2012-12-14 | A kind of digital transformer protection supervisory equipment |
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| CN201210543734.5A CN103094881B (en) | 2012-12-14 | 2012-12-14 | A kind of digital transformer protection supervisory equipment |
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| CN103094881A CN103094881A (en) | 2013-05-08 |
| CN103094881B true CN103094881B (en) | 2016-06-29 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104635100A (en) * | 2013-11-08 | 2015-05-20 | 国家电网公司 | Method of testing transformer before commissioning of intelligent substation |
| CN104635099A (en) * | 2013-11-08 | 2015-05-20 | 国家电网公司 | Transformer detector before commissioning of intelligent substation |
| CN105071345A (en) * | 2015-07-31 | 2015-11-18 | 西安交通大学 | Differential protection hardware circuit with percentage differential and implementation method of differential protection hardware circuit |
| CN108155716A (en) * | 2016-12-02 | 2018-06-12 | 宜兴市森维电子有限公司 | A kind of Intelligent distribution transformer protection supervisory equipment |
| CN108594012A (en) * | 2018-07-05 | 2018-09-28 | 滁州安瑞电力自动化有限公司 | A kind of motor protection measure and control device having electric energy acquisition function |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7140237B2 (en) * | 2004-04-07 | 2006-11-28 | Hitachi Industrial Equipment Systems Co., Ltd. | Transformer monitoring system |
| CN201142561Y (en) * | 2007-10-31 | 2008-10-29 | 虎牌控股集团有限公司 | Digital line protection device |
| CN201278459Y (en) * | 2008-09-27 | 2009-07-22 | 山西南自晋能自动化成套有限公司 | Digital transformer protection apparatus |
| CN102664390A (en) * | 2012-05-22 | 2012-09-12 | 普尔盾电气（上海）有限公司 | Digital general protection observing and controlling device |
| CN203135404U (en) * | 2012-12-14 | 2013-08-14 | 滁州安瑞电力自动化有限公司 | Digital transformer protection, monitoring and control apparatus |
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- 2012-12-14 CN CN201210543734.5A patent/CN103094881B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7140237B2 (en) * | 2004-04-07 | 2006-11-28 | Hitachi Industrial Equipment Systems Co., Ltd. | Transformer monitoring system |
| CN201142561Y (en) * | 2007-10-31 | 2008-10-29 | 虎牌控股集团有限公司 | Digital line protection device |
| CN201278459Y (en) * | 2008-09-27 | 2009-07-22 | 山西南自晋能自动化成套有限公司 | Digital transformer protection apparatus |
| CN102664390A (en) * | 2012-05-22 | 2012-09-12 | 普尔盾电气（上海）有限公司 | Digital general protection observing and controlling device |
| CN203135404U (en) * | 2012-12-14 | 2013-08-14 | 滁州安瑞电力自动化有限公司 | Digital transformer protection, monitoring and control apparatus |
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Inventor after: Cai Yong Inventor before: Liu Rongtang Inventor before: Cai Yong Inventor before: Li Peng Inventor before: Dai Lizhi |
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