CN103777046A - Intelligent control device for multi-transformation ratio current transformer - Google Patents
Intelligent control device for multi-transformation ratio current transformer Download PDFInfo
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- CN103777046A CN103777046A CN201310541940.7A CN201310541940A CN103777046A CN 103777046 A CN103777046 A CN 103777046A CN 201310541940 A CN201310541940 A CN 201310541940A CN 103777046 A CN103777046 A CN 103777046A
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- 238000012545 processing Methods 0.000 claims abstract description 14
- HPDFFVBPXCTEDN-UHFFFAOYSA-N copper manganese Chemical compound [Mn].[Cu] HPDFFVBPXCTEDN-UHFFFAOYSA-N 0.000 claims description 12
- 238000005070 sampling Methods 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000009466 transformation Effects 0.000 abstract description 5
- 230000005611 electricity Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
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- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
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Abstract
The invention belongs to the field of high-voltage electric energy metering equipment, and particularly discloses an intelligent control device for a multi-transformation ratio current transformer. The intelligent control device comprises a parameter module, a central processing module, a storage module, an input module, a display module, a current adjusting multiple module and a current switching transformation ratio module. The intelligent control device further comprises a power supply module providing a working power supply for the intelligent control device. The central processing module is connected with the other modules, secondary current of the multi-transformation ratio current transformer is connected to the input ends of the parameter module, the current adjusting multiple module and the current switching transformation ratio module, and the output ends of the current adjusting multiple module and the current switching transformation ratio module are connected to the input end of a metering ammeter. The intelligent control device disclosed by the invention can output normal electric signals so as to be metered by an electric energy meter under the condition that the current transformer is in a state of no-load, underload or overload, thereby ensuring a metering result to be accurate, and further being capable of preventing the current transformer from burning relevant metering equipment because of poor overload capacity resulting in a power failure accident.
Description
Technical field
The invention belongs to high-voltage electric energy measurement apparatus field, specifically disclose a kind of variable specific current transformer intelligent controlling device.
Background technology
For a long time, the current ratio that is calculated single no-load voltage ratio and customized current transformer by transformer capacity is continued to use in electric system high pressure measurement always, and current transformer load total current more approaches its ratings, and measuring accuracy is just higher.When loading range is larger, load total current variation range is also larger, when load total current higher than ratings 120% time (now operation of current transformers is in overload), because can making measuring accuracy, the reasons such as magnetic saturation obviously reduce, in the poor situation of part current transformer overload capacity, the even relevant metering outfit of possibility scaling loss, and then cause regional power outage; When load total current lower than current transformer ratings 20% time (now operation of current transformers is in light condition), due to reasons such as resolution step-downs, also can make error in dipping greatly increase, very person cannot measure out.
In sum, provide one can make current transformer under low year, underloading, overload duty, export normal electric signal watt-hour meter metering, the control device that improves current transformer overload capacity becomes those skilled in the art needs the problem of solution badly.
Summary of the invention
The object of the present invention is to provide one can make current transformer under low year, underloading, overload duty, export normal electric signal watt-hour meter metering, improve the control device of current transformer overload capacity, for achieving the above object, technical scheme of the present invention is: a kind of variable specific current transformer intelligent controlling device, comprise: parameter module, central processing module, memory module, load module, display module, electric current are adjusted multiple module, current switching no-load voltage ratio module, and being also included as described intelligent controlling device provides the power module of working power; Described central processing module is connected with each module, described variable specific current transformer secondary current connects described parameter module, electric current is adjusted multiple module, current switching no-load voltage ratio module input, and described electric current is adjusted the current input terminal of multiple module, electrical source exchange no-load voltage ratio module output terminal connection metering ammeter.
Preferably, described parameter module comprises the copper-manganese sampling resistor and the A/D modular converter that connect successively.
Preferably, two described variable specific current transformers are connected to A, C phase, it is described variable specific current transformer secondary current S1, S2, S3 line access respectively described intelligent controller s1, s2, s3 input end through auxiliary reclay that described electric current is adjusted multiple module, the 2-5 that described variable specific current transformer secondary side output current large velocity ratio is little no-load voltage ratio doubly, in little no-load voltage ratio S1 circuit, be provided with the second current transformer adapting with large velocity ratio, described the second Current Transformer Secondary electric current, through copper-manganese sampling resistor, amplifying circuit, A/D conversion, is connected to gauging table.
Preferably, two described variable specific current transformers are connected to A, C phase, described current switching no-load voltage ratio module is that described variable specific current transformer secondary current S1, S2, S3 line are changed through copper-manganese sampling resistor, auxiliary reclay, amplifying circuit, A/D, is connected to gauging table.
beneficial effect
Owing to having adopted technique scheme, the present invention compared with prior art advantage is: adopt variable specific current transformer, and select to switch no-load voltage ratio output and adjust two kinds of patterns of multiple output according to user's user demand or loading condition, wherein adjust multiple output mode and adopt the metering of monolithic ammeter, variable specific current transformer and the second operation of current transformers are in same multiplying power, minimizing interference from human factor is checked meter simple and convenient, improves the accuracy of metering result; Switch no-load voltage ratio output mode and adopt two ammeter meterings, load during lower than rated capacity 10% S1, the S2 access ammeter 1 that puts into operation measure, load while exceeding rated capacity 20% S1, the S3 access ammeter 2 that puts into operation measure, two ammeter multiplying powers and load condition adapt, metering result can be reacted the electricity consumption situation by electric unit underload and overload intuitively, is convenient to further power supply unit and carries out data statistic analysis.In the situations such as variable specific current transformer intelligent controlling device of the present invention is in underload, overload, and load variations is large, and electricity consumption is seasonal strong, can automatically switch to reasonable no-load voltage ratio, effectively reduce the safety of line loss, assurance measuring accuracy and metering outfit.
Adopt 6, the transformer of 1250 kVA in one in experiment, the nominal transformation ratio of corresponding current transformer is 500/5, analogue transformer moves at little electric current (5%) state for a long time in zero load or light condition, current transformer for a long time, the 1-3 month, 11-12 month line loss are 11.2% by statistics, the 4-5 month, 9-10 month line loss are 17%, 6-8 month line loss is 12.8%, after install the current transformer of a 100-500/5A polytropic ratio and the operation of described variable specific current transformer intelligent controlling device additional after one month, line loss is reduced to 3.0%.
Adopt 8, the transformer of 1250 kVA in two in experiment, corresponding current transformer ratio is 75/5; 5, the transformer of 1000 kVA, corresponding current transformer ratio is 60/5; 1, the transformer of 800 kVA, corresponding current transformer ratio is 50/5; 1, the transformer of 630 kVA, corresponding current transformer ratio is 40/5, and simulate day load variations is large, the overload time is long, and evening is without electricity consumption, no-load transformer, the state that electricity consumption seasonality is strong, monthly line loss remains on 8.5% to 10.2% by statistics.After each single transformation ratio current transformer is changed to respectively to 20-100/5,15-75/5,15-75/5,10-50/5 variable specific current transformer equipped described variable specific current transformer intelligent controlling device, line loss is reduced to 4.1%.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention;
Fig. 2 is that electric current of the present invention is adjusted multiple output connection figure;
Fig. 3 is that electric current of the present invention is adjusted Multiple Principle figure;
Fig. 4 is current switching no-load voltage ratio output connection figure of the present invention;
Fig. 5 is current switching no-load voltage ratio output principle figure of the present invention;
Fig. 6 is electrical schematic diagram of the present invention.
Specific embodiment
Below in conjunction with specific embodiment, structure of the present invention and principle are described further, as shown in Figure 1, the present invention includes: parameter module, central processing module, memory module, load module, display module, electric current are adjusted multiple module, current switching no-load voltage ratio module, and being also included as described intelligent controlling device provides the power module of working power; Described central processing module is connected with each module, described variable specific current transformer secondary current connects described parameter module, electric current is adjusted multiple module, current switching no-load voltage ratio module input, and described electric current is adjusted the current input terminal of multiple module, electrical source exchange no-load voltage ratio module output terminal connection metering ammeter.Described parameter module comprises the copper-manganese sampling resistor and the A/D modular converter that connect successively further; Described memory module is for preserving the input/output information of load module and central processing module, described load module is for the working value of tested electric current, the input of action moment setting value, described display module is for the demonstration of correlation parameter and state of a control, and described power module is used for providing AC220V or AC110V working power.
Variable specific current transformer secondary line accesses the copper-manganese sampling resistor input end of described intelligent controlling device, current signal is become to voltage signal and transfers to A/D modular converter, A/D modular converter voltage signal change into digital signal for central processing module computing and with memory module in the parameter set compare, export two kinds of control models, wherein adjust multiple output mode and adopt the metering of monolithic ammeter, variable specific current transformer and the second operation of current transformers are in same multiplying power, reducing interference from human factor checks meter simple and convenient, improve the accuracy of metering result, switch no-load voltage ratio output mode and adopt two ammeter meterings, load during lower than rated capacity 10% S1, the S2 access ammeter 1 that puts into operation measure, load while exceeding rated capacity 20% S1, the S3 access ammeter 2 that puts into operation measure, two ammeter multiplying powers and load condition adapt, metering result can be reacted the electricity consumption situation by electric unit underload and overload intuitively, be convenient to further power supply unit and carry out data statistic analysis, with the actual power consumption of electric unit be: the large multiplying power of number of degrees * of the little multiplying power+ammeter 2 of number of degrees * of ammeter 1.
Be the first pattern mode of connection as shown in Figure 2, electric current is adjusted 2-5 and is doubly exported, when electric current is adjusted after the instruction that multiple module receives that central processing module sends, the multiple to same large velocity ratio of the second current transformer of automatic adjustment described intelligent controlling device inside and outside variable specific current transformer, and guarantee the reasonable of current transformer ratio, output current signal is for the metering of monolithic ammeter.As shown in accompanying drawing 3 and accompanying drawing 6, outside variable specific current transformer is connected to A, C phase, it is described variable specific current transformer secondary current S1 that described electric current is adjusted multiple module, S2, S3 line accesses respectively the s1 of described intelligent controller through auxiliary reclay, s2, s3 input end, described variable specific current transformer secondary side output current large velocity ratio (S1, S3) be little no-load voltage ratio (S1, S2) 2-5 doubly, in little no-load voltage ratio S1 circuit, be provided with the 2-5 that adapts with large velocity ratio doubly (10/5, 15/5, 20/5, 25/5) the second current transformer, described the second Current Transformer Secondary electric current is through copper-manganese sampling resistor, amplifying circuit, A/D modular converter is connected to gauging table.Electric current in tested s1, by after copper-manganese sampling resistor, is sensed as light current and presses, and is adjusted into the required measuring voltage 0-3V of A/D modular converter through amplifying circuit, judges, controls intermediate relay ZJ by central processing module.Exceed rated capacity 20% when tested electric current is greater than 1A(load) time, the closed access of variable specific current transformer S1, S3 gauging table; Tested electric current is less than 0.5A(and loads lower than rated capacity 10%) time, variable specific current transformer S1, S2 closure, inner described the second current transformer is adjusted into multiplying power access gauging table identical with S1, S3.
Be the second pattern mode of connection as shown in Figure 4, the output of current switching no-load voltage ratio, when current switching no-load voltage ratio module is received after the instruction that central processing module sends, automatic switchover current transformer ratio (the corresponding metering ammeter of each no-load voltage ratio), and guarantee the reasonable of current transformer ratio, in the time that the no-load voltage ratio of certain switching is moved, other no-load voltage ratios are closed automatically.As shown in accompanying drawing 5 and accompanying drawing 6, outside variable specific current transformer is connected to A, C phase, and described current switching no-load voltage ratio module is that described variable specific current transformer secondary current S1, S2, S3 line are connected to gauging table through copper-manganese sampling resistor, auxiliary reclay, amplifying circuit, A/D modular converter.Electric current in tested s1, by after copper-manganese sampling resistor, is sensed as light current and presses, and is adjusted into the required measuring voltage 0-3V of A/D modular converter through amplifying circuit, judges, controls intermediate relay ZJ by central processing unit.Exceed rated capacity 20% when tested electric current is greater than 1A(load) time, make S1, S3 closure, gauging table 1 operation metering; Tested electric current is less than 0.5A(and loads lower than rated capacity 10%) time, auxiliary reclay contact S1, S2 closure, gauging table 2 operation meterings, calculate according to " the large multiplying power of number of degrees * of the little multiplying power+ammeter 2 of number of degrees * of ammeter 1 " by electric unit electricity consumption situation, metering result can be reacted the electricity consumption situation by electric unit underload and overload intuitively, is convenient to further power supply unit and carries out data statistic analysis.
It should be noted that term " first ", " second " are only for describing object herein, and can not be interpreted as indication or hint relative importance, for the ordinary skill in the art, can understand above-mentioned term concrete meaning in the present invention depending on concrete condition.
Applied specific embodiment herein principle of the present invention and embodiment are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof.The above is only the preferred embodiment of the present invention, should be understood that, due to the finiteness of literal expression, and objectively there is unlimited concrete structure, for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvement, retouching or variation, also above-mentioned technical characterictic can be combined by rights; These improve retouching, change or combination, or without improving, the design of invention and technical scheme are directly applied to other occasion, all should be considered as protection scope of the present invention.
Claims (4)
1. a variable specific current transformer intelligent controlling device, it is characterized in that, comprise: parameter module, central processing module, memory module, load module, display module, electric current are adjusted multiple module, current switching no-load voltage ratio module, and being also included as described intelligent controlling device provides the power module of working power; Described central processing module is connected with each module, described variable specific current transformer secondary current connects described parameter module, electric current is adjusted multiple module, current switching no-load voltage ratio module input, and described electric current is adjusted the current input terminal of multiple module, electrical source exchange no-load voltage ratio module output terminal connection metering ammeter.
2. a kind of variable specific current transformer intelligent controlling device according to claim 1, is characterized in that, described parameter module comprises the copper-manganese sampling resistor and the A/D modular converter that connect successively.
3. a kind of variable specific current transformer intelligent controlling device according to claim 1, it is characterized in that, two described variable specific current transformers are connected to A, C phase, it is described variable specific current transformer secondary current S1 that described electric current is adjusted multiple module, S2, S3 line accesses respectively the s1 of described intelligent controller through auxiliary reclay, s2, s3 input end, the 2-5 that described variable specific current transformer secondary side output current large velocity ratio is little no-load voltage ratio doubly, in little no-load voltage ratio S1 circuit, be provided with the second current transformer adapting with large velocity ratio, described the second Current Transformer Secondary electric current is through copper-manganese sampling resistor, amplifying circuit, A/D conversion, be connected to gauging table.
4. a kind of variable specific current transformer intelligent controlling device according to claim 1, it is characterized in that, two described variable specific current transformers are connected to A, C phase, described current switching no-load voltage ratio module is that described variable specific current transformer secondary current S1, S2, S3 line are changed through copper-manganese sampling resistor, auxiliary reclay, amplifying circuit, A/D, is connected to gauging table.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310541940.7A CN103777046B (en) | 2013-11-06 | 2013-11-06 | Variable specific current transformer intelligent controlling device |
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| CN201310541940.7A CN103777046B (en) | 2013-11-06 | 2013-11-06 | Variable specific current transformer intelligent controlling device |
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| CN103777046A true CN103777046A (en) | 2014-05-07 |
| CN103777046B CN103777046B (en) | 2016-08-17 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995165A (en) * | 2014-06-04 | 2014-08-20 | 国网河南省电力公司南阳供电公司 | Automatic adjusting device and adjusting method for multi-transformation ratio current transformer |
| CN106771497A (en) * | 2017-01-12 | 2017-05-31 | 北京合锐清合电气有限公司 | Load self-adapting current measurement and protection device and its control method |
| CN107887880A (en) * | 2017-12-13 | 2018-04-06 | 丽水学院 | A kind of Intelligent single-phase electricity consumption identification protecting controller and its control method |
| CN110908285A (en) * | 2019-12-10 | 2020-03-24 | 国网山西省电力公司长治供电公司 | Adaptive control system of composite transformation ratio current transformer |
| CN113341218A (en) * | 2021-07-08 | 2021-09-03 | 广东电网有限责任公司 | Direct current electric energy meter with self-adaptive regulation of measuring range and control method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103995165A (en) * | 2014-06-04 | 2014-08-20 | 国网河南省电力公司南阳供电公司 | Automatic adjusting device and adjusting method for multi-transformation ratio current transformer |
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| CN107887880A (en) * | 2017-12-13 | 2018-04-06 | 丽水学院 | A kind of Intelligent single-phase electricity consumption identification protecting controller and its control method |
| CN107887880B (en) * | 2017-12-13 | 2024-01-30 | 丽水学院 | Intelligent single-phase power consumption identification protection controller and control method thereof |
| CN110908285A (en) * | 2019-12-10 | 2020-03-24 | 国网山西省电力公司长治供电公司 | Adaptive control system of composite transformation ratio current transformer |
| CN113341218A (en) * | 2021-07-08 | 2021-09-03 | 广东电网有限责任公司 | Direct current electric energy meter with self-adaptive regulation of measuring range and control method thereof |
| CN113341218B (en) * | 2021-07-08 | 2022-09-27 | 广东电网有限责任公司 | Direct current electric energy meter with self-adaptive regulation of measuring range and control method thereof |
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| CN103777046B (en) | 2016-08-17 |
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