CN103777046B - Variable specific current transformer intelligent controlling device - Google Patents
Variable specific current transformer intelligent controlling device Download PDFInfo
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- CN103777046B CN103777046B CN201310541940.7A CN201310541940A CN103777046B CN 103777046 B CN103777046 B CN 103777046B CN 201310541940 A CN201310541940 A CN 201310541940A CN 103777046 B CN103777046 B CN 103777046B
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Abstract
The invention belongs to high-voltage electric energy measurement apparatus field, specifically disclose a kind of variable specific current transformer intelligent controlling device, including: parameter module, central processing module, memory module, input module, display module, electric current adjust multiple module, current switching no-load voltage ratio module, also include the power module providing working power for described intelligent controlling device.Described central processing module is connected with each module, described variable specific current transformer secondary current connects described parameter module, electric current adjusts multiple module, current switching no-load voltage ratio module input, and described electric current adjusts multiple module, the current input terminal of current switching no-load voltage ratio module output connection metering ammeter.The present invention all can export the normal signal of telecommunication in the case of current transformer zero load, underloading or overload and measure for electric energy meter, guarantee the accurate of metric results, can prevent current transformer from causing burning the power outage that relevant measuring equipment causes because of overload capacity difference further.
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, power system high pressure measurement is continued to use always and is calculated single no-load voltage ratio by transformer capacity and customize the current ratio of current transformer, and current transformer load total current is closer to its rated value, and measuring accuracy is the highest.When loading range is bigger, load total current excursion is the biggest, when load total current is higher than the 120% of rated value (now operation of current transformers is in overload), owing to the reasons such as magnetic saturation can make measuring accuracy substantially reduce, in the case of portion of electrical current transformer overload capacity is poor, possibly even scaling loss is correlated with measuring equipment, and then causes regional power outage；When load total current is less than the 20% of current transformer rated value (now operation of current transformers is in light condition), due to reasons such as resolution ratio step-downs, error in dipping also can be made to be greatly increased, notably cannot measure out.
In sum, it is provided that one can make current transformer be under low load, underloading, overload work state and export the metering of normal signal of telecommunication watt-hour meter, the device that controls improving current transformer overload capacity becomes the problem that those skilled in the art need solution badly.
Summary of the invention
It is an object of the invention to provide one and current transformer can be made to be under low load, underloading, overload work state export the metering of normal signal of telecommunication watt-hour meter, improve the control device of current transformer overload capacity, for reaching above-mentioned purpose, the technical scheme is that a kind of variable specific current transformer intelligent controlling device, including: parameter module, central processing module, memory module, input module, display module, electric current adjust multiple module, current switching no-load voltage ratio module, also include the power module providing working power for described intelligent controlling device；Described central processing module is connected with each module, described variable specific current transformer secondary current connects described parameter module, electric current adjusts multiple module, current switching no-load voltage ratio module input, and described electric current adjusts multiple module, the current input terminal of power supply switching no-load voltage ratio module output connection metering ammeter.
Preferably, described parameter module includes copper-manganese sampling resistor and the A/D modular converter being sequentially connected with.
Preferably, two described variable specific current transformers are connected to A, C phase, it is s1, s2, s3 input that described variable specific current transformer secondary current S1, S2, S3 line is respectively connected to described intelligent controller through auxiliary reclay that described electric current adjusts multiple module, described variable specific current transformer secondary side output electric current large velocity ratio is 2-5 times of little no-load voltage ratio, the second current transformer adapted with large velocity ratio it is provided with in little no-load voltage ratio S1 circuit, described second Current Transformer Secondary electric current, through copper-manganese sampling resistor, amplifying circuit, A/D conversion, is connected to gauge 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 is changed through copper-manganese sampling resistor, auxiliary reclay, amplifying circuit, A/D, is connected to gauge table.
Beneficial effect
Owing to have employed technique scheme, the present invention compared with prior art advantage is: use variable specific current transformer, and use demand or loading condition select switching no-load voltage ratio output and adjust multiple output both of which according to user, wherein adjust multiple output mode and use the metering of monolithic ammeter, variable specific current transformer and the second operation of current transformers are in same multiplying power, reduce interference from human factor and check meter simple and convenient, improve the accuracy of metric results；Switching no-load voltage ratio output mode uses two pieces of ammeter meterings, load less than rated capacity 10% time S1, S2 put into operation access ammeter 1 measure, when load exceedes rated capacity 20% S1, S3 put into operation access ammeter 2 measure, two ammeter multiplying powers adapt with load condition, metric results can the electricity consumption situation of the underload of reaction electric unit intuitively and excess load, be easy to power supply unit further and carry out data statistic analysis.Variable specific current transformer intelligent controlling device of the present invention is in underload, excess load, and load variations is big, electricity consumption seasonal strong when can automatically switch to reasonable no-load voltage ratio, effectively reduce line loss, ensure certainty of measurement and the safety of measuring equipment.
6, the transformer of 1250 kVA is used in experiment one, the nominal transformation ratio of corresponding current transformer is 500/5, analogue transformer is in zero load for a long time or light condition, current transformer run in small area analysis (5%) state for a long time, it is 11.2% through the statistics 1-3 month, 11-12 month line loss, 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 additional and after described variable specific current transformer intelligent controlling device runs one month, line loss is reduced to 3.0%.
Using 8, the transformer of 1250 kVA in experiment two, 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 simulation load variations on daytime is big, the excess load time is long, and without electricity consumption, no-load transformer, the state that electricity consumption seasonality is strong, be maintained at 8.5% to 10.2% through adding up monthly line loss in the evening.After each single transformation ratio current transformer changed to respectively 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 the theory diagram of the present invention；
Fig. 2 is that electric current of the present invention adjusts multiple output connection figure；
Fig. 3 is that electric current of the present invention adjusts 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 and the principle of the present invention are described further, as shown in Figure 1, the present invention includes: parameter module, central processing module, memory module, input module, display module, electric current adjust multiple module, current switching no-load voltage ratio module, also includes the power module providing working power for described intelligent controlling device；Described central processing module is connected with each module, described variable specific current transformer secondary current connects described parameter module, electric current adjusts multiple module, current switching no-load voltage ratio module input, and described electric current adjusts multiple module, the current input terminal of power supply switching no-load voltage ratio module output connection metering ammeter.The most described parameter module includes copper-manganese sampling resistor and the A/D modular converter being sequentially connected with；Described memory module is for preserving the input/output information of input module and central processing module, described input module is used for the working value of tested electric current, the input of action moment setting value, described display module is used for relevant parameter and the display of 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 of described intelligent controlling device, current signal is become voltage signal and transmits to A/D modular converter, A/D modular converter is changed into data signal voltage signal and supplies central processing module computing and compare with the parameter of setting in memory module, export two kinds of control models, wherein adjust multiple output mode and use the metering of monolithic ammeter, variable specific current transformer and the second operation of current transformers are in same multiplying power, reduce interference from human factor and check meter simple and convenient, improve the accuracy of metric results；Switching no-load voltage ratio output mode uses two pieces of ammeter meterings, load less than rated capacity 10% time S1, S2 put into operation access ammeter 1 measure, when load exceedes rated capacity 20% S1, S3 put into operation access ammeter 2 measure, two ammeter multiplying powers adapt with load condition, metric results can the electricity consumption situation of the underload of reaction electric unit intuitively and excess load, it is easy to power supply unit further and carries out data statistic analysis, with the actual power consumption of electric unit be: the big multiplying power of number of degrees * of the little multiplying power+ammeter 2 of number of degrees * of ammeter 1.
It is the first pattern mode of connection as shown in Figure 2, electric current adjusts 2-5 times and exports, after electric current adjustment multiple module receives the instruction that central processing module sends, automatically the multiple to same large velocity ratio of the second current transformer within described intelligent controlling device and outside variable specific current transformer is adjusted, and ensureing the reasonable of current transformer ratio, output current signal measures for 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 adjusts multiple module, S2, S3 line is respectively connected to the s1 of described intelligent controller through auxiliary reclay, s2, s3 input, described variable specific current transformer secondary side output electric current large velocity ratio (S1, S3) it is little no-load voltage ratio (S1, S2) 2-5 times, 2-5 times (10/5 adapted with large velocity ratio it is provided with in little no-load voltage ratio S1 circuit, 15/5, 20/5, 25/5) the second current transformer, described second Current Transformer Secondary electric current is through copper-manganese sampling resistor, amplifying circuit, A/D modular converter is connected to gauge table.After electric current in tested s1 passes through copper-manganese sampling resistor, it is sensed as light current pressure, the measurement voltage 0-3V needed for amplifying circuit is adjusted to A/D modular converter, judged by central processing module, control intermediate relay ZJ.When tested electric current exceedes rated capacity 20% more than 1A(load) time, variable specific current transformer S1, S3 Guan Bi accesses gauge table；Tested electric current is less than rated capacity 10% less than 0.5A(load) time, variable specific current transformer S1, S2 Guan Bi, internal described second current transformer is adjusted to multiplying power identical with S1, S3 and accesses gauge table.
It is the second pattern mode of connection as shown in Figure 4, current switching no-load voltage ratio exports, after current switching no-load voltage ratio module receives the instruction that central processing module sends, automatic switchover current transformer ratio (the corresponding one piece of metering ammeter of each no-load voltage ratio), and ensure the reasonable of current transformer ratio, when certain no-load voltage ratio switched is run, other no-load voltage ratios are automatically switched off.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 is connected to gauge table through copper-manganese sampling resistor, auxiliary reclay, amplifying circuit, A/D modular converter.After electric current in tested s1 passes through copper-manganese sampling resistor, it is sensed as light current pressure, the measurement voltage 0-3V needed for amplifying circuit is adjusted to A/D modular converter, judged by central processing unit, control intermediate relay ZJ.When tested electric current exceedes rated capacity 20% more than 1A(load) time so that S1, S3 close, and gauge table 1 runs metering；Tested electric current is less than rated capacity 10% less than 0.5A(load) time, auxiliary reclay contact S1, S2 Guan Bi, gauge table 2 runs metering, calculate according to " the big 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, metric results can the electricity consumption situation of the underload of reaction electric unit intuitively and excess load, be easy to power supply unit further and carry out data statistic analysis.
It should be noted that the terms " first ", " second " are only used for describing purpose, and it is not intended that indicate or hint relative importance, for the ordinary skill in the art, concrete condition can be regarded and understand above-mentioned term concrete meaning in the utility model.
Principle and the embodiment of the present invention are set forth by specific embodiment used herein, and the explanation of above example is only intended to help to understand method and the core concept thereof of the present invention.The above is only the preferred embodiment of the present invention, should be understood that, finiteness due to 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, it is also possible to make some improvement, retouch or change, it is also possible to above-mentioned technical characteristic is combined by rights；These improve retouching, change or combine, or the most improved design by invention and technical scheme directly apply to other occasion, are regarded as protection scope of the present invention.
Claims (3)
1. a variable specific current transformer intelligent controlling device, it is characterized in that, including: parameter module, central processing module, memory module, input module, display module, electric current adjust multiple module, current switching no-load voltage ratio module, also include the power module providing working power for described intelligent controlling device；nullDescribed central processing module is connected with each module，Described variable specific current transformer secondary current connects described parameter module、Electric current adjusts multiple module、Current switching no-load voltage ratio module input，Described electric current adjusts multiple module、Power supply switching no-load voltage ratio module output connects the current input terminal of metering ammeter，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 adjusts multiple module、S2、S3 line is respectively connected to the s1 of described intelligent controller through auxiliary reclay、s2、S3 input，Described variable specific current transformer secondary side output electric current large velocity ratio is 2-5 times of little no-load voltage ratio，The second current transformer adapted with large velocity ratio it is provided with in little no-load voltage ratio S1 circuit，Described second Current Transformer Secondary electric current is through copper-manganese sampling resistor、Amplifying circuit、A/D changes，It is connected to gauge table.
A kind of variable specific current transformer intelligent controlling device, it is characterised in that described parameter module includes copper-manganese sampling resistor and the A/D modular converter being sequentially connected with.
A kind of variable specific current transformer intelligent controlling device, 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 is changed through copper-manganese sampling resistor, auxiliary reclay, amplifying circuit, A/D, is connected to gauge table.
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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 |
| CN106771497B (en) * | 2017-01-12 | 2023-09-26 | 北京合锐清合电气有限公司 | Load self-adaptive current measuring and protecting device and control method thereof |
| CN107887880B (en) * | 2017-12-13 | 2024-01-30 | 丽水学院 | Intelligent single-phase power consumption identification protection controller and control method thereof |
| CN110908285B (en) * | 2019-12-10 | 2023-04-07 | 国网山西省电力公司长治供电公司 | Self-adaptive control system of composite transformation ratio current transformer |
| 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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