CN102169754B - Current and voltage transformer - Google Patents
Current and voltage transformer Download PDFInfo
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- CN102169754B CN102169754B CN201110028244A CN201110028244A CN102169754B CN 102169754 B CN102169754 B CN 102169754B CN 201110028244 A CN201110028244 A CN 201110028244A CN 201110028244 A CN201110028244 A CN 201110028244A CN 102169754 B CN102169754 B CN 102169754B
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Abstract
The invention provides a current and voltage transformer relating to the field of power grids and being invented for monitoring power equipment of a smart grid. The current and voltage transformer comprises a first current transformer and a voltage transformer, wherein the first current transformer comprises a first coil and a first resistor, the first coil is coiled on an iron core and used for enabling a high-voltage transmission line to pass through, two ends of the first coil output current signals for measuring; the first resistor is connected to two ends of the first coil; the voltage transformer comprises a high-voltage arm resistor and a low-voltage arm resistor, the first end of the high-voltage arm resistor is connected with the high-voltage transmission line; and the first end of the low-voltage arm resistor is connected with the earth, the second end of the low-voltage arm resistor is connected with the second end of the high-voltage arm resistor, and voltage signals for measuring are output between the first end and the second end of the low-voltage arm resistor. The invention can be used for managing the smart grid.
Description
Technical field
The present invention relates to the instrument transformer field, be meant a kind of current-voltage transformer especially.
Background technology
The propelling of building along with intelligent grid, how the power equipment to intelligent grid carries out on-line monitoring, becomes problem demanding prompt solution.In the process of construction of intelligent grid, the operational factor of monitoring electrical network in real time is the basis, and electric current and the voltage of measuring high-tension line then are the bases on basis, have only the measurement that has realized voltage and current, could further calculate power, other parameters such as harmonic wave.Present method of measurement mainly is to utilize electromagnetic transformer, and its defective is that the output signal is very strong, and for example current transformer output is 1 ampere of perhaps current signal of 5 amperes, and what voltage transformer was exported is the AC signal of 100V.These output signals can not be directly passed to rear end monitoring equipment instrument, but need carry out secondary conversion, are reduced to the voltage signal about the 5V that electronic equipment can measure to signal, just can carry out analog digital conversion (AD conversion).Like this, owing to increased the secondary conversion, can cause certainty of measurement to reduce; Also make system complicated more, failure rate improves.
Summary of the invention
The technical problem that the present invention will solve provides a kind of current-voltage transformer, can monitor the power equipment of intelligent grid, and the signal of output is smaller, can directly send follow-up monitoring equipment to.
For solving the problems of the technologies described above, embodiments of the invention provide technical scheme following:
On the one hand, a kind of current-voltage transformer is provided, comprises:
First current transformer comprises: first coil on the iron core, and be used to supply high voltage transmission line to pass, the two ends output of said first coil is measured and is used current signal; First resistance is connected the two ends of said first coil;
Voltage transformer comprises: high-voltage arm resistance, and first end of said high-voltage arm resistance is connected with said high voltage transmission line; Low-voltage arm resistance, first end of said low-voltage arm resistance be connected saidly, second end of said low-voltage arm resistance is connected with second end of said high-voltage arm resistance, output is measured and to be used voltage signal between first end of said low-voltage arm resistance and second end.
Said first coil by and around flexible cable, hollow copper tubing or the hollow aluminum pipe of multiple conducting wires, multiple conducting wires braiding process.
Said iron core is made up of the iron based nano crystal carrying material.
The resistance of said first resistance is between 30-100 ohm.
Described current-voltage transformer also comprises: second current transformer comprises:
Second coil on the skeleton is used to supply high voltage transmission line to pass, and current signal is used in two ends output second protection of said second coil; Said second coil is parallel to the said first coil setting; Said skeleton is a nonmagnetic substance;
Second resistance is connected the two ends of said second coil.
The resistance of said high-voltage arm resistance and said low-voltage arm resistance is between 5M Ω-100M Ω.
On the other hand, a kind of current-voltage transformer is provided, comprises:
First current transformer comprises: first coil on the iron core, and be used to supply high voltage transmission line to pass, the two ends output of said first coil is measured and is used current signal; First resistance is connected the two ends of said first coil;
Voltage transformer comprises: high-voltage arm resistance, and first end of said high-voltage arm resistance is connected with said high voltage transmission line; Low-voltage arm resistance, first end of said low-voltage arm resistance be connected saidly, second end of said low-voltage arm resistance is connected with second end of said high-voltage arm resistance, output is measured and to be used voltage signal between first end of said low-voltage arm resistance and second end;
Two hollow circular cylinders; First hollow circular cylinder is arranged on second hollow circular cylinder, and the parallel axes of said first hollow circular cylinder is in ground; The axis normal of said second hollow circular cylinder is in ground;
Said first coil is arranged in the cavity of said first hollow circular cylinder, and said first coil is parallel to the bottom surface of said first hollow circular cylinder, makes said high voltage transmission line pass the cavity and said first coil of said first hollow circular cylinder;
Said first resistance, said high-voltage arm resistance and said low-voltage arm resistance are arranged in the cavity of said second hollow circular cylinder;
Said two hollow circular cylinders are made up of insulating material.
Described current-voltage transformer also comprises: second current transformer comprises: second coil on the skeleton, and be used to supply high voltage transmission line to pass, current signal is used in two ends output second protection of said second coil; Said second coil is parallel to the said first coil setting; Said skeleton is a nonmagnetic substance;
Second resistance is connected the two ends of said second coil;
Said second coil is arranged in the cavity of said first hollow circular cylinder; Said second resistance is arranged in the cavity of said second hollow circular cylinder.
Embodiments of the invention have following beneficial effect:
In the such scheme; A kind of current-voltage transformer is provided; Can distinguish output current signal and voltage signal, can carry out on-line monitoring the power equipment of intelligent grid, compare with prior art in use the method for electromagnetic transformer; The signal of output is smaller, can directly send follow-up monitoring equipment to.
Description of drawings
Fig. 1 is the circuit theory sketch map of described current-voltage transformer for the present invention;
Fig. 2 is the front view of described current-voltage transformer for the present invention;
Fig. 3 is the end view of current-voltage transformer of the present invention;
Fig. 4 is the vertical view of current-voltage transformer of the present invention;
Fig. 5 is the stereogram of current-voltage transformer of the present invention;
Fig. 6 is the application scenarios of current-voltage transformer of the present invention.
Embodiment
For technical problem, technical scheme and advantage that embodiments of the invention will be solved is clearer, will combine accompanying drawing and specific embodiment to be described in detail below.
As shown in Figure 1, the circuit theory sketch map for a kind of current-voltage transformer of the present invention comprises:
First current transformer comprises: first coil 4 on the iron core, and be used to supply high voltage transmission line 1 to pass, the two ends output of said first coil 4 is measured and is used current signal; First resistance 5 is connected the two ends of said first coil 4;
Voltage transformer comprises: high-voltage arm resistance 10, and first end of said high-voltage arm resistance 10 is connected with said high voltage transmission line 1; Low-voltage arm resistance 8, first end of said low-voltage arm resistance 8 be connected saidly, second end of said low-voltage arm resistance 8 is connected with second end of said high-voltage arm resistance 10, output is measured and to be used voltage signal between first end of said low-voltage arm resistance 8 and second end.
Said first coil 7 by and around flexible cable, hollow copper tubing or the hollow aluminum pipe of multiple conducting wires, multiple conducting wires braiding process.
Said iron core is made up of the iron based nano crystal carrying material.
The resistance of said first resistance 8 is between 30-100 ohm.
Described current-voltage transformer also comprises: second current transformer comprises:
Second coil 2 on the skeleton is used to supply high voltage transmission line 1 to pass, and current signal is used in two ends output second protection of said second coil 2; Said second coil 2 is parallel to said first coil 4 and is provided with; Said skeleton is a nonmagnetic substance;
Second resistance 7 is connected the two ends of said second coil.
The resistance of said high-voltage arm resistance 10 and said low-voltage arm resistance 8 is between 5M Ω-100M Ω.
Two group of first current transformer and two groups of voltage transformers have been shown among Fig. 1.
The material object of current-voltage transformer of the present invention is described below in conjunction with Fig. 2 to Fig. 5.Fig. 2 is the front view of current-voltage transformer of the present invention; Fig. 3 is the end view of current-voltage transformer of the present invention; Fig. 4 is the vertical view of current-voltage transformer of the present invention; Fig. 5 is the stereogram of current-voltage transformer of the present invention; Current-voltage transformer comprises:
Two hollow circular cylinders; First hollow circular cylinder 20 is arranged on second hollow circular cylinder 30, and the parallel axes of said first hollow circular cylinder 20 is in ground; The axis normal of said second hollow circular cylinder 30 is in ground;
Said first coil 4 is arranged in the cavity of said first hollow circular cylinder 20; And said first coil 4 is parallel to the bottom surface of said first hollow circular cylinder 20, makes said high voltage transmission line 1 pass the cavity and said first coil 4 of said first hollow circular cylinder 20;
Said first resistance 5, said high-voltage arm resistance 10 and said low-voltage arm resistance 8 are arranged in the cavity of said second hollow circular cylinder 30;
Said two hollow circular cylinders 30,20 are made up of insulating material.
Said second coil 2 is arranged in the cavity of said first hollow circular cylinder 20; Said second resistance 7 is arranged in the cavity of said second hollow circular cylinder 30.
Said voltage transformer also comprises: the bucking electrode (not shown) is arranged on the outside of high-voltage arm resistance 10.
Said voltage transformer also comprises: the overvoltage protection (not shown); First end of said overvoltage protection is connected with second end of said low-voltage arm resistance 8, and second end of said overvoltage protection is connected with first end of said low-voltage arm resistance 8.Said overvoltage protection is arranged in the cavity of said second hollow circular cylinder 30.
The present invention provides a kind of integral type electronic current voltage transformer that is exclusively used in overhead distribution.Its built-in 3 groups of coils and 2 cover voltage dividers have following beneficial effect:
(1), the direct post insulator on the instead of wireline bar
(2), the built-in current instrument transformer, be output as electronic type signal (4V, inactivity)
(3), current transformer part can export two groups and measure with current signal (0～500A, 0.2%), protect with current signal (0～20kA, 3%) for one group
(4), the built-in voltage instrument transformer, be output as electronic type signal (2V, inactivity)
(5), the voltage transformer part can be exported two groups of measurements with voltage signal (0～45kV, 0.2%)
(6), can make open type, easy for installation.
The principle of electronic current mutual inductor is below described.
Among the present invention, what electronic current mutual inductor adopted is the principle of Rogowski (Rogowski) coil and underloading coil (LPCT).Utilize the Rogowski coil to measure big current signal, be used for relaying protection, the range of linearity of measurable electric current reaches as high as 20kA.Utilize LPCT surveying work electric current, be used for metering and measurement, the range of linearity is 0～630A.
Therefore the Rogowski coil does not exist the magnetic saturation phenomenon owing to adopted nonmagnetic skeleton.When primary current passed through the Rogowski coil, coil can produce and the proportional secondary voltage E of the time diffusion of primary current I1.Secondary voltage E is carried out time integral handle, just can obtain and the proportional voltage signal U of primary current.Through microprocessor signal U is carried out conversion, processing, can primary current information be become analog quantity and digital quantity output.
The underloading coil is made up of winding, little iron core and the minimized secondary winding of loss.Connecting sample resistance R on the secondary winding, secondary current I2 is proportional at the voltage drop U2 and the primary current I1 at sampling electricity group R two ends.The LPCT iron core is selected the microcrystal non-crystal alloy for use, has high magnetic conduction, high sensitivity, unslugged characteristic.
The principle of electronic type voltage transformer is below described.
What electronic type voltage transformer adopted is that the electric resistance partial pressure mode is carried out work.EVT (voltage transformer) is made up of high-voltage arm resistance, low-voltage arm resistance, bucking electrode, overvoltage protection.Through voltage divider primary voltage is converted to and primary voltage and the proportional small voltage signal of phase place.Adopt bucking electrode to improve the influence of Electric Field Distribution situation and stray capacitance.At highly sensitive overvoltage protection of secondary output parallel connection, when preventing secondary output open circuit secondary side voltage is improved.
ECT (current transformer) and EVT below are described in application on power system, as shown in Figure 6, be EVT and the application of ECT in digital transformer substation.In digital transformer substation construction, utilize EVT measured voltage signal and the current signal that utilizes ECT to measure directly to be sent to collecting unit, in collecting unit, electric current and voltage signal are converted into digital signal.Deliver to combiner to digital signal through bus then, be sent at last in the monitoring software of digital transformer substation, further measure, measure and protect.
Electronic mutual inductor is the important technology support that digital transformer substation is built, and in fields such as power measurement and protections wide application prospect is arranged also simultaneously.Compare with traditional electromagnetic transformer, the electronic current voltage transformer has following advantage.
(1), measuring range is wide.
The Hz-KHz of electronic mutual inductor is wide, the measure linear scope is wide, the linearity good, and in effective range, the current transformer class of accuracy reaches the 0.2S/5P level, and the voltage measuring transformer class of accuracy can reach the 0.2/3p level.
(2), application mode is flexible.
What electronic mutual inductor was exported all is the small voltage signal; Be generally 1.5V～4V; This signal can be protected equipment interface with digital instrument, microcomputer measuring and controlling easily, need not to carry out the secondary conversion, thereby can reduce the complexity of system applies; Reduce measure error, improved the stability and the accuracy of equipment.
(3), safe and reliable.
Electronic mutual inductor does not all contain iron core (or containing little iron core), saturated phenomenon can not occur.Even if can not produce high voltage during the Current Transformer Secondary open circuit yet, can not produce big electric current during the voltage transformer secondary short circuit, the danger that no overcurrent punctures can not produce ferro resonance yet, thereby guarantee the safety of the person and equipment.
(4), volume is little, low in energy consumption.
The electronic mutual inductor volume is little, in light weight, can effectively save the space, and power consumption is minimum, and power savings very significantly has the characteristic of environment-friendly products.
(5), multipurpose.
The electronic current mutual inductor collection is measured and is protected in all over the body; Can be quick, complete, send primary information to computer exactly and carry out data processing or be connected with measurement, protective device such as digital instrumentation, realize metering, measurement, protection, control, status monitoring.Electronic type voltage transformer is realized primary voltage digitlization on-line monitoring as charged display unit simultaneously, and can be used as the supporting insulator use.
(6), long service life.
Because electronic mutual inductor self is low-power consumption, self coil can not produce heating, has guaranteed the useful life of instrument transformer.Install and use simple and convenient, the operation Maintenance free, useful life was greater than 30 years.
Following form is that traditional electromagnetic transformer and electronic current voltage transformer compare:
Electronic current voltage transformer of the present invention, its output signal can be the electronic signal of 4V, removes the secondary conversion from, can directly send follow-up monitoring equipment to.Current-voltage transformer of the present invention unites two into one, and volume and weight reduces greatly, can be so that manufacturing cost reduces, and actual installation with use, more conveniently provide to the user.
In the application scenarios as shown in Figure 1, current-voltage transformer output signal of the present invention is a multichannel electronic type analog signal, and comprising measuring with electric current secondary singal two-way, protection is with electric current secondary singal one tunnel; Measure with voltage secondary singal two-way.All output signals all are to isolate independently.This output signal is suitable for the measurement and the malfunction monitoring of distribution line.Can realize the measurement of the zero-sequence current and the residual voltage of overhead transmission line.Can be used for the monitoring of overhead transmission line short circuit and earth fault.
In practical application; The 1st drive test amount is used for the measurement of electric current with the electric current secondary singal; And the 2 tunnel measuring electric current secondary singal can connect each other from beginning to end, has so just obtained the zero sequence current signal of circuit, and zero sequence current signal can be used for detecting distribution line whether single phase ground fault takes place.When protection is used for measurement circuitry and is short-circuited perhaps over current fault with the electric current secondary singal, the instantaneous big electric current that passes through (can up to 20000 amperes).
The 1st drive test amount is used the voltage secondary singal, is used for the voltage of measurement circuitry.The 2nd drive test amount then connects the common port of ground connection with the voltage secondary singal, and is connected in series the resistance that resistance is suitable, and another termination the earth of resistance can measure the residual voltage signal on the small resistor that so just serial connection is gone into.Utilize this mode can solve the difficult problem that overhead distribution can't be measured residual voltage and zero-sequence current.
Current-voltage transformer of the present invention is applicable to the measurement of overhead distribution, malfunction monitoring.Can be practical with coordinative composition of equipments such as watt metering, on-pole switch controller, high-pressure reactive compensation devices.
The above is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from principle according to the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (2)
1. a current-voltage transformer is characterized in that, comprising:
First current transformer comprises: first coil on the iron core, and be used to supply high voltage transmission line to pass, the two ends output of said first coil is measured and is used current signal; First resistance is connected the two ends of said first coil;
Voltage transformer comprises: high-voltage arm resistance, and first end of said high-voltage arm resistance is connected with said high voltage transmission line; Low-voltage arm resistance, first end of said low-voltage arm resistance is connected with ground, and second end of said low-voltage arm resistance is connected with second end of said high-voltage arm resistance, and output is measured and is used voltage signal between first end of said low-voltage arm resistance and second end;
Two hollow circular cylinders; First hollow circular cylinder is arranged on second hollow circular cylinder top, and the parallel axes of said first hollow circular cylinder is in ground; The axis normal of said second hollow circular cylinder is in ground;
Said first coil is arranged in the cavity of said first hollow circular cylinder, and said first coil is parallel to the bottom surface of said first hollow circular cylinder, makes said high voltage transmission line pass the cavity and said first coil of said first hollow circular cylinder;
Said first resistance, said high-voltage arm resistance and said low-voltage arm resistance are arranged in the cavity of said second hollow circular cylinder;
Said two hollow circular cylinders are made up of insulating material.
2. current-voltage transformer according to claim 1 is characterized in that, also comprises: second current transformer comprises:
Second coil on the skeleton is used to supply high voltage transmission line to pass, and current signal is used in two ends output second protection of said second coil; Said second coil is parallel to the said first coil setting; Said skeleton is a nonmagnetic substance;
Second resistance is connected the two ends of said second coil;
Said second coil is arranged in the cavity of said first hollow circular cylinder; Said second resistance is arranged in the cavity of said second hollow circular cylinder.
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| CN201110028244A CN102169754B (en) | 2011-01-26 | 2011-01-26 | Current and voltage transformer |
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| CN201110028244A CN102169754B (en) | 2011-01-26 | 2011-01-26 | Current and voltage transformer |
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| CN102169754A CN102169754A (en) | 2011-08-31 |
| CN102169754B true CN102169754B (en) | 2012-09-19 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709045B (en) * | 2012-06-15 | 2015-09-16 | 四川泰克电器有限公司 | A kind of combination transformer |
| CN103245813B (en) * | 2013-03-28 | 2016-04-20 | 国家电网公司 | A kind of comprehensive sensing measuring apparatus based on resistance alloys and its implementation |
| CN106053913A (en) * | 2016-05-03 | 2016-10-26 | 北京铁道工程机电技术研究所有限公司 | Field bus type AC current transformer |
| CN105826000B (en) * | 2016-05-17 | 2018-08-07 | 江苏靖江互感器厂有限公司 | A kind of intelligence gas-filling cabinet punching electronic current mutual inductor |
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| DE2131225A1 (en) * | 1971-06-18 | 1973-01-04 | Siemens Ag | COMBINED MEASURING TRANSFORMER CONSISTING OF A CURRENT TRANSFORMER AND VOLTAGE TRANSFORMER UNIT |
| CN2696184Y (en) * | 2004-04-20 | 2005-04-27 | 西安高研电器有限责任公司 | Electronic combined current sensor |
| CN101080788A (en) * | 2004-12-17 | 2007-11-28 | 日立金属株式会社 | Magnetic core for current transformer, current transformer and watthour meter |
| CN201514851U (en) * | 2009-11-04 | 2010-06-23 | 安徽翔远电力科技有限公司 | Outdoor self-excited source three-phase combined electronic transducer metering device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5236244B2 (en) * | 1974-05-24 | 1977-09-14 |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2131225A1 (en) * | 1971-06-18 | 1973-01-04 | Siemens Ag | COMBINED MEASURING TRANSFORMER CONSISTING OF A CURRENT TRANSFORMER AND VOLTAGE TRANSFORMER UNIT |
| CN2696184Y (en) * | 2004-04-20 | 2005-04-27 | 西安高研电器有限责任公司 | Electronic combined current sensor |
| CN101080788A (en) * | 2004-12-17 | 2007-11-28 | 日立金属株式会社 | Magnetic core for current transformer, current transformer and watthour meter |
| CN201514851U (en) * | 2009-11-04 | 2010-06-23 | 安徽翔远电力科技有限公司 | Outdoor self-excited source three-phase combined electronic transducer metering device |
Non-Patent Citations (1)
| Title |
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| JP特开昭51-10328A 1976.01.27 |
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