CN102024556A - Self-adhesive hollow coil based electronic current transformer - Google Patents
Self-adhesive hollow coil based electronic current transformer Download PDFInfo
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- CN102024556A CN102024556A CN2009101449534A CN200910144953A CN102024556A CN 102024556 A CN102024556 A CN 102024556A CN 2009101449534 A CN2009101449534 A CN 2009101449534A CN 200910144953 A CN200910144953 A CN 200910144953A CN 102024556 A CN102024556 A CN 102024556A
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Abstract
The invention relates to a self-adhesive hollow coil based electronic current transformer which belongs to the technical field of current measurement and relay protection in power systems and solves the problem of the influence to output precision of a hollow coil of a traditional electronic current transformer due to uneven winding density and thermal expansion and cold contraction of a framework. The electronic current transformer is characterized in that the hollow coil is made of a plurality of self-adhesive hollow coils and a printed circuit board frame; the self-adhesive hollow coils are uniformly welded and fixed on the circular printed circuit board frame sequentially according to a counterclockwise order and are connected sequentially in series by printed wires; the hollow coil senses a differential voltage signal of current in a primary conducting rod; the signal is transmitted into a primary converter by a transmitting system; and the signal is converted into a voltage signal which conforms to international signals by the converter and then is outputted. The electronic current transformer can be used for measuring high voltage and high current, has the advantages of good linearity, high measuring accuracy and the like, and has good application prospect.
Description
Technical field
The present invention relates to current measurement and technical field of relay protection in the electric power system, be specially a kind of electronic current mutual inductor based on the self-adhesion air core coil.
Technical background
Electronic current mutual inductor is the important component part of power system measuring and relaying protection.The critical component that influences the mutual inductor measuring accuracy of measurement is the air core coil of sampling, and the air core coil in traditional electronic current mutual inductor is made up of the lead that is surrounded on the nonmagnetic substance skeleton.To the sinusoidal current under the stable state, air core coil sampling accuracy depends on the making of high accuracy air core coil, and high accuracy air core coil technique for coiling is had relatively high expectations, and must be loop density and skeleton constant cross section, coil section is long-pending vertical with center line, otherwise measure error will be bigger.At present, the air core coil design accuracy requires to be up to 0.1% grade, and electronic current mutual inductor that can be traditional only reaches 1%～3%, and main cause is exactly that the air core coil accuracy of manual coiling is not high, dispersiveness during batch process is bigger, has hindered its industry development; Another problem is exactly that expanding with heat and contract with cold of non magnetic framework material had a strong impact on the air core coil output accuracy, and this is the not high main cause of conventional air core coil electronic current mutual inductor precision, so conventional air core coil manufacture method must be improved.
The self-adhesion hollow coil is mainly used on Low-voltage Electronic circuit and the low-voltage electrical apparatus at present, it mainly is the electromagnetic induction characteristic of utilizing it, as electromagnetic induction coil, in the Low-voltage Electronic circuit, can form high pass or low pass filter, phase-shift circuit and resonant circuit with resistor or capacitor, interchange is had metering function, and play effects such as signal coupling and frequency-selecting.Use in toy and electromagnetically operated valve, after coil passed through electric current, according to the Faradic electricity magnetic induction principle, itself had formed an electromagnet, and metal is had suction-operated.The self-adhesion hollow coil in all these places all is single use, and what pass through in the coil is current signal.
Summary of the invention
A kind of electronic current mutual inductor based on the self-adhesion air core coil of the present invention technical problem to be solved is: the self-adhesion hollow coil is combined use as signal source, pass through magnetic field induction, interlinkage goes out differential signal, it is voltage signal, be used to measure high-voltage great-current, solved traditional electrical minor current transformer air core coil because of the problem of the even unstable properties of bringing of coiling density unevenness and because of skeleton expands with heat and contract with cold to the influence of air core coil output accuracy, a kind of electronic current mutual inductor of high-acruracy survey high-voltage great-current is provided.
The technical solution used in the present invention is: a kind of electronic current mutual inductor based on the self-adhesion air core coil, comprise the primary conductive bar, air core coil, transmission system, transducer, it is characterized by: described air core coil is by several self-adhesion air core coils, the circular printed circuit board skeleton constitutes, the even self-adhesion air core coil welding of several that with good grounds design need be made on the circular printed circuit board skeleton fixing point, also be manufactured with output signal wire bonds point and printed circuit cable simultaneously, the self-adhesion air core coil evenly is weldingly fixed on the circular printed circuit board skeleton according to counterclockwise order successively, internal layer inlet wire on the self-adhesion air core coil and outer lead-out wire connect with printed circuit cable on the circular printed circuit board skeleton, by several self-adhesion air core coils of printed circuit cable series connection mutually successively; The size of current that the quantity of self-adhesion air core coil is measured as required and deciding.
The invention has the beneficial effects as follows: this product cost is low, and design, processing and fabricating is simple, and technology maturation easily reaches high accuracy and realizes exquisite profile; Good stability, the precision height can be realized 0.1% class precision; Have the frequency band of broad, response speed is fast, and measuring range is big; Temperature test (in 40 ℃ of-+90 ℃ of temperature ranges) error changes＜0.1%, is subjected to outside electromagnetic interference less, can measure high-voltage great-current simultaneously, and good prospects for application is arranged.
Description of drawings
Fig. 1 is a kind of electronic current mutual inductor schematic diagram based on the self-adhesion air core coil of the present invention.
1 is the primary conductive bar, and 2 is the self-adhesion air core coil, and 3 is air core coil, and 4 is transmission system, and 5 is transducer.
Fig. 2 is a kind of electronic current mutual inductor self-adhesion coil outline drawing based on the self-adhesion air core coil of the present invention.
6 is coil internal layer inlet wire, and 7 is outer lead-out wire.
Fig. 3 is a kind of electronic current mutual inductor printed circuit framework outline drawing based on the self-adhesion air core coil of the present invention.
8 are self-adhesion air core coil welding fixing point, and 9 is the circular printed circuit board skeleton, and 10 is the output signal lead solder-joint, and 11 is printed circuit cable
Embodiment
As shown in drawings, a kind of electronic current mutual inductor of the present invention based on the self-adhesion air core coil, comprise primary conductive bar 1, air core coil 3, transmission system 4, transducer 5, it is characterized by: described air core coil 3 is by several self-adhesion air core coils 2, circular printed circuit board skeleton 9 constitutes, the even self-adhesion air core coil welding of several that with good grounds design need be made on the circular printed circuit board skeleton 9 fixing point 8, also be manufactured with output signal wire bonds point 10 and printed circuit cable 11 simultaneously, self-adhesion air core coil 2 evenly is weldingly fixed on the circular printed circuit board skeleton 9 according to counterclockwise order successively, internal layer inlet wire 6 on the self-adhesion air core coil 2 and outer lead-out wire 7 are connected with printed circuit cable 11 on the circular printed circuit board skeleton 9, by printed circuit cable 11 several self-adhesion air core coils 2 series connection mutually successively; The size of current that the quantity of self-adhesion air core coil 2 is measured as required and deciding.
The present invention combines self-adhesion hollow coil 2 to use as signal source, pass through magnetic field induction, interlinkage goes out differential signal, it is voltage signal, be used to measure high-voltage great-current, and prior art self-adhesion hollow coil 2 mainly is to be applied on Low-voltage Electronic circuit and the low-voltage electrical apparatus, and is single use, and what pass through in the coil is current signal.Self-adhesion air core coil 2 of the present invention is hollow; easily make, process simple; resistance inductance consistency is very high; number of turn unanimity; dispersiveness is very little; the circular printed circuit board skeleton is five layers of standard epoxy resin bonded fiber, adopts the circular printed circuit board skeleton 9 of self-adhesion air core coil 2 and computer design easily to realize high-precision air core coil 3 making and batch process, satisfies the measurement of electric power system and the requirement of relaying protection.
Primary conductive bar 1 passes air core coil 3 and cast is fixed on air core coil 3 middles, and transmission system 4 one ends are connected with output signal wire bonds point 10, and the other end is connected with primary transducer 5.As shown in Figure 1; embodiment of the present invention is; primary conductive bar 1 is connected in the electrical network; the electric current that flows through in the primary conductive bar 1 induces differentiated voltage signal in air core coil 3; voltage signal is transferred to primary transducer 5 through transmission system 4, and transducer 5 is measured voltage signal and output that conversion of signals becomes to meet GB and the relaying protection voltage signal as the instrument and meter acceptable.
Claims (3)
1. electronic current mutual inductor based on the self-adhesion air core coil, comprise primary conductive bar (1), air core coil (3), transmission system (4), transducer (5) is characterized in that: described air core coil (3) is to be made of several self-adhesion air core coils (2), circular printed circuit board skeleton (9).
2. want 1 described a kind of electronic current mutual inductor according to right based on the self-adhesion air core coil, it is characterized in that: self-adhesion air core coil (2) evenly is weldingly fixed on the circular printed circuit board skeleton (9) successively according to counterclockwise order, and several self-adhesion air core coils (2) are by printed circuit cable (11) series connection mutually successively.
3. want 1 described a kind of electronic current mutual inductor according to right, it is characterized in that: the size of current that the quantity of self-adhesion air core coil (2) is measured as required and deciding based on the self-adhesion air core coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101449534A CN102024556A (en) | 2009-09-15 | 2009-09-15 | Self-adhesive hollow coil based electronic current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101449534A CN102024556A (en) | 2009-09-15 | 2009-09-15 | Self-adhesive hollow coil based electronic current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102024556A true CN102024556A (en) | 2011-04-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101449534A Pending CN102024556A (en) | 2009-09-15 | 2009-09-15 | Self-adhesive hollow coil based electronic current transformer |
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| CN (1) | CN102024556A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021190042A1 (en) * | 2020-03-26 | 2021-09-30 | 韩铁刚 | Flexible coil for current transformer, and current transformer |
| CN115792333A (en) * | 2022-11-16 | 2023-03-14 | 国网湖北省电力有限公司营销服务中心(计量中心) | Charging equipment charging current detection method and device |
| CN117330813A (en) * | 2023-09-27 | 2024-01-02 | 苏州万龙电气集团股份有限公司 | Hollow current measurement method, hybrid current transformer and circuit breaker |
-
2009
- 2009-09-15 CN CN2009101449534A patent/CN102024556A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021190042A1 (en) * | 2020-03-26 | 2021-09-30 | 韩铁刚 | Flexible coil for current transformer, and current transformer |
| CN115792333A (en) * | 2022-11-16 | 2023-03-14 | 国网湖北省电力有限公司营销服务中心(计量中心) | Charging equipment charging current detection method and device |
| CN115792333B (en) * | 2022-11-16 | 2023-09-22 | 国网湖北省电力有限公司营销服务中心(计量中心) | Charging current detection method and device for charging equipment |
| CN117330813A (en) * | 2023-09-27 | 2024-01-02 | 苏州万龙电气集团股份有限公司 | Hollow current measurement method, hybrid current transformer and circuit breaker |
| CN117330813B (en) * | 2023-09-27 | 2024-05-14 | 上海磊跃自动化设备有限公司 | Hollow current measurement method, hybrid current transformer and circuit breaker |
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Application publication date: 20110420 |