CN202601406U - Intelligent/networked electronic current transformer based on non-penetrating hollow coil - Google Patents
Intelligent/networked electronic current transformer based on non-penetrating hollow coil Download PDFInfo
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- CN202601406U CN202601406U CN 201220249567 CN201220249567U CN202601406U CN 202601406 U CN202601406 U CN 202601406U CN 201220249567 CN201220249567 CN 201220249567 CN 201220249567 U CN201220249567 U CN 201220249567U CN 202601406 U CN202601406 U CN 202601406U
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Abstract
The utility model relates to an intelligent/networked electronic current transformer based on a non-penetrating hollow coil. The intelligent/networked electronic current transformer comprises an once conductor, a current sampling sensor, a signal processing module and a signal transmission module, wherein the once conductor is parallel to the non-penetrating hollow coil to sample current signals which are output by an analog-to-digital (A/D) collection module through a merging unit after digital integration, amplification phase shift and impedance matching sequentially. The intelligent/networked electronic current transformer based on the non-penetrating hollow coil has the advantages of being simple in structure, small in size, low in manufacture cost, high in sampling accuracy, small in error, short in response time, high in reliability, suitable for measuring current of a digital transformer substation in a power system and protecting relaying and the like.
Description
Technical field
The utility model relates to a kind of electronic current mutual inductor, and is particularly a kind of based on non-penetration type air core coil intellectuality/network electronic formula current transformer.
Background technology
At present, electric power system to the miniaturization of power equipment, intellectuality, high reliability require increasingly high.The Primary Conductor of existing electromagnetic current transducer and electronic current mutual inductor all runs through and mistake from the secondary winding of current transformer; The user to instrument transformer electric pressure dynamic and thermal stability require increasingly high; Cause the required cross section of insulation distance and the Primary Conductor of instrument transformer increasing, thereby cause volume increase, complex structure, the manufacturing cost of instrument transformer to improve; Need be series in the current transformer use in the circuit, when instrument transformer is installed, need break off one time circuit, use copper bar, cable etc. and the Primary Conductor of instrument transformer to connect into series circuit again, operation inconvenience, coefficient of safety is low, and the signal transmission is unstable; Sampling unit adopts the single loop sampling, causes dropout easily, has shortcomings such as sampling precision is not high, the obvious increase of error.In addition, a lot of signal processing adopt the analog integration loss big, and the response time is long, uses undesirable.
Summary of the invention
The purpose of the utility model be overcome complex structure in the prior art, bulky, cost is high; Defectives such as sampling precision is not high, error is big, the response time is slow, reliability is low; And provide a kind of based on non-penetration type air core coil intellectuality/network electronic formula current transformer, in electric power system, be widely used in current measurement and relaying protection in the digital transformer substation.
The technical scheme that the utility model adopts is: a kind ofly comprise Primary Conductor, current sample transducer, signal processing module and signal transmission module based on non-penetration type air core coil intellectuality/network electronic formula current transformer, it is characterized in that:
Said current sample transducer comprises air-core inductance and rectangular conductive skeleton, and air-core inductance is welded on the rectangular conductive skeleton, and Primary Conductor is located at outside the air-core inductance and is parallel to air-core inductance coiling direction;
Said signal processing module comprises digital integrator and amplifies phase-shifting unit; Digital integrator connects the current sample transducer; Amplify phase-shifting unit and connect digital integrator; The current signal of Primary Conductor converts the secondary voltage differential signal into through the reduction of digital integrator differential signal through air-core inductance, and the amplification phase-shifting unit that is connected with digital integrator is delivered to signal transmission module with the amplification of secondary voltage differential signal, the phase shift of reduction;
Said signal transmission module comprises A/D acquisition module and merge cells; The analog quantity secondary voltage conversion of signals that the A/D acquisition module will amplify phase-shifting unit transfers to merge cells for the digital quantity voltage signal, and analog quantity, digital quantity output or GPRS wireless telecommunications output are adopted in the output of merge cells data.
Further, many even vertical weldings of air-core inductance are connected on the relative rectangular edges of rectangular conductive skeleton, and Primary Conductor is parallel with rectangular edges.
Further, said amplification phase-shifting unit connects signal transmission module through impedance matching circuit.
Again further, said signal transmission module comprises two above A/D acquisition modules, and two above A/D acquisition modules are connected in parallel between signal processing module and the merge cells.
Compared with prior art, the utlity model has following advantage:
1. many even vertical weldings of air-core inductance are connected on the relative rectangular edges of rectangular conductive skeleton, and Primary Conductor is parallel with rectangular edges, and Primary Conductor does not run through air-core inductance; Need not to consider the influence to the instrument transformer design of insulation distance and dynamic and thermal stability, simple in structure in design, volume reduces; Cost reduces, and in installing and using, does not need operating personnel to break off transmission circuit; Simple to operation, coefficient of safety is high;
2. the rectangular conductive skeleton cooperates air-core inductance as the current sample transducer; Thoroughly getting rid of skeleton expands with heat and contract with cold to the influence of hollow core coil output accuracy; Adopt and print conductive plate; Be prone to realize high-precision hollow core coil making and batch process, satisfy the measurement of electric power system and the requirement of relaying protection;
3. signal processing unit adopts digital integrator; Directly calculate by integrated package; Error is little, precision is high, response cycle is short; Avoid tradition to adopt resistance, electric capacity to add the operational amplifier analog integration, it is bigger influenced by the components and parts accuracy of manufacture, ambient temperature etc., shortcoming such as have that the analog integration signal errors is big, low-response, precision are low;
4. adopt the design of two above A/D sampling module parallel connection sampling circuits, multipleization sampling, comparison in real time, verification multi-channel sampling value realize sampling circuit hardware check and monitoring function, help improving performance safe in utilization, accurate.
The utility model adopts the parallel non-air-core inductance sample rate current signal that runs through of Primary Conductor; After digital integration, amplification phase shift, impedance matching, export through merge cells successively by the A/D acquisition module; Have simple in structure, volume is little, low cost of manufacture; Sampling precision is high, error is little, the response time is short, the reliability advantages of higher, is applicable to digital transformer substation current measurement and relaying protection in electric power system.
Description of drawings
Fig. 1 is the utility model schematic diagram.
Among the figure: Primary Conductor 1, rectangular conductive skeleton 2, air-core inductance 3, digital integrator 4 amplifies phase-shifting unit 5, impedance matching circuit 6, A/D acquisition module 7, merge cells 8.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further.
Shown in Figure 1, a kind of based on non-penetration type air core coil intellectuality/network electronic formula current transformer Primary Conductor 1, rectangular conductive skeleton 2, air-core inductance 3, digital integrator 4, amplification phase-shifting unit 5, impedance matching circuit 6, A/D acquisition module 7 and merge cells 8.Air-core inductance 3 is formed the current sample transducer with rectangular conductive skeleton 2; Many air-core inductance 3 even vertical weldings are connected on the rectangular conductive skeleton 2 relative rectangular edges, and it is outer and to be parallel to air-core inductance coiling direction parallel with rectangular edges that Primary Conductor 1 is located at air-core inductance; Digital integrator 4, amplification phase-shifting unit 5 and impedance matching circuit 6 are formed signal processing modules; Digital integrator 4 connects the current sample transducer; Digital integrator 4 is successively through amplifying phase-shifting unit 5, impedance matching circuit 6 connection signal transmission modules; Signal transmission module comprises that two above A/D acquisition modules 7 and 8, two above A/D acquisition modules of a merge cells are connected in parallel between impedance matching box 6 and the merge cells 8.
The current signal of Primary Conductor converts the secondary voltage differential signal into through the reduction of digital integrator differential signal through air-core inductance, and the amplification phase-shifting unit that is connected with digital integrator is delivered to signal transmission module with the amplification of secondary voltage differential signal, the phase shift of reduction; The analog quantity secondary voltage conversion of signals that the A/D acquisition module will amplify phase-shifting unit transfers to merge cells for the digital quantity voltage signal, and analog quantity, digital quantity output or GPRS wireless telecommunications output are adopted in the output of merge cells data.
Claims (4)
1. one kind based on non-penetration type air core coil intellectuality/network electronic formula current transformer, comprises Primary Conductor, current sample transducer, signal processing module and signal transmission module, it is characterized in that:
Said current sample transducer comprises air-core inductance and rectangular conductive skeleton, and air-core inductance is welded on the rectangular conductive skeleton, and Primary Conductor is located at outside the air-core inductance and is parallel to air-core inductance coiling direction;
Said signal processing module comprises digital integrator and amplifies phase-shifting unit; Digital integrator connects the current sample transducer; Amplify phase-shifting unit and connect digital integrator; The current signal of Primary Conductor converts the secondary voltage differential signal into through the reduction of digital integrator differential signal through air-core inductance, and the amplification phase-shifting unit that is connected with digital integrator is delivered to signal transmission module with the amplification of secondary voltage differential signal, the phase shift of reduction;
Said signal transmission module comprises A/D acquisition module and merge cells; The analog quantity secondary voltage conversion of signals that the A/D acquisition module will amplify phase-shifting unit transfers to merge cells for the digital quantity voltage signal, and analog quantity, digital quantity output or GPRS wireless telecommunications output are adopted in the output of merge cells data.
2. according to claim 1 based on non-penetration type air core coil intellectuality/network electronic formula current transformer, it is characterized in that: many even vertical weldings of air-core inductance are connected on the relative rectangular edges of rectangular conductive skeleton, and Primary Conductor is parallel with rectangular edges.
3. according to claim 1 based on non-penetration type air core coil intellectuality/network electronic formula current transformer, it is characterized in that: said amplification phase-shifting unit connects signal transmission module through impedance matching circuit.
4. according to claim 1 or 3 described based on non-penetration type air core coil intellectuality/network electronic formula current transformer; It is characterized in that: said signal transmission module comprises two above A/D acquisition modules, and two above A/D acquisition modules are connected in parallel between signal processing module and the merge cells.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220249567 CN202601406U (en) | 2012-05-30 | 2012-05-30 | Intelligent/networked electronic current transformer based on non-penetrating hollow coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220249567 CN202601406U (en) | 2012-05-30 | 2012-05-30 | Intelligent/networked electronic current transformer based on non-penetrating hollow coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202601406U true CN202601406U (en) | 2012-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220249567 Expired - Lifetime CN202601406U (en) | 2012-05-30 | 2012-05-30 | Intelligent/networked electronic current transformer based on non-penetrating hollow coil |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104076185A (en) * | 2014-07-17 | 2014-10-01 | 重庆大学 | Differential ring lightning current sensor based on printed circuit board and digital integration |
| CN105301318A (en) * | 2015-11-04 | 2016-02-03 | 国家电网公司 | Distributed current transformer |
| CN110057280A (en) * | 2019-03-28 | 2019-07-26 | 中国电力科学研究院有限公司 | A kind of the monitoring system and monitoring method of contact of breaker stroke |
-
2012
- 2012-05-30 CN CN 201220249567 patent/CN202601406U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104076185A (en) * | 2014-07-17 | 2014-10-01 | 重庆大学 | Differential ring lightning current sensor based on printed circuit board and digital integration |
| CN105301318A (en) * | 2015-11-04 | 2016-02-03 | 国家电网公司 | Distributed current transformer |
| CN110057280A (en) * | 2019-03-28 | 2019-07-26 | 中国电力科学研究院有限公司 | A kind of the monitoring system and monitoring method of contact of breaker stroke |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121212 |