CN209842045U - Portable secondary circuit patrol instrument based on open current transformer - Google Patents
Portable secondary circuit patrol instrument based on open current transformer Download PDFInfo
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- CN209842045U CN209842045U CN201822159227.7U CN201822159227U CN209842045U CN 209842045 U CN209842045 U CN 209842045U CN 201822159227 U CN201822159227 U CN 201822159227U CN 209842045 U CN209842045 U CN 209842045U
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Abstract
The utility model provides a portable secondary circuit patrols and examines appearance based on opening current transformer, the opening current transformer that wherein uses includes: the first iron core is formed by splicing two parts and forms an annular cavity; the second iron core is formed by splicing two parts and is positioned in the cavity; the primary winding, the secondary winding and the first detection winding are wound on the first iron core; the second detection winding is wound on the second iron core; the reverse input end of the operational amplifier is connected with the homonymous end of the second detection winding, the homonymous input end of the operational amplifier is connected with the non-homonymous end of the second detection winding, and the output end of the operational amplifier is connected with the non-homonymous end of the first detection winding; a first resistor; a second resistor. The utility model provides a portable secondary circuit patrols and examines appearance based on opening current transformer has improved the precision.
Description
Technical Field
The utility model belongs to the technical field of secondary circuit patrols and examines appearance technique and specifically relates to a portable secondary circuit patrols and examines appearance based on opening current transformer.
Background
With the continuous and rapid increase of economy in China, power customers are in diversified development, however, under the drive of benefits, part of the power customers destroy or interfere the electric energy metering device by various means to achieve the purpose of stealing electricity. According to statistics, the direct economic loss caused by electricity stealing in the range of national network companies from 2014 to 2017 every year exceeds 10 hundred million yuan, and personal electric shock casualty accidents caused by electricity stealing account for 28 percent of electric shock accidents. In recent years, electricity stealing cases of electric energy metering devices present the characteristics of equipment specialization and means hiding, the investigation difficulty is high, the destructive power is high, and the caused loss is particularly serious.
The patent publication No. CN204613359U in grant China discloses a detection system for the secondary loop state of a current transformer for metering, which can classify the electricity stealing behaviors by measuring the short circuit and open circuit states of the current and voltage of the secondary loop and report the electricity stealing behaviors to an electricity information acquisition system in real time, so that the real-time monitoring of the electricity stealing behaviors can be realized.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a portable secondary circuit patrols and examines appearance based on opening current transformer, improves the precision.
The utility model provides a portable secondary circuit patrols and examines appearance based on opening current transformer, the side once of current transformer for the measurement links to each other with power frequency power supply, and current transformer's for the measurement secondary side is connected with the electric energy meter and constitutes the secondary circuit, the appearance is patrolled and examined in the secondary circuit includes: set up high frequency voltage signal generation unit, oscillation and resonance detecting element and the current detection unit on secondary circuit, high frequency voltage signal generation unit, oscillation and resonance detecting element and current detection unit all are connected to the singlechip, the electric energy meter passes through the communication unit and is connected to the singlechip, wherein, oscillation and resonance detecting element with all use opening current transformer in the current detection unit, opening current transformer includes:
the first iron core is formed by splicing two parts and forms an annular cavity;
the second iron core is formed by splicing two parts and is positioned in the cavity;
the primary winding is wound on the first iron core;
the secondary winding is wound on the first iron core;
the first detection winding is wound on the first iron core;
the second detection winding is wound on the second iron core, and the number of turns of the second detection winding is consistent with that of the first detection winding;
the reverse input end of the operational amplifier is connected with the homonymous end of the second detection winding, the homonymous input end of the operational amplifier is connected with the non-homonymous end of the second detection winding, the output end of the operational amplifier is connected with the non-homonymous end of the first detection winding, and the negative power supply end of the operational amplifier is respectively connected with the non-homonymous end of the second detection winding and the homonymous end of the first detection winding;
the first resistor is connected between the inverting input end and the output end of the operational amplifier in parallel;
and the resistance value of the second resistor is consistent with that of the first resistor, and the second resistor is connected between the output end of the operational amplifier and the non-homonymous end of the first detection winding in series.
Further, the number of turns of the secondary winding is 30 ~ 70 turns, the number of turns of the first detection winding is 260 ~ 350 turns, and the number of turns of the second detection winding is 260 ~ 350 turns.
Furthermore, the number of turns of the secondary winding is 50 turns, the number of turns of the first detection winding is 300 turns, and the number of turns of the second detection winding is 300 turns.
Furthermore, the first iron core and the second iron core are made of ultracrystalline materials.
The utility model provides a portable secondary circuit patrols and examines appearance based on opening current transformer, oscillation and resonance detecting element with the opening current transformer who uses in the current detecting element has adopted electronic feedback circuit, has increased opening current transformer's measurement accuracy, has more truly reflected current signal in the secondary circuit under the operating condition, has improved the precision that secondary circuit patrolled and examined the appearance.
Drawings
Fig. 1 is the circuit diagram of the open current transformer in the portable secondary circuit patrol instrument based on the open current transformer.
In the figure, NPA side winding, IPPrimary side current, NSSecondary winding, ISSecondary side current, NCFirst detection winding, NDA second detection winding, C1A first iron core, C2Second iron core, A operational amplifier, R1First resistance, R2A second resistance.
Detailed Description
The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.
The utility model discloses a further improvement on the chinese patent basis that the publication number is CN204613359U authorizes, with oscillation and resonance detecting element with current sensor in the current detecting element changes opening current transformer into to make things convenient for electrified installation, made the promotion to opening current transformer's precision simultaneously. In the following embodiments, only the open current transformer is described in detail, and the rest of the embodiments are consistent with the chinese patent with the publication number CN204613359U, and are not described herein again.
The utility model provides a portable secondary circuit patrols and examines appearance based on opening current transformer, the measurement is continuous with power frequency power supply with current transformer's once side, and the measurement is connected and is constituted with current transformer's secondary side and electric energy meter secondary circuit, the appearance is patrolled and examined to the secondary circuit includes: the high-frequency voltage signal generating unit, the oscillation and resonance detecting unit and the current detecting unit are arranged on the secondary loop, the high-frequency voltage signal generating unit, the oscillation and resonance detecting unit and the current detecting unit are all connected to a single chip microcomputer, the electric energy meter is connected to the single chip microcomputer through a communication unit, wherein an open current transformer is used in the oscillation and resonance detecting unit and the current detecting unit, and as shown in fig. 1, the open current transformer comprises:
first iron core C1The device is formed by splicing two parts and forms an annular cavity;
second iron core C2The two parts are spliced and positioned in the cavity;
primary winding IPWound around the first core C1To generate a primary side current IP；
Secondary winding NSWound around the first core C1On, a secondary side current I is generatedS；
First detection winding NCWound around the first core C1The above step (1);
second detection winding NDWound around the second core C2Upper, the number of turns and the first detection winding NCThe consistency is achieved;
an operational amplifier A having an inverting input terminal and the second detection winding NDIs connected with the homonymous terminal of the first detection winding, and the homonymous input end of the first detection winding is connected with the second detection winding NDIs connected with the non-homonymous terminal of the first detection winding N, and the output end of the first detection winding is connected with the non-homonymous terminal of the second detection winding NCIs connected with the non-homonymous terminal of the first detection winding, and the negative power supply terminal of the first detection winding is respectively connected with the second detection winding NDAnd said first detection winding NCThe homonymous terminals of the two terminals are connected;
a first resistor R1The operational amplifier A is connected between the inverting input end and the output end of the operational amplifier A in parallel;
a second resistor R2Its resistance value is equal to the first resistor R1In series with the output of the operational amplifier A and the first detection winding NCBetween non-homonymous ends of (c).
This implementationIn the example, the first core C1And a second core C2The splicing structure is designed conventionally, and the requirements of the open current transformer are met. The function of the operational amplifier A is to reduce the second core C2A burden on the second detection winding NDCan accurately measure the first iron core C1The error of (2). The operational amplifier A passes through the second detection winding NDA virtual short circuit is formed so that the second core C2No magnetization occurs and the current generated by the operational amplifier A passes through the first detection winding NCInto the first iron core C1Thereby the secondary winding NSSecondary side current I inSAnd can be accurately measured. Second detection winding NDThe detected exciting current passes through a first resistor R1Is converted into a voltage by a second resistor R2Then a current is generated to enter the first iron core C1Generating a magnetizing current, wherein a first resistor R1And a second resistor R2The ratio of the resistance values must be compared with the second detection winding NDAnd a first detection winding NCThe ratio of the number of turns of (c) is equal.
In the embodiment, the electronic feedback circuit is adopted, so that the measurement accuracy of the open current transformer is improved, the current signal in the secondary circuit under the actual working condition is reflected more truly, and the precision of the open current transformer is improved.
In an optional implementation manner of this embodiment, the secondary winding NS30 ~ 70 turns, preferably 50 turns, the first detection winding NC260 ~ 350 turns, preferably 300 turns, and the second detection winding ND260 ~ 350 turns, preferably 300 turns.
In an optional implementation manner of this embodiment, the first iron core and the second iron core are made of ultracrystalline materials.
The protection scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.
Claims (4)
1. The utility model provides a portable secondary circuit patrols and examines appearance based on opening current transformer, its characterized in that, the measurement links to each other with power frequency power supply with current transformer's primary side, and the measurement is connected and is constituted with current transformer's secondary side and electric energy meter secondary circuit, the appearance is patrolled and examined to the secondary circuit includes: set up high frequency voltage signal generation unit, oscillation and resonance detecting element and the current detection unit on secondary circuit, high frequency voltage signal generation unit, oscillation and resonance detecting element and current detection unit all are connected to the singlechip, the electric energy meter passes through the communication unit and is connected to the singlechip, wherein, oscillation and resonance detecting element with all use opening current transformer in the current detection unit, opening current transformer includes:
the first iron core is formed by splicing two parts and forms an annular cavity;
the second iron core is formed by splicing two parts and is positioned in the cavity;
the primary winding is wound on the first iron core;
the secondary winding is wound on the first iron core;
the first detection winding is wound on the first iron core;
the second detection winding is wound on the second iron core, and the number of turns of the second detection winding is consistent with that of the first detection winding;
the reverse input end of the operational amplifier is connected with the homonymous end of the second detection winding, the homonymous input end of the operational amplifier is connected with the non-homonymous end of the second detection winding, the output end of the operational amplifier is connected with the non-homonymous end of the first detection winding, and the negative power supply end of the operational amplifier is respectively connected with the non-homonymous end of the second detection winding and the homonymous end of the first detection winding;
the first resistor is connected between the inverting input end and the output end of the operational amplifier in parallel;
and the resistance value of the second resistor is consistent with that of the first resistor, and the second resistor is connected between the output end of the operational amplifier and the non-homonymous end of the first detection winding in series.
2. The portable secondary circuit patrol instrument based on an open current transformer as claimed in claim 1, wherein the number of turns of the secondary winding is 30 ~ 70 turns, the number of turns of the first detection winding is 260 ~ 350 turns, and the number of turns of the second detection winding is 260 ~ 350 turns.
3. The portable secondary circuit patrol instrument based on the open current transformer as recited in claim 2, wherein the number of turns of the secondary winding is 50 turns, the number of turns of the first detection winding is 300 turns, and the number of turns of the second detection winding is 300 turns.
4. The portable secondary circuit patrol instrument based on the open current transformer of claim 1 ~ 3, wherein the material of the first iron core and the second iron core is ultra-crystalline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822159227.7U CN209842045U (en) | 2018-12-21 | 2018-12-21 | Portable secondary circuit patrol instrument based on open current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822159227.7U CN209842045U (en) | 2018-12-21 | 2018-12-21 | Portable secondary circuit patrol instrument based on open current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209842045U true CN209842045U (en) | 2019-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822159227.7U Active CN209842045U (en) | 2018-12-21 | 2018-12-21 | Portable secondary circuit patrol instrument based on open current transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111430140A (en) * | 2020-04-29 | 2020-07-17 | 河北申科电力股份有限公司 | Wide-temperature miniature combined current transformer |
-
2018
- 2018-12-21 CN CN201822159227.7U patent/CN209842045U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111430140A (en) * | 2020-04-29 | 2020-07-17 | 河北申科电力股份有限公司 | Wide-temperature miniature combined current transformer |
| CN111430140B (en) * | 2020-04-29 | 2021-05-11 | 河北申科电力股份有限公司 | Wide-temperature miniature combined current transformer |
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