CN216350908U - Voltage transformer circuit for metering - Google Patents
Voltage transformer circuit for metering Download PDFInfo
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- CN216350908U CN216350908U CN202122948774.5U CN202122948774U CN216350908U CN 216350908 U CN216350908 U CN 216350908U CN 202122948774 U CN202122948774 U CN 202122948774U CN 216350908 U CN216350908 U CN 216350908U
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Abstract
The utility model relates to a voltage transformer circuit for metering, which comprises a voltage transformer module and a zero sequence transformer module, wherein the voltage transformer module comprises a secondary winding, the zero sequence transformer module comprises a microcomputer protection device, the secondary winding comprises a metering winding, a measuring winding and a harmonic elimination winding, the metering winding comprises a 1a terminal, a 1b terminal and a 1c terminal, the output ends of the 1a, the 1b and the 1c are all grounded, the measuring winding comprises a 2a terminal, a 2b terminal and a 2c terminal, the output ends of the 2a, the 2b and the 2c are all grounded, the harmonic elimination winding comprises a da terminal, a dn1 terminal, a dn2 terminal, a dn3 terminal and a voltage relay KV2, one end of the da is connected with the dn1, the dn2 and the dn3 in series, the other end of the da is connected with one end of the voltage relay 2, the other end of the voltage relay 2 is connected with one end of the microcomputer protection device dn, the other end of the microcomputer protection device dn and one end of dn3 are both grounded. The utility model has the advantages of high working reliability and strong practicability.
Description
Technical Field
The utility model relates to the technical field of electric energy metering, in particular to a voltage transformer circuit for metering.
Background
The voltage transformer is an instrument for transforming the voltage on the line, is suitable for a 10KV line system, is used for metering, and plays a role in measurement and protection. The existing voltage transformer is designed for grounding of a circuit of a metering winding and a measuring winding which are connected with a resonance elimination winding, and is used for detecting and eliminating resonance generated by a line. Although the circuit design of the existing voltage transformer has the advantage of anti-resonance, when a system has faults such as harmonic waves and the like, the neutral point potential shifts, the interference on a metering winding and a measuring winding is large, and the voltage transformer cannot be effectively metered and measured, so that the voltage transformer has the defects of low working reliability and poor practicability.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a voltage transformer circuit for metering, which has high operational reliability and strong practicability.
In order to achieve the above object, the present invention adopts a voltage transformer circuit for metering, which comprises a voltage transformer module and a zero sequence transformer module, wherein the voltage transformer module comprises a primary winding and a secondary winding, the zero sequence transformer module comprises a microcomputer protection device, the secondary winding comprises a metering winding, a measuring winding and a harmonic elimination winding, the metering winding comprises a 1a terminal, a 1b terminal and a 1c terminal, the output ends of the 1a, the 1b and the 1c terminals are all grounded, the measuring winding comprises a 2a terminal, a 2b terminal and a 2c terminal, the output ends of the 2a, the 2b and the 2c terminals are all grounded, the harmonic elimination winding comprises a terminal, a dn1 terminal, a dn2 terminal, a dn3 terminal and a voltage relay KV2, one end of the da is connected in series with a dn1, a, The other ends of the dn2 and the dn3 and da are connected with one end of a voltage relay KV2, the other end of the voltage relay KV2 is connected with one end of a microcomputer protection device dn, and the other end of the microcomputer protection device dn and one end of the dn3 are both grounded.
The utility model has the beneficial effects that: through the design of the separate grounding circuits of the metering winding, the measuring winding and the harmonic elimination winding, when a system breaks down, the metering and the measuring of the voltage transformer cannot be influenced, and the resonance generated by a circuit is still kept to be detected and eliminated, so that the advantages of high working reliability and strong practicability are realized.
The utility model discloses set up as computer protection device still includes measurement wiring end o, measurement output n, voltage relay KV1, the one end of measurement wiring end o is connected to voltage relay KV 1's one end, the one end of measurement output n is connected to voltage relay KV 1's the other end.
The technical scheme has the function of relay protection monitoring, and can automatically alarm when the device finds abnormality or system fault, so that the system can be recovered to normal operation as soon as possible.
Drawings
FIG. 1 is a circuit diagram of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in FIG. 1, the utility model adopts a voltage transformer circuit for metering, which comprises a voltage transformer module and a zero sequence transformer module, wherein the voltage transformer module comprises a primary winding and a secondary winding, the zero sequence transformer module comprises a microcomputer protection device, the secondary winding comprises a metering winding, a measuring winding and a harmonic elimination winding, the metering winding comprises a 1a terminal, a 1b terminal and a 1c terminal, the output end of 1a, the output end of 1b and the output end of 1c are all grounded, the measuring winding comprises a 2a terminal, a 2b terminal and a 2c terminal, the output end of 2a, the output end of 2b and the output end of 2c are all grounded, the harmonic elimination winding comprises a terminal da, a dn1 terminal, a dn2 terminal, a dn3 terminal and a voltage relay KV2, one end of da is connected with a dn1, a dn2 and a dn3 in series, the other end of da is connected with one end of a KV2 voltage relay, the other end of the voltage relay KV2 is connected with one end of a microcomputer protection device dn, and the other end of the microcomputer protection device dn and one end of the dn3 are both grounded.
The microcomputer protection device also comprises a measuring terminal o, a measuring output end n and a voltage relay KV1, wherein one end of the voltage relay KV1 is connected with one end of the measuring terminal o, and the other end of the voltage relay KV1 is connected with one end of the measuring output end n.
According to the embodiment, the voltage transformer circuit for metering has the advantages that through the design of the separated grounding circuit of the metering winding, the measuring winding and the harmonic elimination winding, when a system fails, the metering and the measurement of the voltage transformer are not affected, the resonance generated by a line is kept to be detected and eliminated, and the advantages of high working reliability and strong practicability are realized.
The present invention may be embodied in many other forms without departing from the spirit or essential characteristics thereof, and it should be understood that various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (2)
1. The utility model provides a voltage transformer circuit for measurement, includes voltage transformer module, zero sequence transformer module, voltage transformer module includes primary winding, secondary winding, the zero sequence transformer module includes microcomputer protection device, its characterized in that: the secondary winding comprises a metering winding, a measuring winding and a harmonic elimination winding, the metering winding comprises a 1a terminal, a 1b terminal and a 1c terminal, the output end of the 1a, the output end of the 1b and the output end of the 1c are all grounded, the measuring winding comprises a 2a terminal, a 2b terminal and a 2c terminal, the output end of the 2a, the output end of the 2b and the output end of the 2c are all grounded, the harmonic elimination winding comprises a da terminal, a dn1 terminal, a dn2 terminal, a dn3 terminal and a voltage relay KV2, one end of the da is connected with one end of a dn1, a dn2 and a dn3 in series, the other end of the da is connected with one end of a voltage relay KV2, the other end of the voltage relay KV2 is connected with one end of a microcomputer protection device dn, and the other end of the microcomputer protection device dn and one end of a dn3 are all grounded.
2. The metering voltage transformer circuit of claim 1, wherein: the microcomputer protection device further comprises a measuring terminal o, a measuring output end n and a voltage relay KV1, wherein one end of the voltage relay KV1 is connected with one end of the measuring terminal o, and the other end of the voltage relay KV1 is connected with one end of the measuring output end n.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122948774.5U CN216350908U (en) | 2021-11-25 | 2021-11-25 | Voltage transformer circuit for metering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122948774.5U CN216350908U (en) | 2021-11-25 | 2021-11-25 | Voltage transformer circuit for metering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216350908U true CN216350908U (en) | 2022-04-19 |
Family
ID=81155417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122948774.5U Active CN216350908U (en) | 2021-11-25 | 2021-11-25 | Voltage transformer circuit for metering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216350908U (en) |
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2021
- 2021-11-25 CN CN202122948774.5U patent/CN216350908U/en active Active
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