CN217561600U - Zero sequence voltage sensor with voltage regulator - Google Patents
Zero sequence voltage sensor with voltage regulator Download PDFInfo
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- CN217561600U CN217561600U CN202220727543.3U CN202220727543U CN217561600U CN 217561600 U CN217561600 U CN 217561600U CN 202220727543 U CN202220727543 U CN 202220727543U CN 217561600 U CN217561600 U CN 217561600U
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Abstract
The utility model discloses a zero sequence voltage sensor with a voltage regulator, belonging to the field of distribution network automation, comprising three-phase voltages for outputting secondary signals and a zero sequence voltage sensor for outputting zero sequence voltage secondary signals; the zero-sequence voltage sensor comprises a capacitive voltage divider and a voltage regulator; the voltage regulator is connected between capacitive voltage divider and secondary signal receiving terminal and three capacitive voltage divider corresponds the opening of voltage regulator forms the triangular connection, integrates the voltage regulator to sensor secondary signal output side, effectively improves sensor precision and extends measuring range, because of miniature voltage regulator's regulatory function, can omit the screening process, improves and makes the qualification rate and reduce manufacturing cost.
Description
Technical Field
The utility model belongs to distribution network automation field especially relates to a zero sequence voltage sensor with voltage regulator.
Background
With the proposition and popularization of the smart grid concept, the smart voltage sensor different from the traditional voltage transformer is widely valued and applied. However, when the high-voltage fluctuation of the existing voltage sensor is too large, the voltage exceeds the signal transmission range of the sensor, so that subsequent detection equipment has overvoltage risks and overrange working risks. In order to ensure that the error precision of the zero-sequence voltage is within a controllable range, the extremely low qualification rate of the sensor and a large amount of product waste are caused by the process of screening similar capacitance values in the manufacturing process, and a zero-sequence voltage sensor with a voltage regulator is needed.
SUMMERY OF THE UTILITY MODEL
The utility model provides an integrate the voltage regulator to sensor secondary signal output side, effectively improve sensor precision and extend measuring range, because of the regulatory function of miniature voltage regulator, can omit the screening process, improve the zero sequence voltage sensor who has the voltage regulator of manufacturing qualification rate and reduction in production cost.
The utility model provides a technical scheme that its technical problem adopted is:
a zero sequence voltage sensor with a voltage regulator comprises three-phase voltages for outputting secondary signals and a zero sequence voltage sensor for outputting a zero sequence voltage secondary signal; the zero-sequence voltage sensor comprises a capacitive voltage divider and a voltage regulator; the voltage regulator is connected between capacitive voltage divider and secondary signal receiving end and three capacitive voltage divider corresponds the opening of voltage regulator forms the triangular connection.
As a further improvement of the above technical solution, the voltage regulator includes a voltage regulating unit and a transformer; one side of the voltage regulating unit is connected with the high-voltage end of the capacitive voltage divider, and the other side of the voltage regulating unit is connected with the high-voltage coil of the transformer; the accuracy of the sensor can be improved and the signal transmission range of the voltage sensor in the measurement range can be adjusted.
As a further improvement of the above technical solution, the transformer further comprises a miniature iron core, a high-voltage coil and a low-voltage coil; the high-voltage coil and the low-voltage coil are wound on the same miniature iron core; the number of turns in the access line is adjusted through the adjusting unit to effectively improve the accuracy of the sensor and expand the measuring range.
As a further improvement of the above technical solution, the capacitive voltage divider is a film-wound capacitor and adopts a coaxial winding and step-type arrangement; the high-voltage capacitor and the low capacitor of the film winding type capacitor are of an integrated structure; the film winding type capacitors are provided with a plurality of capacitors which are connected in series; effectively optimize sensor structure, reduce sensor installation space and occupy, realize and join in marriage the inside of net post upper circuit breaker.
As a further improvement of the above technical solution, the low-voltage coil includes a phase voltage winding and a zero-sequence voltage winding; the high-voltage outlet end of the phase voltage winding is connected with a phase voltage positive electrode interface of the test instrument, and the zero-sequence voltage winding and the other two-phase zero-sequence voltage winding are connected by adopting an open triangle and output three-phase zero-sequence voltage; and the error precision of the sensor is improved.
As a further improvement of the above technical scheme, a plurality of groups of taps and gear shifting knobs are arranged on the high-voltage coil; the gear shifting knob is rotated to change the number of turns of the high-voltage coil, adjust the voltage amplitude of the capacitor voltage-dividing sleeve and not change the phase voltage phase; effectively expand sensor signal transmission range.
As a further improvement of the technical scheme, the voltage regulating unit is a plurality of groups of windings with different turns, and the phase voltage transformation ratio of the zero-sequence voltage sensor is
Zero sequence voltage transformation ratio of
According to the technical scheme provided by the utility model, the beneficial effects are that: the sensor is provided with a voltage regulator, one end of the voltage regulator is connected with a capacitance voltage divider, and the other end of the voltage regulator is connected with a transformer, so that the accuracy of the sensor can be improved, and the signal transmission range of the voltage sensor in the measurement range can be adjusted. The zero sequence voltage sensor can omit a screening process due to the adjusting function of the miniature voltage regulator, improve the manufacturing qualification rate and reduce the production cost. By adopting the cooperation of the micro voltage regulator and the micro transformer, the compensation resistor and the capacitor in the traditional voltage sensor are simplified, the type and the number of electronic components are simplified by the whole circuit, the whole power loss of the sensor is reduced, and the measurement accuracy is improved. The bushing type film capacitor partial pressure that voltage sensor adopted, and high-pressure arm electric capacity and the coaxial integral type of low pressure arm are convoluteed, effectively optimize sensor structure, reduce the sensor installation space and occupy, realize and join in marriage the inside of net post upper circuit breaker. The film capacitor adopts a new material polyester film to replace the traditional polypropylene film, and has small capacitance temperature coefficient and good temperature performance.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a single-phase voltage sensor electrical circuit diagram of a voltage regulator.
Fig. 2 is an electrical circuit diagram of a three-phase zero-sequence voltage sensor of the voltage regulator.
In the drawings, the components represented by the respective reference numerals are listed below: 1 a capacitive voltage divider; 2 a voltage regulating unit; 3, a transformer; 4, a high-voltage coil; 5, a miniature iron core; 6, a low-voltage coil; 7 voltage regulator.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments, and obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of this patent.
Referring to fig. 1 and 2, the utility model provides a zero sequence voltage sensor with a micro voltage regulator, which is a zero sequence voltage sensor for outputting three-phase voltages of secondary signals and outputting the secondary signals of the zero sequence voltage; three zero sequence voltage sensor sensors realize secondary signal output (ua ub uc) of A, B and C three-phase voltage and secondary signal output (u) of zero sequence voltage through an open triangle 0 ) (ii) a The method is applied to a secondary fusion column switch device; comprises a capacitive voltage divider 1 and a voltage regulator 7; the miniature voltage regulator 7 comprises a voltage regulating unit 2 and a transformer 3; the transformer 3 includes a high-voltage coil 4, a micro-core 5, and a low-voltage coil 6.
Specifically, the voltage regulating unit 2 is composed of a plurality of groups of windings with different turns, and is wound on a transformer 7 composed of a high-voltage coil 4, a miniature iron core 5 and a low-voltage coil 6 together. One end of the voltage regulating unit 2 is connected with the capacitive voltage divider 1, the other end of the voltage regulating unit 2 is integrated to the secondary signal output side of the sensor, and the number of turns of the voltage regulating unit 2 in an access line is regulated to effectively improve the precision of the sensor and expand the measurement range. Due to the adjusting function of the micro-voltage regulator, the screening process can be omitted, the manufacturing qualification rate is improved, and the production cost is reduced. The high-voltage coil 4 and the low-voltage coil 6 are wound on the same miniature iron core 5 together. The low-voltage coil is divided into a phase voltage winding and a zero-sequence voltage winding. The high-voltage outlet end of the phase voltage winding is connected with a phase voltage positive electrode interface (u) of the test instrument a u b u c ) The zero-sequence voltage winding is connected with the other two-phase zero-sequence voltage winding by adopting an open triangle to output three-phase zero-sequence voltage (u) 0 )。
The voltage regulator 7 is connected between the capacitive voltage divider 1 and the secondary signal receiving end, and can adjust the number of turns of a winding in an access circuit through a gear shifting knob, so that the secondary signal precision of the zero sequence sensor is improved, and the secondary signal transmission measurement range of the sensor is expanded.
The capacitive voltage divider 1 is a film-wound capacitive voltage divider. The film winding type capacitor voltage division adopts a plurality of small film capacitors connected in series, and the high-voltage capacitor (C1) and the low capacitor (C2) are integrated to realize continuous voltage division. Compared with the traditional capacitive sensor, the zero sequence capacitor and the phase sequence capacitor of the sensor share the voltage divider capacitive voltage divider 1, and the zero sequence high-voltage arm capacitor and the zero sequence low-voltage arm capacitor are omitted. And then the micro voltage regulator 7 is integrated to realize the output of small voltage signals.
The high-voltage coil is provided with a plurality of groups of taps (such as X0-X4 in the example of figure 1) and a gear shifting knob to jointly form a voltage regulating unit. The number of turns of a high-voltage coil connected into a circuit is changed by rotating a gear shifting knob, the voltage amplitude of a capacitor voltage-dividing sleeve is adjusted, and the phase voltage phase is not changed. When high voltage u of capacitive divider a The fluctuation is too large, the capacitance voltage division value can be adjusted through the miniature voltage adjusting unit R, so that the secondary voltage signal u output by the final sensor can still be detected by a measuring instrument, and the signal transmission range of the sensor is effectively expanded.
In the above embodiment, the zero sequence voltage sensor is formed by connecting three single-phase voltage sensors. The zero sequence voltage error accuracy is related to the capacitance of the capacitor voltage division. The capacitance values of the three phases are the same, the amplitude values of the partial pressure are the same, and the zero sequence voltage is one third of the partial pressure of each phase. However, only sensors with similar capacitance values can be selected to assemble a zero sequence voltage sensor in the production process, the product precision is poor, and the industrial waste is serious. The utility model discloses can omit and select similar electric capacity process, different partial pressure amplitude revises to similar through miniature pressure regulating unit, improves and makes qualification rate and reduction in production cost.
When in use, the micro voltage regulator comprises three-phase micro transformers A, B and C, an adjusting knob and an adjusting machine component. The metal shell is filled with epoxy resin for insulation. Finally, the small voltage signal of the sensor is output through a six-core shielding wire. The capacitance value of the capacitive voltage divider 1 is within the range of 550NF, when the positive error of the single-phase output secondary voltage signal is too large, the gear is changed by adjusting the voltage regulating knob, more coil turns are connected into the circuit, the transformation ratio of the transformer is changed, the amplitude of u can be reduced, and the error precision of the sensor is improved. When the negative error of the single-phase output secondary voltage signal is too large, the voltage regulating knob is adjusted to change the gear, so that fewer turns of the coil are connected into the circuit, the transformation ratio of the transformer is changed, the amplitude of u can be increased, and the error precision of the sensor is improved.
Each phase of capacitance voltage divider 1 is a film capacitor and adopts a coaxial winding and ladder type arrangement mode. The films are all polyester films, and the capacitance value changes little with the temperature. The transformation ratio is stable within the range of-40 ℃ to 70 ℃. Under normal working of the sensor, the error range meets the requirement of 0.5 (3P) precision.
The transformer 3 adopts a microcrystal iron core, so that the saturation point of the iron core is improved, the damping resistance of a secondary side is omitted, and the ferromagnetic resonance effect cannot occur integrally. The transformer finally realizes the phase voltage transformation ratio of
Zero sequence voltage transformation ratio of
The sensor of (1).
The utility model discloses collection protection, measurement function are trinity, are applicable to and join in marriage net a secondary and fuse column switch device. The utility model discloses a zero sequence circuit sharing phase sequence partial pressure electric capacity, signal output and accuracy control are accomplished to the miniature voltage regulator of cooperation, consequently leave out compensation type electronic components, simplify electric circuit, reduce the functional loss, avoid ferromagnetic resonance to take place. The miniature voltage regulator improves the accuracy of the sensor by shifting gears and adjusts the signal transmission range of the voltage sensor in the measurement range.
The terms "upper", "lower", "outside", "inside" and the like in the description and claims of the present invention and the above drawings are used for distinguishing relative relationships in positions, if any, and are not necessarily given qualitatively. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A zero sequence voltage sensor with a voltage regulator is characterized by comprising three-phase voltages for outputting secondary signals and a zero sequence voltage sensor for outputting a zero sequence voltage secondary signal; the zero-sequence voltage sensor comprises a capacitive voltage divider and a voltage regulator; the voltage regulator is connected between capacitive voltage divider and secondary signal receiving end and three capacitive voltage divider corresponds the opening of voltage regulator forms the triangular connection.
2. The zero sequence voltage sensor with voltage regulator of claim 1, wherein the voltage regulator comprises a voltage regulating unit and a transformer; one side of the voltage regulating unit is connected with the high-voltage end of the capacitive voltage divider, and the other side of the voltage regulating unit is connected with the high-voltage coil of the transformer.
3. The zero sequence voltage sensor with voltage regulator of claim 2, wherein the transformer further comprises a micro core and high and low voltage coils; and the high-voltage coil and the low-voltage coil are wound on the same miniature iron core.
4. The zero sequence voltage sensor with a voltage regulator of claim 3, wherein the capacitive voltage divider is a film wound capacitor and employs a co-axial wound, stepped arrangement.
5. The zero sequence voltage sensor with the voltage regulator according to claim 4, wherein the high voltage capacitor and the low capacitor of the film-wound capacitor are an integral structure; the film winding type capacitors are provided with a plurality of capacitors which are connected in series.
6. The zero sequence voltage sensor with voltage regulator of claim 5, wherein the low voltage coil comprises a phase voltage winding and a zero sequence voltage winding; and the high-voltage outlet end of the phase voltage winding is connected with a phase voltage positive electrode interface of the test instrument, and the zero-sequence voltage winding and the other two-phase zero-sequence voltage winding are connected by adopting an open triangle and output three-phase zero-sequence voltage.
7. The zero-sequence voltage sensor with a voltage regulator according to claim 6, wherein a plurality of groups of taps and shift knobs are arranged on the high-voltage coil; the rotary gear shifting knob is used for changing the number of turns of the high-voltage coil, adjusting the voltage amplitude of the capacitor voltage-dividing sleeve and not changing the phase of the phase voltage.
8. The zero-sequence voltage sensor with voltage regulator of claim 7, wherein the voltage regulating unit is a plurality of windings with different turns, and the phase voltage transformation ratio of the zero-sequence voltage sensor is
Zero sequence voltage transformation ratio of
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220727543.3U CN217561600U (en) | 2022-03-30 | 2022-03-30 | Zero sequence voltage sensor with voltage regulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220727543.3U CN217561600U (en) | 2022-03-30 | 2022-03-30 | Zero sequence voltage sensor with voltage regulator |
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| Publication Number | Publication Date |
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| CN217561600U true CN217561600U (en) | 2022-10-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220727543.3U Active CN217561600U (en) | 2022-03-30 | 2022-03-30 | Zero sequence voltage sensor with voltage regulator |
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| CN (1) | CN217561600U (en) |
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- 2022-03-30 CN CN202220727543.3U patent/CN217561600U/en active Active
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