CN212083523U - Coaxial capacitance voltage division type sleeve type voltage sensor - Google Patents
Coaxial capacitance voltage division type sleeve type voltage sensor Download PDFInfo
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- CN212083523U CN212083523U CN202020562175.2U CN202020562175U CN212083523U CN 212083523 U CN212083523 U CN 212083523U CN 202020562175 U CN202020562175 U CN 202020562175U CN 212083523 U CN212083523 U CN 212083523U
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 29
- 229910052802 copper Inorganic materials 0.000 claims description 29
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Abstract
The utility model provides a coaxial electric capacity partial pressure formula sleeve type voltage sensor, the utility model discloses realize the voltage measurement (protection) that distribution primary and secondary fuses, the function of zero sequence, little signal output need not the secondary conversion, can directly insert secondary equipment through the AD conversion, and effective measuring range is wide, the frequency band of having overcome traditional electromagnetic type sampling device is narrow, the slow shortcoming of response, it is poor also to have overcome pure resistance formula area bearing capacity, the operation generates heat, the shortcoming that transmission cable length can not be tailor, the required installation space of independent type voltage sensor installation and the narrow and small contradiction of switch inner space have also been overcome in addition. The small voltage signal sampling fundamentally eliminates major fault hidden dangers in the operation of the power system, and ensures the safety of personnel and equipment to the greatest extent.
Description
Technical Field
The utility model relates to a distribution network automation sampling technical field, especially a coaxial electric capacity partial pressure formula sleeve type voltage sensor.
Background
In order to meet the requirement of fine management of the national power grid line loss and realize the distribution network branching line loss measurement, a new requirement needs to be provided for a primary equipment current and voltage sensor so as to meet the requirement of measurement precision. With the rapid development of electronic technology, a microcomputer type relay protection device gradually takes a leading position, and in relay protection and measurement, energy flow and information flow of a control part are separated, so that a monitoring device does not need a transformer with high power output for sampling. Meanwhile, due to the rapid development of the power industry and the more complex power grid condition, the intelligent current-voltage transformer for improving the power factor and the quality of the power grid is widely applied. Under the background of the national power grid vigorous development of the primary and secondary fusion technology of the switch on the power distribution column, the standards of the group, namely technical conditions of 10kV and 20kV alternating-current sensors of the power distribution network, general technical conditions of 12kV intelligent switch on the power distribution column and technical specifications of 12kV intelligent switch on the power distribution column, are issued in succession. The voltage sensor technology of each manufacturer has also made great progress, but the current voltage sensor principle mainly focuses on the fields of columnar thin-film capacitor voltage division, columnar ceramic capacitor voltage division and the like, and the integration level of the sensor and the switch is not high.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a coaxial electric capacity partial pressure formula sleeve type voltage sensor aims at solving the not high problem of sensor and switch integrated level among the prior art, realizes set voltage measurement and zero sequence signal, reduces the structure complexity, improves the performance.
In order to achieve the above technical purpose, the utility model provides a coaxial capacitor voltage division formula sleeve type voltage sensor, voltage sensor includes:
the phase sequence low-voltage arm capacitor comprises a phase sequence high-voltage arm capacitor CX1, a phase sequence low-voltage arm capacitor CX2, a zero sequence high-voltage arm capacitor CL1 and a zero sequence low-voltage arm capacitor CL 2;
A. b, C three-phase circuit, each phase circuit is provided with a phase sequence high-voltage arm capacitor CX1, a phase sequence low-voltage arm capacitor CX2 and a zero sequence high-voltage arm capacitor CL 1;
a zero-sequence high-voltage arm capacitor CL1 of the three-phase circuit is connected in parallel and then is connected in series with a zero-sequence low-voltage arm capacitor CL2 to form a zero-sequence voltage circuit.
Preferably, the phase sequence high-voltage arm capacitance CX1 and the zero sequence high-voltage arm capacitance CL1 are annular coaxial ceramic capacitances, and the phase sequence low-voltage arm capacitance CX2 and the zero sequence low-voltage arm capacitance CL2 are NPO ceramic capacitances.
Preferably, the voltage division mode of the voltage sensor is a coaxial capacitance voltage division mode.
Preferably, the voltage sensor is provided with a conductive copper pipe, the conductive copper pipe penetrates through inner holes of the phase sequence high-voltage arm capacitor CX1 and the zero sequence high-voltage arm capacitor CL1 respectively, the conductive copper pipe is fixed with the inner wall of the capacitor through welding, and the high-voltage conductive copper rod penetrates through the conductive copper pipe and is fixed through welding.
Preferably, a section of high-voltage conductive copper bar is exposed out of the top of the voltage sensor shell, and an external thread with the depth of M22 x2 mm is arranged on the high-voltage conductive copper bar and is used for high-voltage lead wiring.
Preferably, the lower part of the voltage sensor is connected with the switch mechanism through a U-shaped copper contact.
The effects provided in the contents of the present invention are only the effects of the embodiments, not all the effects of the present invention, and one of the above technical solutions has the following advantages or advantageous effects:
compared with the prior art, the utility model discloses light in weight, small and installation save space, can install and use on novel post switch, reduce on-the-spot wiring, and the structure is succinct, and the performance is superior. The output of the product is a small voltage signal, the controlled equipment can not be damaged, and the product can be directly interfaced with secondary comprehensive automatic equipment such as instruments and relay protection devices, so that the functions of voltage measurement (protection) and zero sequence of primary and secondary power distribution fusion are realized. The small signal output does not need secondary conversion, can be directly connected into secondary equipment through AD conversion, has wide effective measurement range, overcomes the defects of narrow frequency band and slow response of the traditional electromagnetic sampling device, overcomes the defects of poor load capacity of a pure resistance type belt, heat generation during operation and unthinkable length of a transmission cable, and overcomes the contradiction that the installation space required by the installation of an independent voltage sensor is narrow in the internal space of a switch. The small voltage signal sampling fundamentally eliminates major fault hidden dangers in the operation of the power system, and ensures the safety of personnel and equipment to the greatest extent.
Drawings
Fig. 1 is a structural diagram of a coaxial capacitive voltage divider according to an embodiment of the present invention;
fig. 2 is a structural diagram of a coaxial capacitor voltage-dividing sleeve type voltage sensor provided in an embodiment of the present invention;
fig. 3 is an electrical circuit diagram of a coaxial capacitor voltage-dividing sleeve type voltage sensor provided in an embodiment of the present invention;
in the figure, 1-a conductive copper pipe, 2-a high-voltage arm capacitor for phase sequence, 3-a high-voltage arm capacitor for zero sequence, 4-a signal lead, 5-a high-voltage conductive copper rod, 6-a silicon rubber sleeve, 7-an APG epoxy casting body, 8-a shielding cover, 9-a connecting screw rod, 10-a U-shaped copper contact, 11-a signal lead wiring terminal, 12-a low-voltage arm capacitor and a wiring box.
Detailed Description
In order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments in combination with the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted so as to not unnecessarily limit the invention.
The following describes the coaxial capacitor voltage-dividing sleeve type voltage sensor in detail with reference to the accompanying drawings.
As shown in fig. 1-3, the utility model discloses a coaxial electric capacity partial pressure formula sleeve type voltage sensor, voltage sensor includes:
the phase sequence low-voltage arm capacitor comprises a phase sequence high-voltage arm capacitor CX1, a phase sequence low-voltage arm capacitor CX2, a zero sequence high-voltage arm capacitor CL1 and a zero sequence low-voltage arm capacitor CL 2;
A. b, C three-phase circuit, each phase circuit is provided with a phase sequence high-voltage arm capacitor CX1, a phase sequence low-voltage arm capacitor CX2 and a zero sequence high-voltage arm capacitor CL 1;
a zero-sequence high-voltage arm capacitor CL1 of the three-phase circuit is connected in parallel and then is connected in series with a zero-sequence low-voltage arm capacitor CL2 to form a zero-sequence voltage circuit.
The phase sequence secondary output voltages ua, ub and uc and the zero sequence secondary output voltage u0 are obtained by the circuit under the action of the primary high voltage, and each phase sequence voltage loop is independent.
In order to ensure the output accuracy of the zero-sequence secondary voltage u0, the capacitance value error of the three-phase zero-sequence high-voltage arm capacitor CL1 is within +/-2 pF. The phase sequence high-voltage arm capacitor CX1 and the zero sequence high-voltage arm capacitor CL1 are annular coaxial ceramic capacitors with the capacitance value of 400pF, the phase sequence low-voltage arm capacitor CX2 and the zero sequence low-voltage arm capacitor CL2 are NPO ceramic capacitors, the capacitance value of the phase sequence low-voltage arm ceramic capacitors is 1.23 muF, and the capacitance value of the phase sequence low-voltage arm ceramic capacitors is 1.23 muF at rated operation voltage
The partial pressure ratio obtained below is
The zero sequence low voltage arm film capacitor has a capacitance value of 1.066 muF and operates at rated voltage
The partial pressure ratio obtained below is
The partial pressure transformation ratio of the capacitive voltage divider at (-40 ℃ -70 ℃) meets the requirement of measuring the accuracy of 0.5 grade.
The insulating property of the annular coaxial ceramic capacitor meets the power frequency withstand voltage of 45kV/min, the inner plating layer and the outer plating layer are capacitor bipolar plates, and the annular coaxial ceramic capacitor is made of silver alloy materials, so that the annular coaxial ceramic capacitor is stable in capacitance property, large in loop current design and strong in anti-interference capability. The voltage signal output is linear in the whole measuring range, and the phase sequence and the zero sequence voltage small signal are ensured to be output separately without interference and influence.
And respectively penetrating a conductive copper pipe through inner holes of a phase sequence high-voltage arm capacitor CX1 and a zero sequence high-voltage arm capacitor CL1, fixing the conductive copper pipe and the inner wall of the capacitor by welding, ensuring the concentric position by welding, penetrating a high-voltage conductive copper rod through the conductive copper pipe, and welding and fixing. And fixing the welded parts in an APG (advanced pressure glass) die of the sleeve type voltage sensor, and casting and molding at the high temperature of 140 ℃. A small section of high-voltage conductive copper bar is exposed at the top of the casing of the bushing type voltage sensor, and an external thread with the depth of M22 x2 being 30mm is arranged on the high-voltage conductive copper bar and is used for high-voltage lead wiring. A shielding cover is arranged in the sleeve type voltage sensor, so that the stray capacitance is shielded, and the effect of uniform electric field is also achieved. The lower part of the sleeve type voltage sensor is connected with the switch mechanism through a U-shaped copper contact. The outside parcel silicon rubber sleeve pipe of sleeve pipe type voltage sensor increases shell protection and creepage distance. The phase sequence low-voltage arm capacitor CX2 and the zero sequence low-voltage arm capacitor CL2 are connected through an outer lead and fixed in the switch box body. And a signal of the sensor is led out to the FTU from the wire outlet hole through a five-core double-shielded cable, and the signal tail end of the sensor is connected with a grounding screw rod of the switch shell through the shielded cable. The voltage sensor and the switch outgoing line sleeve are combined into a whole, all functions of the outgoing line sleeve are met, the voltage measurement function is also met, the installation space required by the original voltage sensor in the switch is not needed, the overall size of the switch can be reduced, and the requirement for miniaturization is met.
In the assembling process, the phase-sequence high-voltage arm capacitor CX1 and the zero-sequence high-voltage arm capacitor CL1 are connected as shown in fig. 1 and then fixed on a conductive copper pipe, and then the conductive copper pipe is connected with the high-voltage conductive copper rod in an equipotential manner. And (4) placing the connecting piece into a cavity of an epoxy mold, and injecting epoxy resin into the cavity for curing. Selecting zero-sequence high-voltage arm capacitors CL1 of a three-phase circuit to form a group for electrical connection according to the diagram shown in FIG. 3, testing the output precision of zero-sequence voltage circuit signals, and fine-tuning the precision error through a zero-sequence low-voltage arm capacitor CL 2; the output accuracy of the phase sequence voltage circuit signal is tested, and the accuracy error can be finely adjusted through the phase sequence low-voltage arm capacitor CX 2. The output signal wire is a five-core double-shielded wire, and the five-core marks are Ua +, Ub +, Uc +, U0+ and N.
Voltage sensor's partial pressure mode is coaxial electric capacity partial pressure formula.
The utility model discloses light in weight, small and installation save space, can install and use on novel post switch, reduce the on-the-spot wiring, and the structure is succinct, superior performance. The output of the product is a small voltage signal, the controlled equipment can not be damaged, and the product can be directly interfaced with secondary comprehensive automatic equipment such as instruments and relay protection devices, so that the functions of voltage measurement (protection) and zero sequence of primary and secondary power distribution fusion are realized. The small signal output does not need secondary conversion, can be directly connected into secondary equipment through AD conversion, has wide effective measurement range, overcomes the defects of narrow frequency band and slow response of the traditional electromagnetic sampling device, overcomes the defects of poor load capacity of a pure resistance type belt, heat generation during operation and unthinkable length of a transmission cable, and overcomes the contradiction that the installation space required by the installation of an independent voltage sensor is narrow in the internal space of a switch. The small voltage signal sampling fundamentally eliminates major fault hidden dangers in the operation of the power system, and ensures the safety of personnel and equipment to the greatest extent.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A coaxial capacitive voltage divider sleeve-type voltage sensor, the voltage sensor comprising:
the phase sequence low-voltage arm capacitor comprises a phase sequence high-voltage arm capacitor CX1, a phase sequence low-voltage arm capacitor CX2, a zero sequence high-voltage arm capacitor CL1 and a zero sequence low-voltage arm capacitor CL 2;
A. b, C three-phase circuit, each phase circuit is provided with a phase sequence high-voltage arm capacitor CX1, a phase sequence low-voltage arm capacitor CX2 and a zero sequence high-voltage arm capacitor CL 1;
a zero-sequence high-voltage arm capacitor CL1 of the three-phase circuit is connected in parallel and then is connected in series with a zero-sequence low-voltage arm capacitor CL2 to form a zero-sequence voltage circuit.
2. The coaxial capacitive voltage-dividing sleeve type voltage sensor according to claim 1, wherein the phase sequence high-voltage arm capacitance CX1 and the zero sequence high-voltage arm capacitance CL1 are annular coaxial ceramic capacitors, and the phase sequence low-voltage arm capacitance CX2 and the zero sequence low-voltage arm capacitance CL2 are NPO ceramic capacitors.
3. The coaxial capacitive voltage divider sleeve-type voltage sensor of claim 1, wherein the voltage division mode of the voltage sensor is coaxial capacitive voltage division.
4. The coaxial capacitive voltage-dividing sleeve type voltage sensor according to claim 1, wherein the voltage sensor is provided with a conductive copper pipe, the conductive copper pipe respectively passes through the inner holes of the phase sequence high-voltage arm capacitance CX1 and the zero sequence high-voltage arm capacitance CL1, the conductive copper pipe is fixed with the inner wall of the capacitor by welding, and the high-voltage conductive copper rod passes through the conductive copper pipe and is fixed by welding.
5. The coaxial capacitive voltage divider sleeve type voltage sensor according to claim 1, wherein a section of high voltage conductive copper rod is exposed from the top of the voltage sensor housing, and an external thread M22 x2 mm deep is provided on the high voltage conductive copper rod for connecting high voltage leads.
6. The coaxial capacitive voltage divider sleeve-type voltage sensor of claim 1, wherein the lower side of the voltage sensor is connected to the switching mechanism through a U-shaped copper contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020562175.2U CN212083523U (en) | 2020-04-16 | 2020-04-16 | Coaxial capacitance voltage division type sleeve type voltage sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020562175.2U CN212083523U (en) | 2020-04-16 | 2020-04-16 | Coaxial capacitance voltage division type sleeve type voltage sensor |
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| CN202020562175.2U Active CN212083523U (en) | 2020-04-16 | 2020-04-16 | Coaxial capacitance voltage division type sleeve type voltage sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113433374A (en) * | 2021-07-05 | 2021-09-24 | 中国电力科学研究院有限公司武汉分院 | Three-phase zero-sequence voltage sensor and voltage measurement method |
| CN113848362A (en) * | 2021-10-22 | 2021-12-28 | 江苏靖江互感器股份有限公司 | Ceramic capacitor voltage division type phase zero sequence voltage sensor |
-
2020
- 2020-04-16 CN CN202020562175.2U patent/CN212083523U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113433374A (en) * | 2021-07-05 | 2021-09-24 | 中国电力科学研究院有限公司武汉分院 | Three-phase zero-sequence voltage sensor and voltage measurement method |
| CN113848362A (en) * | 2021-10-22 | 2021-12-28 | 江苏靖江互感器股份有限公司 | Ceramic capacitor voltage division type phase zero sequence voltage sensor |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Zhongguancun Technology Leasing Co., Ltd Assignor: BEIJING HEXINRUITONG ELECTRIC POWER TECHNOLOGY Co.,Ltd. Contract record no.: X2021980012290 Denomination of utility model: Coaxial capacitance voltage dividing type bushing type voltage sensor Granted publication date: 20201204 License type: Exclusive License Record date: 20211112 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Coaxial capacitance voltage dividing type bushing type voltage sensor Effective date of registration: 20211115 Granted publication date: 20201204 Pledgee: Zhongguancun Technology Leasing Co., Ltd Pledgor: BEIJING HEXINRUITONG ELECTRIC POWER TECHNOLOGY Co.,Ltd. Registration number: Y2021980012578 |