CN104655897A - Thermal convection voltage divider - Google Patents
Thermal convection voltage divider Download PDFInfo
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- CN104655897A CN104655897A CN201510080146.6A CN201510080146A CN104655897A CN 104655897 A CN104655897 A CN 104655897A CN 201510080146 A CN201510080146 A CN 201510080146A CN 104655897 A CN104655897 A CN 104655897A
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Abstract
The invention relates to a thermal convection voltage divider which comprises an insulating cylinder, wherein hollow insulation and convection support cylinders are mounted in the insulating cylinder, convection channels are formed in the insulation and convection support cylinders, a piezometer ring is connected to the top of the insulating cylinder through a flange, the bottom of the insulating cylinder is mounted on a base through a flange, the flanges are coaxially arranged with the insulation and convection support cylinders, flange convection holes communicated with the convection channels are formed in the flanges, and air convection gaps are formed between the flange at the top of the insulating cylinder and the piezometer ring and between the flange at the bottom of the insulating cylinder and the base respectively. The hollow insulation and convection support cylinders are mounted in the insulating cylinder, the convection channels are formed in the insulation and convection support cylinders, the flange convection holes communicated with the convection channels are formed in the flanges at two ends of the insulating cylinder, accordingly, after Joule heat produced by the voltage divider is transferred to the insulation and convection support cylinders, the Joule heat is circularly taken away through the convection channels and the flange convection holes, and the heat dissipation purpose is achieved.
Description
[technical field]
The present invention relates to a kind of voltage divider, particularly a kind of heat loss through convection voltage divider.
[background technology]
High pressure, high precision, heat loss through convection voltage divider are high voltage ac/dc voltage measurement basic devices, are the key devices in AC/DC Power System and high-accuracy sampling device.Typical apply is high pressure, extra-high voltage alternating current-direct current voltage precision dividing potential drop fields of measurement.China's high pressure, extra-high voltage alternating current-direct current power transmission and transformation system require that voltage measurement accuracy is generally 0.2 grade, and the voltage measurement accuracy in laboratory (0.1-0.01 level) can be higher.So far China's alterating and direct current pressure measuring device fills SF after installing resistor and capacitor in " totally-enclosed cavity "
6(or filling other material) version, as my company develop ± 800kV and ± the high-accuracy noninductive resistance unit of 1100kV direct current electronic voltage transformer high pressure, adopt exactly traditional " totally-enclosed cavity ", working current 2mA.As applying rated power energising 1.5h, power-off 0.5h, during 24 cycle of continuing, temperature difference △ t=70 DEG C during applying rated power energising 1.5h inside and outside " totally-enclosed cavity ", and environment temperature is high-end 50 DEG C, finally " totally-enclosed cavity " temperature can be raised to about 120 DEG C, far exceeds the electric capacity ceiling temperature 90 DEG C of use.The aspects such as resistance, electric capacity, insulating material thermal stability, electric-field intensity distribution are mainly concentrated on for head it off mentality of designing.
Comprehensive many-sided influence factor, adopts Rational structure, can improve combined-voltage measuring accuracy, reduces time, environmental temperature effect to the impact of whole system; Adopt Rational structure to make systematic survey Primary Component hot(test)-spot temperature can not exceed the running temperature (90 DEG C) of capacitance resistance ware permission simultaneously, guarantee system is run reliably and with long-term, avoid because above-mentioned reason causes the performance of Partial key device, insulating material to reduce, even cause system external insulation to puncture and the accident caused.
[summary of the invention]
The object of the present invention is to provide a kind of heat loss through convection voltage divider, be applicable to the precision measurement of high voltage ac/dc voltage, dividing potential drop sampling, improve reliability and the accuracy of sampling system.
For reaching above object, the present invention adopts following technical scheme to be achieved.
A kind of heat loss through convection voltage divider, comprise insulating cylinder, the insulation convection current support tube of hollow is installed in this insulating cylinder, the insulating material of solid is filled in space between described insulating cylinder and insulation convection current support tube, insulation convection current support tube inside is convection channel, there is grading ring at the top of described insulating cylinder by Flange joint, be arranged on base by flange bottom described insulating cylinder, described flange is coaxially arranged with insulation convection current support tube, and described flange offers the flange convection holes communicated with convection channel, cross-ventilation gap is formed respectively between flange between the flange at described insulating cylinder top and grading ring and bottom insulating cylinder and base.
Described flange convection holes is symmetrical arranged with flange center's line.
Described cross-ventilation gap is suitable with insulating cylinder external diameter in the size of insulating cylinder radial direction.
Described insulating cylinder is that more piece insulating cylinder is in series, and wherein, what bottommost was connected with base one saves the low-voltage arm unit that insulating cylinder and internal part form voltage divider, and other insulating cylinder and internal part form high-voltage arm unit.
By Flange joint between described adjacent insulating cylinder, all flanges include inner flange and outside flange, and wherein, all interior outside flanges are metal material and make, and are connected between interior outside flange by insulating isolation ring.
The flange center position being positioned at the insulating cylinder top at time top is all provided with internode web member, and this internode web member adopts metallic resilient material to make.
Be provided with Pinch Resistor between described insulating cylinder and insulation convection current support tube, the two ends of this Pinch Resistor are connected with outside flange respectively.
The annular space that insulating cylinder and insulation convection current support tube are formed is divided into interior space and the external space by described Pinch Resistor, wherein, is the external space between Pinch Resistor and insulating cylinder, is interior space between Pinch Resistor and insulation convection current support tube; The described external space is in axial direction provided with insulation support body and equalizing capacitor.
The inwall of described insulation convection current support tube is provided with detent projection tooth, to increase area of dissipation and creepage distance.
Compared with prior art, beneficial effect of the present invention: the present invention is provided with the insulation convection current support tube of hollow in insulating cylinder, this insulation convection current support tube inside is convection channel, the flange convection holes communicated with convection channel offered by the inner flange at insulating cylinder two ends, like this, after the Joule heat that voltage divider produces is transmitted to insulation convection current support tube, is taken away by convection channel and the circulation of inner flange convection holes, reach the object of heat loss through convection.
[accompanying drawing explanation]
Fig. 1 is the structural representation of heat loss through convection voltage divider of the present invention.
Fig. 2 is the structure for amplifying schematic diagram of Fig. 1 centre circle part A.
Fig. 3 is the structural representation of the internode web member of Fig. 1 centre circle B.
Fig. 4 is the structure for amplifying schematic diagram of Fig. 1 centre circle C part.
In figure: 1---grading ring; 2---cross-ventilation gap; 3---high-pressure side terminal; 4---inner flange; 5---outside flange; 6---equalizing capacitor; 7---insulation convection current support tube; 8---voltage grading resistor; 9---convection channel; 10---inner flange convection holes; 11---Pinch Resistor; 12---insulating cylinder; 13---full skirt; 14---set bolt; 15---insulating isolation ring; 16---low-voltage arm unit; 17---connects base metal flange; 18---base; 19---divides pressure side leading-out terminal; 20---ground terminal; 21---internode web member; 22---insulation support body; Space in 23---; The 24---external space.
[embodiment]
With reference to the accompanying drawings voltage divider of the present invention is elaborated below.
Fig. 1 is the structural representation of voltage divider of the present invention.In figure, circle represents the part that will amplify.Fig. 2 is the structure for amplifying schematic diagram of Fig. 1 centre circle part A.Demonstrate 3 mounting screws in figure inner flange is connected with grading ring (metal material) with outside flange simultaneously, achieve high-pressure side resistor assembly and isolate being communicated with of supporting component.Fig. 3 is the structural representation of Fig. 1 centre circle part B.Fig. 4 is the structure for amplifying schematic diagram of Fig. 1 centre circle C part, mainly shows low-voltage arm unit, point pressure side leading-out terminal and low pressure end resistor assembly and the structure such as to be communicated with of isolating supporting component.
Refer to shown in Fig. 1 to Fig. 4, voltage divider of the present invention comprises grading ring 1, high-voltage arm unit, low-voltage arm unit, and base 18.Described high-voltage arm unit is several, and described low-voltage arm unit is one.Described high-voltage arm unit is drawn by high-pressure side terminal 3, and described low-voltage arm unit is exported and drawn by a point pressure side leading-out terminal 19.
Described high-voltage arm unit and low-voltage arm have included insulating cylinder 12, described in be positioned at the high-pressure side of top high-voltage arm insulating cylinder 12 top described grading ring 1 is installed, described low-voltage arm insulating cylinder 12 is arranged on base 18.
The insulating cylinder 12 of top is connected with grading ring 1 by metal flange, and described metal flange comprises inner flange 4 and outside flange 5, and this inner flange 4 and outside flange 5 are separated by insulating isolation ring, and shown outside flange 5 is fixedly connected with grading ring 1 by set bolt; The insulating cylinder 12 of described low-voltage arm is connected with base 18 by connecting base metal flange 17, and described connection base metal flange 17 comprises inner flange 4 and outside flange 5.Inside and outside flange is that metal material is made.
The inner flange being positioned at each insulating cylinder 12 upper end at time top is provided with internode web member 21, this internode web member 21 is made with metallic resilient material, like this, when the insulating cylinder 12 of top is arranged on next joint insulating cylinder 12, described internode web member 21 is depressed thus realizes the connection of upper and lower resistor assembly.In addition, the insulating isolation ring 15 made by bakelite between each inner flange and outside flange separates; Described outside flange 5 is fixedly connected with by set bolt 14 in the position of insulating cylinder 12 outside, realizes the connection isolating supporting component up and down.
Each joint insulating cylinder 12 inside is all provided with the insulation convection current support tube 7 of hollow, insulation convection current support tube 7 inside is convection channel 9, insulation convection current support tube 7 outer wall is provided with voltage grading resistor 8, and this voltage grading resistor 8 adopts the noninductive precision resistor of high pressure, and deburring after serial connection; The performance of high pressure is noninductive precision resistor directly determines the performance of voltage divider.Described inner flange 4 is arranged on insulation convection current support tube 7 top and bottom and coaxially arranges with insulation convection current support tube 7, and described inner flange 4 offers the inner flange convection holes 10 communicated with the convection channel 9 of the convection current support tube 7 that insulate.
The coefficient of heat conductivity of described insulation convection current support tube 7 is higher than SF
6coefficient of heat conductivity more than ten times.In addition, the inwall of described insulation convection current support tube 7 is provided with detent projection tooth, to increase area of dissipation and creepage distance.
Annular space between described insulation convection current support tube 7 and insulating cylinder 12 is filled with the insulating medium of solid, this annular space is divided into two parts by Pinch Resistor 11 at axial direction, space between described Pinch Resistor 11 and insulating cylinder 12 is the external space 24, space between Pinch Resistor 11 and insulation convection current support tube 7 is interior space 23, is in axial direction provided with insulation support body 22 and equalizing capacitor 6 in the described external space.Described interior space 23 and the external space 24 are separate sealings, and described interior space 23 and the external space 24 are filled with the insulating material of solid.
The top of described Pinch Resistor 11 is connected with high-pressure side, lower end is connected to ground, can be connected with the Pinch Resistor at position, place for the outside flange of different parts of dismounting, the clamper current potential of outside flange, makes the current potential of whole outside flange identical with voltage divider Potential distribution.
Described equalizing capacitor selects high-voltage capacitor, and most high-temperature resistant 90 DEG C, plays all pressure effects; Described Pinch Resistor is realized isolating with extraneous by voltage grading resistor, provides one not by " purification " environment that ambient humidity, filth, flange to expose etc. to affect for bearing dividing potential drop " resistor assembly ".
In patent of the present invention, described insulation convection current support tube 7, voltage grading resistor 8, and inner flange forms resistor assembly jointly; The full skirt 13 of described equalizing capacitor 6, Pinch Resistor 11, insulating cylinder 12, insulating cylinder outer wall, internode web member 21, insulation support body 22, and outside flange 5 forms isolation supporting component jointly.After the Joule heat that described resistor assembly produces is transmitted to insulation convection current support tube 7, is taken away by convection channel 9 and inner flange convection holes 10 circulation, reach the object of heat radiation.
Resistor assembly of the present invention is connected to inner flange 4.Resistor assembly in several high-voltage arm unit and a low-voltage arm unit is connected to each other by internode web member 21; Isolation supporting component is connected to outside flange.Isolation supporting component in several high-voltage arm unit and a low-voltage arm unit is connected to each other by set bolt.Inner flange is connected by insulating isolation ring 15 with outside flange, makes resistor assembly and the extraneous electric isolution formed physically.
Described high-voltage arm unit mainly comprises by the resistor assembly bonded together by insulating isolation ring 15 and isolation supporting component, and insulating isolation ring 15 ensure that resistor assembly and isolation supporting component are electric isolution physically.Connection between described high-voltage arm unit is connected with set bolt by outside flange 5, and be interconnected by set bolt 15 between the isolation supporting component of the high-voltage arm unit after connection, resistor assembly is connected by internode web member 21.
Electric isolution physically of the present invention refers to: in same joint high-voltage arm unit or whole voltage divider, the resistor assembly bearing dividing potential drop with bear clamper, isolation, all press, be connected, the isolation supporting component that supports is electric isolution physically mutually, only at high-pressure side and the ground end of voltage divider, resistor assembly is communicated with isolation supporting component.
Alternating current-direct current voltage divider of the present invention is as requested by first segment, second section ... the formations such as grading ring 1, low-voltage arm unit, base are mixed in n-th joint high-voltage arm unit docking.Together with 1 to n joint resistor assembly and low-voltage arm unit of this voltage divider is connected to each other by internode web member 21; Equally, 1 to n joint isolation supporting component of this voltage divider is connected to each other together by set bolt 14; Only be communicated with isolation supporting component with ground end resistor assembly at high-pressure side.The resistor assembly that N saves resistor assembly and low-voltage arm assembly bears a point compression functions; Isolation supporting component is born clamper, isolation, all presses, is connected, support function.
In voltage divider arrangement of the present invention, that fills in the annular space (interior space 23 and the external space 24) of insulating cylinder is the insulating material of solid and mutually seals, make factors such as there is not leakage when dismounting and use, make moist, only have convection channel and skirt umbrella to communicate with the external world.
Claims (9)
1. a heat loss through convection voltage divider, it is characterized in that: comprise insulating cylinder (12), the insulation convection current support tube (7) of hollow is installed in this insulating cylinder, the insulating material of solid is filled in space between described insulating cylinder and insulation convection current support tube, insulation convection current support tube inside is convection channel (9), there is grading ring (1) at the top of described insulating cylinder by Flange joint, be arranged on base (18) by flange bottom described insulating cylinder, described flange is coaxially arranged with insulation convection current support tube, and described flange offers the flange convection holes (10) communicated with convection channel, flange between the flange at described insulating cylinder top and grading ring and bottom insulating cylinder and be formed with cross-ventilation gap (2) respectively between base.
2. a kind of heat loss through convection voltage divider according to claim 1, is characterized in that: described flange convection holes is symmetrical arranged with flange center's line.
3. a kind of heat loss through convection voltage divider according to claim 1, is characterized in that: described cross-ventilation gap (2) is suitable with insulating cylinder external diameter in the size of insulating cylinder radial direction.
4. a kind of heat loss through convection voltage divider according to claim 1, it is characterized in that: described insulating cylinder is that more piece insulating cylinder is in series, wherein, what bottommost was connected with base one saves the low-voltage arm unit that insulating cylinder and internal part form voltage divider, and other insulating cylinder and internal part form high-voltage arm unit.
5. a kind of heat loss through convection voltage divider according to claim 4, it is characterized in that: between described adjacent insulating cylinder, pass through Flange joint, all flanges include inner flange and outside flange, wherein, all inside and outside flanges are metal material and make, and are connected between inside and outside flange by insulating isolation ring (15).
6. a kind of heat loss through convection voltage divider according to claim 5, is characterized in that: the flange center position being positioned at the insulating cylinder top at time top is all provided with internode web member (21), and this internode web member adopts metallic resilient material to make.
7. a kind of heat loss through convection voltage divider according to claim 4 or 5, is characterized in that: be provided with Pinch Resistor (11) between described insulating cylinder and insulation convection current support tube, the two ends of this Pinch Resistor respectively with Flange joint.
8. a kind of heat loss through convection voltage divider according to claim 7, it is characterized in that: the annular space that insulating cylinder and insulation convection current support tube are formed is divided into interior space (23) and the external space (24) by described Pinch Resistor, wherein, being the external space between Pinch Resistor and insulating cylinder, is interior space between Pinch Resistor and insulation convection current support tube; The described external space is in axial direction provided with insulation support body (22) and equalizing capacitor (6).
9. a kind of heat loss through convection voltage divider according to claim 1, is characterized in that: the inwall of described insulation convection current support tube is provided with detent projection tooth, to increase area of dissipation and creepage distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510080146.6A CN104655897B (en) | 2015-02-13 | 2015-02-13 | A kind of heat loss through convection divider |
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| CN201510080146.6A CN104655897B (en) | 2015-02-13 | 2015-02-13 | A kind of heat loss through convection divider |
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| CN104655897A true CN104655897A (en) | 2015-05-27 |
| CN104655897B CN104655897B (en) | 2017-08-01 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092927A (en) * | 2015-09-11 | 2015-11-25 | 广东电网有限责任公司电力科学研究院 | Self-calibration high precision AC-DC voltage divider |
| CN105891575A (en) * | 2016-06-14 | 2016-08-24 | 广东电网有限责任公司电力科学研究院 | Voltage divider |
| CN106468729A (en) * | 2015-08-20 | 2017-03-01 | 中国电力科学研究院 | A kind of divider with radiator structure |
| CN109300676A (en) * | 2018-10-17 | 2019-02-01 | 全球能源互联网研究院有限公司 | A kind of wideband voltage transformer |
| CN109557354A (en) * | 2018-10-17 | 2019-04-02 | 全球能源互联网研究院有限公司 | A kind of wideband voltage transformer containing capacitance-resistance mixed connection topology unit |
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| CN203798883U (en) * | 2014-04-08 | 2014-08-27 | 武汉国测恒通智能仪器有限公司 | Micro-current high-precision resistor type voltage dividing device |
| CN204116436U (en) * | 2014-09-30 | 2015-01-21 | 中国西电电气股份有限公司 | A kind of extra-high voltage direct-current measurement mechanism with two sleeve radiating element |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106468729A (en) * | 2015-08-20 | 2017-03-01 | 中国电力科学研究院 | A kind of divider with radiator structure |
| CN105092927A (en) * | 2015-09-11 | 2015-11-25 | 广东电网有限责任公司电力科学研究院 | Self-calibration high precision AC-DC voltage divider |
| CN105092927B (en) * | 2015-09-11 | 2018-07-03 | 广东电网有限责任公司电力科学研究院 | A kind of self-calibration high-precision alternating current-direct current divider |
| CN105891575A (en) * | 2016-06-14 | 2016-08-24 | 广东电网有限责任公司电力科学研究院 | Voltage divider |
| CN109300676A (en) * | 2018-10-17 | 2019-02-01 | 全球能源互联网研究院有限公司 | A kind of wideband voltage transformer |
| CN109557354A (en) * | 2018-10-17 | 2019-04-02 | 全球能源互联网研究院有限公司 | A kind of wideband voltage transformer containing capacitance-resistance mixed connection topology unit |
| CN109557354B (en) * | 2018-10-17 | 2023-11-07 | 全球能源互联网研究院有限公司 | Broadband voltage transformer containing resistance-capacitance series-parallel topological unit |
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Inventor after: Zhao Xiaolong Inventor after: Ke Jiaru Inventor after: Ke Gaochao Inventor after: Feng Jianhua Inventor after: Ren Wenzhu Inventor after: Lin Guoying Inventor after: Pan Feng Inventor after: Zhang Dingqu Inventor after: Lei Peng Inventor before: Zhao Xiaolong Inventor before: Ke Jiaru Inventor before: Ke Gaochao Inventor before: Feng Jianhua Inventor before: Ren Wenzhu Inventor before: Lin Guoying Inventor before: Pan Feng Inventor before: Zhang Dingqu Inventor before: Lei Peng |
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