CN104714069A - Novel capacitive voltage-division voltage transducer - Google Patents
Novel capacitive voltage-division voltage transducer Download PDFInfo
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- CN104714069A CN104714069A CN201310676428.3A CN201310676428A CN104714069A CN 104714069 A CN104714069 A CN 104714069A CN 201310676428 A CN201310676428 A CN 201310676428A CN 104714069 A CN104714069 A CN 104714069A
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Abstract
The invention discloses a novel capacitive voltage-division voltage transducer which comprises an electrode, a high-voltage component, a voltage divider, a shielded wire, and a casting body. The capacitive voltage-division voltage transducer has a simple structure, and is convenient to install; the key components, namely, the voltage divider and the high-voltage component, are filed with a dielectric medium with favorable temperature characteristic and favorable voltage coefficient, the influence of temperature and electromagnetic interference on errors can be well overcome, and the accuracy of secondary output of products reaches the level of 0.2.
Description
Technical field
The present invention relates to a kind of voltage sensor of novel capacitor partial pressure type, in the high-voltage fence of electric system, its function is transformed to low-voltage by pro rata for the high voltage of primary system, and supply surveying instrument and protective device use.
Background technology
In nineteen sixties, western countries that some science and technology are flourishing have begun one's study voltage sensor, have arrived the eighties not just hanging net operation.The domestic research and development to voltage sensor are started late, it is electric resistance partial pressure that the sensing unit of current voltage sensor uses more, adopt electric resistance partial pressure the critical component of voltage sensor be high-tension resistive, high-tension resistive easily produces a large amount of heats at long-play to be difficult to distribute, its reliability is greatly reduced, starting material again because making high-tension resistive are subject to the impact of temperature variation and change in voltage clearly, and the secondary of product exports unstable, and precision is difficult to realize 0.2 grade.In addition voltage sensor also has employing invar alloy to make capacitive divider, this material of invar alloy has excellent temperature characterisitic, its physical property is hardly by the impact of temperature, but this material price is somewhat expensive, invar alloy is all seldom adopted to make the voltage sensor of voltage divider both at home and abroad.The development of current making voltage sensor mainly product, easily by the impact of temperature, is difficult to realize high precision secondary and exports.
Summary of the invention
The present invention solves the impact that temperature produces voltage sensor secondary output error, provides a kind of structure simple, easy for installation, can long time continuous working, electric pressure 10kV, the voltage sensor that precision is 0.2 grade.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
A kind of voltage sensor of novel capacitor partial pressure type, primarily of electrode, high voltage component, the interior electrode of two high voltage components, voltage divider, the interior electrode of two voltage dividers, shielding line and pour mass composition, described voltage sensor is used to measuring voltage U's, comprise a voltage sampling electrode, at least one high voltage component, a voltage divider and an electromagnetic-field-shielded assembly, described voltage sensor is applied between an electrode of high voltage component and an electrode of voltage divider by electrode to carry out measuring voltage U, and set up an intrinsic standoff ratio k by the electric capacity of high voltage component and voltage divider.
The described voltage ratio k be applied between voltage divider and high voltage component is a constant, and its value gets k=1: 10000.
The interior electrode of described two high voltage components is spaced from each other placement, and is filled with the dielectric that specific inductive capacity is 5 ~ 100 between two electrodes, and described dielectric temperature coefficient is 0 ~ ± 30ppm, dielectric loss angle tangent value≤5 × 10
-4.
The circle of described electrode shape to be Radius be R, makes the mixed electronic material that material is silver and palladium.
The dielectric placed between the interior electrode of described two high voltage components has thickness δ, and thickness δ selects according to the use electric pressure of voltage sensor.
Described voltage divider has the temperature coefficient identical with high voltage component and identical variation tendency.
It is a magnitude of voltage u that the secondary of described voltage sensor exports, and u=k × U, for making secondary output voltage not by the interference in external high frequency magnetic field, be a metal screen layer at the skin of high voltage component, and metal screen layer can not contact with high voltage component, metal screen layer is connected with the screen layer of secondary singal transmission line.
When the voltage sensor of a kind of capacitance-voltage-distributing type of the present invention works, primary voltage is added on electrode, and voltage divider is converted to low-voltage signal pro rata for primary voltage, by transmission system supply surveying instrument and the protective device use of secondary singal.
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure: 1-electrode; The interior electrode of 2-high voltage component; 3-high voltage component; The interior electrode of 4-high voltage component; The interior electrode of 5-voltage divider; 6-voltage divider; The interior electrode of 7-voltage divider.
Embodiment
As shown in Figure 1, the voltage sensor of a kind of novel capacitor partial pressure type of the present invention is made up of electrode 1, high voltage component 3, voltage divider 6, metallic shield assembly and secondary singal transmission line.Wherein the interior electrode 2 and 4 of high voltage component 3 isolates placement mutually, is filled with the dielectric that specific inductive capacity is 5 ~ 100 between two electrodes.
Described dielectric is the compound of several metal oxide, and the proportioning of its oxide directly affects dielectric stability and withstand voltage and shelf depreciation.
Described dielectric temperature coefficient is 0 ~ ± 30ppm, dielectric loss angle tangent≤5 × 10
-4, dielectric has good temperature characterisitic and aging characteristics, to ensure that the secondary stable output of temperature product in the variation range of-25 ~ 40 DEG C is at 0.2 grade, and the operation that can be energized for a long time.
In described high voltage component, electrode 2 and 4 silver palladium alloy makes, and wherein the content of palladium is 3%, makes it have good adhesion and weldability.
Described voltage divider 6 has the structure identical with high voltage component 3, and the dielectric that its dielectric and high voltage component 3 use is commaterial, and method for making is identical.
Described voltage divider 6 preferably controls its capacitance, makes it be 10000: 1 with the ratio of the electric capacity of high voltage component 3.
Directly be fixed on electrode 1 by installation screw when described high voltage component 3 is installed, one of them electrode 5 of voltage divider 6 welds with another electrode 4 of high voltage component 3, secondary singal is exported by the two ends of voltage divider 6, and Signal transmissions adopts the array mode of shielding line and aviation plug to export.
Described each parts use poured with epoxy resin after installing and fixing.
The present invention is by providing a kind of structure simple with upper type, precision is the voltage sensor of 0.2 grade, can meet the request for utilization of power system measuring and relay protection.
Claims (7)
1. the voltage sensor of a novel capacitor partial pressure type, primarily of electrode, high voltage component, the interior electrode of two high voltage components, voltage divider, the interior electrode of two voltage dividers, shielding line and pour mass composition, it is characterized in that: described voltage sensor is used to measuring voltage U's, comprise a voltage sampling electrode, at least one high voltage component, a voltage divider and an electromagnetic-field-shielded assembly, described voltage sensor is applied between an electrode of high voltage component and an electrode of voltage divider by electrode to carry out measuring voltage U, and set up an intrinsic standoff ratio k by the electric capacity of high voltage component and voltage divider.
2. the voltage sensor of a kind of novel capacitor partial pressure type according to claim 1, is characterized in that: described in the voltage ratio k be applied between voltage divider and high voltage component be a constant, its value gets k=1: 10000.
3. the voltage sensor of a kind of novel capacitor partial pressure type according to claim 1, it is characterized in that: the interior electrode of described two high voltage components is spaced from each other placement, and be filled with the dielectric that specific inductive capacity is 5 ~ 100 between two electrodes, described dielectric temperature coefficient is 0 ~ ± 30ppm, dielectric loss angle tangent value≤5 × 10
-4.
4. the voltage sensor of a kind of novel capacitor partial pressure type according to claim 3, is characterized in that: the circle of described electrode shape to be Radius be R, makes the mixed electronic material that material is silver and palladium.
5. the voltage sensor of a kind of novel capacitor partial pressure type according to claim 1 or 3, is characterized in that: the dielectric placed between the interior electrode of described two high voltage components has thickness δ, and thickness δ selects according to the use electric pressure of voltage sensor.
6. the voltage sensor of a kind of novel capacitor partial pressure type according to claim 1, is characterized in that: described voltage divider has the temperature coefficient identical with high voltage component and identical variation tendency.
7. the voltage sensor of a kind of novel capacitor partial pressure type according to claim 1, it is characterized in that: it is a magnitude of voltage u that the secondary of described voltage sensor exports, and u=k × U, for making secondary output voltage not by the interference in external high frequency magnetic field, be a metal screen layer at the skin of high voltage component, and metal screen layer can not contact with high voltage component, metal screen layer is connected with the screen layer of secondary singal transmission line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310676428.3A CN104714069A (en) | 2013-12-13 | 2013-12-13 | Novel capacitive voltage-division voltage transducer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310676428.3A CN104714069A (en) | 2013-12-13 | 2013-12-13 | Novel capacitive voltage-division voltage transducer |
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| CN104714069A true CN104714069A (en) | 2015-06-17 |
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| CN201310676428.3A Pending CN104714069A (en) | 2013-12-13 | 2013-12-13 | Novel capacitive voltage-division voltage transducer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116211A (en) * | 2015-08-27 | 2015-12-02 | 珠海许继电气有限公司 | Suspension type phase voltage measurement device |
| CN105548659A (en) * | 2016-01-21 | 2016-05-04 | 上海固缘电力科技有限公司 | Novel AC high-voltage sensor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053190A (en) * | 2009-10-27 | 2011-05-11 | 广东四会互感器厂有限公司 | Novel capacitance voltage-division type voltage transducer |
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2013
- 2013-12-13 CN CN201310676428.3A patent/CN104714069A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053190A (en) * | 2009-10-27 | 2011-05-11 | 广东四会互感器厂有限公司 | Novel capacitance voltage-division type voltage transducer |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116211A (en) * | 2015-08-27 | 2015-12-02 | 珠海许继电气有限公司 | Suspension type phase voltage measurement device |
| CN105116211B (en) * | 2015-08-27 | 2018-03-16 | 珠海许继电气有限公司 | A kind of floating type phase voltage measurement apparatus |
| CN105548659A (en) * | 2016-01-21 | 2016-05-04 | 上海固缘电力科技有限公司 | Novel AC high-voltage sensor |
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Application publication date: 20150617 |