CN209707576U - A kind of residual voltage sensor based on capacitance partial pressure - Google Patents
A kind of residual voltage sensor based on capacitance partial pressure Download PDFInfo
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- CN209707576U CN209707576U CN201821911985.3U CN201821911985U CN209707576U CN 209707576 U CN209707576 U CN 209707576U CN 201821911985 U CN201821911985 U CN 201821911985U CN 209707576 U CN209707576 U CN 209707576U
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Abstract
The utility model discloses a kind of residual voltage sensor based on capacitance partial pressure, high-voltage connection, high-voltage capacitance, full skirt including A, B, C three-phase, low-voltage capacitance, low pressure PCB circuit board, firm banking and secondary shield lead-out wire, the secondary shield lead-out wire is connect with the low-voltage capacitance, and the high-voltage connection of A, B, C three-phase is drawn by high-voltage capacitance respectively, and A, B, C three-phase high-voltage capacitor and full skirt pass through epoxide resin material one moulding by casting.Utility model has the advantages that high-voltage capacitance uses laminated film capacity cell of connecting on pcb board, the big 600~900pF of capacitance, anti-stray capacitance interference performance is strong, and multiple capacity cell partial pressures only have several hectovolts, therefore dielectric strength is high, and partial discharge is small；In parallel with low-voltage capacitance progress by the way that different size of capacity cell is arranged in low pressure PCB circuit board, to realize the compensation to output voltage, precision can reach 0.2 grade.
Description
Technical field
The utility model relates to a kind of residual voltage sensors, and in particular to a kind of residual voltage biography based on capacitance partial pressure
Sensor.
Background technique
Voltage transformer is mainly used for the electrical energy measurement, power quality analysis and safeguard protection of power grid.For three-phase line,
Other than needing to measure the voltage of each phase, it is also necessary to monitor three phase supply voltage degree of unbalancedness and Single Phase Metal ground connection and
The failures such as phase shortage, it is therefore desirable to measure residual voltage.
The basic principle of zero-sequence current protection is based on Kirchhoff's current law (KCL): flowing into the telegram in reply of any node in circuit
The algebraical sum of stream is equal to zero.Under route and the normal situation of electrical equipment, the vector sum of each phase current is equal to zero, therefore, zero
The secondary side winding no signal of sequence current transformer exports, and executive component is failure to actuate.Each phase current upon the occurrence of a ground fault
Vector sum be not zero, fault current makes to generate magnetic flux in the annular core of zero sequence current mutual inductor, zero sequence current mutual inductor
Secondary side induced voltage acts executive component, drives trip gear, switches supply network, reaches the mesh of earth-fault protection
's.
The existing three-phase combination voltage mutual inductor with residual voltage output generallys use three single-phase electricity magnetic-type mutual induction of voltage
What the star-like connection of device and a neutral point were realized by zero sequence electromagnetic potential transformer ground connection.When three phase supply voltage is uneven
When weighing apparatus and the failures such as generation Single Phase Metal ground connection and phase shortage, zero sequence electromagnetic potential transformer secondary side exports zero by a certain percentage
Sequence voltage.
In practice, change because output voltage can change with factors such as temperature, magnetic fields, in high/low temperature, stray electrical
Hold under interference, measurement accuracy cannot ensure in 0.5 grade of error range.
So how to design a kind of residual voltage sensor that measurement accuracy is high, becoming us will currently be solved the problems, such as.
Utility model content
The purpose of this utility model is to provide a kind of residual voltage sensor based on capacitance partial pressure, to solve above-mentioned back
The problem of being proposed in scape technology.
To achieve the above object, the utility model provides the following technical solutions: a kind of residual voltage based on capacitance partial pressure
Sensor, high-voltage connection, high-voltage capacitance, full skirt including A, B, C three-phase, low-voltage capacitance, low pressure PCB circuit board, firm banking
With secondary shield lead-out wire, the secondary shield lead-out wire is connect with the low-voltage capacitance, the high-voltage connection of A, B, C three-phase
It is drawn respectively by high-voltage capacitance, A, B, C three-phase high-voltage capacitor passes through epoxide resin material and full skirt casting one respectively
It is body formed, and fix on the fixed base,
The high-voltage capacitance is made of several laminated film capacitors being connected in PCB circuit board,
The low-voltage capacitance is arranged in the low pressure PCB circuit board,
The low pressure PCB circuit board is arranged in the firm banking,
It is additionally provided with discharge tube in the low pressure PCB circuit board, high pressure compensation capacitance group I, high pressure compensation capacitance group II and low
Compensating capacitance group III is pressed,
The high pressure compensation capacitance group I connects with the A high-voltage capacitance arm, the high pressure compensation capacitance group II and the B
The series connection of high-voltage capacitance arm, the low-voltage compensation capacitance group III are in parallel with the low-voltage capacitance.
Further, the PCB circuit board is two-sided PCB circuit board, and the laminated film capacitor is plugged on the PCB electricity
The upper and lower surface of road plate, and pass through soldering and welding.
Further, the quantity of the laminated film capacitor is 16, and the laminated film capacitance is 600~900pF.
Further, the compensating capacitance group I, compensating capacitance group II, compensating capacitance group III, low-voltage capacitance and discharge tube
And it is connected in output end, and draw by the secondary shield lead-out wire.
Further, the compensating capacitance group I and compensating capacitance group II is in series by 4 capacity cells, the benefit
To repay 4 capacity cells of capacitance group I successively be respectively 0.07% to the compensation of A high-voltage capacitance arm end output voltage,
4 capacity cells of 0.14%, 0.14% and 0.3%, the compensating capacitance group II are successively respectively to the B high-voltage capacitance arm end
The compensation of output voltage is 0.07%, 0.14%, 0.14% and 0.3%.
Further, the compensating capacitance group III is connected in series by 9 capacity cells, and the 9 of the compensating capacitance group III
A capacity cell is respectively successively 4.5%, 4.5%, 1.6%, 1.6% to the compensation of low-voltage capacitance end output voltage,
1%, 0.4%, 0.2%, 0.1% and 0.1%.
The beneficial effects of the utility model are:
High-voltage capacitance uses laminated film capacity cell of connecting on pcb board, and the big 600~900pF of capacitance resists spuious
Capacitance interference ability is strong, and is connected using multiple capacity cells, and each capacity cell partial pressure only has several hectovolts, therefore it is strong to insulate
Degree is high, and partial discharge is small.
It is in parallel with low-voltage capacitance progress by the way that different size of capacity cell is arranged in low pressure PCB circuit board, to realize
Compensation to output voltage, precision can reach 0.2 grade.
Detailed description of the invention
Fig. 1 is the overall structure main view of the utility model；
Fig. 2 is the overall structure bottom view of the utility model；
Fig. 3 is the high-voltage capacitor structure schematic diagram of the utility model；
Fig. 4 is the low pressure PCB circuit board structural schematic diagram of the utility model；
Fig. 5 is the full skirt schematic diagram of internal structure of the utility model；
Wherein: 1- high-voltage connection, 2- firm banking, 3- full skirt, 4- secondary shield lead-out wire, 5- laminated film capacitor, 6-
PCB circuit board, 7- low-voltage capacitance, 8- low pressure PCB circuit board, 9- discharge tube, 10- compensating capacitance group I, 11- compensating capacitance group II,
12- compensating capacitance group III.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Fig. 1-5 is please referred to, the utility model provides a kind of residual voltage sensor based on capacitance partial pressure, including A, B, C
High-voltage connection 1, high-voltage capacitance, the full skirt 3 of three-phase, low-voltage capacitance 7, low pressure PCB circuit board 8, firm banking 2 and secondary shield draw
Outlet 4, the secondary shield lead-out wire 4 are connect with the low-voltage capacitance 7, and the high-voltage connection 1 of A, B, C three-phase is respectively by height
Voltage capacitance is drawn, and A, B, C three-phase high-voltage capacitor passes through epoxide resin material respectively and the full skirt 3 casting is integrally formed,
And be fixed on the firm banking 2,
The high-voltage capacitance is made of several laminated film capacitors 5 for being connected in PCB circuit board 6, the PCB electricity
Road plate 6 is two-sided PCB circuit board, and the laminated film capacitor 5 is plugged on the upper and lower surface of the PCB circuit board, and passes through tin
Weldering welding.
The quantity of the laminated film capacitor 5 is 16, and 5 capacitance of laminated film capacitor is 600~900pF.
The low-voltage capacitance 7 is arranged in the low pressure PCB circuit board 8,
The low pressure PCB circuit board 8 is arranged in the firm banking 2,
Discharge tube 9, high pressure compensation capacitance group I10, high pressure compensation capacitance group II11 are additionally provided in the low pressure PCB circuit board
With low-voltage compensation capacitance group III12,
The high pressure compensation capacitance group I10 connects with the A high-voltage capacitance arm, the high pressure compensation capacitance group II11 and institute
The series connection of B high-voltage capacitance arm is stated, the low-voltage compensation capacitance group III 12 is in parallel with the low-voltage capacitance 7.
The compensating capacitance group I10, compensating capacitance group II11, compensating capacitance group III12, low-voltage capacitance 7 and discharge tube 9 are simultaneously
It is connected in output end, and is drawn by the secondary shield lead-out wire 4.
The compensating capacitance group I10 and compensating capacitance group II11 is in series by 4 capacity cells, the compensating electric capacity
Group I10 and compensating capacitance group II11 is in series by 4 capacity cells, 4 capacity cells of the compensating capacitance group I10 according to
Secondary is respectively 0.07%, 0.14%, 0.14% and 0.3% to the compensation of A high-voltage capacitance arm end output voltage, the compensation
4 capacity cells of capacitance group II11 successively respectively to the compensation of B high-voltage capacitance arm end output voltage be 0.07%,
0.14%, 0.14% and 0.3%.
The compensating capacitance group III12 is connected in series by 9 capacity cells, 9 capacitors of the compensating capacitance group III12
Element is respectively successively 4.5%, 4.5%, 1.6%, 1.6%, 1% to the compensation of low-voltage capacitance end output voltage,
0.4%, 0.2%, 0.1% and 0.1%.
The beneficial effects of the utility model are: high-voltage capacitance uses laminated film capacity cell of connecting on pcb board, capacitor
Big 600~900pF is measured, anti-stray capacitance interference performance is strong, and connects using multiple capacity cells, each capacity cell partial pressure
Only several hectovolts, therefore dielectric strength is high, partial discharge is small.
It is in parallel with low-voltage capacitance progress by the way that different size of capacity cell is arranged in low pressure PCB circuit board, to realize
Compensation to output voltage, precision can reach 0.2 grade.
While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art,
It is understood that these embodiments can be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaired
Change, replacement and variant, the scope of the utility model is defined by the appended claims and the equivalents thereof.
Claims (6)
1. a kind of residual voltage sensor based on capacitance partial pressure, it is characterised in that: high-voltage connection, height including A, B, C three-phase
Voltage capacitance, full skirt, low-voltage capacitance, low pressure PCB circuit board, firm banking and secondary shield lead-out wire, the secondary shield are drawn
Line is connect with the low-voltage capacitance, and the high-voltage connection of A, B, C three-phase is drawn by high-voltage capacitance respectively, A, B, C three-phase
High-voltage capacitance passes through epoxide resin material respectively and full skirt casting is integrally formed, and fixes on the fixed base,
The high-voltage capacitance is made of several laminated film capacitors being connected in PCB circuit board,
The low-voltage capacitance is arranged in the low pressure PCB circuit board,
The low pressure PCB circuit board is arranged in the firm banking,
Discharge tube is additionally provided in the low pressure PCB circuit board, high pressure compensation capacitance group work, high pressure compensation capacitance group II and low pressure are mended
Capacitance group III is repaid,
The high pressure compensation capacitance group I connects with the high-voltage capacitance arm of A phase, the high pressure of the high pressure compensation capacitance group II and B phase
The series connection of capacitor arm, the low-voltage compensation capacitance group III are in parallel with the low-voltage capacitance.
2. a kind of residual voltage sensor based on capacitance partial pressure according to claim 1, it is characterised in that: the PCB
Circuit board is two-sided PCB circuit board, and the laminated film capacitor is plugged on the upper and lower surface of the PCB circuit board, and passes through tin
Weldering welding.
3. a kind of residual voltage sensor based on capacitance partial pressure according to claim 2, it is characterised in that: described compound
The quantity of thin-film capacitor is 16, and the laminated film capacitance is 600~900pF.
4. a kind of residual voltage sensor based on capacitance partial pressure according to claim 1, it is characterised in that: the compensation
Capacitance group I, compensating capacitance group II, compensating capacitance group III, low-voltage capacitance and discharge tube are simultaneously connected in output end, and by described
Secondary shield lead-out wire is drawn.
5. a kind of residual voltage sensor based on capacitance partial pressure according to claim 1, it is characterised in that: the compensation
Capacitance group I and compensating capacitance group II are in series by 4 capacity cells, and 4 capacity cells of the compensating capacitance group I are successively
It is respectively 0.07%, 0.14%, 0.14% and 0.3% to the compensation of the high-voltage capacitance arm end output voltage of A phase, the compensation electricity
4 capacity cells of appearance group II are respectively successively 0.07%, 0.14% to the compensation of the high-voltage capacitance arm end output voltage of B phase,
0.14% and 0.3%.
6. a kind of residual voltage sensor based on capacitance partial pressure according to claim 1, it is characterised in that: the compensation
Capacitance group III is connected in series by 9 capacity cells, and 9 capacity cells of the compensating capacitance group III are successively respectively to described low
The compensation of voltage capacitance end output voltage is 4.5%, 4.5%, 1.6%, 1.6%, 1%, 0.4%, 0.2%, 0.1% and 0.1%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821911985.3U CN209707576U (en) | 2018-11-20 | 2018-11-20 | A kind of residual voltage sensor based on capacitance partial pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821911985.3U CN209707576U (en) | 2018-11-20 | 2018-11-20 | A kind of residual voltage sensor based on capacitance partial pressure |
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| CN209707576U true CN209707576U (en) | 2019-11-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109254190A (en) * | 2018-11-20 | 2019-01-22 | 江苏思源赫兹互感器有限公司 | A kind of residual voltage sensor based on capacitance partial pressure |
| WO2024124669A1 (en) * | 2022-12-12 | 2024-06-20 | 江苏靖江互感器股份有限公司 | Lc compatible voltage sensor |
-
2018
- 2018-11-20 CN CN201821911985.3U patent/CN209707576U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109254190A (en) * | 2018-11-20 | 2019-01-22 | 江苏思源赫兹互感器有限公司 | A kind of residual voltage sensor based on capacitance partial pressure |
| WO2024124669A1 (en) * | 2022-12-12 | 2024-06-20 | 江苏靖江互感器股份有限公司 | Lc compatible voltage sensor |
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