CN202502124U - DAC voltage generator used for cable partial discharge detection - Google Patents
DAC voltage generator used for cable partial discharge detection Download PDFInfo
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- CN202502124U CN202502124U CN2012201073400U CN201220107340U CN202502124U CN 202502124 U CN202502124 U CN 202502124U CN 2012201073400 U CN2012201073400 U CN 2012201073400U CN 201220107340 U CN201220107340 U CN 201220107340U CN 202502124 U CN202502124 U CN 202502124U
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- rectification circuit
- resistance
- transformer
- partial discharge
- coupling unit
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Abstract
The utility model relates to a DAC voltage generator used for cable partial discharge detection. The DAC voltage generator comprises a rectification circuit, an inductor, a laser triggered field effect tube, a high voltage divider, a first resistor, a transformer, a partial discharge coupling unit and a data processing unit. An output end of the transformer is connected with the rectification circuit; the rectification circuit, the first resistor, the inductor, the high voltage divider and the partial discharge coupling unit are connected successively; one end of the laser trigged field effect tube is connected between the first resistor and the inductor, and the other end is grounded; and the data processing unit is respectively connected with the transformer, the laser triggered field effect tube and the partial discharge coupling unit. Compared with the prior art, the DAC voltage generator of the utility model has the advantages of strong anti-interference capability, small error, high sensitivity and the like.
Description
Technical field
The utility model relates to a kind of electric system device, especially relates to a kind of DAC voltage generation circuit that cable local discharge detects that is used for.
Background technology
The discharge that the power equipment insulation takes place in the subrange under enough strong electric field action.This discharge does not form conductive channel only to cause insulation local short (road and bridge) between conductor and connect and exceeds.Shelf depreciation all can have some influences to insulating medium each time, and slight shelf depreciation is less to the influence of power equipment insulation, and the decline of dielectric strength is slower; And strong shelf depreciation then can make dielectric strength descend very soon.This is a key factor that makes the high voltage electric power equip ment insulation damages.Therefore, during the insulation of design high voltage electric power equip ment, consider under the effect of long-term work voltage, not allow to take place in the insulation system stronger shelf depreciation.
Mainly contain ultrahigh frequency detection method, ultrasonic Detection Method and pulse current method at present.Wherein, when ultrahigh frequency detection method, ultrasonic Detection Method are used in actual field, receive easily to disturb, quantitative error is bigger; The insufficient sensitivity of pulse current method is high.
The utility model content
The purpose of the utility model is exactly for the defective that overcomes above-mentioned prior art existence the DAC voltage generation circuit that cable local discharge detects that is used for that a kind of antijamming capability is strong, error is little, highly sensitive to be provided.
The purpose of the utility model can realize through following technical scheme:
A kind of DAC voltage generation circuit that is used for the cable local discharge detection is characterized in that, comprises that rectification circuit, inductance, laser trigger FET, high-voltage bleeder, first resistance, transformer, shelf depreciation coupling unit and data processing unit;
Described transformer output terminal is connected with rectification circuit; Described rectification circuit, first resistance, inductance, high-voltage bleeder, shelf depreciation coupling unit connect successively; Described laser triggers FET one and terminates between first resistance, the inductance; Other end ground connection, described data processing unit are triggered FET with transformer, laser respectively, the shelf depreciation coupling unit is connected.
Described rectification circuit is the half-bridge rectification circuit.
Described high-voltage bleeder comprises two second resistance and two electric capacity, and described two second resistance, two electric capacity carry out parallel connection after connecting respectively, are connected through lead between two second resistance with between two electric capacity.
Compared with prior art, the utility model antijamming capability is strong, error is little, highly sensitive.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Among the figure: the 1-rectification circuit, the 2-transformer, 3-first resistance, the 4-inductance, the 5-high-voltage bleeder, the 6-data processing unit, 7-laser triggers FET, 8-shelf depreciation coupling unit.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is elaborated.
Embodiment
As shown in Figure 1; A kind ofly be used for the DAC voltage generation circuit that cable local discharge detects, comprise that rectification circuit 1, inductance 4, laser trigger FET 7, high-voltage bleeder 5, first resistance 3, transformer 2, shelf depreciation coupling unit 8 and data processing unit 6; Described transformer 2 output terminals are connected with rectification circuit 1; Described rectification circuit 1, first resistance 3, inductance 4, high-voltage bleeder 5, shelf depreciation coupling unit 8 connect successively; Described laser triggers FET 7 one and terminates between first resistance 3, the inductance 4; Other end ground connection, described data processing unit 6 are triggered FET 7 with transformer 2, laser respectively, shelf depreciation coupling unit 8 is connected.Described rectification circuit 1 is the half-bridge rectification circuit.Described high-voltage bleeder 5 comprises two second resistance and two electric capacity, and described two second resistance, two electric capacity carry out parallel connection after connecting respectively, are connected through lead between two second resistance with between two electric capacity.
DAC voltage is a kind of alternating voltage of amplitude oscillatory extinction, and frequency range is between 20Hz～300Hz.The generation of DAC voltage is based on the L-C resonance principle.The shelf depreciation location technology adopts time domain reflectometry (TDR method) under the DAC voltage; The frequency domain scope is 150kHz～45MHz; The partial discharge quantity measurement meets in the IEC60270 standard calibration and Testing requirement under the DAC voltage; Adopt pulse current method (ERA method), mainly utilize in the shelf depreciation frequency spectrum than the low-frequency range part, general tens of kHz are to hundreds of kHz.Because under the not charged situation of cable, will adopt the pulse of known charge amount to inject correction quantitatively before measuring, thereby can obtain the shelf depreciation numerical quantity of quantification, be unit with pC.
Claims (3)
1. one kind is used for the DAC voltage generation circuit that cable local discharge detects, and it is characterized in that, comprises that rectification circuit, inductance, laser trigger FET, high-voltage bleeder, first resistance, transformer, shelf depreciation coupling unit and data processing unit;
Described transformer output terminal is connected with rectification circuit; Described rectification circuit, first resistance, inductance, high-voltage bleeder, shelf depreciation coupling unit connect successively; Described laser triggers FET one and terminates between first resistance, the inductance; Other end ground connection, described data processing unit are triggered FET with transformer, laser respectively, the shelf depreciation coupling unit is connected.
2. a kind of DAC voltage generation circuit that cable local discharge detects that is used for according to claim 1 is characterized in that described rectification circuit is the half-bridge rectification circuit.
3. a kind of DAC voltage generation circuit that cable local discharge detects that is used for according to claim 1; It is characterized in that; Described high-voltage bleeder comprises two second resistance and two electric capacity; Described two second resistance, two electric capacity carry out parallel connection after connecting respectively, are connected through lead between two second resistance with between two electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201073400U CN202502124U (en) | 2012-03-20 | 2012-03-20 | DAC voltage generator used for cable partial discharge detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201073400U CN202502124U (en) | 2012-03-20 | 2012-03-20 | DAC voltage generator used for cable partial discharge detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202502124U true CN202502124U (en) | 2012-10-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201073400U Expired - Lifetime CN202502124U (en) | 2012-03-20 | 2012-03-20 | DAC voltage generator used for cable partial discharge detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202502124U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914733A (en) * | 2012-11-16 | 2013-02-06 | 中国电力科学研究院 | In-situ detecting method for partial discharge of damped oscillation wave of large-length ultrahigh voltage crosslinked cable |
-
2012
- 2012-03-20 CN CN2012201073400U patent/CN202502124U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914733A (en) * | 2012-11-16 | 2013-02-06 | 中国电力科学研究院 | In-situ detecting method for partial discharge of damped oscillation wave of large-length ultrahigh voltage crosslinked cable |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121024 |
|
| CX01 | Expiry of patent term |