CN202502199U - Cable ultrahigh frequency partial discharge detection apparatus - Google Patents
Cable ultrahigh frequency partial discharge detection apparatus Download PDFInfo
- Publication number
- CN202502199U CN202502199U CN2012201119724U CN201220111972U CN202502199U CN 202502199 U CN202502199 U CN 202502199U CN 2012201119724 U CN2012201119724 U CN 2012201119724U CN 201220111972 U CN201220111972 U CN 201220111972U CN 202502199 U CN202502199 U CN 202502199U
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- Prior art keywords
- cable
- capacitive transducer
- partial discharge
- capacitance sensor
- discharge detection
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Abstract
The utility model relates to a cable ultrahigh frequency partial discharge detection apparatus that is connected with the cable. The detection apparatus comprises a partial discharge-free test transformer, water resistors, a first capacitance sensor, a second capacitance sensor, a pin electrode, a high-frequency amplifier, a digital oscilloscope and a PC machine. The water resistors are arranged at two ends of the cable; the first capacitance sensor and the second capacitance sensor are arranged on the cable; the output terminal of the partial discharge-free test transformer is respectively connected with the water resistors, the first capacitance sensor, and the pin electrode; the second capacitance sensor, the high-frequency amplifier, the digital oscilloscope and the PC machine are successively connected. Compared with the prior art, the technology employed in the utility model enables the ultrahigh frequency partial discharge detection apparatus to have advantages of high real-time performance and high reliability of monitoring as well as low maintenance cost and the like.
Description
Technical field
The utility model relates to a kind of monitoring device of power domain, especially relates to a kind of cable superfrequency local discharge detection device.
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.
Partial-discharge ultrahigh-frequency on-line monitoring system of the prior art; Normally receive the ultrahigh-frequency signal of local discharge generation through the superfrequency sensor; The signal of by signal receiver the superfrequency sensor being exported again carries out processing such as filtering, amplification, extraction discharge signal peak value and phase place; And data are sent to industrial computer through high-speed data acquisition card, finally utilize LAN or wireless network data transmission technology to realize on-line monitoring to shelf depreciation at user terminal.Its weak point is that the real-time and the reliability of monitoring is not high, and maintenance cost is high.
The utility model content
The purpose of the utility model is exactly to provide a kind of real-time of monitoring and reliability low for the defective that overcomes above-mentioned prior art existence, the cable superfrequency local discharge detection device that maintenance cost is low.
The purpose of the utility model can realize through following technical scheme:
A kind of cable superfrequency local discharge detection device; This pick-up unit is connected with cable; It is characterized in that; Described pick-up unit comprises partial discharge-free test transformer, water resistance, first capacitive transducer, second capacitive transducer, pin electrode, radio-frequency amplifier, digital oscilloscope and PC, and described water resistance is located at the cable two ends, and described first capacitive transducer, second capacitive transducer all are located on the cable; The output terminal of described partial discharge-free test transformer is connected with water resistance, first capacitive transducer, pin electrode respectively, and described second capacitive transducer, radio-frequency amplifier, digital oscilloscope, PC connect successively.
Also comprise protective resistance, this protective resistance is located between partial discharge-free test transformer and the water resistance.
Also comprise protector, this protector is located between second capacitive transducer and the radio-frequency amplifier.
Described first capacitive transducer, second capacitive transducer are the high frequency capacitance sensor.
Compared with prior art, the real-time and the reliability of the utility model monitoring are low, and maintenance cost is low.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is elaborated.
As shown in Figure 1; A kind of cable superfrequency local discharge detection device; This pick-up unit is connected described pick-up unit and comprises partial discharge-free test transformer T, water resistance WT, the first capacitive transducer C1, the second capacitive transducer C2, pin electrode N, radio-frequency amplifier A, digital oscilloscope SC, PC, protective resistance R and protector P1 with cable; Described water resistance WT is located at the cable two ends; The described first capacitive transducer C1, the second capacitive transducer C2 all are located on the cable; The output terminal of described partial discharge-free test transformer T is connected with water resistance WT, the first capacitive transducer C1, pin electrode N respectively, and the described second capacitive transducer C2, radio-frequency amplifier A, digital oscilloscope SC, PC connect successively.Protective resistance R is located between partial discharge-free test transformer T and the water resistance WT.Protector P1 is located between the second capacitive transducer C2 and the radio-frequency amplifier A.
The described first capacitive transducer C1, the second capacitive transducer C2 are the high frequency capacitance sensor.Partial discharge-free test transformer T provide power frequency high voltage to whole measuring system.Protective resistance R plays current limliting and the effect of resistance high frequency, is mainly used in and eliminates on high-tension side high frequency interference.Water resistance WT is used to prevent the cable termination discharge.
Pin electrode N is as Partial Discharge Sources.Protector has P
1Measurement loop in order to the protection back.The frequency of radio-frequency amplifier A is 10MHz～500MHz.Digital oscilloscope SC (TDS 3052, sampling rate 5GS/s), it links to each other through the GPIB card with PC, can realize mutual UNICOM.
Claims (4)
1. cable superfrequency local discharge detection device; This pick-up unit is connected with cable; It is characterized in that; Described pick-up unit comprises partial discharge-free test transformer, water resistance, first capacitive transducer, second capacitive transducer, pin electrode, radio-frequency amplifier, digital oscilloscope and PC, and described water resistance is located at the cable two ends, and described first capacitive transducer, second capacitive transducer all are located on the cable; The output terminal of described partial discharge-free test transformer is connected with water resistance, first capacitive transducer, pin electrode respectively, and described second capacitive transducer, radio-frequency amplifier, digital oscilloscope, PC connect successively.
2. a kind of cable superfrequency local discharge detection device according to claim 1 is characterized in that also comprise protective resistance, this protective resistance is located between partial discharge-free test transformer and the water resistance.
3. a kind of cable superfrequency local discharge detection device according to claim 1 is characterized in that also comprise protector, this protector is located between second capacitive transducer and the radio-frequency amplifier.
4. a kind of cable superfrequency local discharge detection device according to claim 1 is characterized in that described first capacitive transducer, second capacitive transducer are the high frequency capacitance sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201119724U CN202502199U (en) | 2012-03-22 | 2012-03-22 | Cable ultrahigh frequency partial discharge detection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201119724U CN202502199U (en) | 2012-03-22 | 2012-03-22 | Cable ultrahigh frequency partial discharge detection apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202502199U true CN202502199U (en) | 2012-10-24 |
Family
ID=47038809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201119724U Expired - Lifetime CN202502199U (en) | 2012-03-22 | 2012-03-22 | Cable ultrahigh frequency partial discharge detection apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202502199U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102981106A (en) * | 2012-11-12 | 2013-03-20 | 华北电力大学 | Online inspection method of three-phase cross interconnected electric cable intermediate head partial discharge |
| CN103630803A (en) * | 2013-11-05 | 2014-03-12 | 西安交通大学 | Cable partial discharge live correction method |
-
2012
- 2012-03-22 CN CN2012201119724U patent/CN202502199U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102981106A (en) * | 2012-11-12 | 2013-03-20 | 华北电力大学 | Online inspection method of three-phase cross interconnected electric cable intermediate head partial discharge |
| CN102981106B (en) * | 2012-11-12 | 2015-05-06 | 华北电力大学 | Online inspection method of three-phase cross interconnected electric cable intermediate head partial discharge |
| CN103630803A (en) * | 2013-11-05 | 2014-03-12 | 西安交通大学 | Cable partial discharge live correction method |
| CN103630803B (en) * | 2013-11-05 | 2016-04-27 | 西安交通大学 | A kind of cable partial discharge live correction method |
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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 | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121024 |