CN201408242Y - Device for measuring partial discharge - Google Patents
Device for measuring partial discharge Download PDFInfo
- Publication number
- CN201408242Y CN201408242Y CN2009200694676U CN200920069467U CN201408242Y CN 201408242 Y CN201408242 Y CN 201408242Y CN 2009200694676 U CN2009200694676 U CN 2009200694676U CN 200920069467 U CN200920069467 U CN 200920069467U CN 201408242 Y CN201408242 Y CN 201408242Y
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- CN
- China
- Prior art keywords
- major loop
- shelf depreciation
- low
- shell
- pass filter
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- Expired - Lifetime
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Abstract
The utility model relates to a device for measuring partial discharge; wherein a control measuring cabinet is respectively connected with a low voltage main circuit and a high voltage main circuit. The device is characterized in that a main circuit low pass filter is serially connected in the low voltage main circuit, a low pass filter for a partial discharge machine is provided in the control measuring cabinet and is connected with the partial discharge machine, the output end of one path of an isolation transformer is directly connected with the control measuring cabinet and the output end of the other path is connected with the partial discharge machine in a control power cabinet via the low pass filter of the partial discharge machine, the working earth ends of the low voltage main circuit and the high voltage main circuit are connected with the shells thereof, the shell of the low voltage main circuit, the shell of the high voltage main circuit, the shell of the isolation transformer and the shell of the control measuring cabinet are connected with a fixed grounding point on the shell of a coupling capacitor, and the fixed grounding point on the shell of the coupling capacitoris serially connected with a fixed grounding point and an underground grounding device. The device can reduce the level of background noise in the partial discharge measurement to 1.0pC at least.
Description
Technical field
The utility model relates to a kind of local measurement discharge measuring device, is used to measure local discharge signal, belongs to measure local discharging signal device technical field.
Background technology
In order to determine that whether high-tension switch gear inside exists the harm of the position of shelf depreciation, discharge, assessment shelf depreciation and the defective of elimination discharge etc., needs accurately to measure local discharge signal.Because the apparent discharge capacity is littler than actual discharge amount, signal is very small and weak, and frequency spectrum is very wide again, often runs into external interference ratio measured signal and also want big when measuring, and the interference protection measure of test macro becomes a critical technical problems.Under the environmental baseline of factory manufacturing shop, because the ground unrest source is complicated, interference strength is big, it is poor to get rid of effects of jamming, it is very big to adopt electrical measuring method accurately to measure the shelf depreciation difficulty at present, even can't measure.But, up to the present also do not have the strong partial-discharge measuring device of a kind of antijamming capability.
Summary of the invention
The purpose of this utility model provides the strong partial-discharge measuring device of a kind of antijamming capability.
The technical solution of the utility model has provided a kind of device of measuring shelf depreciation in order to achieve the above object, comprise the low pressure major loop, high pressure major loop and control survey cabinet, it is characterized in that, in the low pressure major loop, be in series with low-pass filter, in the control survey cabinet, be provided with shelf depreciation instrument low-pass filter, the shelf depreciation instrument connects shelf depreciation instrument in the control survey cabinet with low-pass filter, the low pressure major loop all is connected with power supply by isolating transformer with the control survey cabinet, one road output terminal of the isolating transformer that the control survey cabinet is used directly connects the control survey cabinet, another road output terminal connects shelf depreciation instrument in the control survey cabinet by the shelf depreciation instrument with low-pass filter, the shell of equipment is separately received in the working earthing of low pressure major loop and high pressure major loop, the device housings of low pressure major loop, the device housings of high pressure major loop, the shell of the shell of isolating transformer and control survey cabinet connects coupling condenser shell solid ground point, coupling condenser shell solid ground point series connection solid ground point and underground earthing device.
The utility model leaded shielding all link the shell of relevant device, and adopt the mode of an earth point to avoid the ground circuit interference.The power supply that offers low pressure major loop and measurement of partial discharge instrument has all passed through isolating transformer and low-pass filter, isolating transformer make the high frequency interference of coming in from power supply not can by its once and the electric capacity between Secondary Winding directly be sent to Secondary Winding, wave filter filters high frequency interference once more.Suppressed undesired signal so effectively from power supply.
The utility model has the advantages that: the level of the ground unrest that can exist when measuring shelf depreciation is reduced to below the 1.0pC.
Description of drawings
A kind of structured flowchart of measuring the device of shelf depreciation that Fig. 1 provides for the utility model;
Fig. 2 is layout catenation principle figure of the present utility model.
Embodiment
Specify the utility model below in conjunction with embodiment.The double layer screen line of using among the embodiment adopts iron and copper product to make, and three layers of shielding line adopt copper, iron, copper to make respectively.
Embodiment
As shown in Figure 1, a kind of structured flowchart of measuring the device of shelf depreciation that provides for the utility model, comprise the control survey cabinet, the control survey cabinet connects low pressure major loop and high pressure major loop respectively, before the low pressure major loop, be in series with first isolating transformer 23, in the low pressure major loop, be in series with major loop low-pass filter 6, in the control survey cabinet, be provided with shelf depreciation instrument low-pass filter 18, the shelf depreciation instrument that the shelf depreciation instrument connects in the control survey cabinet with low-pass filter 18, one road output terminal of second isolating transformer 17 directly connects the control survey cabinet, another road output terminal connects the shelf depreciation instrument by the shelf depreciation instrument with low-pass filter 18, the shell of equipment is separately received in the working earthing of low pressure major loop and high pressure major loop, the device housings of low pressure major loop, the device housings of high pressure major loop, the shell of first isolating transformer 23, the shell of the shell of second isolating transformer 17 and control survey cabinet connects coupling condenser shell solid ground point 14, with wide copper strips and copper litz wire this earth point is connected to solid ground point 15, solid ground point 15 connects underground earthing device.
As shown in Figure 2, be layout catenation principle figure of the present utility model.The low pressure major loop is made up of single-phase voltage regulating device 4, tranformer protection unit 5, major loop low-pass filter 6 and the compensation reactor 7 in parallel of series connection.Second source line 1 and the 3rd power lead 2 connect the input end of single-phase voltage regulating device 4 earlier again by first isolating transformer 23.The shell of single-phase voltage regulating device 4, tranformer protection unit 5, major loop low-pass filter 6 and compensation reactor 7 connects coupling condenser shell solid ground point 14.Connecting line between single-phase voltage regulating device 4, tranformer protection unit 5, major loop low-pass filter 6 and the compensation reactor 7 adopts the double layer screen line.Be provided with control module 19 in the control survey cabinet, measure and display unit 20, measurement of partial discharge instrument 21, and peak-reading voltmeter 22, control module 19 connects shelf depreciation instrument low-pass filter 18 respectively, measure and display unit 20 and peak-reading voltmeter 22, the input end of second isolating transformer 17 connects first power lead 3 of double layer screen line structure, the output terminal of second isolating transformer 17 is divided into two-way, one the tunnel connects control module 19, another road connects shelf depreciation instrument low-pass filter 18, and the shelf depreciation instrument links to each other with measurement of partial discharge instrument 21 with low-pass filter 18.The high pressure major loop is made up of high-tension transformer 8, capacitive divider high-voltage arm 9, capacitive divider low-voltage arm 10, shelf depreciation coupling condenser 11, Partial Discharge Detection impedance 13.High-tension transformer 8 links to each other with compensation reactor 7, high-tension transformer 8 and capacitive divider high-voltage arm 9 of connecting and 10 parallel connections of capacitive divider low-voltage arm, peak-reading voltmeter 22 inserts between capacitive divider high-voltage arm 9 and the capacitive divider low-voltage arm 10, cross-over connection is connected between capacitive divider high-voltage arm 9 and the measurement of partial discharge instrument 21 shelf depreciation coupling condenser 11 and Partial Discharge Detection impedance 13, the shell of high-tension transformer 8 connect coupling condenser shell solid ground point 14.Test product 12 inserts the high pressure major loop.High-tension transformer 8 is the double layer screen line with the connecting line of low pressure major loop.Line between line between capacitive divider low-voltage arm 10 and the peak-reading voltmeter 23 and Partial Discharge Detection impedance 13 and the measurement of partial discharge instrument 21 is for being three layers of shielding line.Underground earthing device adopts two 25 meters long, 40 millimeters copper rods of vertically imbedding 16 of diameter, with brazing the brass sheet of 1500 * a 100 * 10mm is welded on the copper rod top, two copper rods 16 are connected together, and upwards be connected to two wide copper strips on the solid ground point 15 on ground, overhead 20 centimetres at copper coin top, all grounded partss are not connected with other grounded parts of workshop.
The level of the ground unrest that can exist when measuring shelf depreciation by this embodiment is reduced to below the 1pC.
Claims (10)
1. device of measuring shelf depreciation, comprise the low pressure major loop, high pressure major loop and control survey cabinet, it is characterized in that, before the low pressure major loop, be in series with first isolating transformer (23), in the low pressure major loop, be in series with major loop low-pass filter (6), in the control survey cabinet, be provided with shelf depreciation instrument low-pass filter (18), the shelf depreciation instrument connects the interior shelf depreciation instrument (21) of control survey cabinet with low-pass filter (18), one road output terminal of second isolating transformer (17) directly connects the control survey cabinet, another road output terminal connects the interior shelf depreciation instrument of control survey cabinet by the shelf depreciation instrument with low-pass filter (18), the shell of equipment is separately received in the working earthing of low pressure major loop and high pressure major loop, the device housings of low pressure major loop, the device housings of high pressure major loop, the shell of first isolating transformer (23), the shell of second isolating transformer (17) and the shell of control survey cabinet connect coupling condenser shell solid ground point (14), coupling condenser shell solid ground point (14) series connection solid ground point (15) and underground earthing device.
2. a kind of device of measuring shelf depreciation as claimed in claim 1; it is characterized in that; described low pressure major loop comprises single-phase voltage regulating device (4), tranformer protection unit (5) and the compensation reactor (7) in parallel of series connection; the described major loop low-pass filter (6) of connecting between tranformer protection unit (5) and compensation reactor (7), the shell of single-phase voltage regulating device (4), tranformer protection unit (5), major loop low-pass filter (6) and compensation reactor (7) connects described coupling condenser shell solid ground point (14).
3. a kind of partial-discharge measuring device as claimed in claim 2 is characterized in that, the connecting line between described single-phase voltage regulating device (4), tranformer protection unit (5), major loop low-pass filter (6) and the compensation reactor (7) adopts the double layer screen line.
4. a kind of device of measuring shelf depreciation as claimed in claim 1, it is characterized in that, be provided with control module (19), measurement and display unit (20), measurement of partial discharge instrument (21) and peak-reading voltmeter (22) in the described control survey cabinet, control module (19) connects described shelf depreciation instrument low-pass filter (18), measurement and display unit (20) and peak-reading voltmeter (22) respectively, the input end of described second isolating transformer (17) connects first power lead (3), and one road output terminal of second isolating transformer (17) connects control module (19).
5. a kind of device of measuring shelf depreciation as claimed in claim 4 is characterized in that described first power lead (3) is the double layer screen line.
6. a kind of device of measuring shelf depreciation as claimed in claim 4, it is characterized in that, described high pressure major loop comprises high-tension transformer (8), high-tension transformer (8) connects described low pressure major loop and measurement and display unit (20) respectively, high-tension transformer (8) and capacitive divider high-voltage arm (9) of connecting and capacitive divider low-voltage arm (10) parallel connection, peak-reading voltmeter (22) inserts between capacitive divider high-voltage arm (9) and the capacitive divider low-voltage arm (10), cross-over connection is connected between capacitive divider high-voltage arm (9) and the described measurement of partial discharge instrument (21) shelf depreciation coupling condenser (11) and Partial Discharge Detection impedance (13), the shell of high-tension transformer (8) connects described coupling condenser shell solid ground point (14).
7. a kind of device of measuring shelf depreciation as claimed in claim 6 is characterized in that, described high-tension transformer (8) is the double layer screen line with the connecting line of described low pressure major loop.
8. a kind of device of measuring shelf depreciation as claimed in claim 6 is characterized in that, the line between described capacitive divider low-voltage arm (10) and the described peak-reading voltmeter (22) is three layers of shielding line.
9. a kind of device of measuring shelf depreciation as claimed in claim 6 is characterized in that, the line between described Partial Discharge Detection impedance (13) and the described measurement of partial discharge instrument (21) is three layers of shielding line.
10. a kind of device of measuring shelf depreciation as claimed in claim 1 is characterized in that described underground earthing device is at least two copper rods that connect together (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200694676U CN201408242Y (en) | 2009-03-26 | 2009-03-26 | Device for measuring partial discharge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200694676U CN201408242Y (en) | 2009-03-26 | 2009-03-26 | Device for measuring partial discharge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201408242Y true CN201408242Y (en) | 2010-02-17 |
Family
ID=41679180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200694676U Expired - Lifetime CN201408242Y (en) | 2009-03-26 | 2009-03-26 | Device for measuring partial discharge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201408242Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091524A (en) * | 2012-12-31 | 2013-05-08 | 山东电力集团公司青岛供电公司 | Cable oscillatory wave partial discharge detection system shielding device |
| CN104007378A (en) * | 2014-05-05 | 2014-08-27 | 合容电气股份有限公司 | Testing device and method for damping discharging of series capacitor |
-
2009
- 2009-03-26 CN CN2009200694676U patent/CN201408242Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091524A (en) * | 2012-12-31 | 2013-05-08 | 山东电力集团公司青岛供电公司 | Cable oscillatory wave partial discharge detection system shielding device |
| CN103091524B (en) * | 2012-12-31 | 2016-05-25 | 山东电力集团公司青岛供电公司 | A kind of screening arrangement of cable oscillation wave partial discharge detection system |
| CN104007378A (en) * | 2014-05-05 | 2014-08-27 | 合容电气股份有限公司 | Testing device and method for damping discharging of series capacitor |
| CN104007378B (en) * | 2014-05-05 | 2017-01-18 | 合容电气股份有限公司 | Testing device and method for damping discharging of series capacitor |
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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: 20100217 |
|
| CX01 | Expiry of patent term |