CN111521907A - Partial discharge monitoring and fault on-line positioning device - Google Patents
Partial discharge monitoring and fault on-line positioning device Download PDFInfo
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- CN111521907A CN111521907A CN202010256619.4A CN202010256619A CN111521907A CN 111521907 A CN111521907 A CN 111521907A CN 202010256619 A CN202010256619 A CN 202010256619A CN 111521907 A CN111521907 A CN 111521907A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- Locating Faults (AREA)
Abstract
The invention provides a partial discharge monitoring and fault online positioning device. The utility model provides a partial discharge monitoring and online positioner of trouble, wherein, includes sensing unit, voltage detection unit, range switching unit, signal conditioning unit, sampling unit, central processing unit and communication module, the sensing unit with range switching unit connects, range switching unit with signal conditioning unit connects, signal conditioning unit with central processing unit connects, central processing unit with communication module connects, the sensing unit still with voltage detection unit connects, voltage detection unit with range switching unit connects, central processing unit with range switching unit connects, the last GPS unit that is equipped with of sampling unit. The invention can simultaneously carry out the on-line monitoring of partial discharge and the on-line positioning of faults on the power cable, and realizes the integration of the on-line positioning of cable faults and the on-line monitoring of partial discharge.
Description
Technical Field
The invention relates to the technical field of partial discharge monitoring, in particular to a partial discharge monitoring and fault online positioning device.
Background
In recent years, power cables have found a great deal of use in domestic power grids. In order to ensure the operation reliability and the maintenance efficiency of the device, the electric power company successively develops the popularization and application work of two devices, namely the on-line monitoring of the partial discharge of the power cable and the on-line positioning of the fault. By the on-line monitoring of partial discharge, operators can find and remove potential defects of cable operation in advance, so that the potential defects are prevented; through the online location of trouble, the operation personnel can in time confirm the position of fault point, carry out the maintenance rapidly to the quick power supply that resumes.
Comparing and analyzing the working principle and the implementation method of the two monitoring devices can find that the fault current pulse and the partial discharge current pulse which occur on the cable line have similarity in nature, and the monitoring methods are communicated in many aspects. In recent years, the technologies of on-line partial discharge positioning and on-line fault positioning are accepted by the power department, however, two sets of corresponding monitoring devices are respectively installed and implemented in the practice of the power grid, and no device can combine two functions.
Disclosure of Invention
The invention aims to overcome the problem that two sets of devices for partial discharge monitoring and fault online positioning are repeatedly installed in the prior art, and provides a device for partial discharge monitoring and fault online positioning. The invention can simultaneously carry out the on-line monitoring of partial discharge and the on-line positioning of faults on the power cable, and realizes the integration of the on-line positioning of cable faults and the on-line monitoring of partial discharge.
In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a partial discharge monitoring and online positioner of trouble, wherein, includes sensing unit, voltage detection unit, range switching unit, signal conditioning unit, sampling unit, central processing unit and communication module, the sensing unit with range switching unit electricity is connected, range switching unit with signal conditioning unit electricity is connected, signal conditioning unit with central processing unit electricity is connected, central processing unit with communication module electricity is connected, the sensing unit still with voltage detection unit electricity is connected, voltage detection unit with range switching unit electricity is connected, central processing unit with range switching unit electricity is connected, the last GPS unit that is equipped with of sampling unit. In the technical scheme, a sensing unit collects pulse current, a threshold value is preset in a voltage detection unit, the pulse current flows into a range switching unit and the voltage detection unit, the voltage detection unit detects that the pulse current is compared with the set threshold value, if the pulse current is larger than the threshold value, a signal is sent out to trigger the range switching unit to enter a fault large-current monitoring mode, and if the pulse current is smaller than the threshold value, the range switching unit keeps a fault small-current monitoring mode; the signal conditioning unit and the sampling unit are used for collecting and filtering related local discharge pulse current and fault current signals; the central processing unit sends control signals to the range switching unit and the sampling unit, the communication module can transmit data between the two technical schemes, and the sampling unit is provided with a GPS unit for evaluating the position of partial discharge or cable fault.
Further, the sensing unit adopts a pulse current capacitive coupling device. Pulse current capacitive coupling device includes external shield shell, inner electrode, first terminal, second terminal, first electric capacity, second electric capacity and output terminal, the inner electrode runs through the external shield shell, first terminal is located with the second terminal the both ends of inner electrode, the one end of first electric capacity with the inner electrode is connected, the other end of first electric capacity with the second electric capacity is connected, the other end of second electric capacity with the external shield shell is connected, output terminal with first electric capacity and second electric capacity are connected, output terminal is located on the external shield shell. The shielding grounding wire of the cable wire to be tested is connected into the pulse current capacitive coupling device from the first binding post and the second binding post, and when the cable wire generates partial discharge or faults, the pulse current capacitive coupling device receives pulse current generated by coupling.
Further, the output terminal adopts a BNC connector, and the pulse current capacitive coupling device inputs the range switching unit and the voltage detection unit through the BNC connector.
Furthermore, the voltage detection unit comprises a first resistor, a second resistor and a comparator, one end of the first resistor is connected with one end of the second resistor, the other end of the second resistor is grounded, and the comparator is connected with the first resistor and the second resistor. The voltage detection unit can compare the pulse current with a preset threshold value, if the pulse current is larger than the threshold value, the voltage detection unit sends a signal to enable the range switching unit to be switched to a fault large-current monitoring mode, and if the pulse current is not larger than the threshold value, the fault small-current monitoring mode initially set by the range switching unit is kept.
Furthermore, the range switching unit comprises a high-speed electronic switch, an and gate and a third resistor, wherein one end of the third resistor is connected with one end of the high-speed electronic switch, and the other end of the high-speed electronic switch is connected with the and gate. The range switching unit is initially in a fault low-current monitoring mode, and is switched to the fault high-current monitoring mode only when the voltage detection unit sends a signal.
Further, the signal conditioning unit employs a filter.
Furthermore, the sampling unit adopts a data acquisition card.
Further, the central processing unit sends control signals to the sampling unit and the range switching unit. The central processing unit can control the sampling unit and the range switching unit.
Furthermore, the communication module adopts a 4G wireless communication module.
Compared with the prior art, the invention has the beneficial effects that:
by adopting the pulse current capacitive coupling device, the invention can collect information of partial discharge and fault monitoring of the cable and wire; the voltage detection unit is matched with the pulse current capacitive coupling device for use, so that the dynamic measurement range is expanded, and the hardware cost of the device is simplified;
drawings
Fig. 1 is a schematic structural diagram of a partial discharge monitoring and fault online positioning device according to the present invention.
Fig. 2 is a schematic structural diagram of a sensing unit according to the present invention.
FIG. 3 is a circuit diagram of a voltage detecting unit according to the present invention.
Fig. 4 is a circuit diagram of a range switching unit in the present invention.
Fig. 5 is a schematic diagram of positioning calculation according to the second embodiment.
The graphic symbols are illustrated as follows:
the method comprises the following steps of 1-an external shielding shell, 2-an internal electrode, 3-a first wiring terminal, 4-a second wiring terminal, 5-a first capacitor, 6-a second capacitor, 7-an output terminal, 8-a comparator, 9-a first resistor, 10-a second resistor, 11-a third resistor, 12-an AND gate, 13-a high-speed electronic switch, 14 a first partial discharge monitoring and fault online positioning device and 15 a second partial discharge monitoring and fault online positioning device.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
First embodiment
Fig. 1 to 4 show a first embodiment of a partial discharge monitoring and fault on-line locating device according to the present invention. The utility model provides a partial discharge monitoring and online positioner of trouble, wherein, including sensing unit, the range switching unit, voltage detection unit, signal adjustment unit, the sampling unit, central processing unit, communication module and GPS unit, sensing unit and voltage detection unit and range switching unit are connected, the range switching unit is connected with signal conditioning unit, signal conditioning unit and sampling unit are connected, the sampling unit is connected with central processing unit, central processing unit and communication module are connected, central processing unit and range switching unit are connected, central processing unit inputs sampling unit and range switching unit with control signal, central processing unit and communication module intercommunication each other.
The sensing unit adopts a pulse current capacitive coupling device, as shown in fig. 2, the pulse current capacitive coupling device includes an outer shielding shell 1, an inner electrode 2, a first binding post 3, a second binding post 4, a first capacitor 5, a second capacitor 6 and an output terminal 7, the inner electrode 2 penetrates through the outer shielding shell 1, the first binding post 3 and the second binding post 4 are located at two ends of the inner electrode 2, one end of the first capacitor 5 is connected with the inner electrode 2, the other end of the first capacitor 5 is connected with the second capacitor 6, the other end of the second capacitor 6 is connected with the outer shielding shell 1, the output terminal 7 is connected with the first capacitor 5 and the second capacitor 6, and the output terminal 7 is located on the outer shielding shell 1. When the cable wire to be tested is used, two ends of a shielding wire of the cable wire to be tested are connected into the first binding post 3 and the second binding post 4, and when the cable wire generates partial discharge or faults, the pulse current capacitive coupling device receives pulse current generated by coupling, and the pulse current is connected into the range switching unit and the voltage detection unit from the output terminal 7.
The voltage detection unit includes a first resistor 9, a second resistor 10, and a comparator 8, one end of the first resistor 9 is connected to the second resistor 10, the other end of the second resistor 10 is grounded, and the comparator 8 is connected to the first resistor 9 and the second resistor 10. The range switching unit comprises a high-speed electronic switch 13, an AND gate 12 and a third resistor 11, wherein one end of the third resistor 11 is connected with one end of the high-speed electronic switch 13, and the other end of the high-speed electronic switch 13 is connected with the AND gate 12.
In addition, the signal conditioning unit adopts a filter; the sampling unit adopts a data acquisition card; the communication module adopts a 4G wireless communication module.
The working principle of the embodiment is as follows: the method comprises the steps that two ends of a shielding wire of a cable wire to be tested are connected into a first binding post 3 and a second binding post 4 of a sensing unit in the embodiment, when the cable wire is subjected to partial discharge or fault, a pulse current capacitive coupling device receives pulse current generated by coupling, the pulse current is connected into a range switching unit and a voltage detection unit from an output terminal 7, a threshold value is arranged on the voltage detection unit, the pulse current is compared with the set threshold value, when the pulse current is larger than the set threshold value, the voltage detection unit sends a signal to enable the range switching unit to be switched to a fault large-current monitoring mode, and if the pulse current is not larger than the set threshold value, sampling is stopped; the signal conditioning unit carries out filtering processing on the pulse current signal; the sampling unit collects signals by using a sampling card; the central processing unit controls the sampling unit and the range switching unit, and a GPS unit connected with the central processing unit can evaluate and position the partial discharge or fault position in the cable wire.
Second embodiment
The embodiment is similar to embodiment 1, except that two partial discharge monitoring and fault online positioning devices, namely a first partial discharge monitoring and fault online positioning device 14 and a second partial discharge monitoring and fault online positioning device 15, are adopted in the embodiment, the two devices are respectively installed at two ends of a cable wire to form a set of positioning system, a high-speed electronic switch 13 of the two devices is turned on, a range switching unit is set to a fault small-current monitoring mode, and central processing units of the two devices send control signals to continuously receive and collect pulse current 1 s; when the voltage detection unit does not monitor a signal higher than a set threshold value, after sampling for 1s, the central processing unit sends a control signal, the sampling unit is stopped, when the voltage detection unit monitors a signal higher than the set threshold value, the central processing unit sends back a signal, the range switching unit is rapidly triggered, and a fault large-current monitoring mode is entered; after sampling for 1s, the central processing unit sends out a control signal and stops the sampling unit; the first partial discharge monitoring and fault on-line positioning device and the second partial discharge monitoring and fault on-line positioning device transmit the acquired signals to respective central processing units through the 4G wireless communication module to carry out partial discharge or fault position evaluation.
Surge wave head of fault or partial discharge at time t1And t2Reaching the first partial discharge monitoring and fault on-line locating device 14 and the second partial discharge monitoring and fault on-line locating device 15, the position d of the fault or partial discharge position from the first partial discharge monitoring and fault on-line locating device 14 can be represented by the formula d ═ l/2- (t-m1-t2) And v, wherein l is the whole length of the line, and v is the wave speed of the signal in the line.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a partial discharge monitoring and online positioner of trouble which characterized in that: including sensing unit, voltage detection unit, range switching unit, signal conditioning unit, sampling unit, central processing unit and communication module, the sensing unit with range switching unit electricity is connected, range switching unit with signal conditioning unit electricity is connected, signal conditioning unit with central processing unit electricity is connected, central processing unit with communication module electricity is connected, the sensing unit still with voltage detection unit electricity is connected, voltage detection unit with range switching unit electricity is connected, central processing unit with range switching unit electricity is connected, be equipped with the GPS unit on the sampling unit.
2. The partial discharge monitoring and fault on-line locating device of claim 1, wherein: the sensing unit adopts a pulse current capacitive coupling device.
3. The partial discharge monitoring and fault on-line locating device of claim 2, wherein: pulse current capacitive coupling device includes outer shielding shell (1), inner electrode (2), first terminal (3), second terminal (4), first electric capacity (5), second electric capacity (6) and output terminal (7), inner electrode (2) run through outer shielding shell (1), first terminal (3) are located with second terminal (4) the both ends of inner electrode (2), the one end of first electric capacity (5) with inner electrode (2) are connected, the other end of first electric capacity (5) with second electric capacity (6) are connected, the other end of second electric capacity (6) with outer shielding shell (1) are connected, output terminal (7) with first electric capacity (5) and second electric capacity (6) are connected, output terminal (7) are located on the outer shielding shell (1).
4. The partial discharge monitoring and fault on-line locating device of claim 3, wherein: the output terminal (7) adopts a BNC connector.
5. The partial discharge monitoring and fault on-line locating device of claim 1, wherein: the voltage detection unit comprises a first resistor (9), a second resistor (6) and a comparator (7), one end of the first resistor (9) is connected with one end of the second resistor (10), the other section of the second resistor (10) is grounded, and the comparator (7) is connected with the first resistor (9) and the second resistor (10).
6. The partial discharge monitoring and fault on-line locating device of claim 1, wherein: the range switching unit comprises a high-speed electronic switch (13), an AND gate (12) and a third resistor (11), wherein one end of the third resistor (11) is connected with one end of the high-speed electronic switch (13), and the other end of the high-speed electronic switch (13) is connected with the AND gate (12).
7. The partial discharge monitoring and fault on-line locating device of claim 1, wherein: the signal conditioning unit adopts a filter.
8. The partial discharge monitoring and fault on-line locating device of claim 1, wherein: the sampling unit adopts a data acquisition card.
9. The partial discharge monitoring and fault on-line locating device of claim 1, wherein: and the central processing unit sends control signals to the sampling unit and the sampling unit.
10. The partial discharge monitoring and fault on-line locating device of claim 1, wherein: the communication module adopts a 4G wireless communication module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010256619.4A CN111521907A (en) | 2020-06-01 | 2020-06-01 | Partial discharge monitoring and fault on-line positioning device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010256619.4A CN111521907A (en) | 2020-06-01 | 2020-06-01 | Partial discharge monitoring and fault on-line positioning device |
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| CN111521907A true CN111521907A (en) | 2020-08-11 |
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| CN202010256619.4A Pending CN111521907A (en) | 2020-06-01 | 2020-06-01 | Partial discharge monitoring and fault on-line positioning device |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101666849A (en) * | 2009-09-28 | 2010-03-10 | 西安交通大学 | Online monitoring device of partial discharge of high-voltage cable joint and online monitoring method thereof |
| CN202649392U (en) * | 2012-07-09 | 2013-01-02 | 广州供电局有限公司 | Portable partial discharge pulse current sensor |
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2020
- 2020-06-01 CN CN202010256619.4A patent/CN111521907A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101666849A (en) * | 2009-09-28 | 2010-03-10 | 西安交通大学 | Online monitoring device of partial discharge of high-voltage cable joint and online monitoring method thereof |
| CN202649392U (en) * | 2012-07-09 | 2013-01-02 | 广州供电局有限公司 | Portable partial discharge pulse current sensor |
Non-Patent Citations (1)
| Title |
|---|
| 刘基余: "《全球导航卫星系统及其应用》", 31 May 2015 * |
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Application publication date: 20200811 |