CN111781474A - Time-synchronous partial discharge double-end positioning device and method thereof - Google Patents
Time-synchronous partial discharge double-end positioning device and method thereof Download PDFInfo
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- 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
Abstract
The invention provides a time-synchronized partial discharge double-end positioning device which comprises a pressurizing end synchronous pulse sending module, a pressurizing end partial discharge acquisition module, a far end synchronous pulse coupling module, a far end partial discharge acquisition module, a double-end partial discharge data time synchronization module and a double-end partial discharge data analysis positioning module, wherein the pressurizing end synchronous pulse sending module is connected with the pressurizing end partial discharge acquisition module, the far end synchronous pulse coupling module is connected with the far end partial discharge acquisition module, the pressurizing end partial discharge acquisition module and the far end partial discharge acquisition module are both connected with the double-end partial discharge data time synchronization module, and the double-end partial discharge data time synchronization module is connected with the double-end partial discharge data analysis positioning module. The invention can realize high-precision double-end time synchronization and further realize high-precision double-end positioning of partial discharge.
Description
Technical Field
The invention relates to the technical field of local signal detection, in particular to a time-synchronized partial discharge double-end positioning device and a time-synchronized partial discharge double-end positioning method.
Background
Partial discharge has recently become an important indicator of insulation deterioration of power cables and has become an increasingly important place for field testing of power cables. The offline partial discharge detection and positioning are an important mode for detecting the power cable, and currently, the commonly used offline partial discharge field detection of the power cable mostly adopts damped oscillatory waves or ultralow frequency cosine square waves as an excitation power supply, and the two power supplies can effectively excite partial discharge and have good equivalence with a power frequency power supply, so that the power cable is widely applied.
The power cable off-line partial discharge positioning principle is based on the traveling wave reflection principle, the method can accurately position the partial discharge source point by utilizing the time difference of the first wave and the reflected wave according to the characteristic that partial discharge pulses generated by the partial discharge defect point are transmitted in the cable, and the positioning accuracy can reach the meter level. According to the traveling wave transmission principle, the partial discharge pulse is gradually attenuated along with the increase of the length of the cable in the transmission process of the power cable, and for a longer cable (more than 3km), the attenuation is large during testing, the reflected traveling wave is weak, and a partial discharge source point is difficult to locate. The problem is solved by adopting a single-end pressurization and double-end partial discharge measurement mode, and the requirement of data acquisition time precision at two ends is not more than 20ns when double-end partial discharge measurement is carried out due to the requirement of meter-level positioning precision, so that the time precision requirement can be met based on a GPS time synchronization mode and an optical fiber time synchronization mode at present. However, as a means for detecting the power cable on site, the two methods have limitations: the GPS time synchronization needs an open field, and the optical fiber time synchronization needs to be specially laid with synchronous optical fibers, so that the application of the power cable under various laying conditions cannot be met. The method of using the tested cable body as the time synchronization carrier mostly adopts an electromagnetic coupling mode to obtain the synchronization pulse, and the time synchronization pulse cannot be restored due to the low physical frequency band of the electromagnetic coupling mode, so that the error is large, and the requirement of meter-level positioning accuracy cannot be met. Chinese patent publication No. CN108169620A, published as 2018, 6, month and 15, which discloses a system, method and apparatus for fault location based on time synchronization, including: a first synchronous routing means for providing a first clock signal to a second synchronous routing means; the second synchronous routing device is connected with the first synchronous routing device and used for synchronizing a second clock signal of the second synchronous routing device with the first clock signal according to the first clock signal and synchronizing clock signals among the second synchronous routing devices; the synchronous positioning device is connected with the second synchronous routing device and used for acquiring cable data in the cable according to the clock signal output by the second synchronous routing device.
Disclosure of Invention
The invention aims to overcome the defects that the existing offline partial discharge device has large detection error and cannot meet the requirement of meter-level positioning accuracy, and provides a time-synchronous partial discharge double-end positioning device. The invention can realize high-precision double-end time synchronization and further realize high-precision double-end positioning of partial discharge.
The invention also provides a time-synchronous partial discharge double-end positioning method.
In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a time synchronization's partial discharge bi-polar positioner, wherein, puts collection module, far-end synchronous pulse coupling module, far-end office including pressurization end synchronous pulse sending module, pressurization end office and puts collection module, bi-polar office and put data time synchronization module and bi-polar office and put data analysis orientation module, pressurization end synchronous pulse sending module with the pressurization end office puts collection module and connects, far-end synchronous pulse coupling module with the collection module is put in the far-end office and connects, the collection module is put in the pressurization end office and the collection module is put in the far-end office all with bi-polar office puts data time synchronization module and connects, bi-polar office put data time synchronization module with bi-polar office puts data analysis orientation module and connects. In the technical scheme, a tested cable is connected to a pressurizing end synchronous pulse sending module and a far-end synchronous pulse coupling module, the pressurizing end synchronous pulse sending module sends time synchronous pulses to the tested cable, the far-end synchronous pulse coupling module is used for receiving the time synchronous pulses from a pressurizing end and generating local discharge signals on the tested cable, the pressurizing end local discharge acquisition module and the far-end local discharge acquisition module receive the local discharge signals at two ends of the tested cable, the signals collected by the pressurizing end local discharge acquisition module and the far-end local discharge acquisition module are input to a double-end local discharge data time synchronization module for synchronization, synchronous signal data are input to a double-end local discharge data analysis positioning module for analysis positioning, and a local discharge positioning result is given.
Furthermore, the pressurizing end partial discharge acquisition module and the far-end partial discharge acquisition module are connected with the double-end partial discharge data time synchronization module through a networking module. According to the technical scheme, the pressurizing end partial discharge acquisition module and the far end partial discharge acquisition module are connected into the cloud end through the networking module, data are combined at the cloud end, the double end partial discharge data time synchronization module can acquire the combined data from the cloud end in real time to synchronize, and if the networking module is not arranged, signals collected by the pressurizing end partial discharge acquisition module and the far end partial discharge acquisition module are manually combined and input into the double end partial discharge data time synchronization module after an experiment is finished.
Furthermore, the pressurizing end synchronous pulse sending module comprises a power circuit and a synchronous pulse sending circuit, the power circuit is connected with the synchronous pulse sending circuit, and the power circuit provides a working voltage VCC and a synchronous pulse amplitude voltage VDD for the synchronous pulse sending circuit.
Further, the synchronization pulse transmitting circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a microprocessor MCU, a first triode Q1 and an electric/optical conversion module, one end of the first resistor R1 is connected to the working voltage VCC, the other end of the first resistor R1 is connected to the microprocessor MCU, the other end of the first resistor R1 is further connected to the base of the first triode Q1, the other end of the microprocessor MCU is connected to the electric/optical conversion module, the electric/optical conversion module is connected to the voltage terminal amplifier collecting module, one end of the second resistor R2 is connected to the synchronization pulse amplitude voltage VDD, the other end of the second resistor R2 is connected to the collector of the first triode Q1, the emitter of the first triode Q1 is grounded, one end of the first capacitor C1 is connected to the collector of the first triode Q1, the other end of the first capacitor C1 is connected with one end of the third resistor R3, the other end of the third resistor R3 is grounded, and the other end of the first capacitor C1 is connected to the pressurizing terminal partial discharge acquisition module. The microprocessor MCU communicates with the pressurizing end office amplifier acquisition module through the electric/optical conversion module, executes the command of the pressurizing end office amplifier acquisition module and controls the synchronous pulse transmitting circuit. When the MCU does not send a control signal, the triode Q1 is cut off, and the VDD charges the capacitor C1 through a loop formed by the resistor R2 and the resistor R3; when the MCU sends a control signal, the triode Q1 is conducted, the capacitor C1 forms a loop with GND through the triode Q1, a pulse signal with the negative amplitude of VDD is generated, and the pulse signal is directly coupled into a tested cable.
Furthermore, the pressurizing end partial discharge acquisition module comprises an optical/electrical conversion module, a pressurizing end industrial personal computer, a pressurizing end acquisition card, a first partial discharge measurement impedance Z1 and a first resistance-capacitance voltage division/coupling circuit which are sequentially connected, the first partial discharge measurement impedance Z1 is grounded, the optical/electrical conversion module is connected with the electrical/optical conversion module, and one end, far away from the first partial discharge measurement impedance Z1, of the first resistance-capacitance voltage division/coupling circuit is connected with the first capacitor C1. One end of the first resistance-capacitance voltage division/coupling circuit, which is close to the first capacitor C1, is directly connected with a core of the cable to be detected, the first local discharge measurement impedance Z1 is grounded, the pressurization end industrial personal computer controls the pressurization end synchronous pulse sending module through an optical fiber, the pressurization end acquisition card is initialized before sending time synchronous pulses, the external pulse signal can be triggered, when the time synchronous pulses are sent, the pulse signal is directly coupled to the first local discharge impedance Z1 through the first resistance-capacitance voltage division/coupling circuit, and the pressurization end acquisition card is triggered to start to acquire local discharge signals.
Further, the far-end synchronous pulse coupling module includes a second resistance-capacitance voltage dividing/coupling circuit and a second partial discharge measurement impedance Z2 which are sequentially connected, one end of the second partial discharge measurement impedance Z2, which is far away from the second resistance-capacitance voltage dividing/coupling circuit, is connected to the far-end partial discharge acquisition module, and the second partial discharge measurement impedance Z2 is grounded. The far-end partial discharge acquisition module starts to acquire partial discharge data by taking the initial edge of the time synchronization pulse from the pressurization end received by the second resistance-capacitance voltage division/coupling circuit of the far-end synchronization pulse coupling module as a trigger signal. The far-end industrial personal computer controls the far-end acquisition card, initializes the far-end acquisition card before the pressurizing end emits the time synchronization pulse through a network or a manual mode, triggers the far-end acquisition card through an external pulse signal, couples the pulse signal to a second partial discharge impedance Z2 through a second resistance-capacitance voltage division/coupling circuit when the synchronization pulse reaches the far end, and triggers the far-end acquisition card to start to acquire a partial discharge signal.
A time-synchronized partial discharge double-end positioning method comprises the following steps:
s1, separating a tested cable from a power grid, grounding, discharging, and connecting a pressurizing end synchronous pulse sending module and a far-end synchronous pulse coupling module to two ends of the tested cable;
s2, a pressurizing end synchronous pulse sending module sends a time synchronous pulse to the tested cable, and simultaneously triggers a pressurizing end local discharge acquisition module to start data acquisition;
s3, the far-end synchronous pulse coupling module receives the time synchronous pulse and simultaneously triggers the far-end partial discharge acquisition module to start data acquisition;
s4, data of the pressurizing end partial discharge acquisition module and data of the far-end partial discharge acquisition module are combined and input into a double-end partial discharge data time synchronization module for synchronization;
and S5, analyzing and positioning the data by the double-end partial discharge data analyzing and positioning module according to the synchronized data by adopting a traveling wave positioning principle, and giving a partial discharge positioning result.
Further, in step S4, the data of the pressurizing end partial discharge acquisition module and the data of the remote end partial discharge acquisition module are uploaded to the cloud through the networking module and are merged and input into the double end partial discharge data time synchronization module.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts the tested cable body as the carrier of the time synchronization pulse, directly sends the time synchronization pulse to the tested cable through the pressurizing end synchronization pulse sending module to realize the time synchronization, realizes the high-precision double-end time synchronization under the condition of not increasing time synchronization hardware, and completes the double-end detection and positioning of the partial discharge of the long-distance cable on the basis. The invention takes the tested cable body as the carrier of the time synchronization pulse, so the field application of the invention is not influenced by the cable laying environment, and the invention can be flexibly applied to the partial discharge detection and positioning field excited by the damping oscillation wave voltage source and the ultralow frequency cosine square wave voltage source. The invention connects the core of the tested cable through the resistance-capacitance voltage division/coupling circuit to directly couple and restore the time synchronization pulse signal, thereby realizing high-precision double-end time synchronization and further realizing the high-precision double-end positioning of partial discharge.
Drawings
Fig. 1 is a schematic diagram of an overall structure of a time-synchronized partial discharge double-end positioning device according to the present invention.
Fig. 2 is a schematic circuit diagram of a pressurizing end synchronous pulse transmitting module and a pressurizing end partial discharge acquisition module in the time-synchronized partial discharge double-end positioning device of the present invention.
Fig. 3 is a schematic circuit diagram of a far-end synchronization pulse coupling module and a far-end partial discharge acquisition module in a time-synchronized partial discharge double-end positioning device according to the present invention.
Fig. 4 is a schematic flow chart of a time-synchronized partial discharge double-end positioning method according to the present invention.
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.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Example 1
Fig. 1 to 3 show an embodiment of a time-synchronized partial discharge double-end positioning device according to the present invention. A time-synchronized partial discharge double-end positioning device is shown in figure 1 and comprises a pressurizing end synchronous pulse sending module, a pressurizing end partial discharge acquisition module, a far end synchronous pulse coupling module, a far end partial discharge acquisition module, a double-end partial discharge data time synchronization module and a double-end partial discharge data analysis positioning module, wherein the pressurizing end synchronous pulse sending module is connected with the pressurizing end partial discharge acquisition module, the far end synchronous pulse coupling module is connected with the far end partial discharge acquisition module, the pressurizing end partial discharge acquisition module and the far end partial discharge acquisition module are connected with the double-end partial discharge data time synchronization module through a networking module, and the double-end partial discharge data time synchronization module is connected with the double-end partial discharge data analysis positioning module. The tested cable is connected between the pressurizing end synchronous pulse transmitting module and the far end synchronous pulse coupling module.
In this embodiment, as shown in fig. 2, the voltage-end synchronization pulse sending module includes a power supply loop and a synchronization pulse sending circuit, and the power supply loop provides a working voltage VCC and a synchronization pulse amplitude voltage VDD for the synchronization pulse sending circuit. The synchronous pulse circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a microprocessor MCU, a first triode Q1 and an electric/optical conversion module, one end of a first resistor R1 is connected with a working voltage VCC, the other end of the first resistor R1 is connected with a microprocessor MCU, the other end of the first resistor R1 is further connected with a base electrode of a first triode Q1, the other end of the microprocessor MCU is connected with an electric/optical conversion module, the electric/optical conversion module is connected to a pressurizing end local amplifier acquisition module, one end of a second resistor R2 is connected with a synchronous pulse amplitude voltage VDD, the other end of the second resistor R2 is connected with a collector of a first triode Q1, an emitter of the first triode Q1 is grounded, one end of a first capacitor C1 is connected with a collector of a first triode Q1, the other end of the first capacitor C1 is connected with a grounded third resistor R3, and the other end of the first capacitor C1 is connected to the pressurizing end local amplifier acquisition module.
In this embodiment, the pressure end partial discharge acquisition module includes an optical/electrical conversion module, a pressure end industrial personal computer, a pressure end acquisition card, a first partial discharge measurement impedance Z1, and a first resistance-capacitance voltage division/coupling circuit, which are connected in sequence, where the first partial discharge measurement impedance Z1 is grounded, the optical/electrical conversion module is connected to the electrical/optical conversion module, and one end of the first resistance-capacitance voltage division/coupling circuit, which is far away from the first partial discharge measurement impedance Z1, is connected to the first capacitor C1. One end of a first resistance-capacitance voltage division/coupling circuit, which is close to a first capacitor C1, is directly connected with a core of a cable to be detected, a first local discharge measurement impedance Z1 is grounded, a pressurization end industrial personal computer controls a pressurization end synchronous pulse sending module through an optical fiber, a pressurization end acquisition card is initialized before time synchronous pulses are sent, the pressurization end acquisition card can be triggered through an external pulse signal, the acquisition rate of the acquisition card is 200MS/s, when the time synchronous pulses are sent, the pulse signal is directly coupled to the first local discharge impedance Z1 through the first resistance-capacitance voltage division/coupling circuit, and the pressurization end acquisition card is triggered to start to acquire local discharge signals.
In this embodiment, as shown in fig. 3, the far-end synchronous pulse coupling module includes a second resistance-capacitance voltage dividing/coupling circuit and a second partial discharge measurement impedance Z2, one end of the second partial discharge measurement impedance Z2, which is far away from the second resistance-capacitance voltage dividing/coupling circuit, is connected to the far-end partial discharge acquisition module, the second partial discharge measurement impedance Z2 is grounded, the far-end partial discharge acquisition module includes a far-end acquisition card and a far-end industrial personal computer, which are connected in sequence, and the second partial discharge measurement impedance Z2 is connected to the far-end acquisition card. The remote end partial discharge acquisition module starts to acquire partial discharge data by using a time synchronization pulse starting edge from a pressurizing end received by a second resistance-capacitance voltage division/coupling circuit of the remote end synchronization pulse coupling module as a trigger signal, the detailed process is as shown below, the remote end industrial personal computer controls the remote end acquisition card, the remote end industrial personal computer can initialize the remote end acquisition card before the pressurizing end transmits the time synchronization pulse through a network or a manual mode, the acquisition rate of the remote end acquisition card is 200MS/s, when the time synchronization pulse reaches the remote end, the pulse signal is coupled to a second partial discharge impedance Z2 through the second resistance-capacitance voltage division/coupling circuit, and the remote end acquisition card is triggered to start to acquire a partial discharge signal.
The working principle of the embodiment is as follows: in the embodiment, a tested cable is connected to a pressurizing end synchronous pulse sending module and a far end synchronous pulse coupling module, the pressurizing end synchronous pulse sending module sends time synchronous pulses to the tested cable, the far end synchronous pulse coupling module is used for receiving and coupling the time synchronous pulses from the pressurizing end and local discharge signals generated on the tested cable, the pressurizing end local discharge acquisition module and the far end local discharge acquisition module acquire local discharge signal data at two ends of the tested cable, the acquired signal data are combined and input to a double-end local discharge data time synchronization module through a networking module for synchronization, the double-end local discharge data adopt the time synchronous pulses as trigger sources, the initial time difference of the double-end local discharge acquisition is the transmission time of the synchronous pulses on the tested cable, and by inquiring the time synchronous pulse waveform in the double-end local discharge data, a waveform comparison technology is adopted, and overlapping time synchronization pulses and writing synchronization timestamps into the double-end partial discharge data to complete time synchronization of the double-end partial discharge data, inputting the synchronized signal data into a double-end partial discharge data analysis positioning module for analysis and positioning, and giving out a partial discharge positioning result.
Example 2
Fig. 4 shows an embodiment of a time-synchronized partial discharge double-end positioning method according to the present invention, which includes the following steps:
s1, separating a tested cable from a power grid, grounding, discharging, and connecting a pressurizing end synchronous pulse sending module and a far-end synchronous pulse coupling module to two ends of the tested cable;
s2, pressurizing the tested cable at the pressurizing end, sending a time synchronization pulse to the tested cable by the pressurizing end synchronization pulse sending module, and triggering the pressurizing end local amplifier acquisition module to start data acquisition;
s3, the far-end synchronous pulse coupling module receives time synchronous pulses and triggers the far-end partial discharge acquisition module to start data acquisition;
s4, data of the pressurizing end partial discharge acquisition module and data of the far-end partial discharge acquisition module are combined and input into a double-end partial discharge data time synchronization module for synchronization;
and S5, analyzing and positioning the data by the double-end partial discharge data analyzing and positioning module according to the synchronized data by adopting a traveling wave positioning principle, and giving a partial discharge positioning result.
In this embodiment, in step S4, if the data of the pressurizing end partial discharge acquisition module and the remote end partial discharge acquisition module are uploaded to the cloud through the networking module, the dual-end partial discharge data time synchronization module may acquire the dual-end partial discharge data that is automatically merged and uploaded, and if the data is not accessed to the cloud, the data needs to be manually merged and then input to the dual-end partial discharge data time synchronization module to merge the dual-end partial discharge data.
In this embodiment, in step S4, because the double-end partial discharge data all use time synchronization pulses as trigger sources, the time difference of the initial acquisition of the double-end partial discharge is the transmission time of the synchronization pulses in the tested cable, and the time pulses are first superimposed to make the initial time of the double-end data the same, the time difference between the far-end partial discharge data and the pressurization end partial discharge data is the transmission time of the time synchronization pulses in the tested cable, which can be expressed by the following formula:
where Δ T is the time difference between the remote end partial discharge data and the pressurized end partial discharge data, l is the total length of the cable under test, and v is the speed at which the pulse is transmitted through the cable under test. Because the full length l of the tested cable and the transmission speed v of the pulse in the tested cable are known, the time difference delta T between the far-end partial discharge data and the pressurizing end partial discharge data can be easily obtained, and the synchronization of the double-end partial discharge data is realized.
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. A time-synchronized partial discharge double-end positioning device is characterized in that: including pressurization end synchronous pulse sending module, pressurization end partial discharge collection module, far-end synchronous pulse coupling module, far-end partial discharge collection module, bi-polar partial discharge data time synchronization module and bi-polar partial discharge data analysis positioning module, pressurization end synchronous pulse sending module with the pressurization end partial discharge collection module is connected, far-end synchronous pulse coupling module with the far-end partial discharge collection module is connected, pressurization end partial discharge collection module and far-end partial discharge collection module all with bi-polar partial discharge data time synchronization module is connected, bi-polar partial discharge data time synchronization module with bi-polar partial discharge data analysis positioning module is connected.
2. A time-synchronized partial discharge double-ended positioning device according to claim 1, wherein: the pressurizing end partial discharge acquisition module and the far end partial discharge acquisition module are connected with the double-end partial discharge data time synchronization module through a networking module.
3. A time-synchronized partial discharge double-ended positioning device according to claim 2, wherein: the pressurizing end synchronous pulse sending module comprises a power supply loop and a synchronous pulse sending circuit, and the power supply loop is connected with the synchronous pulse sending circuit.
4. A time-synchronized partial discharge double-ended positioning device according to claim 3, wherein: and the power supply loop provides a working voltage VCC and a synchronous pulse amplitude voltage VDD for the synchronous pulse sending circuit.
5. A time-synchronized partial discharge double-ended positioning device according to claim 4, wherein: the synchronous pulse transmitting circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a microprocessor MCU, a first triode Q1 and an electric/optical conversion module, wherein one end of the first resistor R1 is connected with the working voltage VCC, the other end of the first resistor R1 is connected with the microprocessor MCU, the other end of the first resistor R1 is also connected with the base of the first triode Q1, the other end of the microprocessor MCU is connected with the electric/optical conversion module, the electric/optical conversion module is connected to the pressurizing end local amplifier acquisition module, one end of the second resistor R2 is connected with the synchronous pulse amplitude voltage VDD, the other end of the second resistor R2 is connected with the collector of the first triode Q1, the emitter of the first triode Q1 is grounded, one end of the first capacitor C1 is connected with the collector of the first triode Q1, the other end of the first capacitor C1 is connected with one end of the third resistor R3, the other end of the third resistor R3 is grounded, and the other end of the first capacitor C1 is connected to the pressurizing terminal partial discharge acquisition module.
6. A time-synchronized partial discharge double-ended positioning device according to claim 5, wherein: the pressurization end partial discharge acquisition module comprises an optical/electric conversion module, a pressurization end industrial personal computer, a pressurization end acquisition card, a first partial discharge measurement impedance Z1 and a first resistance-capacitance voltage division/coupling circuit which are sequentially connected, wherein the first partial discharge measurement impedance Z1 is grounded, the optical/electric conversion module is connected with the electric/optical conversion module, and one end, far away from the first partial discharge measurement impedance Z1, of the first resistance-capacitance voltage division/coupling circuit is connected with the first capacitor C1.
7. A time-synchronized partial discharge double-ended positioning device according to claim 6, wherein: the far-end synchronous pulse coupling module comprises a second resistance-capacitance voltage division/coupling circuit and a second partial discharge measurement impedance Z2 which are sequentially connected, one end, far away from the second resistance-capacitance voltage division/coupling circuit, of the second partial discharge measurement impedance Z2 is connected with the far-end partial discharge acquisition module, and the second partial discharge measurement impedance Z2 is grounded.
8. A time-synchronized partial discharge double-ended positioning device according to claim 7, wherein: the far-end partial discharge acquisition module comprises a far-end acquisition card and a far-end industrial personal computer which are sequentially connected, and the second partial discharge measurement impedance Z2 is connected with the far-end acquisition card.
9. A time-synchronized partial discharge double-end positioning method is characterized in that: comprises the following steps
S1, separating a tested cable from a power grid, grounding, discharging, and connecting a pressurizing end synchronous pulse sending module and a far-end synchronous pulse coupling module to two ends of the tested cable;
s2, a pressurizing end synchronous pulse sending module sends a time synchronous pulse to the tested cable, and simultaneously triggers a pressurizing end local discharge acquisition module to start data acquisition;
s3, the far-end synchronous pulse coupling module receives the time synchronous pulse and simultaneously triggers the far-end partial discharge acquisition module to start data acquisition;
s4, data of the pressurizing end partial discharge acquisition module and data of the far-end partial discharge acquisition module are combined and input into a double-end partial discharge data time synchronization module for synchronization;
and S5, analyzing and positioning the data by the double-end partial discharge data analyzing and positioning module according to the synchronized data by adopting a traveling wave positioning principle, and giving a partial discharge positioning result.
10. A time-synchronized partial discharge double-ended positioning method according to claim 9, characterized in that: in step S4, the data of the pressurizing end partial discharge acquisition module and the data of the remote end partial discharge acquisition module are uploaded to the cloud via the networking module and are merged and input into the double end partial discharge data time synchronization module.
Priority Applications (1)
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