CN202794435U - Wireless high-precision synchronous phase reference device - Google Patents
Wireless high-precision synchronous phase reference device Download PDFInfo
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- CN202794435U CN202794435U CN201120381922.3U CN201120381922U CN202794435U CN 202794435 U CN202794435 U CN 202794435U CN 201120381922 U CN201120381922 U CN 201120381922U CN 202794435 U CN202794435 U CN 202794435U
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Abstract
The utility model discloses a wireless high-precision synchronous phase reference device so as to get phase difference between leakage current and corresponding system-side voltage, and further to realize precise measurement on relevant parameters of the leakage current and dielectric loss. The device comprises a system-side voltage detection module, a leakage current field current detection module, and a synchronous voltage phase module, wherein the system-side voltage detection module is provided with a first GPS receiving unit and a first communication unit, the leakage current field current detection module is provided with a second GPS receiving unit and a second communication unit, and the synchronous voltage phase module is used for synchronizing sampling results of the leakage current and the system-side voltage according to a GPS time label so as to get the phase difference between the leakage current and the corresponding system-side voltage, and to further realize the precise measurement on the relevant parameters of the leakage current and the dielectric loss. The synchronous voltage phase module is communicated and connected with at least one communication unit of the first and the second communication units in a wireless manner.
Description
Technical field
The utility model belongs to the grid equipment technical field of measurement and test, and a kind of wireless high-precise synchronization phase reference device is provided, and is mainly used in dielectric loss and the leakage current testing of electrical network capacitive apparatus.
Background technology
Working voltage is born in the insulation of grid equipment for a long time, and insulation may be deteriorated under the cumulative effect, causes potential safety hazard.Insulation status deteriorated can cause leakage current and insulation dielectric loss to increase, and so that the temperature variant characteristic of dielectric loss becomes precipitous, the leakage current under the running status and dielectric loss are the actual parameters that characterizes state of insulation.The large capacity of electrical network forward, UHV (ultra-high voltage) and trans-regional large web frame development, the expansion of electrical network scale requires more and more higher to system stability, safety in operation and economy, national grid and south electric network and each genco and relevant large-scale power user have proposed the requirement of equipment state overhauling, under the condition of charged or the on-line operation that do not have a power failure, realize a plurality of parameters such as apparatus insulated state are detected, and main equipment carried out state estimation, for maintenance provides science decision.For the requirement of adaptive state maintenance, must use novel state of insulation diagnostic system and come the General Promotion required level of service.
The key of leakage current, dielectric loss live line measurement or on-line measurement is the phase place of the system side voltage of the amplitude of accurate collecting device leakage current and phase place, corresponding voltage grade, then calculate the current/voltage phase differential that gathers, thereby calculate resistive, the capacitive component of leakage current, the tangent value that perhaps calculates its dielectric loss angle obtains dielectric loss, and key is to ask for the phase differential of the system side voltage of leakage current and correspondence.
The phase difference value that obtains two coherent signals at the electrical network scene can be taked the way of hardware and software analysis.Taked the hardware circuit of zero balancing can obtain the phase differential of two signals, but be subject to the impact of the factors such as hardware circuit datum drift, circuit degree of unbalancedness, repeatability is relatively poor as a result, and is subject to easily the impact of temperature variation; The method of software is the discrete digital signal that gathers the voltage and current of corresponding length, utilize Fourier transform to calculate its phase place and amplitude, the prerequisite of the method is to guarantee that the discrete data collection of voltage and current is synchronous and constant duration, in the prior art, synchronous error has exceeded the measuring error permissible range of dielectric loss.
The utility model content
Fundamental purpose of the present utility model is to disclose a kind of high-accuracy voltage phase reference device, asking for the phase differential of Leakage Current and corresponding system side voltage, and then realizes the accurate measurement of leakage current correlation parameter and dielectric loss.
For reaching above-mentioned purpose, the disclosed wireless high-precise synchronization phase reference device of the utility model comprises:
Be provided with the system side voltage detection module of a GPS receiving element and the first communication unit, phase place and amplitude that the pulse per second (PPS) sample detecting system side voltage that provides according to a described GPS receiving element is provided, and send to the synchronizing voltage phase module by described the first communication unit after the sample detecting result stamped the gps time label;
Be provided with the on-the-spot current detection module of Leakage Current of the 2nd GPS receiving element and the second communication unit, phase place and amplitude that the pulse per second (PPS) sample detecting Leakage Current scene that provides according to described the 2nd GPS receiving element is provided, and send to the synchronizing voltage phase module by described the second communication unit after the sample detecting result stamped the gps time label;
The synchronizing voltage phase module, be used for the sampled result according to the synchronous described Leakage Current of gps time label and system side voltage, asking for the phase differential of Leakage Current and corresponding system side voltage, and then realize the accurate measurement of leakage current correlation parameter and dielectric loss;
Wherein said synchronizing voltage phase module is carried out communication with at least one communication unit in described the first and second communication units with wireless mode and is connected.Preferably, described synchronizing voltage phase module and described the first communication unit have been set up wireless connections and have been integrated on the on-the-spot current detection module of described Leakage Current, and described the second communication unit is for connecting the functional unit of the on-the-spot current detection module of described Leakage Current and described synchronizing voltage phase module.
Better, above-mentioned synchronizing voltage phase module is also set up with the electrical network production MIS has communication to be connected.
In a specific embodiment, said system side voltage detection module also comprises:
The digital signal processor that is connected with clock circuit, reset circuit, electric power management circuit, storer is for phase place and the amplitude at the pulse per second (PPS) sample detecting Leakage Current scene that provides according to above-mentioned the 2nd GPS receiving element;
The analog to digital converter that is connected with above-mentioned digital signal processor;
The floating-point gain circuitry that is connected with analog to digital converter; And
With the buffer circuit that the floating-point gain circuitry is connected, its input end connects voltage signal UA, UB, the UC that obtains from system voltage mutual inductor secondary side.
Optionally, the working power of said system side voltage detection module is electric main or lithium battery power supply, and is provided with the power control unit that switches between electric main or lithium battery.
The utility model, cover the electrical network test site by wireless mode, corresponding current detecting unit receiver voltage phase reference also calculates both phase differential, the pps pulse per second signal that the enabling signal of data acquisition is sent from the GPS receiver, the signal synchronization accuracy is better than 100ns, the highest can be to 40ns; Thereby realize the accurate measurement of leakage current correlation parameter and dielectric loss.At least have following beneficial effect:
1, thoroughly solves dielectric loss and the leakage current on-the-spot test signal synchronous collection problem of electrical network capacitive apparatus;
2, improve phase differential resolution rate, dielectric loss resolution to 0.001% or higher has improved an order of magnitude in theory;
3, reduce the dielectric loss of electrical network capacitive apparatus and the length of arrangement wire of leakage current Online Transaction Processing, save wiring cost, improved efficiency, promoted simultaneously system reliability.
Description of drawings
Fig. 1 is the structured flowchart of the disclosed wireless high-accuracy voltage phase reference device of the utility model embodiment;
Fig. 2 is the structural representation of system side voltage detection module among Fig. 1.
Embodiment
Below in conjunction with Figure of description specific embodiment of the utility model is described in detail.
Present embodiment discloses a kind of wireless high-precise synchronization phase reference device, as shown in Figure 1, at least comprise: the on-the-spot current detection module 3 of synchronizing voltage phase module 1 and the system side voltage detection module 2 that connects thereof and Leakage Current, function and the inner structure of each module are described below:
The system side voltage detection module, it is provided with a GPS receiving element 21 and the first communication unit 22, phase place and amplitude that the pulse per second (PPS) sample detecting system side voltage that provides according to a GPS receiving element is provided, and send to the synchronizing voltage phase module by the first communication unit after the sample detecting result stamped the gps time label;
The on-the-spot current detection module of Leakage Current, it is provided with the 2nd GPS receiving element 31 and the second communication unit 32, phase place and amplitude that the pulse per second (PPS) sample detecting Leakage Current scene that provides according to the 2nd GPS receiving element is provided, and send to the synchronizing voltage phase module by the second communication unit after the sample detecting result stamped the gps time label;
Carry out the synchronizing voltage phase module that communication is connected with at least one communication unit in the first and second communication units with wireless mode, be used for the sampled result according to the synchronous Leakage Current of gps time label and system side voltage, asking for the phase differential of Leakage Current and corresponding system side voltage, and then realize the accurate measurement of leakage current correlation parameter and dielectric loss.
In the present embodiment, the pulse per second (PPS) rising edge that an above-mentioned GPS receiving element and the 2nd GPS receiving element all accept to generate after the positioning signal of gps satellite emission and the time signal generates, per second once, the on-the-spot current detection module of a synchronous start-up system side voltage detection module and Leakage Current carries out sample detecting.In addition, ask for quickly and easily the phase differential of the system side voltage of Leakage Current and correspondence for ease of the tester at Leakage Current scene, and then the accurate measurement of realization leakage current correlation parameter and dielectric loss, preferably, above-mentioned synchronizing voltage phase module and the first communication unit have been set up wireless connections and be integrated on the on-the-spot current detection module of Leakage Current, wherein the second communication unit is for connecting the functional unit of the on-the-spot current detection module of Leakage Current and synchronizing voltage phase module.
In other embodiments, above-mentioned synchronizing voltage phase module and above-mentioned the second communication unit have been set up wireless connections and have been integrated on the said system voltage detection module, above-mentioned the first communication unit all carries out communication with wireless mode and connects for connecting the functional unit of said system voltage detection module and above-mentioned synchronizing voltage phase module.This all belongs to protection domain of the present utility model, follow-up repeating no more.
In the present embodiment, better, above-mentioned synchronizing voltage phase module is also set up with the electrical network production MIS has communication to be connected, to realize sharing of data.
Optionally, as shown in Figure 2, said system side voltage detection module also comprises:
The digital signal processor 23 that is connected with clock circuit, reset circuit, electric power management circuit, storer, its with an above-mentioned GPS receiving element be connected communication unit and be connected, phase place and the amplitude at the pulse per second (PPS) sample detecting Leakage Current scene that provides according to an above-mentioned GPS receiving element is provided; Wherein this digital signal processor includes but not limited to the TMS320F28335 digital signal processor;
The analog to digital converter 24 that is connected with above-mentioned digital signal processor;
The floating-point gain circuitry 25 that is connected with analog to digital converter, the effect of this floating-point gain circuitry is the enlargement factor that the difference according to the sample size provides, can improve resolution and the precision of near the section of signal zero crossing, thereby improve the accuracy of the phase measurement of signal; And
The buffer circuit 26 that is connected with the floating-point gain circuitry, its input end connects voltage signal UA, UB, UC and the ground connection N that obtains from system voltage mutual inductor secondary side, the effect of this buffer circuit is signal ground and the earth of isolation measurement system, eliminate ground potential to the impact of accuracy of measurement, improve accuracy and reliability.In other embodiments, this voltage signal UA, UB, UC can also obtain from the pulpit panel board.
Further, as shown in Figure 2, the working power of said system side voltage detection module is 220V electric main or lithium battery power supply, and is provided with the power control unit 27 that switches between electric main or lithium battery; To guarantee the sustainability of system side voltage detection module work.
As shown in Figure 2, the pps pulse per second signal that the enabling signal of data acquisition is sent from a GPS receiving element, the signal synchronization accuracy is better than 100ns, the highest can be to 40ns; Voltage signal UA, UB, UC, behind signal isolation circuit and floating-point programme-controlled gain, be input to high precision digital-to-analog converter, if the floating-point gain circuitry provides the data resolution of high 3bit, analog-digital chip provides the data resolution of low 16bit, and then the data resolution of this system side voltage detection module can reach 19bit; Image data is delivered to high speed digital signal processor, through Fast Fourier Transform (FFT), asks for phase place and the amplitude of voltage signal; Then can will send to the synchronizing voltage phase module with wireless communication mode after the related data packing framing based on the gps time label by the first communication unit again.
Present embodiment, realize by the pulse per second (PPS) rising edge of GPS receiving unit synchronously, after being detected by current detecting unit with the data of time tag, the dielectric loss of electrical network capacitive apparatus and the on-the-spot test of leakage current are finished in the data combination identical with himself time tag.To sum up, cover the electrical network test site by wireless mode, corresponding current detecting unit receiver voltage phase reference also calculates both phase differential, the pps pulse per second signal that the enabling signal of data acquisition is sent from the GPS receiver, the signal synchronization accuracy is better than 100ns, the highest can be to 40ns; Thereby realize the accurate measurement of leakage current correlation parameter and dielectric loss.Thereby so that present embodiment has following beneficial effect at least:
1, thoroughly solves dielectric loss and the leakage current on-the-spot test signal synchronous collection problem of electrical network capacitive apparatus;
2, improve phase differential resolution rate, dielectric loss resolution to 0.001% or higher has improved an order of magnitude in theory;
3, reduce the dielectric loss of electrical network capacitive apparatus and the length of arrangement wire of leakage current Online Transaction Processing, save wiring cost, improved efficiency, promoted simultaneously system reliability.
It should be noted that at last: above embodiment only in order to the technical solution of the utility model to be described, is not intended to limit; Although with reference to previous embodiment the utility model is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (7)
1. wireless high-precise synchronization phase reference device is characterized in that: comprising:
Be provided with the system side voltage detection module of a GPS receiving element and the first communication unit, phase place and amplitude that the pulse per second (PPS) sample detecting system side voltage that provides according to a described GPS receiving element is provided, and send to the synchronizing voltage phase module by described the first communication unit after the sample detecting result stamped the gps time label;
Be provided with the on-the-spot current detection module of Leakage Current of the 2nd GPS receiving element and the second communication unit, phase place and amplitude that the pulse per second (PPS) sample detecting Leakage Current scene that provides according to described the 2nd GPS receiving element is provided, and send to the synchronizing voltage phase module by described the second communication unit after the sample detecting result stamped the gps time label; And
The synchronizing voltage phase module, be used for the sampled result according to the synchronous described Leakage Current of gps time label and system side voltage, asking for the phase differential of Leakage Current and corresponding system side voltage, and then realize the accurate measurement of leakage current correlation parameter and dielectric loss;
Wherein said synchronizing voltage phase module is carried out communication with at least one communication unit in described the first and second communication units with wireless mode and is connected.
2. wireless high-precise synchronization phase reference device according to claim 1 is characterized in that: described synchronizing voltage phase module is also set up with the electrical network production MIS has communication to be connected.
3. wireless high-precise synchronization phase reference device according to claim 1 and 2, it is characterized in that: described system side voltage detection module also comprises:
The digital signal processor that is connected with clock circuit, reset circuit, electric power management circuit, storer, its with a described GPS receiving element be connected communication unit and be connected, phase place and the amplitude at the pulse per second (PPS) sample detecting Leakage Current scene that provides according to a described GPS receiving element is provided;
The analog to digital converter that is connected with described digital signal processor;
The floating-point gain circuitry that is connected with analog to digital converter; And
With the buffer circuit that the floating-point gain circuitry is connected, its input end connects voltage signal UA, UB, UC and the ground connection N that obtains from system voltage mutual inductor secondary side.
4. wireless high-precise synchronization phase reference device according to claim 3, it is characterized in that: the working power of described system side voltage detection module is electric main or lithium battery power supply, and is provided with the power control unit that switches between electric main or lithium battery.
5. wireless high-precise synchronization phase reference device according to claim 1, it is characterized in that: described synchronizing voltage phase module and described the first communication unit have been set up wireless connections and have been integrated on the on-the-spot current detection module of described Leakage Current, and described the second communication unit is for connecting the functional unit of the on-the-spot current detection module of described Leakage Current and described synchronizing voltage phase module.
6. wireless high-precise synchronization phase reference device according to claim 1 and 2, it is characterized in that: described synchronizing voltage phase module and described the second communication unit have been set up wireless connections and have been integrated on the described system voltage detection module, and described the first communication unit is for connecting the functional unit of described system voltage detection module and described synchronizing voltage phase module.
7. wireless high-precise synchronization phase reference device according to claim 1 and 2, it is characterized in that: described synchronizing voltage phase module is all carried out communication with wireless mode with described the first and second communication units and is connected.
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| CN201120381922.3U CN202794435U (en) | 2011-10-10 | 2011-10-10 | Wireless high-precision synchronous phase reference device |
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| CN201120381922.3U CN202794435U (en) | 2011-10-10 | 2011-10-10 | Wireless high-precision synchronous phase reference device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777077A (en) * | 2014-02-20 | 2014-05-07 | 陈勇 | Wireless pincerlike phase detection device |
| CN104090162A (en) * | 2014-06-17 | 2014-10-08 | 国家电网公司 | Method for measuring system voltage and current angles without voltage transformer |
| CN104808062A (en) * | 2015-05-21 | 2015-07-29 | 云南电网有限责任公司 | Different-place voltage-current phase difference measuring system |
| CN107063221A (en) * | 2015-11-09 | 2017-08-18 | 精工爱普生株式会社 | Physical quantity detection circuit, electronic equipment and moving body |
| CN107884737A (en) * | 2017-11-13 | 2018-04-06 | 国网福建省电力有限公司 | The live capacitive apparatus on-line monitoring check system and method for wireless high-precise synchronization |
| CN108535551A (en) * | 2018-05-11 | 2018-09-14 | 华中科技大学 | A kind of dielectric loss method for synchronously measuring based on wireless telecommunications |
| CN108872711A (en) * | 2018-05-11 | 2018-11-23 | 华中科技大学 | A kind of dielectric loss method for synchronously measuring based on same AC power source |
| CN110208665A (en) * | 2019-07-05 | 2019-09-06 | 杭州西湖电子研究所 | A kind of detection method of wide area with respect to dielectric loss |
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2011
- 2011-10-10 CN CN201120381922.3U patent/CN202794435U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777077A (en) * | 2014-02-20 | 2014-05-07 | 陈勇 | Wireless pincerlike phase detection device |
| CN104090162A (en) * | 2014-06-17 | 2014-10-08 | 国家电网公司 | Method for measuring system voltage and current angles without voltage transformer |
| CN104808062A (en) * | 2015-05-21 | 2015-07-29 | 云南电网有限责任公司 | Different-place voltage-current phase difference measuring system |
| CN107063221A (en) * | 2015-11-09 | 2017-08-18 | 精工爱普生株式会社 | Physical quantity detection circuit, electronic equipment and moving body |
| CN107063221B (en) * | 2015-11-09 | 2020-11-06 | 精工爱普生株式会社 | Physical quantity detection circuit, electronic apparatus, and moving object |
| CN107884737A (en) * | 2017-11-13 | 2018-04-06 | 国网福建省电力有限公司 | The live capacitive apparatus on-line monitoring check system and method for wireless high-precise synchronization |
| CN107884737B (en) * | 2017-11-13 | 2020-02-14 | 国网福建省电力有限公司 | Wireless high-precision synchronous on-site capacitive equipment on-line monitoring and checking system and method |
| CN108535551A (en) * | 2018-05-11 | 2018-09-14 | 华中科技大学 | A kind of dielectric loss method for synchronously measuring based on wireless telecommunications |
| CN108872711A (en) * | 2018-05-11 | 2018-11-23 | 华中科技大学 | A kind of dielectric loss method for synchronously measuring based on same AC power source |
| CN108535551B (en) * | 2018-05-11 | 2019-09-20 | 华中科技大学 | A kind of dielectric loss method for synchronously measuring based on wireless telecommunications |
| CN110208665A (en) * | 2019-07-05 | 2019-09-06 | 杭州西湖电子研究所 | A kind of detection method of wide area with respect to dielectric loss |
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