CN201583601U - High-low voltage comprehensive phase sequence and phase position instrument - Google Patents
High-low voltage comprehensive phase sequence and phase position instrument Download PDFInfo
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- CN201583601U CN201583601U CN 200920353515 CN200920353515U CN201583601U CN 201583601 U CN201583601 U CN 201583601U CN 200920353515 CN200920353515 CN 200920353515 CN 200920353515 U CN200920353515 U CN 200920353515U CN 201583601 U CN201583601 U CN 201583601U
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Abstract
The utility model relates to a high-low voltage comprehensive phase sequence and phase position instrument, which comprises two emitters and receivers in wireless connection with the emitters, wherein each emitter comprises an A/D sampling circuit, a coding circuit and a wireless transmission module; the receiver comprises two wireless receive modules, a decoding circuit and two signal processing modules electrically connected with the output terminal of the decoding circuit, and a display circuit electrically connected with the output terminal of the signal processing module; the principle of a resistor voltage divider is adopted to perform the low-voltage phase fixing and checking operation, and when the high-voltage phase fixing and checking operation is performed, the induction principle is adopted in sampling; and the conversion on measurement is performed according to the high-low voltage occasions, so that a device not only can realize the judgment on the phase sequence of the single power circuit and the phase position of the double-power circuit under the low-voltage active circuit, but also can realize the judgment on the phase sequence of the single power circuit and the phase position of the double-power circuit under the high-voltage active circuit, thereby avoiding the disadvantage caused since more devices are used for measurement in a complex construction site, therefore, the utility model has higher value in market application.
Description
Technical field
The utility model relates to and is used for high-low pressure integrated phase-sequence phase meter that the three-phase power supply phase sequence phase place is checked in a kind of electric system.
Background technology
Along with industrial level and growth in the living standard, increase day by day with electric loading, in order to guarantee the reliable supply of daily electricity consumption, now a lot of adjacent electric power systems are closed the road supply, under the assurance situation that an electric power system (as transformer station) breaks down therein, another electric power system can continue as it voltage is provided.Three-phase power line with a transformer station is connected with the corresponding three-phase power line mutually of another transformer station specifically, but, before connecting, need carry out phase place mutually to the correspondence of the three-phase power line of both sides checks, promptly the corresponding A phase phase place with opposite side of a side A is consistent, and the corresponding B phase phase place with opposite side of a side B is consistent, and the corresponding C phase phase place with opposite side of a side C is consistent, close the road if respective lines phase phase place is inconsistent and connect, then cause short circuit accident easily.
Carry out the technological means that phase place checks at present and carried out the transition to the wireless phase checking method that extensively adopts now from direct phase checking method, filtering phase checking method.And wireless phase checking method wherein, at the low-voltage distribution wire trackside, be by checking the same side two-phase voltage difference, compare with the two-phase voltage difference of opposite side again and obtain, its basis for estimation is more coarse, thinks that the angular difference of two-way power supply in-phase end is promptly thought the same-phase power supply in 20 degree or 30 degree.Owing to be that difference compares, the phase place of the corresponding phase of two circuits be can not determine the phase differential angle, therefore, measurement result can not guarantee homophase fully.And above-mentioned measurement needs judge that to the phase sequence of single-side power circuit it needs to use another set of independent function instrument to carry out again earlier in earlier stage.Therefore, under the site environment of complexity, operation is extremely inconvenience also.
The utility model content
The utility model purpose is exactly provide in order to overcome above-mentioned deficiency a kind of can be under the state of circuit charging operation, accurately judges the device of the phase place of the phase sequence of high pressure or low pressure single supply circuit and dual power supply circuit by the connection of active circuit.
In order to achieve the above object, the technical scheme that the utility model adopted is: a kind of high-low pressure integrated phase-sequence phase meter, it comprise two transmitters, with the receiver of described transmitter wireless connections, each described transmitter comprises A/D sample circuit, coding circuit, the wireless transmitter module that is electrically connected successively, and described receiver comprises wireless receiving module that two-way is electrically connected mutually successively, decoding circuit, the signal processing module that is electrically connected with described two-way decoding circuit output terminal, the display circuit that is connected with described signal processing module output terminal;
When the phase sequence of carrying out low pressure single supply circuit is judged, a described transmitter is connected with arbitrary power cable mutually by a divider resistance, divider resistance other end ground connection, on divider resistance, there is electric current to produce, the information of voltage of the corresponding phase power cable that described transmitter will be gathered from divider resistance is launched, and described receiver carries out calculation process to the information that receives and corresponding phase sequence is shown; When the phase place of carrying out the low-voltage dual power circuit is judged, described two transmitters are connected with the same cable mutually of respective side power circuit by divider resistance respectively, two divider resistance other end ground connection, on divider resistance, there is electric current to produce respectively, the information of voltage of the corresponding phase power cable that described two transmitters will be gathered from corresponding divider resistance is launched, and receiver carries out calculation process with the phase place of judging two-phase unanimity whether to the two-way information that receives;
When the phase sequence of carrying out high pressure single supply circuit is judged, one end of one of them transmitter is connected with arbitrary high pressure phase power cable, described transmitter produces coupling capacitance mutually with this between high voltage cable, described A/D sample circuit is gathered the voltage signal on the coupling capacitance and is exported coding circuit to, voltage signal after encoded is launched by wireless transmitter module, and described receiver carries out calculation process to the information that receives and corresponding phase sequence is shown; When the phase place of carrying out the high-voltage dual power circuit is judged, described two transmitters are connected with the same cable mutually of respective side power circuit respectively, between transmitter and the high voltage cable that is connected, produce coupling capacitance respectively, described transmitter is launched after gathering information of voltage on the corresponding coupling capacitance and encoded circuit code respectively, and receiver carries out calculation process with the phase place of judging two-phase unanimity whether to the two-way information that receives.
For the interference to electric field, magnetic field further shields, be coated with one or more layers shielding copper material the wiring board external seal of described transmitter.
Be filled with insulating material between the described multilayer screen copper material.
Described receiver is the hand-held receiver, and structure is small and exquisite, is convenient to operation.
Because the utilization of technique scheme, the utility model has following technological merit: the utility model high-low pressure integrated phase-sequence phase meter is when hanging down the compression set nuclear phase, adopt the direct voltage divider principle of resistance to realize, and when carrying out high compression set nuclear phase, principle of induction is adopted in sampling, when measuring, the conversion of measuring according to the high-low pressure occasion, thereby make an equipment both can realize the phase sequence of low-voltage active circuit single supply circuit and the phase place judgement of dual power supply circuit, can realize that also the phase place of single supply circuit phase sequence under the active circuit of high pressure and dual power supply circuit judges, avoided the drawback of using more device measuring to bring in the working-yard of complexity, and the utility model phase place phase sequence meter is communicated by letter by radio signal, usable range can expand to nearly 20 meters, and can pass enclosure wall and dividing plate and use, use simpler than voltage table or wired phasing tester.Simultaneously it adopts that the mode of digital signal processing makes the measuring accuracy of this phase-sequence phase meter higher, antijamming capability strong, stable performance, carrying out measurement result by display circuit shows, more directly perceived, be adapted at using under 10 ~ 110kV voltage levels, also be adapted at using under 30 ~ 400V low pressure situation.Therefore, has bigger market using value.
Description of drawings
Accompanying drawing 2 is the utility model high-low pressure integrated phase-sequence phase meter theory diagram under low pressure;
Accompanying drawing 3 is used synoptic diagram for the utility model high-low pressure integrated phase-sequence phase meter under high-tension line;
Accompanying drawing 4 is the utility model high-low pressure integrated phase-sequence phase meter theory diagram under high pressure;
Accompanying drawing 5 is the transmitter line plate shielding construction synoptic diagram of the utility model high-low pressure integrated phase-sequence phase meter;
Accompanying drawing 6 carries out the process flow diagram of Phase Processing for the receiver of the utility model high-low pressure integrated phase-sequence phase meter;
Wherein: 1, transmitter; 11, divider resistance; 101, coupling capacitance; 12, A/D sample circuit; 13, coding circuit; 14, wireless transmitter module; 15, filtering circuit;
1 ', transmitter; 11 ', divider resistance; 101 ', coupling capacitance; 12 ', A/D sample circuit; 13 ', coding circuit; 14 ', wireless transmitter module; 15 ', filtering circuit;
2, receiver; 21, wireless receiving module; 21 ', wireless receiving module; 22, decoding circuit; 22 ', decoding circuit; 23, signal processing module; 24, display circuit;
3, shielding copper material; 4, insulating material;
Embodiment
Below in conjunction with accompanying drawing preferred forms of the present utility model is made a presentation:
The utility model high-low pressure integrated phase-sequence phase meter can be implemented under the state of the normal operation of circuit, and the phase sequence of low pressure or high pressure single supply circuit is judged, can whether correspondence is judged to the phase place of low pressure or high-voltage dual power circuit.To low pressure single supply nuclear phase preface or dual power supply nuclear phase position the time, mode by electric resistance partial pressure connects divider resistance on a phase cable, the other end ground connection of divider resistance, thereby on divider resistance, there is electric current to pass through, existing voltage produces on divider resistance, thereby by gathering the voltage on the divider resistance and carrying out the analysis realization phase sequence of voltage phase sequence and phase place or the judgement of phase place; To high pressure univoltage nuclear phase preface or dual power supply nuclear phase position the time, adopt the principle of radio coupling, i.e. change meeting by electric field strong and weak in the conductor produces the low-potential voltage signal on the capacitive divider of instrument and shielding and the earth composition.Equally, go out by gathering this voltage signal and transforming modulation back wireless transmit accordingly,, by demodulation information is extracted from change in voltage again when receiving end receives emission information by electric wave, by signal is carried out algorithm process, realize deciding the nuclear phase function.
By above-mentioned analysis as can be seen, judgement to the phase-sequence phase of low pressure or high-voltage power supply circuit, collection and processing mode can be shared, therefore, in the utility model, the high-low pressure integrated phase-sequence phase meter mainly is made up of two transmitters and a hand-held receiver, the theory structure of two transmitters is identical, as Fig. 2 and shown in Figure 4, particularly, transmitter 1 comprises the A/D sample circuit 12 that is electrically connected successively, coding circuit 13, wireless transmitter module 14, the physical circuit of each functional module can be selected known circuit according to concrete service condition, at this each physical circuit is repeated no more.Transmitter 1 ' comprises A/D sample circuit 12 ', coding circuit 13 ', the wireless transmitter module 14 ' that is electrically connected successively, equally, the physical circuit of above-mentioned each functional module can be selected known circuit according to concrete service condition, at this each physical circuit is repeated no more.
Owing to appraise and decide in the phase process at the scene, undesired signal has multiple, and source and approach also have nothing in common with each other.As flow directly into the corona signal of power equipment by circuit; the electric field of neighbouring device, bus etc. disturbs; office's discharge signal of other power equipment inside; the silicon rectifier signal; the carrier current protection of electric system inside and carrier communication signal; and the broadcast communication signal outside the system; therefore; before transmitter 1,1 ' coding circuit 13,13 ' carry out respective coding; also adding has filtering circuit 15,15 ', filtering circuit 15,15 ' can adopt the digital filter that high frequency hardware filtering device reaches or software is realized to realize.
Above-mentioned functional module to the utility model high-low pressure integrated phase-sequence phase meter is introduced, to describe its course of work below, because its measuring object difference of this complete equipment, the sampling principle of transmitter are slightly different, will illustrate respectively two kinds of different applied environments below:
(1), to the phase sequence of low pressure single supply circuit and the phase-detection of low-voltage dual power circuit:
As shown in Figure 1, when needs detect each phase sequence of one road single supply circuit wherein, need be by a divider resistance, with an end of divider resistance with one mutually cable be connected, the other end ground connection of divider resistance, as in Fig. 1, divider resistance is arranged on the transmitter 1, transmitter 1 ground connection is got final product, thereby, under the power supply normal operating condition, form path between this phase cable and the divider resistance, as shown in Figure 2, there is electric current to pass through in the divider resistance 11, thereby the other end at divider resistance 11 has voltage to produce, output after 12 pairs of voltage signals of the A/D sample circuit of transmitter 1 are sampled, wave circuit 15 filtering interference signals after filtration, the coding that voltage signal after 13 pairs of conversions of coding circuit is suitable for launching, launch by wireless transmitter module 14, wireless receiving module 21 wireless receivings of receiver 2 are behind the signal of transmitter 1 emission, input to signal processing module 23 through decoding circuit 22 decoded signals, signal processing module 23 compares received signal and reference signal, as to preestablish reference signal be that the phasing degree is the sine wave of zero degree, and this reference signal is the A phase, when the contrast of received signal and reference signal, both match by waveform so, then can judge be connected with transmitter be A mutually; If the contrast of received signal and reference signal, both waveforms be lag or lead 120 degree on phase place, then can judge be connected with transmitter be B mutually; If received signal and reference signal contrast, both waveforms are lag or lead 240 degree on phase place, then can judge be connected with transmitter for C mutually, after the phase sequence of one phase of single supply circuit to be determined, transmitter 1 is disconnected and this connection mutually, and cable is continuous mutually with another with it simultaneously, judges the phase sequence of this cable in the manner described above again, after the phase sequence of two-phase cable judged, the phase sequence of another cable also naturally must cicada.
When needs carry out the nuclear phase judgement of low-voltage dual power circuit, each phase sequence with two single supply circuits judges at first in a manner mentioned above, then with the A of transmitter 1 and the first via mutually cable be connected, with transmitter 1 ' and the second tunnel A mutually cable be connected, while two transmitters 1,1 ' ground connection, thereby on the divider resistance that joins between corresponding cable and the earth 11,11 ', there is electric current to flow through respectively, like this, launch behind the two-way voltage signal coding that transmitter 1,1 ' will be gathered respectively.Receiver 2 receives above-mentioned two paths of signals, and after corresponding decoding, decoding circuit 22,22 ' together is sent to signal processing module 23 with corresponding signal, and the signal of 23 pairs of receptions of signal processing module carries out the judgement of phase place, specifically deterministic process following (shown in Figure 6):
The maximum deviation threshold value of two signals of at first default homophase, this threshold value can be empirical value, then with one of two received signal as reference signal, another is signal as a comparison, as establishes transmitting of transmitter 1 and be reference signal, and transmitting of transmitter 1 ' is comparison signal, comparison signal and reference signal are carried out the similarity contrast, if both similarities less than threshold value, are then judged two phase signals homophases, and output shows;
If both similarities are greater than threshold value, comparison signal is shifted, and in the present embodiment, the angle of displacement can be 1 degree at every turn, continue relatively two waveform signals the displacement back, comparison signal after being shifted through one or many and reference signal similarity finish relatively less than threshold value, and output shows the number of degrees that are shifted, until both similarities less than threshold value, finish relatively, output shows the number of degrees of displacement, is the phase phasic difference number of degrees of dual power supply circuit homophase.Need to prove that similarity can be set at absolute value as required, the number of degrees that differ so also should be positive number; Also can be actual specific than numerical value, as being positioned at reference signal starting point left side when quilt than start point signal, similarity should be negative, if be positioned at reference signal starting point right side than start point signal, similarity should be positive number, and display circuit can carry out positive negative value and show, thereby more directly perceived to the judgement of both phase places.
Two-way B phase, C to homophase can carry out the phase place judgement mutually equally according to the method described above.
Because above-mentioned sampling produces by electric resistance partial pressure, precision is higher, does not almost have phase error, and therefore, measurement result is more accurate.
Operation for convenience can be gone up a fixedly connected metal hanger at each transmitter 1,1 ', during measurement, promptly realizes on the corresponding circuit that by metal hanger is hung over transmitter is connected with the active of circuit.
Above-mentionedly make referrals to,, in transmitter, adopt filtering circuit to carry out the filtering of undesired signal,, can carry out electric field, magnetic field shielding a whole set of instrument system in order to suppress undesired signal from the source in order to eliminate undesired signal.Particularly, for the shielding that electric field disturbs,, therefore adopt copper material with high conductivity mainly by reflection loss.Test shows that its shield effectiveness can reach more than the 120dB in very wide frequency domain scope.Interference then adopts the ferromagnetic material of high magnetic permeability, low conductivity to shield to power frequency magnetic field.(power frequency is main at the concrete characteristics of electric system electromagnetic interference (EMI), high-frequency range is wide), on the transmitter of high-low pressure integrated phase-sequence phase meter of the present utility model, adopt the multilayer screen structure, as shown in Figure 5, its center is for realizing the printed panel of transmitter function, be covered with two-layer copper material screen layer 3 in its external packets, between two-layer screen layer 3, be filled with insulating material 4, thereby reach shield effectiveness preferably.
(2), to the phase sequence of high pressure single supply circuit and the phase-detection of high-voltage dual power circuit:
Substantially detect identical with low pressure to the phase sequence of high pressure single supply circuit and the phase-detection mode of high-voltage dual power circuit, different is, in the detection of high-voltage power supply circuit, need be by divider resistance, only need transmitter is directly got final product with corresponding cable mutually is continuous, this is because under the electric field that high voltage cable produces, instrument will produce coupling capacitance with being connected of cable, this coupling capacitance and the earth are formed capacitive divider, thereby generation voltage signal, as shown in Figure 3, when needs detect each phase sequence of one road single supply circuit wherein, to a wherein transmitter, as transmitter 1 one ends with one mutually cable contact, under the power supply normal operating condition, shown in Figure 4, be formed with coupling capacitance 101 between this phase cable and the transmitter 1, thereby on coupling capacitance 101, there is voltage to produce, output after 12 pairs of voltage signals of A/D sample circuit are sampled, wave circuit 15 filtering interference signals after filtration, the coding that voltage signal after 13 pairs of conversions of coding circuit is suitable for launching, launch by wireless transmitter module 14, thereby the processing that the signal of 2 pairs of receptions of receiver carries out obtains the phase sequence of this phase cable, its calculating process is handled identical with the phase sequence of low pressure single supply circuit, do not repeat them here
When needs carry out the nuclear phase judgement of high-voltage dual power circuit, each phase sequence with two single supply circuits judges at first in a manner mentioned above, then with the A of transmitter 1 and the first via mutually cable be connected, with transmitter 1 ' and the second tunnel A mutually cable be connected, each transmitter 1,1 ' and corresponding cable between produce coupling capacitance 11,11 ' respectively, launch behind transmitter 1, the 1 ' coupling capacitance that will gather respectively, the 11 two-way voltage signals coding.Receiver 2 receives above-mentioned two paths of signals, after corresponding decoding, decoding circuit 22,22 ' together is sent to signal processing module 23 with corresponding signal, and the signal of 23 pairs of receptions of signal processing module carries out the judgement of phase place, thereby whether draw two-phase cable phase place consistent.Concrete determining step is judged with the phase place of low-voltage dual power circuit, is not repeated them here.
When carrying out high compression set nuclear phase, principle of induction is adopted in sampling, considers insulating requirements, and the sampling transmitter can not be contacted directly with earth potential.
The utility model high-low pressure integrated phase-sequence phase meter, can be under the state of circuit charging operation, by wireless sampling, accurately judge the phase sequence (positive sequence or negative phase-sequence) of low pressure or high pressure single supply circuit, the dual power supply circuit that is about to paired running is judged accurately whether phase place is corresponding.It can be widely used in the electric system, all can use at high pressure or low pressure occasion, therefore, has bigger application value.
Claims (6)
1. high-low pressure integrated phase-sequence phase meter, it is characterized in that: it comprises two transmitters (1,1 '), with described transmitter (1,1 ') receiver of wireless connections (2), each described transmitter (1,1 ') comprise the A/D sample circuit (12 that is electrically connected successively, 12 '), coding circuit (13,13 '), wireless transmitter module (14,14 '), described receiver (2) comprises the wireless receiving module (21 that two-way is electrically connected mutually successively, 21 '), decoding circuit (22,22 '), with described two-way decoding circuit (22,22 ') signal processing module (23) that is electrically connected of output terminal, the display circuit (24) that is connected with described signal processing module (23) output terminal;
When the phase sequence of carrying out low pressure single supply circuit is judged, a described transmitter (1) is connected with arbitrary power cable mutually by a divider resistance (11), divider resistance (11) other end ground connection, on divider resistance (11), there is electric current to produce, the information of voltage of the corresponding phase power cable that described transmitter (1) will be gathered from divider resistance (11) is launched, and described receiver (2) carries out calculation process to the information that receives and corresponding phase sequence is shown; When the phase place of carrying out the low-voltage dual power circuit is judged, described two transmitters (1,1 ') are connected with the same cable mutually of respective side power circuit by divider resistance (11,11 ') respectively, two divider resistances (11,11 ') other end ground connection, on divider resistance (11,11 '), there is electric current to produce respectively, the information of voltage of the corresponding phase power cable that described two transmitters (1,1 ') will be gathered from corresponding divider resistance (11,11 ') is launched, and receiver (2) carries out calculation process with the phase place of judging two-phase unanimity whether to the two-way information that receives;
When the phase sequence of carrying out high pressure single supply circuit is judged, one end of one of them transmitter (1) is connected with arbitrary high pressure phase power cable, described transmitter (1) produces coupling capacitance (101) mutually with this between high voltage cable, described A/D sample circuit (12) is gathered the voltage signal on the coupling capacitance (101) and is exported coding circuit (13) to, voltage signal after encoded is launched by wireless transmitter module (14), and described receiver (2) carries out calculation process to the information that receives and corresponding phase sequence is shown; When the phase place of carrying out the high-voltage dual power circuit is judged, described two transmitters (1,1 ') are connected with the same cable mutually of respective side power circuit respectively, between transmitter (1,1 ') and the high voltage cable that is connected, produce coupling capacitance (101,101 ') respectively, described transmitter (1,1 ') is launched after gathering information of voltage on the corresponding coupling capacitance (101,101 ') and encoded circuit (13,13 ') coding respectively, and receiver (2) carries out calculation process with the phase place of judging two-phase unanimity whether to the two-way information that receives.
2. high-low pressure integrated phase-sequence phase meter according to claim 1, it is characterized in that: also be provided with filtering circuit (15,15 ') between the A/D sample circuit (12,12 ') of described transmitter (1,1 ') and the coding circuit (12,12 '), described filtering circuit (15,15 ') is used for filtering interference signals before coding.
3. high-low pressure integrated phase-sequence phase meter according to claim 1 and 2 is characterized in that: be coated with one or more layers shielding copper material (3) the wiring board external seal of described transmitter (1,1 ').
4. high-low pressure integrated phase-sequence phase meter according to claim 3 is characterized in that: be filled with insulating material (4) between the described multilayer screen copper material (3).
5. according to claim 1 or 2 or 4 described high-low pressure integrated phase-sequence phase meters, its feature again with: described transmitter (1,1 ') front end has the metal hanger that is used to be articulated on the cable.
6. according to claim 1 or 2 or 4 described high-low pressure integrated phase-sequence phase meters, it is characterized in that: described receiver (2) is the hand-held receiver.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200920353515 CN201583601U (en) | 2009-12-28 | 2009-12-28 | High-low voltage comprehensive phase sequence and phase position instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920353515 CN201583601U (en) | 2009-12-28 | 2009-12-28 | High-low voltage comprehensive phase sequence and phase position instrument |
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| CN201583601U true CN201583601U (en) | 2010-09-15 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788614B (en) * | 2009-12-28 | 2012-07-25 | 江苏省电力公司苏州供电公司 | High and low voltage integrated phase-sequence phase meter and detection method thereof |
| CN102854404A (en) * | 2012-08-31 | 2013-01-02 | 南车株洲电力机车研究所有限公司 | Method and controller for judging phase sequence of synchronizing signal in main circuit of converter |
| CN103308784A (en) * | 2012-03-15 | 2013-09-18 | 辽宁省电力有限公司大连供电公司 | Nuclear phase instrument |
| CN110221132A (en) * | 2019-06-18 | 2019-09-10 | 国网冀北电力有限公司廊坊供电公司 | The method and nuclear phase instrument new application of electrification investigation high-tension apparatus phase shortage |
| CN110221133A (en) * | 2019-06-17 | 2019-09-10 | 国网湖南省电力有限公司 | A kind of quick phasing adjustement of electric system high-tension line and its application method |
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2009
- 2009-12-28 CN CN 200920353515 patent/CN201583601U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788614B (en) * | 2009-12-28 | 2012-07-25 | 江苏省电力公司苏州供电公司 | High and low voltage integrated phase-sequence phase meter and detection method thereof |
| CN103308784A (en) * | 2012-03-15 | 2013-09-18 | 辽宁省电力有限公司大连供电公司 | Nuclear phase instrument |
| CN103308784B (en) * | 2012-03-15 | 2016-03-30 | 国网辽宁省电力有限公司大连供电公司 | A kind of nuclear phase instrument |
| CN102854404A (en) * | 2012-08-31 | 2013-01-02 | 南车株洲电力机车研究所有限公司 | Method and controller for judging phase sequence of synchronizing signal in main circuit of converter |
| CN102854404B (en) * | 2012-08-31 | 2015-02-25 | 南车株洲电力机车研究所有限公司 | Method and controller for judging phase sequence of synchronizing signal in main circuit of converter |
| CN110221133A (en) * | 2019-06-17 | 2019-09-10 | 国网湖南省电力有限公司 | A kind of quick phasing adjustement of electric system high-tension line and its application method |
| CN110221132A (en) * | 2019-06-18 | 2019-09-10 | 国网冀北电力有限公司廊坊供电公司 | The method and nuclear phase instrument new application of electrification investigation high-tension apparatus phase shortage |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100915 Effective date of abandoning: 20091228 |