CN201583602U - Low-voltage phase sequence phase meter - Google Patents
Low-voltage phase sequence phase meter Download PDFInfo
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- CN201583602U CN201583602U CN 200920353555 CN200920353555U CN201583602U CN 201583602 U CN201583602 U CN 201583602U CN 200920353555 CN200920353555 CN 200920353555 CN 200920353555 U CN200920353555 U CN 200920353555U CN 201583602 U CN201583602 U CN 201583602U
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Abstract
The utility model relates to a low-voltage phase sequence phase meter which comprises two transmitters and a receiver wirelessly connected with the transmitters. Each transmitter comprises a voltage grading resistor, an A/D sampling circuit, a coding circuit and a wireless transmitting module, wherein the receiver comprises two wireless receiver modules, two decoding circuits, a signal processing module electrically connected with the output terminals of the two decoding circuits, and a display circuit connected with the output terminal of the signal processing module; one end of the voltage grading resistor of the transmitter is connected with a circuit to be tested and the other end of the voltage grading resistor is grounded when the running of a power system is normal, therefore, a loop is formed between the circuit and the transmitters, and the receiver processes received voltage signals, therefore, the phase sequence of a single power source circuit can be judged; and by connecting the two transmitters and the identical phase cables of the single power source circuit on two sides, the phase sequence of a double power source circuit can be judged, thus ensuring that the phases of the power sources on the two sides can be matched, and the low-voltage phase sequence phase meter is suitable for being used in 30-400V low-voltage condition.
Description
Technical field
The utility model relates to and is used for the low-voltage phase-sequence phasemeter under 30～400V low pressure situation the three-phase supply phase place 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, owing to be that difference compares, phase place to the corresponding phase of two circuits be can not determine the phase differential angle, and 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 and the detection method thereof of the phase place of the phase sequence of 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 low-voltage phase-sequence phasemeter, it comprise two transmitters, with the receiver of described transmitter wireless connections, each described transmitter comprises divider resistance, 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 the single supply circuit is judged, divider resistance one end of one of them transmitter other end ground connection that is connected with arbitrary power circuit mutually, form path between the divider resistance of described transmitter, A/D sample circuit, coding circuit and the wireless transmitter module, the information of voltage of the corresponding phase power circuit 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 dual power supply circuit is judged, one end of the divider resistance of described two transmitters is connected with the same cable mutually of respective side power circuit respectively, the other end of divider resistance is ground connection respectively, two transmitters are correspondingly launched the information that collects, and receiver carries out calculation process with the phase place of judging two-phase unanimity whether to the two-way information that receives.
Further, also be provided with filtering circuit between the A/D sample circuit of described transmitter and the coding circuit, described filtering circuit is used for filtering interference signals before coding.
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 phase-sequence phase meter is under the state of the normal operation of electric system, with divider resistance one end of the transmitter other end ground connection that is connected with circuit to be measured, thereby between circuit and transmitter, form path, voltage signal on the divider resistance that receiver reception transmitter sends, thereby voltage signal is handled and can be carried out the phase sequence judgement to the single supply circuit, the dual power supply circuit is carried out phase place to be judged, mutually whether consistent each provide reference for the dual power supply circuit, to guarantee whether the both sides power supply can close phase, because charged to carry out that phase place checks be that the important prerequisite foundation that the method for operation is adjusted is carried out in electric system, the utility model phase place phase sequence meter has been realized the judgement to phase sequence and phase place simultaneously, the equipment small volume and less weight of making, being convenient to operator safety detects, it comes communication 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.And it adopts, and the mode of digital signal processing makes the measuring accuracy of this phase-sequence phase meter higher, antijamming capability strong, stable performance, carries out measurement result by display circuit and shows, and is more directly perceived, therefore, has bigger market using value.
Description of drawings
Accompanying drawing 4 carries out the process flow diagram of Phase Processing for the receiver of the utility model low-voltage phase-sequence phasemeter;
Wherein: 1, transmitter; 11, divider resistance; 12, A/D sample circuit; 13, coding circuit 14, wireless transmitter module 15, filtering circuit;
1 ', transmitter; 11 ', divider resistance; 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:
Low-voltage phase-sequence phasemeter as shown in Figure 2, mainly comprise a transmitter and a hand-held receiver, wherein, transmitter is two, and the theory structure of two transmitters is identical, particularly, transmitter 1 comprises divider resistance 11, A/D sample circuit 12, coding circuit 13, the wireless transmitter module 14 that is electrically connected successively, in use, and by the voltage signal on the A/D sample circuit 12 collection divider resistances 11, the encoded circuit 13 of this voltage signal is encoded, and is launched by wireless transmitter module 14 at last.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 divider resistance 11 ', A/D sample circuit 12 ', coding circuit 13 ', the wireless transmitter module 14 ' that is electrically connected successively, in use, by the voltage signal on A/D sample circuit 12 ' the collection divider resistance 11 ', the encoded circuit 13 ' of this voltage signal is encoded, and is launched by wireless transmitter module 14 ' at last.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 low-voltage phase-sequence phasemeter is introduced, and will be described as follows its course of work below:
As shown in Figure 1, when needs detect each phase sequence of one road single supply circuit wherein, to a wherein transmitter, as divider resistance 11 1 ends of transmitter 1 with one mutually cable contact, the other end ground connection of divider resistance 11, thereby, under the power supply normal operating condition, form path between this phase cable and the transmitter 1, 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 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, 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 dual power supply 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 each transmitter 1,1 ' divider resistance 11,11 ', there is electric current to flow through respectively, like this, launches 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 4):
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 during measurement, promptly realize on the corresponding circuit that by metal hanger is hung over transmitter is connected with the active of circuit at each transmitter 1,1 ' the fixedly connected metal hanger of resistance link.
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 phase-sequence phase meter of the present utility model, adopt the multilayer screen structure, as shown in Figure 3, 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.
To sum up, the utility model phase-sequence phase meter can be widely used in the electric system, and it can carry out accurate sequencing and accurately check power phase, is particluarly suitable for using under 30 ~ 400V low pressure situation.
Claims (6)
1. low-voltage phase-sequence phasemeter, 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 divider resistance (11 that is electrically connected successively, 11 '), A/D sample circuit (12,12 '), 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 the single supply circuit is judged, divider resistance (11) one ends of one of them transmitter (1) other end ground connection that is connected with arbitrary power circuit mutually, form path between the divider resistance (11) of described transmitter (1), A/D sample circuit (12), coding circuit (13) and the wireless transmitter module (14), the information of voltage of the corresponding phase power circuit 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 dual power supply circuit is judged, one end of the divider resistance (11,11 ') of described two transmitters (1,1 ') is connected with the same cable mutually of respective side power circuit respectively, the other end of divider resistance (11,11 ') is ground connection respectively, two transmitters (1,1 ') are correspondingly launched the information that collects, 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. low-voltage phase-sequence phasemeter 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. low-voltage phase-sequence phasemeter 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. low-voltage phase-sequence phasemeter 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 low-voltage phase-sequence phasemeters, 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 low-voltage phase-sequence phasemeters, it is characterized in that: described receiver (2) is the hand-held receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920353555 CN201583602U (en) | 2009-12-28 | 2009-12-28 | Low-voltage phase sequence phase meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920353555 CN201583602U (en) | 2009-12-28 | 2009-12-28 | Low-voltage phase sequence phase meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201583602U true CN201583602U (en) | 2010-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200920353555 Expired - Lifetime CN201583602U (en) | 2009-12-28 | 2009-12-28 | Low-voltage phase sequence phase meter |
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| Country | Link |
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| CN (1) | CN201583602U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788607B (en) * | 2009-12-28 | 2011-12-28 | 江苏省电力公司苏州供电公司 | Low-voltage phase-sequence phasemeter and detection method thereof |
| CN104569629A (en) * | 2015-02-03 | 2015-04-29 | 孙超 | Phase sequence tester of low-voltage cables |
-
2009
- 2009-12-28 CN CN 200920353555 patent/CN201583602U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788607B (en) * | 2009-12-28 | 2011-12-28 | 江苏省电力公司苏州供电公司 | Low-voltage phase-sequence phasemeter and detection method thereof |
| CN104569629A (en) * | 2015-02-03 | 2015-04-29 | 孙超 | Phase sequence tester of low-voltage cables |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100915 Effective date of abandoning: 20091228 |