CN110954756A - Phase discrimination method and device for three-phase cable - Google Patents
Phase discrimination method and device for three-phase cable Download PDFInfo
- Publication number
- CN110954756A CN110954756A CN201911328452.1A CN201911328452A CN110954756A CN 110954756 A CN110954756 A CN 110954756A CN 201911328452 A CN201911328452 A CN 201911328452A CN 110954756 A CN110954756 A CN 110954756A
- Authority
- CN
- China
- Prior art keywords
- phase
- cable
- cables
- measured
- resistance value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/18—Indicating phase sequence; Indicating synchronism
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/04—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant in circuits having distributed constants, e.g. having very long conductors or involving high frequencies
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a phase discrimination method for a three-phase cable, which is characterized in that a plurality of identification resistors are connected to the starting end of the three-phase cable, so that the starting end resistance values of any two cables are different; and measuring the resistance value of the end to be measured between any two cables of the end to be measured of the three-phase cable, comparing the resistance value of the end to be measured with the resistance value of the starting end, and determining the phase corresponding to each cable of the end to be measured through the phase of the cable corresponding to the resistance value of the starting end and the resistance value of the starting end. The identification resistor is additionally hung between the cables of the initial end of each cable phase which is known clearly, so that the resistance between every two cables is different, and then the resistance between the cables with unknown phase sequence is measured and compared with the previously measured resistance value to obtain the cable phase.
Description
Technical Field
The invention relates to the field of electrical detection, in particular to a phase discrimination method and a phase discrimination device for a three-phase cable.
Background
Three-phase alternating current is a form of delivery of electrical energy, referred to as three-phase power for short. The three-phase AC power supply consists of three AC potentials with the same frequency, equal amplitude and phase difference of 120 deg. Three-phase alternating current has many advantages. In terms of power generation equipment, a three-phase alternator has a higher output power than a single-phase alternator of the same size; in the aspect of power transmission, the three-phase power supply system also saves materials compared with the single-phase power supply system; in terms of electricity consumption, a three-phase ac motor widely used in production has advantages of superior performance, simple structure, low price, and the like, compared with a dc motor and other types of ac motors. Therefore, the alternating current produced, transmitted and distributed by power plants and power grids in China is three-phase alternating current. This also introduces the problem of phase discrimination of the three-phase cable associated with the three-phase ac phase sequence.
The existing three-phase power is used in various scenes, so that the environment of a three-phase cable body is complex and changeable, marks used for marking each phase on the surface of a cable are prone to abrasion in use all the year round, the problems of illegal replacement of operators and the like, and the marks can not be used as the basis for judging the phase sequence of each line any more, so that a large amount of work of testing the on-off of the cable and identifying the phase sequence of the cable exists in the construction process of electrical engineering. Therefore, how to solve the problems that the phase discrimination step of the existing three-phase cable is complicated, the communication cost of a plurality of working personnel is high, and the accuracy rate is low is a problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
The invention aims to provide a phase discrimination method and a phase discrimination device for a three-phase cable, which aim to solve the problems of high communication cost, complex steps and low accuracy of a plurality of workers in the phase sequence discrimination of the three-phase cable in the prior art.
In order to solve the technical problem, the invention provides a phase discrimination method for a three-phase cable, which comprises the following steps:
a plurality of identification resistors are connected to the starting end of the three-phase cable, so that the starting end resistance values between any two cables are different;
and measuring the resistance value of the end to be measured between any two cables of the end to be measured of the three-phase cable, comparing the resistance value of the end to be measured with the resistance value of the starting end, and determining the phase corresponding to each cable of the end to be measured according to the phase of the cable corresponding to the resistance value of the starting end and the resistance value of the starting end.
Optionally, in the phase detecting method for a three-phase cable, the switching in a plurality of identifying resistors at the starting end of the three-phase cable so that the starting end resistance values between any two cables are different includes:
and respectively connecting the first identification resistor and the second identification resistor between the two cables at the starting end of the three-phase cable.
Optionally, in the three-phase cable phase detection method, the first identification resistor is connected between a first cable and a second cable;
and connecting the second identification resistor between the second cable and the third cable.
The invention also provides a phase discrimination device for the three-phase cable, which comprises a plurality of identification resistors and wire connectors;
the wire connector is used for connecting the identification resistor to the starting end of the three-phase cable, so that the resistance values between any two cables are different.
Optionally, in the three-phase cable phase detection device, the three-phase cable phase detection device includes a first identifying resistor and a second identifying resistor.
Optionally, in the three-phase cable phase detection device, the resistance values of the first identifying resistor and the second identifying resistor range from 10 Ω to 10M Ω, inclusive.
Optionally, in the three-phase cable phase detection device, the wire connector is an alligator clip.
According to the phase discrimination method for the three-phase cable, the starting end of the three-phase cable is connected with a plurality of identification resistors, so that the starting end resistance values of any two cables are different; and measuring the resistance value of the end to be measured between any two cables of the end to be measured of the three-phase cable, comparing the resistance value of the end to be measured with the resistance value of the starting end, and determining the phase corresponding to each cable of the end to be measured according to the phase of the cable corresponding to the resistance value of the starting end and the resistance value of the starting end. The identification resistors are additionally hung between the cables of the initial ends of the phases of the cables, so that the resistances between every two cables are different, and then the resistance between the cables with unknown phase sequences is measured at the end to be measured and is compared with the resistance value of the initial end measured before, so that the phases of the cables can be obtained in a one-to-one correspondence mode. The invention also provides a three-phase cable phase discrimination device with the beneficial effects.
Drawings
It should be noted that the cable at the start end is not substantially damaged, so that the phase of each cable can be easily determined according to the identification or the connection condition with the equipment.
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a specific embodiment of a phase discrimination method for a three-phase cable according to the present invention;
fig. 2 is a schematic flow chart of another embodiment of a phase discrimination method for a three-phase cable according to the present invention;
fig. 3 is a schematic structural diagram of a specific embodiment of a three-phase cable phase detection device provided in the present invention;
fig. 4 is a schematic circuit diagram of a specific embodiment of a three-phase cable phase detection apparatus according to the present invention.
Detailed Description
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the invention is to provide a phase discrimination method for a three-phase cable, wherein the flow diagram of one specific embodiment is shown in fig. 1, which is called as the first specific embodiment and comprises the following steps:
step S101: and a plurality of identification resistors are connected to the starting end of the three-phase cable, so that the starting end resistance values between any two cables are different.
The identification resistor can be a plurality of identification resistors, for example, one identification resistor is mounted between the A phase and the B phase, one identification resistor is mounted between the B phase and the C phase, and one identification resistor is mounted between the C phase and the A phase; a plurality of identification resistors may be mounted between the same two phases as long as the resistance value (i.e., the starting end resistance value) between any two cables is different.
Step S102: and measuring the resistance value of the end to be measured between any two cables of the end to be measured of the three-phase cable, comparing the resistance value of the end to be measured with the resistance value of the starting end, and determining the phase corresponding to each cable of the end to be measured according to the phase of the cable corresponding to the resistance value of the starting end and the resistance value of the starting end.
One method of determining the phase corresponding to each cable of the end to be measured is to measure the resistance between the cables at the end to be measured, and find two cables having the same resistance as the current resistance in the resistance value of the starting end, thereby determining the phase of the third cable. Further, for example, if a resistance of 1k Ω is connected between the a phase and the B phase at the start end, a resistance of 2k Ω is connected between the B phase and the C phase, and then a resistance of 1k Ω is measured between the first cable and the second cable at the end to be measured, then the first cable and the second cable may be determined to be the a phase cable and the B phase cable, but they cannot be in one-to-one correspondence, the only one that can be determined is the third cable at the end to be measured to be the C phase cable, and then only which line has a resistance of 2k Ω with the third cable needs to be determined, then the B phase cable may be determined, and then the only a phase cable may be determined. Referring to fig. 4, fig. 4 is a schematic circuit diagram of an embodiment of the present invention. Certainly, the cable itself also has a resistor, and the ohmmeter inevitably has an error, so the sizes of the different resistance values of the identification resistors in the invention are separated as much as possible, and an error should be allowed between the reading of the resistor at the end to be measured and the resistance value at the starting end.
According to the phase discrimination method for the three-phase cable, the starting end of the three-phase cable is connected with a plurality of identification resistors, so that the starting end resistance values of any two cables are different; and measuring the resistance value of the end to be measured between any two cables of the end to be measured of the three-phase cable, comparing the resistance value of the end to be measured with the resistance value of the starting end, and determining the phase corresponding to each cable of the end to be measured according to the phase of the cable corresponding to the resistance value of the starting end and the resistance value of the starting end. The identification resistors are additionally hung between the cables of the initial ends of the phases of the cables, so that the resistances between every two cables are different, and then the resistance between the cables with unknown phase sequences is measured at the end to be measured and is compared with the resistance value of the initial end measured before, so that the phases of the cables can be obtained in a one-to-one correspondence mode.
On the basis of the first specific embodiment, a second specific embodiment is obtained by further improving the access method of the identification resistor, and a flow diagram of the second specific embodiment is shown in fig. 2, and includes:
step S201: and respectively connecting the first identification resistor and the second identification resistor between the two cables at the starting end of the three-phase cable.
Step S202: and measuring the resistance value of the end to be measured between any two cables of the end to be measured of the three-phase cable, comparing the resistance value of the end to be measured with the resistance value of the starting end, and determining the phase corresponding to each cable of the end to be measured according to the phase of the cable corresponding to the resistance value of the starting end and the resistance value of the starting end.
The difference between this embodiment and the above embodiment is that this embodiment specifically defines the number and connection manner of the identification resistors, and the remaining steps are the same as those in the above embodiment, and are not described herein again.
In this embodiment, the identification resistors are limited to be only two, that is, the first identification resistor and the second identification resistor, and as long as it is ensured that the cables connected to the two ends of the two identification resistors are not identical, the resistance value between any two cables in the three cables is necessarily different on the premise that the resistance values of the first identification resistor and the second identification resistor are different.
The invention also provides a three-phase cable phase detection device, the structure schematic diagram of one specific embodiment of which is shown in fig. 3, which is called as a third specific embodiment, and comprises a plurality of identification resistors and wire connectors 300;
the connector 300 is used to connect the identification resistor to the start end of the three-phase cable, so that the resistance values between any two cables are different.
The phase discrimination method of the three-phase cable provided by the invention comprises a plurality of identifying resistors and wire connectors 300; the connector 300 is used to connect the identification resistor to the start end of the three-phase cable, so that the resistance values between any two cables are different. The identification resistors are additionally hung between the cables of the initial ends of the phases of the cables, so that the resistances between every two cables are different, and then the resistance between the cables with unknown phase sequences is measured at the end to be measured and is compared with the resistance value of the initial end measured before, so that the phases of the cables can be obtained in a one-to-one correspondence mode.
As a preferable scheme, the three-phase cable phase detection device includes a first identifying resistor 100 and a second identifying resistor 200;
the cables at both ends of the first identifying resistor 100 and the second identifying resistor 200 are not identical.
Specifically, the resistance values of the first identifying resistor 100 and the second identifying resistor 200 range from 10 Ω to 10M Ω, including an end point value, such as any one of 10.0 Ω, 500.0 Ω, or 10.0M Ω; the cables of the three-phase cable are generally copper wires, and the resistance of the three-phase cable usually does not exceed 1 Ω, so as long as the resistance between the two cables is ensured to be greater than 10 Ω, the ohmic meter can be used for reading the resistance value of the identification resistor at the end to be measured on the basis of eliminating the copper wire resistance.
It should be reminded that the difference between the resistance values of the first identifying resistor 100 and the second identifying resistor 200 is greater than 10 Ω, so as to avoid measurement errors caused by reading errors of the ohmmeter, and of course, the difference may be of other degrees as long as the first identifying resistor and the second identifying resistor can be distinguished.
It should be noted that the connector 300 is an alligator clip, which facilitates the connection and disconnection of the identification resistor to and from the three-wire cable.
Further, the phase detecting device for three-phase cables comprises an insulating housing having a through hole, and the connector 300 extends out of the insulating housing from the through hole; increase above-mentioned insulating casing and be equivalent to increasing the one deck protective layer, avoid the staff to be injured when inserting above-mentioned three-wire cable with above-mentioned discernment resistance, play the effect of conveniently carrying above-mentioned three-phase cable phase discriminator simultaneously.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is to be noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the same element.
The phase discrimination method and device for the three-phase cable provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (7)
1. A phase discrimination method for a three-phase cable is characterized by comprising the following steps:
a plurality of identification resistors are connected to the starting end of the three-phase cable, so that the starting end resistance values between any two cables are different;
and measuring the resistance value of the end to be measured between any two cables of the end to be measured of the three-phase cable, comparing the resistance value of the end to be measured with the resistance value of the starting end, and determining the phase corresponding to each cable of the end to be measured through the phase of the cable corresponding to the resistance value of the starting end and the resistance value of the starting end.
2. The phase detection method for a three-phase cable according to claim 1, wherein the switching in of a plurality of identification resistors at the start end of the three-phase cable so that the start end resistance values between any two cables are different comprises:
and respectively connecting the first identification resistor and the second identification resistor between the two cables at the starting end of the three-phase cable.
3. A phase discriminator for three-phase cable is characterized in that it comprises a plurality of identifying resistors and wire connectors;
the wire connector is used for connecting the identification resistor to the starting end of the three-phase cable, so that the resistance values of any two cables are different.
4. The three-phase cable phase detection device of claim 3, wherein the three-phase cable phase detection device includes a first discrimination resistor and a second discrimination resistor.
5. The three-phase cable phase detection device of claim 4, wherein the first identifying resistor and the second identifying resistor have resistance values ranging from 10 Ω to 10M Ω, inclusive.
6. The phase detector device of claim 3 wherein the wire connector is an alligator clip.
7. A phase detecting device for three-phase cables according to any of claims 3 to 6, characterized in that it comprises an insulating shell having a through hole, from which the connector protrudes from the insulating shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911328452.1A CN110954756A (en) | 2019-12-20 | 2019-12-20 | Phase discrimination method and device for three-phase cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911328452.1A CN110954756A (en) | 2019-12-20 | 2019-12-20 | Phase discrimination method and device for three-phase cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110954756A true CN110954756A (en) | 2020-04-03 |
Family
ID=69983192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911328452.1A Pending CN110954756A (en) | 2019-12-20 | 2019-12-20 | Phase discrimination method and device for three-phase cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110954756A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983522A (en) * | 2020-08-26 | 2020-11-24 | 广东韶钢松山股份有限公司 | Cable detection method |
| CN112098901A (en) * | 2020-08-12 | 2020-12-18 | 深圳供电局有限公司 | Cable identification method and device, computer equipment and readable storage medium |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201425613Y (en) * | 2009-03-10 | 2010-03-17 | 上海纳杰电气成套有限公司 | Phase detecting device for three-phase power supply connecting wire of electric equipment |
| CN201563086U (en) * | 2009-12-07 | 2010-08-25 | 河南省电力公司许昌供电公司 | Motor automatic phase demodulation actuating apparatus |
| CN104569629A (en) * | 2015-02-03 | 2015-04-29 | 孙超 | Phase sequence tester of low-voltage cables |
| CN206178078U (en) * | 2016-11-21 | 2017-05-17 | 国网浙江省电力公司湖州供电公司 | A multichannel is to line ware that is used for in batches circuit butt joint usefulness |
| CN106707043A (en) * | 2017-02-08 | 2017-05-24 | 杭州宇诺电子科技有限公司 | Three-phase alternating current phase detection method and phase detection system thereof |
| CN107015098A (en) * | 2017-04-28 | 2017-08-04 | 国网河南省电力公司安阳供电公司 | Cable branch instrument |
| CN206990725U (en) * | 2017-05-31 | 2018-02-09 | 国家电网公司 | A kind of novel transformer substation secondary cable alignment device |
| CN207181573U (en) * | 2017-04-28 | 2018-04-03 | 国网河南省电力公司安阳供电公司 | Cable proofreader instrument |
| CN107918081A (en) * | 2017-08-04 | 2018-04-17 | 国网浙江省电力公司湖州供电公司 | A kind of speech type multichannel alignment device |
-
2019
- 2019-12-20 CN CN201911328452.1A patent/CN110954756A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201425613Y (en) * | 2009-03-10 | 2010-03-17 | 上海纳杰电气成套有限公司 | Phase detecting device for three-phase power supply connecting wire of electric equipment |
| CN201563086U (en) * | 2009-12-07 | 2010-08-25 | 河南省电力公司许昌供电公司 | Motor automatic phase demodulation actuating apparatus |
| CN104569629A (en) * | 2015-02-03 | 2015-04-29 | 孙超 | Phase sequence tester of low-voltage cables |
| CN206178078U (en) * | 2016-11-21 | 2017-05-17 | 国网浙江省电力公司湖州供电公司 | A multichannel is to line ware that is used for in batches circuit butt joint usefulness |
| CN106707043A (en) * | 2017-02-08 | 2017-05-24 | 杭州宇诺电子科技有限公司 | Three-phase alternating current phase detection method and phase detection system thereof |
| CN107015098A (en) * | 2017-04-28 | 2017-08-04 | 国网河南省电力公司安阳供电公司 | Cable branch instrument |
| CN207181573U (en) * | 2017-04-28 | 2018-04-03 | 国网河南省电力公司安阳供电公司 | Cable proofreader instrument |
| CN206990725U (en) * | 2017-05-31 | 2018-02-09 | 国家电网公司 | A kind of novel transformer substation secondary cable alignment device |
| CN107918081A (en) * | 2017-08-04 | 2018-04-17 | 国网浙江省电力公司湖州供电公司 | A kind of speech type multichannel alignment device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112098901A (en) * | 2020-08-12 | 2020-12-18 | 深圳供电局有限公司 | Cable identification method and device, computer equipment and readable storage medium |
| CN112098901B (en) * | 2020-08-12 | 2022-10-28 | 深圳供电局有限公司 | Cable identification method and device, computer equipment and readable storage medium |
| CN111983522A (en) * | 2020-08-26 | 2020-11-24 | 广东韶钢松山股份有限公司 | Cable detection method |
| CN111983522B (en) * | 2020-08-26 | 2023-01-06 | 广东韶钢松山股份有限公司 | Cable detection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8942954B2 (en) | Fault location in a non-homogeneous electric power line | |
| JP2013055878A5 (en) | ||
| CN106291115A (en) | Distance power cable insulation impedance on-line monitoring method | |
| SE519964C2 (en) | Systems and methods for locating faults on a single load transmission line connected to outlets | |
| CN110954756A (en) | Phase discrimination method and device for three-phase cable | |
| CN109164319A (en) | Method for judging abnormal electricity utilization of building user | |
| JP2011200024A (en) | Leakage detector of low voltage power distribution system | |
| CN103823138A (en) | Circuit for monitoring power supply line electric parameters with auxiliary line | |
| CN205333777U (en) | Phase to earth fault positioner | |
| JP4599120B2 (en) | Electrical installation insulation monitoring device and method | |
| CN206292284U (en) | Generator amature shaft-voltage measurement part | |
| CN111856206A (en) | Live detection method and device for cable metal sheath electrical connection defect | |
| CN212646868U (en) | Electrified detection device of cable metal sheath electrical connection defect | |
| Al-Ghannam et al. | Development of open (broken) conductor detection system for high resistivity areas | |
| JP5602082B2 (en) | Short-circuit locating device, short-circuit locating method and program | |
| CN111537797B (en) | System and method for measuring insulation resistance of transformer substation without disassembling lead | |
| CN114296007A (en) | Method for measuring POE power supply parameters on line | |
| CN203825104U (en) | Circuit using auxiliary wires to monitor electrical parameters of power supplying line | |
| CN204287327U (en) | A kind of ultra-high-tension power transmission line zero sequence impedance metering circuit | |
| CN113820536A (en) | Zinc oxide arrester live-line detection method based on wireless synchronous current measurement technology | |
| JP5354568B2 (en) | System identification device | |
| CN217689177U (en) | Ground insulation resistance measuring device | |
| CN210894568U (en) | Cable short-circuit fault point position measuring circuit | |
| CN203774709U (en) | Power supply distribution unit and connecting module | |
| CN104101442A (en) | Generator rotor winding temperature online monitoring method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200403 |
|
| RJ01 | Rejection of invention patent application after publication |