CN110672921B - Three-core power cable phase detection device in off-line state - Google Patents
Three-core power cable phase detection device in off-line state Download PDFInfo
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- CN110672921B CN110672921B CN201911053701.0A CN201911053701A CN110672921B CN 110672921 B CN110672921 B CN 110672921B CN 201911053701 A CN201911053701 A CN 201911053701A CN 110672921 B CN110672921 B CN 110672921B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
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Abstract
A three-core power cable phase detection device in an off-line state comprises a handheld terminal and a plurality of sets of detection terminals. The hand-held terminal is connected with a cable head needing to be phase-judged through the crocodile clamp, the detection terminal is fixed at one end of the known phase of the power cable, a power supply of the hand-held terminal forms a loop through the crocodile clamp, the three-phase power cable and the ground wire, the detection terminal detects whether the fixed power cable flows through current or not and sends signals to the hand-held terminal, and the hand-held terminal judges the phase of the power cable through the signals and displays the result. The invention can judge the phase of the other end safely in a time-saving and labor-saving way when the phase of one end of the three-core power cable is known. The invention can accurately and rapidly judge the phase of the cable intermediate head at the two ends of the known three-core power cable or at one end of the known three-core power cable, and the other end of the known three-core power cable can be used for determining the phase target of the other end of the known three-core power cable, thereby guiding the connection of the cable intermediate head.
Description
Technical Field
The invention belongs to the technical field of power system construction, relates to three-core power cable laying and maintenance, and particularly relates to a three-core power cable phase detection device in an off-line state.
Background
At present, a three-core power cable is often adopted as a power cable of a power distribution network, but the power cable is multiple in middle heads and changeable in constructors, and the color code of the power cable cannot always accurately represent the real phase of the power cable. Thus, nuclear phase is required when accessing the grid. The traditional phase checking method is that one end is connected with a cable by using a cradle, and the other end is used for measuring current by using a universal meter, so that the phase is judged, marking is carried out, and the phase judgment is completed phase by phase. The work requires that the power cable both ends have staff, and the cable needs to be charged in the testing process, has electric shock danger. When the middle head of the medium-voltage power cable is connected, the phase of the cable is not changed before and after the connection due to the fact that the cable is connected completely according to the color code, the phase sequence error of a user after the power cable is transmitted always occurs, the phase sequence error is measured, the cable head is readjusted according to the phase sequence error, the phase sequence of the user is ensured to be correct, the power utilization time is delayed, and the workload of staff is increased.
Disclosure of Invention
The invention provides a three-core power cable phase judging device in an off-line state, which aims to solve the problem that the three-core power cable phase cannot be judged in the construction process.
In order to achieve the above purpose, the specific technical scheme adopted by the invention is as follows:
the three-core power cable phase detection device in an off-line state comprises a handheld terminal and at least 1 set of detection terminals; the method is characterized in that:
the hand-held terminal is held by a worker to operate at one end of the power cable, which is required to be measured in phase, and comprises a current generating unit, a rechargeable battery, a key switch, a change-over switch, a signal receiving module, three crocodile clips with leads, a processor and a display module;
the rechargeable battery is connected with the current generation unit and is used for providing electric energy supply for the current generation unit;
the positive polarity end of the current generating unit is connected to the red crocodile clip through a key switch, and the negative polarity section of the current generating unit is switchably connected to the yellow crocodile clip or the green crocodile clip through a change-over switch;
the signal receiving module, the display module and the current generating unit are all connected with the processor;
the signal receiving module is in wireless communication with the signal transmitting module in the detection terminal;
every 1 sets of detection terminals comprise three terminal units, each terminal unit comprises a current detection module, a signal transmission module and a binding belt, the current detection module is connected with the signal transmission module, and each detection terminal is bound at a known phase end corresponding to the power cable through the binding belt.
The invention further comprises the following preferable schemes:
when judging the phase of the three-core power cable, a worker clamps three crocodile clamps with wires on a three-phase cable conductor at one end of the power cable, the phase of which is to be measured;
at one end of the known phase of the power cable, three terminal units which are marked with different phases are respectively bound on three-phase cable conductors of corresponding phase sequences through respective binding bands, and then the outer ends of the three-phase cable conductors are connected with the ground through a ground wire.
When a key switch of the handheld terminal is pressed down, the processor controls the rechargeable battery to charge the current generating unit, and the anode of the current generating unit is electrically communicated with the red crocodile clip; the control change-over switch firstly connects the negative end of the current generating unit to the yellow or green crocodile clip;
the current detection modules in the three terminal units of the detection terminal detect current signals in the loop, and the detection signals are transmitted to the signal receiving module in the handheld terminal through the signal sending module and then uploaded to the processor.
When the processor receives the current detection signal sent by the detection terminal, the change-over switch is controlled to act, the yellow or green crocodile clamp connected with the negative polarity end of the current generation unit is changed into the green or yellow crocodile clamp, and then the detection terminal uploads the current signal detected by the corresponding phase current detection module to the processor through the signal sending module and the signal receiving module.
And the processor displays the phase of the three-core power cable obtained through judgment through the display module.
The three terminal units are provided with three colors of yellow, green and red, which respectively correspond to A, B, C three phases.
The change-over switch is a manual switch, and when the processor displays the first current detection signal of the detection terminal through the display module, a worker immediately operates the change-over switch to switch the negative polarity end of the current generation unit to another crocodile clip for second detection.
The change-over switch is an automatic switch, and when the processor receives a first current detection signal sent by the detection terminal, the change-over switch is automatically controlled to perform a change-over operation.
The invention has the following beneficial effects:
the invention provides a three-core power cable phase detection device in an off-line state, which can judge the phase of one end of a three-core power cable safely in a time-saving and labor-saving manner when the phase of the other end of the three-core power cable is known. The invention can accurately and rapidly judge the phase of the cable intermediate head at the two ends of the known three-core power cable or at one end of the known three-core power cable, and the other end of the known three-core power cable can be used for determining the phase target of the other end of the known three-core power cable, thereby guiding the connection of the cable intermediate head.
Description of the drawings:
FIG. 1 is a schematic diagram of a power cable phase detection device in an off-line state according to the present invention;
FIG. 2 is a block diagram of a handheld terminal;
FIG. 3 is a block diagram of a detection terminal;
FIG. 4 is a connection diagram of a measurement cable termination device using the present invention;
fig. 5 is a connection diagram of a mid-head device of a measurement cable using the present invention.
1-a handheld terminal; 2-detecting a terminal; 3-1-3-crocodile clip with lead, 3-1 is yellow crocodile clip, 3-2 is green crocodile clip, 3-3 is red crocodile clip; 4-a display module; 5-a key switch; 6-binding bands; the 7-current detection module and the signal transmission module are integrated, wherein the 7-1 mark A phase is set to be yellow, the 7-2 mark B phase is set to be green, and the 7-3 mark C phase is set to be red; 8-a current generating unit; 9-a change-over switch; 10-a signal receiving module; 11-a processor; 12-a current detection module; 13-a signal transmission module; 14-known phase end of power cable; 15-a phase end of the power cable to be measured; 16-a power cable body; 17-ground wire.
The specific embodiment is as follows:
in order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Referring to fig. 1 to 3, the three-core power cable phase judging device in an off-line state according to the present invention includes a handheld terminal 1 and a plurality of sets of detection terminals 2. The shell of the handheld terminal 1 comprises crocodile clips 3 with wires, a display module 4 and a key switch 5, wherein the crocodile clips 3 are 3 crocodile clips with different colors, namely a yellow crocodile clip 3-1, a green crocodile clip 3-2 and a red crocodile clip 3-3.
The interior of the handheld terminal 1 comprises a current generating unit 8, a change-over switch 9, a signal receiving module 10 and a processor 11. The detection terminal 2 is provided with three terminal units, namely a yellow terminal unit 7-1, a green terminal unit 7-2 and a red terminal unit 7-3, and each detection terminal unit comprises a current detection module 12, a signal transmission module 13 and a binding belt 6.
Referring to fig. 4 to 5, when performing three-core power cable termination phase detection, a worker needs to bind a set of detection terminals 2 to three phases of a known phase end 14 of a power cable by binding bands 6, namely, a yellow terminal unit 7-1, a green terminal unit 7-2 and a red terminal unit 7-3 to A, B, C three-phase cables of the power cable by respective binding bands 6, and then connect the outer ends of the three-phase cable conductors to ground by a ground wire.
Pressing the key switch 5, controlling the rechargeable battery to charge the current generating unit 8 by the processor 11, displaying a ' power cable terminal phase detection, please clamp crocodile clamps on a power cable three-phase terminal … ', then clamping crocodile clamps 3 with wires on a power cable phase end 15 to be detected respectively, and communicating the positive electrode of the current generating unit 8 with the red crocodile clamp electricity 3-3 ' on the display module 4; the control switch first connects the negative polarity terminal of the current generating unit to either the yellow crocodile clamp 3-1 or the green crocodile clamp 3-2. The processor 11 uses the red crocodile clip as an anode through the control switch 9, the yellow crocodile clip as a cathode emits a current signal, a loop is formed through the power cable body 16 and the grounding wire 17, the current detection module 12 of the detection terminal 2 detects whether the bundled power cable passes through the current signal, and a corresponding signal is sent back to the signal receiving module 10 through the signal sending module 13 (for example, (1) the red crocodile clip is connected with the No. 1 wire end, the yellow crocodile clip is connected with the No. 2 wire end, the green crocodile clip is connected with the No. 3 wire end, firstly the red crocodile clip is an anode, the yellow crocodile clip is a cathode, when the detection terminal displays that the AB phase has the current signal, the No. 1 wire and the No. 2 wire are proved to be AB or BA phases, then the green crocodile clip is switched through the switch 9, and if the detection terminal displays that the BC phase has the current signal, the No. 1 wire is judged to be B, and the No. 2 wire is judged to be A, and the No. 3 wire is C phase. After receiving the signal, the processor 11 changes the current loop through the control switch 9, and transmits a current signal by taking the red crocodile clip as the positive electrode and the green crocodile clip as the negative electrode, and the current detection unit module 12 detects whether the bundled power cable passes through the current, and sends a corresponding signal back to the signal receiving module 10 through the signal sending module 13. The processor 11 of the handheld terminal 1 analyzes the signal received by the signal receiving module 10 and displays the phase result on the display module 4.
The phase detection principle of the middle head of the three-core power cable is the same as that of the terminal head, the key 5 is used for selecting 'phase detection of the middle head of the cable', and the processor 11 can simultaneously display the phase detection results of the two sides of the middle head of the cable on the display module 4, so that the middle head of the cable is guided to be connected.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (8)
1. The three-core power cable phase detection device in an off-line state comprises a handheld terminal and at least one set of detection terminals; the method is characterized in that:
the hand-held terminal is held by a worker to operate at one end of the power cable, which is required to be measured in phase, and comprises a current generating unit, a rechargeable battery, a key switch, a change-over switch, a signal receiving module, three crocodile clips with leads, a processor and a display module;
the rechargeable battery is connected with the current generation unit and is used for providing electric energy supply for the current generation unit;
the signal receiving module, the display module and the current generating unit are all connected with the processor;
the signal receiving module is in wireless communication with the signal transmitting module in the detection terminal;
each set of detection terminal comprises three terminal units, each terminal unit comprises a current detection module, a signal transmission module and a binding belt, the current detection module is connected with the signal transmission module, each detection terminal unit is bound at a known phase end corresponding to the power cable through the binding belt, and the tail ends of the outer sides of the three-phase cable conductors are connected with the ground through a ground wire;
when the phase of the three-core power cable is judged, a worker clamps three crocodile clamps with wires on three-phase cable conductors at one end of the power cable, which is required to be subjected to phase measurement, the positive polarity end of the current generating unit is connected to the red crocodile clamp through a key switch, and the negative polarity end of the current generating unit is switchably connected to the yellow crocodile clamp or the green crocodile clamp through a change-over switch; a loop is formed through the power cable body and the grounding wire, a current detection module of the detection terminal detects whether the bundled power cable passes through current or not, and a corresponding signal is sent back to the signal receiving module through the signal sending module; the hand-held terminal is connected with a No. 1 wire end of one end of the power cable, which is required to be subjected to phase measurement, the yellow crocodile clip is connected with a No. 2 wire end, the green crocodile clip is connected with a No. 3 wire end, firstly the red crocodile clip is used as a positive electrode, the yellow crocodile clip is used as a negative electrode, and when the detection terminal displays that an AB phase has a current signal, the No. 1 wire and the No. 2 wire are proved to be AB or BA phases; and then, the green crocodile clip is switched by a switch to serve as a negative electrode, if the detection terminal displays that the BC phase has a current signal, the line 1 is judged to be the B phase, the line 2 is judged to be the A phase, and the line 3 is judged to be the C phase.
2. The off-line three-core power cable phase detection device according to claim 1, wherein:
at one end of the known phase of the power cable, three terminal units identifying different phases are respectively bound on the three-phase cable conductors of corresponding phase sequences through respective binding bands.
3. The off-line three-core power cable phase detection device according to claim 2, wherein:
when a key switch of the handheld terminal is pressed down, the processor controls the rechargeable battery to charge the current generating unit, and the anode of the current generating unit is electrically communicated with the red crocodile clip; the control change-over switch firstly connects the negative end of the current generating unit to one of yellow or green crocodile clips;
the current detection modules in the three terminal units of the detection terminal detect current signals in the loop, and the detection signals are transmitted to the signal receiving module in the handheld terminal through the signal sending module and then uploaded to the processor.
4. The off-line three-core power cable phase detection device according to claim 3, wherein:
when the processor receives the current detection signal sent by the detection terminal, the change-over switch is controlled to act, the yellow or green crocodile clamp connected with the negative polarity end of the current generation unit is changed into the green or yellow crocodile clamp, and then the detection terminal uploads the current signal detected by the corresponding phase current detection module to the processor through the signal sending module and the signal receiving module.
5. The off-line three-core power cable phase detection device according to any one of the claims 1-4, wherein:
and the processor displays the phase of the three-core power cable obtained through judgment through the display module.
6. The off-line three-core power cable phase detection device according to any one of the claims 1-4, wherein:
the three terminal units are provided with three colors of yellow, green and red, which respectively correspond to A, B, C three phases.
7. The off-line three-core power cable phase detection device according to claim 6, wherein:
the change-over switch is a manual switch, and when the processor displays the first current detection signal of the detection terminal through the display module, a worker immediately operates the change-over switch to switch the negative polarity end of the current generation unit to another crocodile clip for second detection.
8. The off-line three-core power cable phase detection device according to claim 6, wherein:
the change-over switch is an automatic switch, and when the processor receives a first current detection signal sent by the detection terminal, the change-over switch is automatically controlled to perform a change-over operation.
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| CN201911053701.0A CN110672921B (en) | 2019-10-31 | 2019-10-31 | Three-core power cable phase detection device in off-line state |
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| CN201911053701.0A CN110672921B (en) | 2019-10-31 | 2019-10-31 | Three-core power cable phase detection device in off-line state |
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