CN110672921A - 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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- CN110672921A CN110672921A CN201911053701.0A CN201911053701A CN110672921A CN 110672921 A CN110672921 A CN 110672921A CN 201911053701 A CN201911053701 A CN 201911053701A CN 110672921 A CN110672921 A CN 110672921A
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- G—PHYSICS
- 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 handheld terminal is connected with a cable head needing to judge the phase through the alligator clip, the detection terminal is fixed at one end of the known phase of the power cable, a power supply of the handheld terminal forms a loop through the alligator clip, the three-phase power cable and the grounding wire, the detection terminal detects whether the fixed power cable flows through current and sends a signal to the handheld terminal, and the handheld terminal judges the phase of the power cable through the signal and displays a result. The invention can judge the phase of the other end safely in a time-saving, labor-saving way when the phase of one end of the three-core power cable is known. The invention can accurately and quickly judge the phase of the middle head of the cable in the known two-end phase of the three-core power cable or the phase of one end and clearly determine the phase target of the other end, thereby guiding the connection of the middle head of the cable.
Description
Technical Field
The invention belongs to the technical field of power system construction, relates to laying and maintaining of a three-core power cable, and particularly relates to a phase detection device of the three-core power cable in an off-line state.
Background
At present, a power cable of a power distribution network usually adopts a three-core power cable, but the power cable has multiple cable middle heads and is variable for constructors, and the color code of the power cable cannot always accurately represent the real phase of the power cable. Therefore, the phase checking is required when the power grid is accessed. The traditional phase checking method is that one end of the phase checking method is connected with a cable by using a megger, and the other end of the phase checking method is used for measuring current by using a multimeter, so that the phase is judged and marked, and the phase is judged phase by phase. The two ends of the power cable are provided with workers, and the cable needs to be charged in the testing process, so that electric shock danger exists. When the middle head of the medium-voltage power cable is connected, the phase of the cable before and after connection cannot be guaranteed to be unchanged due to the fact that connection is completely carried out according to the color codes, the phase sequence of a user after the power cable is powered on is always wrong, the wrong phase sequence is measured, the cable head is readjusted according to the wrong phase sequence, the phase sequence of the user can be guaranteed to be correct, power utilization time is delayed, and workload of workers is increased.
Disclosure of Invention
The invention provides a device for judging the phase of a three-core power cable in an off-line state, which aims to solve the problem that the phase of the three-core power cable cannot be judged in the construction process.
In order to achieve the purpose, the invention adopts the following specific technical scheme:
a 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 handheld terminal is held by a worker and operated at one end of a power cable, where a phase needs to be measured, and comprises a current generation unit, a rechargeable battery, a key switch, a change-over switch, a signal receiving module, three alligator 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 generation unit is connected to the red alligator clip through a key switch, and the negative polarity segment of the current generation unit is switchably connected to the yellow alligator clip or the green alligator 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 a signal sending module in the detection terminal;
each set of detection terminal comprises three terminal units, each terminal unit comprises a current detection module, a signal sending module and a binding belt, the current detection module is connected with the signal sending 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 preferred embodiments:
when the phase of the three-core power cable is judged, a worker clamps three crocodile clamps with leads on a three-phase cable conductor at one end of the power cable, which needs to measure the phase, respectively;
at one end of the known phase of the power cable, three terminal units which identify different phases are respectively bound on the three-phase cable conductors corresponding to the phase sequence through respective binding bands, and then the outer ends of the three-phase cable conductors are connected and grounded through grounding wires.
When a key switch of the handheld terminal is pressed down, the processor controls the rechargeable battery to charge the current generation unit, and the anode of the current generation unit is electrically communicated with the red crocodile clip; the negative polarity end of the current generation unit is connected to the yellow or green crocodile clip by the control change-over switch;
the current detection modules in the three terminal units of the detection terminal detect current signals in a loop, transmit the detection signals to the signal receiving module in the handheld terminal through the signal sending module, and then upload the detection signals to the processor.
When the processor receives a current detection signal sent by the detection terminal, the processor controls the action of the change-over switch to switch the yellow or green crocodile clip connected with the negative polarity end of the current generation unit to the green or yellow crocodile clip, 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 by judgment through the display module.
The three terminal units are set with yellow, green and red colors respectively corresponding to A, B, C three phases.
The change over switch is a manual switch, and after 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 the other alligator 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 carry out change-over operation.
The invention has the following beneficial effects:
the invention provides a phase detection device of a three-core power cable in an off-line state, which can judge the phase of one end of the three-core power cable in a time-saving, labor-saving and safe manner when the phase of the other end is known. The invention can accurately and quickly judge the phase of the middle head of the cable in the known two-end phase of the three-core power cable or the phase of one end and clearly determine the phase target of the other end, thereby guiding the connection of the middle head of the cable.
Description of the drawings:
FIG. 1 is a schematic structural diagram of a power cable phase detection apparatus in an off-line state according to the present invention;
FIG. 2 is a block diagram of a hand-held terminal;
FIG. 3 is a block diagram of a detection terminal;
FIG. 4 is a connection diagram of a cable termination device measured using the present invention;
fig. 5 is a connection diagram of a device for measuring the middle head of a cable using the present invention.
1-a handheld terminal; 2-detecting a terminal; 3-1-3-crocodile clips with leads, wherein 3-1 is a yellow crocodile clip, 3-2 is a green crocodile clip, and 3-3 is a red crocodile clip; 4-a display module; 5-a key switch; 6-binding band; 7-the current detection module and the signal sending module are integrated, wherein the phase A of the 7-1 mark is set to be yellow, the phase B of the 7-2 mark is set to be green, and the phase C of the 7-3 mark is set to be red; 8-a current generating unit; 9-a diverter 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-the phase end of the power cable is required to be measured; 16-a power cable body; 17-ground line.
The specific implementation mode is as follows:
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Referring to fig. 1 to 3, the phase determination apparatus for a three-core power cable 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 arranged into 3 crocodile clips with different colors, namely yellow crocodile clips 3-1, green crocodile clips 3-2 and red crocodile clips 3-3.
The handheld terminal 1 includes a current generating unit 8, a 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 in a set, and each detection terminal unit comprises a current detection module 12, a signal sending module 13 and a binding belt 6.
Referring to fig. 4-5, when performing phase detection of the three-phase power cable terminal, a worker needs to bind a set of detection terminals 2 to the three phases of the known phase terminal 14 of the power cable by the binding bands 6, that is, the yellow terminal unit 7-1, the green terminal unit 7-2, and the red terminal unit 7-3 are bound to the A, B, C three-phase cable of the power cable by the respective binding bands 6, and then connected and grounded to the outer ends of the conductors of the three-phase cable by the ground wires.
Pressing key switch 5, processor 11 controlling the charging battery to charge current generating unit 8, displaying "phase detection of power cable terminal head on display module 4, please clamp crocodile clips on power cable three-phase terminal head …", then clamping crocodile clips 3 with wires on power cable phase detection required terminal 15, namely, connecting the positive pole of current generating unit 8 with red crocodile clip electricity 3-3 ", controlling a change-over switch to connect the negative pole end of current generating unit to yellow crocodile clip 3-1 or green crocodile clip 3-2, processor 11 controlling switch 9 to use crocodile clip as positive pole, yellow crocodile clip as negative pole to transmit current signal, forming a loop through power cable body 16 and ground wire 17, detecting whether current detecting module 12 of terminal 2 detects that current of power cable passes through, sending signal sending module 13 to signal receiving module 10 to send corresponding signal (for example, ① connecting red crocodile clip at hand-held terminal head, yellow clip connecting with No. 2, green clip connecting with crocodile clip 3, detecting that current signal receiving module detects that No. 1 is red clip, then, when No. 2 signal receiving module detects that No. 1 is red clip connected with red clip, then switching signal receiving module detects that No. 2, switching to red clip signal receiving module detects that No. 1, and displaying No. 2, when No. 1, switching to yellow clip signal receiving module detects that current signal receiving module detects that there is No. 2, and displaying No. 1 as yellow clip, and displaying No. 3, and displaying No. 2, and displaying No. 1 as yellow clip, and displaying No. 2, and displaying No. 3, when AB 3, and displaying No. 1.
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 selects 'phase detection of the middle head of the cable', and the processor 11 can simultaneously display the phase detection results of two sides of the middle head of the cable on the display module 4, so that the connection of the middle head of the cable is guided.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (8)
1. A 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 handheld terminal is held by a worker and operated at one end of a power cable, where a phase needs to be measured, and comprises a current generation unit, a rechargeable battery, a key switch, a change-over switch, a signal receiving module, three alligator 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 generation unit is connected to the red alligator clip through a key switch, and the negative polarity segment of the current generation unit is switchably connected to the yellow alligator clip or the green alligator 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 a signal sending module in the detection terminal;
each set of detection terminal comprises three terminal units, each terminal unit comprises a current detection module, a signal sending module and a binding belt, the current detection module is connected with the signal sending module, and each detection terminal is bound at a known phase end corresponding to the power cable through the binding belt.
2. The phase detection device for the three-core power cable in the off-line state according to claim 1, wherein:
when the phase of the three-core power cable is judged, a worker clamps three crocodile clamps with leads on a three-phase cable conductor at one end of the power cable, which needs to measure the phase, respectively;
at one end of the known phase of the power cable, three terminal units which identify different phases are respectively bound on the three-phase cable conductors corresponding to the phase sequence through respective binding bands, and then the outer ends of the three-phase cable conductors are connected and grounded through grounding wires.
3. The off-line state 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 generation unit, and the anode of the current generation unit is electrically communicated with the red crocodile clip; the negative polarity end of the current generation unit is connected to the yellow or green crocodile clip by the control change-over switch;
the current detection modules in the three terminal units of the detection terminal detect current signals in a loop, transmit the detection signals to the signal receiving module in the handheld terminal through the signal sending module, and then upload the detection signals to the processor.
4. The off-line state three-core power cable phase detection device according to claim 3, wherein:
when the processor receives a current detection signal sent by the detection terminal, the processor controls the action of the change-over switch to switch the yellow or green crocodile clip connected with the negative polarity end of the current generation unit to the green or yellow crocodile clip, 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 phase detecting device for the three-core power cable in the off-line state according to any one of claims 1 to 4, wherein:
and the processor displays the phase of the three-core power cable obtained by judgment through the display module.
6. The phase detecting device for the three-core power cable in the off-line state according to any one of claims 1 to 4, wherein:
the three terminal units are set with yellow, green and red colors respectively corresponding to A, B, C three phases.
7. The off-line state three-core power cable phase detection device according to claim 6, wherein:
the change over switch is a manual switch, and after 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 the other alligator clip for second detection.
8. The off-line state 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 carry out 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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| CN110672921B (en) | 2023-04-28 |
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