CN209198566U - A kind of cable electrification identifier - Google Patents
A kind of cable electrification identifier Download PDFInfo
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- CN209198566U CN209198566U CN201821729748.5U CN201821729748U CN209198566U CN 209198566 U CN209198566 U CN 209198566U CN 201821729748 U CN201821729748 U CN 201821729748U CN 209198566 U CN209198566 U CN 209198566U
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- cable
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- current detector
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Abstract
The utility model discloses a kind of cables to charge identifier, which includes test device, the first current detector, the second current detector and ultrasonic receiver；Wherein, one end of the output end of the test device and the first current detector is connected, the other end of first current detector is used to be connected with the one end for being tested cable, it is the size of current being tested at cable other end ground line that second current detector, which is used to measure doubtful, and it is the ultrasonic signal for being tested the cable other end that ultrasonic receiver, which is used to receive doubtful,；The utility model proposes " three nothings " the cable electrification identifier based on ac and dc current method, audio frequency method, has stronger practicability and novelty by analysis cable shield two sides Grounding.Through scene actual use verifying, instrumentation is good, the live line inspection efficiency before substantially increasing protection regular inspection and protection transformation.
Description
Technical field
The utility model relates to cable testing technologies, and in particular to a kind of cable electrification identifier.
Background technique
The service life of microcomputer protective relay device is generally not less than 12 years, and scene need to carry out protection according to the actual situation and change
It makes.And the Substation Design service life is generally 50 years.Therefore, the substation to put into operation for a long time will undergo more wheel protection transformations.Due to
Unit in charge of construction's work is not in place, O&M unit checks and accepts in anti-accident measures execution not in place, over the years and changes the factors such as circuit, causes
Partial cables in the substation to put into operation for a long time " without (mistake) drawing, nothing (mistake) cable card, without adhesive plaster head " " three nothings " phenomenon is more
It is prominent.A large amount of secondary cable searching works involved in protection regular inspection, protection transformation process are carried out in above-mentioned substation.Due to lacking
Directly, effectively, rapidly lookup tool, lookup cable overlong time cause the duration nervous, and cannot be guaranteed accuracy rate, accidentally tear open
Cable easily causes the anomalous events such as false protection, brings very big puzzlement to relay protection work on the spot.
Utility model content
The purpose of the utility model is to overcome above-mentioned the deficiencies in the prior art, provide a kind of cable electrification identifier, with
Three other ends without cable can be quickly identified under live state, relay protection personnel is facilitated quickly to investigate thoroughly circuit, avoid accidentally tearing open
Run cable.
To achieve the above object, the technical solution of the utility model is:
A kind of cable electrification identifier, including test device, the first current detector, the second current detector and ultrasound
Wave receiver；Wherein,
One end of the output end of the test device and the first current detector is connected, the first current detector it is another
End is used to be connected with the one end for being tested cable, and the second current detector is the tested cable other end ground connection for measuring doubtful
Size of current at line, it is the ultrasonic signal for being tested the cable other end that ultrasonic receiver, which is used to receive doubtful,；
The test device is arranged the selectable test circuit of third gear, respectively audio signal sending controling circuit, adjustable
DC voltage source and ac small signal control circuit；The audio signal sending controling circuit is used to load sound to tested cable
Frequency signal；The adjustable direct voltage source is used for tested cable on-load voltage signal；The ac small signal control circuit is used
In to tested cable load ac current signal.
Chopper switch is serially connected between the output end and the first current detector of the test device.
The audio signal sending controling circuit is used for the audio letter audible to tested cable load 300Hz~3400Hz
Number.
The adjustable direct voltage source is used for the voltage signal of tested cable load 1.2V, 3.3V and 5V, error :≤±
0.1V；Output current scope: 0~20mA.
The ac small signal control circuit is used to load 1~20mA alternating current to tested cable.
Second current detector is clamp on amperemeter.
The utility model compared with prior art, the beneficial effect is that:
The utility model is proposed by analysis cable shield two sides Grounding based on ac and dc current method, audio
" three nothings " cable of method charges identifier, has stronger practicability and novelty.Through scene actual use verifying, instrumentation
Property it is good, substantially increase protection regular inspection and protection transformation before live line inspection efficiency.
Detailed description of the invention
Fig. 1 is cable its shielded layer two-terminal-grounding schematic diagram that scene uses；
Fig. 2 is the circuit diagram that cable provided by the embodiment of the utility model charges identifier；
Fig. 3 is the schematic diagram of audio signal sending controling circuit；
Fig. 4 is the schematic diagram of ac small signal control circuit；
Fig. 5 is the flow chart that ac/dc current method identifies tested cable；
Fig. 6 is the flow chart that audio frequency method identifies tested cable；
In figure: 1, test device；2, the first current detector；3, clamp on amperemeter；4, tested cable shield is disconnected
Ground line；11, audio signal sending controling circuit；12, adjustable direct voltage source；13, ac small signal control circuit.
Specific embodiment
The content of the utility model is described in further details with reference to the accompanying drawings and detailed description.
Embodiment:
As shown in fig.2, cable provided in this embodiment charges identifier, including test device 1, the first current detector
2, clamp on amperemeter 3 and ultrasonic receiver.
Wherein, one end of the output end of the test device 1 and the first current detector 2 is connected, the first current detector 2
The other end be used to be connected with the one end for being tested cable, that is to say, that three formed a series connection；Test device 1 is main
For exporting test signal loading to tested cable, specifically, which is provided with third gear test signal output, respectively
For audio signal sending controling circuit 11 (abbreviation audio shelves), adjustable direct voltage source 12 (abbreviation DC current shelves) and exchange
Small signal control circuit 13 (abbreviation alternating current shelves)；The audio signal sending controling circuit 11 is used to load sound to tested cable
Frequency signal；The adjustable direct voltage source 12 is used for tested cable on-load voltage signal；The ac small signal control circuit 13 is used
In to tested cable load ac current signal.
And the clamp on amperemeter 3 is at the tested cable other end ground line then doubtful for connecing, it is electric at this to measure
The size of stream, and the ultrasonic receiver be then used to connect it is doubtful be other end of the tested cable, be the quilt to receive doubtful
Survey the acoustic signals of the cable other end.That is, the output end of test device 1 is to connect in one end of cable when initial testing,
And be that then cramp joint has an ammeter 3 for the connecting part of the other end of the cable doubtful, or it is doubtful be the other end of the cable
It is connected with ultrasonic receiver.
It is required according to anti-accident measures, secondary grounded screen should be laid in substation.Access electric current, the electricity of microcomputer protecting device
Pressure and control, signal circuit should use shielded cable, and shielded layer should be connect with secondary grounded screen in switch yard with relay protection room simultaneously:
For the secondary cable of single shielded layer, shielded layer answers two-terminal-grounding, and for the secondary cable of double shield layer, external shielding layer two is terminated
Ground, internal shield preferably indoors hold one point earth.As shown in Figure 1, due to cable its shielded layer two-terminal-grounding that scene uses, benefit
With this feature, it can use and the method for the artificial dosage in shielded layer one end positions the cable other end.
It follows that this identifier by apply the small signal of alternating current and direct current, using cable shield both ends grounding point with
The earth is formed into a loop, to judge cable louding.If both ends are not grounded or substation cable simultaneously for some reason
Interior secondary grounded screen and not formed network cause cable ends grounding point not in same grounded screen, then use two-terminal-grounding
Method can not be formed into a loop, to not be available.When invalid using ac and dc current method, that is, audio frequency method conduct can be used
Effectively supplement.After instrument loads audio signal to cable shield, cable is detected by acoustic receiver in the cable other side.If
The cable shield other side is unearthed, then because attenuation is small, can receive apparent acoustic signals, effect is more significant.Thus
It is found that the cable that this cable charges in identifier various situations interior for station can fast live line identification.
One kind as the present embodiment preferably concatenates between the output end and the first current detector of above-mentioned test device
There is chopper switch K, in order to control the output of test signal.
Specifically, above-mentioned audio signal sending controling circuit is used for audible to tested cable load 300Hz~3400Hz
The audio signal seen；Adjustable direct voltage source is used for the voltage signal of tested cable load 1.2V, 3.3V and 5V, error :≤
±0.1V；Output current scope: 0~20mA；Ac small signal control circuit is used to load 1~20mA alternating current to tested cable
Stream.
Correspondingly, this implementation additionally provides a kind of cable electrification recognition methods, i.e. terminal box or relay protection at the scene
Interior, to be identified three without connecting test connection according to Fig. 2 at cable shielding layer earthing line.It is as follows to charge identification step:
S1, one end of the first current detector is connected with the output end of test device, the other end is connected to tested electricity
One end of cable；Second current detector is connect at the other end ground line of doubtful tested cable；
S2, the shielding layer grounding line (i.e. shown in icon 4 in Fig. 2) for disconnecting tested cable；
S3, select adjustable direct voltage source or ac small signal control circuit as test device according to field condition
Output；
Whether S4, the first current detector of observation detect that electric current exports, if so, S5 is then entered step, if nothing, into
Enter step S6；
Size of current detected by S5, the first current detector of record, and observe and record the second current detector and examined
The size of current measured, and whether the size of current for comparing the two is consistent, being is then same root cable, terminates measurement；It is no, then
It is not same root cable, continues to search next cable；
S6, select audio signal sending controling circuit as the output of test device, and in the another of doubtful tested cable
End is connected with ultrasonic receiver；
S7, it observes and records whether ultrasonic receiver receives acoustic signals, if so, being same root cable, terminates to survey
Amount；It is no, then it is not same cable, continues to search next cable.
That is, this recognition methods is broadly divided into two measurement process, first is that being identified by ac/dc current method
Three without the cable other side, and detailed process is as shown in Figure 3；Second is that identifying cable by audio frequency method.
If finding that the first current detector 2 can not export electric current using ac and dc current method, in the feelings for excluding wiring error
Under condition, can be inferred that it is because shielded layer two sides are formed into a loop not over secondary grounded screen.Possible reason has: construction rank
Section unit in charge of construction is not cable one or both sides make shielding layer grounding line, cable two sides shielding layer grounding line is not connected to two correctly
Secondary grounded screen, the secondary grounded screen in two sides is not yet in effect links together.At this point it is possible to using audio frequency method, identification process such as Fig. 4 institute
Show.
To sum up, the utility model by analysis cable shield two sides Grounding, propose based on ac and dc current method,
" three nothings " cable of audio frequency method charges identifier, has stronger practicability and novelty.Through scene actual use verifying, instrument
Operational good, before substantially increasing protection regular inspection and protection transformation live line inspection efficiency.
For above-described embodiment simply to illustrate that the technical ideas and features of the present invention, its purpose is allows this field
Interior those of ordinary skill can understand the content of the utility model and implement accordingly, can not limit the utility model with this
Protection scope.The equivalent changes or modifications that all essence according to the content of the present invention is made, should all cover in this reality
With in novel protection scope.
Claims (6)
1. a kind of cable charges identifier, which is characterized in that including test device, the first current detector, the second current detecting
Device and ultrasonic receiver；Wherein,
One end of the output end of the test device and the first current detector is connected, and the other end of the first current detector is used
It is connected in one end of tested cable, the second current detector is at the tested cable other end ground line for measuring doubtful
Size of current, ultrasonic receiver be used to receive it is doubtful be the tested cable other end ultrasonic signal；
The test device is provided with the selectable test circuit of third gear, respectively audio signal sending controling circuit, straight-adjustable
Galvanic electricity potential source and ac small signal control circuit；The audio signal sending controling circuit is used to load audio to tested cable
Signal；The adjustable direct voltage source is used for tested cable on-load voltage signal；The ac small signal control circuit is used for
Ac current signal is loaded to tested cable.
2. cable as described in claim 1 charges identifier, which is characterized in that in the output end of the test device and first
Chopper switch is serially connected between current detector.
3. cable as described in claim 1 charges identifier, which is characterized in that the audio signal sending controling circuit is used for
Give tested cable load 300Hz~3400Hz audible audio signal.
4. cable as described in claim 1 charges identifier, which is characterized in that the adjustable direct voltage source is used for tested
Cable loads the voltage signal of 1.2V, 3.3V and 5V, error :≤± 0.1V；Output current scope: 0~20mA.
5. cable as described in claim 1 charges identifier, which is characterized in that the ac small signal control circuit is for giving
Tested cable loads 1~20mA alternating current.
6. cable as described in claim 1 charges identifier, which is characterized in that the second current detector is clamp on amperemeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821729748.5U CN209198566U (en) | 2018-10-24 | 2018-10-24 | A kind of cable electrification identifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821729748.5U CN209198566U (en) | 2018-10-24 | 2018-10-24 | A kind of cable electrification identifier |
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| Publication Number | Publication Date |
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| CN209198566U true CN209198566U (en) | 2019-08-02 |
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ID=67408961
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| CN201821729748.5U Active CN209198566U (en) | 2018-10-24 | 2018-10-24 | A kind of cable electrification identifier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109307817A (en) * | 2018-10-24 | 2019-02-05 | 中国南方电网有限责任公司超高压输电公司柳州局 | A kind of cable electrification identifier and recognition methods |
| CN111208392A (en) * | 2020-04-16 | 2020-05-29 | 武汉格蓝若智能技术有限公司 | Label-free cable collection trend identification method |
-
2018
- 2018-10-24 CN CN201821729748.5U patent/CN209198566U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109307817A (en) * | 2018-10-24 | 2019-02-05 | 中国南方电网有限责任公司超高压输电公司柳州局 | A kind of cable electrification identifier and recognition methods |
| CN109307817B (en) * | 2018-10-24 | 2024-04-02 | 中国南方电网有限责任公司超高压输电公司柳州局 | Cable live identification instrument and identification method |
| CN111208392A (en) * | 2020-04-16 | 2020-05-29 | 武汉格蓝若智能技术有限公司 | Label-free cable collection trend identification method |
| CN111208392B (en) * | 2020-04-16 | 2020-07-31 | 武汉格蓝若智能技术有限公司 | Label-free cable collection trend identification method |
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