CN203249986U - Broken line positioning device with high precision and low noise for wires and cables - Google Patents
Broken line positioning device with high precision and low noise for wires and cables Download PDFInfo
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- CN203249986U CN203249986U CN 201320318891 CN201320318891U CN203249986U CN 203249986 U CN203249986 U CN 203249986U CN 201320318891 CN201320318891 CN 201320318891 CN 201320318891 U CN201320318891 U CN 201320318891U CN 203249986 U CN203249986 U CN 203249986U
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Abstract
The utility model relates to a broken line positioning device with high precision and low noise for wires and cables. The positioning device is characterized by comprising a 3 kHz audio signal source, a capacitive sensor, a broken line signal receiving power amplifier, a broken line signal comparator, a signal modulating generator and a 12 V power source in organic connection. The capacitive sensor is composed of a metal wire sheath, an insulation cladding layer sleeved on the surface of the metal wire sheath, and a copper strip shield cladding layer coated on the surface of the insulation cladding layer. The copper strip shield cladding layer is grounded. The metal wire sheath is provided with a broken signal output terminal. The positioning device has a sound and light alarming function for a broken point, and has low background noise. Samples are obtained in a capacitive manner, a metal pipe or a U-shaped metal device of the capacitive sensor has a good shielding layer, and the shielding layer is grounded, so external space interference is reduced, the background noise is reduced by 20-30 db, sound and light signal changes at the broken position is very clear, and the precision of measuring is improved greatly.
Description
Technical field
The utility model relates to a kind of electric wire burn out detection location instrument.
Background technology
The location of existing electric wire broken string fixation is to adopt capacitance method or wave reflection method to determine the break point scope, and then by sound detection or inductive method, Accurate Measurement goes out the position of break point.Because current methods is that segmentation is measured, not directly to measure, cause complex operation when measuring, both consuming time, also waste of manpower, material resources, and existing electric wire broken string orientator exists background noise large, is difficult to the audio frequency variable signal of break point front and back is separated from background noise, so it is low to exist measuring accuracy, the shortcoming that error is large.
The utility model content
The purpose of this utility model is to address the above problem and is not enough, and a kind of have break point, sound and light of alarm are provided, and background noise is low, and the break point error is less than 5mm, and measuring accuracy is high, the high-precision low-noise electric wire broken string orientator of applied range.
The technical solution of the utility model is achieved in that
A kind of high-precision low-noise electric wire broken string orientator, its characteristics are this orientator by the 3kHz audio signal source, capacitance type sensor, broken string received signal power amplifier, disconnection signal comparer, modulation signal generator and the 12V electric power generating composition that organically are electrically connected together, and wherein said 3kHz audio signal source is made of mutual electrical connection 3kHz audio signal generator, preamplifier state signal power amplifier and output transformer together; Described capacitance type sensor is made of metal wire cover, the copper strip shielding integument that is coated on the insulating coating on this metal wire cover surface and is coated on this insulating coating surface, the copper strip shielding integument ground connection of described capacitance type sensor, the metal wire of described capacitance type sensor is arranged with the disconnection signal output terminal; Described broken string received signal power amplifier is made of prime amplifier and power amplifier, and described prime amplifier is provided with the disconnection signal input end, and the disconnection signal output terminal of this disconnection signal input end and capacitance type sensor is electrically connected.
Further, the output transformer of described 3kHz audio signal source is provided with high resistant shelves output K1 and low-resistance shelves output K2.
Again further, the metal wire of described capacitance type sensor cover is cylindrical metal tube; Perhaps, the metal wire of described capacitance type sensor cover is for being the metallic sheath of letter " U " shape.
The beneficial effects of the utility model:
(1) this instrument has sound, the light warning function of break point, and background noise is low.The sampling of employing condenser type, and the metal tube of sensor or U-shaped metal device have good screen layer and ground connection, reduces outside space and disturb, and makes background noise reduce 20-30db, it is very clear that break point place sound and optic signal is changed, and then can improve significantly the precision of measurement.
(2) the break point error is less than 5mm.Sensor receives sound and the decibel meter that signal is 3kHz and shows (light) high level before break point, crossed break point, the modulation signal generator that the comparer that signal forms through LM358 and LM556 form makes the immediately transition of sound of the 3khz that instrument sends become the modulation signal sound of " ticking-tick-tick ", sound variation is clear, decibel meter shows that (light) becomes low level from high level immediately, so the break point error is less than 5mm.
(3) applied range.Be applicable to unshielded control cables and general polycore cable and cotton covered wire.Being specially adapted to the following electric heating insulated wire break point of silicon rubber electrothermal wire diameter 0.1mm differentiates.
(4) instrument has short-circuit protection function.Power amplifier level+20V ,-20V power supply are connected in series respectively 10 Ω .5W resistance and make the simple short-circuit protection of circuit, short circuit when preventing from testing and damage instrument.
(5) break point has relay contact output.Line design electric wire when broken string drive the actuating of relay, the output pair of contact is selected for the user.
Description of drawings
Fig. 1 is electrical equipment principle general diagram of the present utility model.
Fig. 2 is signal plate theory diagram of the present utility model.
Fig. 3 is the circuit theory diagrams of 3kHz audio signal generator of the present utility model.
Fig. 4 is the circuit theory diagrams of disconnection signal comparer of the present utility model.
Fig. 5 is the circuit theory diagrams of modulation signal generator of the present utility model.
Fig. 6 is the cross section structure synoptic diagram of scheme one capacitance type sensor of the present utility model.
Fig. 7 is the cross section structure synoptic diagram of scheme two capacitance type sensors of the present utility model.
Embodiment
Extremely shown in Figure 5 such as Fig. 1, a kind of high-precision low-noise electric wire broken string orientator described in the utility model, this orientator is made of the 3kHz audio signal source 1, capacitance type sensor 2, broken string received signal power amplifier 3, disconnection signal comparer 4, modulation signal generator 5 and the 12V power supply 6 that organically are electrically connected together, wherein
As shown in Figure 1, described 3kHz audio signal source 1 is made of mutual electrical connection 3kHz audio signal generator 11, preamplifier state signal power amplifier 12 and output transformer 13 together, wherein the circuit theory of 3kHz audio signal generator 11 as shown in Figure 3, prior art utilizations by 3kHz audio signal generator 11, so its principle process is not elaborated.Different for the capacitance that adapts to tested wire, as shown in Figure 1, the output transformer 13 of described 3kHz audio signal source 1 is provided with high resistant shelves output K1 and low-resistance shelves output K2, and when surveying long electric wire, switch spanner is to the K1 position, and during survey weak point electric wire, then pulls to the K2 position.
Such as Fig. 1, Fig. 6 or shown in Figure 7, described capacitance type sensor 2 by metal wire cover 21, be coated on the copper strip shielding integument 23 that this metal wire overlaps the insulating coating 22 on 21 surfaces and be coated on these insulating coating 22 surfaces and consist of, copper strip shielding integument 23 ground connection of described capacitance type sensor 2 are disturbed to reduce background noise.The metal wire cover 21 of described capacitance type sensor 2 is provided with disconnection signal output terminal 24.During test, tested electric wire 7 passes capacitance type sensor 2, and the output line of a termination 3kHz signal output transformer 13 of this electric wire 7, and the other end ground connection of this electric wire 7 to reduce background interference, makes test more accurate.
As shown in Figure 1, described broken string received signal power amplifier 3 is made of prime amplifier 31 and power amplifier 32, described prime amplifier 31 is provided with disconnection signal input end 33, and this disconnection signal input end 33 is electrically connected with the disconnection signal output terminal 24 of capacitance type sensor 2.
In order to satisfy multi-form electric wire, as shown in Figure 6, the metal wire cover 21 of described capacitance type sensor 2 can be cylindrical metal pipe structure, also can be as shown in Figure 7, and the metal wire of described capacitance type sensor 2 cover 21 is for being the metallic sheath structure of letter " U " shape.
Principle of work of the present utility model is roughly as follows: as shown in Figure 1, the 3kHz sound signal is connected to electric wire one end of broken string, pass capacitance type sensor 2 signals, by the capacitive coupling between electric wire and sampler, transfer to the disconnection signal input end 33 of prime amplifier 31 with concentric cable, amplify through preamplifier state signal power amplifier 12, make loudspeaker send the continuous sound of 3kHz, level indicator is all luminous.When the pulling tested wire arrives fracture site, signal opens circuit, signal weakens by the signal that capacitance type sensor 2 inputs to broken string received signal power amplifier 3, and the continuous sound of 3kHz greatly reduces, and level indicator is luminous to be greatly reduced, at this moment, disconnection signal comparer LM358 reverses immediately, and modulation signal is sent in the oscillator work that LM556 is formed, little loudspeaker sends the sound of " ticking-tick-tick ", and this moment, the exit of capacitance type sensor 2 was exactly break point.
Claims (4)
1. high-precision low-noise electric wire broken string orientator, it is characterized in that: this orientator is made of the 3kHz audio signal source (1), capacitance type sensor (2), broken string received signal power amplifier (3), disconnection signal comparer (4), modulation signal generator (5) and the 12V power supply (6) that organically are electrically connected together, wherein
Described 3kHz audio signal source (1) is made of mutual electrical connection 3kHz audio signal generator (11), preamplifier state signal power amplifier (12) and output transformer (13) together;
Described capacitance type sensor (2) is made of metal wire cover (21), the copper strip shielding integument (23) that is coated on the insulating coating (22) on this metal wire cover (21) surface and is coated on this insulating coating (22) surface, copper strip shielding integument (23) ground connection of described capacitance type sensor (2), the metal wire cover (21) of described capacitance type sensor (2) is provided with disconnection signal output terminal (24);
Described broken string received signal power amplifier (3) is made of prime amplifier (31) and power amplifier (32), described prime amplifier (31) is provided with disconnection signal input end (33), and this disconnection signal input end (33) is electrically connected with the disconnection signal output terminal (24) of capacitance type sensor (2).
2. described high-precision low-noise electric wire broken string orientator according to claim 1, it is characterized in that: the output transformer (13) of described 3kHz audio signal source (1) is provided with high resistant shelves outputs (K1) and low-resistance shelves outputs (K2).
3. described high-precision low-noise electric wire broken string orientator according to claim 1, it is characterized in that: the metal wire cover (21) of described capacitance type sensor (2) is cylindrical metal tube.
4. described high-precision low-noise electric wire broken string orientator according to claim 1, it is characterized in that: the metal wire cover (21) of described capacitance type sensor (2) is for being the metallic sheath of letter " U " shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320318891 CN203249986U (en) | 2013-06-04 | 2013-06-04 | Broken line positioning device with high precision and low noise for wires and cables |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320318891 CN203249986U (en) | 2013-06-04 | 2013-06-04 | Broken line positioning device with high precision and low noise for wires and cables |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203249986U true CN203249986U (en) | 2013-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320318891 Expired - Lifetime CN203249986U (en) | 2013-06-04 | 2013-06-04 | Broken line positioning device with high precision and low noise for wires and cables |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203249986U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106226651A (en) * | 2016-07-12 | 2016-12-14 | 国电南瑞科技股份有限公司 | A kind of overhead type indicating fault location terminal and voltage-to-ground measuring method |
| CN109557407A (en) * | 2018-12-21 | 2019-04-02 | 湖南金泰检测检验有限公司 | Earth conductor cable breakpoint of cable position detecting circuit and method |
-
2013
- 2013-06-04 CN CN 201320318891 patent/CN203249986U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106226651A (en) * | 2016-07-12 | 2016-12-14 | 国电南瑞科技股份有限公司 | A kind of overhead type indicating fault location terminal and voltage-to-ground measuring method |
| CN106226651B (en) * | 2016-07-12 | 2019-08-23 | 国电南瑞科技股份有限公司 | A kind of overhead type indicating fault positioning terminal and voltage-to-ground measurement method |
| CN109557407A (en) * | 2018-12-21 | 2019-04-02 | 湖南金泰检测检验有限公司 | Earth conductor cable breakpoint of cable position detecting circuit and method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131023 |
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| CX01 | Expiry of patent term |