CN203165136U - Cable shielding layer burglar alarm device - Google Patents
Cable shielding layer burglar alarm device Download PDFInfo
- Publication number
- CN203165136U CN203165136U CN 201320092774 CN201320092774U CN203165136U CN 203165136 U CN203165136 U CN 203165136U CN 201320092774 CN201320092774 CN 201320092774 CN 201320092774 U CN201320092774 U CN 201320092774U CN 203165136 U CN203165136 U CN 203165136U
- Authority
- CN
- China
- Prior art keywords
- snap ring
- cable
- burglar alarm
- emission
- alarm
- 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.)
- Expired - Lifetime
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- Burglar Alarm Systems (AREA)
Abstract
The utility model relates to a cable shielding layer burglar alarm device, comprising a transmitter, a transmitting snap ring, a receiving snap ring, a receiver, and an alarm device. The transmitting snap ring and the receiving snap ring are installed outside a cable. The transmitter is connected with the transmitting snap ring. The receiving snap ring is connected with the receiver and the alarm device in sequence. The transmitter transmits alternating current signals at a constant signal break-make ratio to the transmitting snap ring. Signals are coupled on a shielding layer of the cable through the transmitting snap ring. The receiving snap ring receives signals through the shielding layer and transmits the signals to the receiver. The receiver performs amplification, filtering, and A/D conversion process on the received signals, and determine whether the cable shielding layer is complete according to received signals. If yes, signals are displayed, and if not, signals are displayed and alarm signals are sent to the alarm device, and the alarm device gives out an alarm. Compared with the prior art, the alarm device is advantaged by being capable of realizing a burglar alarm function, having an adaptive function, simple structure, etc.
Description
Technical field
The utility model relates to a kind of electric network monitoring device, especially relates to a kind of cable shield burglar alarm.
Background technology
In recent years, along with the fast development of urban industryization, from the power house to urban and rural power grids, to the factory street, cable line obtained application more and more widely with its unique characteristics, played the irreplaceable effect of pole line in many occasions from power distribution station.In the suburb, the cable major part is all laid with direct-buried mode, steals cable so just for some lawless person and has brought opportunity, and the phenomenon of the stolen stripping of cable shield takes place often.
What is called on the construction of cable " shielding " comes down to a kind of measure that improves Electric Field Distribution.Cable conductor is by many stranded the forming of seal wire, easily forms air gap between it and the insulation course, and conductive surface is rough, can cause electric field to concentrate.Add the screen layer of one deck semiconductive material at conductive surface, the conductor equipotential of it and conductively-closed, and well contact with insulation course, thereby avoid between conductor and insulation course, shelf depreciation taking place.This one deck shielding is called internal shield again.
The screen layer of high voltage power cable generally all needs ground connection.Cable for 35kV and following electric pressure all adopts the two-terminal-grounding mode, this is because these cable great majority are triple cables, normally in service, the electric current summation that flows through three cores is zero, outside aluminium bag or metal screen layer, there is not magnetic linkage basically, like this, just do not have induced voltage basically at aluminium bag or metal screen layer two ends, do not flow through aluminium bag or metal screen layer so do not have induction current behind the two-terminal-grounding.The screen layer two-terminal-grounding can make and namely form a loop between screen layer and the earth, and after screen layer is damaged, the loop will disconnect, and only needs this loop of monitoring whether to be communicated with the integrality that can judge cable shield.
Summary of the invention
The purpose of this utility model be exactly provide a kind of in order to overcome the defective that above-mentioned prior art exists and realize anti-theft alarm function, have the self-adaptation regulatory function, simple in structure, use wide cable shield burglar alarm.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of cable shield burglar alarm, comprise transmitter, emission snap ring, receive snap ring, receiver and alarm, described emission snap ring and reception snap ring are installed in the cable outside, and described transmitter is connected with the emission snap ring, and described reception snap ring connects receiver and alarm successively.
Described transmitter comprises ac power input end mouth, current commutates filtering tank circuit, damped vibration loop and signal generator, described ac power input end mouth is connected with AC power, and described damped vibration loop connects current commutates filtering tank circuit, signal generator and emission snap ring respectively.
The signal break-make ratio of described transmitter is 60s: 1s.
Described receiver comprises prime amplifier, Digital Bandpass Filter, A/D converter, LCDs, CPU and function setting keyboard, one end of described prime amplifier is connected with the reception snap ring, the other end connects Digital Bandpass Filter, A/D converter and CPU successively, and described CPU connects LCDs, function setting keyboard, prime amplifier and alarm respectively.
Described Digital Bandpass Filter is digital narrow band filter.
Described emission snap ring and reception snap ring are installed on the same cable, and the spacing of emission snap ring and reception snap ring is 1～1.5m.
Described alarm comprises hummer and pilot lamp.
Compared with prior art, the utlity model has following advantage:
1) the utility model is monitored the size of this signal simultaneously by apply an ac current signal at cable shield, reaches the purpose of monitoring feeder cable screen layer integrality, realizes anti-theft alarm function;
2) the utility model can accurately be identified the reception signal amplitude, and regulates the gain multiple automatically, has the self-adaptation regulatory function;
3) the utility model is simple in structure, can be widely used in the transformer and distribution power station 10kV outlet cable under the various operating modes.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
Embodiment
As shown in Figure 1, a kind of cable shield burglar alarm, comprise transmitter 1, emission snap ring 2, receive snap ring 3, receiver 4 and alarm 5, described emission snap ring 2 and reception snap ring 3 are installed in the cable outside, described transmitter 1 is connected with emission snap ring 2, and described reception snap ring 3 connects receiver 4 and alarm 5 successively.
Described transmitter 1 comprises ac power input end mouth, current commutates filtering tank circuit 11, damped vibration loop 12 and signal generator 13, described ac power input end mouth is connected with the 220V AC power, and described damped vibration loop 12 connects current commutates filtering tank circuit 11, signal generator 12 and emission snap ring 2 respectively.
Described receiver 4 comprises prime amplifier 41, Digital Bandpass Filter 42, A/D converter 43, LCDs 44, CPU45 and function setting keyboard 46, one end of described prime amplifier 41 is connected with reception snap ring 3, the other end connects Digital Bandpass Filter 42, A/D converter 43 and CPU45 successively, and described CPU45 connects LCDs 44, function setting keyboard 46, prime amplifier 41 and alarm 5 respectively.Described Digital Bandpass Filter 42 is digital narrow band filter.Described LCDs 44 shows for the HBO160*160 liquid crystal display.Described alarm 5 comprises hummer and pilot lamp.
The principle of work of above-mentioned cable shield burglar alarm is: transmitter 1 is launched ac current signal to launching snap ring 2 with certain signal break-make ratio, couple a signal on the screen layer of cable by emission snap ring 2, receive snap ring 3 receptions through the signal behind the screen layer and send to receiver 4; Prime amplifier 41 in the receiver 4, Digital Bandpass Filter 42 and A/D converter 43 amplify successively to the received signal, send into CPU45 after filtering and the A/D conversion process, CPU45 identification signal amplitude and the automatic gain multiple of regulating prime amplifier carry out online setting by 46 pairs of alarming values of function setting keyboard simultaneously; CPU45 judges whether integrality of cable shield according to the signal that receives, if, then signal is transferred to LCDs 44 and shows, if not, then signal is shown, and to alarm 5 transmission alerting signals, alarm sends warning.
According to the automatic monitoring of one period working time and record is normal when using maximum reception value and minimum reception value, this device is arranged rational alarming value, cable shield timely sound and light alarm when destroyed is taking place.
The technical indicator of above-mentioned cable shield burglar alarm comprises:
1) the emission snap ring is converted by zero sequence current mutual inductor, and the mutual inductor internal diameter is got Φ 120mm according to on-the-spot maximum cable external diameter.
2) the emission snap ring is installed on the same cable with receiving snap ring, and spacing is 1～1.5m, and spacing is too small may to produce electromagnetic interference (EMI), influences measuring accuracy.
3) CPU is the MPS430 single-chip microcomputer, this single-chip microcomputer have perfect AD sampling interface and with the communication interface of host computer, circuit is succinctly reliable; The Digital Bandpass Filter of receiver adopts the LTC1067 digital filter of Linear Tech, and every frequency doubling attenuation is greater than 60db, and the frequency-selecting effect is splendid.
4) signal generator of transmitter adopts digital lock-in technique, and frequency stabilization does not have drift, and the break-make ratio that transmits is 60s: 1s.
5) transmitter and receiver are contained in the portable aluminum instrument container of 360 * a 140 * 300mm.
5) output power of transmitter is 10W, and output frequency is 144Hz, and break-make ratio is that 60S is disconnected: 1S is logical, and the response time is less than 1MS.
Above-mentioned cable shield burglar alarm is by the integrality of on-line monitoring cable shield, when cable is subjected to outside destroy, artificial robber cut, sent sound and light alarm during abnormality such as cable peeling, realizes anti-theft alarm function.This device can be identified the reception signal amplitude, and regulates the gain multiple automatically, have the self-adaptation regulatory function, and this device structure is simple, is convenient to safeguard, can be widely used in the transformer and distribution power station 10kV outlet cable under the various operating modes.
Claims (7)
1. cable shield burglar alarm, it is characterized in that, comprise transmitter, emission snap ring, receive snap ring, receiver and alarm, described emission snap ring and reception snap ring are installed in the cable outside, described transmitter is connected with the emission snap ring, and described reception snap ring connects receiver and alarm successively.
2. a kind of cable shield burglar alarm according to claim 1, it is characterized in that, described transmitter comprises ac power input end mouth, current commutates filtering tank circuit, damped vibration loop and signal generator, described ac power input end mouth is connected with AC power, and described damped vibration loop connects current commutates filtering tank circuit, signal generator and emission snap ring respectively.
3. a kind of cable shield burglar alarm according to claim 1 is characterized in that, the signal break-make ratio of described transmitter is 60s: 1s.
4. a kind of cable shield burglar alarm according to claim 1, it is characterized in that, described receiver comprises prime amplifier, Digital Bandpass Filter, A/D converter, LCDs, CPU and function setting keyboard, one end of described prime amplifier is connected with the reception snap ring, the other end connects Digital Bandpass Filter, A/D converter and CPU successively, and described CPU connects LCDs, function setting keyboard, prime amplifier and alarm respectively.
5. a kind of cable shield burglar alarm according to claim 4 is characterized in that, described Digital Bandpass Filter is digital narrow band filter.
6. a kind of cable shield burglar alarm according to claim 1 is characterized in that, described emission snap ring and reception snap ring are installed on the same cable, and the spacing of emission snap ring and reception snap ring is 1～1.5m.
7. a kind of cable shield burglar alarm according to claim 1 is characterized in that described alarm comprises hummer and pilot lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320092774 CN203165136U (en) | 2013-02-28 | 2013-02-28 | Cable shielding layer burglar alarm device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320092774 CN203165136U (en) | 2013-02-28 | 2013-02-28 | Cable shielding layer burglar alarm device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203165136U true CN203165136U (en) | 2013-08-28 |
Family
ID=49026303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320092774 Expired - Lifetime CN203165136U (en) | 2013-02-28 | 2013-02-28 | Cable shielding layer burglar alarm device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203165136U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3049384A1 (en) * | 2016-03-25 | 2017-09-29 | Swg-Ta | DEVICE FOR DETECTING MALFUNCTIONS OR FLIGHTS OF ELECTRIC CABLES, DETECTION SYSTEM AND DETECTION METHOD USING SUCH A SYSTEM |
-
2013
- 2013-02-28 CN CN 201320092774 patent/CN203165136U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3049384A1 (en) * | 2016-03-25 | 2017-09-29 | Swg-Ta | DEVICE FOR DETECTING MALFUNCTIONS OR FLIGHTS OF ELECTRIC CABLES, DETECTION SYSTEM AND DETECTION METHOD USING SUCH A SYSTEM |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130828 |