CN204065015U - A kind of low-voltage cable Inner Defect Testing system - Google Patents

A kind of low-voltage cable Inner Defect Testing system Download PDF

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Publication number
CN204065015U
CN204065015U CN201420503848.1U CN201420503848U CN204065015U CN 204065015 U CN204065015 U CN 204065015U CN 201420503848 U CN201420503848 U CN 201420503848U CN 204065015 U CN204065015 U CN 204065015U
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CN
China
Prior art keywords
voltage
alterating
switch
transformer
control signal
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 - Fee Related
Application number
CN201420503848.1U
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Chinese (zh)
Inventor
林富洪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
State Grid Fujian Electric Power Co Ltd
Putian Power Supply Co of State Grid Fujian Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
State Grid Fujian Electric Power Co Ltd
Putian Power Supply Co of State Grid Fujian Electric Power Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, State Grid Fujian Electric Power Co Ltd, Putian Power Supply Co of State Grid Fujian Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201420503848.1U priority Critical patent/CN204065015U/en
Application granted granted Critical
Publication of CN204065015U publication Critical patent/CN204065015U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model relates to a kind of low-voltage cable Inner Defect Testing system, comprises 220kV AC power, the first switch, transformer, alterating and direct current pressure converter, resistance, inductance, high-voltage switch gear, voltage divider, coupling condenser, tested cable, oscillating voltage analyser, voltage detector, the first control signal wire, the second control signal wire.The utility model result is simple, utilizes series resonance principal to produce oscillating voltage, and reliably detect low-voltage cable inside whether defectiveness by analyzing oscillating voltage information, testing result is correctly reliable.

Description

A kind of low-voltage cable Inner Defect Testing system
Technical field
The utility model relates to electric device maintenance technology, more particularly, relates to a kind of low-voltage cable Inner Defect Testing system.
Background technology
Along with town site day is becoming tight, original built on stilts low-voltage circuit needs to carry out cable transmission of electricity, to vacate aboveground space for urban construction.If be embedded in the low-voltage cable defectiveness of underground, be in operation and insulation breakdown easily occur and short trouble or blast, both affected urban electricity supply, also impact pedestrian's personal safety on the ground.Before low-voltage cable comes into operation, need to detect low-voltage cable without inherent vice by electrical test means, normal reliable just can be bought in underground and put into operation.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, there is provided a kind of result simple, series resonance principal is utilized to produce oscillating voltage, reliable low-voltage cable inside whether defectiveness is detected, the correct low-voltage cable Inner Defect Testing system reliably of testing result by analyzing oscillating voltage information.
The technical solution of the utility model is as follows:
A kind of low-voltage cable Inner Defect Testing system, comprises 220kV AC power, the first switch, transformer, alterating and direct current pressure converter, resistance, inductance, high-voltage switch gear, voltage divider, coupling condenser, tested cable, oscillating voltage analyser, voltage detector, the first control signal wire, the second control signal wire;
First switch one end is connected with AC power first output terminal, and the first switch other end is connected with transformer first input end, and transformer second input end is connected with AC power second output terminal;
Alterating and direct current pressure converter has a pair input end, and the pair of output of transformer is connected in parallel with alterating and direct current pressure converter a pair input end respectively, the output terminal input end common ground that be connected corresponding to alterating and direct current pressure converter of transformer;
Another output terminal of alterating and direct current pressure converter and successively contact resistance, inductance, tested cable, tested cable, ground connection, high-voltage switch gear one end picks out from the junction of resistance and inductance, the direct ground connection of the high-voltage switch gear other end;
After voltage divider and coupling condenser are connected in parallel, its one end picks out from tested cable and inductance junction, and the other end is connected with voltage detector, the direct ground connection of voltage detector earth terminal;
Oscillating voltage analyser by the first control signal line traffic control first switch deciliter, by the second control signal line traffic control high-voltage switch gear deciliter, voltage detector is connected with oscillating voltage analyser by signal wire.
The beneficial effects of the utility model are as follows:
The utility model result is simple, utilizes series resonance principal to produce oscillating voltage, and reliably detect low-voltage cable inside whether defectiveness by analyzing oscillating voltage information, testing result is correctly reliable.
High voltage side of transformer ac voltage rectifier is that high direct voltage exports by described alterating and direct current pressure converter.
Described coupling condenser is in parallel with tested cable earth capacitance, regulates the electric capacity of whole system, makes the capacitance parameter of inductance parameters and whole system meet series resonance occurrence condition.
Described voltage divider converts amplitude oscillating voltage to low amplitude value oscillating voltage, then sends oscillating voltage analyser to through voltage detector, carries out signal analysis for oscillating voltage analyser, to judge low-voltage cable inside whether defectiveness.
Accompanying drawing explanation
Fig. 1 is general structure schematic diagram of the present utility model;
In figure: 1 is AC power, 2 is first switches, and 3 is transformers, 4 is alterating and direct current pressure converters, and 5 is resistance, and 6 is inductance, 7 is high-voltage switch gears, 8 is voltage dividers, and 9 is coupling condensers, and 10 is tested cables, 11 is oscillating voltage analysers, 12 is voltage detectors, and 13 is first control signal wires, and 14 is second control signal wires.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
As shown in Figure 1, low-voltage cable 10 Inner Defect Testing system, it is characterized in that, comprise 220kV AC power 1, first switch 2, transformer 3, alterating and direct current pressure converter 4, resistance 5, inductance 6, high-voltage switch gear 7, voltage divider 8, coupling condenser 9, tested cable 10, oscillating voltage analyser 11, voltage detector 12, first control signal wire 13, second control signal wire 14.
First switch 2 one end is connected with AC power 1 first output terminal, and first switch 2 other end is connected with transformer 3 first input end, and transformer 3 second input end is connected with AC power 1 second output terminal.
Alterating and direct current pressure converter 4 has a pair input end, and the pair of output of transformer 3 is connected in parallel with alterating and direct current pressure converter 4 a pair input end respectively, the output terminal input end common ground that be connected corresponding to alterating and direct current pressure converter 4 of transformer 3.
Another output terminal of alterating and direct current pressure converter 4 and successively contact resistance 5, inductance 6, tested cable 10, tested cable 10, ground connection, alterating and direct current pressure converter 4 one output terminals are connected with resistance 5 one end, resistance 5 other end is connected with inductance 6 one end, tested cable 10 one end is connected with inductance 6 other end, the direct ground connection of tested cable 10 other end.
High-voltage switch gear 7 one end picks out from the junction of resistance 5 and inductance 6, the direct ground connection of high-voltage switch gear 7 other end; After voltage divider 8 and coupling condenser 9 are connected in parallel, its one end picks out from tested cable 10 with inductance 6 junction, and the other end is connected with voltage detector 12, the direct ground connection of voltage detector 12 earth terminal.
Oscillating voltage analyser 11 by the first control signal wire 13 control the first switch 2 deciliter, by the second control signal wire 14 control high-voltage switch gear 7 deciliter, voltage detector 12 is connected with oscillating voltage analyser 11 by signal wire.
When the utility model field conduct uses, oscillating voltage analyser 11 sends to the first switch 2 order of closing a floodgate by the first control signal wire 13, and close the first switch 2, realizes coupling condenser 9 and the charging of tested cable 10 ground capacitance.To be charged full after, oscillating voltage analyser 11 sends separating brake order by the first control signal wire 13 to the first switch 2, opens the first switch 2.
After the 5 second time of interval, oscillating voltage analyser 11 sends to high-voltage switch gear 7 order of closing a floodgate by the second control signal wire 14, close high-voltage switch gear 7, inductance 6 and coupling capacitance, tested cable 10 ground capacitance generation series resonance produce oscillating voltage, voltage detector 12 sends the low amplitude value oscillatory voltage signals detected to oscillating voltage analyser 11, oscillating voltage analyser 11 pairs of low amplitude value oscillatory voltage signals are analyzed, to judge low-voltage cable 10 inside whether defectiveness.
The oscillating voltage analyser 11 that the utility model adopts is prior art, its voltage analysis carried out also is prior art, the utility model provides a kind of hardware system including oscillating voltage analyser 11, does not therefore repeat the principle of oscillating voltage analyser 11 herein.
Above-described embodiment is only used to the utility model is described, and is not used as restriction of the present utility model.As long as according to technical spirit of the present utility model, change above-described embodiment, modification etc. all will be dropped in the scope of claim of the present utility model.

Claims (1)

1. a low-voltage cable Inner Defect Testing system, it is characterized in that, comprise 220kV AC power, the first switch, transformer, alterating and direct current pressure converter, resistance, inductance, high-voltage switch gear, voltage divider, coupling condenser, tested cable, oscillating voltage analyser, voltage detector, the first control signal wire, the second control signal wire;
First switch one end is connected with AC power first output terminal, and the first switch other end is connected with transformer first input end, and transformer second input end is connected with AC power second output terminal;
Alterating and direct current pressure converter has a pair input end, and the pair of output of transformer is connected in parallel with alterating and direct current pressure converter a pair input end respectively, the output terminal input end common ground that be connected corresponding to alterating and direct current pressure converter of transformer;
Another output terminal of alterating and direct current pressure converter and successively contact resistance, inductance, tested cable, tested cable, ground connection, high-voltage switch gear one end picks out from the junction of resistance and inductance, the direct ground connection of the high-voltage switch gear other end;
After voltage divider and coupling condenser are connected in parallel, its one end picks out from tested cable and inductance junction, and the other end is connected with voltage detector, the direct ground connection of voltage detector earth terminal;
Oscillating voltage analyser by the first control signal line traffic control first switch deciliter, by the second control signal line traffic control high-voltage switch gear deciliter, voltage detector is connected with oscillating voltage analyser by signal wire.
CN201420503848.1U 2014-09-02 2014-09-02 A kind of low-voltage cable Inner Defect Testing system Expired - Fee Related CN204065015U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420503848.1U CN204065015U (en) 2014-09-02 2014-09-02 A kind of low-voltage cable Inner Defect Testing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420503848.1U CN204065015U (en) 2014-09-02 2014-09-02 A kind of low-voltage cable Inner Defect Testing system

Publications (1)

Publication Number Publication Date
CN204065015U true CN204065015U (en) 2014-12-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201420503848.1U Expired - Fee Related CN204065015U (en) 2014-09-02 2014-09-02 A kind of low-voltage cable Inner Defect Testing system

Country Status (1)

Country Link
CN (1) CN204065015U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110471020A (en) * 2019-08-26 2019-11-19 云南电网有限责任公司曲靖供电局 A kind of capacitance type potential transformer monitoring device with self diagnosis

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110471020A (en) * 2019-08-26 2019-11-19 云南电网有限责任公司曲靖供电局 A kind of capacitance type potential transformer monitoring device with self diagnosis

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20141231

Termination date: 20210902