CN2543072Y - Wire breakage monitor - Google Patents
Wire breakage monitor Download PDFInfo
- Publication number
- CN2543072Y CN2543072Y CN 02226747 CN02226747U CN2543072Y CN 2543072 Y CN2543072 Y CN 2543072Y CN 02226747 CN02226747 CN 02226747 CN 02226747 U CN02226747 U CN 02226747U CN 2543072 Y CN2543072 Y CN 2543072Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- unit
- sampling unit
- monitor according
- resistance
- 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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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
A circuit part of a disconnection monitor comprises a line sampling unit, a detection unit, an output unit and an execution unit. An isolation transformer is arranged between the line sampling unit and the detection unit. The line sampling unit and the detection unit are respectively connected with a primary side and a secondary side of the isolation transformer; the sine wave generating circuit of the secondary side provides excitation circuit. The detection unit comprises a conversion circuit which converts excitation current signal into voltage; a half wave rectification and second-order active filter circuit and comparative circuit; and a final direction which comprises a reverser, a LED, a triode and execution signals sent by the execution circuit of a relay. The utility model has the advantages of simple structure, small volume, low cost and low misoperation rate. The electrical isolation of the monitoring circuit and the being detected circuit perfectly protects the monitoring device, effectively avoids damages caused by coupling high pressure of the being detected line or lightning and can real-time monitor the being detected circuit.
Description
Technical field
The utility model relates to a kind of disconnection monitoring device, is meant a kind of electric power telecommunications transmission lines disconnection monitoring device especially.
Background technology
At electric power, telecommunication department, the normal power or the signal-transmitting cable of long distance of adopting connects control center and field apparatus, because transmission line is laid on outdoor, often cause transmission line to open circuit because of inclement weather or mishap accident, and the monitor staff often to be hard to tell when breaking down be that transmission cable opens circuit or field device failure, this has been appearred for commercially available cable break monitoring or warning product.But generally all there are following shortcoming in these disconnection monitorings or warning product: one, observation circuit and test line do not have electrical isolation, when test line coupled high voltage or lightning monitoring device easily are damaged, Chinese patent ZL01205566.2 number " electric power facilities anti-theft and fault alarm " disclosed device promptly belongs to this type; They are two years old, many monitoring devices can only just can be monitored when test line has a power failure or do not have working signal, can not monitor in real time, and Chinese patent ZL00229143.6 number " anti-theft alarm for power installation " disclosed content promptly is like this, and can not distinguish and whether normally have a power failure the rate of false alarm height.
Summary of the invention
It is small and exquisite, simple in structure and realize the electric power telecommunications transmission lines disconnection monitoring device of detecting unit and external circuit electrical isolation that the purpose of this utility model provides a kind of volume.
Designed a kind of disconnection monitoring device according to above-mentioned purpose, circuit part comprises the circuit sampling unit, accepts the detecting unit from the sampling unit signal, the alerting signal output unit of execution testing result, is provided with isolating transformer T between its circuit sampling unit and detecting unit
2Wherein, the circuit sampling unit is connected with the isolating transformer primary side, and detecting unit is connected with the isolating transformer secondary side, provides exciting current by the sine wave generating circuit that is connected with the isolating transformer secondary side to it.
Described sine wave generating circuit comprises operational amplifier U
1A, U
2A, resistance R
2, R
3And capacitor C
3, C
4, C
5The sine wave that produces through sine wave generating circuit is through operational amplifier U
1C, triode Q
1, Q
2Input to isolating transformer after the power amplification.And the circuit sampling unit is made up of the EMI circuit, comprises the LC filtering circuit that suppresses the circuit series mode noise, suppresses the filtering circuit of circuit common mode interference.The LC filtering circuit that suppresses the circuit series mode noise comprises the inductance L of mutual parallel connection
1, L
2Be connected across L
1, L
2Between capacitor C
8The filtering circuit that suppresses the circuit common mode interference comprises co-mode coil T
1And capacitor C
1, C
2Detecting unit comprises the change-over circuit that the exciting current conversion of signals is become voltage, change-over circuit is connected with the second-order active filter circuit with half-wave rectification, and half-wave rectification is connected comparator circuit to send the execution signal to executive circuit with the second-order active filter circuit with comparator circuit.Described change-over circuit comprises the resistance R that exciting current is converted to voltage signal
1, operational amplifier U
1DAnd resistance R
7, R
6, R
9Half-wave rectification and second-order active filter circuit comprise by operational amplifier U
2A, diode D
1The half-wave rectifying circuit of forming and by operational amplifier U
2B, resistance R
10, R
11, capacitor C
6, C
7The second-order active filter circuit of forming; Comparator circuit comprises hysteresis comparator U
2C, resistance R
14, R
15And regulator potentiometer RP
1In addition, executive circuit comprises reverser U
2D, LED, triode Q
2, relay J DQ
1
The utility model compared with prior art, volume simple in structure is little, cost is low, the misoperation rate is low.Because observation circuit and circuit-under-test electrical isolation, protected monitoring device perfectly, effectively avoided the damage that causes because of test line coupled high voltage or thunder and lightning, and can monitor in real time test line, improve and ensured managerial personnel's work efficiency.
Description of drawings
Accompanying drawing 1 is the utility model schematic block circuit diagram; Accompanying drawing 2 is circuit theory synoptic diagram of accompanying drawing 1; Accompanying drawing 3 is the sampling unit circuit theory synoptic diagram in the accompanying drawing 2; Accompanying drawing 4 is sine wave generating circuit principle schematic in the accompanying drawing 2; Accompanying drawing 5 is detection cell circuit principle schematic in the accompanying drawing 3.
Specific embodiments
With reference to each accompanying drawing.Mentality of designing of the present utility model is that test line is through EMI circuit and isolating transformer T
2Primary side connect; Secondary side at isolating transformer, the exciting current of alternation is provided to transformer by a sine-wave generator, and the size of the pull-up resistor of this exciting current and the isolating transformer primary side relation of being inversely proportional to, promptly the pull-up resistor of isolating transformer primary side is big more, and exciting current is more little; When with this exciting current after testing circuit conversion be voltage signal and a bias voltage (being test line voltage just often) when comparing, just can judge whether test line breaks, thereby reach the purpose of disconnection monitoring.
In described EMI circuit, inductance L
1, L
2And capacitor C
8The LC filtering circuit of forming can suppress the series mode noise in the circuit, and by co-mode coil T
1And capacitor C
1, C
2The filtering circuit of forming then can suppress the common mode interference in the circuit, form thus the EMI circuit can make monitor exempt the influence of external disturbance to testing result.The effect of sine wave generating circuit is to provide exciting current to isolating transformer, and its running parameter is T by formula
0=2 π √ C
4C
5R
3R
4Be provided with.In testing circuit, the exciting current process is by amplifier U
2AAnd resistance R
7, R
1, R
6, R
9The I/U change-over circuit of forming is converted to voltage signal, changes a DC voltage that is directly proportional with exciting current into through half-wave rectification and second-order active filter again, and this DC voltage is imported by amplifier U
2BWhether hysteresis comparator of forming and bias voltage relatively can detect test line and break.
When using at the scene, test line is via inductance L
1, L
2And capacitor C
8The differential mode interference of forming suppresses circuit and co-mode coil T
1, capacitor C
1, the common mode interference formed of C2 suppresses circuit and inserts isolating transformer T
2Primary side.At T
2Secondary side, by amplifier U
1A, U
1BAnd resistance R
2～4, capacitor C
3～5The sine wave that the sinusoidal wave circuit of forming produces is through amplifier U
1CWith triode Q
1, Q
3Give T after the power amplification
2Exciting current is provided.The size of the pull-up resistor of this exciting current and the isolating transformer primary side relation of being inversely proportional to is so the size of exciting current has reflected the resistance sizes of test line.This exciting current is through resistance R
1Be converted to voltage signal again through amplifier U
1DHomophase amplifies, and the voltage signal of amplification passes through U
2AAnd diode D
1The half-wave rectifying circuit and the amplifier U that form
2B, resistance R
10, R
11, capacitor C
6, C
7The second-order active filter circuit of forming changes a direct current voltage U into
iSuppose that circuit-under-test impedance just often is less than 10K Ω, then with T
2Primary side pull-up resistor U when being 10K Ω
iMagnitude of voltage U
0As hysteresis comparator U
2CCritical voltage, regulator potentiometer RP
1, make the negative input end voltage of comparer equal U
0At this moment, when pull-up resistor greater than 10K Ω (be circuit-under-test broken string), exciting current reduces, U
iLess than U
0, the comparer output low level is through phase inverter U
2DBecome high level after anti-phase, then LED light, triode Q
2Conducting, relay J DQ
1Alerting signal is sent in action.Otherwise when pull-up resistor during less than 10K Ω (being that test line is normal), exciting current increases, U
iGreater than U
0, comparer U
2CBe output as high level, through phase inverter U
2DBecome low level after anti-phase, then LED, not conducting of triode, relay J DQ
1Be failure to actuate.
Claims (8)
1, a kind of disconnection monitoring device, circuit part comprise the circuit sampling unit, accept the detecting unit from the sampling unit signal, the alerting signal output unit of execution testing result, it is characterized in that
Between circuit sampling unit and detecting unit, be provided with isolating transformer T
2
2, monitor according to claim 1, it is characterized in that the circuit sampling unit is connected with the isolating transformer primary side, detecting unit is connected with the isolating transformer secondary side, provides exciting current by the sine wave generating circuit that is connected with the isolating transformer secondary side to it.
3, monitor according to claim 2 is characterized in that described sine wave generating circuit comprises operational amplifier U
1A, U
2A, resistance R
2, R
3And capacitor C
3, C
4, C
5The sine wave that produces through sine wave generating circuit is through operational amplifier U
1C, triode Q
1, Q
2Input to isolating transformer after the power amplification.
4, monitor according to claim 1 and 2 is characterized in that described circuit sampling unit is made up of the EMI circuit, comprises the LC filtering circuit that suppresses the circuit series mode noise, suppresses the filtering circuit of circuit common mode interference.
5, monitor according to claim 4, the LC filtering circuit that it is characterized in that suppressing the circuit series mode noise comprises the inductance L of mutual parallel connection
1, L
2Be connected across L
1, L
2Between capacitor C
8The filtering circuit that suppresses the circuit common mode interference comprises co-mode coil T
1And capacitor C
1, C
2
6, monitor according to claim 1 and 2, it is characterized in that described detecting unit comprises the change-over circuit that the exciting current conversion of signals is become voltage, change-over circuit is connected with the second-order active filter circuit with half-wave rectification, half-wave rectification is connected with comparator circuit with the second-order active filter circuit, and comparator circuit sends the execution signal to executive circuit.
7, monitor according to claim 6 is characterized in that change-over circuit comprises the resistance R that exciting current is converted to voltage signal
1, operational amplifier U
1DAnd resistance R
7, R
6, R
9Half-wave rectification and second-order active filter circuit comprise by operational amplifier U
2A, diode D
1The half-wave rectifying circuit of forming and by operational amplifier U
2B, resistance R
10, R
11, capacitor C
6, C
7Two power filters of forming; Comparator circuit comprises hysteresis comparator U
2C, resistance R
14, R
15And regulator potentiometer RP
1
8, monitor according to claim 6 is characterized in that executive circuit comprises reverser U
2D, LED, triode Q
2, relay J DQ
1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02226747 CN2543072Y (en) | 2002-04-05 | 2002-04-05 | Wire breakage monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02226747 CN2543072Y (en) | 2002-04-05 | 2002-04-05 | Wire breakage monitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2543072Y true CN2543072Y (en) | 2003-04-02 |
Family
ID=33703687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02226747 Expired - Lifetime CN2543072Y (en) | 2002-04-05 | 2002-04-05 | Wire breakage monitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2543072Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101447672A (en) * | 2008-09-22 | 2009-06-03 | 陈甲标 | Novel full frequency spectrum electrical active filter |
| CN100510762C (en) * | 2004-07-07 | 2009-07-08 | 三菱电机株式会社 | Resolver malfunction diagnostic circuit |
| CN106771882A (en) * | 2017-01-23 | 2017-05-31 | 鲁东大学 | The offline inspection localization method and device of a kind of high-tension cable potential problems |
| CN107664716A (en) * | 2017-09-06 | 2018-02-06 | 常州同惠电子股份有限公司 | Contact inspection method and device based on AC impedance |
| CN112684243A (en) * | 2020-11-10 | 2021-04-20 | 国网宁夏电力有限公司 | Online monitoring equipment and system for state of lightning arrester |
-
2002
- 2002-04-05 CN CN 02226747 patent/CN2543072Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100510762C (en) * | 2004-07-07 | 2009-07-08 | 三菱电机株式会社 | Resolver malfunction diagnostic circuit |
| CN101447672A (en) * | 2008-09-22 | 2009-06-03 | 陈甲标 | Novel full frequency spectrum electrical active filter |
| CN106771882A (en) * | 2017-01-23 | 2017-05-31 | 鲁东大学 | The offline inspection localization method and device of a kind of high-tension cable potential problems |
| CN106771882B (en) * | 2017-01-23 | 2023-09-12 | 鲁东大学 | Off-line detection positioning method and device for potential problems of high-voltage cable |
| CN107664716A (en) * | 2017-09-06 | 2018-02-06 | 常州同惠电子股份有限公司 | Contact inspection method and device based on AC impedance |
| CN107664716B (en) * | 2017-09-06 | 2020-01-31 | 常州同惠电子股份有限公司 | Contact inspection method and device based on alternating current impedance |
| CN112684243A (en) * | 2020-11-10 | 2021-04-20 | 国网宁夏电力有限公司 | Online monitoring equipment and system for state of lightning arrester |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| C20 | Patent right or utility model deemed to be abandoned or is abandoned |