CN2114166U - Non-contact voltage sensor for power cables - Google Patents
Non-contact voltage sensor for power cables Download PDFInfo
- Publication number
- CN2114166U CN2114166U CN 91230685 CN91230685U CN2114166U CN 2114166 U CN2114166 U CN 2114166U CN 91230685 CN91230685 CN 91230685 CN 91230685 U CN91230685 U CN 91230685U CN 2114166 U CN2114166 U CN 2114166U
- Authority
- CN
- China
- Prior art keywords
- resistance
- meet
- circuit
- output terminal
- relay
- 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.)
- Granted
Links
- 239000004020 conductor Substances 0.000 claims abstract description 18
- 239000003990 capacitor Substances 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 7
- 230000003321 amplification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model discloses a novel triphase non-contact voltage sensor for power cables, comprising a good conductor, an amplifying circuit, a comparison circuit, a control circuit and an output circuit. The good conductor is required to be clamped on the scarfskin of the triphase power cables. Thus, voltage signals in the power cables can be safely taken for judgement. The utility model has the advantages of simple structure, convenient installation and operation, high sensitivity and strong anti-jamming and selecting performance. The triphase non-contact voltage sensor for power cables is suitable for a wide voltage range (220V-8000V ) and is used for the status test of the high-voltage power cables.
Description
The utility model is to belong to electric power, electronics, signal detection technique field.
The state-detection of colliery high-voltage power cable is mainly carried out: 1, load condition, and promptly power cable has voltage, the judgement of electric current is arranged; 2, idling, promptly power cable has voltage, currentless judgement; 3, the judgement of single-phase earthing or short-circuit between conductors state.Carry out these status detection, at first will extract voltage, current signal, if obtain from voltage transformer (VT) or current transformer, it is very inconvenient and unsafe then coal mine to be got off to say so.At present, developed the contactless type current sensor that is used for colliery high-voltage power cable detection, can extract current signal safely and reliably, but safe and reliable extraction and judgement still do not have way to voltage signal.
The purpose of this utility model just provides a kind of contactless type voltage sensor novel, that be used for colliery high-voltage power cable state-detection, and it can extract the voltage signal in the power cable, and judge in the mine production run safely and reliably.Using never appears in this contactless type voltage sensor.
The utility model is made of a good conductor, amplifying circuit, comparator circuit, control circuit and output circuit.It is according to U=∫ L
D
The electric field that changes, the principle that causes different voltage to distribute in the field electrically isolates from ground and close power cable with a good conductor, and gets this good conductor voltage over the ground as output signal; The signal of this output signal in amplifying circuit follow and amplify after send comparator circuit, compare with a reference voltage, when power cable has voltage, comparator circuit output high level; When the power cable no-voltage, the comparator circuit output low level.If comparator circuit is output as high level, then make output circuit export a forward current through control circuit; If comparator circuit is output as low level, then make output circuit export an inverse current through control circuit.By the judgement of current direction, just knowing has no-voltage in the power cable.
This contactless type voltage sensor that is used for colliery power cable state-detection only needs its good conductor is stuck on the crust of three-phase power cable, just can extract the voltage signal in the power cable safely and reliably, and judge.This is because of its working current is a milliampere level, is easy to make the essential safe type product, and this is very important to the colliery.The utility model is simple in structure, and is highly sensitive, anti-interference and select performance strong, can be adapted to broad voltage range (220V～8000V), easy to install, can be widely used in the monitoring of working condition of power cable.
Accompanying drawing 1 is a good conductor structural representation of the present utility model.
Accompanying drawing 2 is an electric circuit diagram of the present utility model.
Accompanying drawing 3 is an output circuit wiring diagram of the present utility model.
Embodiment of the present utility model is described further in conjunction with the accompanying drawings.
According to U=∫ L
D
Changing electric field, the principle that causes different voltage to distribute in the field electrically isolates from ground with a good conductor 1, and is connected on the insulation sheath 3 of three-phase power cable 2; Good conductor can be iron, and good conductor 1 voltage is over the ground delivered to amplifying circuit 4 as output signal.
By amplifier A
1, A
2, resistance R
1～R
4The amplifying circuit 4 that is constituted is that good conductor 1 voltage signal is over the ground delivered to A
1"+" end, A
1"-" termination A
1Output terminal, A
1Output terminal through resistance R
1Meet A
2"+" end, A
2"-" end respectively through resistance R
2Ground connection is through adjustable resistance R
3Meet A
2Output terminal, A
2Output terminal through resistance R
4Meet the amplifier A in the comparator circuit 5
3"+" end.
By amplifier A
3, A
4, resistance R
5～R
15, diode D
1～D
4, triode T
1, comparator circuit 5 that capacitor C constituted, be with A
3"+" end and "-" end between the suitable D that connects
2With reversal connection D
1, A
3"-" end through resistance R
7After, respectively through resistance R
5Ground connection is through resistance R
6Meet V
c, A
3Output terminal through resistance R
8Meet T
1Base stage, V
cThrough resistance R
10Meet T
1Collector, at T
1Base stage and emitter between connecting resistance R
9, T
1Grounded emitter, T
1Collector respectively through resistance R
11, capacitor C ground connection, through resistance R
13Meet A
4"-" end, A
4"-" end and "+" end between the suitable D that connects
3With reversal connection D
4, A
4"+" end through resistance R
14After, respectively through R
2Ground connection is through R
15Meet V
C, A
4Output terminal through resistance R
16T in the connection control circuit 6
2Base stage.Here: D
1～D
4Play the amplitude limit effect, V
cThrough resistance R
5～R
7After the dividing potential drop at A
3"-" end one reference voltage, triode T be provided
1Be operated on off state, A
1, A
2, A
3, A
4Be four high guaily unit LM324.
By triode T
2, resistance R
16～R
18, diode D
5, control circuit 6 that relay J constituted, be with T
2Base stage respectively through resistance R
16Meet A
4Output terminal, through R
17Meet T
2Emitter, T
2Grounded emitter, V
cThrough relay J, resistance R
18After meet T
2Collector, and other and meet diode D in relay J
5Here: T
2Be to be operated on off state, relay J is JRW-3M.
By triode T
3, stabilivolt DW, resistance R
19～R
21, light emitting diode D
6, D
7, pull-up resistor R
LThe output circuit 7 that constitutes is with T
3Base stage be connected to resistance R
20Adjustable end, T
2Emitter through resistance R
21Ground connection; The plus earth of stabilivolt DW, negative pole are respectively through resistance R
20Ground connection is through resistance R
19Meet V
CT
3Collector meet a ' end and b end, V
cThrough suitable sending and receiving optical diode D
6Connect a end, through suitable sending and receiving optical diode D
7Connect b ' end, between a " end and b " end, meet pull-up resistor R
LWhen continuing the relay J adhesive, a, a " two ends and b, b " two ends are connected; When relay J disconnected, a, a " two ends and b, b " two ends were connected.V
cOperating voltage is+the 12V DC voltage.
When the three-phase power cable had voltage, the good conductor voltage-to-ground was through A
1Follow, A
2After the amplification, compare, make A with reference voltage
3Be output as high level, like this, T
1Conducting, the capacitor C discharge makes A
4Be output as high level, T
2Conducting, relay J adhesive, contact a ' and a " connect b ' and b and " connect light emitting diode D
7Bright, output forward current I on pull-up resistor
L
When three-phase power cable no-voltage, the good conductor voltage-to-ground is through A
1Follow A
2After the amplification, compare A with reference voltage
3Be output as low level, like this: T
1End, the capacitor C charging makes A
4Be output as " 0 ", T
2End, relay J disconnects, contact a and a " connects b and b and " connects light emitting diode D
6Bright, on pull-up resistor, export inverse current-I
L
Like this, according to output circuit 7 at pull-up resistor R
LOn current direction, it still is " nothing " that the voltage that goes out the three-phase power cable with regard to decidable " has ", for the state-detection of high-voltage power cable provides foundation reliably.
Claims (4)
1, a kind of novel three-phase power cable contactless type voltage sensor is made up of good conductor 1, amplifying circuit 4, comparator circuit 5, control circuit 6, output circuit 7, it is characterized in that:
A, the good conductor 1 that electrically isolates from ground are to be connected on the insulation sheath 3 of three-phase power cable 2, and its voltage over the ground is as the output signal big circuit 4 that veers away;
B, amplifying circuit 4 are by amplifier A
1, A
2, resistance R
1, R
2, R
3, R
4Constitute, wherein: the output of good conductor 1 meets A
1"+" end, A
1"-" termination A
1Output terminal, A
1Output terminal through resistance R
1Meet A
2"+" end, A
2"-" end respectively through resistance R
2Ground connection is through adjustable resistance R
3Meet A
2Output terminal, A
2Output terminal through resistance R
4Meet the amplifier A in the comparator circuit 5
3"+" end;
C, comparator circuit 5 are by amplifier A
3, A
4, resistance R
5～R
15, diode D
1～D
4, triode T
1, capacitor C constitutes, wherein: A
3"+" end hold with "-" between reversal connection D
1With the suitable D that connects
2, A
3"-" end through resistance R
7After, respectively through resistance R
5Ground connection is through resistance R
6Meet V
c, A
3Output terminal through resistance R
8Meet T
1Base stage, V
cThrough resistance R
10Meet T
1Collector, at T
1Base stage and emitter between connecting resistance R
9, T
1Grounded emitter, T
1Collector respectively through resistance R
11, capacitor C ground connection, through resistance R
13Meet A
4"-" end, A
4"-" end and "+" end between the suitable D that connects
3With reversal connection D
4, A
4"+" end through resistance R
14After, respectively through R
12Ground connection is through R
15Meet V
c, A
4Output terminal through resistance R
16T in the connection control circuit 6
2Base stage;
D, control circuit 6 are by triode T
2, resistance R
16～R
18, diode D
5, relay J constitutes, wherein: T
2Base stage respectively through resistance R
16Meet A
4Output terminal, through R
17Meet T
2Emitter, T
2Grounded emitter, V
cThrough relay J, resistance R
18After meet T
12Collector, other and meet diode D in relay J
5
E, output circuit 7 are by triode T
3, stabilivolt DW, resistance R
19, R
20, R
21, light emitting diode D
6, D
7, pull-up resistor R
LConstitute, wherein: T
3Base stage connecting resistance R
20Adjustable end, T
3Emitter through resistance R
21Ground connection, the plus earth of stabilivolt DW, negative pole is respectively through resistance R
20Ground connection is through resistance R
19Meet V
c, T
3Collector meet the end of a ' and b end, V
cThrough suitable sending and receiving light pipe D
6Connect a end, through suitable sending and receiving light pipe D
7Connect b ' end, meet pull-up resistor R between a " end and the b " end
L
2, voltage sensor according to claim 1 is characterized in that: good conductor is an iron.
3, voltage sensor according to claim 1 is characterized in that: when the relay J adhesive, a ', a " two ends and b ', b " two ends are connected; When relay J disconnected, a, a " two ends and b, b " two ends were connected.
4, according to claim 1 or 2 or 3 described voltage sensors, it is characterized in that: amplifier A
1, A
2, A
3, A
4Be four high guaily unit LM324, relay J is JRW-3M.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91230685 CN2114166U (en) | 1991-12-10 | 1991-12-10 | Non-contact voltage sensor for power cables |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91230685 CN2114166U (en) | 1991-12-10 | 1991-12-10 | Non-contact voltage sensor for power cables |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2114166U true CN2114166U (en) | 1992-08-26 |
Family
ID=4935991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91230685 Granted CN2114166U (en) | 1991-12-10 | 1991-12-10 | Non-contact voltage sensor for power cables |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2114166U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102061940A (en) * | 2010-11-30 | 2011-05-18 | 重庆梅安森科技股份有限公司 | Feed transducer for detecting differential mode leakage current of power cable |
| CN103718049A (en) * | 2011-03-25 | 2014-04-09 | 妍迪思公司 | High voltage measurement systems |
| CN105340026A (en) * | 2013-06-25 | 2016-02-17 | 3M创新有限公司 | Conductor assembly |
-
1991
- 1991-12-10 CN CN 91230685 patent/CN2114166U/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102061940A (en) * | 2010-11-30 | 2011-05-18 | 重庆梅安森科技股份有限公司 | Feed transducer for detecting differential mode leakage current of power cable |
| CN103718049A (en) * | 2011-03-25 | 2014-04-09 | 妍迪思公司 | High voltage measurement systems |
| CN103718049B (en) * | 2011-03-25 | 2016-01-13 | 妍迪思公司 | High voltage measuring system |
| CN105340026A (en) * | 2013-06-25 | 2016-02-17 | 3M创新有限公司 | Conductor assembly |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |