CN2872376Y - Off-circuit or short-circuit monitor - Google Patents
Off-circuit or short-circuit monitor Download PDFInfo
- Publication number
- CN2872376Y CN2872376Y CN 200620050066 CN200620050066U CN2872376Y CN 2872376 Y CN2872376 Y CN 2872376Y CN 200620050066 CN200620050066 CN 200620050066 CN 200620050066 U CN200620050066 U CN 200620050066U CN 2872376 Y CN2872376 Y CN 2872376Y
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- current transformer
- circuit
- monitoring device
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- electric energy
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Abstract
An open/short circuit monitoring device is used for monitoring the secondary side opening and short circuit of a current transformer in electric energy metering loop. Inside a metal housing, a signal coupling output device (1) and a signal induction receiver (2) are connected respectively to a secondary circuit of a current transformer of an electric energy metering loop (6) (outside the metal housing) in electromagnetic induction mode; output of the signal induction receiver (2) is connected electrically to input of a voltage amplifier (IV), and output of a open fault output circuit (4) is connected electrically to a three-phase four-wire metering monitor (5). The three-phase four-wire metering monitor (5) is adapted to the connection with the existing wires of electric energy metering loop, and can detect secondary side opening or short circuit fault of current transformer without needing extra external wires, thereby extending the monitoring range of protection against electricity stealing.
Description
Affiliated technical field
The utility model relates to the monitoring device of open circuit of Current Transformer Secondary side in a kind of alternating current loop and short circuit, and the secondary side that especially can monitor current transformer in the electric energy metrical loop is opened a way and the open circuit short circuit monitoring device of short circuit.
Background technology
At present, known application number 200420068270.8 utility model patents---three-phase and four-line measuring and monitoring device, whether normal to current return in the electric energy metrical, the influence metering is by stealing, is to flow through by measurement whether null current signal is decision making for three-phase current sum in the three-phase and four-line measuring and monitoring device current aperture and the difference of neutral line current.Electric current summation if flow through in its current aperture equals zero, and can judge that promptly the current return in the electric energy metrical is normal; Electric current summation if flow through in its current aperture is not equal to zero, and the three-phase and four-line measuring and monitoring device can judge that promptly the current return in the electric energy metrical is undesired, and the user is implemented to have a power failure.Having as the people in the mutual inductance type three-phase and four-line measurement loop of three-phase and four-line measuring and monitoring device and carrying out stealing, all open circuit or the short circuits of the secondary side output terminal of A, B, C phase current mutual inductor (Lha, LHb, LHc) and neutral line current mutual inductor (LHn), be zero at current transformer (Lha, LHb, LHc, LHn) secondary side output terminal outside output current so, the abnormal current signal can't be sent to the current aperture of three-phase and four-line measuring and monitoring device, the three-phase and four-line measuring and monitoring device can't be realized this electricity filching behavior, thereby can not prevent this electricity filching behavior; In addition again in having the direct-type three-phase and four-line measurement loop of three-phase and four-line measuring and monitoring device, the secondary side output terminal of current transformer (LHn) open circuit or short circuit, and then carry out this measuring apparatus of cross-over connection and carry out stealing, the secondary side of current transformer this moment (LHn) also can't be sent to the abnormal current signal current aperture of three-phase and four-line measuring and monitoring device, the three-phase and four-line measuring and monitoring device also can't be realized this type of electricity filching behavior, so, the three-phase and four-line measuring and monitoring device merely the difference by three-phase current sum and neutral line current whether null principle to the electric energy metrical current return work whether normally decision making, be not enough, it makes stays next bigger dead angle in the anti-electric theft monitoring scope of three-phase and four-line measuring and monitoring device in three-phase and four-line electric energy metrical current return.
Summary of the invention
In order to overcome the deficiency of staying next big dead angle in the existing anti-electric theft monitoring scope of three-phase and four-line measuring and monitoring device in three-phase and four-line electric energy metrical current return, the utility model provides a kind of open circuit short circuit monitoring device, should open a way short circuit monitoring device and application number 200420068270.8 utility model patents---the three-phase and four-line measuring and monitoring device is used, can not only guarantee that the original anti-stealing electricity function of three-phase and four-line measuring and monitoring device is constant, and can be in the electric energy metrical current return, Current Transformer secondary side output terminal open circuit or short circuit mode are carried out the wideer monitoring of behavior practical range of stealing and take precautions against.
The technical scheme that its technical matters that solves the utility model adopts is: in metal shell, the magnet ring coupling mechanism (L101) of signal coupling follower (1) and the outer middle current transformer (Lha of electric energy metrical current return (6) of metal shell, LHb, LHc, LHn) secondary circuit line electromagnetic induction connects, current transformer (LH1) in the induction of signal receiver (2) and the outer middle current transformer (Lha of electric energy metrical current return (6) of metal shell, LHb, LHc, LHn) secondary circuit line electromagnetic induction connects, current transformer (LH1) secondary side output terminal in the induction of signal receiver (2) is electrically connected with the both positive and negative polarity of voltage amplifier (IV) diode (D20) in the three-phase and four-line measuring and monitoring device (5) respectively, electric capacity (C105) input end in the open fault output circuit (4) and diode (D15) positive electrical of three-phase and four-line measuring and monitoring device (5) are connected, and the negative pole of diode (D103) is connected with diode (D15) negative electricity of three-phase and four-line measuring and monitoring device (5) in the open fault output circuit (4).
Induction of signal receiver (2) is electrically connected with electric capacity (C104) end by current transformer (LH1) secondary side one end in three-phase and four-line measuring and monitoring device (5) current sampling circuit (II), and current transformer (LH1) the secondary side other end, electric capacity (C104) other end and the utility model are electrically connected composition publicly.
Electric energy metrical current return (6) is by current transformer (Lha, LHb, LHc) secondary side output terminal one end respectively with electrical energy meter electricity fluid element (La, Lb, Lc) end is electrically connected, current transformer (Lha, LHb, LHc) the secondary side output terminal other end is electrically connected with a lead, this lead passes the magnet ring coupling mechanism (L101) of signal coupling follower (1) respectively, current transformer (LH1) center pit in the induction of signal receiver (2), with electrical energy meter electricity fluid element (La, Lb, Lc) other end is electrically connected, secondary side output terminal one end of neutral line current mutual inductor (LHn) is electrically connected with a lead, this lead passes the magnet ring coupling mechanism (L101) of signal coupling follower (1) respectively, current transformer (LH1) center pit in the induction of signal receiver (2) is electrically connected with the secondary side output terminal other end of neutral line current mutual inductor (LHn).
Signal coupling follower (1) sends the detection ac signal that frequency exceeds the 50HZ hundreds of times to electric energy metrical current return (6), this signal is given induction of signal receiver (2) by electric energy metrical current return (6) induction again, voltage amplifier (IV) by three-phase and four-line measuring and monitoring device (5) amplifies, detection signal after the amplification directly by three-phase and four-line measuring and monitoring device (5) according to the current transformer (Lha of its intensity size to electric energy metrical current return (6), LHb, LHc, LHn) whether juggling is made in short circuit to secondary circuit, after the amplification another partly detection signal send open fault output circuit (4), open fault output circuit (4) is according to the size of its detection signal current transformer (Lha to electric energy metrical current return (6), LHb, LHc, whether secondary circuit LHn) opens a way is made differentiation, sends the result to three-phase and four-line measuring and monitoring device (5) and handles.Normally carrying out under the situation of electric energy metrical, less from the detection signal that the voltage amplifier (IV) of three-phase and four-line measuring and monitoring device (5) is exported, three-phase and four-line measuring and monitoring device (5) is judged as in the electric energy metrical current return (6) and short circuit do not occur; Because exist detection signal, open fault output circuit (4) to be judged as open circuit, output low level signal do not appear in the electric energy metrical current return (6) again.When open fault occurring in the electric energy metrical current return (6), the detection signal that open fault output circuit (4) records is less or do not have, can send to three-phase and four-line measuring and monitoring device (5) and think that electric energy metrical current return (6) has the signal of open fault, promptly export high level signal, handle by three-phase and four-line measuring and monitoring device (5), cut off improper metering electricity consumption user's (8) power supply; When short trouble occurring in the electric energy metrical current return (6), the big detection signal of voltage amplifier (IV) output of three-phase and four-line measuring and monitoring device (5), directly handle by three-phase and four-line measuring and monitoring device (5), three-phase and four-line measuring and monitoring device (5) is judged as and short trouble occurs in the electric energy metrical current return (6) and can not normally measure, can cut off improper metering electricity consumption user's (8) power supply automatically, prevent to utilize the mode of whole open circuits of Current Transformer Secondary side or short circuit to carry out the behavior of stealing and further safeguard the electric energy metrical purpose of safety thereby reach.
The beneficial effects of the utility model are, be used in combination with three-phase and four-line measuring and monitoring device (5), can help three-phase and four-line measuring and monitoring device (5) to find that the Current Transformer Secondary side is all opened a way or the fault of short circuit, make three-phase and four-line measuring and monitoring device (5) anti-electric theft monitoring scope wideer, act on bigger, and on the basis of former electric energy metrical wiring, need not increase any new external connection again, user installation is simple.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is a functional-block diagram of the present utility model.
Fig. 2 is first embodiment circuit theory diagrams of the utility model.
Fig. 3 is second embodiment circuit theory diagrams of the utility model.
Fig. 4 is application number 200420068270.8 utility model patents---the three-phase and four-line measuring and monitoring device is wiring diagram partly.
1. signals coupling follower among the figure, 2. induction of signal receiver, 4. open fault output circuit, 5. three-phase and four-line measuring and monitoring device, 6. electric energy metrical current return, 7. direct supply, 8. user, II. the current sampling circuit of three-phase and four-line measuring and monitoring device, the voltage amplifier of IV. three-phase and four-line measuring and monitoring device.
Embodiment
In Fig. 2, the magnet ring coupling mechanism (L101) of signal coupling follower (1) and the outer middle current transformer (Lha of electric energy metrical current return (6) of metal shell, LHb, LHc, LHn) secondary circuit line electromagnetic induction connects, current transformer (LH1) in the induction of signal receiver (2) and the outer middle current transformer (Lha of electric energy metrical current return (6) of metal shell, LHb, LHc, LHn) secondary circuit line electromagnetic induction connects, current transformer (LH1) secondary side output terminal in the induction of signal receiver (2) is electrically connected with the both positive and negative polarity of voltage amplifier (IV) diode (D20) of three-phase and four-line measuring and monitoring device (5) respectively, electric capacity (C105) input end in the open fault output circuit (4) and diode (D15) positive electrical of three-phase and four-line measuring and monitoring device (5) are connected, and diode (D103) negative pole of open fault output circuit (4) is connected with diode (D15) negative electricity of three-phase and four-line measuring and monitoring device (5).
Signal coupling follower (1) is by triode (D101) collector, one end of electric capacity (C102) is electrically connected with an end of magnet ring coupling mechanism (L101), triode (D101) base stage, resistance (R101, R102) a end is connected with electric capacity (C103) positive electrical, triode (D101) emitter, one end of resistance (R103), one end of the other end of electric capacity (C102) and electric capacity (C101) is electrically connected, the other end of resistance (R101), the other end of electric capacity (C101), the other end of magnet ring coupling mechanism (L101) is electrically connected with direct supply (7), electric capacity (C103) negative pole, resistance (R102, R103) the other end is electrically connected composition with the utility model publicly.
Open fault output circuit (4) is by operational amplifier (IC5-3) in-phase input end, resistance (R104) end and electric capacity (C105) end are electrically connected, operational amplifier (IC5-3) inverting input, resistance (R105, R106) end and electric capacity (C106) end is electrically connected, operational amplifier (IC5-3) output terminal, anodal and resistance (R106) other end electrical connection of diode (D102), operational amplifier (IC5-4) inverting input, diode (D102) negative pole, resistance (R107) end is connected with electric capacity (C107) positive electrical, operational amplifier (IC5-4) in-phase input end and resistance (R108, R109) end is electrically connected, operational amplifier (IC5-4) output terminal and resistance (R110) end are electrically connected, resistance (R110) other end is connected with diode (D103) positive electrical, resistance (R104, R105, R107, R108) other end, electric capacity (C106) other end, electric capacity (C107) negative pole and the utility model are electrically connected publicly, and resistance (R109) other end and direct supply (7) are electrically connected to be formed.
Induction of signal receiver (2) is electrically connected with electric capacity (C104) end by current transformer (LH1) secondary side one end, and current transformer (LH1) the secondary side other end, electric capacity (C104) other end and the utility model are electrically connected composition publicly.
Current transformer (LH1) in the induction of signal receiver (2) is replaced by the current transformer (LH1) of the current sampling circuit (II) in the three-phase and four-line measuring and monitoring device (5).
In another embodiment of Fig. 3, the magnet ring coupling mechanism (L101) of signal coupling follower (1) is connected with the secondary circuit line electromagnetic induction of current transformer (LHn) in the metal shell electric energy metrical current return (6) outward, current transformer (LH1) in the induction of signal receiver (2) is connected with the secondary circuit line electromagnetic induction of current transformer (LHn) in the metal shell electric energy metrical current return (6) outward, current transformer (LH1) secondary side output terminal in the induction of signal receiver (2) is electrically connected with the both positive and negative polarity of voltage amplifier (IV) diode (D20) of three-phase and four-line measuring and monitoring device (5) respectively, electric capacity (C105) input end in the open fault output circuit (4) and diode (D15) positive electrical of three-phase and four-line measuring and monitoring device (5) are connected, and the negative pole of diode (D103) is connected with diode (D15) negative electricity of three-phase and four-line measuring and monitoring device (5) in the open fault output circuit (4).
Claims (2)
1. open circuit short circuit monitoring device, in metal shell, signal receiver and signal processing circuit are electrically connected, it is characterized in that: the magnet ring coupling mechanism (L101) of signal coupling follower (1) and the outer middle current transformer (Lha of electric energy metrical current return (6) of metal shell, LHb, LHc, LHn) secondary circuit line electromagnetic induction connects, current transformer (LHl) in the induction of signal receiver (2) and the outer middle current transformer (Lha of electric energy metrical current return (6) of metal shell, LHb, LHc, LHn) secondary circuit line electromagnetic induction connects, current transformer (LHl) secondary side output terminal in the induction of signal receiver (2) is electrically connected with the both positive and negative polarity of voltage amplifier (IV) diode (D20) of three-phase and four-line measuring and monitoring device (5) respectively, electric capacity (C105) input end in the open fault output circuit (4) and diode (D15) positive electrical of three-phase and four-line measuring and monitoring device (5) are connected, and the negative pole of diode (D103) is connected with diode (D15) negative electricity of three-phase and four-line measuring and monitoring device (5) in the open fault output circuit (4).
2. open circuit short circuit monitoring device according to claim 1, it is characterized in that: the secondary circuit line electromagnetic induction of current transformer (LHn) is connected in the outer electric energy metrical current return (6) of the magnet ring coupling mechanism (L101) of signal coupling follower (1) and metal shell, and the secondary circuit line electromagnetic induction of the middle current transformer (LHn) of electric energy metrical current return (6) outside the current transformer (LHl) in the induction of signal receiver (2) and the metal shell is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620050066 CN2872376Y (en) | 2006-02-15 | 2006-02-15 | Off-circuit or short-circuit monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620050066 CN2872376Y (en) | 2006-02-15 | 2006-02-15 | Off-circuit or short-circuit monitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2872376Y true CN2872376Y (en) | 2007-02-21 |
Family
ID=37740725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620050066 Expired - Fee Related CN2872376Y (en) | 2006-02-15 | 2006-02-15 | Off-circuit or short-circuit monitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2872376Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101937048A (en) * | 2010-07-27 | 2011-01-05 | 上海诺雅克电气有限公司 | Wire-break self diagnosis method and device for current transformer secondary coils |
| CN101545941B (en) * | 2008-03-28 | 2011-09-28 | 深圳市科陆电子科技股份有限公司 | Method and system for detecting failure of electric energy station loop |
| CN103176027A (en) * | 2011-12-26 | 2013-06-26 | 上海电科电器科技有限公司 | Connection detection method and device for secondary circuit of current detection unit |
| CN104330762A (en) * | 2014-11-21 | 2015-02-04 | 无锡韩光电器股份有限公司 | Line fault detection circuit for current transformer |
| CN109870667A (en) * | 2019-03-19 | 2019-06-11 | 中国石油大学(华东) | A kind of current transducer signal conditioning circuit with short circuit and breakage detection function |
-
2006
- 2006-02-15 CN CN 200620050066 patent/CN2872376Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101545941B (en) * | 2008-03-28 | 2011-09-28 | 深圳市科陆电子科技股份有限公司 | Method and system for detecting failure of electric energy station loop |
| CN101937048A (en) * | 2010-07-27 | 2011-01-05 | 上海诺雅克电气有限公司 | Wire-break self diagnosis method and device for current transformer secondary coils |
| CN101937048B (en) * | 2010-07-27 | 2012-10-03 | 上海诺雅克电气有限公司 | Wire-break self diagnosis method and device for current transformer secondary coils |
| CN103176027A (en) * | 2011-12-26 | 2013-06-26 | 上海电科电器科技有限公司 | Connection detection method and device for secondary circuit of current detection unit |
| CN103176027B (en) * | 2011-12-26 | 2015-05-13 | 上海电科电器科技有限公司 | Connection detection method and device for secondary circuit of current detection unit |
| CN104330762A (en) * | 2014-11-21 | 2015-02-04 | 无锡韩光电器股份有限公司 | Line fault detection circuit for current transformer |
| CN104330762B (en) * | 2014-11-21 | 2017-05-10 | 无锡韩光电器股份有限公司 | Line fault detection circuit for current transformer |
| CN109870667A (en) * | 2019-03-19 | 2019-06-11 | 中国石油大学(华东) | A kind of current transducer signal conditioning circuit with short circuit and breakage detection function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070221 Termination date: 20100215 |