CN208174260U - A kind of current transformer circuit of open-circuit-protection - Google Patents
A kind of current transformer circuit of open-circuit-protection Download PDFInfo
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- CN208174260U CN208174260U CN201721846852.8U CN201721846852U CN208174260U CN 208174260 U CN208174260 U CN 208174260U CN 201721846852 U CN201721846852 U CN 201721846852U CN 208174260 U CN208174260 U CN 208174260U
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Abstract
A kind of current transformer circuit of open-circuit-protection, including the mutual inductor being linked into gauze, the mutual inductor has the first output end and second output terminal, and first output end and second output terminal are connected with load；Protection circuit is also connected between first output end and second output terminal, the protection circuit includes the voltage-stabilizing device of multiple concatenations.The utility model is not necessarily to external auxiliary power supply power supply, of simple structure and low cost.
Description
Technical field
The utility model relates to current transformer technical field, especially a kind of current transformer circuit of open-circuit-protection.
Background technique
Current transformer is that primary side high current is converted into secondary side low current to assist surveying according to electromagnetic induction principle
The instrument of amount, it is very widely used in the power system or in instrument and equipment.But the if secondary pole of current transformer
It opens a way, primary current will be completely used for excitation, iron core can be made seriously to be saturated, and the magnetic flux of alternation will induction on secondary coil
Very high voltage out, peak value act on secondary coil and secondary circuit up to several kilovolts of even volts up to ten thousand, high voltages, will
The insulation of the safety or even coil that seriously threaten personal safety and equipment is burnt out because of overheat, and protection system may be because of no current
And it is unable to faults.
For this problem, the prior art increases protection circuit in the output end of current transformer, and protection philosophy is all
Using the reaction movement after detecting rising limitation voltage, it is shorted secondary loop, these protection circuits usually require active power supply,
Correlation detecting circuit is further related to, causes circuit structure complicated.
Utility model content
The utility model provides a kind of current transformer circuit of open-circuit-protection, is not necessarily to external auxiliary power supply power supply, structure
Simply, low in cost.
The utility model provides a kind of current transformer circuit of open-circuit-protection, including the mutual inductor being linked into gauze,
The mutual inductor has the first output end and second output terminal, and first output end and second output terminal are connected with load；
Protection circuit is also connected between first output end and second output terminal, the protection circuit includes the pressure stabilizing of multiple concatenations
Device.
Preferably, the voltage-stabilizing device includes multiple positive first diodes concatenated and multiple the two or two reversely concatenated
The first diode of pole pipe, multiple positive concatenations forms positive voltage regulator circuit, and multiple the second diodes reversely concatenated are formed instead
To voltage regulator circuit, the both ends of positive voltage regulator circuit and reversed voltage regulator circuit respectively with the first output end and second output terminal phase
Even.
Preferably, also access has indicating circuit, the indicating circuit packet between first output end and second output terminal
Third current-limiting resistance, third diode, third voltage-stabiliser tube and indicator light are included, first output terminates the one of third current-limiting resistance
End, the other end third diode cathode of third current-limiting resistance, third diode cathode connect third regulator tube negative, third pressure stabilizing
Pipe anode connects indicator light one end, another termination second output terminal of indicator light；The breakdown voltage of the third voltage-stabiliser tube is less than protection
The limitation voltage that circuit is limited, and it is greater than normal voltage when mutual inductor works normally.
Preferably, the protection circuit include the first current-limiting resistance, the first voltage-stabiliser tube, the first triode, first diode,
Second current-limiting resistance, the second voltage-stabiliser tube, the second triode and the second diode；One the first output of termination of the first current-limiting resistance
End, the first regulator tube negative of another termination, the first voltage-stabiliser tube anode connect the first transistor base, and the first transistor collector connects the
One output end, the first transistor emitter connect first diode anode, and the cathode of first diode connects second output terminal；Second limit
One termination second output terminal of leakage resistance, the second regulator tube negative of another termination, the second voltage-stabiliser tube anode connect the second triode base
Pole, the second transistor collector connect second output terminal, and the second transistor emitter connects the second diode cathode, the second diode
Cathode connects the first output end.
Preferably, also access has indicating circuit, the indicating circuit packet between first output end and second output terminal
Third current-limiting resistance, third diode, third voltage-stabiliser tube and indicator light are included, first output terminates the one of third current-limiting resistance
End, the other end third diode cathode of third current-limiting resistance, third diode cathode connect third regulator tube negative, third pressure stabilizing
Pipe anode connects indicator light one end, another termination second output terminal of indicator light；The breakdown voltage of the third voltage-stabiliser tube is less than protection
The limitation voltage that circuit is limited, and it is greater than normal voltage when mutual inductor works normally.
Preferably, the load is combined connection box, line bank, measuring device or relay protection device.
In the utility model, it is also connected with protection circuit between the first output end and second output terminal of mutual inductor, protects
Protection circuit includes the voltage-stabilizing device of multiple concatenations, and voltage-stabilizing device itself does not need external power supply power supply, after second open circuit, port
Voltage rises, but can be limited by voltage-stabilizing device, and secondary voltage is also just limited in limitation voltage range, with protection load not by
Damage.The utility model, as protection circuit, is not necessarily to external auxiliary power supply power supply using voltage-stabilizing device, and structure is simple, at low cost
It is honest and clean.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the current transformer circuit of the open-circuit-protection of embodiment of the utility model；
Fig. 2 is a kind of structural schematic diagram of the protection circuit of embodiment of the utility model；
Fig. 3 is the structural schematic diagram of the protection circuit of the utility model another kind embodiment.
Specific embodiment
The utility model is described in further detail below by specific embodiment combination attached drawing.
The utility model embodiment provides a kind of current transformer circuit of open-circuit-protection, as shown in Figure 1 comprising access
To the mutual inductor 2 in gauze 1, the mutual inductor 2 has the first output end and second output terminal the two output terminals, and described the
One output end and second output terminal are connected with load 4, specifically, can be connected by intermediate conveyor route 3 with load 4.Mutually
Circuit signal in gauze is introduced into load 4 by sensor 2, and load 4 can be relevant measuring circuit, to measure in gauze 1
A certain parameter.
Protection circuit 5 is also connected between first output end and second output terminal, the protection circuit 5 includes multiple
The voltage-stabilizing device of concatenation, voltage-stabilizing device can use zener diode, triode or other passive voltage-stabilizing devices, by more
A voltage-stabilizing device concatenation, is limited in secondary voltage when open circuit in limitation voltage range, injury-free with protection load.
In one embodiment, as shown in Fig. 2, the voltage-stabilizing device includes 57 He of first diode of multiple positive concatenations
Multiple the second diodes 58 reversely concatenated, the second diode 58 are concatenated along a circuit direction, and the then edge of first diode 57
Contrary direction concatenation is concatenated with the second diode 58.The first diode 57 of multiple positive concatenations forms positive pressure stabilizing electricity
Road, multiple the second diodes 58 reversely concatenated form reversed voltage regulator circuit, and the two of positive voltage regulator circuit and reversed voltage regulator circuit
End is connected with the first output end and second output terminal respectively.
In normal operation, the port voltage of mutual inductor 2 should be the limitation voltage that remote protection circuit 5 is set.It is logical
The electric current very little of overprotection circuit 5, almost can be ignored, in this way, protecting circuit 5 that will not consume electric current, not influence mutual inductance
The precision of device 2 and other indexs do not form influence to protecting circuit 5 and normally measuring.If secondary open occurs for mutual inductor 2
The port voltage of Lu Hou, mutual inductor 2 rise, but can be limited by the diode of multiple concatenations, and secondary voltage is also just limited in
It within voltage processed, will not cause any harm to subsequent conditioning circuit, to play protective effect.
On the basis of the embodiment, as shown in Fig. 2, also access has finger between first output end and second output terminal
Showing circuit, the indicating circuit includes third current-limiting resistance 59, third diode 510, third voltage-stabiliser tube 511 and indicator light 512,
One end of the first output termination third current-limiting resistance 59,510 anode of other end third diode of third current-limiting resistance 59,
510 cathode of third diode connects 511 cathode of third voltage-stabiliser tube, and 511 anode of third voltage-stabiliser tube connects 512 one end of indicator light, indicator light
512 another termination second output terminals.Wherein, the breakdown voltage of the third voltage-stabiliser tube 511 is less than the limit that protection circuit 2 is limited
Voltage processed, and it is greater than normal voltage when mutual inductor 2 works normally.When mutual inductor 2 works normally, third is not achieved in port voltage
The breakdown limit value of voltage-stabiliser tube 511, indicator light 512 not can be lit, and indication circuit is normal.After open circuit, the port electricity of mutual inductor 2
Pressure is increased to limitation voltage, and third voltage-stabiliser tube 511 generates electric current by limitation voltage breakdown, and indicator light 512 shines, is designated as out
Road.User's open circuit is informed in this way, to prevent from causing danger, it is of course also possible to other by optocoupler special line notice
Facility informs CT open circuit or remote alarms etc..
In one embodiment, as shown in figure 3, the protection circuit 5 includes the first current-limiting resistance 51, the first voltage-stabiliser tube
53, the first triode 55, first diode, the 57, second current-limiting resistance 52, the second voltage-stabiliser tube 54, the second triode 56 and second
Diode 58；One the first output end of termination of the first current-limiting resistance 51, another termination 53 cathode of the first voltage-stabiliser tube, the first voltage-stabiliser tube
53 anodes connect 55 base stage of the first triode, and 55 collector of the first triode connects the first output end, and 55 emitter of the first triode connects
57 anode of first diode, the cathode of first diode 57 connect second output terminal；One termination second of the second current-limiting resistance 52 is defeated
Outlet, another termination 54 cathode of the second voltage-stabiliser tube, 54 anode of the second voltage-stabiliser tube connect 56 base stage of the second triode, the second triode 56
Collector connects second output terminal, and 56 emitter of the second triode connects 58 anode of the second diode, and the cathode of the second diode 58 connects
First output end.It protects circuit 5 to pass through the selection of internal component parameter, its limitation voltage limited can be set.
The port voltage of mutual inductor 2 should be much smaller than the limitation voltage of setting in normal operation.Pass through protection
The electric current very little of circuit 5, almost can be ignored, in this way, protecting circuit 5 that will not consume electric current, not influence the essence of mutual inductor 2
Degree and other indexs do not form influence to protecting circuit 5 and normally measuring.After if second open circuit occurs for mutual inductor 2, mutually
The port voltage of sensor 2 rises, but can be limited by protection circuit 5, and secondary voltage is also just limited within limitation voltage, will not
It causes any harm to subsequent conditioning circuit, to play protective effect.
On the basis of the embodiment, as shown in figure 3, also access has finger between first output end and second output terminal
Showing circuit, the indicating circuit includes third current-limiting resistance 59, third diode 510, third voltage-stabiliser tube 511 and indicator light 512,
One end of the first output termination third current-limiting resistance 59,510 anode of other end third diode of third current-limiting resistance 59,
510 cathode of third diode connects 511 cathode of third voltage-stabiliser tube, and 511 anode of third voltage-stabiliser tube connects 512 one end of indicator light, indicator light
512 another termination second output terminals.Wherein, the breakdown voltage of the third voltage-stabiliser tube 511 is less than the limit that protection circuit 2 is limited
Voltage processed, and it is greater than normal voltage when mutual inductor 2 works normally.When mutual inductor 2 works normally, third is not achieved in port voltage
The breakdown limit value of voltage-stabiliser tube 511, indicator light 512 not can be lit, and indication circuit is normal.After open circuit, the port electricity of mutual inductor 2
Pressure is increased to limitation voltage, and third voltage-stabiliser tube 511 generates electric current by limitation voltage breakdown, and indicator light 512 shines, is designated as out
Road.User's open circuit is informed in this way, to prevent from causing danger, it is of course also possible to other by optocoupler special line notice
Facility informs CT open circuit or remote alarms etc..
In one embodiment, the load 4 can be combined connection box, line bank, measuring device or relay protection and set
It is standby.
The above content is combine specific embodiment further detailed description of the utility model, and it cannot be said that
The specific implementation of the utility model is only limited to these instructions.For the utility model person of an ordinary skill in the technical field
For, without departing from the concept of the premise utility, a number of simple deductions or replacements can also be made.
Claims (6)
1. a kind of current transformer circuit of open-circuit-protection, it is characterised in that：
Including the mutual inductor being linked into gauze, the mutual inductor has the first output end and second output terminal, and described first is defeated
Outlet and second output terminal are connected with load；It is also connected with protection circuit between first output end and second output terminal,
The protection circuit includes the voltage-stabilizing device of multiple concatenations.
2. the current transformer circuit of open-circuit-protection according to claim 1, it is characterised in that：
The voltage-stabilizing device includes multiple positive first diodes concatenated and multiple the second diodes reversely concatenated, Duo Gezheng
Positive voltage regulator circuit is formed to the first diode of concatenation, multiple the second diodes reversely concatenated form reversed voltage regulator circuit,
The both ends of positive voltage regulator circuit and reversed voltage regulator circuit are connected with the first output end and second output terminal respectively.
3. the current transformer circuit of open-circuit-protection according to claim 2, it is characterised in that：
Also access has indicating circuit between first output end and second output terminal, and the indicating circuit includes third current limliting electricity
Resistance, third diode, third voltage-stabiliser tube and indicator light, one end of the first output termination third current-limiting resistance, third current limliting
The other end third diode cathode of resistance, third diode cathode connect third regulator tube negative, and third voltage-stabiliser tube anode connects finger
Show lamp one end, another termination second output terminal of indicator light；The breakdown voltage of the third voltage-stabiliser tube is less than protection circuit and is limited
Limitation voltage, and be greater than mutual inductor work normally when normal voltage.
4. the current transformer circuit of open-circuit-protection according to claim 1, it is characterised in that：
The protection circuit includes the first current-limiting resistance, the first voltage-stabiliser tube, the first triode, first diode, the second current limliting electricity
Resistance, the second voltage-stabiliser tube, the second triode and the second diode；One the first output end of termination of the first current-limiting resistance, another termination
First regulator tube negative, the first voltage-stabiliser tube anode connect the first transistor base, and the first transistor collector connects the first output end, the
One transistor emitter connects first diode anode, and the cathode of first diode connects second output terminal；The one of second current-limiting resistance
Second output terminal, the second regulator tube negative of another termination are terminated, the second voltage-stabiliser tube anode connects the second transistor base, the two or three pole
Pipe collector connects second output terminal, and the second transistor emitter connects the second diode cathode, and the cathode of the second diode connects first
Output end.
5. the current transformer circuit of open-circuit-protection according to claim 4, it is characterised in that：
Also access has indicating circuit between first output end and second output terminal, and the indicating circuit includes third current limliting electricity
Resistance, third diode, third voltage-stabiliser tube and indicator light, one end of the first output termination third current-limiting resistance, third current limliting
The other end third diode cathode of resistance, third diode cathode connect third regulator tube negative, and third voltage-stabiliser tube anode connects finger
Show lamp one end, another termination second output terminal of indicator light；The breakdown voltage of the third voltage-stabiliser tube is less than protection circuit and is limited
Limitation voltage, and be greater than mutual inductor work normally when normal voltage.
6. the current transformer circuit of open-circuit-protection according to claim 1-5, it is characterised in that：
The load is combined connection box, line bank, measuring device or relay protection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721846852.8U CN208174260U (en) | 2017-12-26 | 2017-12-26 | A kind of current transformer circuit of open-circuit-protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721846852.8U CN208174260U (en) | 2017-12-26 | 2017-12-26 | A kind of current transformer circuit of open-circuit-protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208174260U true CN208174260U (en) | 2018-11-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721846852.8U Expired - Fee Related CN208174260U (en) | 2017-12-26 | 2017-12-26 | A kind of current transformer circuit of open-circuit-protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208174260U (en) |
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2017
- 2017-12-26 CN CN201721846852.8U patent/CN208174260U/en not_active Expired - Fee Related
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|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20181130 |