CN107785870A - A kind of current transformer and its secondary side open-circuit protecting device - Google Patents
A kind of current transformer and its secondary side open-circuit protecting device Download PDFInfo
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- CN107785870A CN107785870A CN201711108874.9A CN201711108874A CN107785870A CN 107785870 A CN107785870 A CN 107785870A CN 201711108874 A CN201711108874 A CN 201711108874A CN 107785870 A CN107785870 A CN 107785870A
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- 230000000087 stabilizing effect Effects 0.000 claims abstract description 147
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 239000003381 stabilizer Substances 0.000 claims description 81
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- General Physics & Mathematics (AREA)
- Protection Of Static Devices (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The present invention relates to a kind of current transformer and its secondary side open-circuit protecting device, current transformer includes current transformer body, open circuit detection module and short circuit protection module, open circuit detection module includes the first voltage stabilizing branch road for being connected to current transformer body secondary side, string is provided with the first Voltage stabilizing module on first voltage stabilizing branch road, first Voltage stabilizing module and the second voltage stabilizing branch circuit parallel connection are set, string is provided with divider resistance and the second Voltage stabilizing module on second voltage stabilizing branch road, the voltage stabilizing value of first Voltage stabilizing module is more than the voltage stabilizing value of the second Voltage stabilizing module, the control terminal of the partial pressure end control connection controlling switch of divider resistance, first Voltage stabilizing module controls connection short switch by controlling switch.When second open circuit, open circuit detection module is waken up, and is detected and is limited open-circuit voltage in safe range; utilize energy output drive signal caused by secondary loop of mutual inductor simultaneously; drive short circuit protection module action, the secondary output of short circuit current transformer, reliably protecting current transformer.
Description
Technical field
The present invention relates to a kind of current transformer and its secondary side open-circuit protecting device.
Background technology
Current transformer is a kind of equipment of electric current conversion, a high current is converted into secondary low current, for measuring
Instrument, protection device etc..Under normal running status, current transformer output voltage is very low, and secondary side is almost short-circuit, once
Secondary side is opened a way, and very high voltage will be produced at the both ends of its open circuit, is often caused spark discharge sound, is smoldered and burn
Phenomenon, too high voltage cause very big threat to equipment and the person.Meanwhile core loss can increase and then generate heat, even
Burn out insulation.
As shown in figure 1, being the overall structure of the current transformer with open circuit protecting function, current transformer 100 is main
It is made up of current transformer body 101, open circuit detection module 102 and short circuit protection module 103.Wherein, current transformer body
101：As conventional current transformer function, major function is that a high current is converted into secondary low current for it；Open circuit inspection
Survey module 102：It is connected with Current Transformer Secondary side, open circuit detection module 102 is used for whether detecting Current Transformer Secondary side
Open circuit, its major function be in current transformer normal work, its in a dormant state, not consumed energy, to Current Mutual Inductance
The secondary output of device is without influence；When second open circuit, voltage signal caused by Current Transformer Secondary side wakes up the module, and drives
Short circuit protection module 103 acts, reliably protecting current transformer；Short circuit protection module 103：Connect with Current Transformer Secondary side
Connect, it is mainly made up of short switch, and the major function of short circuit protection module 103 receives open circuit detection module 102 and provided
After drive signal, Current Transformer Secondary side is carried out by short circuit, reliably protecting current transformer by short switch action.
Therefore, for current transformer in normal work, in a dormant state, consumed energy, not right for open circuit detection module 102
Current Transformer Secondary is exported without influence, and the short switch of short circuit protection module 103 is off, equally to current transformer
Secondary output is without influence；When second open circuit, open circuit detection module 102 is waken up, and driving short circuit protection module 103 acts, short
Connect Current Transformer Secondary output, reliably protecting current transformer.
Current secondary side open circuit protecting equipment of current mutual inductor is typically independently of each current transformer arrangement, and needs outside
Power supply could normal work.Once externally fed abnormal protection device cannot normal work play a protective role, protect in addition
Connection contact between Current Transformer Secondary output and protection device be present, if connect independently of current transformer arrangement in device
Bad connection can not equally play a part of protection at point.Such as the Chinese patent application that application publication number is CN106532640A
A kind of secondary side open circuit protecting equipment of current mutual inductor is disclosed in file, and gives the physical circuit knot of the protection device
Structure, although the protection device can realize protection when Current Transformer Secondary side is opened a way, it is related to confession in the protection device
Power supply VCC, power supply VCC are the power supply of whole protection device, decide the normal operation of whole protection device, if
When power supply VCC failures or abnormal electrical power supply, whole protection device just loses defencive function.
The content of the invention
It is an object of the invention to provide a kind of current transformer, to solve when Current Transformer Secondary side open-circuit-protection fills
The problem of protection device can not realize open-circuit-protection during power supply abnormal electrical power supply in putting.Present invention simultaneously provides a kind of electric current
Transformer secondary side open-circuit protecting device.
To achieve the above object, the solution of the present invention includes following technical scheme.
Scheme one：This programme provides a kind of current transformer, including current transformer body and secondary side open-circuit-protection dress
Put, the secondary side open-circuit protecting device, which includes open circuit detection module and short circuit protection module, the short circuit protection module, to be included
The short-circuit protection branch road of current transformer body secondary side is connected to, string is provided with short switch, institute on the short-circuit protection branch road
Stating open circuit detection module includes being connected to the first voltage stabilizing branch road of current transformer body secondary side, on the first voltage stabilizing branch road
String is provided with the first Voltage stabilizing module, and first Voltage stabilizing module and the second voltage stabilizing branch circuit parallel connection are set, on the second voltage stabilizing branch road
String is provided with divider resistance and the second Voltage stabilizing module, and the voltage stabilizing value of first Voltage stabilizing module is more than the steady of second Voltage stabilizing module
Pressure value, the control terminal of partial pressure end control one controlling switch of connection of the divider resistance, the first Voltage stabilizing module output connect
One end of the controlling switch is connect, the other end control of the controlling switch connects the short switch；When current transformer two
During the open circuit of secondary side, the rise of secondary side output voltage, when voltage stabilizing value of the voltage more than the first Voltage stabilizing module, the first Voltage stabilizing module and
Second Voltage stabilizing module is open-minded, and being shared on divider resistance has the voltage that can make the controlling switch conducting, then, the control is opened
Closing and turn on, the voltage on the first Voltage stabilizing module is given to the short switch by the controlling switch, and driving short switch turns on,
Realize the open-circuit-protection of Current Transformer Secondary side.
The components such as Voltage stabilizing module, divider resistance and controlling switch are related only in secondary side open-circuit protecting device, are led to
Cross corresponding connection line to connect above-mentioned related component with Current Transformer Secondary side, in addition do not relate to
And other parts, that is to say, that in whole secondary side open-circuit protecting device and power supply need not be specially set, it is whole to protect
Open-circuit voltage of the operation of protection unit dependent on the secondary side both ends when secondary side is opened a way, using caused by current transformer itself
Energy drive short circuit protection module protection act, without externally fed can when secondary side is opened a way protective current transformer, keep away
Whole protection device loses defencive function when having exempted from because of power supply failure or abnormal electrical power supply.Meanwhile ensure that electric current is mutual
Sensor is without damage when secondary side is opened a way and does not produce high pressure, and then avoids threatening to equipment and the person.
Scheme two：On the basis of scheme one, the first voltage stabilizing branch route two mu balanced circuits composition in parallel, and first is steady
String is provided with the first voltage-stabiliser tube in volt circuit, and string is provided with the second voltage-stabiliser tube, the first voltage-stabiliser tube and the second voltage stabilizing on the second mu balanced circuit
The closure of pipe on the contrary, and the positive pole of the first voltage-stabiliser tube pass through the positive pole that connection line connects the second voltage-stabiliser tube, the first voltage stabilizing
The negative pole of pipe connects the negative pole of the second voltage-stabiliser tube by connection line, and the voltage stabilizing value of the first voltage-stabiliser tube and the second voltage-stabiliser tube is equal,
First voltage-stabiliser tube and the second voltage-stabiliser tube form first Voltage stabilizing module.
Scheme three：On the basis of scheme two, also string is provided with the first diode and the two or two on first mu balanced circuit
Pole pipe, first diode, the first voltage-stabiliser tube and the second diode are set gradually, and also string is provided with second mu balanced circuit
3rd diode and the 4th diode, the 3rd diode, the second voltage-stabiliser tube and the 4th diode are set gradually.
Scheme four：On the basis of scheme one, second Voltage stabilizing module is the 3rd voltage-stabiliser tube.
Scheme five：On the basis of scheme one to four any one scheme, it is single that the short circuit protection module also includes alarm
Member, the other end of the controlling switch also control the connection alarm unit.
Scheme six：On the basis of scheme five, the short circuit protection module includes relay unit, the controlling switch
Other end control connects the control coil of the relay unit, and the short switch is one of the relay unit normally opened
Contact, a normally-closed contact of the relay unit are arranged in the alarm unit, when the normally-closed contact disconnects, report
Alert unit output alarm signal.
Scheme seven：On the basis of scheme six, the control coil of the relay unit is configured with a reseting port, leads to
A reset signal can be applied to the reseting port by crossing outside, and short switch and alarm unit are resetted.
Scheme eight：This programme provides a kind of secondary side open circuit protecting equipment of current mutual inductor, including open circuit detection module and
Short circuit protection module, the short circuit protection module include being used for the short-circuit protection branch for being connected to current transformer body secondary side
Road, string is provided with short switch on the short-circuit protection branch road, and the open circuit detection module is included for being connected to current transformer
First voltage stabilizing branch road of body secondary side, string is provided with the first Voltage stabilizing module, the first voltage stabilizing mould on the first voltage stabilizing branch road
Block and the second voltage stabilizing branch circuit parallel connection are set, and string is provided with divider resistance and the second Voltage stabilizing module on the second voltage stabilizing branch road, described
The voltage stabilizing value of first Voltage stabilizing module is more than the voltage stabilizing value of second Voltage stabilizing module, the partial pressure end control connection of the divider resistance
The control terminal of one controlling switch, the first Voltage stabilizing module output connect one end of the controlling switch, the controlling switch
Other end control connect the short switch；When Current Transformer Secondary side is opened a way, the rise of secondary side output voltage, work as electricity
When pressing the voltage stabilizing value more than the first Voltage stabilizing module, the first Voltage stabilizing module and the second Voltage stabilizing module are open-minded, and being shared on divider resistance has
The voltage of the controlling switch conducting can be made, then, the controlling switch turns on, and the voltage on the first Voltage stabilizing module passes through institute
State controlling switch and be given to the short switch, driving short switch turns on, and realizes the open-circuit-protection of Current Transformer Secondary side.
Scheme nine：On the basis of scheme eight, the first voltage stabilizing branch route two mu balanced circuits composition in parallel, and first is steady
String is provided with the first voltage-stabiliser tube in volt circuit, and string is provided with the second voltage-stabiliser tube, the first voltage-stabiliser tube and the second voltage stabilizing on the second mu balanced circuit
The closure of pipe on the contrary, and the positive pole of the first voltage-stabiliser tube pass through the positive pole that connection line connects the second voltage-stabiliser tube, the first voltage stabilizing
The negative pole of pipe connects the negative pole of the second voltage-stabiliser tube by connection line, and the voltage stabilizing value of the first voltage-stabiliser tube and the second voltage-stabiliser tube is equal,
First voltage-stabiliser tube and the second voltage-stabiliser tube form first Voltage stabilizing module.
Scheme ten：On the basis of scheme nine, also string is provided with the first diode and the two or two on first mu balanced circuit
Pole pipe, first diode, the first voltage-stabiliser tube and the second diode are set gradually, and also string is provided with second mu balanced circuit
3rd diode and the 4th diode, the 3rd diode, the second voltage-stabiliser tube and the 4th diode are set gradually.
Scheme 11：On the basis of scheme eight, second Voltage stabilizing module is the 3rd voltage-stabiliser tube.
Scheme 12：On the basis of any one scheme of scheme eight to 11, the short circuit protection module also includes report
Alert unit, the other end of the controlling switch also control the connection alarm unit.
Scheme 13：On the basis of scheme 12, the short circuit protection module includes relay unit, and the control is opened
The other end control of pass connects the control coil of the relay unit, and the short switch is one of the relay unit
Normally opened contact, a normally-closed contact of the relay unit are arranged in the alarm unit, when the normally-closed contact disconnects
When, alarm unit output alarm signal.
Scheme 14：On the basis of scheme 13, the control coil of the relay unit is configured with a reset terminal
Mouthful, the reseting port can be given to apply a reset signal by outside, short switch and alarm unit are resetted.
Brief description of the drawings
Fig. 1 is the overall structure figure of the current transformer with open circuit protecting function；
Fig. 2 is the overall structure figure of current transformer provided by the invention；
Fig. 3 is a kind of specific circuit structure embodiment figure of current transformer provided by the invention.
Embodiment
Current transformer embodiment
The present embodiment provides a kind of current transformer with open circuit protecting function, as shown in Fig. 2 current transformer 100
It is made up of current transformer body 101 and secondary side open-circuit protecting device, wherein, secondary side open-circuit protecting device includes open circuit and examined
Survey module 102 and short circuit protection module 103.In the present embodiment, in order to embody globality, except current transformer body 101 it
Outside, open circuit detection module 102 and short circuit protection module 103 are built in current transformer 100, like this, just without outer
Portion connects, and certainly, can also use existing line connection.
Following elder generation simply introduces the function of each comprising modules.
Current transformer body 101：As conventional current transformer function, major function is that a high current is turned for it
Change secondary low current into.
Open circuit detection module 102：The module is built in inside current transformer 100, is connected with Current Transformer Secondary side,
Its major function is in current transformer normal work, and in a dormant state, consumed energy, not defeated to Current Transformer Secondary
Go out no influence；When second open circuit, voltage signal caused by Current Transformer Secondary side wakes up the module, while voltage signal quilt
The module is detected and is limited in the range of safe voltage, and open circuit detection module 102 utilizes energy driving caused by current transformer
Short circuit protection module 103 acts, reliably protecting current transformer.
Short circuit protection module 103：The module is built in inside current transformer 100, is connected with Current Transformer Secondary side,
Main to include a short-circuit protection branch road for being connected to current transformer body secondary side, string is provided with short on the short-circuit protection branch road
Way switch.The major function of short circuit protection module 103 is after receiving the drive signal that open circuit detection module 102 provides, by short
Current Transformer Secondary side is carried out short circuit, reliably protecting current transformer by way switch action.
Therefore, the general principle of the current transformer provided by the invention with open circuit protecting function is：In normal work
When used as ordinary electric current mutual-inductor, although open circuit detection module 102 and short circuit protection module 103 and current transformer two
Secondary side connection, but open a way detection module 102 in a dormant state, consumed energy, is not exported on Current Transformer Secondary without influence,
The short switch of short circuit protection module 103 is off, and equally Current Transformer Secondary is exported without influence；Current transformer
In course of normal operation, when second open circuit, open circuit detection module 102 is waken up, and is detected and is limited open-circuit voltage in safe model
In enclosing, and protected using energy (i.e. secondary side open-circuit voltage) driving protection module 103 caused by Current Transformer Secondary side itself
Shield act, the secondary output of short circuit current transformer, without externally fed can in second open circuit protective current transformer, avoid
Current transformer is damaged, and does not produce high pressure, and equipment and the person will not be threatened.
The structure of each comprising modules is described in detail below.
Because current transformer body 101 belongs to routine techniques, the present embodiment does not just illustrate.
Open circuit detection module 102 includes the first voltage stabilizing branch road for being connected to current transformer body secondary side, the first voltage stabilizing
String is provided with the first Voltage stabilizing module on branch road, and the first Voltage stabilizing module and the second voltage stabilizing branch circuit parallel connection set, gone here and there on the second voltage stabilizing branch road
Provided with divider resistance and the second Voltage stabilizing module, the voltage stabilizing value of the first Voltage stabilizing module is more than the voltage stabilizing value of the second Voltage stabilizing module, partial pressure
The control terminal of partial pressure end control one controlling switch of connection of resistance, the output of the first Voltage stabilizing module connect the one of the controlling switch
End, the other end control of the controlling switch connect the short switch in short circuit protection module 103.
In normal work, detection module 102 is opened a way in a dormant state, due to Current Transformer Secondary side output voltage
It is very low, it is impossible to reach the turning-on voltage of the first Voltage stabilizing module and the second Voltage stabilizing module, therefore, the partial pressure on divider resistance is 0, control
Switch processed is off state, the whole not consumed energy of detection module 102 of opening a way, Current Transformer Secondary is exported without influence,
Short switch in short circuit protection module 103 does not have control signal to turn it on, and therefore, short switch is also at off state,
Equally Current Transformer Secondary is exported without influence.In current transformer course of normal operation, when Current Transformer Secondary side is opened
Lu Shi, the rise of secondary side output voltage, when voltage stabilizing value of the voltage more than the first Voltage stabilizing module, the first Voltage stabilizing module opens limitation
Current Transformer Secondary output voltage peak, simultaneously as the voltage stabilizing value of the second Voltage stabilizing module is less than the first Voltage stabilizing module
Voltage stabilizing value, when voltage stabilizing value of the voltage more than the first Voltage stabilizing module, the first Voltage stabilizing module is open-minded, and the second Voltage stabilizing module is also open-minded,
And being shared on divider resistance has certain voltage, the voltage shared is the voltage stabilizing value and the second Voltage stabilizing module of the first Voltage stabilizing module
Voltage stabilizing value difference, selected, can made by the voltage stabilizing value to the first Voltage stabilizing module and the voltage stabilizing value of the second Voltage stabilizing module
Turned under the control of voltage of the controlling switch on divider resistance, then, after controlling switch conducting, on the first Voltage stabilizing module
Voltage is just given to short switch by controlling switch, driving short switch conducting, realizes that the open circuit of Current Transformer Secondary side is protected
Shield.
As shown in figure 3, a kind of specific circuit structure is provided, wherein, resistance R1 is divider resistance.Further, due to
Voltage on Current Transformer Secondary side is alternating voltage, in order that voltage equal energy on the first Voltage stabilizing module in forward and reverse
Enough there is the voltage of equidirectional, the first voltage stabilizing branch route that two mu balanced circuits are in parallel to be formed, and string is provided with the on the first mu balanced circuit
One voltage-stabiliser tube, it is voltage-stabiliser tube Z1, is gone here and there on the second mu balanced circuit and be provided with the second voltage-stabiliser tube, be voltage-stabiliser tube Z2, as shown in figure 3, voltage stabilizing
Pipe Z1 and voltage-stabiliser tube Z2 closure are on the contrary, equivalent to reverse parallel connection, and voltage-stabiliser tube Z1 positive pole is connected by connection line
Voltage-stabiliser tube Z2 positive pole, voltage-stabiliser tube Z1 negative pole connect voltage-stabiliser tube Z2 negative pole, voltage-stabiliser tube Z1 and voltage-stabiliser tube by connection line
Z2 voltage stabilizing value is equal, forms above-mentioned first Voltage stabilizing module.Moreover, in addition to voltage-stabiliser tube Z1, also gone here and there on the first mu balanced circuit
Provided with diode D1 and diode D2, diode D1, voltage-stabiliser tube Z1 and diode D2 are set gradually；In addition to voltage-stabiliser tube Z2,
Also string is provided with diode D3 and diode D4 on second mu balanced circuit, and diode D3, voltage-stabiliser tube Z2 and diode D4 are set gradually.
In addition, the second Voltage stabilizing module is the 3rd voltage-stabiliser tube, and the voltage-stabiliser tube Z3 in corresponding diagram 3, then, voltage-stabiliser tube Z3 voltage stabilizing
Voltage stabilizing value of the value less than voltage-stabiliser tube Z1 and voltage-stabiliser tube Z2.Controlling switch is the switching tube Q1 in Fig. 3, and resistance R1's divides press bond
Switching tube Q1 control terminal, from the foregoing, it can be understood that switching tube Q1 one end can receive voltage-stabiliser tube Z1 and Z2 voltage.
In the present embodiment, short switch is a relay KA1 normally opened contact, and switching tube Q1 other end control connects
Relay KA1 control coil.Short circuit protection module also includes alarm unit, and switching tube Q1 other end control connects the alarm
Unit, with reference to shown in Fig. 3, a relay KA1 normally-closed contact is alarm switch, is arranged in alarm unit.Touched when normally opened
During point closure, secondary side obtains short-circuit protection, while normally-closed contact will disconnect, alarm unit output alarm signal (ALARM),
Inform that user's secondary loop of mutual inductor has problem, and obtained reliably protecting.Moreover, as shown in figure 3, relay
KA1 control coil is configured with a reseting port, can apply a reset signal (RESET) to relay KA1 by outside,
Normally opened contact and normally-closed contact, i.e. short switch and alarm switch are resetted after current transformer short-circuit protection, realized
Reset and protection state.
Therefore, during current transformer normal work, because Current Transformer Secondary output voltage is very low, it is impossible to reach voltage stabilizing
Pipe Z1, Z2, Z3 turning-on voltage, therefore partial pressure is 0 on resistance R1, switching tube Q1 is off state, while voltage-stabiliser tube Z1, Z2,
Also no current is flowed through on Z3, and Current Transformer Secondary is exported without influence；In current transformer course of normal operation, when electric current is mutual
When sensor secondary side is opened a way, the rise of secondary side output voltage, when voltage exceedes voltage-stabiliser tube Z1 and Z2 voltage stabilizing value, voltage-stabiliser tube Z1
Limitation Current Transformer Secondary output voltage peak is opened with Z2, simultaneously as voltage-stabiliser tube Z3 voltage stabilizing value is less than voltage-stabiliser tube
Z1 and Z2 voltage stabilizing values, in order to ensure that switching tube acts, voltage-stabiliser tube Z3 voltage stabilizing value is set here than voltage-stabiliser tube Z1 and Z2 voltage stabilizing values
Low 4V, then, just there is about 4V voltage on resistance R1, switching tube Q1 conductings, the voltage on voltage-stabiliser tube Z1 and Z2 passes through switch
Pipe Q1 is exported to the relay KA1 of short circuit protection module 103 control coil, coil obtain it is electric after, relay KA1 normally opened contact
Closure, and then protective current transformer is without prejudice.
In addition, during current transformer normal work, KA1 normally opened contact is off, to Current Transformer Secondary
Output is without influence；After receiving the protection drive signal that open circuit detection module 102 provides, KA1 normally opened contact closure, by electric current
Transformer secondary circuit short-circuit, also, KA1 normally opened contact can be set as self-supporting switch, therefore only receive answering for outside
Guard mode can just reset after the signal of position.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.The base of the present invention
This thinking is above-mentioned basic scheme, for those of ordinary skill in the art, according to the teachings of the present invention, designs various changes
The model of shape, formula, parameter simultaneously need not spend creative work.It is right without departing from the principles and spirit of the present invention
The change, modification, replacement and modification that embodiment is carried out are still fallen within protection scope of the present invention.
Secondary side open circuit protecting equipment of current mutual inductor embodiment
The present embodiment provides a kind of secondary side open circuit protecting equipment of current mutual inductor, and the protection device can be independently of electric current
Transformer is individually produced and protected, due to describing Current Transformer Secondary side in detail in above-mentioned current transformer embodiment
Open-circuit protecting device, the present embodiment just no longer illustrate.
Claims (10)
1. a kind of current transformer, including current transformer body and secondary side open-circuit protecting device, the secondary side open circuit is protected
Protection unit includes open circuit detection module and short circuit protection module, and the short circuit protection module includes being connected to current transformer body
The short-circuit protection branch road of secondary side, string is provided with short switch on the short-circuit protection branch road, it is characterised in that the open circuit detects
Module includes being connected to the first voltage stabilizing branch road of current transformer body secondary side, and string is provided with first on the first voltage stabilizing branch road
Voltage stabilizing module, first Voltage stabilizing module and the second voltage stabilizing branch circuit parallel connection are set, and string is provided with partial pressure on the second voltage stabilizing branch road
Resistance and the second Voltage stabilizing module, the voltage stabilizing value of first Voltage stabilizing module is more than the voltage stabilizing value of second Voltage stabilizing module, described
The control terminal of partial pressure end control one controlling switch of connection of divider resistance, the first Voltage stabilizing module output connect the control
One end of switch, the other end control of the controlling switch connect the short switch；When Current Transformer Secondary side is opened a way,
Secondary side output voltage raises, when voltage stabilizing value of the voltage more than the first Voltage stabilizing module, the first Voltage stabilizing module and the second voltage stabilizing mould
Block is open-minded, and being shared on divider resistance has the voltage that can make the controlling switch conducting, then, the controlling switch conducting, the
Voltage on one Voltage stabilizing module is given to the short switch by the controlling switch, driving short switch conducting, realizes electric current
The open-circuit-protection of transformer secondary side.
2. current transformer according to claim 1, it is characterised in that the first voltage stabilizing branch route two mu balanced circuits
Parallel connection is formed, and string is provided with the first voltage-stabiliser tube on the first mu balanced circuit, and string is provided with the second voltage-stabiliser tube on the second mu balanced circuit, and first is steady
The closure of pressure pipe and the second voltage-stabiliser tube on the contrary, and the positive pole of the first voltage-stabiliser tube the second voltage-stabiliser tube is connected by connection line
Positive pole, the negative pole of the first voltage-stabiliser tube connect the negative pole of the second voltage-stabiliser tube, the first voltage-stabiliser tube and the second voltage-stabiliser tube by connection line
Voltage stabilizing value it is equal, the first voltage-stabiliser tube and the second voltage-stabiliser tube form first Voltage stabilizing module.
3. current transformer according to claim 2, it is characterised in that also string is provided with first on first mu balanced circuit
Diode and the second diode, first diode, the first voltage-stabiliser tube and the second diode are set gradually, second voltage stabilizing
Also string is provided with the 3rd diode and the 4th diode on circuit, the 3rd diode, the second voltage-stabiliser tube and the 4th diode according to
Secondary setting.
4. according to the current transformer described in claim 1-3 any one, it is characterised in that the short circuit protection module also wraps
Alarm unit is included, the other end of the controlling switch also controls the connection alarm unit.
5. current transformer according to claim 4, it is characterised in that the short circuit protection module includes relay list
Member, the other end control of the controlling switch connect the control coil of the relay unit, the short switch for it is described after
One normally opened contact of electric appliance unit, a normally-closed contact of the relay unit are arranged in the alarm unit, work as institute
When stating normally-closed contact disconnection, alarm unit output alarm signal.
6. a kind of secondary side open circuit protecting equipment of current mutual inductor, including open circuit detection module and short circuit protection module, described short
Road protection module includes being used for being connected to the short-circuit protection branch road of current transformer body secondary side, on the short-circuit protection branch road
String is provided with short switch, it is characterised in that the open circuit detection module includes being used to be connected to current transformer body secondary side
The first voltage stabilizing branch road, string is provided with the first Voltage stabilizing module on the first voltage stabilizing branch road, first Voltage stabilizing module and second steady
Branch circuit parallel connection is pressed to set, string is provided with divider resistance and the second Voltage stabilizing module, the first voltage stabilizing mould on the second voltage stabilizing branch road
The voltage stabilizing value of block is more than the voltage stabilizing value of second Voltage stabilizing module, and partial pressure end control one control of connection of the divider resistance is opened
The control terminal of pass, the first Voltage stabilizing module output connect one end of the controlling switch, the other end control of the controlling switch
System connects the short switch；When Current Transformer Secondary side is opened a way, secondary side output voltage rise, when voltage is more than first
During the voltage stabilizing value of Voltage stabilizing module, the first Voltage stabilizing module and the second Voltage stabilizing module are open-minded, shared on divider resistance have can make it is described
The voltage of controlling switch conducting, then, the controlling switch turns on, and the voltage on the first Voltage stabilizing module passes through the controlling switch
The short switch is given to, driving short switch turns on, and realizes the open-circuit-protection of Current Transformer Secondary side.
7. secondary side open circuit protecting equipment of current mutual inductor according to claim 6, it is characterised in that first voltage stabilizing
Branch route two mu balanced circuits composition in parallel, and string is provided with the first voltage-stabiliser tube on the first mu balanced circuit, goes here and there and sets on the second mu balanced circuit
Have the second voltage-stabiliser tube, the closure of the first voltage-stabiliser tube and the second voltage-stabiliser tube on the contrary, and the positive pole of the first voltage-stabiliser tube pass through connection
The positive pole of the voltage-stabiliser tube of connection second, the negative pole of the first voltage-stabiliser tube connect the negative pole of the second voltage-stabiliser tube by connection line, the
The voltage stabilizing value of one voltage-stabiliser tube and the second voltage-stabiliser tube is equal, and the first voltage-stabiliser tube and the second voltage-stabiliser tube form first Voltage stabilizing module.
8. secondary side open circuit protecting equipment of current mutual inductor according to claim 7, it is characterised in that first voltage stabilizing
Also string is provided with the first diode and the second diode on circuit, first diode, the first voltage-stabiliser tube and the second diode according to
Secondary setting, also string is provided with the 3rd diode and the 4th diode on second mu balanced circuit, the 3rd diode, second steady
Pressure pipe and the 4th diode are set gradually.
9. according to the secondary side open circuit protecting equipment of current mutual inductor described in claim 6-8 any one, it is characterised in that institute
Stating short circuit protection module also includes alarm unit, and the other end of the controlling switch also controls the connection alarm unit.
10. secondary side open circuit protecting equipment of current mutual inductor according to claim 9, it is characterised in that the short circuit is protected
Shield module includes relay unit, and the other end control of the controlling switch connects the control coil of the relay unit, institute
The normally opened contact that short switch is the relay unit is stated, a normally-closed contact of the relay unit is arranged on institute
State in alarm unit, when the normally-closed contact disconnects, alarm unit output alarm signal.
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| CN201711108874.9A CN107785870B (en) | 2017-11-11 | 2017-11-11 | Current transformer and secondary side open circuit protection device thereof |
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| CN201711108874.9A CN107785870B (en) | 2017-11-11 | 2017-11-11 | Current transformer and secondary side open circuit protection device thereof |
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| CN107785870A true CN107785870A (en) | 2018-03-09 |
| CN107785870B CN107785870B (en) | 2023-11-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112908651A (en) * | 2021-01-22 | 2021-06-04 | 成都祥和云端节能设备集团有限公司 | Safe energy-saving transformer system |
| CN113093062A (en) * | 2021-04-29 | 2021-07-09 | 北京送变电有限公司 | Terminal row open circuit monitoring system |
| WO2023087428A1 (en) * | 2021-11-19 | 2023-05-25 | 广东福德电子有限公司 | New secondary wire break protection apparatus for current transformer |
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|---|---|
| CN107785870B (en) | 2023-11-24 |
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