CN207518259U - Voltage transformer secondary voltage intelligent protection device - Google Patents
Voltage transformer secondary voltage intelligent protection device Download PDFInfo
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- CN207518259U CN207518259U CN201721563338.3U CN201721563338U CN207518259U CN 207518259 U CN207518259 U CN 207518259U CN 201721563338 U CN201721563338 U CN 201721563338U CN 207518259 U CN207518259 U CN 207518259U
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Abstract
A kind of voltage transformer secondary voltage intelligent protection device,It is related to electrical equipment technical field,The present apparatus is arranged on after voltage transformer intelligent overcurrent protection and failure vanishes are carried out with the secondary voltage generated to voltage transformer after can automatic reclosing,The utility model uses tripgear,Device for discriminating failure and CPU control devices are with reference to carry out intelligent protection to circuit,Real-time current value in normal operation circuit in sampling apparatus continuous collecting circuit,And collected real-time current value is sent to CPU control devices,To control the action of tripgear by CPU control devices,When real-time current value is excessive,The control tripgear tripping of CPU control devices,To protect voltage transformer,After tripgear trips,CPU control devices acquire the voltage of device for discriminating failure to analyze which kind of failure secondary voltage output terminal generates,After waiting for failure vanishes,CPU control devices control tripgear closes a floodgate again,Restore voltage transformer secondary voltage output.
Description
Technical field
The utility model is related to electrical equipment technical field, specially a kind of voltage transformer secondary voltage intelligent protection dress
It puts.
Background technology
High voltage of electric system is converted to relatively low secondary voltage, principle by certain no-load voltage ratio by voltage transformer
With transformer's type seemingly, the secondary voltage of output is used for protective device and backup auto-activating device logic judgment, is additionally operable to electric power personnel couple
Busbar voltage is monitored, gauge table power calculation etc..
Since secondary voltage is widely used in protecting electrical power system, measurement and metering, once secondary voltage loses, Ke Nengfa
Raw following consequence：
1. circuit distance protection may malfunction, mistrip or distance protection is exited；
2. main transformer protection compound voltage lockout opens；
3. bus differential protection compound voltage lockout opens；
4. prepared auto restart at light load may malfunction in circuit；
5. telemetry median generatrix voltage, active and reactive etc. are zero, fault distinguishing is influenced；
6. gauge table can not acquire power, the electricity charge is caused to lose.
Secondary voltage loses the safe and stable operation that can seriously affect electric system, and electric power accident or the electricity charge is caused to lose.
Voltage transformer secondary voltage protection at present is to carry out overcurrent protection, scene operation using air switch or fuse
In be susceptible to auxiliary air switch and do not trip or fuse is unblown, and the phenomenon that lead to a fuse melting.In addition, two
It can not restore automatically after secondary air switch tripping or fuse blows, operation maintenance personnel is needed to be handled to site inspection, is occurred in failure
During being completed to operation maintenance personnel processing, busbar secondary voltage in state is lost, has seriously affected the safety and stability of equipment always
Operation.
Invention content
In view of this, it is necessary to which providing a kind of can carry out secondary voltage that voltage transformer generates intelligent overcurrent protection
And the voltage transformer secondary voltage intelligent protection device of faulty circuit can be restored in time.
A kind of voltage transformer secondary voltage intelligent protection device, including tripgear, sampling apparatus, fault distinguishing dress
Put, CPU control devices and supply unit, tripgear are connected between secondary voltage input terminal and secondary voltage output terminal, with
Overcurrent protection is carried out to the secondary voltage of voltage transformer output, one end and the secondary voltage input terminal of sampling apparatus electrically connect
It connects, the other end and the CPU control devices of sampling apparatus are electrically connected, and the real-time of protective device is delivered to collection voltages mutual inductor
Current value is simultaneously provided to CPU control devices, and CPU control devices are also electrically connected with tripgear, to pass through CPU control devices pair
The real-time current value is analyzed and processed, and according to the action of analysis and processing result control tripgear, and tripgear includes
Relay, device for discriminating failure are connected between relay and CPU control devices, with after relay separating brake to inclined in circuit
It puts voltage to be acquired, collected bias voltage is delivered to CPU control devices carries out analysis comparison, and control according to CPU
The analysis comparing result of device controls relay to close a floodgate again, connects when the input terminal of relay closes a floodgate with secondary voltage input terminal
It connecing, when input terminal separating brake of relay, connect with device for discriminating failure, and the output terminal of relay is connect with secondary voltage output terminal,
Secondary voltage input terminal to be connected with secondary voltage output terminal when relay closes a floodgate, by sampling apparatus in protective device
The real-time current value of conveying is acquired, and collection result is delivered to CPU control devices and is analyzed and processed；In relay point
Device for discriminating failure is connected with secondary voltage output terminal during lock, to acquire secondary voltage output terminal by device for discriminating failure
Bias voltage, and collected bias voltage is delivered to CPU control devices and carries out analysis comparison, and controls and fills according to CPU
The analysis comparing result put controls relay to close a floodgate again；The third end of relay is connect with CPU control devices, to pass through
CPU control devices carry out the action of the switch closing and switch opening of relay intelligent control, supply unit respectively with tripgear, sampling cartridge
It puts and is electrically connected with CPU control devices, tripgear, sampling apparatus and CPU control devices to be given to power.
Preferably, CPU control devices include STM32F103 microcontrollers, and default in STM32F103 microcontrollers there are two electricity
Flow reduced value and two voltage-contrast values, respectively current upper limit value I1, floor level of electric current I2, first voltage reduced value U1With
Two voltage-contrast value U2, voltage value when real-time current value and failure that STM32F103 microcontrollers convey harvester with it is pre-
If reduced value is compared analysis, and controls the action of relay according to comparative analysis result.
Preferably, sampling apparatus includes special sampling A/D chip and high-precision CT, special sampling A/D chip and high-precision CT series connection
Between secondary voltage input terminal and STM32F103 microcontrollers, to acquire the real-time current value of secondary voltage input terminal input, and
Collected real-time current value is delivered to STM32F103 microcontrollers, STM32F103 microcontrollers by real-time current value with it is preset
Current vs' value is compared analysis, and controls the action of relay according to comparative analysis result.
Preferably, the serial fuse between relay and secondary voltage input terminal, with mono- in relay and STM32F103
Piece machine breaks down and back-up protection is provided when can not correctly act, when fuse receives reaction of the super-high-current to fusing tripping
Between for 1s, STM32F103 microcontrollers receive super-high-current to the reaction time of control relay tripping less than 1s.
Preferably, the device for discriminating failure is provided with three groups, one end of three groups of device for discriminating failure respectively with relay
Connection, the other end of three groups of device for discriminating failure are connect respectively with STM32F103 microcontrollers, to acquire the biasing of the three-phase of relay
Voltage, and collected bias voltage is transmitted to STM32F103 microcontrollers and carries out analysis comparison, every group include bias voltage,
Diode, sampling resistor R1With sampling resistor R2, bias voltage, diode, sampling resistor R1With sampling resistor R2It is sequentially connected in series
Between STM32F103 microcontrollers and secondary voltage output terminal, to carry out voltage acquisition when secondary voltage output terminal breaks down,
Bias voltage is used to provide power supply to device for discriminating failure, and the input terminal of diode is connect with bias voltage, the output of diode
End and sampling resistor R1One end connection, sampling resistor R1The other end and sampling resistor R2One end connection, by bias voltage
Orientation is sent to sampling resistor R1, and then pass through sampling resistor R1Voltage is sent to sampling resistor R again2, sampling resistor R2It is another
One end is connect with STM32F103 microcontrollers, by sampling resistor R2On voltage value be sent to STM32F103 microcontrollers, and then
Fault distinguishing is carried out by STM32F103 microcontrollers, the sampling resistor R in every group of device for discriminating failure1With sampling resistor R2Electricity
Resistance value is different, and the sampling resistor R of three groups of device for discriminating failure1With sampling resistor R2Resistance value it is different.
Preferably, protective device ontology further includes delay unit, and delay unit is connect with STM32F103 microcontrollers,
STM32F103 microcontrollers are according to the real-time current value received and preset floor level of electric current I2Between comparison result it is single to delay
First forward delay interval signal, delay unit is according to the preset time to STM32F103 singlechip feedbsck information, STM32F103 monolithics
Machine is according to the real-time current value received and preset floor level of electric current I2Between the preset arrival of comparison result and delay unit
The action of control timer.
Preferably, protective device ontology further includes key board unit, and key board unit is electrically connected with STM32F103 microcontrollers,
Relay to be controlled to move to set in reduced value and the STM32F103 microcontrollers in STM32F103 microcontrollers by key board unit
The delay time value of work.
Preferably, the time interval of sampling apparatus acquisition real-time current value is 15ms~35ms.
Preferably, the protective device ontology further includes alarm device, and alarm device electrically connects with STM32F103 microcontrollers
It connects, to play suggesting effect, alarm dress when STM32F103 microcontrollers receive super-high-current and secondary voltage output terminal failure
It puts including triode, alarm relay, red alarm lamp and display, after triode is connected on STM32F103 microcontrollers, alarm
One end connecting triode of relay, the other end connection red alarm lamp of alarm relay, receives in STM32F103 microcontrollers
During to super-high-current, electric current is transmitted to alarm relay by STM32F103 microcontrollers by triode ON, then by triode,
Alarm relay drives red alarm lamp to shine again, and so as to play the role of prompting, display connects with STM32F103 microcontrollers
It connects, the fault message that STM32F103 microcontrollers are sent out is shown, to play suggesting effect.Preferably, sampling apparatus further includes
High-precision PT, high-precision PT are connected between secondary voltage input terminal and special sampling A/D chip, to acquire secondary voltage input terminal
The real-time voltage value of input, and collected real-time voltage value is delivered to STM32F103 microcontrollers by special sampling A/D chip,
Real-time voltage value is shown to outside by STM32F103 microcontrollers by the display of alarm device, to play suggesting effect.
The utility model uses above-mentioned technical proposal, and advantage is：The present apparatus is arranged on after voltage transformer
It can close a floodgate again automatically after carrying out intelligent overcurrent protection failure vanishes with the secondary voltage generated to voltage transformer, protective device
Ontology includes tripgear, sampling apparatus, device for discriminating failure, CPU control devices and supply unit, and the utility model is using jump
Brake gear, device for discriminating failure and CPU control devices with reference to come to circuit carry out intelligent protection, sampled in normal operation circuit
Real-time current value in device continuous collecting circuit, and collected real-time current value is sent to CPU control devices, to pass through
CPU control devices control the action of tripgear, and when real-time current value is excessive, CPU control devices control tripgear is jumped
Lock, to protect voltage transformer, when tripgear trip trip after, CPU control devices acquisition device for discriminating failure voltage with
Which kind of failure analysis secondary voltage output terminal generates, and after waiting for failure vanishes, CPU control devices control tripgear closes again
Lock restores voltage transformer secondary voltage output.
Present apparatus change is traditional to protect secondary voltage using the mode of air switch or fuse, fundamentally avoids
Secondary voltage is lost, so as to ensure the safe and stable operation of electric system.
Description of the drawings
Fig. 1 is the structure diagram of the voltage transformer secondary voltage intelligent protection device of a better embodiment.
Fig. 2 is the structure diagram of device for discriminating failure.
Fig. 3 is the structure diagram of alarm device.
Fig. 4 controls relay separating brake decision flow chart for STM32F103 microcontrollers.
Fig. 5 controls relay combined floodgate decision flow chart for STM32F103 microcontrollers.
Fig. 6 is fault distinguishing flow chart.
In figure：It is voltage transformer secondary voltage intelligent protection device 10, tripgear 21, special sampling A/D chip 221, high-precision
Spend CT222, high-precision PT223, device for discriminating failure 23, bias voltage 231, diode 232, sampling resistor R1233rd, sampling electricity
Hinder R2234th, CPU control devices 24, supply unit 25, delay unit 26, key board unit 27, alarm device 28, triode 281,
Alarm relay 282, red alarm lamp 283, display 284.
Specific embodiment
Fig. 1 is please referred to, the utility model embodiment provides a kind of voltage transformer secondary voltage intelligent protection device 10,
This protective device is connected on after voltage transformer, with the secondary voltage that is generated to voltage transformer carry out intelligent overcurrent protection and
Faulty circuit is restored in time, voltage transformer secondary voltage intelligent protection device 10, including protective device ontology, protective device sheet
Body includes tripgear 21, sampling apparatus, device for discriminating failure 23, CPU control devices 24 and supply unit 25, tripgear 21
It is connected between secondary voltage input terminal and secondary voltage output terminal, overcurrent is carried out with the secondary voltage exported to voltage transformer
Protection, one end and the secondary voltage input terminal of sampling apparatus are electrically connected, the other end and 24 electricity of CPU control devices of sampling apparatus
Property connection, the real-time current value of protective device is delivered to collection voltages mutual inductor and is provided to CPU control devices 24, CPU control
Device 24 processed is also electrically connected with tripgear 21, to be carried out at analysis to the real-time current value by CPU control devices 24
Reason, and according to the action of analysis and processing result control tripgear 21, tripgear 21 includes relay, device for discriminating failure 23
It is connected between relay and CPU control devices 24, to be acquired after relay separating brake to the bias voltage in circuit, and
Collected bias voltage is delivered to CPU control devices 24 and carries out analysis comparison, the analysis comparison according to CPU control devices 24
As a result relay is controlled to close a floodgate again, the input terminal of relay is connect when closing a floodgate with secondary voltage input terminal, relay it is defeated
Enter to hold and be connect during separating brake with device for discriminating failure 23, the output terminal of relay is connect with secondary voltage output terminal, in relay
Secondary voltage input terminal is connected with secondary voltage output terminal during combined floodgate, it is real-time to what is conveyed in protective device by sampling apparatus
Current value is acquired, and collection result is delivered to CPU control devices 24 and is analyzed and processed；In relay separating brake by event
Barrier discriminating gear 23 is connected with secondary voltage output terminal, to acquire the inclined of secondary voltage output terminal by device for discriminating failure 23
Voltage is put, and collected bias voltage is delivered to CPU control devices 24 and carries out analysis comparison, and according to CPU control devices
24 analysis comparing result controls relay to close a floodgate again；The third end of relay is connect with CPU control devices 24, to pass through
CPU control devices 24 carry out the action of the switch closing and switch opening of relay intelligent control, supply unit 25 respectively with tripgear 21,
Sampling apparatus and CPU control devices 24 are electrically connected, tripgear 21, sampling apparatus and CPU control devices 24 to be given to power.
Further, CPU control devices 24 include STM32F103 microcontrollers, and two are preset in STM32F103 microcontrollers
A current vs' value and two voltage-contrast values, respectively current upper limit value I1, floor level of electric current I2, first voltage reduced value U1
With first voltage reduced value U2, voltage value when real-time current value and failure that STM32F103 microcontrollers convey harvester
With default reduced value it is compared analysis, and the action of relay is controlled according to comparative analysis result.
Further, sampling apparatus includes special sampling A/D chip 221 and high-precision CT222, special sampling A/D chip 221 and height
Precision CT222 is connected between secondary voltage input terminal and STM32F103 microcontrollers, to acquire the input of secondary voltage input terminal
Real-time current value, and collected real-time current value is delivered to STM32F103 microcontrollers, STM32F103 microcontrollers will be real-time
Current value and preset current vs' value be compared analysis, and controls the action of relay according to comparative analysis result；Specially
With sampling A/D chip 221 for the real-time current value in Acquisition Circuit, but since excessive electricity cannot be passed through in special sampling A/D chip 221
Stream, thus before special sampling A/D chip 221 connect high-precision CT222, by the electric current on circuit it is scaled after again
Special sampling A/D chip 221 is transferred to, ensure that special 221 reliability of operation of sampling A/D chip and stability.
Due to there are problems that relay and STM32F103 microcontrollers generate failure in being run in circuit, further,
Serial fuse between relay and secondary voltage input terminal, with break down in relay and STM32F103 microcontrollers can not
Back-up protection is provided during correct action, the reaction time that fuse receives super-high-current to fusing tripping is 1s, STM32F103
The reaction time that microcontroller receives super-high-current to control relay tripping is less than 1s；STM32F103 microcontrollers received
The time of the tripping of high current control relay is less than 1s, thus by fuse be connected on relay and secondary voltage input terminal it
Between, when relay and STM32F103 normal operations, fuse will not work, and be constantly in conducting state, when relay and
When STM32F103 breaks down, fuse plays the role of protecting circuit.
Further, since relay is three-phase, three groups of device for discriminating failure 23, three groups of fault distinguishings are provided with
One end of device 23 is connect respectively with relay, the other ends of three groups of device for discriminating failure 23 respectively with STM32F103 microcontrollers
Collected bias voltage to acquire the three-phase bias voltage of relay, and is transmitted to STM32F103 microcontrollers and carried out by connection
Analysis comparison, every group includes bias voltage 231, diode 232, sampling resistor R1233 and sampling resistor R2234, bias voltage
231st, diode 232, sampling resistor R1233 and sampling resistor R2234 are sequentially connected in series in STM32F103 microcontrollers and secondary voltage
Between output terminal, to carry out voltage acquisition when secondary voltage output terminal breaks down, bias voltage 231 is used for fault distinguishing
Device 23 provides power supply, and the input terminal of diode 232 is connect with bias voltage 231, the output terminal and sampling resistor of diode 232
R1233 one end connection, sampling resistor R1233 other end and sampling resistor R2234 one end connection, by bias voltage 231
Orientation is sent to sampling resistor R1233, and then pass through sampling resistor R1Voltage is sent to sampling resistor R by 233 again2234, sampling
Resistance R2234 other end is connect with STM32F103 microcontrollers, by sampling resistor R2Voltage value on 234 is sent to
STM32F103 microcontrollers, and then fault distinguishing is carried out by STM32F103 microcontrollers, adopting in every group of device for discriminating failure 23
Sample resistance R1233 and sampling resistor R2234 resistance value is different, and the sampling resistor R of three groups of device for discriminating failure1233 and sampling
Resistance R2234 resistance value is different；When relay, which closes a floodgate, to be run, STM32F103 microcontrollers without breakdown judge, when after
When electric appliance trips, STM32F103 microcontrollers are then to the sampling resistor R of the conveying of device for discriminating failure 232234 bias voltage value into
Row comparative analysis, to determine the failure of secondary voltage output terminal.
Further, protective device ontology further includes delay unit 26, and delay unit 26 connects with STM32F103 microcontrollers
It connects, STM32F103 microcontrollers are according to the real-time current value received and preset floor level of electric current I2Between comparison result to prolonging
Shi Danyuan forward delay interval signals, delay unit 26 according to the preset time to STM32F103 singlechip feedbsck information,
STM32F103 microcontrollers are according to the real-time current value received and preset floor level of electric current I2Between comparison result and delay it is single
The action of 26 preset arrival time control relay of member.
Further, protective device ontology further includes key board unit 27, and key board unit 27 and STM32F103 microcontrollers are electrical
Connection, with by key board unit 27 come set in reduced value and the STM32F103 microcontrollers in STM32F103 microcontrollers control after
The delay time value of electric appliance action.
Further, the time interval of sampling apparatus acquisition real-time current value is 15ms~35ms.
Further, the protective device ontology further includes alarm device 28, alarm device 28 and STM32F103 microcontrollers
It is electrically connected, to play suggesting effect when STM32F103 microcontrollers receive super-high-current and secondary voltage output terminal failure,
Alarm device 28 includes triode 281, alarm relay 282, red alarm lamp 283 and display 284, and triode 281 is connected
After STM32F103 microcontrollers, one end connecting triode 281 of alarm relay 282, the other end of alarm relay 282 connects
Red alarm lamp 283 is connect, when STM32F103 microcontrollers receive super-high-current, STM32F103 microcontrollers are by triode 281
Conducting, then electric current is transmitted to by alarm relay 282 by triode 281, alarm relay 282 drives red alarm lamp again
283 shine, and so as to play the role of prompting, display 284 is connect with STM32F103 microcontrollers, by STM32F103 microcontrollers
The fault message sent out is shown, to play suggesting effect.
Further, sampling apparatus further includes high-precision PT 223, and high-precision PT 223 is connected on secondary voltage input terminal
Between special sampling A/D chip, to acquire the real-time voltage value of secondary voltage input terminal input, and by collected real-time voltage
Value is delivered to STM32F103 microcontrollers by special sampling A/D chip, and STM32F103 microcontrollers fill real-time voltage value by alerting
The display put is shown to outside, to play suggesting effect.
In this embodiment, current upper limit value I1Setting value be 5A, floor level of electric current I2Setting value for 2A, biasing
231 value of voltage be 3V, first voltage reduced value be 0V, second voltage reduced value be normal operation circuit when each group fault distinguishing
Sampling resistor R in device2Collected real-time current value is sent to STM32F103 by 234 theoretical voltage value, sampling apparatus
Microcontroller, when the real-time current value that STM32F103 microcontrollers receive is less than floor level of electric current I2When, STM32F103 microcontrollers
Control relay normal operation.
In normal operation, the theoretical voltage value of each sampling resistor is as follows：
Sampling resistor R in first group of device for discriminating failure1Resistance value be 2 Ω, sampling resistor R2Resistance value be 1 Ω；
Sampling resistor R in second group of device for discriminating failure1Resistance value be 2.2 Ω, sampling resistor R2Resistance value be 0.8 Ω；Third
Sampling resistor R in group device for discriminating failure1Resistance value be 2.4 Ω, sampling resistor R2Resistance value be 0.6 Ω；Due to every group
Sampling resistor R in device for discriminating failure1233 and sampling resistor R2234 be series relationship, therefore, in normal operation,
STM32F103 microcontrollers collect the sampling resistor R flowed through in first group of device for discriminating failure2Voltage value be 1V；Flow through
Sampling resistor R in two groups of device for discriminating failure2Voltage value be 0.8V；Flow through the sampling electricity in third group device for discriminating failure
Hinder R2Voltage value be 0.6V；When secondary voltage output terminal has phase ground connection, then STM32F103 microcontrollers are collected corresponding
The sampling resistor R of phase2Then for 0V, when secondary voltage output terminal has phase fault, then the collected phase of STM32F103 microcontrollers
It answers and alternate flows through sampling resistor R2Voltage value it is then equal.
When the real-time current value that STM32F103 microcontrollers receive is more than current upper limit value I1When, STM32F103 microcontrollers
Control relay enters separating brake and judges flow, referring also to Fig. 3, and Fig. 3 controls relay separating brake to judge for STM32F103 microcontrollers
Flow chart, when the real-time current value that STM32F103 microcontrollers receive is more than current upper limit value I1When, STM32F103 microcontrollers
The instantaneous separating brake of relay is controlled, to protect circuit, when the real-time current value that STM32F103 microcontrollers receive is more than lower current limit
Value I2Less than current upper limit value I1When, STM32F103 microcontrollers control relay delay 0.5s separating brakes, delay 0.5s be in order to
Super-high-current lower-delay delays separating brake action, if super-high-current disappears in 0.5s, relay is with regard to non-shut-brake, if 0.5s
And the real-time current value received to STM32F103 microcontrollers later is still above floor level of electric current I2When, STM32F103 monolithics
Machine controls relay separating brake.
Referring also to Fig. 4, Fig. 4 control relay separating brake decision flow chart for STM32F103 microcontrollers.Relay separating brake
Afterwards, STM32F103 microcontrollers control relay keeps separating brake 5s, and circuital current to be waited for restore normal, STM32F103 is mono- at this time
Piece machine starts to acquire device for discriminating failure up-sampling resistance R2Voltage value, to judge the failure in circuit；Join simultaneously
Fig. 5 fault distinguishing flow charts are seen, if the collected sampling resistor R of STM32F103 microcontrollers2Voltage value and carry out analysis pair
Than sampling resistor R2Voltage value be equal to first voltage reduced value U1, then it represents that secondary voltage output terminal is grounded, and STM32F103 is mono-
Piece machine further controls alarm device to show the signal language of " single-phase earthing "；If collected first group of STM32F103 microcontrollers
The sampling resistor R of middle device for discriminating failure2Voltage value UR2Equal to the sampling resistor R of second group of device for discriminating failure2' voltage
Value UR2’, then secondary voltage output terminal occur short-circuit conditions, it is " alternate that STM32F103 microcontrollers further control alarm device to show
The signal language of short circuit "；If the collected sampling resistor R of STM32F103 microcontrollers2Voltage value be equal to second voltage preset value U2,
Then circuit normal non-fault, STM32F103 microcontrollers further control relay to close a floodgate again, while alarm device is controlled to show
The signal language of " normal operation ".
When relay and STM32F103 microcontrollers break down, fuse carries out overcurrent protection to circuit.
The super-high-current in single-phase, two-phase and three-phase circuit can be disconnected in time using the present apparatus, while in super-high-current
It closes a floodgate again in time after disappearance and restores voltage transformer voltage output, ensure that the safe and stable operation of electric system.
Above disclosed is only the utility model preferred embodiment, cannot limit the utility model with this certainly
Interest field, one of ordinary skill in the art will appreciate that all or part of flow of above-described embodiment is realized, and according to this reality
The equivalent variations made with novel claim still fall within the range that utility model is covered.
Claims (10)
1. a kind of voltage transformer secondary voltage intelligent protection device, it is characterised in that：Including tripgear, sampling apparatus, event
Barrier discriminating gear, CPU control devices and supply unit, tripgear are connected on secondary voltage input terminal and secondary voltage output terminal
Between, overcurrent protection, one end and the secondary voltage input terminal of sampling apparatus are carried out with the secondary voltage exported to voltage transformer
It is electrically connected, the other end and the CPU control devices of sampling apparatus are electrically connected, and protective device is delivered to collection voltages mutual inductor
Real-time current value and be provided to CPU control devices, CPU control devices also with tripgear be electrically connected, to be controlled by CPU
Device analyzes and processes the real-time current value, and according to the action of analysis and processing result control tripgear, tripping dress
Put including relay, device for discriminating failure is connected between relay and CPU control devices, with after relay separating brake to circuit
In bias voltage be acquired, collected bias voltage is delivered to CPU control devices carries out analysis comparison, and foundation
The analysis comparing results of CPU control devices controls relay to close a floodgate again, when the input terminal of relay closes a floodgate and secondary voltage
Input terminal connects, and when input terminal separating brake of relay connect with device for discriminating failure, and the output terminal and secondary voltage of relay are defeated
Outlet connects, and secondary voltage input terminal to be connected with secondary voltage output terminal when relay closes a floodgate, passes through sampling apparatus pair
The real-time current value conveyed in protective device is acquired, and collection result is delivered to CPU control devices and is analyzed and processed；
Device for discriminating failure is connected with secondary voltage output terminal in relay separating brake, it is secondary to be acquired by device for discriminating failure
The bias voltage of voltage output end, and collected bias voltage is delivered to CPU control devices and carries out analysis comparison, and foundation
The analysis comparing results of CPU control devices controls relay to close a floodgate again；The third end of relay connects with CPU control devices
It connects, to carry out intelligent control to the switch closing and switch opening action of relay by CPU control devices, supply unit fills respectively with tripping
It puts, the electric connection of sampling apparatus and CPU control devices, tripgear, sampling apparatus and CPU control devices to be given to power.
2. a kind of voltage transformer secondary voltage intelligent protection device as described in claim 1, it is characterised in that：CPU is controlled
Device includes STM32F103 microcontrollers, and default in STM32F103 microcontrollers there are two current vs' value and two voltage-contrasts
Value, respectively current upper limit value I1, floor level of electric current I2, first voltage reduced value U1With second voltage preset value U2,
Voltage value when STM32F103 microcontrollers are by real-time current value and failure that harvester conveys is compared with default reduced value
Analysis, and control the action of relay according to comparative analysis result.
3. a kind of voltage transformer secondary voltage intelligent protection device as claimed in claim 2, it is characterised in that：Sampling apparatus
Including special sampling A/D chip and high-precision CT, special sampling A/D chip and high-precision CT be connected on secondary voltage input terminal with
Between STM32F103 microcontrollers, to acquire the real-time current value of secondary voltage input terminal input, and by collected real-time current
Value is delivered to STM32F103 microcontrollers, and real-time current value and preset current vs' value are compared by STM32F103 microcontrollers
Analysis, and control the action of relay according to comparative analysis result.
4. a kind of voltage transformer secondary voltage intelligent protection device as claimed in claim 3, it is characterised in that：In relay
The serial fuse between secondary voltage input terminal, with break down in relay and STM32F103 microcontrollers can not positive positive motion
As when back-up protection is provided, the reaction time that fuse receives super-high-current to fusing tripping is 1s, STM32F103 microcontrollers
The reaction time for receiving super-high-current to control relay tripping is less than 1s.
5. a kind of voltage transformer secondary voltage intelligent protection device as claimed in claim 4, it is characterised in that：The failure
Discriminating gear is provided with three groups, and one end of three groups of device for discriminating failure is connect respectively with relay, three groups of device for discriminating failure
The other end is connect respectively with STM32F103 microcontrollers, to acquire the three-phase bias voltage of relay, and by collected biased electrical
Pressure is transmitted to STM32F103 microcontrollers and carries out analysis comparison, and every group includes bias voltage, diode, sampling resistor R1And sampling
Resistance R2, bias voltage, diode, sampling resistor R1With sampling resistor R2It is sequentially connected in series in STM32F103 microcontrollers and secondary electricity
Between pressing output terminal, to carry out voltage acquisition when secondary voltage output terminal breaks down, bias voltage is used for fault distinguishing
Device provides power supply, and the input terminal of diode is connect with bias voltage, output terminal and the sampling resistor R of diode1One end connect
It connects, sampling resistor R1The other end and sampling resistor R2One end connection, by bias voltage orientation be sent to sampling resistor R1,
And then pass through sampling resistor R1Voltage is sent to sampling resistor R again2, sampling resistor R2The other end and STM32F103 microcontrollers
Connection, by sampling resistor R2On voltage value be sent to STM32F103 microcontrollers, and then by STM32F103 microcontrollers into
Row fault distinguishing, the sampling resistor R in every group of device for discriminating failure1With sampling resistor R2Resistance value it is different, and three groups of failures are sentenced
The sampling resistor R of other device1With sampling resistor R2Resistance value it is different.
6. a kind of voltage transformer secondary voltage intelligent protection device as claimed in claim 5, it is characterised in that：Protective device
Ontology further includes delay unit, and delay unit is connect with STM32F103 microcontrollers, and STM32F103 microcontrollers are according to the reality received
When current value and preset floor level of electric current I2Between comparison result to delay unit forward delay interval signal, delay unit according to
The preset time, STM32F103 microcontrollers were according to the real-time current value received with presetting to STM32F103 singlechip feedbsck information
Floor level of electric current I2Between comparison result and delay unit preset arrival time control relay action.
7. a kind of voltage transformer secondary voltage intelligent protection device as claimed in claim 6, it is characterised in that：Protective device
Ontology further includes key board unit, and key board unit is electrically connected with STM32F103 microcontrollers, to be set by key board unit
The delay time value of the control actuating of relay in reduced value and STM32F103 microcontrollers in STM32F103 microcontrollers.
8. a kind of voltage transformer secondary voltage intelligent protection device as claimed in claim 7, it is characterised in that：Sampling apparatus
The time interval for acquiring real-time current value is 15ms~35ms.
9. a kind of voltage transformer secondary voltage intelligent protection device as claimed in claim 8, it is characterised in that：The protection
Device body further includes alarm device, and alarm device is electrically connected with STM32F103 microcontrollers, in STM32F103 microcontrollers
Suggesting effect is played when receiving super-high-current and secondary voltage output terminal failure, alarm device includes triode, alarm relay
Device, red alarm lamp and display, after triode is connected on STM32F103 microcontrollers, one end of alarm relay connects three poles
Pipe, the other end connection red alarm lamp of alarm relay, when STM32F103 microcontrollers receive super-high-current,
Electric current is transmitted to alarm relay by STM32F103 microcontrollers by triode ON, then by triode, and alarm relay drives again
Dynamic red alarm lamp shines, and so as to play the role of prompting, display is connect with STM32F103 microcontrollers, by STM32F103
The fault message that microcontroller is sent out is shown, to play suggesting effect.
10. a kind of voltage transformer secondary voltage intelligent protection device as claimed in claim 3, it is characterised in that：Sampling cartridge
It puts and further includes high-precision PT, high-precision PT is connected between secondary voltage input terminal and special sampling A/D chip, to acquire secondary electricity
The real-time voltage value of input terminal input is pressed, and collected real-time voltage value is delivered to by special sampling A/D chip
Real-time voltage value is shown to outside by STM32F103 microcontrollers, STM32F103 microcontrollers by the display of alarm device, with
Play suggesting effect.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721563338.3U CN207518259U (en) | 2017-11-21 | 2017-11-21 | Voltage transformer secondary voltage intelligent protection device |
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| CN201721563338.3U CN207518259U (en) | 2017-11-21 | 2017-11-21 | Voltage transformer secondary voltage intelligent protection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107681633A (en) * | 2017-11-21 | 2018-02-09 | 国网宁夏电力有限公司宁东供电公司 | voltage transformer secondary voltage intelligent protection device |
| CN112003236A (en) * | 2020-08-28 | 2020-11-27 | 杭州海兴电力科技股份有限公司 | Overvoltage and overcurrent protection system for electric energy meter |
-
2017
- 2017-11-21 CN CN201721563338.3U patent/CN207518259U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107681633A (en) * | 2017-11-21 | 2018-02-09 | 国网宁夏电力有限公司宁东供电公司 | voltage transformer secondary voltage intelligent protection device |
| CN107681633B (en) * | 2017-11-21 | 2023-07-14 | 国网宁夏电力有限公司宁东供电公司 | Intelligent secondary voltage protection device for voltage transformer |
| CN112003236A (en) * | 2020-08-28 | 2020-11-27 | 杭州海兴电力科技股份有限公司 | Overvoltage and overcurrent protection system for electric energy meter |
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