CN209496126U - A kind of transformer zero-seguence differential protection self-checking system - Google Patents
A kind of transformer zero-seguence differential protection self-checking system Download PDFInfo
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Abstract
The utility model is a kind of transformer zero-seguence differential protection self-checking system, including the first current transformer module, zero sequence current mutual inductor module, second current transformer module, signal conditioning module, signal processing module, power module, display and input module, first current transformer module, the secondary current signal output end of zero sequence current mutual inductor module and the second current transformer module is respectively connected to the input terminal of signal conditioning module, the output end of signal conditioning module is connected to the analog quantity sampling input port of signal processing module, the communication port of signal processing module is connected with the communication ends of display and input module, power module supplies power to signal conditioning module respectively, signal processing module and display and input module.The utility model improves the differential polarity verification efficiency of zero sequence, improves the operational reliability of zero sequence differential protection, maloperation occurs after preventing transformer zero sequence is differential from putting into operation, and cut operating costs, the utility model is easy to operate, convenient and practical.
Description
Technical field
The utility model belongs to zero sequence differential protecting technology field, and in particular to a kind of transformer zero-seguence differential protection self-correcting
Check system.
Background technique
A transformer ring important as UHV AC transmission technique field, by electromagnetic induction principle by convert alternating current at not
With voltage and current grade, source side energy transmission is completed to load side.When the failures such as short circuit occur for transformer and its route,
Transformer interior insulation oil is generated a large amount of burning mixtures by high temperature and arcing, and oily cavity pressure is caused to increased dramatically,
It can lead to Explosion of Transformer under serious conditions, great threat caused to personnel and equipment, give social economy's band very big negative shadow
It rings.Therefore, how to guarantee that transformer safety is stablized to be on active service, be all the research of expert in field of power system, scholar all the time
Emphasis.
Transformer zero-seguence differential protection has very high sensitivity to transformer winding ground fault, and not by excitation surge current
Influence, transformer zero-seguence differential protection is essential for source side, is effective supplement of transformer longitudinal differential.Usually
The correctness that transformer zero-seguence differential protection key factor is transformer neutral point current transformer polarity and use channel is influenced,
From the point of view of electric system many years operating experience, a lot of transformer zero-seguence differential protection malfunction events occurred.Such as certain power grid
Because transformer zero-seguence differential protection secondary loop of mutual inductor reason leads to false protection outstanding problem, from 2011, electricity
The false protections reason accountings such as reversed, the current transformer loop maintenance safety improper measures of current transformer loop polarity are up to 74%, such as
Shown in following table, wherein 3 be transformer zero-seguence differential protection the anti-ballistic cause of neutral point current transformer secondary circuit polarity connection.
Certain power plant in 2015 causes A set malfunction for tranformer protection tripping since singlephase earth fault occurs for route, through accident
Current Transformer Secondary is returned in the transformation process of transformer neutral point current transformer access fault oscillograph by analysis, the factory
Road is reversed, i.e., current transformer body terminal box 1S1 meets cable TH01-S2, and 1S2 meets cable TH01-S1, when leading to external area error
The zero sequence difference conductance of generation causes A to cover false protection, and rear modification wiring is that current transformer body terminal box 1S1 meets cable TH01-
S1,1S2 meet cable TH01-S2, which occurs without zero sequence differential protection malfunction event again.
Certain power grid 220kV and the above main transformer break down 20 ~ 30 every year, these accidents why occur, at all
Reason is that three-phase balance will not generate zero-sequence current when transformer operates normally, and zero sequence differential protection works people after putting into operation
Member is visually observed that stalling current without image of Buddha longitudinal difference protection like that, even if zero sequence differential protection neutral point current transformer circuit
Reversed or sampling channel failure, protective device will not alert, and be difficult to determine that zero sequence differential protection electric current is mutual in the case of non-accident
The polar correctness of sensor, so as to cause the accident that should not occur transformer zero-seguence differential protection put into operation and operational process in
It is likely to occur loop problem, since the verification difficulty of transformer zero-seguence differential protection is big, false protection is very risky, at present very
More power plant have exited main transformer zero sequence differential protection, are unfavorable for protecting transformer, how to verify transformer zero-seguence differential protection electric current
Mutual inductor polarity and the correctness in channel are that transformer safety puts into operation essential link.
Transformer zero-seguence differential protection polarity check method common at present is as follows:
1) it is passed through by what the external earth fault time-varying depressor high-pressure side in transformer area and neutral point side current transformer were flowed through
Property zero-sequence current verify circuit, do not put into zero sequence differential protection when transformer puts into operation usually, mentioned after substation's outlet failure
Take main transformer protection device recording, the correctly investment protection afterwards of verification zero sequence differential protection loop.
2) excitation surge current can be generated by utilizing when transformer during no-load closing, i.e., due to closing a floodgate when initial angle, transformer remanent magnetism etc.
Condition is different, excitation surge current asymmetrical three-phase and its each harmonic content difference, three-phase generation zero-sequence current, in zero-sequence current
Two, triple-frequency harmonics accounting is big, and feature of typically shoving is presented；If inside fault-free, excitation are gushed when transformer during no-load closing at this time
Stream is passing through property electric current, according to the zero sequence excitation surge current size and phase of the zero sequence excitation surge current of high voltage side of transformer and neutral point side
Position mutually verifies the polarity of zero sequence differential protection current transformer.
The following defects and deficiencies exist for related transformer zero-seguence differential protection verification in the prior art:
It 1) is effectively, disadvantage is that zero by the method for area's external ground fault verification zero sequence differential protection loop
Sequence differential protection cannot put into operation simultaneously with transformer, need to passively wait external area error, and zero sequence differential protection may exit for a long time, nothing
Method plays the effect of zero sequence differential protection in time.
2) solving main transformer zero sequence differential protection using the method for calibration of main transformer idle-loaded switching-on with main transformer while cannot put into operation
The problem of, but still the circuit check problem of zero sequence differential protection during operation is not solved, the claimed profession of this kind of method of calibration
Personnel have good theoretical basis and practical experience, can just make correct analysis, and practical operation difficulty is big.
Utility model content
The purpose of this utility model is to provide a kind of change for the existing deficiency of existing transformer zero-seguence differential protection verification
Depressor zero sequence differential protection self-checking system, Tthe utility model system had both improved the differential polarity verification efficiency of zero sequence, Neng Gouji
When, it is accurate, automatically verify zero sequence differential protection loop, improve the operational reliability of zero sequence differential protection, prevent transformer zero
Sequence is differential put into operation after maloperation occurs, and professional's work load can be mitigated, further decrease artificial operation cost.
In order to achieve the above objectives, the utility model adopts the following technical scheme to realize:
A kind of transformer zero-seguence differential protection self-checking system of the utility model includes the first current transformer mould
Block, zero sequence current mutual inductor module, the second current transformer module, signal conditioning module, signal processing module, power module,
Display and input module, the two of the first current transformer module, zero sequence current mutual inductor module and the second current transformer module
Primary current signal output end is respectively connected to the input terminal of signal conditioning module, and the output end of signal conditioning module is connected to signal
The analog quantity of processing module samples input port, the communication port and the communication ends phase of display and input module of signal processing module
Even, power module supplies power to signal conditioning module, signal processing module and display and input module respectively.
Compared with prior art, the utility model has technical effect beneficial below:
1) the utility model acquires transformer wire trackside three-phase current in real time, obtains line by calculating three-phase current vector sum
The self-produced zero-sequence current of trackside acquires transformer neutral point side three-phase and zero sequence actual current at the same time, equally passes through three-phase electricity
Flow vector and the self-produced zero-sequence current of neutral point side is obtained, while no-load transformer closes circle, passes through and calculate line side self-produced zero
The difference current of sequence electric current or neutral point side self-produced zero-sequence current and neutral point measured current, secondary loop of mutual inductor wiring
In correct situation, which maintains zero curve and nearby fluctuates, and is sentenced according to the physical features of transformer zero sequence difference current
The polarity of disconnected transformer zero-seguence differential protection current transformer；Further by line side three-phase current and self-produced zero-sequence current, in
Property point side three-phase current and self-produced zero-sequence current, neutral point actual measurement zero-sequence current is shown in system and input module is shown in time,
And in the differential incorrect polarity of transformer zero sequence, warning information is issued in time, is reminded staff to take measures on customs clearance, is avoided becoming
Malfunction event occurs after putting into operation for depressor zero sequence differential protection.The utility model is verified compared to traditional transformer zero sequence differential protection
Method improves place and is, current secondary service work usually combines primary equipment power failure to carry out, therefore zero sequence differential protection returns
The variation on road is usually while main transformer outage generation, main transformer telegram in reply idle-loaded switching-on, this transformer zero-seguence differential protection is certainly
Check system can verify the correctness in circuit, can ensure that and scent a hidden danger in time.
2) the utility model is powerful, is not only able to the polarity of verification transformer zero-seguence differential protection, moreover it is possible to utilize the
One current transformer module and the second current transformer module, which are constituted, reflects sensitive transformer lines to alternate and ground fault
Side longitudinal differential protection differs stream with neutral point side A phase, B phase and C using line side, is set according to display and input module vertical
Linked differential protection definite value, real-time judge transformer occurs and ground side winding operating status, protects for transformer safety stable operation
Drive convoy.
3) the utility model promotes transformer zero-seguence differential protection and verifies efficiency, saves transformer zero-seguence differential protection investment
Time verifies the differential polar mode of zero sequence instead of traditional artificial external area error, that is, excitation surge current, mitigates protection staff work
Burden, further decreases artificial operation cost.
4) the utility model cross check mode promotes transformer zero-seguence differential protection verification reliability, certainly by line side
It produces zero-sequence current and the self-produced zero-sequence current of neutral point side to compare with neutral point actual measurement zero-sequence current respectively, further confirms that change
The polar correctness of depressor zero sequence differential protection current transformer, while in the process of running, two ways outlet take logic or
Mode improves the flexibility and accuracy of transformer zero-seguence differential protection.
5) the utility model utilizes signal processor module internal mode analog quantity sample circuit, avoids additionally putting into analog quantity and adopt
Egf block reduces the cost of entire check system indirectly, while utilizing internal mode analog quantity sample circuit, so that system analog quantity
Sampling and data processing compatibility are stronger, and data processing is more convenient, quick.
6) the utility model improves transformer zero-seguence differential protection method of calibration, using the transformer zero sequence of self checking technology
Differential protection, realize in time, it is accurate, automatically verify zero sequence differential protection loop, improve the reliable for operation of zero sequence differential protection
Property.
7) the utility model is shown and input module integrated level is high, can not only be shown, be recorded acquired current information, also
Transformer zero-seguence differential protection and longitudinal differential protection definite value and outlet mode can be set by touch manner, when transformer zero sequence
In the case where differential incorrect polarity, the warning information that concurrently makes mistake is shown in time.
8) the utility model signal processing module uses peripheral resources STM32F103 embedded intelligence processor abundant,
It utmostly reduces system and runs power consumption, reasonable distribution processor each input, output port, while STM32F103 is embedded in
Formula intelligent processor integrated level is high, it is only necessary to which various functions can be completed in simple peripheral circuit.
9) the utility model is designed using modularized hardware, is attached between each module by terminal, be easily assembled to and
Scalability is strong.
Detailed description of the invention:
Fig. 1 is the functional block diagram of Tthe utility model system；
Fig. 2 is the schematic diagram of the utility model signal conditioning module line side three-phase current conditioning circuit；
Fig. 3 is the schematic diagram of the utility model signal conditioning module neutral point side three-phase current conditioning circuit；
Fig. 4 is the schematic diagram of the utility model signal conditioning module neutral point monophase current conditioning circuit；
Fig. 5 is the schematic diagram of the utility model signal processing module circuit.
In figure: the first current transformer module 1, zero sequence current mutual inductor module 2, the second current transformer module 3, signal
Conditioning module 4, signal processing module 5, power module 6, display and input module 7, digital quantity signal input and output module 8.
Specific embodiment:
The utility model is described in further detail below with reference to specific embodiment, described is to the utility model
Explanation rather than limit.
As shown in Figure 1, a kind of transformer zero-seguence differential protection self-checking system of the utility model, includes the first electric current
Mutual inductor module 1, zero sequence current mutual inductor module 2, the second current transformer module 3, signal conditioning module 4, signal processing mould
Block 5, power module 6, display and input module 7, the first current transformer module 1, zero sequence current mutual inductor module 2 and the second electricity
The secondary current signal output end of current transformer module 3 is respectively connected to the input terminal of signal conditioning module 4, signal conditioning module
4 output end is connected to the analog quantity sampling input port of signal processing module 5, the communication port of signal processing module 5 and aobvious
Show and the communication ends of input module 7 are connected, power module 6 supplies power to signal conditioning module 4, signal processing module 5 respectively and shows
Show and input module 7.
The transformer zero-seguence differential protection self-checking system of the utility model further includes digital quantity signal input and output mould
Block 8, digital quantity signal input and output module 8 are connected to the digital quantity input and output port of signal processing module 5.
In the present embodiment, the 6 output voltage grade of power module is ± 3.3V, ± 5V, ± 12V, ± 24V；Power supply mould
Block 6 is used to provide power supply energy for the signal conditioning module 4, signal processing module 5 and display and input module 7；The number
The action message and sending transformer zero of the input of word amount signal and output module 8 for receiving transformer electricity and non-ionizing energy loss
The alarm of sequence differential protection and trip signal.
In the present embodiment, first current transformer module 1 includes three single-phase current transformers, acquires transformation respectively
Device line side A, B, C phase current；The zero sequence current mutual inductor module 2 includes a single-phase current transformer, acquires transformer
Ground side neutral point monophase current；Second current transformer module 3 includes three single-phase current transformers, and acquisition becomes respectively
Depressor neutral point side A, B, C phase current.
In the present embodiment, first current transformer module 1 or the second current transformer module 3 and zero sequence current mutual inductance
Device module 2, which is constituted, reflects sensitive transformer zero-seguence differential protection system to transformer winding ground fault；The signal processing
Module 5 obtains the self-produced zero-sequence current of transformer wire trackside by calculating 1 three-phase current vector sum of the first current transformer module, into
The neutral point current verification transformer zero-seguence differential protection current transformer that one step is acquired using zero sequence current mutual inductor module 2
Polarity；The signal processing module 5 obtains transformer neutrality by calculating 3 three-phase current vector sum of the second current transformer module
The point self-produced zero-sequence current in side, and acquire neutral point current using zero sequence current mutual inductor module 2 and verify the differential guarantor of transformer zero sequence
Protect the polarity of current transformer；First current transformer module 1 and the second current transformer module 3 constitute transformer lines
Sensitive differential protective system is reflected to alternate and ground fault in the protection scope of side；The signal processing module 5 calculates separately
The A phase current vector sum of first current transformer module 1 and the second current transformer module 3, B phase current vector sum C phase current
Vector sum, further obtains A difference stream, B difference stream, C difference stream, and the signal processing module 5 is differed by A difference stream, B
Stream, C difference stream judge ground connection and phase-to phase fault whether occur within the scope of transformer differential protection.
As shown in Figure 2, Figure 3, Figure 4, the signal conditioning module 4 includes several identical monophase current signal condition electricity
Road, the monophase current signal conditioning circuit include signal input port P2, Current Transmit 1, operational amplifier OP1, fortune
Calculate amplifier OP2, signal output port P1, variable resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance
R7, resistance R8 and capacitor C1, capacitor C2；
The 1st pin of signal input port P2 and the 2nd pins in parallel are connected to the Current Transmit 1 once end,
The both ends the resistance R6 are connected in parallel to 1 secondary terminals of Current Transmit, 1 secondary terminals of the Current Transmit nonpolarity
End is connected with power ground, and the 1 secondary terminals polar end of Current Transmit is successively through capacitor C2, resistance R4 and operational amplifier
The 2nd pin of OP1 is connected, and the 3rd pin of operational amplifier OP1 is connected through resistance R2 with variable resistance R1 centre tap end, institute
It states the one end variable resistance R1 to be connected with power ground, the other end is connected with 5V power supply, and the 2nd pin of operational amplifier OP1 is through electricity
Resistance R8 is connected with the 6th pin of operational amplifier OP1, and the 4th pin of operational amplifier OP1 is connected with 5V power supply, the operation
The 7th foot of amplifier OP1 is connected with -5V power supply, and the 6th pin of operational amplifier OP1 is through resistance R3 and the operational amplifier
The 3rd pin of OP2 is connected, and one end of the capacitor C1 is connected with the 3rd pin of operational amplifier OP2, the other end and power ground
It is connected, the 2nd pin of operational amplifier OP2 is connected with the 6th pin, the 4th pin of operational amplifier OP2 and 5V power supply phase
Even, the 7th foot of operational amplifier OP2 is connected with -5V power supply, the 6th pin of operational amplifier OP2 through resistance R5 with it is described
The 1st pin of signal output port P1 is connected, and the 2nd pin of signal output port P1 is connect after being connected with power ground through resistance R7
To the 6th pin of operational amplifier OP2.
As shown in figure 5, the signal processing module 5 includes STM32F103 microprocessor U203, capacitor C212, capacitor
C213, capacitor C210, capacitor C208, capacitor C231, capacitor C230, capacitor C232, capacitor C207, capacitor C209, capacitor C202,
Capacitor C206, capacitor C200, capacitor C201, capacitor C203, resistance R214, resistance R215, resistance R202, crystal oscillator
Y200, crystal oscillator Y201, TPS73233 voltage stabilizing chip U210, diode D201, diode D200 and battery BT200；
The 64th pin of STM32F103 microprocessor U203 is connected with 3.3V power supply, and the both ends the capacitor C212 are in parallel
To the 64th pin of STM32F103 microprocessor U203 and 63 pins, the 60th pin of STM32F103 microprocessor U203 is through electricity
Resistance R214 is connected with power ground.The both ends the capacitor C213 are connected in parallel to the 48th pin of STM32F103 microprocessor U203 and 47 and draw
Foot is connected after the ground connection of the battery BT200 negative polarity end with the one end the capacitor C203, the capacitor C203 other end with it is described
The 1st pin of STM32F103 microprocessor U203 is connected, the battery BT200 positive ends respectively through diode D200 anode and
It is connected after cathode with the 1st pin of STM32F103 microprocessor U203, the diode D201 anode is connected with 3.3V power supply, yin
Pole is connected with the diode D200 cathode, and the both ends the crystal oscillator Y200 are connected in parallel to the STM32F103 microprocessor
U203 the 3rd and the 4th pin, the one end the crystal oscillator Y200 are connected through capacitor C200 with power ground, the crystal oscillator
The Y200 other end is connected through capacitor C201 with power ground, and both ends connect respectively after the resistance R202 is in parallel with crystal oscillator Y201
It is connected to the 5th pin of STM32F103 microprocessor U203 and the 6th pin, the one end the capacitor C202 and the one end capacitor C206
It is connected after ground connection with the 12nd pin of STM32F103 microprocessor U203, the capacitor C202 other end and crystal oscillator
The 1st pin of Y201 be connected, the capacitor C206 other end is connected with the 2nd pin of crystal oscillator Y201, the capacitor C207 with
One end is connected with power ground and the 12nd pin of STM32F103 microprocessor U203 respectively after capacitor C209 is in parallel, the other end and institute
It states the 13rd pin of STM32F103 microprocessor U203 to be connected, the both ends the capacitor C230 are connected in parallel to the TPS73233 pressure stabilizing core
The 1st pin of piece U210 and the 2nd pin, the 1st pin of TPS73233 voltage stabilizing chip U210 are connected with 3.3V, the TPS73233
The 2nd pin of voltage stabilizing chip U210 is connected with power ground, and the 3rd pin of TPS73233 voltage stabilizing chip U210 is connected with the 1st pin,
The TPS73233 voltage stabilizing chip U210 the 4th draws foot meridian capacitor C231 and is connected with power ground, the TPS73233 voltage stabilizing chip
The 5th pin of U210 is connected with the 13rd pin of STM32F103 microprocessor U203, the STM32F103 microprocessor U203
28th pin is connected through resistance R215 with power ground, and the both ends the capacitor C210 are connected in parallel to the STM32F103 microprocessor
The 31st pin of U203 and the 32nd pin；The 20th pin of STM32F103 microprocessor U203 and the signal output port P1
1st pin is connected.
The display and input module 7 use touch display screen, and display and input module 7 are connect with signal processing module 5.
In the present embodiment, display and input module 7 use technical grade integration touch display screen, and the display and input module 7 are to go here and there
Row communication mode and the signal processing module 5 carry out information sharing, record in real time and show that signal processing module 5 acquires electricity
Amplitude, phase, trend and zero sequence differential protection current transformer polarity information are flowed, transformation zero sequence is set by artificial touch input
Differential protection definite value, and the definite value is transmitted to signal processing module 5.
The utility model transformer zero-seguence differential protection self checking method, comprises the following steps that
1) the first current transformer module 1 acquires transformer wire trackside three-phase current, and zero sequence current mutual inductor module 2 acquires
Transformer neutral point electric current, the second current transformer module 3 acquire transformer neutral point side three-phase current；
2) signal conditioning module 4 is electric by first current transformer module 1, zero sequence current mutual inductor module 2 and second
The secondary current signal that current transformer module 3 exports is converted to the analog voltage signal compatible with signal processing module 5；
3) signal processing module 5 acquires the analog voltage signal that the signal conditioning module 4 exports, and also by voltage signal
Original is at actual current signal, according to the polarity of the current signal verification transformer zero-seguence differential protection module after reduction, at signal
Reason module 5 judges whether transformer occurs ground fault by transformer zero-seguence differential protection logic and definite value.
The signal processing module 5 is by the self-produced zero-sequence current in line side and the self-produced zero-sequence current of neutral point side respectively in
Property point actual measurement zero-sequence current carry out cross validation, further confirm that transformer zero-seguence differential protection current transformer is polar correct
Property.
The signal processing module 5 is connected with display and input module 7, and display and input module 7 are for showing the first electricity
Current transformer module 1, zero sequence current mutual inductor module 2,3 current signal of the second current transformer module and transformer zero sequence are differential
Protective module polarity information, when ground fault or zero sequence differential protection polarity mistake occur for transformer, timely display alarm letter
Breath reminds staff to take appropriate measures；The display and input module 7 are also used to set transformer zero-seguence differential protection
Definite value.
The utility model verifies transformer zero-seguence differential protection polarity, and the specific method is as follows:
1) transformer during no-load closing or external area error, the automatic calculating transformer line side three-phase current of signal processing module is certainly
Zero-sequence current is produced, obtains the self-produced zero-sequence current in line side, the self-produced zero-sequence current of calculating transformer neutral point side three-phase current obtains
Neutral point surveys self-produced zero-sequence current, and acquisition transformer neutral point surveys zero-sequence current, and three is passing through property electric current, according to subtracting pole
Property the self-produced zero-sequence current in principle line side and neutral point actual measurement zero-sequence current should be same polarity, neutral point survey self-produced zero-sequence current and
Neutral point, which surveys zero-sequence current, to be also same polarity, and differential seat angle is at 0 degree, if being configured to additive polarity, differential seat angle is 180 degree；
2) virtual value threshold is arranged in self-produced zero-sequence current and actual measurement zero-sequence current, is more than threshold starting verification, and threshold is minimum
It is worth settable 10mA(0.01In, In=1A)；
3) if self-produced zero sequence and neutral point measured current differential seat angle meet,
And the duration is more than 60ms, then is determined as that zero sequence differential protection loop mistake, system can issue alarm signal.In formula
3I0.cal is transformer wire trackside or the self-produced zero-sequence current of neutral point side three-phase, and 3I0.neu is the external actual measurement of transformer neutral point
Zero-sequence current.
4) zero sequence differential protection loop is judged to mistake, after modifying wiring, need to be connect again to transformer during no-load closing with verifying
Line modifies correctness.
The utility model not only improves transformer zero-seguence differential protection polarity verification efficiency, prevents transformer from leading out differential guarantor
Malfunction event, and the loop problem and alarm defect elimination occurred during energy automatic Verification main transformer operation occur after putting into operation for shield, reduce
Repair and maintenance cost.
The above is only the preferred embodiment of the utility model, not imposes any restrictions to the utility model, all
According to any simple modification to the above embodiments of the utility model technical spirit, change and equivalent structural changes, still
Belong in the protection scope of technical solutions of the utility model.
Claims (7)
1. a kind of transformer zero-seguence differential protection self-checking system, it is characterised in that include the first current transformer module (1),
Zero sequence current mutual inductor module (2), the second current transformer module (3), signal conditioning module (4), signal processing module (5),
Power module (6), display and input module (7), the first current transformer module (1), zero sequence current mutual inductor module (2) and the
The secondary current signal output end of two current transformer modules (3) is respectively connected to the input terminal of signal conditioning module (4), signal
The output end of conditioning module (4) is connected to the analog quantity sampling input port of signal processing module (5), signal processing module (5)
Communication port be connected with the communication ends of display and input module (7), power module (6) supplies power to signal conditioning module respectively
(4), signal processing module (5) and display and input module (7).
2. transformer zero-seguence differential protection self-checking system according to claim 1, it is characterised in that further include digital quantity
Signal input and output module (8), digital quantity signal input and output module (8) are connected to the number of signal processing module (5)
Measure input and output port.
3. transformer zero-seguence differential protection self-checking system according to claim 1, it is characterised in that the power module
(6) output voltage grade is ± 3.3V, ± 5V, ± 12V, ± 24V.
4. transformer zero-seguence differential protection self-checking system according to any one of claims 1 to 3, it is characterised in that described
First current transformer module (1) includes three single-phase current transformers, acquires transformer wire trackside A, B, C phase current respectively；
The zero sequence current mutual inductor module (2) includes a single-phase current transformer, acquires transformer grounding side neutral point single-phase electricity
Stream；Second current transformer module (3) include three single-phase current transformers, respectively acquire transformer neutral point side A, B,
C phase current.
5. transformer zero-seguence differential protection self-checking system according to claim 4, it is characterised in that the signal condition
Module (4) includes several identical monophase current signal conditioning circuits, and the monophase current signal conditioning circuit includes signal
Input port P2, Current Transmit 1, operational amplifier OP1, operational amplifier OP2, signal output port P1, variable resistance
R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8 and capacitor C1, capacitor C2；The signal is defeated
The 1st pin of inbound port P2 and the 2nd pins in parallel are connected to the Current Transmit 1, and once end, the both ends the resistance R6 are in parallel
1 secondary terminals of Current Transmit are connected to, the 1 secondary terminals non-polar end of Current Transmit is connected with power ground, institute
1 secondary terminals polar end of Current Transmit is stated successively to be connected through capacitor C2, resistance R4 with the 2nd pin of operational amplifier OP1, it is described
The 3rd pin of operational amplifier OP1 is connected through resistance R2 with variable resistance R1 centre tap end, the one end the variable resistance R1 and electricity
Source it is connected, the other end is connected with 5V power supply, and the 2nd pin of operational amplifier OP1 is through resistance R8 and operational amplifier OP1 the
6 pins are connected, and the 4th pin of operational amplifier OP1 is connected with 5V power supply, the 7th foot of operational amplifier OP1 and -5V electricity
Source is connected, and the 6th pin of operational amplifier OP1 is connected through resistance R3 with the 3rd pin of operational amplifier OP2, the electricity
The one end for holding C1 is connected with the 3rd pin of operational amplifier OP2, and the other end is connected with power ground, the operational amplifier OP2
2nd pin is connected with the 6th pin, and the 4th pin of operational amplifier OP2 is connected with 5V power supply, the operational amplifier OP2
7 feet are connected with -5V power supply, and the 6th pin of operational amplifier OP2 is through resistance R5 and the 1st pin of signal output port P1
It is connected, the 2nd pin of signal output port P1 through resistance R7 is connected to the operational amplifier OP2 the after being connected with power ground
6 pins.
6. transformer zero-seguence differential protection self-checking system according to claim 5, it is characterised in that the signal processing
Module (5) includes STM32F103 microprocessor U203, capacitor C212, capacitor C213, capacitor C210, capacitor C208, capacitor
C231, capacitor C230, capacitor C232, capacitor C207, capacitor C209, capacitor C202, capacitor C206, capacitor C200, capacitor C201,
Capacitor C203, resistance R214, resistance R215, resistance R202, crystal oscillator Y200, crystal oscillator Y201, TPS73233 are steady
Press chip U210, diode D201, diode D200 and battery BT200；The 64th pin of STM32F103 microprocessor U203
It is connected with 3.3V power supply, the both ends the capacitor C212 are connected in parallel to the 64th pin of STM32F103 microprocessor U203 and 63 pins, institute
It states the 60th pin of STM32F103 microprocessor U203 to be connected through resistance R214 with power ground, the both ends the capacitor C213 are connected in parallel to
The 48th pin of STM32F103 microprocessor U203 and 47 pins, after the ground connection of the battery BT200 negative polarity end with the capacitor
The one end C203 is connected, and the capacitor C203 other end is connected with the 1st pin of STM32F103 microprocessor U203, the electricity
Pond BT200 positive ends respectively after diode D200 anode and cathode with the 1st pin phase of STM32F103 microprocessor U203
Even, the diode D201 anode is connected with 3.3V power supply, and cathode is connected with the diode D200 cathode, the crystal oscillation
The both ends device Y200 are connected in parallel to the STM32F103 microprocessor U203 the 3rd and the 4th pin, the one end the crystal oscillator Y200
It is connected through capacitor C200 with power ground, the crystal oscillator Y200 other end is connected through capacitor C201 with power ground, the electricity
Resistance R202 it is in parallel with crystal oscillator Y201 after both ends be respectively connected to the 5th pin of STM32F103 microprocessor U203 and
6th pin, the one end the capacitor C202 are drawn after being grounded with the one end capacitor C206 with the STM32F103 microprocessor U203 the 12nd
Foot is connected, and the capacitor C202 other end is connected with the 1st pin of crystal oscillator Y201, the capacitor C206 other end and crystal
The 2nd pin of oscillator Y201 is connected, the capacitor C207 and capacitor C209 it is in parallel after one end respectively with power ground and STM32F103
The 12nd pin of microprocessor U203 is connected, and the other end is connected with the 13rd pin of STM32F103 microprocessor U203, the electricity
Hold the both ends C230 and is connected in parallel to the 1st pin of TPS73233 voltage stabilizing chip U210 and the 2nd pin, the TPS73233 voltage stabilizing chip
The 1st pin of U210 is connected with 3.3V, and the 2nd pin of TPS73233 voltage stabilizing chip U210 is connected with power ground, described
The 3rd pin of TPS73233 voltage stabilizing chip U210 is connected with the 1st pin, and the 4th pin of TPS73233 voltage stabilizing chip U210 is through electricity
Hold C231 to be connected with power ground, the 5th pin of TPS73233 voltage stabilizing chip U210 and the STM32F103 microprocessor U203
13rd pin is connected, and the 28th pin of STM32F103 microprocessor U203 is connected through resistance R215 with power ground, the capacitor
The both ends C210 are connected in parallel to the 31st pin of STM32F103 microprocessor U203 and the 32nd pin；The STM32F103 micro process
The 20th pin of device U203 is connected with the 1st pin of signal output port P1.
7. a kind of transformer zero-seguence differential protection self-checking system according to claim 6, it is characterised in that the display
And input module (7) uses touch display screen, display and input module (7) are connect with signal processing module (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821702002.5U CN209496126U (en) | 2018-10-19 | 2018-10-19 | A kind of transformer zero-seguence differential protection self-checking system |
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| CN201821702002.5U CN209496126U (en) | 2018-10-19 | 2018-10-19 | A kind of transformer zero-seguence differential protection self-checking system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111580020A (en) * | 2020-05-27 | 2020-08-25 | 中国南方电网有限责任公司 | Three-phase split type transformer CT polarity verification method and system |
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2018
- 2018-10-19 CN CN201821702002.5U patent/CN209496126U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111580020A (en) * | 2020-05-27 | 2020-08-25 | 中国南方电网有限责任公司 | Three-phase split type transformer CT polarity verification method and system |
| CN111580020B (en) * | 2020-05-27 | 2022-03-11 | 中国南方电网有限责任公司 | Three-phase split type transformer CT polarity verification method and system |
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