CN110361684A - A kind of transformer zero-seguence differential protection self-checking system and method - Google Patents
A kind of transformer zero-seguence differential protection self-checking system and method Download PDFInfo
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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
- G01R31/72—Testing of electric windings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The present invention is a kind of transformer zero-seguence differential protection self-checking system and method, 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 present invention 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, method of the invention is easy to operate, convenient and practical.
Description
Technical field
The invention belongs to zero sequence differential protecting technology fields, and in particular to a kind of transformer zero-seguence differential protection self checking system
System and method.
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) the passing through property zero flowed through by the external earth fault time-varying depressor high-pressure side in transformer area and neutral point side current transformer
Sequence electric current verifies circuit, does not put into zero sequence differential protection when transformer puts into operation usually, and master is extracted after substation's outlet failure
Become protective 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 sequence is poor by the method for area's external ground fault verification zero sequence differential protection loop
Dynamic 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, Wu Faji
The effect of Shi Fahui zero sequence differential protection.
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.
Summary of the invention
The purpose of the present invention is provide a kind of transformer for the existing deficiency of existing transformer zero-seguence differential protection verification
Zero sequence differential protection self-checking system, present system had both improved zero sequence differential polarity verification efficiency, can in time, it is accurate,
Zero sequence differential protection loop is automatically verified, the operational reliability of zero sequence differential protection is improved, prevents the differential throwing of transformer zero sequence
Maloperation occurs after fortune, and professional's work load can be mitigated, further decreases artificial operation cost.
It is a further object of the present invention to provide a kind of transformer zero-seguence differential protection self checking method, method behaviour of the invention
Make simply, it is convenient and practical.
In order to achieve the above objectives, the present invention adopts the following technical scheme that realize:
A kind of transformer zero-seguence differential protection self-checking system of the invention includes the first current transformer module, zero sequence electricity
Current transformer module, the second current transformer module, signal conditioning module, signal processing module, power module, display and input
Module, the secondary current signal of the first current transformer module, zero sequence current mutual inductor module and the second current transformer module
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 processing module
Analog quantity samples input port, and the communication port of signal processing module is connected with the communication ends of display and input module, power supply mould
Block supplies power to signal conditioning module, signal processing module and display and input module respectively.
Transformer zero-seguence differential protection self checking method of the invention, comprises the following steps that
1) the first current transformer module acquires transformer wire trackside three-phase current, and zero sequence current mutual inductor module acquires transformer
Neutral point current, the second current transformer module acquire transformer neutral point side three-phase current；
2) signal conditioning module is by first current transformer module, zero sequence current mutual inductor module and the second current transformer
The secondary current signal of module output is converted to the analog voltage signal compatible with signal processing module；
3) signal processing module acquires the analog voltage signal of the signal conditioning module output, and voltage signal is reduced into reality
Border current signal, according to the polarity of the current signal verification transformer zero-seguence differential protection module after reduction, signal processing module 5
Judge whether transformer occurs ground fault by transformer zero-seguence differential protection logic and definite value.
Compared with prior art, the invention has the following beneficial technical effects:
1) present invention acquires transformer wire trackside three-phase current in real time, and it is self-produced to obtain line side by calculating three-phase current vector sum
Zero-sequence current acquires transformer neutral point side three-phase and zero sequence actual current at the same time, equally passes through three-phase current vector sum
Obtain the self-produced zero-sequence current of neutral point side, while no-load transformer closes circle, by calculate the self-produced zero-sequence current in line side or
The difference current of neutral point side self-produced zero-sequence current and neutral point measured current, the correct feelings of secondary loop of mutual inductor wiring
Under condition, which maintains zero curve and nearby fluctuates, and judges transformer according to the physical features of transformer zero sequence difference current
The polarity of zero sequence differential protection current transformer；Further by line side three-phase current and self-produced zero-sequence current, neutral 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 transformation
When the differential incorrect polarity of device zero sequence, warning information is issued in time, is reminded staff to take measures on customs clearance, is avoided transformer zero sequence
Malfunction event occurs after putting into operation for differential protection.The present invention improves place compared to traditional transformer zero sequence differential protection method of calibration
It is, current secondary service work usually combines primary equipment power failure to carry out, therefore the variation of zero sequence differential protection loop is usual
While main transformer outage generation, main transformer telegram in reply idle-loaded switching-on, this transformer zero-seguence differential protection self-checking system can
The correctness for verifying circuit, can ensure that and scent a hidden danger in time.
2) present invention is powerful, is not only able to the polarity of verification transformer zero-seguence differential protection, moreover it is possible to utilize the first electricity
Current transformer module and the second current transformer module, which are constituted, reflects that sensitive transformer wire trackside is vertical to alternate and ground fault
Linked differential protection differs stream with neutral point side A phase, B phase and C using line side, poor according to display and the vertical connection of input module setting
Dynamic protection definite value, real-time judge transformer occurs and ground side winding operating status, escorts shield for transformer safety stable operation
Boat.
3) present invention promotes transformer zero-seguence differential protection and verifies efficiency, when saving transformer zero-seguence differential protection investment
Between, the differential polar mode of zero sequence is verified instead of traditional artificial external area error, that is, excitation surge current, it is negative to mitigate protection staff work
Load, further decreases artificial operation cost.
4) cross check mode of the present invention promotes transformer zero-seguence differential protection verification reliability, passes through line side self-produced zero
Sequence electric current and the self-produced zero-sequence current of neutral point side are compared with neutral point actual measurement zero-sequence current respectively, further confirm that transformer
The polar correctness of zero sequence differential protection current transformer, while in the process of running, two ways outlet takes logic or mode,
Improve the flexibility and accuracy of transformer zero-seguence differential protection.
5) present invention utilizes signal processor module internal mode analog quantity sample circuit, avoids additionally putting into analog quantity sampling mould
Block reduces the cost of entire check system indirectly, while utilizing internal mode analog quantity sample circuit, so that system analog quantity samples
Stronger with data processing compatibility, data processing is more convenient, quick.
6) present invention improves transformer zero-seguence differential protection method of calibration, differential using the transformer zero sequence of self checking technology
Protection, realize in time, it is accurate, automatically verify zero sequence differential protection loop, improve the operational reliability of zero sequence differential protection.
7) the invention shows and input module integrated level it is high, can not only show, record acquired current information, can also lead to
Touch manner setting transformer zero-seguence differential protection and longitudinal differential protection definite value and outlet mode are crossed, when transformer zero sequence is differential
In the case where incorrect polarity, the warning information that concurrently makes mistake is shown in time.
8) signal processing module of the present invention uses peripheral resources STM32F103 embedded intelligence processor abundant, maximum
Degree reduces system and runs power consumption, reasonable distribution processor each input, output port, while the embedded intelligence of STM32F103
Energy processor integrated level is high, it is only necessary to which various functions can be completed in simple peripheral circuit.
9) present invention is designed using modularized hardware, is attached between each module by terminal, is easily assembled to and extends
Property is strong.
Detailed description of the invention:
Fig. 1 is the functional block diagram of present system；
Fig. 2 is the schematic diagram of signal conditioning module line side three-phase current conditioning circuit of the present invention；
Fig. 3 is the schematic diagram of signal conditioning module neutral point side three-phase current conditioning circuit of the present invention；
Fig. 4 is the schematic diagram of signal conditioning module neutral point monophase current conditioning circuit of the present invention；
Fig. 5 is the schematic diagram of signal processing module circuit of the present invention.
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:
Below with reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention rather than
It limits.
As shown in Figure 1, a kind of transformer zero-seguence differential protection self-checking system of the invention, includes the first Current Mutual Inductance
Device 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 second electric current are mutual
The secondary current signal output end of sensor module 3 is respectively connected to the input terminal of signal conditioning module 4, signal conditioning module 4
Output end be connected to the analog quantity sampling input port of signal processing module 5, the communication port of signal processing module 5 and display and
The communication ends of input module 7 are connected, power module 6 supply power to respectively signal conditioning module 4, signal processing module 5 and display and
Input module 7.
Transformer zero-seguence differential protection self-checking system of the invention, further include digital quantity signal input and output module 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, described
The both ends resistance R6 are connected in parallel to 1 secondary terminals of Current Transmit, the 1 secondary terminals non-polar end of Current Transmit with
Power ground is connected, and the 1 secondary terminals polar end of Current Transmit is successively through capacitor C2, resistance R4 and operational amplifier OP1 the 2nd
Pin is connected, and the 3rd pin of operational amplifier OP1 is connected through resistance R2 with variable resistance R1 centre tap end, described variable
The one end resistance R1 is connected with power ground, and the other end is connected with 5V power supply, the 2nd pin of operational amplifier OP1 through resistance R8 with
The 6th pin of operational amplifier OP1 is connected, and the 4th pin of operational amplifier OP1 is connected with 5V power supply, the operational amplifier
The 7th foot of OP1 is connected with -5V power supply, and the 6th pin of operational amplifier OP1 is through resistance R3 and the operational amplifier OP2 the 3rd
Pin is connected, and one end of the capacitor C1 is connected with the 3rd pin of operational amplifier OP2, and the other end is connected with power ground, institute
It states the 2nd pin of operational amplifier OP2 to be connected with the 6th pin, the 4th pin of operational amplifier OP2 is connected with 5V power supply, described
The 7th foot of operational amplifier OP2 is connected with -5V power supply, and the 6th pin of operational amplifier OP2 is defeated through resistance R5 and the signal
The 1st pin of exit port P1 is connected, and the 2nd pin of signal output port P1 is connected to described through resistance R7 after being connected with power ground
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 connected in parallel to
The 64th pin of STM32F103 microprocessor U203 and 63 pins, the 60th pin of STM32F103 microprocessor U203 is through 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 pins,
Be 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.
Transformer zero-seguence differential protection self checking method of the present invention, 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 transformation
Device neutral point current, the second current transformer module 3 acquire transformer neutral point side three-phase current；
2) signal conditioning module 4 is mutual by first current transformer module 1, zero sequence current mutual inductor module 2 and the second electric current
The secondary current signal that sensor 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 voltage signal is reduced into
Actual current signal, according to the polarity of the current signal verification transformer zero-seguence differential protection module after reduction, signal processing mould
Block 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 present invention 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 self-produced zero of signal processing module
Sequence electric current, obtains the self-produced zero-sequence current in line side, and the self-produced zero-sequence current of calculating transformer neutral point side three-phase current obtains neutrality
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 subtractive polarity original
Then the self-produced zero-sequence current in line side and neutral point actual measurement zero-sequence current should be same polarity, and neutral point surveys self-produced zero-sequence current and neutrality
Point actual measurement zero-sequence current should also be 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, threshold minimum value can
10mA(0.01In, In=1A are set)；
3) if self-produced zero sequence and neutral point measured current differential seat angle meet, and hold
The continuous time is more than 60ms, then is determined as that zero sequence differential protection loop mistake, system can issue alarm signal.3I0.cal is in formula
Transformer wire trackside or the self-produced zero-sequence current of neutral point side three-phase, 3I0.neu are the external actual measurement zero-sequence current of transformer neutral point.
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 present invention not only improves transformer zero-seguence differential protection polarity verification efficiency, prevents transformer from differential protection being led out to throw
Malfunction event, and the loop problem and alarm defect elimination occurred during energy automatic Verification main transformer operation occur after fortune, reduces maintenance
Maintenance cost.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way, it is all according to the present invention
Technical spirit any simple modification to the above embodiments, change and equivalent structural changes, still fall within skill of the present invention
In the protection scope of art scheme.
Claims (10)
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 technical grade integration touch display screen, display and input module (7) and signal processing module (5) even
It connects.
8. a kind of transformer zero-seguence differential protection self checking method, it is characterised in that comprise the following steps that
1) the first current transformer module (1) acquires transformer wire trackside three-phase current, zero sequence current mutual inductor module (2) acquisition
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 by first current transformer module (1), zero sequence current mutual inductor module (2) and second
The secondary current signal of current transformer module (3) output is converted to the analog voltage signal compatible with signal processing module (5)；
3) signal processing module (5) acquires the analog voltage signal of signal conditioning module (4) output, 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.
9. transformer zero-seguence differential protection self checking method according to claim 8, it is characterised in that the signal processing
Module (5) surveyed respectively with neutral point by the self-produced zero-sequence current in line side and the self-produced zero-sequence current of neutral point side zero-sequence current into
Row cross validation further confirms that the polar correctness of transformer zero-seguence differential protection current transformer.
10. transformer zero-seguence differential protection self checking method according to claim 8, it is characterised in that the signal processing
Module (5) is also connected with display and input module (7), and display and input module (7) are for showing the first current transformer module
(1), zero sequence current mutual inductor module (2), the second current transformer module (3) current signal and transformer zero-seguence differential protection mould
Block polarity information, when ground fault or zero sequence differential protection polarity mistake occur for transformer, timely display alarm information is reminded
Staff takes appropriate measures；The display and input module (7) are also used to set transformer zero-seguence differential protection definite value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811223569.9A CN110361684A (en) | 2018-10-19 | 2018-10-19 | A kind of transformer zero-seguence differential protection self-checking system and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811223569.9A CN110361684A (en) | 2018-10-19 | 2018-10-19 | A kind of transformer zero-seguence differential protection self-checking system and method |
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| CN110361684A true CN110361684A (en) | 2019-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111141975A (en) * | 2019-12-26 | 2020-05-12 | 中国能源建设集团华东电力试验研究院有限公司 | Self-coupling transformer zero-sequence differential protection checking device and checking method thereof |
| CN114280404A (en) * | 2021-12-24 | 2022-04-05 | 北京七星飞行电子有限公司 | Angle division testing system and testing method of Scott transformer |
-
2018
- 2018-10-19 CN CN201811223569.9A patent/CN110361684A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111141975A (en) * | 2019-12-26 | 2020-05-12 | 中国能源建设集团华东电力试验研究院有限公司 | Self-coupling transformer zero-sequence differential protection checking device and checking method thereof |
| CN114280404A (en) * | 2021-12-24 | 2022-04-05 | 北京七星飞行电子有限公司 | Angle division testing system and testing method of Scott transformer |
| CN114280404B (en) * | 2021-12-24 | 2024-02-06 | 北京七星飞行电子有限公司 | Angle testing system and angle testing method for Scott transformer |
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