CN108572329A - The current sampling device and fault judgment method of feeder line power-supply system in parallel - Google Patents
The current sampling device and fault judgment method of feeder line power-supply system in parallel Download PDFInfo
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- CN108572329A CN108572329A CN201810312880.4A CN201810312880A CN108572329A CN 108572329 A CN108572329 A CN 108572329A CN 201810312880 A CN201810312880 A CN 201810312880A CN 108572329 A CN108572329 A CN 108572329A
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- feeder line
- current
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- sampling resistor
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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
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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- Engineering & Computer Science (AREA)
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- Emergency Protection Circuit Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention proposes that a kind of current sampling device and fault judgment method of feeder line power-supply system in parallel, device are made of six current transformers；Current transformer, which corresponds, to be mounted on the six roots of sensation feeder line of aviation alternator output; it is upper in the iron core of each current transformer to use two groups of windings of enameled wire coiling; one of winding is used for the current sample of feeder line open-circuit-protection in parallel, another winding is used for the current sample of differential protection；Winding for feeder line open-circuit-protection in parallel connects the signal pickup assembly of aviation power system；Two umber of turns for differential protection are identical in same phase, and define with the Same Name of Ends of respective feeder line identical；One rising for winding terminates first sampling resistor one end, and the end of the winding is connected with the origin or beginning of another winding, is connected on jointly between concatenated first sampling resistor and the second sampling resistor, and the end of another winding is connected on the other end of the second sampling resistor.The present invention reduces the total quantity of current transformer by the design to current sampling device.
Description
Technical field
The present invention relates to airplane power source technical field, the current sampling device of specially a kind of feeder line power-supply system in parallel and
Fault judgment method, the AC power supply system current sample for double-fed line parallel transmission in large aircraft.
Background technology
1, aviation AC power supply system electric energy transmission mode
In aircraft, in small-power power system, the general transmission that need to only use unit feeder transmission mode to carry out electric energy is just
Aircraft power demand can be met, referring to a) schematic diagram on the left of Fig. 1.With being continuously increased for aircraft electricity consumption, aircraft power supply system
System output power is increasing, and in the case where system of powering is constant, output generator current inevitably enlarges, this just needs to send out
The sectional area of motor output feeder accordingly increases, and feeder line can be increasingly thicker.If still unit feeder transmission mode is used to carry out electric energy
Transmission, the making of feeder line, installation, laying, connection etc. will face many difficulties and problems, in order to solve these problems,
At present with reference to large aircraft Power Management Design in the world, there is the transmission for carrying out power-supply system electric energy in such a way that double-fed line is in parallel to think
Road, referring to b) schematic diagram on the right side of Fig. 1, but it is specific how to realize and there is also what problems in the implementation, due to foreign vendor
Technology blockage is implemented to us, can not also be learnt from open source literature at present.
2, " differential protection " current sample
There are one " differential protection " projects in aircraft power system, it is short primarily directed to aerogenerator output feeder
Protection project set by road, such as the short circuit caused by feeder line damage in insulation makes feeder line and airplane frame or covering short circuit.
" differential protection " needs to acquire the current signal in generator output feeder, is typically employed in generator output feeder
The method of upper installation current transformer carries out current sample, and the current sample of the current signal of sampling and generator is believed
It number is compared, if difference is more than specified value, determines that there are differential failures, and implement to protect.The power supply of unit feeder transmission mode
System generally uses current sample method shown in Fig. 2.It accordingly can be in the power-supply system of double-fed line parallel transmission
Using current sample method shown in Fig. 3.But applicant is designed according to method shown in Fig. 3 in reality and when use is sent out
It is existing, due to pass through two feeder lines in current mutual inductor coil, needs the internal diameter of coil bigger, lead to entire current transformer
Volume accordingly increase, large aircraft general design requirement cannot be met.
3, " feeder line open-circuit-protection in parallel " current sample
In addition, applicant also found in carrying out double-fed line parallel transmission design process, double-fed line parallel connection is passed
The power-supply system of defeated mode can cause when there is the failure of in feeder line in parallel feeder line open circuit in remaining feeder line
Easily there are feeder line high current overheat, failures even on fire etc. in current doubles, so needing the electricity in double-fed line parallel transmission
Increase " feeder line open-circuit-protection in parallel " project in the system of source, this project is in the power-supply system of traditional unit feeder transmission mode
It does not need to.
In order to reduce influence of the failure to entire power-supply system, it is provided with " feeder line open-circuit-protection in parallel " project, this is double
The exclusive protection project of feeder line parallel transmission power-supply system.
The mode of " feeder line open-circuit-protection in parallel " is：Current transformer is installed on every generator output feeder to carry out
Current sample acquires the current signal in each feeder line, compares the sampled signal of two feeder lines in same phase, if difference is more than rule
Definite value determines there is feeder line open fault in parallel, needs to implement to protect, referring to Fig. 4.
Invention content
Technical problems to be solved
Obviously, if according to above-mentioned Preliminary design, in high-power (large capacity) aircraft AC electrical power generating systems of large aircraft
In, the transmission of generator electric energy is carried out by the way of double-fed line parallel connection transmission, and to realize " differential protection " and " feeder line in parallel
Open-circuit-protection " function, then at least needing to install 9 current mutual inductor coils on generator output feeder to carry out electric current
Sampling, is shown in Fig. 5, this results in the total volume of current sampling device excessive, and weight is accordingly also excessive, it is difficult to meet large aircraft
General design requirement, the present invention are exactly to propose in order to solve this problem.
Technical solution
The Integral Thought of the present invention is to cancel " differential protection " current sampling device (" differential protection " Current Transformer),
And its function is merged into " feeder line open-circuit-protection in parallel " current sampling device, as a result, by current mutual inductor coil by 9
It is a to be reduced to 6 (eliminating maximum 3 of volume).For this purpose, the present invention proposes a kind of electric current of feeder line power-supply system in parallel
Sampling apparatus and fault judgment method.
A kind of current sampling device of the feeder line power-supply system in parallel, it is characterised in that：By six current transformer groups
At；Six current transformers, which correspond, to be mounted on the six roots of sensation feeder line of aviation alternator output, wherein aviation exchange hair
Motor is per mutually using two specifications, the identical feeder line output in parallel of length, generator single-phase output electric current is I, every feedback
Electric current in line is I/2；
It is upper in the iron core of each current transformer that two groups of windings of enameled wire coiling, two windings is used all to be evenly distributed on iron core
One week；One of winding is used for the current sample of feeder line open-circuit-protection in parallel, another winding is used for the electric current of differential protection
Sampling；
Winding for feeder line open-circuit-protection in parallel connects the signal pickup assembly of aviation power system；
Two umber of turns for differential protection are identical in same phase, and define with the Same Name of Ends of respective feeder line identical；
Two winding connection modes for differential protection are in same phase：One rising for winding terminates first sampling resistor one end, should
The end of winding is connected with the origin or beginning of another winding, is connected on jointly between concatenated first sampling resistor and the second sampling resistor,
The end of another winding is connected on the other end of the second sampling resistor；The resistance value phase of first sampling resistor and the second sampling resistor
Together；The voltage signal of first sampling resistor and the second sampling resistor connects the signal pickup assembly of aviation power system.
The fault judgment method of feeder line power-supply system in parallel is realized using above-mentioned apparatus, it is characterised in that：
The signal pickup assembly of aviation power system is acquired in each current transformer and is protected for feeder line open circuit in parallel respectively
The output signal of the winding of shield, in two current transformers in same phase for the defeated of the winding of feeder line open-circuit-protection in parallel
Go out signal to be compared, if difference is more than specified value, determine there is feeder line open fault in parallel, needs to implement to protect；
Aviation power system signal pickup assembly acquisition in in two current transformers of phase be used for differential protection
The sum of the voltage of connected two series connection sampling resistors of winding U2, and electric current I is calculated according to formula U2=RI/N2,
Wherein N2 is the umber of turn that differential protection is used in current transformer, and R is the resistance value of sampling resistor；Current value will be calculated
It is compared with the inphase current signal inside aerogenerator, if difference is more than specified value, determines that there are differential failures, and real
Apply protection.
Advantageous effect
The present invention is realized first in high-power (large capacity) aircraft AC electrical power generating systems of large aircraft, using double-fed
The mode of line parallel connection transmission carries out the transmission of generator electric energy, and realizes " differential protection " and " feeder line open-circuit-protection in parallel " work(
Energy；Secondly what is more important reduces the total quantity of current transformer, weight by the design to current sampling device
It is corresponding to reduce, meet large aircraft general design requirement.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obviously, or practice through the invention is recognized.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination following accompanying drawings to embodiment
Obviously and it is readily appreciated that, wherein：
Fig. 1：Aviation AC power supply system electric energy transmission mode；(a) unit feeder transmission mode, (b) double-fed line parallel connection are transmitted
Mode.
Fig. 2：" differential protection " current sample schematic diagram under unit feeder transmission mode；
Fig. 3：" differential protection " current sample schematic diagram under double-fed line parallel transmission；
Fig. 4：The current sample mode of " feeder line open-circuit-protection in parallel "；
Fig. 5：Current sample coil mounting means schematic diagram；
Fig. 6：N2 winding connection diagrams on the feeder line in parallel of same phase two；
Fig. 7：Comparison scheme annexation figure；
Fig. 8：Annexation figure of the present invention.
Specific implementation mode
The embodiment of the present invention is described below in detail, the embodiment is exemplary, it is intended to for explaining the present invention, and
It is not considered as limiting the invention.
As shown in fig. 6, the current sampling device of the feeder line power-supply system in parallel in the present embodiment is by six current transformers
Composition；Six current transformers, which correspond, to be mounted on the six roots of sensation feeder line of aviation alternator output, and wherein aviation exchanges
Generator is per mutually using the identical feeder line output in parallel of two specifications, length, and generator single-phase output electric current is I, every
Electric current in feeder line is I/2.
It is upper in the iron core of each current transformer that two groups of windings of enameled wire coiling, two windings is used all to be evenly distributed on iron core
One week, to reduce leakage inductance；One of winding is used for the current sample of feeder line open-circuit-protection in parallel, the number of turns N1, another around
Current sample of the group for differential protection, the number of turns N2.
The number of turns is that the winding for feeder line open-circuit-protection in parallel of N1 connects the signal pickup assembly of aviation power system, is passed through
The current sampling signal of two feeder lines in parallel of same phase is compared, judges whether feeder line open fault in parallel.
Two umber of turns for differential protection are identical in same phase, are all N2, and ensure when mounted in same phase
The Same Name of Ends of two windings for being used for differential protection and respective feeder line defines identical.In same phase two for differential protection around
Organizing the mode of connection is：The termination first that rises of one winding samples R21 resistance one end, the origin or beginning of the end of the winding and another winding
It is connected, is connected on jointly between concatenated first sampling resistor R21 and the second sampling resistor R22, the end of another winding is connected on the
The other end of two sampling resistor R22；First sampling resistor is identical as the resistance value of the second sampling resistor；First sampling resistor with
The voltage signal of second sampling resistor connects the signal pickup assembly of aviation power system；By acquire the first sampling resistor R21 with
The both end voltage of second sampling resistor R22 and, be calculated corresponding electric current, and will calculating current with inside aerogenerator
Inphase current signal is compared, and judges whether differential failure.
As shown in fig. 6, if the electric current in N2 windings is relatively large (hundreds of milliamperes or bigger), sampling resistor can be pacified
Near coil, a lead-out wire (conducting wire being connected with " end 2 " in Fig. 6) can be reduced in this way；If the electricity in N2 windings
Relatively small (tens milliamperes or smaller) is flowed, sampling resistor should be just placed in engine controller.
Carry out the fault judgment method of feeder line power-supply system in parallel using above-mentioned apparatus, it is main realize " differential protection " and
" feeder line open-circuit-protection in parallel "：
The signal pickup assembly of aviation power system is acquired in each current transformer and is protected for feeder line open circuit in parallel respectively
The output signal of the winding of shield, in two current transformers in same phase for the defeated of the winding of feeder line open-circuit-protection in parallel
Go out signal to be compared, if difference is more than specified value, determine there is feeder line open fault in parallel, needs to implement to protect.
Aviation power system signal pickup assembly acquisition in in two current transformers of phase be used for differential protection
The sum of the voltage of connected two series connection sampling resistors of winding U2, and electric current I is calculated according to formula U2=RI/N2,
Wherein N2 is the umber of turn that differential protection is used in current transformer, and R is the resistance value of sampling resistor；Current value will be calculated
It is compared with the inphase current signal inside aerogenerator, if difference is more than specified value, determines that there are differential failures, and real
Apply protection.
Prove that the present invention can realize difference with reference to scheme and this embodiment scheme shown in Fig. 8 is compared shown in Fig. 7
Dynamic protection：
Definition and explanation：
1) two feeder lines " feeder line 1 " in parallel are identical with " feeder line 2 " specification, length；
2) I=generators single-phase output electric current (electric current=I/2 in every feeder line)；
3) N2, N21, N22 are the umber of turn for differential protection, and N2=N21=N22；
4) R, R21, R22 are sampling resistor, and R=R21=R22；
5) U2 is the voltage at sampling resistor both ends.
Calculating process：
For comparing scheme：
Because of I2=I/N2
So U2=R × I2=RI/N2
And to the scheme in the present embodiment：
Because of I21=I/2N21, I22=I/2N22
So U21=R21 × I21=R21I/2N21
U22=R22 × I22=R22I/2N22
Again because of R21=R22=R, N21=N22=N2
Then U21=R21I/2N21=RI/2N2
U22=R22I/2N22=RI/2N2
And U2=U21+U22=RI/2N2+RI/2N2
U2=RI/N2 can be obtained
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art are not departing from the principle of the present invention and objective
In the case of can make changes, modifications, alterations, and variations to the above described embodiments within the scope of the invention.
Claims (2)
1. a kind of current sampling device of parallel connection feeder line power-supply system, it is characterised in that：It is made of six current transformers；Six
Current transformer, which corresponds, to be mounted on the six roots of sensation feeder line of aviation alternator output, and wherein aviation alternator is per phase
Using two specifications, the identical feeder line output in parallel of length, generator single-phase output electric current is I, the electricity in every feeder line
Stream is I/2；
It is upper in the iron core of each current transformer that two groups of windings of enameled wire coiling, two windings is used all to be evenly distributed on iron core one
Week；One of winding is used for the current sample of feeder line open-circuit-protection in parallel, and electric current of another winding for differential protection is adopted
Sample；
Winding for feeder line open-circuit-protection in parallel connects the signal pickup assembly of aviation power system；
Two umber of turns for differential protection are identical in same phase, and define with the Same Name of Ends of respective feeder line identical；It is same
Two winding connection modes for differential protection are in phase：One rising for winding terminates first sampling resistor one end, the winding
End be connected with the origin or beginning of another winding, be connected on jointly between concatenated first sampling resistor and the second sampling resistor, it is another
The end of winding is connected on the other end of the second sampling resistor；First sampling resistor is identical as the resistance value of the second sampling resistor；
The voltage signal of first sampling resistor and the second sampling resistor connects the signal pickup assembly of aviation power system.
2. realizing the fault judgment method of feeder line power-supply system in parallel using claim 1 described device, it is characterised in that：
The signal pickup assembly of aviation power system is acquired in each current transformer respectively for feeder line open-circuit-protection in parallel
The output signal of winding believes the output for the winding of feeder line open-circuit-protection in parallel in two current transformers in same phase
It number is compared, if difference is more than specified value, determines there is feeder line open fault in parallel, need to implement to protect；
Aviation power system signal pickup assembly acquisition in in two current transformers of phase be used for differential protection around
The sum of the connected voltage of two series connection sampling resistors of group U2, and electric current I is calculated according to formula U2=RI/N2, wherein
N2 is the umber of turn that differential protection is used in current transformer, and R is the resistance value of sampling resistor；Current value and boat will be calculated
The inphase current signal of empty generator is compared, if difference is more than specified value, determines that there are differential failures, and implement to protect
Shield.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810312880.4A CN108572329B (en) | 2018-04-09 | 2018-04-09 | Current sampling device and fault judgment method of parallel feeder power supply system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810312880.4A CN108572329B (en) | 2018-04-09 | 2018-04-09 | Current sampling device and fault judgment method of parallel feeder power supply system |
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| CN108572329A true CN108572329A (en) | 2018-09-25 |
| CN108572329B CN108572329B (en) | 2020-03-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3648131A1 (en) * | 2018-11-02 | 2020-05-06 | Hamilton Sundstrand Corporation | Dual feeder systems having current transformers |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060044710A1 (en) * | 2004-08-24 | 2006-03-02 | Beneditz Bruce D | Ground fault detector for generator feeder |
| CN101796421A (en) * | 2007-07-19 | 2010-08-04 | 空中客车运营简易股份公司 | Improved current sensor |
| CN104049127A (en) * | 2013-03-15 | 2014-09-17 | 霍尼韦尔国际公司 | Parallel harness current imbalance and failure detection |
-
2018
- 2018-04-09 CN CN201810312880.4A patent/CN108572329B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060044710A1 (en) * | 2004-08-24 | 2006-03-02 | Beneditz Bruce D | Ground fault detector for generator feeder |
| CN101796421A (en) * | 2007-07-19 | 2010-08-04 | 空中客车运营简易股份公司 | Improved current sensor |
| CN104049127A (en) * | 2013-03-15 | 2014-09-17 | 霍尼韦尔国际公司 | Parallel harness current imbalance and failure detection |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3648131A1 (en) * | 2018-11-02 | 2020-05-06 | Hamilton Sundstrand Corporation | Dual feeder systems having current transformers |
| US11268989B2 (en) | 2018-11-02 | 2022-03-08 | Hamilton Sundstrand Corporation | Dual feeder systems having current transformers |
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| CN108572329B (en) | 2020-03-24 |
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