CN208257398U - A kind of power grid differential protection - Google Patents
A kind of power grid differential protection Download PDFInfo
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- CN208257398U CN208257398U CN201820877663.5U CN201820877663U CN208257398U CN 208257398 U CN208257398 U CN 208257398U CN 201820877663 U CN201820877663 U CN 201820877663U CN 208257398 U CN208257398 U CN 208257398U
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- optical transceiver
- master controller
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Abstract
The utility model discloses a kind of power grid differential protections.The device includes: master controller and optical transceiver, the signal emission port and pulse sending port of master controller are connected commonly through with door with the transmitting terminal of optical transceiver, it is connected after the receiver port and interruptive port of master controller are in parallel with the receiving end of optical transceiver, the signal acquisition port of master controller is connected with current sampler, power grid differential protection is respectively arranged in the both ends of the transmission line of electricity, the receiving end of head end differential protection optical transceiver is connected with the transmitting terminal of end differential protection optical transceiver, the transmitting terminal of head end differential protection optical transceiver is connected with the receiving end of end differential protection optical transceiver.Power grid differential protection provided by the utility model has the characteristics that low cost, implementation are easy and breakdown judge accuracy is high.
Description
Technical field
The utility model relates to electric network protection fields, more particularly to a kind of power grid differential protection.
Background technique
With the continuous development of national power distribution network and the continuous promotion of distribution automation degree, to the reliability requirement of power supply
Also higher and higher.The reliability of power supply is to measure an important indicator of power supply and distribution quality, measures the index of power supply and distribution reliability,
The percentage of annual time is accounted for average of the whole year power-on time generally to indicate, for example, the annual time is 8760 hours, Yong Huquan
Annual power off time 87.6 hours, i.e. power off time accounts for annual 1%, then power supply reliability is 99%.
The various intelligent monitorings of distribution automation, protective device are to improve the important leverage of power supply reliability, are especially matched
Fault Isolation and power supply self-recovering function in power grid, and optical fiber differential protective technology and its device are pressed in electric system 10KV
In system distribution, distribution network failure is quickly isolated, with the advantage that other intelligent apparatus are incomparable, and the country is first
Qualified to exploit is walked, has started planning implementation in the partial region of south electric network at present.
The implementation of optical fiber differential protective: line differential protection is often referred to the pilot protection of power transmission line, exactly uses optical fiber
The protective device at power transmission line both ends is longitudinally tied by communication channel, by the electrical quantity (electric current, direction of power etc.) at each end
It is transmitted to opposite end, the electrical quantity at both ends is compared, to judge failure in this line range or outside line range, thus certainly
It is fixed whether to cut off protected circuit.But in the prior art, optical fiber connection needs intelligent network transmission device, as optical electrical conversion is set
Standby, cost is high；Secondly, realization mechanism is complicated, it is high to the reliability requirement of web-transporting device.In addition, synchronizing for data is adopted
Sample need to eliminate the communication delay of network communication, affect the accuracy of breakdown judge.
Utility model content
The purpose of the utility model is to provide a kind of power grid differential protection, have low cost, implementation easy and
The high feature of breakdown judge accuracy.
To achieve the above object, the utility model provides following scheme:
A kind of power grid differential protection, described device include: master controller and optical transceiver, and the master controller includes
Signal acquisition port, receiver port, signal emission port, pulse sending port and interruptive port, the optical transceiver packet
Include transmitting terminal and receiving end, the signal emission port of the master controller and pulse sending port commonly through with door and the light
The transmitting terminal of transceiver is connected, after the receiver port and interruptive port of the master controller are in parallel with the optical transceiver
Receiving end be connected, the signal acquisition port of the master controller is connected with current sampler, the power grid differential protection
Device is respectively arranged in the both ends of the transmission line of electricity, is denoted as head end differential protection and end differential protection respectively,
The transmitting terminal phase of the receiving end of the head end differential protection optical transceiver and the end differential protection optical transceiver
Connection, the reception of the transmitting terminal of the head end differential protection optical transceiver and the end differential protection optical transceiver
End is connected.
Optionally, the receiving end of the head end differential protection optical transceiver passes through optical fiber and the end differential protection
The transmitting terminal of device optical transceiver is connected, the transmitting terminal of the head end differential protection optical transceiver by optical fiber with it is described
The receiving end of end differential protection optical transceiver is connected.
Optionally, the differential protection further includes analog-digital converter, the analog-digital converter respectively with the electric current
Sampler is connected with the signal acquisition port of the master controller.
Optionally, the differential protection further includes clock chip, the letter of the clock chip and the master controller
Number acquisition port be connected, the clock chip provides clock signal for the master controller.
Optionally, the clock chip is temperature compensation type clock chip.
Optionally, the differential protection further includes ferroelectric memory, the ferroelectric memory and the master controller
Signal acquisition port be connected.
Optionally, the signal acquisition port of the master controller is SPI interface.
Optionally, the interruptive port of the end differential protection is for receiving the head end differential protection
Synchronic command when, open PCA is interrupted, and after receiving the lock-out pulse that the head end differential protection is sent, in generation
It is disconnected.
Optionally, the pulse sending port of the head end differential protection is used to send out to the end differential protection
Penetrate lock-out pulse.
Optionally, the master controller is for calculating the current signal and receiver port that information collection port processing arrives
The spill current between current signal received, and judge whether transmission line of electricity breaks down according to the spill current.
According to specific embodiment provided by the utility model, the utility model discloses following technical effects: this is practical new
The power grid differential protection that type provides includes master controller and optical transceiver, the signal emission port and arteries and veins of the master controller
It rushes sending port to be connected commonly through with door with the transmitting terminal of optical transceiver, the receiver port of master controller and the middle broken ends of fractured bone
It is connected after mouth is in parallel with the receiving end of optical transceiver, the signal acquisition port of master controller is connected with current sampler, institute
The both ends that power grid differential protection is respectively arranged in the transmission line of electricity are stated, the pulse sending port of master controller is sent out to opposite end
Lock-out pulse is penetrated, opposite end is after receiving synchronization pulse, and interrupt signal transmitting carries out the synchronization of sampling instant, to eliminate
Breakdown judge due to caused by the power grid differential protection sampling instant at both ends is asynchronous is made mistakes, and breakdown judge is improved
Accuracy, realization mechanism is simple, in addition, the power grid differential protection at the utility model both ends can be connected directly by optical fiber,
Without increasing any optical electrical transceiver, reduce costs.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments for those of ordinary skill in the art without any creative labor, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is the structural schematic diagram of the utility model embodiment power grid differential protection；
Fig. 2 is the information transmission signal of the utility model embodiment head end differential protection and end differential protection
Figure；
Fig. 3 is that the utility model embodiment Interruption samples schematic diagram；
Fig. 4 is the utility model embodiment sampling instant drift schematic diagram；
Fig. 5 is that schematic diagram is corrected in the utility model embodiment sampling instant.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
The purpose of the utility model is to provide a kind of power grid differential protection, have low cost, implementation easy and
The high feature of breakdown judge accuracy.
To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, with reference to the accompanying drawing and have
Body embodiment is described in further detail the utility model.
Fig. 1 is the structural schematic diagram of the utility model embodiment power grid differential protection, as shown in Figure 1, this is practical new
The power grid differential protection that type provides includes master controller 1 and optical transceiver 3, and master controller 1 includes signal acquisition port
101, receiver port 103, signal emission port 104, pulse sending port 105 and interruptive port 102, the optical transceiver
3 include transmitting terminal 302 and receiving end 301, and the signal emission port 104 and pulse sending port 105 of the master controller 1 are common
By being connected with door 2 with the transmitting terminal 302 of the optical transceiver 3, the receiver port 103 of the master controller 1 is in
It is connected after 102 parallel connection of interruptive port with the receiving end 301 of the optical transceiver 3, the signal acquisition port of the master controller 1
101 are connected with current sampler.
The differential protection further includes analog-digital converter 4, the analog-digital converter 4 respectively with the current sampler
It is connected with the signal acquisition port 101 of the master controller 1.
The differential protection further includes clock chip 6, and the signal of the clock chip 6 and the master controller 1 is adopted
Collection port 101 is connected, and the clock chip 6 is that the master controller 1 provides clock signal.
The clock chip 6 is temperature compensation type clock chip.
Optionally, the differential protection further includes ferroelectric memory 5, the ferroelectric memory 5 and the main control
The signal acquisition port 101 of device 1 is connected.
The signal acquisition port 101 of the master controller 1 is SPI interface.
Fig. 2 is the setting figure of power grid differential protection on the utility model embodiment transmission line of electricity, as shown in Fig. 2,
The power grid differential protection is respectively arranged in the both ends of the transmission line of electricity, is denoted as head end differential protection respectively
Device and end differential protection, the receiving end of the head end differential protection optical transceiver and the end differential protection
The transmitting terminal of device optical transceiver is connected, and the transmitting terminal of the head end differential protection optical transceiver and the end are differential
The receiving end of protective device optical transceiver is connected.The company of the head end differential protection and the end differential protection
Mode is connect as optical fiber connection.
The interruptive port of end differential protection is used in the synchronic command for receiving the head end differential protection
When, open PCA is interrupted, and after receiving the lock-out pulse that the head end differential protection is sent, generates interruption.The head end
The pulse sending port of differential protection is used to emit lock-out pulse to the end differential protection.The master controller
For calculate information collection port processing to current signal and the current signal that receives of receiver port between difference electricity
Stream, and judge whether transmission line of electricity breaks down according to the spill current.
Three-phase current analog signal (the I that fundamental frequency is 50 hertza/Ib/Ic) mould carried out by multipath A/D converter
Number conversion, master controller obtains analog-digital conversion data by spi bus and is calculated, while master controller is received and dispatched by 1X9 light
Device receives the three-phase current data from opposite end, three-phase current data that local sample is obtained and from the three-phase current of opposite end
Data constitute split-phase type differential protection.Master controller obtains real-time clock by high precision temp apotype clock chip, and will generate
SOE event store into the ferroelectric memory of SPI interface.Master controller passes through 1X9 optical transceiver for the three-phase current of the machine
Data are sent to opposite end.The pulse sending port and emission port phase of master controller are connected to the transmitting of 1X9 optical transceiver with after
End, the receiving end of master controller is connect with the receiving end of 1X9 optical transceiver again after connecting with interruptive port pin.
Two differential protections are respectively defined as head end differential protection and end differential protection.
Head end differential protection is the synchronous promoter of data sampling；End differential protection data sampling is same
Step.Full-duplex communication, information transfer directions are as shown in Figure 2.
The transmitting terminal of 1X9 optical transceiver and receiving end are Transistor-Transistor Logic level, can directly be connected with the asynchronism transceiver of master controller
It connects.
As shown in Figure 1, the information emission port of master controller is used to send data, and when sending out data, pulse transmitting terminal
Mouth is set as high level state；The pulse sending port of master controller sends pulse, and synchronization and data for data sampling are adopted
Sample amendment, referred to hereinafter as lock-out pulse or corrected impulse.When sending lock-out pulse or corrected impulse, information emission port is in height
Level state.The transmission of pulse belongs to the permission of head end differential protection.
PCA interrupts the permission for belonging to end differential protection, and the triggering mode that PCA is interrupted is set as along triggering.End
In the state of normally receiving data, PCA interruption is shielded for the receiving end of differential protection；Receive lock-out pulse when
It waits, PCA interruption is opened.The PCA interruption of head end differential protection is constantly in masked state.
The synchronous process of data sampling is divided into following components:
Data sampling is synchronous: the initial time of the synchronous mainly synchronized data sampling of data sampling, by head end differential protection
Device is initiated, it is ensured that head end differential protection and end differential protection are sampled in synchronization starting.Synchronizing process: first
End differential protection passes through information emission port hair synchronic command first, and notice end differential protection prepares synchronized sampling
Moment；Open PCA is interrupted after end differential protection receives synchronic command, prepares to receive lock-out pulse.Then head end is differential
Protective device sends out lock-out pulse by pulse sending port, and lock-out pulse is transferred to by optical fiber in end differential protection
Interruption, the sampling of end differential protection OnNow analog quantity are generated on PCA pin.
Data sampling amendment: data sampling amendment is after data synchronously complete, in following long-time sampling process
In intert execute this operation.Purpose: though due to the master controller crystal oscillator of head end differential protection and end differential protection
Right frequency of oscillation is theoretically consistent, but during long-term operation, due to the difference of device, there will certainly be accumulated time
Error, data sampling amendment are exactly to design to eliminate this error.Makeover process: head end differential protection passes through letter first
It ceases emission port and sends out revision directive, notice end differential protection prepares amendment sampling instant；End differential protection is received
Open PCA is interrupted after to revision directive, prepares to receive corrected impulse.Then head end differential protection passes through pulse sending port
Corrected impulse is sent out, corrected impulse is transferred on the PCA pin of end differential protection by optical fiber and generates interruption, and end is poor
Dynamic protective device corrects the sampling instant of analog quantity immediately.
Data calculate: the data of the utility model, which calculate, uses window recursion Fu formula algorithm, calculates analog quantity
Real and imaginary parts.Head end differential protection and end differential protection a whole cycle before synchronization is using this moment
Sampled point carry out the calculating of Fu's formula.
Data transmission: the transmission quantity of data is three analog quantity (Ia/Ib/Ic) real and imaginary parts, while stamping sampled point volume
Number, convenient for the identity of opposite end verification data, the dislocation of data is effectively prevent to transmit.
The step-out of data sampling resynchronizes: in the process of running in view of device, due to certain factor (such as strong electromagnetic
Deng) cause the step-out of data sampling and design according to sampling step-out resynchronize.Synchronizing process is described above.
The correcting mode and process of data sampling: data sampling using etc. time intervals starting A/D conversion, to analog quantity into
Row is discrete.It is illustrated by taking 24 point sampling of cycle as an example:
Use timer interrupt mode to be sampled: one 24 points of cycle of timing is 20ms/24=833.33us, i.e.,
Every 833.33us timing enters 1 A/D conversion of interrupt start, is embodied in time shaft up-sampling moment square wave figure as shown in figure 3, figure
T in 31=t2=... t24=833.33us.It is assumed that the master controller of head end differential protection and end differential protection and
Crystal oscillator performance parameter is completely the same, then synchronized sampling initial time is passed through in both ends sampling, and the sampling instant figure at both ends may be implemented
It fits like a glove on a timeline, but the master controller and crystal oscillator performance of head end differential protection and end differential protection are joined
Number can not be made to completely the same, will appear the drift of sampling instant in actual moving process, as shown in figure 4, this drift
If do not corrected, the square wave of the sampling instant square wave figure of head end differential protection and end differential protection will go out
It is now gradually dislocation first, reversed, followed by is overlapped, moves in circles, the sampled data at both ends loses synchronization.
The utility model data sampling modification method: being standard using the data sampling instants figure of head end differential protection,
The data sampling instants of end differential protection are corrected, as shown in Figure 5.Makeover process is as follows: end differential protection
After receiving Sampling and Correcting order, open PCA is interrupted；End differential protection receives Sampling and Correcting pulse and generates in PCA
It is disconnected, the Sampling interrupt generation time of next point is modified in the interrupt service program.1 cycle amendment twice, can be effectively ensured
Data are synchronous.
Power grid differential protection provided by the utility model includes master controller and optical transceiver, the master controller
Signal emission port and pulse sending port are connected commonly through with door with the transmitting terminal of optical transceiver, the signal of master controller
It is connected after receiving port and interruptive port are in parallel with the receiving end of optical transceiver, the signal acquisition port of master controller and electric current
Sampler is connected, and the power grid differential protection is respectively arranged in the both ends of the transmission line of electricity, the pulse of master controller
Sending port emits lock-out pulse to opposite end, and opposite end is after receiving synchronization pulse, interrupt signal transmitting, when being sampled
The synchronization at quarter is judged by accident with eliminating the failure due to caused by the power grid differential protection sampling instant at both ends is asynchronous, is improved
The accuracy of breakdown judge, realization mechanism is simple, in addition, the power grid differential protection at the utility model both ends can directly lead to
Optical fiber connection is crossed, without increasing any optical electrical transceiver, is reduced costs.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Specific case used herein is expounded the principles of the present invention and embodiment, above embodiments
Explanation be merely used to help understand the method and its core concept of the utility model；Meanwhile for the general technology of this field
Personnel, based on the idea of the present invention, there will be changes in the specific implementation manner and application range.In conclusion
The content of the present specification should not be construed as a limitation of the present invention.
Claims (10)
1. a kind of power grid differential protection, which is characterized in that described device includes: master controller and optical transceiver, the master
Controller includes signal acquisition port, receiver port, signal emission port, pulse sending port and interruptive port, described
Optical transceiver includes transmitting terminal and receiving end, the signal emission port of the master controller and pulse sending port commonly through with
Door is connected with the transmitting terminal of the optical transceiver, after the parallel connection of the receiver port and interruptive port of the master controller with institute
The receiving end for stating optical transceiver is connected, and the signal acquisition port of the master controller is connected with current sampler, the electricity
Net differential protection is respectively arranged in the both ends of transmission line of electricity, is denoted as head end differential protection and end differential protection respectively
Device, the transmitting of the receiving end of the head end differential protection optical transceiver and the end differential protection optical transceiver
End is connected, the transmitting terminal of the head end differential protection optical transceiver and the end differential protection optical transceiver
Receiving end is connected.
2. power grid differential protection according to claim 1, which is characterized in that the head end differential protection light is received
The receiving end of hair device is connected by optical fiber with the transmitting terminal of the end differential protection optical transceiver, and the head end is differential
The transmitting terminal of protective device optical transceiver is connected by optical fiber with the receiving end of the end differential protection optical transceiver.
3. power grid differential protection according to claim 1, which is characterized in that the differential protection further includes mould
Number converter, the analog-digital converter are connected with the signal acquisition port of the current sampler and the master controller respectively
It connects.
4. power grid differential protection according to claim 1, which is characterized in that when the differential protection further includes
Clock chip, the clock chip are connected with the signal acquisition port of the master controller, and the clock chip is the master control
Device processed provides clock signal.
5. power grid differential protection according to claim 4, which is characterized in that the clock chip is temperature compensation type clock
Chip.
6. power grid differential protection according to claim 1, which is characterized in that the differential protection further includes iron
Electrical storage, the ferroelectric memory are connected with the signal acquisition port of the master controller.
7. power grid differential protection according to claim 1, which is characterized in that the signal acquisition terminal of the master controller
Mouth is SPI interface.
8. power grid differential protection according to claim 1, which is characterized in that in the end differential protection
Interruptive port is used for when receiving the synchronic command of the head end differential protection, and open PCA is interrupted, and is receiving the head
After the lock-out pulse for holding differential protection to send, interruption is generated.
9. power grid differential protection according to claim 1, which is characterized in that the arteries and veins of the head end differential protection
Sending port is rushed for emitting lock-out pulse to the end differential protection.
10. power grid differential protection according to claim 1, which is characterized in that the master controller is for calculating letter
The spill current between current signal that the collected current signal in breath acquisition port and receiver port receive, and according to institute
It states spill current and judges whether transmission line of electricity breaks down.
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| CN201820877663.5U CN208257398U (en) | 2018-06-07 | 2018-06-07 | A kind of power grid differential protection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108512204A (en) * | 2018-06-07 | 2018-09-07 | 广东科瑞德电气科技有限公司 | A kind of power grid differential protection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108512204A (en) * | 2018-06-07 | 2018-09-07 | 广东科瑞德电气科技有限公司 | A kind of power grid differential protection |
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