CN106711963B - Multistage route differential protective system and method - Google Patents
Multistage route differential protective system and method Download PDFInfo
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- CN106711963B CN106711963B CN201611023993.XA CN201611023993A CN106711963B CN 106711963 B CN106711963 B CN 106711963B CN 201611023993 A CN201611023993 A CN 201611023993A CN 106711963 B CN106711963 B CN 106711963B
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- protected host
- line terminal
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- electrical quantity
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2209/00—Arrangements in telecontrol or telemetry systems
- H04Q2209/70—Arrangements in the main station, i.e. central controller
- H04Q2209/75—Arrangements in the main station, i.e. central controller by polling or interrogating the sub-stations
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- Emergency Protection Circuit Devices (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a kind of multistage route differential protective system and method, the multistage route includes：It is Bulk Supply Substation, several from substation, and it is connected to the Bulk Supply Substation and the transmission line of electricity between substation, the system comprises：Protected host, protection slave, optical line terminal, optical network unit and optical fiber；Protected host and optical line terminal are set in the Bulk Supply Substation；Slave and optical network unit is protected to be set to described out of substation；Protected host is connect by optical line terminal with optical fiber；Protection slave is connect by optical network unit with optical fiber；The optical fiber is made of a fibre core.The present invention utilizes the time delay and network scalability of the fast and stable of the point-to-point communication of Ethernet passive optical network; it is protected for route differential current; especially T wiring even multiple spot T link; only with a fibre core can realization device distal end configuration and information call, save a large amount of fiber resource.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, in particular to a kind of multistage route differential protective system and
Method.
Background technique
Route differential current is protected due to its intrinsic phase selection ability, load-bearing capacity of hiding, resistant and oscillation resistant ability, either
Reliability, sensitivity, rapidity and selectivity are all more excellent compared with circuit longitudinal distance protection and Unit protection performance, and
And its criterion is unrelated with voltage, is therefore widely used in high-tension line, south electric network 220kV and Above Transmission Lines are even all adopted
Use the protection of route differential current as two sets of main protections.
Route differential current protection at present generallys use multiplex channel or special optic fibre as communication channel.Using multiple
When with channel, protective device is equipped with one and receives two optical ports of hair, and is installed on a hair one of the photoelectric conversion device of communications equipment room
Receive the connection of two optical ports, convert optical signals into electric signal, by SDH (Synchronous Digital Hierarchy, together
Walk digital hierarchy) network opposite side photoelectric conversion device and opposite side protective device communication.When using special optic fibre mode, protective device
Two optical ports are received equipped with a hair one, pass through route OPGW (Optical Fiber Composite Overhead Ground
Wire, optical fiber composite overhead ground wire) two fiber cores and opposite side protective device one receive a hair two optical ports communication.
Above-mentioned communication mode, especially special optic fibre mode, a communication channel need to occupy two fibre cores, actual transmissions
Bandwidth is two-way also with regard to 4M bandwidth, causes the significant wastage of the communication resource.On the other hand, it if transmission line of electricity is T link, uses
The T wiring differential protection of conventional communication mode, each device needs and another two devices carry out point-to-point communication, even if two slaves
Between be not in communication with each other, also at least need four fibre cores, for π wiring or multiple spot T link, need more fibre core resources.
Summary of the invention
Goal of the invention of the invention is to provide a kind of multistage route differential protective system and method, and solving multistage route needs
The problem of wanting more fibre core resources.
According to embodiments of the present invention in a first aspect, providing a kind of multistage route differential protective system, the multistage route
Including：Bulk Supply Substation equipped with main bus-bar and main circuit breaker, equipped with from bus and from the several from substation, Yi Jilian of breaker
It is connected to the Bulk Supply Substation and the transmission line of electricity between substation, the system comprises：Protected host, protection slave,
Optical line terminal, optical network unit and optical fiber；
The protected host and the optical line terminal are set in the Bulk Supply Substation；
The protection slave and the optical network unit are set to described out of substation；
The protected host is connect by the optical line terminal with the optical fiber；
The protection slave is connect by the optical network unit with the optical fiber；
The optical fiber is made of a fibre core.
The protected host is used to acquire the first electrical quantity according to the main bus-bar；Receive the second electrical quantity；According to described
Difference current is calculated in first electrical quantity and second electrical quantity；Judge that the multistage route is according to the difference current
It is no to break down；If the multistage line failure, the protected host issues the main circuit breaker and described from disconnected
The trip signal of road device；
The protection slave be used for according to described in from bus synchronous acquisition described in the second electrical quantity.
Further, in the multistage route differential protective system, the optical line terminal and the optical network unit
Only transmission commercial data.
Further, in the multistage route differential protective system, the optical line terminal and the optical network unit
It is made of special chip or field programmable gate array.
Second aspect according to embodiments of the present invention provides a kind of multistage line differential protection method, is used for above-mentioned multistage
Line differential protection system, the described method comprises the following steps：
The protected host acquires the first electrical quantity according to main bus-bar；
The protected host receives the second electrical quantity, second electrical quantity be the protection slave according to from bus
Synchronous acquisition；
Difference current is calculated according to first electrical quantity and second electrical quantity in the protected host；
The protected host judges whether the multistage route breaks down according to the difference current；
If the multistage line failure, the protected host issues the main circuit breaker and described from breaker
Trip signal.
Further, in the multistage line differential protection method, the protected host receives the second electrical quantity, specifically
For：Electric quantity information is exchanged by proprietary protocol between the optical line terminal and the optical network unit, or passes through IEC
61850 agreements exchange SMV, GOOSE message and MMS message.
Further, in the multistage line differential protection method, the optical line terminal and the optical network unit it
Between SMV, GOOSE message and MMS message exchanged by 61850 agreement of IEC, specially：The SMV, the GOOSE message and
The MMS message bandwidth allocation is using the method for fixing polling cycle and Dynamic Bandwidth Allocation.
Further, in the multistage line differential protection method, the SMV, GOOSE message and MMS message bandwidth point
With the method using fixed polling cycle and Dynamic Bandwidth Allocation, specially：
A kind of new REPORT is arranged to upload and/or GATE issuing mechanism, upstream bandwidth is divided into the SMV, described
Three priority, the SMV highest priority are arranged in GOOSE message, the MMS message three classes, and the GOOSE message is taken second place,
The MMS message is minimum.
Further, in the multistage line differential protection method, second electrical quantity be the protection slave according to
It is described from bus synchronous acquisition, specially：Realize that sample information is same using compensation of delay means or 1588 clock synchronization mode of IEEE
Step.
Further, described right using compensation of delay means or IEEE 1588 in the multistage line differential protection method
When mode realize that sample information is synchronous, specially：
The optical line terminal according to internal crystal oscillator, be synchronized with external GPS or big dipper clock, export pulse per second (PPS) or to Times
Text is to the protected host；
The sampling pulse of the protected host is synchronized with pulse per second (PPS) or the clock synchronization message of the optical line terminal；
The optical network unit is realized by the pulse per second (PPS) of compensation of delay means or IEEE 1588 and the optical line terminal
Synchronous clock synchronization, and export pulse per second (PPS) or clock synchronization message；
The sampling pulse of the protection slave is synchronized with pulse per second (PPS) or the clock synchronization message of the optical network unit.
From the above technical scheme, a kind of multistage route differential protective system provided by the invention and method.It is described more
Section route include：Bulk Supply Substation equipped with main bus-bar and main circuit breaker, equipped with from bus and from the several from substation of breaker,
And it is connected to the Bulk Supply Substation and the transmission line of electricity between substation, the system comprises：Protected host, protection
Slave, optical line terminal, optical network unit and optical fiber；The protected host and the optical line terminal are set to the Bulk Supply Substation
Interior, the protection slave and the optical network unit are set to described out of substation, and the protected host passes through the optical link
Terminal is connect with the optical fiber, and the protection slave is connect by the optical network unit with the optical fiber, and the optical fiber is by one
Root fibre core is constituted.The method includes：The protected host acquires the first electrical quantity according to main bus-bar；The protected host receives
Second electrical quantity, second electrical quantity are the protection slaves according to described from bus synchronous acquisition；The protected host
Difference current is calculated according to first electrical quantity and second electrical quantity；The protected host is according to the differential electricity
Stream judges whether the multistage route breaks down.The present invention utilizes the quick steady of the point-to-point communication of Ethernet passive optical network
Fixed time-delay characteristics and network scalability, optical line terminal can by passive optical splitters and multiple optical network units it
Between communicated, protected for route differential current, especially T wiring even multiple spot T link, only with a fibre core
Can realization device distal end configuration and information call, save a large amount of fiber resource.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of multistage route differential protective system structural schematic diagram exemplified according to implementation；
Fig. 2 is another multistage route differential protective system structural schematic diagram exemplified according to implementation；
Fig. 3 is a kind of multistage line differential protection method flow chart exemplified according to implementation；
Fig. 4 is according to the schematic diagram for implementing the fixation polling cycle exemplified and dynamic bandwidth allocation mechanism.
It illustrates：
Wherein, 1- Bulk Supply Substation, 2- main bus-bar, 3- main circuit breaker, 4- protected host, 5- transmission line of electricity, 6- optical fiber, 7- from
Substation, 8- protect slave, 11- optical line terminal, 12- optical network unit from breaker, 10- from bus, 9-.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Whole description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
According to the first aspect of the invention, a kind of multistage route differential protective system is provided.
Embodiment one
Referring to Fig. 1, present embodiments providing a kind of multistage route differential protective system, the multistage route includes：If
There is the Bulk Supply Substation 1 of main bus-bar 2 and main circuit breaker 3, equipped with from bus 8 and from the several from substation 7, Yi Jilian of breaker 9
It is connected to the Bulk Supply Substation 1 and the transmission line of electricity 5 between substation 7, the system comprises：Protected host 4, protection from
Machine 10, optical line terminal 11, optical network unit 12 and optical fiber 6；
The protected host 4 and the optical line terminal 11 are set in the Bulk Supply Substation 1；
The protection slave 10 and the optical network unit 12 are set to described out of substation 7；
The protected host 4 is connect by the optical line terminal 11 with optical fiber 6；
The protection slave 10 is connect by the optical network unit 12 with optical fiber 6；
The optical fiber 6 is made of a fibre core；
The protected host 4 is used to acquire the first electrical quantity according to the main bus-bar 2；Receive the second electrical quantity；According to institute
It states the first electrical quantity and difference current is calculated in second electrical quantity；The multistage route is judged according to the difference current
Whether break down；If the multistage line failure, the protected host 4 issues the main circuit breaker 3 and described
From the trip signal of breaker 9；
The protection slave 10 be used for according to described in from 8 synchronous acquisition of bus described in the second electrical quantity.
A kind of course of work of multistage route differential protective system of the invention is：Protect slave 10 by synchronous acquisition from
Second electrical quantity of bus 8, and it is sent to protected host 4 by passive optical network in real time.Protected host 4 is according to main bus-bar 2
The second electrical quantity that the first electrical quantity and light the protection slave 10 of acquisition transmit, calculates difference current, to differentiate the multi-section-line
Whether break down on road.If multistage line failure, main circuit breaker 3 is jumped and from breaker 9 with isolated fault.
The present invention can be expanded using the time-delay characteristics and network of the fast and stable of the point-to-point communication of Ethernet passive optical network
Malleability, an optical line terminal can be by being communicated, for route point between passive optical splitters and multiple optical network units
Phase current differential protection, especially T wiring even multiple spot T link, only with a fibre core can the distal end of realization device match
It sets and is called with information, save a large amount of fiber resource.
Further, in the multistage route differential protective system, the optical line terminal 11 and the optical-fiber network list
First 12 transmission commercial datas.The optical line terminal 11 and optical network unit 12 for supporting Ethernet passive optical network are different from tradition
For family online, the optical line terminal 11 and optical network unit 12 of commercial data are only transmitted, management function can be relatively simple
Change, realizes quick, the reliable transmission of the high-precise synchronization and message between optical line terminal 11 and optical network unit 12.
Further, in the multistage route differential protective system, the optical line terminal 11 and the optical-fiber network list
Member 12 is made of special chip or field programmable gate array.Optical line terminal 11 and 12 management function of optical network unit are relatively simple
Change, quick, the reliable transmission of high-precise synchronization and message between existing optical line terminal 11 and optical network unit 12.
Embodiment two
Referring to Fig. 2, present embodiments providing another multistage route differential protective system, optical line terminal 11 is built in
The protected host 4；Optical network unit 12 is built in the protection slave 10；Multistage line differential protection provided in this embodiment
The multistage route differential protective system that the other structures of system are provided referring to embodiment one, details are not described herein.
From the above technical scheme, a kind of multistage route differential protective system provided by the invention.The multistage route
Including：Bulk Supply Substation 1 equipped with main bus-bar 2 and main circuit breaker 3, equipped with from bus 8 and from the several from substation 7 of breaker 9,
And it is connected to the Bulk Supply Substation 2 and the transmission line of electricity 5 between substation 7, the system comprises：Protected host 4,
Protect slave 10, optical line terminal 11, optical network unit 12 and optical fiber 6；The protected host 4 and the optical line terminal 11 are set
In in the Bulk Supply Substation 1；The protection slave 10 and the optical network unit 12 are set to described out of substation 7；The guarantor
Shield host 4 is connect by the optical line terminal 11 with optical fiber 6；The protection slave 10 passes through the optical network unit 12 and light
Fibre 6 connects；The optical fiber 6 is made of a fibre core.The present invention utilizes the quick of the point-to-point communication of Ethernet passive optical network
Stable time-delay characteristics and network scalability, an optical line terminal can pass through passive optical splitters and multiple optical network units
Between communicated, protected for route differential current, especially T wiring even multiple spot T link, only with a fibre
Core can realization device distal end configuration and information call, save a large amount of fiber resource.
According to the second aspect of the invention, a kind of multistage line differential protection method is provided.
Referring to Fig. 3, present embodiments providing a kind of multistage line differential protection method, it to be used for the first aspect of the present invention
The multistage route differential protective system of offer, the described method comprises the following steps：
Step S1, protected host acquires the first electrical quantity according to main bus-bar；
Step S2, protected host receives the second electrical quantity, second electrical quantity be the protection slave according to from
Bus synchronous acquisition；
Step S3, difference current is calculated according to first electrical quantity and second electrical quantity in protected host；
Step S4, protected host judges whether the multistage route breaks down according to the difference current；
If the multistage line failure, executes S5；
Step S5, protected host issues the main circuit breaker and the trip signal from breaker；
The present invention can be expanded using the time-delay characteristics and network of the fast and stable of the point-to-point communication of Ethernet passive optical network
Malleability, an optical line terminal can be by being communicated, for route point between passive optical splitters and multiple optical network units
Phase current differential protection, especially T wiring even multiple spot T link, only with a fibre core can the distal end of realization device match
It sets and is called with information, save a large amount of fiber resource.
Further, in the multistage line differential protection method, protected host 4 receives the second electrical quantity, specially：Institute
It states and electric quantity information is exchanged by proprietary protocol between optical line terminal 11 and the optical network unit 12, or pass through IEC
61850 agreements exchange SMV, GOOSE message and MMS message.With the exchange of 61850 agreement of IEC between route protection host and slave
SMV, GOOSE message and MMS message realize that the protection of route differential current calculates with above-mentioned message, realize that route protection is remote
Side's configuration and information are called.
Further, in the multistage line differential protection method, the optical line terminal 11 and the optical network unit
SMV, GOOSE message and MMS message are exchanged by 61850 agreement of IEC between 12, specially：The SMV, the GOOSE report
The literary and described MMS message bandwidth allocation is using the method for fixing polling cycle and Dynamic Bandwidth Allocation.Using fixed polling cycle
Solves in IEC61850 agreement SMV, GOOSE and MMS message for communication rapidity, reliable with the method for Dynamic Bandwidth Allocation
The coordination problem of property；Ensure that 4000 points per second of SMV transmit at equal intervals, whether GOOSE message switching value conjugates can with dynamic interval
By transmission, while ensuring the efficiency of transmission of MMS message.
Further, in the multistage line differential protection method, the SMV, GOOSE message and MMS message bandwidth point
With the method using fixed polling cycle and Dynamic Bandwidth Allocation, specially：
A kind of new REPORT is arranged to upload and/or GATE issuing mechanism, upstream bandwidth is divided into the SMV, described
Three priority, the SMV highest priority are arranged in GOOSE message, the MMS message three classes, and the GOOSE message is taken second place,
The MMS message is minimum.
Referring to Fig. 4, optical line terminal issues GATE twice to each optical network unit and awards in each polling cycle
Power, the GATE authorization issued for the first time includes highest priority traffic (SMV) bandwidth authorizing, such as G1, G2, G'1, G'2, second
The GATE authorization issued includes the bandwidth authorizing of middle priority service (GOOSE message) and low priority traffice (MMS message), such as
Gs1, Gs2, Gs'1 and Gs'2.
Optical network unit 1 (ONU1) is in G1 authorized window, upload SMV first, and one is and then uploaded after SMV
REPORT message when optical network unit bandwidth application, is separately applied for that optical line terminal receives ONU1 upload by three priority levels
REPORT message when, the application of SMV bandwidth is allocated immediately first, and issue an authorization G'1 to ONU1；Similarly, light
Network unit 2 (ONU2) does same processing in G2 authorized window；Receive what all optical network units uploaded in optical line terminal
After REPORT message, count in all optical network units, low priority bandwidth application, plan as a whole bandwidth allocation, and will in, it is low excellent
The bandwidth of first grade traffic assignments is issued by Gs'1, Gs'2 authorization and reports to corresponding optical network unit.
This algorithm is according to the REPORT message received in n-th polling cycle, to band in (N+1) a polling cycle
Width is dynamically distributed.It can be seen that dynamic bandwidth allocation algorithm calculating treatmenting time from above-mentioned principles illustrated, and be not take up band
Any idle bandwidth waste is not present in wide resource in the entire Dynamic Bandwidth Allocation period.
This algorithm uses three sub-distribution of bandwidth issuing mechanism twice：Optical line terminal is preferential by tri- kinds of SMV, GOOSE and MMS
Grade is sequentially completed the bandwidth allocation to three types business；High priority SMV service bandwidth individually uses a GATE entitlement message
It issues；In, low priority GOOSE, MMS service bandwidth, cause to occupy excessive downlink in order to avoid frequently issuing GATE message excessively
Bandwidth resources, GOOSE, MMS service bandwidth are merged into a GATE authorization and are issued.
Each dynamic bandwidth polling cycle is artificially divided into two sections by this algorithm：SMV uploads part Tup and GOOSE, MMS
Part Tdown is uploaded, Tdba=Tup+Tdown, it is schematically illustrate such as Fig. 1 institute that when initialization sets Tup=TN/2, Tup and Tdown
Show.Within the Tup period, when optical line terminal receives the REPORT message of optical network unit upload, immediately in REPORT
Highest priority traffic (SMV) bandwidth application of application is authorized, and issues an authorization GATE to optical network unit, and more
Tup value in new polling cycle once；At the end of Tup window, optical line terminal starts to count all optical network units uploads
GOOSE, MMS bandwidth application, first successively to middle priority service (GOOSE message) bandwidth of all optical network unit applications
Application carries out bandwidth allocation, then again successively to low priority traffice (MMS message) bandwidth of the application of all optical network units
Application carries out bandwidth allocation, and finally GOOSE, MMS bandwidth authorizing are merged into an authorization GATE and are handed down to corresponding light
Network unit.
Wherein, Tup is that SMV uploads part；Tdown is GOOSE, and MMS uploads part；SV1, SV2 are respectively ONU1, ONU2
SMV in n-th BDA polling cycle；R1, R2 are respectively the REPORT report of ONU1, ONU2 in n-th BDA polling cycle
Text；G1, G2 are respectively that OLT is handed down to ONU1, ONU2 in the N+1 BDA polling cycle in n-th BDA polling cycle
The authorized window for being used for transmission SV1, SV2；GOOSE1, MMS1, GOOSE2, MMS2 are respectively ONU1, ONU2 in n-th BDA
GOOSE message and MMS message in polling cycle；Gs1, Gs2 are respectively that OLT is handed down in n-th BDA polling cycle
ONU1, ONU2 are for the authorized window for being used for transmission GOOSE1, MMS1, GOOSE2, MMS2 in the N+1 BDA polling cycle.
Using two kinds of bandwidth authorizings, three kinds of different bandwidth priority distribution；Wherein first bandwidth authorizing is used for IEC
61850 SMV transmission, GOOSE message and MMS message transmission of second bandwidth authorizing for 61850 agreement of IEC, the two punching
Preferential bandwidth allocation is to GOOSE message when prominent.Why two kinds of bandwidth authorizings are used, is in order to ensure each polling cycle first
Interior, all optical network units can obtain window authorization, guarantee real-time and reliability that each SMV is uploaded.By GOOSE and MMS
Authorization unification, be to improve communication efficiency to reduce authorization expense, in second authorization, when GOOSE and MMS bandwidth Shen
When please conflict, band preference is distributed into GOOSE message, is the requirement in order to ensure GOOSE message to real-time.
Further, in the multistage line differential protection method, second electrical quantity is described protection slave 10
According to described from 8 synchronous acquisition of bus, specially：Sample information is realized using compensation of delay means or ieee standard clock synchronization mode
It is synchronous.Using compensation of delay means or ieee standard clock synchronization mode realize sample information synchronize can make calculate difference current more
Accurately, it avoids generating error since the time is inaccurate.
Further, described right using compensation of delay means or IEEE 1588 in the multistage line differential protection method
When mode realize that sample information is synchronous, specially：
The optical line terminal 11 according to internal crystal oscillator, be synchronized with external GPS or big dipper clock, export pulse per second (PPS) or clock synchronization
Message is to the protected host 4；
The sampling pulse of the protected host 4 is synchronized with pulse per second (PPS) or the clock synchronization message of the optical line terminal 11；
The pulse per second (PPS) that the optical network unit 12 passes through compensation of delay means or ieee standard and the optical line terminal 11
It realizes synchronous clock synchronization, and exports pulse per second (PPS) or clock synchronization message；
The sampling pulse of the protection slave 10 is synchronized with pulse per second (PPS) or the clock synchronization message of the optical network unit 12.
The optical line terminal being connected with protected host is according to a local clock or time counter, by a sampling period
When generating a cycle sampling instant sequence, and will include sampling instant, sampling period, trip path time delay or downlink path
The synchronized sampling information prolonged is handed down to and protects the optical network unit of slave, and slave sampling instant is all produced by host optical line terminal
It gives birth to and issues, slave generates periodic samples pulse according to this synchronized sampling information；
From the above technical scheme, a kind of multistage route differential protective system provided by the invention and method.It is described more
Section route include：Bulk Supply Substation 1 equipped with main bus-bar 2 and main circuit breaker 3, equipped with from bus 8 and from the several from change of breaker 9
Power station 7, and it is connected to the Bulk Supply Substation 2 and the transmission line of electricity 5 between substation 7, the system comprises：Protection
Host 4, protection slave 10, optical line terminal 11, optical network unit 12 and optical fiber 6；The protected host 4 and the optical link are whole
End 11 is set in the Bulk Supply Substation 1；The protection slave 10 and the optical network unit 12 are set to described out of substation 7；
The protected host 4 is connect by the optical line terminal 11 with optical fiber 6；The protection slave 10 passes through the optical network unit
12 connect with optical fiber 6；The optical fiber 6 is made of a fibre core.The method includes：The protected host 4 is adopted according to main bus-bar 2
Collect the first electrical quantity；The protected host 4 receives the second electrical quantity, and second electrical quantity is the protection slave 10 according to institute
It states from 8 synchronous acquisition of bus；Difference is calculated according to first electrical quantity and second electrical quantity in the protected host 4
Streaming current；The protected host 4 judges whether the multistage route breaks down according to the difference current；If the multistage
Line failure, then the protected host 4 issues the main circuit breaker 3 and the trip signal from breaker 9.The present invention
Utilize the time-delay characteristics and network scalability of the fast and stable of the point-to-point communication of Ethernet passive optical network, an optical link
Terminal can be protected by being communicated between passive optical splitters and multiple optical network units for route differential current,
Especially T wiring even multiple spot T link, only with a fibre core can realization device distal end configuration and information call, section
Save a large amount of fiber resource.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to of the invention its
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the invention, these modifications, purposes or
Person's adaptive change follows general principle of the invention and including the undocumented common knowledge in the art of the present invention
Or conventional techniques.The description and examples are only to be considered as illustrative, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be understood that the present invention is not limited to the precise structure already described above and shown in the accompanying drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is limited only by the attached claims.
Claims (9)
1. a kind of multistage route differential protective system, the multistage route include：Equipped with the main transformer of main bus-bar and main circuit breaker electricity
Stand, equipped with from bus and from the several from substation of breaker, and be connected to the Bulk Supply Substation and it is described from substation it
Between transmission line of electricity, which is characterized in that the system comprises：Protected host, protection slave, optical line terminal, optical network unit
And optical fiber；
The protected host and the optical line terminal are set in the Bulk Supply Substation；
The protection slave and the optical network unit are set to described out of substation；
The protected host is connect by the optical line terminal with the optical fiber；
The protection slave is connect by the optical network unit with the optical fiber；
The optical fiber is made of a fibre core；
The protected host is used to acquire the first electrical quantity according to the main bus-bar；Receive the second electrical quantity；According to described first
Difference current is calculated in electrical quantity and second electrical quantity；Judge whether the multistage route is sent out according to the difference current
Raw failure；If the multistage line failure, the protected host issues the main circuit breaker and described from breaker
Trip signal；
The protection slave be used for according to described in from bus synchronous acquisition described in the second electrical quantity.
2. multistage route differential protective system according to claim 1, which is characterized in that the optical line terminal and described
Optical network unit only transmits commercial data.
3. multistage route differential protective system according to claim 1, which is characterized in that the optical line terminal and described
Optical network unit is made of special chip or field programmable gate array.
4. a kind of multistage line differential protection method is used for multistage route differential protective system described in claim 1, feature
It is, the described method comprises the following steps：
Protected host acquires the first electrical quantity according to main bus-bar；
The protected host receives the second electrical quantity, and second electrical quantity is protection slave according to from bus synchronous acquisition；
Difference current is calculated according to first electrical quantity and second electrical quantity in the protected host；
The protected host judges whether the multistage route breaks down according to the difference current；
If the multistage line failure, the protected host issues main circuit breaker and the trip signal from breaker.
5. according to the method described in claim 4, it is characterized in that, the protected host receives the second electrical quantity, specially：Institute
It states and electric quantity information is exchanged by proprietary protocol between optical line terminal and the optical network unit, or assisted by IEC 61850
View exchange SMV, GOOSE message and MMS message.
6. according to the method described in claim 5, it is characterized in that, leading between the optical line terminal and the optical network unit
61850 agreement of IEC exchange SMV, GOOSE message and MMS message are crossed, specially：The SMV, the GOOSE message and described
MMS message bandwidth allocation is using the method for fixing polling cycle and Dynamic Bandwidth Allocation.
7. according to the method described in claim 6, it is characterized in that, the SMV, GOOSE message and MMS message bandwidth allocation are adopted
With the method for fixed polling cycle and Dynamic Bandwidth Allocation, specially：
The new REPORT upload of one kind is set and/or GATE issuing mechanism, upstream bandwidth are divided into the SMV, the GOOSE report
Three priority, the SMV highest priority are arranged in literary, the described MMS message three classes, and the GOOSE message is taken second place, the MMS
Message is minimum.
8. according to the method described in claim 4, it is characterized in that, second electrical quantity is protection slave according to same from bus
Step acquisition, specially：Realize that sample information is synchronous using compensation of delay means or ieee standard clock synchronization mode.
9. according to the method described in claim 8, it is characterized in that, described use compensation of delay means or ieee standard clock synchronization side
Formula realizes that sample information is synchronous, specially：
The optical line terminal according to internal crystal oscillator, be synchronized with external GPS or big dipper clock, export pulse per second (PPS) or clock synchronization message extremely
The protected host；
The sampling pulse of the protected host is synchronized with pulse per second (PPS) or the clock synchronization message of the optical line terminal；
The optical network unit is realized synchronous by the pulse per second (PPS) of compensation of delay means or ieee standard and the optical line terminal
Clock synchronization, and export pulse per second (PPS) or clock synchronization message；
The sampling pulse of the protection slave is synchronized with pulse per second (PPS) or the clock synchronization message of the optical network unit.
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| CN108023338B (en) * | 2017-11-28 | 2019-02-26 | 国网浙江省电力公司台州供电公司 | The judgment method of differential protection for multiterminal T connection electric transmission line |
| EP3771058B1 (en) * | 2019-07-25 | 2023-08-23 | Siemens Aktiengesellschaft | Differential protection for an electric network |
Citations (4)
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|---|---|---|---|---|
| JP2001327066A (en) * | 2000-05-16 | 2001-11-22 | Takaoka Electric Mfg Co Ltd | Protective relay device with photocurrent sensor |
| CN101877676A (en) * | 2010-06-30 | 2010-11-03 | 中国电力科学研究院 | Method for judging change of differential protection route according to change of unidirectional transmission delay |
| CN103746304A (en) * | 2013-12-25 | 2014-04-23 | 长园深瑞继保自动化有限公司 | Reconstruction method of intelligent transformer station |
| CN105896489A (en) * | 2016-05-11 | 2016-08-24 | 许继集团有限公司 | Differential protection method and system for multi-end T connected transmission line |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7123459B2 (en) * | 2003-04-07 | 2006-10-17 | Schweitzer Engineering Laboratories, Inc. | Protective relay capable of protection applications without protection settings |
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|---|---|---|---|---|
| JP2001327066A (en) * | 2000-05-16 | 2001-11-22 | Takaoka Electric Mfg Co Ltd | Protective relay device with photocurrent sensor |
| CN101877676A (en) * | 2010-06-30 | 2010-11-03 | 中国电力科学研究院 | Method for judging change of differential protection route according to change of unidirectional transmission delay |
| CN103746304A (en) * | 2013-12-25 | 2014-04-23 | 长园深瑞继保自动化有限公司 | Reconstruction method of intelligent transformer station |
| CN105896489A (en) * | 2016-05-11 | 2016-08-24 | 许继集团有限公司 | Differential protection method and system for multi-end T connected transmission line |
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