CN112421566A - Pilot differential protection method based on Ethernet precision time protocol - Google Patents
Pilot differential protection method based on Ethernet precision time protocol Download PDFInfo
- Publication number
- CN112421566A CN112421566A CN202011247555.8A CN202011247555A CN112421566A CN 112421566 A CN112421566 A CN 112421566A CN 202011247555 A CN202011247555 A CN 202011247555A CN 112421566 A CN112421566 A CN 112421566A
- Authority
- CN
- China
- Prior art keywords
- differential protection
- differential
- data
- protection device
- ethernet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/28—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
- H02H3/30—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus using pilot wires or other signalling channel
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides a pilot differential protection method based on an Ethernet precision time protocol, which comprises the following steps: initializing an Ethernet module for differential data communication into a general data transmission mode, enabling a Precision Time Protocol (PTP) of the module, starting a precision time tag function of an Ethernet Media Access Control (MAC) module, and constructing a differential data network; connecting a plurality of differential protection devices by using a differential data network, and autonomously identifying a host and a slave in the plurality of differential protection devices; sampling and synchronizing each differential protection device in the differential data network; each differential protection device finishes the acquisition of analog quantity data at equal intervals according to the clock pace of the differential protection device, sets a sampling tag MARK number for the acquired data, transmits the data in a multicast mode through a differential data channel, and receives the acquired data which is sent by other differential protection devices on the differential data channel and is provided with the sampling tag MARK number; each differential protection device performs differential protection judgment.
Description
Technical Field
The invention relates to the technical field of relay protection and automation of a power system, in particular to a pilot differential protection method based on an Ethernet precision time protocol.
Background
The pilot current differential protection is evolved on the basis of current differential protection, the basic protection principle is based on kirchhoff current law, the pilot current differential protection can ideally realize protection in a unitized mode, the principle is simple, the pilot current differential protection is not influenced by the change of the operation mode, and the operation reliability is improved because the differential protection devices on all sides are not in electrical connection. The current differential protection is largely used on elements, circuits and buses of an electric power system at present, has the advantages of high sensitivity, simple, reliable and quick action, capability of adapting to oscillation and non-full-phase operation of the electric power system and the like, and is incomparable with other protection forms. The premise of realizing the longitudinal current differential protection is that differential protection devices on all sides are connected through a specific communication network, data sampling on all sides is synchronous, and a simple and reliable data communication network and a high-precision data synchronization method are core technologies of longitudinal differential protection. Various synchronization technologies used at present are seriously influenced by network change, need a special network or depend on an external clock source; at present, conventional longitudinal differential protection needs special optical fiber communication network support, synchronous measurement is realized through a complex software synchronization algorithm and even by the aid of FPGA hardware, the requirement on hardware is high, and the popularization and application of longitudinal differential are influenced; more importantly, the method is suitable for a multi-terminal system, the realization of the protection function of the local terminal needs to depend on the calculation and analysis result of the opposite terminal, and the protection independence is not enough.
Disclosure of Invention
The object of the present invention is to solve at least one of the technical drawbacks mentioned.
Therefore, the invention aims to provide a pilot differential protection method based on an Ethernet precision time protocol.
In order to achieve the above object, an embodiment of the present invention provides a pilot differential protection method based on an ethernet precision time protocol, including the following steps:
step S1, initializing the Ethernet module for differential data communication to initialize to a general data transmission mode, enabling the precision time protocol PTP of the Ethernet MAC module for differential data communication, and enabling the precision time label function of the Ethernet MAC module to construct a differential data network;
step S2, constructing a differential data network, connecting a plurality of differential protection devices by using the differential data network, and autonomously identifying a master and a slave in the plurality of differential protection devices;
step S3, sampling and synchronizing each differential protection device in the differential data network, and synchronizing respective sampling number MARK values to be consistent with the host, wherein the MARK value of each differential protection device is automatically added by one when the MARK value is added once;
step S4, after sampling synchronization of each differential protection device, when each differential protection device moves according to its own crystal oscillator, sampling synchronization confirmation is carried out;
step S5, each differential protection device finishes the collection of analog quantity data at equal intervals according to the clock pace of the differential protection device, sets a sampling label MARK number for the collected data, then sends the collected data with the sampling label MARK number in a multicast mode through a differential data channel, receives the collected data with the sampling label MARK number sent by other differential protection devices on the differential data channel, and stores the collected data in a local sampling buffer area according to the label MARK number in an alignment way;
and step S6, each differential protection device carries out differential protection judgment according to the data collected by the differential protection device and the sampling data transmitted by other differential protection devices.
Further, each differential protection device is assigned a unique device ID number, each differential protection device in the differential data network autonomously undergoes network data exchange, the differential protection device with the smallest device ID number is autonomously identified as a master, and the remaining differential protection devices are slaves.
Further, in step S4, the differential protection devices are connected by the differential data channel, and sampling synchronization is confirmed according to a preset period, so as to ensure that the sampling synchronization difference of the differential protection devices in the network is smaller than a preset value.
Further, in the step S6,
wherein Ie is the rated current of the line load:
id > Icd (split-phase differential constant) when Ir < ═ mIe acts (1)
Action (2) when mIe < Ir < nIe (Id-Icd) >0.5 (Ir-mIe)
When Id- [0.5 (nIe-mIe) + Icd ] >0.8 (Ir-nIe) is observed when Ir > - (nIe) (3)
In the above formula: id ═ i1+i2+…+ik|，Ir＝(|i1|+|i2|+…+|ik1.2, |), m ═ 1.2, and n ═ 3, where i is1、i2、…、ikThe current collected for the differential protection device.
Further, the differential protection device uses ethernet as a data channel network, wherein the ethernet uses an optical fiber network or an RJ45 twisted pair network.
Further, the differential protection device may be a plurality of differential protection devices.
The invention simplifies the pilot differential synchronization method by using the precise time protocol of the Ethernet, so that the sampling clock of the protection device at each end of the differential protection system does not depend on any external clock source, the algorithm is simplified, the requirement on hardware is greatly reduced, the pilot, fast and high-precision synchronization is realized, a special differential protection communication network is not needed any more, meanwhile, the high-speed and high-capacity data transmission capability of the Ethernet is used for realizing the original sampling data transmission of each side, more information is provided for the protection calculation of each side, the independence of the protection judgment of each side is improved, and the fault recording function of each side to the whole network can be realized. The method is applicable to fiber optic Ethernet and also applicable to cable Ethernet. The pilot differential protection system realized by the mode can realize a multi-terminal system.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flowchart of a pilot differential protection method based on Ethernet precision time protocol according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a sample synchronization process according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a three-terminal differential system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The invention provides a pilot differential protection method based on an Ethernet precision time protocol, which utilizes a universal Ethernet and the precision time protocol thereof to realize a high-precision and rapid pilot differential protection method. The method is based on a universal Ethernet, utilizes the Precision Time Protocol (PTP) function of an Ethernet MAC (media Access control) unit of a differential protection device, greatly simplifies the prior differential protection implementation method, accurately measures the sampling time deviation between different differential protection devices in the network, and utilizes the high-speed and large-capacity data transmission capability of the Ethernet, thereby realizing the synchronization of sampling data between different devices and realizing the high-precision and quick longitudinal differential function. The sampling synchronization precision between each differential protection device in the differential protection network system can reach 10 mu s.
It should be noted that the differential protection device provided by the present invention uses ethernet as a data channel network, wherein the ethernet uses an optical fiber network or an RJ45 twisted pair network.
As shown in fig. 1, the pilot differential protection method based on the ethernet precision time protocol according to the embodiment of the present invention includes the following steps:
step S1, initializing the ethernet module for differential data communication to initialize to the universal data transmission mode, enabling the ethernet module for differential data communication, and enabling the precise time tag function of the ethernet MAC module to construct the differential data network.
Specifically, in this step, the universal data transmission mode is initialized, and at the same time, a Precision Time Protocol (PTP) of the ethernet module is enabled, and a precision time tag function of the ethernet MAC module is enabled.
And step S2, constructing a differential data network, connecting the plurality of differential protection devices by using the differential data network, and automatically identifying the master and the slave in the plurality of differential protection devices.
Specifically, each differential protection device is assigned a unique device ID number, each differential protection device in the differential data network autonomously undergoes network data exchange, the differential protection device with the smallest device ID number is autonomously identified as the master, and the remaining differential protection devices are slaves.
In the above steps, by using a Precision Time Protocol (PTP) function of the ethernet MAC module and a time scale for receiving and transmitting a tag message, the device automatically identifies its own identity in the network through a unique ID number in the network (for example, the master with the smallest ID number and all other devices are slaves), the slaves in the network accurately measure a difference in sampling time between itself and the master, and the slaves adjust their own sampling time to achieve synchronization with the master, thereby achieving sampling synchronization.
Step S3, performing sampling synchronization on each differential protection device in the differential data network, and synchronizing that the respective sample number MARK value is consistent with the host, wherein the MARK value of each differential protection device is automatically increased by one every time the sample is increased, and modulo 256 is cycled.
In step S4, after sampling synchronization of the differential protection devices, when each differential protection device operates according to its own crystal oscillator, sampling synchronization is confirmed.
In this step, the differential protection devices are connected by a differential data channel, and sampling synchronization confirmation is performed according to a preset period, so as to ensure that the sampling synchronization difference of the differential protection devices in the network is smaller than a preset value.
In the embodiment of the present invention, the preset period is, for example, wid 2s, and the preset value is, for example, 10 μ s.
That is, after the sampling synchronization of each differential protection device is completed, when each differential protection device goes according to its own crystal oscillator, the whole network of differential protection devices connected by the differential data channel performs synchronization confirmation according to 2S one period, and the sampling synchronization difference of each differential protection device in the network is ensured to be less than 10 μ S. The setting of the optimal synchronization confirmation time window is adopted, the deviation is found in time, the adjustment is carried out in time, the synchronization error of each end of data is ensured to be within 10us, and the time is associated with the system characteristics and cannot be set at will.
It should be noted that, the preset period and the preset value are both examples, and a user may adjust the setting according to needs.
In the invention, after each differential protection device in the network completes the synchronization of the sampling time of the differential protection device and the host, the differential protection device negotiates with the host for a consistent sampling value MARK label which is used as the basis for the alignment of the data used by the differential protection function of the device, each protection device automatically samples according to the clock of the protection device after the synchronization is adjusted, the MARK label increases the membrane 256 cycle according to the sampling sequence number, and simultaneously, each secondary clock device and the middle main clock device perform sampling synchronization confirmation every 2S interval, thereby ensuring that the sampling synchronization difference of each differential protection device in the network is less than 10 mu S.
Step S5, each differential protection device finishes the collection of analog data at equal intervals according to the clock pace of the differential protection device, sets a sampling label MARK number for the collected data, then sends the value of 4 sampling points marked with the MARK number through a differential data channel in a multicast mode at every interval of 4 sampling points, and sends out the Ethernet message type according to the message length (IEEE802.3 length), which is the best combination of fully utilizing the big data transmission capability and the data timeliness of the Ethernet. And receiving the collected data with the sampling tag MARK number sent by other differential protection devices on the differential data channel, and storing the collected data into the local sampling buffer area according to the tag MARK number alignment, thereby forming a sampling data set of each branch of the whole differential protection system and carrying out differential and other protection function calculation. By utilizing the sampling data set, fault recording of the system can be realized on each device, waveform analysis can also be realized through the sampling data, and the CT saturation degree of each side is judged to realize a rapid longitudinal differential protection function.
And step S6, each differential protection device carries out differential protection judgment according to the data collected by the differential protection device and the sampling data transmitted by other differential protection devices.
Wherein Ie is the rated current of the line load:
id > Icd (split-phase differential constant) when Ir < ═ mIe acts (1)
Action (2) when mIe < Ir < nIe (Id-Icd) >0.5 (Ir-mIe)
When Id- [0.5 (nIe-mIe) + Icd ] >0.8 (Ir-nIe) is observed when Ir > - (nIe) (3)
In the above formula: id ═ i1+i2+…+ik|，Ir＝(|i1|+|i2|+…+|ik1.2, |), m ═ 1.2, and n ═ 3, where i is1、i2、…、ikThe current collected for the differential protection device.
The differential protection method of the present invention will be described below with reference to fig. 2 and 3, taking a three-terminal differential system of three differential protection devices as an example.
An RTDS model is established, an optical difference protection device is respectively installed at a position T1, a position T2 and a position T3, and the model outputs three-phase circuit currents (Ia, Ib and Ic) at the installation position of the device and is connected to the corresponding differential protection device.
The 3 devices are connected by the network cable through the switch, and the device IDs of three devices T1, T2, and T3 are 1, 2, and 3, respectively. After the setting is finished, the 3 devices are electrified again, and the system enters a differential protection operation process:
(1) after 3 devices in the differential system are powered on, each device initializes the Ethernet for differential communication into a differential data channel according to the design of hardware drive, enables a Precision Time Protocol (PTP) of the module and enables the function of a precision time tag of an Ethernet MAC module. After the initialization of the data channel is completed, 3 devices acquire the number of differential protection devices on the network and the respective ID values thereof to be 1, 2 and 3 through a general information message, because the ID number of the T1 device is minimum, the T1 device is used as a master attribute to participate in synchronization, and the T2 and the T3 devices are slave attribute devices;
(2) the T2 and T3 devices complete sampling synchronization with the T1 devices themselves and data MARK labels are consistent according to the steps shown in fig. 1 through the ethernet channel. The method comprises the following specific steps:
(2.1) three devices T1, T2 and T3 in the network issue a universal data message (void message) through a differential data network, and inform other devices in the network of own ID numbers and unsynchronized attributes;
(2.2) in 3S after the device is powered on, three devices in the differential data network all receive the universal data message from the other two devices, establish respective differential device lists, determine respective master-slave machine attributes, open a differential sampling data buffer space, determine that the T1 device is the master identity and prepare for synchronizing with the slave, determine that the T2 and the T3 are slave identities and respectively send RQSATSTA synchronization request messages to the master T1, and the differential data channel MAC of the T3 and the T2 protection devices records respective T1 moments when the messages are sent;
(2.3) the MAC of the T1 device automatically records the corresponding T2 when receiving SYNRQSSTA messages of the T2 and T3 devices, records the T3 moment after receiving the SYNRQSSTA messages of the slave devices, processes the synchronization requests of the slave devices, forms the corresponding SYNACKA messages and sends the SYNACKA messages to the MAC (the messages contain the T2 and T3 moment records and sampling data labels MARK), and the host MAC automatically adds the T4 moment and sends the SYNACKA messages to the slave devices when sending the SYNACKA messages;
(2.4) when the MAC of the T2 and T3 devices receives a message sent by the T1 device, automatically recording the time T5 at which the message arrives, recording the time T6 after the first sampling interruption after the synca message of the T1 host is received, and then determining the difference between the sampling time of the MAC and the sampling time of the host T1 and MARK number according to formulas 1 and 2 in fig. 1 and adjusting the differences to be consistent according to T1, T5 and T6 recorded by the slave devices T2 and T3 and the times T2, T3 and T4 in the received message;
(2.5) after the T2 and T3 devices finish the synchronization of sampling time and MARK labels, the universal data message (void message) is issued through the differential data network to inform other devices in the network that the synchronization is finished. Thereafter, normal sample data (marked with MARK) is sent to the network, and normal protection operations are started by receiving sample data of other devices.
(3) The system completes clock synchronization in 1S, and three devices (T1, T2 and T3) respectively display synchronization marks. Then, the 3 differential protection devices respectively operate and sample according to the crystal oscillators of the 3 differential protection devices. Carrying out a synchronous confirmation process every 2S in the differential protection operation process consisting of 3 differential protection devices to ensure that the clock difference of each differential protection device in the network is less than 10 mu S;
(4) after sampling synchronization is completed, 3 devices respectively carry out data acquisition at regular intervals according to a preset sampling rate (in the embodiment, 1000Hz), and print an up-sampling MARK for the data of each sampling point and store the data into a sampling buffer area, meanwhile, the Ethernet message type is sent out (a packet of 4 sampling point data) according to the message length (IEEE802.3 length) through a differential data channel in a multicast mode according to the time interval of 4 sampling points, and the sampling buffer area at the local end is aligned and stored according to the tag number to form a sampling data set of each branch of the whole differential protection system;
(5) each differential protection device finishes differential protection judgment according to sampling data collected by the differential protection device and from other protection devices transmitted by the differential protection device through a network, and the criterion is as follows:
wherein Ie is the rated current of the line load:
id > Icd (split-phase differential constant) when Ir < ═ mIe acts (1)
Action (2) when mIe < Ir < nIe (Id-Icd) >1 (Ir-mIe)
When Id- [1 (nIe-mIe) + Icd ] >1.2 (Ir-nIe) is represented by Ir > -nIe (3)
In the above formula: id ═ i1+i2+i3|，Ir＝(|i1|+|i2|+|i31.2, |), m ═ 1.2, and n ═ 3, where i is1、i2、i3The current collected by the differential protection devices T1, T2 and T3 respectively.
And (3) the actions of the formulas (1), (2) or (3) are satisfied, otherwise, the actions are not performed.
The device synchrophasor angular deviation on each side was less than 1 ° in the above experiment. Two-phase short circuit faults at K1 are simulated through an RTDS system, and 3 devices can reliably act; simulating a K2 fault, 3 devices may all be reliable.
According to the pilot differential protection method based on the Ethernet precision time protocol, the differential protection can be realized through the universal Ethernet, the requirement of the differential protection on hardware is reduced, the synchronization precision is improved, and the pilot differential protection method can adapt to a multi-terminal system; meanwhile, the protection function calculation of each end is independent, and each end can realize the fault recording of the whole network.
The invention simplifies the pilot differential synchronization method by using the precise time protocol of the Ethernet, so that the sampling clock of the protection device at each end of the differential protection system does not depend on any external clock source, the algorithm is simplified, the requirement on hardware is greatly reduced, the pilot, fast and high-precision synchronization is realized, a special differential protection communication network is not needed any more, meanwhile, the high-speed and high-capacity data transmission capability of the Ethernet is used for realizing the original sampling data transmission of each side, more information is provided for the protection calculation of each side, the independence of the protection judgment of each side is improved, and the fault recording function of each side to the whole network can be realized. The method is applicable to fiber optic Ethernet and also applicable to cable Ethernet. The pilot differential protection system realized by the mode can realize a multi-terminal system.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A pilot differential protection method based on an Ethernet precision time protocol is characterized by comprising the following steps:
step S1, initializing the Ethernet module for differential data communication to initialize to a general data transmission mode, enabling the precision time protocol PTP of the Ethernet MAC module for differential data communication, and enabling the precision time label function of the Ethernet MAC module to construct a differential data network;
step S2, constructing a differential data network, connecting a plurality of differential protection devices by using the differential data network, and autonomously identifying a master and a slave in the plurality of differential protection devices;
step S3, sampling and synchronizing each differential protection device in the differential data network, and synchronizing respective sampling number MARK values to be consistent with the host, wherein the MARK value of each differential protection device is automatically added by one when the MARK value is added once;
step S4, after sampling synchronization of each differential protection device, when each differential protection device moves according to its own crystal oscillator, sampling synchronization confirmation is carried out;
step S5, each differential protection device finishes the collection of analog quantity data at equal intervals according to the clock pace of the differential protection device, sets a sampling label MARK number for the collected data, then sends the collected data with the sampling label MARK number in a multicast mode through a differential data channel, receives the collected data with the sampling label MARK number sent by other differential protection devices on the differential data channel, and stores the collected data in a local sampling buffer area according to the label MARK number in an alignment way;
and step S6, each differential protection device carries out differential protection judgment according to the data collected by the differential protection device and the sampling data transmitted by other differential protection devices.
2. The ethernet precision time protocol-based pilot differential protection method according to claim 1, wherein in step S2, each differential protection device is assigned a unique device ID number, each differential protection device in the differential data network autonomously undergoes network data exchange, the differential protection device with the smallest self-identification device ID number is a master, and the remaining differential protection devices are slaves.
3. The ethernet precision time protocol-based pilot differential protection method according to claim 1, wherein in step S4, each differential protection device is connected by a differential data channel, and sample synchronization confirmation is performed according to a preset period to ensure that the difference of sample synchronization of each differential protection device in the network is smaller than a preset value.
4. The Ethernet precision time protocol-based pilot differential protection method according to claim 1, wherein in the step S6,
wherein Ie is the rated current of the line load:
id > Icd (split-phase differential constant) when Ir < ═ mIe acts (1)
Action (2) when mIe < Ir < nIe (Id-Icd) >0.5 (Ir-mIe)
When Id- [0.5 (nIe-mIe) + Icd ] >0.8 (Ir-nIe) is observed when Ir > - (nIe) (3)
In the above formula: id ═ i1+i2+…+ik|，Ir＝(|i1|+|i2|+…+|ik1.2, |), m ═ 1.2, and n ═ 3, where i is1、i2、…、ikThe current collected for the differential protection device.
5. The tandem differential protection method based on the Ethernet precision time protocol as claimed in claim 1, wherein the differential protection device uses Ethernet as a data channel network, wherein the Ethernet uses a fiber network or an RJ45 twisted pair network.
6. The Ethernet precision time protocol-based pilot differential protection method of claim 1, wherein the number of the differential protection devices is multiple.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011247555.8A CN112421566B (en) | 2020-11-10 | 2020-11-10 | Pilot differential protection method based on Ethernet precision time protocol |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011247555.8A CN112421566B (en) | 2020-11-10 | 2020-11-10 | Pilot differential protection method based on Ethernet precision time protocol |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112421566A true CN112421566A (en) | 2021-02-26 |
| CN112421566B CN112421566B (en) | 2022-06-17 |
Family
ID=74781221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011247555.8A Active CN112421566B (en) | 2020-11-10 | 2020-11-10 | Pilot differential protection method based on Ethernet precision time protocol |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112421566B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230246438A1 (en) * | 2022-01-30 | 2023-08-03 | Schneider Electric Industries Sas | Data alignment method, differential protector and differential protection system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4855861A (en) * | 1987-11-12 | 1989-08-08 | Asea Brown Boveri Ab | Longitudinal differential protection |
| CN101841446A (en) * | 2010-05-25 | 2010-09-22 | 许继集团有限公司 | Pilot channel transmission device, optical fiber differential protective device and method |
| CN102072996A (en) * | 2010-11-15 | 2011-05-25 | 河北省电力研究院 | System for realizing automatic digital protection and closed loop moving die test |
| CN103001199A (en) * | 2012-12-12 | 2013-03-27 | 绍兴电力局 | Ethernet-based current differential protection device and implementation method thereof |
| CN103533066A (en) * | 2013-10-21 | 2014-01-22 | 国家电网公司 | Method for receiving, transmitting and synchronizing fiber longitudinal differential data through process level device |
-
2020
- 2020-11-10 CN CN202011247555.8A patent/CN112421566B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4855861A (en) * | 1987-11-12 | 1989-08-08 | Asea Brown Boveri Ab | Longitudinal differential protection |
| CN101841446A (en) * | 2010-05-25 | 2010-09-22 | 许继集团有限公司 | Pilot channel transmission device, optical fiber differential protective device and method |
| CN102072996A (en) * | 2010-11-15 | 2011-05-25 | 河北省电力研究院 | System for realizing automatic digital protection and closed loop moving die test |
| CN103001199A (en) * | 2012-12-12 | 2013-03-27 | 绍兴电力局 | Ethernet-based current differential protection device and implementation method thereof |
| CN103533066A (en) * | 2013-10-21 | 2014-01-22 | 国家电网公司 | Method for receiving, transmitting and synchronizing fiber longitudinal differential data through process level device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230246438A1 (en) * | 2022-01-30 | 2023-08-03 | Schneider Electric Industries Sas | Data alignment method, differential protector and differential protection system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112421566B (en) | 2022-06-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101645869B (en) | Switch with submicrosecond clock and switching processing method thereof | |
| Hasan et al. | Phase offset analysis of asymmetric communications infrastructure in smart grid | |
| CN102315985A (en) | Time synchronization precision test method for intelligent device adopting IEEE1588 protocols | |
| WO2012075881A1 (en) | Ieee1588-based sampled value multi-interface synchronization system for multiple slave clocks | |
| CN112421566B (en) | Pilot differential protection method based on Ethernet precision time protocol | |
| WO2012149811A1 (en) | Method, terminal and system for measuring asymmetric delay of transmission link | |
| CN104468247A (en) | Method and device for acquiring networking transmission network time delay of sampling value of intelligent transformer substation | |
| US20160065358A1 (en) | Synchronization method, intermediate node, and slave node of communication network system | |
| JP2019534609A (en) | Network management information receiving / transmitting method, apparatus, transmitting apparatus, and receiving apparatus | |
| CN103001721A (en) | Application of precision time protocol to smart substation | |
| CN112671598B (en) | Special algorithm hardware module for electric power suitable for electric power system control protection device | |
| CN107483134B (en) | A kind of inter-network clock synchronous communication device and method between heterogeneous networks | |
| CN103580845B (en) | A kind of clock synchronizing method based on virtual switch cluster and device | |
| CN105959315B (en) | A kind of IP keepalive method and client for user's migration | |
| CN102546146B (en) | Method for setting a plurality of clocks in merging unit in digital substation, and application of method | |
| CN106549822B (en) | Method and device for testing response time of time synchronization message and test equipment | |
| Qi et al. | Design and implementation of IEEE1588 time synchronization messages timestamping based on FPGA | |
| CN103399508A (en) | Synchronous triggering management device and synchronous triggering management method | |
| CN103051487A (en) | Test method based on network measurement and control system time synchronous protocol in power industry | |
| CN112532279A (en) | Method, device and system for acquiring data transmission time | |
| CN109739189A (en) | Based on CANopen communications protocol multi-axle motor control method | |
| CN115967644A (en) | Switch security testing method facing time sensitive network | |
| Dong et al. | Design and Implementation of AS6802 Clock Synchronization System in TTE thernet | |
| CN102045154B (en) | Method and system for synchronizing data of power equipment as well as power resource management server | |
| Xu et al. | Profibus automation technology and its application in DP slave development |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |