CN112803361A - Method and device for checking consistency of receiving and transmitting delays of optical fiber differential protection channel on line - Google Patents
Method and device for checking consistency of receiving and transmitting delays of optical fiber differential protection channel on line Download PDFInfo
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- 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
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- 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
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- 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
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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Abstract
The invention relates to a method and a device for checking consistency of receiving and sending time delay of an optical fiber differential protection channel on line, wherein messages with sending time are sent and received to opposite sides respectively through two sides of the optical fiber differential protection channel, channel time delay is calculated respectively according to the sending time and the time of receiving the messages, consistency checking is carried out on the channel time delay calculated respectively, so that whether the channel receiving and sending time delay of the devices on two sides is consistent or not can be clearly compared, whether differential protection is opened or closed can be known according to the checking result, the problem that the reliability of line differential protection is reduced when the receiving and sending time delay of the channels on two sides of an optical fiber longitudinal channel of a line protection device is inconsistent is solved, the risk of protection misoperation caused by the fact that the receiving and sending time delay of the channels are inconsistent when an external fault is avoided, a real-time monitoring means is provided for consistency of the receiving and sending time delay of the channels, and the reliability of data, thereby ensuring the performance of differential protection.
Description
Technical Field
The invention relates to the technical field of power system relay protection, in particular to a method and a device for checking the consistency of receiving and sending delays of an optical fiber differential protection channel on line.
Background
The relay protection signal is required to meet the requirements of reliability, selectivity, sensitivity and speed, and the action time of relay protection is directly related to the safety of a power grid, so that the requirement of optical fiber differential protection of a line protection device on the transmission delay of a channel is very strict. In the optical fiber longitudinal channels of the line protection devices on the two sides, due to inconsistent time delay generated by each link, the receiving and sending time delay of the longitudinal channels on the two sides is inconsistent, and the reliability of sampling data synchronization and differential protection is seriously influenced.
In addition, in the conventional line protection device, the synchronous adjustment of the optical fiber channels is performed based on the consistency of the channel receiving and transmitting delays and the stability of the channel delays. When the receiving and sending delays of the device channels on the two sides are not consistent, the calculation of data synchronization and differential protection differential flow on the two sides of the line is influenced, the risk of protection maloperation exists, and the reliability is influenced.
The on-line checking and calculating the consistency of the receiving and sending delays of the optical fiber differential protection channels is a technical problem to be solved urgently in the field.
Disclosure of Invention
Based on the above situation in the prior art, an object of the present invention is to provide a method for on-line checking and calculating consistency of transceiving delays of an optical fiber differential protection channel, so as to solve the problem of reliability reduction of line differential protection caused by inconsistent transceiving delays of channels on two sides of an optical fiber longitudinal channel of a line protection device.
To achieve the above object, according to an aspect of the present invention, there is provided a method for checking consistency of transmit-receive delay of an optical fiber differential protection channel on line, comprising the steps of:
sending a first message to a channel opposite side end, wherein the first message comprises a current sending time value Ts1；
Receiving a second message sent by the opposite side end, wherein the second message comprises a time value T for sending the second messages2And a first delay Tdelta1Said first delay time Tdelta1From the opposite side end according to Ts1And the time value T of the first message received by itd1Calculating to obtain;
according to the receiving time T of receiving the second messaged2And the time value T when the channel sends the second message to the side ends2Calculating a second delay Tdelta2；
According to a first delay Tdelta1And a second delay Tdelta2Calculating the delay difference DeltaTd：
ΔTd＝|Tdelta2-Tdelta1|
Determination of Delta TdWhether it is greater than a predetermined threshold value TmkIf T isdGreater than TmkIf yes, locking the differential protection and sending out an alarm signal; if TdLess than or equal to TmkThen the differential protection is opened.
Further, according to Ts1And Td1Calculating to obtain Tdelta1Comprises calculating T according to the following formuladelta1：
Tdelta1＝Td1-Ts1。
Further, according to Ts2And Td2Calculating to obtain Tdelta2Comprises calculating T according to the following formuladelta2：
Tdelta2＝Td2-Ts2。
Further, before sending the first message, the method further comprises the following steps:
judging whether the current time is the whole second time, if so, resetting the timing and sending a message; if not, the timer is incremented by one unit and the step is re-executed.
Further, the determination of Δ TdWhether it is greater than a predetermined threshold value TmkBefore, still include the step:
sending and receiving messages multiple times to calculate Tdelta1And Tdelta2And separately find Tdelta1And Tdelta2Using said Tdelta1And Tdelta2Is calculated as Δ Td。
According to a second aspect of the present invention, a device for checking consistency of transceiving delays of an optical fiber differential protection channel on line is provided, which includes a transmitting module, a receiving module, and a main protection module; wherein
The sending module sends a first message to the opposite side end of the channel, wherein the first message comprises a current sending time value Ts1；
The receiving module receives a second message sent by the opposite end, wherein the second message comprises a time value T for sending the second messages2And a first delay Tdelta1；
The main protection module is respectively connected with the sending module and the receiving module and used for receiving the receiving time T of the second messaged2And the time value T when the channel sends the second message to the side ends2Calculating a second delay Tdelta2(ii) a And the number of the first and second groups,
according to a first delay Tdelta1And a second delay Tdelta2Calculating the delay difference DeltaTd：
ΔTd＝Tdelta2-Tdelta1
And according to Δ TdWhether it is greater than a predetermined threshold value TmkThe determination result of (1) performs locking or opening differential protection.
Further, the device also comprises a counter module;
the counter module judges whether the current time is the whole second time, if so, the counter module resets the timing and starts the sending module and the receiving module; if not, increasing the timing by one unit and judging again.
Further, the main protection module is based on Δ TdWhether it is greater than a predetermined threshold value TmkThe method for performing locked or unlocked differential protection according to the judgment result comprises the following steps: if TdGreater than TmkIf yes, locking the differential protection and sending out an alarm signal; if TdLess than or equal to TmkThen the differential protection is opened.
According to a third aspect of the present invention, there is provided an optical fiber differential protection channel system, comprising an optical fiber differential protection channel and at least two optical fiber differential line protection devices; wherein,
the at least two optical fiber differential circuit protection devices are arranged on two sides of the optical fiber differential protection channel, and each optical fiber differential circuit protection device comprises a device for checking consistency of receiving and sending time delay of the optical fiber differential protection channel on line according to the second aspect of the invention.
To sum up, the present invention provides a method and apparatus for on-line checking consistency of transceiving delays of an optical fiber differential protection channel, wherein, messages with sending time are sent and received to opposite sides respectively through two sides of the optical fiber differential protection channel, channel delays are calculated respectively according to the sending time and the time of receiving the messages, and consistency checking is performed on the channel delays calculated respectively, so as to clearly compare whether the channel transceiving delays of the devices on the two sides are consistent, and know whether to open or close differential protection according to the checking result, thereby solving the problem of reduced reliability of line differential protection caused by inconsistent transceiving delays of the channels on the two sides of an optical fiber longitudinal channel of a line protection device, avoiding the risk of protection malfunction caused by inconsistent transceiving delays of the channels when an out-of-area fault occurs, and providing a real-time monitoring means for consistency of the channel transceiving delays, and the reliability of data synchronization at two sides of the channel is improved, and the performance of differential protection is further ensured.
Drawings
FIG. 1 is a flow chart of a method for checking consistency of receiving and transmitting delays of an optical fiber differential protection channel on line according to the present invention;
FIG. 2 is a schematic diagram of a method for checking consistency of transmit-receive delay of an optical fiber differential protection channel on line according to the present invention;
fig. 3 is a block diagram of the device for checking consistency of transceiving delay of the optical fiber differential protection channel on line according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. According to an embodiment of the present invention, there is provided a method for checking consistency of transceiving delays of an optical fiber differential protection channel on line, the method having a flowchart as shown in fig. 1, and the method being implemented by a corresponding module in any one of protection devices at two ends of the differential protection channel, the method including the steps of:
firstly, judging whether the current time is the whole second time, if so, resetting the timing and sending a message; if not, the timer is incremented by one unit and the step is re-executed.
Sending a first message to a channel opposite side end, wherein the first message comprises a current sending time value Ts1。
Receiving a second message sent by the opposite side end, wherein the second message comprises a time value T for sending the second messages2And a first delay Tdelta1Said first delay time Tdelta1From the opposite side end according to Ts1And the time value T of the first message received by itd1Calculated, T can be calculated according to the following formuladelta1：
Tdelta1＝Td1-Ts1。
According to the receiving time T of receiving the second messaged2And the time value T when the channel sends the second message to the side ends2Calculating a second delay Tdelta2T can be calculated according to the following formuladelta2：
Tdelta2＝Td2-Ts2。
According to a first delay Tdelta1And a second delay Tdelta2Calculating the delay difference DeltaTd：
ΔTd＝|Tdelta2-Tdelta1|。
To obtain more accurate results, T may be calculated by sending and receiving messages multiple timesdelta1And Tdelta2And separately find Tdelta1And Tdelta2And converting the average value to actualTime quantum to obtain channel one-way transmission delay, and sending packet to calculate delta T by using average valued。
Determination of Delta TdWhether it is greater than a predetermined threshold value TmkIf T isdGreater than TmkIf yes, locking the differential protection and sending out an alarm signal; if TdLess than or equal to TmkThen the differential protection is opened. T ismkThe setting can be performed according to the actual requirement of the relay protection system, for example, the setting is 0.1 ms.
The schematic diagram of the method is shown in FIG. 2, S represents the time line of the sending end, D represents the time line of the receiving end, and the time delay T of the sending end is calculated at the sending end according to the sending time and the receiving time in the message of the receiving enddelta1、Tdelta2……Tdeltan。
According to a second embodiment of the present invention, there is provided an apparatus for checking consistency of transmit-receive delay of an optical fiber differential protection channel online, which is shown in fig. 3, and includes a counter module, a transmitting module, a receiving module, and a main protection module. The modules can be arranged on two sides of the optical fiber differential protection channel, and in order to ensure accurate calculation results, devices on two sides of the circuit adopt the same time synchronization mode, for example, FPGA decoding can be adopted to generate a second reference as a time reference of the devices on two sides. Meanwhile, the devices on both sides maintain an internal counter locally, and the counter is cleared by taking the second generated by time synchronization and decoding as a reference. The devices on the two sides do not need to be replaced, and no extra device is needed to calculate the receiving and transmitting delay difference of the pilot channel.
The counter module is used for judging whether the current time is the whole second time or not, resetting the timing if the current time is the whole second time, and starting the sending module and the receiving module; if not, increasing the timing by one unit and judging again. That is, the local apparatus transmits a special message frame including a time value at the entire second time after detecting the second reference.
The sending module sends a first message to the opposite side end of the channel after detecting the second reference, wherein the first message comprises the current sending time value Ts1. The opposite side receiving module is receivingWhen the first message arrives, the opposite main protection module receives the time T according to the currentd1Calculating a second delay Tdelta1And sends it with the sending time T of the second messages2Encapsulated together in a second message.
A receiving module, configured to receive a second packet sent by the peer end, where the second packet includes a time value T for sending the second packets2And a first delay Tdelta1。
A main protection module respectively connected with the sending module and the receiving module and used for receiving the receiving time T of the second messaged2And the time value T when the channel sends the second message to the side ends2Calculating a second delay Tdelta2(ii) a And the number of the first and second groups,
according to a first delay Tdelta1And a second delay Tdelta2Calculating the delay difference DeltaTd：
ΔTd＝Tdelta2-Tdelta1
And according to Δ TdWhether it is greater than a predetermined threshold value TmkPerforms locked or unlocked differential protection, specifically if TdGreater than TmkIf yes, locking the differential protection and sending out an alarm signal; if TdLess than or equal to TmkThen the differential protection is opened.
According to a third embodiment of the present invention, there is provided an optical fiber differential protection channel system, which includes an optical fiber differential protection channel and at least two optical fiber differential line protection devices. The at least two optical fiber differential circuit protection devices are arranged on two sides of the optical fiber differential protection channel, and each optical fiber differential circuit protection device comprises a device for checking consistency of transceiving delay of the optical fiber differential protection channel on line according to the second embodiment of the invention, so as to realize consistency check of delay of the optical fiber differential protection channel.
To sum up, the invention relates to a method and a device for checking consistency of transceiving delays of an optical fiber differential protection channel on line, wherein messages with sending time are sent and received to opposite sides respectively through two sides of the optical fiber differential protection channel, channel delays are respectively calculated according to the sending time and the time of receiving the messages, consistency checking is carried out on the respectively calculated channel delays, so that whether the channel transceiving delays of the devices on the two sides are consistent or not can be clearly compared, whether differential protection is opened or closed or not can be known according to the checking result, the problem that the reliability of line differential protection is reduced when the transceiving delays of the channels on the two sides of an optical fiber longitudinal link channel of a line protection device are inconsistent is solved, the risk of protection misoperation caused by the inconsistent transceiving delays of the channels when an external fault occurs is avoided, and a real-time monitoring means is provided for the consistency of the transceiving delays of the channels, and the reliability of data synchronization at two sides of the channel is improved, and the performance of differential protection is further ensured.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (9)
1. A method for checking consistency of receiving and sending delay of an optical fiber differential protection channel on line is characterized by comprising the following steps:
sending a first message to a channel opposite side end, wherein the first message comprises a current sending time value Ts1；
Receiving a second message sent by the opposite side end, wherein the second message comprises a time value T for sending the second messages2And a first delay Tdelta1Said first delay time Tdelta1From the opposite side end according to Ts1And the time value T of the first message received by itd1Calculating to obtain;
according to the receiving time T of receiving the second messaged2And the time value T when the channel sends the second message to the side ends2Calculating a second delay Tdelta2；
According to a first delay Tdelta1And a second delay Tdelta2Calculating the delay difference DeltaTd：
ΔTd＝|Tdelta2-Tdelta1|
Determination of Delta TdWhether it is greater than a predetermined threshold value TmkIf T isdGreater than TmkIf yes, locking the differential protection and sending out an alarm signal; if TdLess than or equal to TmkThen the differential protection is opened.
2. The method of claim 1, wherein the method is based on Ts1And Td1Calculating to obtain Tdelta1Comprises calculating T according to the following formuladelta1：
Tdelta1＝Td1-Ts1。
3. The method of claim 1, wherein the method is based on Ts2And Td2Calculating to obtain Tdelta2Comprises calculating T according to the following formuladelta2：
Tdelta2＝Td2-Ts2。
4. A method according to claim 2 or 3, further comprising, before sending the first message, the steps of:
judging whether the current time is the whole second time, if so, resetting the timing and sending a message; if not, the timer is incremented by one unit and the step is re-executed.
5. The method of claim 4, wherein determining Δ T is performeddWhether it is greater than a predetermined threshold value TmkBefore, still include the step:
sending and receiving messages multiple times to calculate Tdelta1And Tdelta2And separately find Tdelta1And Tdelta2Using said Tdelta1And Tdelta2Average value ofCalculating Delta Td。
6. A device for checking consistency of receiving and sending time delay of an optical fiber differential protection channel on line is characterized by comprising a sending module, a receiving module and a main protection module; wherein
The sending module sends a first message to the opposite side end of the channel, wherein the first message comprises a current sending time value Ts1；
The receiving module receives a second message sent by the opposite end, wherein the second message comprises a time value T for sending the second messages2And a first delay Tdelta1；
The main protection module is respectively connected with the sending module and the receiving module and used for receiving the receiving time T of the second messaged2And the time value T when the channel sends the second message to the side ends2Calculating a second delay Tdelta2(ii) a And the number of the first and second groups,
according to a first delay Tdelta1And a second delay Tdelta2Calculating the delay difference DeltaTd：
ΔTd＝Tdelta2-Tdelta1
And according to Δ TdWhether it is greater than a predetermined threshold value TmkThe determination result of (1) performs locking or opening differential protection.
7. The apparatus of claim 6, further comprising a counter module;
the counter module judges whether the current time is the whole second time, if so, the counter module resets the timing and starts the sending module and the receiving module; if not, increasing the timing by one unit and judging again.
8. The apparatus of claim 7, wherein the main protection module is based on Δ TdWhether it is greater than a predetermined threshold value TmkThe method for performing locked or unlocked differential protection according to the judgment result comprises the following steps: if TdGreater than TmkThen locking differential protectionProtecting and sending out an alarm signal; if TdLess than or equal to TmkThen the differential protection is opened.
9. An optical fiber differential protection channel system is characterized by comprising an optical fiber differential protection channel and at least two optical fiber differential circuit protection devices; wherein,
the at least two optical fiber differential circuit protection devices are arranged on two sides of the optical fiber differential protection channel, and each optical fiber differential circuit protection device comprises a device for checking consistency of transceiving delay of the optical fiber differential protection channel on line according to any one of claims 6 to 8.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114050559A (en) * | 2021-11-18 | 2022-02-15 | 南京南瑞继保电气有限公司 | Method and device for judging inconsistency of receiving and transmitting delays of differential channel and differential protection communication system |
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| CN114826724A (en) * | 2022-04-20 | 2022-07-29 | 网易（杭州）网络有限公司 | Data processing method and device, electronic equipment and storage medium |
| CN114826724B (en) * | 2022-04-20 | 2024-04-09 | 网易（杭州）网络有限公司 | Data processing method, device, electronic equipment and storage medium |
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Application publication date: 20210514 |