CN113964800A - Wireless differential protection method under different operation and fault throttling modes - Google Patents
Wireless differential protection method under different operation and fault throttling modes Download PDFInfo
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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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The invention discloses a wireless differential protection method under the mode of distinguishing operation and fault throttling.A line protection device adopts wireless communication, data transmission adopts HDLC messages, the protection device normally carries out protection starting judgment and adds channel starting judgment; during normal operation, namely when the protection is not started and the channel is not started, sending a heartbeat message, wherein the sending frequency is second level; after protection starting or channel starting, immediately adjusting the sending frequency, simultaneously adjusting the sent data content to be a starting message, starting any side to be quickly sent, and adjusting the sending frequency to be millisecond level; the conditions of the differential protection outlet are that the local side differential element acts, the local side protection is started, and meanwhile, the opposite side protection is started, or the local side or the opposite side channel voltage is started, or the opposite side three-phase switches are all in jumping positions. By adopting the invention, on one hand, the communication flow is saved, and the flow cost generated by differential protection service is reduced; on the other hand, the differential protection action speed in the weak feed mode is optimized.
Description
Technical Field
The invention belongs to the field of relay protection of power systems, and particularly relates to a wireless differential protection method under the mode of distinguishing operation from fault throttling.
Background
The pilot current differential protection is widely applied to line protection, two or more line protection devices are required to transmit synchronous data, and high requirements are provided for rapidity, instantaneity, stability and reliability of a transmission channel due to the requirements of rapidity and reliability of relay protection. With the development of 5G communication technology, the bandwidth, communication rate, stability and reliability of wireless network data transmission are continuously improved, and wireless transmission channels gradually start to be applied to the field of power communication.
The line protection devices in operation transmit data in real time, and the transmission period of the data message is in the magnitude of 1ms, so that a large amount of data can be transmitted with each other along with the long-time operation of the equipment. When the 5G wireless communication mode is applied to the line protection pilot channel data transmission, the optimal flow control is required for economy.
The conventional pilot current differential protection requires that the actions of the protection starting elements on two sides and the differential element on the side are allowed to be carried out to carry out the differential protection outlet, in a weak feed mode, after the weak feed side receives the opposite side protection starting, the weak feed starting element is judged according to some auxiliary judging conditions, and then a protection starting mark is sent to the strong current side, so that the strong current side receives the protection starting mark on the weak feed side and needs at least twice channel delay time, and when the channel delay is longer, the action speed of the protection outlet can be greatly influenced.
Disclosure of Invention
The invention aims to provide a wireless differential protection method under the mode of distinguishing operation from fault throttling, and aims to solve the problems that the line protection is operated for a long time, the channel transmission data volume is huge, the flow consumption is high, and the weak feed side protection is started to lag behind the time of one channel delay under the condition of weak feed, so that the strong current side differential protection outlet time is more lagged.
In order to achieve the purpose, the invention adopts the following technical scheme:
a wireless differential protection method under the mode of distinguishing operation and fault throttling is disclosed, wherein, wireless communication is adopted between line protection devices, HDLC messages are adopted for data transmission, and the method comprises the following steps:
responding to the situation that the local side protection, the local side channel, the opposite side protection and the opposite side channel are not started, the local side sends a first heartbeat message to the opposite side, the opposite side sends a second heartbeat message to the local side, and the sending frequency is second level;
responding to the protection start of the local side or the channel start of the local side, the local side adjusts the sending frequency to millisecond level and adjusts the sending data from a first heartbeat message to a first start message;
responding to a protection starting mark or a channel starting mark in the first starting message, starting opposite side protection or opposite side channels, adjusting the sending frequency to millisecond level, and adjusting the sending data from a second heartbeat message to a second starting message;
and judging whether to allow the local side differential protection outlet or not according to the first starting message and the second starting message.
Further, the method for judging the starting of the channel at the side comprises the following steps:
if the local side meets any one of channel voltage starting, channel TWJ (jump relay) deflection starting and channel long jump starting, the channel of the local side is started and the set time is widened.
Further, the method for judging the channel voltage start-up comprises the following steps:
and if any one of low-voltage starting, zero-sequence voltage starting, phase voltage sudden change starting and zero-sequence voltage sudden change starting is met, starting the channel voltage and widening the set time.
Further, the low-voltage start is judged if the local-side phase voltage or the inter-phase voltage is lower than a set threshold value, the zero-sequence start is judged if the local-side zero-sequence voltage is greater than the set threshold value, the phase voltage abrupt start is judged if the local-side phase voltage or the inter-phase voltage abrupt change is greater than the set threshold value, and the zero-sequence voltage abrupt start is judged if the local-side zero-sequence voltage abrupt change is greater than the set threshold value.
Further, the method for judging the TWJ displacement start of the channel comprises the following steps: and if any single-phase TWJ deflection or three-phase TWJ deflection exists, starting the channel TWJ deflection and widening the set time.
Further, the method for judging the channel long jump starting comprises the following steps:
when the side protects the opposite side of the long jump, the channel of the side is started for the long jump and the set time is widened.
Further, the first start message further includes a three-phase current sampling value, a three-phase current fourier value, a three-phase voltage fourier value, three single-phase TWJ positions or three-phase TWJ positions, an absolute time scale and a differential protection related mark at the current time of the current side, where the channel start mark includes any one or more of a channel voltage start mark, a channel TWJ start mark, and a channel long jump start mark;
the second starting message comprises a three-phase current sampling value, a three-phase current Fourier value, a three-phase voltage Fourier value, a protection starting mark, a channel starting mark, three single-phase TWJ positions or three-phase TWJ positions, an absolute time scale and a differential protection related mark at the opposite side at the current moment, wherein the channel starting mark comprises any one or more of a channel voltage starting mark, a channel TWJ starting mark and a channel long jump starting mark.
Further, the determining whether to allow the local side differential protection egress according to the first start packet and the second start packet includes:
judging whether the differential element of the local side acts or not according to the three-phase current sampling value, the three-phase current Fourier value, the three-phase voltage Fourier value and the differential protection related mark of the local side at the current moment;
judging whether the three-phase switches on the opposite side are all jumping positions according to the three single-phase TWJ positions or the three-phase TWJ positions on the opposite side;
responding to the action of the local side differential element and the starting of the opposite side protection, or the action of the local side differential element and the starting of the local side protection and the starting of the local side channel voltage, or the action of the local side differential element and the starting of the local side protection and the starting of the opposite side channel voltage, or the action of the local side differential element and the starting of the local side protection and the jumping of the opposite side three-phase switch, and the exit of the local side differential protection.
Further, the conditions for judging whether the three-phase switches on the opposite side are all in the jumping position are as follows: in the second start message, all three single-phase TWJ are 1 or three-phase TWJ is 1.
Further, the first heartbeat message comprises a three-phase current fourier value at the current moment of the current side, a heartbeat message mark, a protection starting mark, a channel starting mark, a three-phase TWJ position and an absolute time scale;
the second heartbeat message comprises a three-phase current Fourier value at the opposite side at the current moment, a heartbeat message mark, a protection starting mark, a channel starting mark, a three-phase TWJ position and an absolute time scale.
Further, the method for judging the start of the local side protection comprises the following steps:
if the local side meets any one of current sudden change starting, zero sequence current starting, static damage starting, weak feed starting and TWJ starting, the local side protects starting and widens the set time.
The invention achieves the following beneficial technical effects:
1) when the power system normally operates, after the optimal flow control logic is adopted, the channel data sending frequency is in the second level in most of time, the total channel transmission data volume during the normal operation of line protection is reduced, and the channel data flow is reduced by about 103The flow overhead is greatly reduced;
2) the channel starting logic can sensitively detect system faults or disturbances, ensures the quick action of differential protection after a line has faults by adjusting the channel data sending frequency in time, and controls the delay error to be in millisecond level;
3) for line protection in a weak feed mode, when a fault occurs in a region, by adopting the outlet optimization logic, the strong current side protection outlet time can be shortened by 1 time of channel delay time, and the strong current side differential protection outlet time can be greatly reduced under the working condition of wireless differential protection;
4) when the system normally operates, the channel monitoring and the monitoring of differential current at two sides of the line can still be carried out through the heartbeat message, so that the reliability of channel transmission is ensured.
Drawings
Fig. 1 is a schematic logic diagram of an implementation of a wireless differential protection method in a differential operation and fault throttling mode according to an embodiment of the present invention.
Detailed Description
The invention is further described with reference to specific examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As described above, in the prior art, there are problems that the line protection operates for a long time, the channel transmission data amount is huge, the traffic consumption is high, the simple reduction of the transmission frequency affects the quick action and reliability of the line differential protection, and the weak feed side protection starts to lag behind the time of one channel delay under the weak feed condition, so that the strong current side differential protection exit time lags further.
Therefore, the embodiment of the invention provides a wireless differential protection method under the mode of differentiating operation and fault throttling, which simplifies the data format, improves the message efficiency and optimizes the differential protection related logic by optimizing the type of the differential protection service message, the message format, the data sending frequency and the data sending rate, so that the data flow is greatly reduced, the performance of the differential protection is not reduced, and the channel monitoring function is still provided.
In the specific embodiment, the optical fiber differential protection service data adopts an HDLC protocol message format, the frame structure is simple, the processing speed is high, and the bandwidth utilization rate is high. The end-to-end communication of differential data is realized by utilizing 5G communication, the HDLC whole frame message is directly encapsulated into an IP message, and the data instantaneity is ensured by adopting a connection-free UDP message.
And the protection device judges whether the protection is started normally. Specifically, the protection start judging method includes: and if any one of the current break variable start, the zero sequence current start, the static damage start, the weak feed start and the TWJ start is met, the start is protected, and the time is widened for a certain time.
And on the basis of protection starting judgment, judging the starting of the channel is added. In specific embodiments, the channel start may include a channel voltage start, a channel TWJ shift start, or a channel long jump start.
The method for judging the channel starting comprises the following steps: and if any one of the channel voltage starting, the channel TWJ deflection starting and the channel long jump starting is met, starting the channel and widening for a certain time.
The method for judging the starting of the channel voltage comprises the following steps: if any one of low-voltage starting, zero-sequence voltage starting, phase voltage sudden change starting and zero-sequence voltage sudden change starting is met, the channel voltage is started and is widened for a certain time.
More specifically, the low-voltage start is determined under the condition that the present-side phase voltage or the inter-phase voltage is lower than a set threshold value.
The judgment condition of the zero sequence voltage starting is that the zero sequence voltage at the side is larger than a set threshold value.
The judgment condition of the sudden change starting of the phase voltage is that the phase voltage or the sudden change quantity of the phase voltage at the current side is larger than a set threshold value.
The judgment condition of the sudden change starting of the zero sequence voltage is that the sudden change quantity of the zero sequence voltage at the side is larger than a set threshold value.
The method for judging the TWJ deflection starting of the channel comprises the following steps: when there is any single phase TWJ shift or three phase TWJ shift, the trigger channel TWJ shift starts and widens for a certain time, e.g. 100 ms.
The method for judging the channel long jump starting comprises the following steps: when the side protects the opposite side of the long jump, the channel of the side is started for the long jump and is widened for a certain time.
Referring to fig. 1, a method for wireless differential protection in a differential operation mode and a differential fault throttling mode according to an embodiment of the present invention may include the following steps:
step 11, in response to that the local side protection, the local side channel, the opposite side protection and the opposite side channel are not started, the local side sends a first heartbeat message to the opposite side, the opposite side sends a second heartbeat message to the local side, and the sending frequency is second level;
during the normal operation of the system, that is, when the protection of the local side and the protection of the opposite side are not started and the channel is not started, heartbeat messages are mutually sent between the local side and the opposite side, that is, the local side sends a first heartbeat message to the opposite side, the opposite side sends a second heartbeat message to the local side, the heartbeat messages are sent in the whole second period, and the sending frequency is in the second level, for example, 1 frame/second.
The first heartbeat message comprises a three-phase current Fourier value at the current moment of the current side, a heartbeat message mark, a protection starting mark, a channel starting mark, a three-phase TWJ position, an absolute time scale and the like. The start flag is 1 and 0 respectively indicating start and non-start, so the protection start flag in the first heartbeat message is 0, and the channel start flag is also 0.
And the second heartbeat message comprises a three-phase current Fourier value at the opposite side at the current moment, a heartbeat message mark, a protection starting mark, a channel starting mark, a three-phase TWJ position, an absolute time scale and the like.
When the system normally operates, the channel monitoring and the monitoring of differential current at two sides of the line can still be carried out through the heartbeat message, so that the reliability of channel transmission is ensured.
Step 12, in response to the start of the local side protection or the start of the local side channel, the local side adjusts the sending frequency to millisecond level and adjusts the sending data from the first heartbeat message to the first start message;
when the system has fault or disturbance, when the local side protection is started or the channel is started, the local side immediately adjusts the sending frequency to millisecond level, for example 1 frame/millisecond, and simultaneously adjusts the sending data content to be a first starting message, and transmits the starting mark of the local side to the opposite side.
The first starting message comprises a three-phase current sampling value, a three-phase current Fourier value, a three-phase voltage Fourier value, a protection starting mark, a channel starting mark, three single-phase TWJ positions or three-phase TWJ positions, an absolute time scale, a differential protection related mark and the like at the current moment of the current side. The channel starting mark comprises any one or more of a channel voltage starting mark, a channel TWJ starting mark and a channel long jump starting mark.
Step 13, responding to a protection starting mark or a channel starting mark in the first starting message, starting opposite side protection or opposite side channels, adjusting the sending frequency to millisecond level, and adjusting the sending data from a second heartbeat message to a second starting message;
and after the opposite side receives the starting mark of the side, the transmitting frequency is also immediately adjusted to be millisecond level, namely, any side is started, and the transmitting frequency is adjusted to be rapid transmission.
The second starting message comprises a three-phase current sampling value, a three-phase current Fourier value, a three-phase voltage Fourier value, a protection starting mark, a channel starting mark, three single-phase TWJ positions or three-phase TWJ positions, an absolute time scale, a differential protection related mark and the like at the opposite side at the current moment. Wherein the channel starting mark comprises any one or more of a channel voltage starting mark, a channel TWJ starting mark and a channel long jump starting mark.
When the system has faults or disturbance, a starting message mode with higher frequency is adopted, so that the quick action of differential protection can be guaranteed.
And step 14, judging whether to allow the local side differential protection outlet according to the first starting message and the second starting message.
The method specifically comprises the following steps:
judging whether the differential element of the local side acts or not according to the three-phase current sampling value, the three-phase current Fourier value, the three-phase voltage Fourier value and the differential protection related mark of the local side at the current moment;
judging whether the three-phase switches on the opposite side are all jumping positions according to the three single-phase TWJ positions or the three-phase TWJ positions on the opposite side;
responding to the action of the local side differential element and the starting of the opposite side protection, or the action of the local side differential element and the starting of the local side protection and the starting of the local side channel voltage, or the action of the local side differential element and the starting of the local side protection and the starting of the opposite side channel voltage, or the action of the local side differential element and the starting of the local side protection and the jumping of the opposite side three-phase switch, and the exit of the local side differential protection.
In one embodiment, the conditions for determining whether the three-phase switches on the opposite side are in the skip position are as follows: in the second start message received by the local side, the three single-phase TWJ are all 1 or the three-phase TWJ is 1.
In one embodiment, the sampling frequency of the current mainstream line protection device is 1200Hz, each frame of data is about 200 bytes or less for HDLC messages, and the header encapsulation of UDP and IP messages is added, each frame of data is about 300 bytes or less, and the data flow rate per second is about 1200 × 300B =360KB, and the data flow rate per day is about 24 × 60 × 360KB ≈ 31GB |!
When the power system operates normally, most of the time is free of faults or disturbances. After the optimal flow control logic is adopted, the channel data sending frequency is in the second level most of the time, and the channel data flow is reduced by about 103And (4) doubling.
The channel starting logic of the invention can sensitively detect system fault or disturbance, adjust channel data sending frequency in time, ensure quick action of differential protection after fault, and control delay error in millisecond level.
For line protection in a weak feed mode, when a fault occurs in a region, a strong current side can be started by a sudden current change amount, the weak feed side possibly cannot meet a current amount starting condition, weak feed starting judgment is required to be carried out according to auxiliary judgment after a protection starting signal of the strong current side is received, then the weak feed starting signal is sent to the strong current side, and a strong current side differential protection outlet is opened. For a special optical fiber channel, the channel delay is about 1ms, the strong current side action time lags behind by 2ms due to the channel delay and can be ignored, but for a wireless channel, the channel delay can reach 10ms level at most, the weak current side differential protection exit time lags behind by 10ms due to the channel delay, and the strong current side exit time lags behind by 20ms due to the channel delay, so that the protection exit time is seriously influenced. After the outlet optimization logic is adopted, the strong current side protection outlet time can be shortened by 1 time, and the strong current side differential protection outlet time can be greatly reduced under the wireless differential protection working condition.
By adopting the method of the invention, when the system normally operates, the channel monitoring and the monitoring of the differential current at two sides of the line can still be carried out through the heartbeat message, thereby ensuring the reliability of channel transmission.
Through the above embodiments, the method of the present invention has the following features and functions:
(1) under the condition of normal operation of the system, the data is transmitted in a heartbeat message mode with lower frequency, the data flow is greatly reduced, and meanwhile, the functions of channel monitoring and system operation abnormity monitoring are still achieved, and the reliability of channel operation and system operation is guaranteed.
(2) When the system has faults or disturbance, a starting message mode with higher frequency is adopted to ensure the quick action of differential protection.
(3) The method comprises the steps of adding channel starting, channel voltage starting, channel TWJ starting and channel long jump starting, optimizing the logic of a differential protection outlet in a weak feedback mode, and accelerating the time of a strong current side differential protection outlet in the weak feedback mode.
On the premise of meeting the relay protection mobility and reliability, the method reduces overall transmission data, saves flow and achieves the effect of optimal flow control, optimizes the start logic of the weak feedback, improves the action speeds of two sides in the weak feedback mode and provides a key step for the popularization of the 5G differential protection service.
The present invention has been disclosed in terms of the preferred embodiment, but is not intended to be limited to the embodiment, and all technical solutions obtained by substituting or converting equivalents thereof fall within the scope of the present invention.
Claims (10)
1. A wireless differential protection method under the mode of distinguishing operation and fault throttling is characterized in that wireless communication is adopted between line protection devices, and HDLC messages are adopted for data transmission, and the method comprises the following steps:
responding to the situation that the local side protection, the local side channel, the opposite side protection and the opposite side channel are not started, the local side sends a first heartbeat message to the opposite side, the opposite side sends a second heartbeat message to the local side, and the sending frequency is second level;
responding to the protection start of the local side or the channel start of the local side, the local side adjusts the sending frequency to millisecond level and adjusts the sending data from a first heartbeat message to a first start message;
responding to a protection starting mark or a channel starting mark in the first starting message, starting opposite side protection or opposite side channels, adjusting the sending frequency to millisecond level, and adjusting the sending data from a second heartbeat message to a second starting message;
and judging whether to allow the local side differential protection outlet or not according to the first starting message and the second starting message.
2. The wireless differential protection method for distinguishing the operation mode from the fault throttling mode according to claim 1, wherein the method for judging the starting of the channel at the side comprises the following steps:
and if the local side meets any one of channel voltage starting, channel TWJ deflection starting and channel long jump starting, the channel of the local side is started and the set time is widened.
3. The wireless differential protection method for distinguishing between an operation mode and a fault throttling mode according to claim 2, wherein the channel voltage starting judgment method comprises the following steps:
and if any one of low-voltage starting, zero-sequence voltage starting, phase voltage sudden change starting and zero-sequence voltage sudden change starting is met, starting the channel voltage and widening the set time.
4. The method according to claim 3, wherein the low-voltage start is determined by that the phase voltage or the phase voltage at the local side is lower than a predetermined threshold value, the zero-sequence start is determined by that the zero-sequence voltage at the local side is higher than the predetermined threshold value, the sudden change of the phase voltage is greater than the predetermined threshold value, and the sudden change of the zero-sequence voltage is greater than the predetermined threshold value.
5. The method for wireless differential protection according to claim 2, wherein the conditions for determining TWJ shift start of the tunnel are as follows: and if any single-phase TWJ deflection or three-phase TWJ deflection exists, starting the channel TWJ deflection and widening the set time.
6. The wireless differential protection method for distinguishing the operation mode from the fault throttling mode according to claim 2, wherein the method for judging the channel long jump starting is as follows:
when the side protects the opposite side of the long jump, the channel of the side is started for the long jump and the set time is widened.
7. The wireless differential protection method under the differentiated operation and fault throttling mode according to claim 1, wherein the first start message further comprises a current-time three-phase current sampling value, a three-phase current fourier value, a three-phase voltage fourier value, three single-phase TWJ positions or three-phase TWJ positions, an absolute time scale and differential protection related marks at the current time of the local side, wherein the channel start mark comprises any one or more of a channel voltage start mark, a channel TWJ start mark and a channel long jump start mark;
the second starting message comprises a three-phase current sampling value, a three-phase current Fourier value, a three-phase voltage Fourier value, a protection starting mark, a channel starting mark, three single-phase TWJ positions or three-phase TWJ positions, an absolute time scale and a differential protection related mark at the opposite side at the current moment, wherein the channel starting mark comprises any one or more of a channel voltage starting mark, a channel TWJ starting mark and a channel long jump starting mark.
8. The method according to claim 7, wherein the determining whether to allow the local-side differential protection egress according to the first start message and the second start message comprises:
judging whether the differential element of the local side acts or not according to the three-phase current sampling value, the three-phase current Fourier value, the three-phase voltage Fourier value and the differential protection related mark of the local side at the current moment;
judging whether the three-phase switches on the opposite side are all jumping positions according to the three single-phase TWJ positions or the three-phase TWJ positions on the opposite side;
responding to the action of the local side differential element and the starting of the opposite side protection, or the action of the local side differential element and the starting of the local side protection and the starting of the local side channel voltage, or the action of the local side differential element and the starting of the local side protection and the starting of the opposite side channel voltage, or the action of the local side differential element and the starting of the local side protection and the jumping of the opposite side three-phase switch, and the exit of the local side differential protection.
9. The wireless differential protection method according to claim 8, wherein the conditions for determining that the three-phase switches on the opposite side are both in the jump position are as follows: in the second start message, all three single-phase TWJ are 1 or three-phase TWJ is 1.
10. The wireless differential protection method under the differentiated operation and fault throttling mode according to claim 1, characterized in that the first heartbeat message comprises a three-phase current fourier value at the current time of the local side, a heartbeat message flag, a protection start flag, a channel start flag, a three-phase TWJ position, and an absolute time scale;
the second heartbeat message comprises a three-phase current Fourier value at the opposite side at the current moment, a heartbeat message mark, a protection starting mark, a channel starting mark, a three-phase TWJ position and an absolute time scale.
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| CN114629092A (en) * | 2022-04-11 | 2022-06-14 | 国网江苏省电力有限公司无锡供电分公司 | Method and system for realizing rapid action under wireless differential protection weak feedback condition |
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| CN101431230A (en) * | 2008-12-17 | 2009-05-13 | 中国南方电网有限责任公司 | Transforming plant integrated protection system based on IEC61850 |
| CN103022993A (en) * | 2012-11-23 | 2013-04-03 | 上海交通大学 | Adaptive cascade direction interlocking relaying method based on GOOSE (Generic Object Oriented Substation Event) |
| CN105375635A (en) * | 2015-12-02 | 2016-03-02 | 国家电网公司 | Method and system of intelligent management of power distribution network cascading switching stations |
| CN109980612A (en) * | 2019-02-27 | 2019-07-05 | 南京国电南自电网自动化有限公司 | A kind of method that line differential protection realizes weak feedback starting using zero-sequence fault component |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114629092A (en) * | 2022-04-11 | 2022-06-14 | 国网江苏省电力有限公司无锡供电分公司 | Method and system for realizing rapid action under wireless differential protection weak feedback condition |
| CN114629092B (en) * | 2022-04-11 | 2024-01-23 | 国网江苏省电力有限公司无锡供电分公司 | Method and system for realizing rapid action under wireless differential protection weak feed condition |
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