CN108318769B - Pressing plate state warning method and device for bus protection device of intelligent substation - Google Patents
Pressing plate state warning method and device for bus protection device of intelligent substation Download PDFInfo
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- CN108318769B CN108318769B CN201810341956.6A CN201810341956A CN108318769B CN 108318769 B CN108318769 B CN 108318769B CN 201810341956 A CN201810341956 A CN 201810341956A CN 108318769 B CN108318769 B CN 108318769B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
Abstract
The invention relates to a method and a device for alarming the state of a pressing plate of a bus protection device of an intelligent substation, wherein the method judges whether the state of the pressing plate is inconsistent from two aspects: on one hand, the angles of the information of the soft pressing plate, the position of the interval disconnecting link, the interval protection tripping soft pressing plate and the interval starting failure switching-in soft pressing plate are received at intervals; another aspect is based on the non-corresponding angles of the interval protection tripping soft pressing plate, the interval starting failure opening soft pressing plate and the interval receiving soft pressing plate. The protection device comprises an alarm module, a delay module, a message sending module, a first judgment module and a second judgment module, and is used for judging the state of the pressing plate in the two aspects and sending alarm information. The invention can intelligently detect that the pressing plate of the bus protection device is abnormally switched on or off, provide messages of inconsistent pressing plate states and prompt operation and maintenance personnel to maintain in time.
Description
Technical Field
The invention relates to the technical field of power operation and maintenance, in particular to a method and a device for intelligently detecting and warning the state of a pressing plate of a bus protection device of an intelligent substation, and belongs to the technical field of power system relay protection.
Background
The intelligent substation is used as a key link for the construction of a national intelligent power grid, and is rapidly developed in the aspects of new technology application, relevant standard formulation execution, construction scale and the like in recent years. With the implementation of the 'four unification' standard of the measurement and control device and the 'nine unification' standard of the protection device, the differentiation of the measurement and control of each manufacturer and the model files of the protection device is eliminated, and a foundation is provided for realizing intelligent detection and alarm logic of the state of the pressing plate of the bus protection device of the intelligent substation.
At present, a protection device focuses on research on a protection principle and a protection communication technology, few researches on operation and maintenance of the protection device are available, and a method for intelligently detecting alarm logic of a pressing plate state of a bus protection device of an intelligent substation is provided aiming at pressing plate management of the bus protection device and aiming at the phenomena that the protection device is refused to operate and is operated mistakenly due to pressing plate misoperation of an electric power system in recent years, so that the operation and maintenance intelligentization level of the intelligent substation is improved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: at present, a protection device focuses on research on a protection principle and a protection communication technology, few researches on operation and maintenance of the protection device exist, and the pressing plate state warning method and device for the bus protection device of the intelligent substation are provided to solve the technical problems that the phenomenon of the protection device refusing to operate and misoperation caused by pressing plate misoperation of an electric power system frequently occurs in recent years.
The technical scheme adopted by the invention for solving the technical problems is as follows:
firstly, the invention provides a method for alarming the state of a pressing plate of a bus protection device of an intelligent substation,
outputting a pressing plate inconsistency alarm input signal through a pressing plate inconsistency alarm soft pressing plate;
outputting interval receiving signals through the interval receiving soft pressing plate;
acquiring a position signal of the I main knife switch through the I main knife switch position pressing plate;
acquiring a position signal of the II main knife switch through the II main knife switch position pressing plate;
outputting a protection tripping signal through a protection tripping soft pressing plate;
outputting a startup failure opening signal through a startup failure opening soft pressure plate;
when the main bus connection is in a double-bus, double-bus single-section and double-bus double-section operation mode,
and alarming if the following conditions are met:
the output value of the soft pressing plate is 1, and one of the conditions a and b and one of the conditions c and d are met:
a. the output value of the interval receiving soft pressing plate is 1, and the output values of the I female knife switch position pressing plate and the II female knife switch position pressing plate are both 0;
b. the output value of the interval receiving soft pressing plate is 0, and the output value of at least one of the I female knife switch position pressing plate and the II female knife switch position pressing plate is 0;
c. the output value of the interval receiving soft pressing plate is 1, and at least one of the protection tripping soft pressing plate and the starting failure opening soft pressing plate has an output value of 0;
d. the output value of the interval receiving soft pressing plate is 0, and the output values of the protection tripping soft pressing plate and the starting failure opening soft pressing plate are both 1;
when the bus main connection is in a single bus, single bus section, single bus three-section and 3/2 breaker operation mode;
and alarming if the following conditions are met:
the output value of the pressing plate inconsistent alarm input soft pressing plate is 1, and one of the conditions of e and f is satisfied:
e. the output value of the interval receiving soft pressing plate is 1, and at least one of the protection tripping soft pressing plate and the starting failure opening soft pressing plate has an output value of 0;
f. the output value of the interval receiving soft pressing plate is 0, and the output values of the protection tripping soft pressing plate and the starting failure opening soft pressing plate are both 1.
The invention also provides a pressing plate state warning device of the intelligent substation bus protection device, which comprises:
the pressing plate inconsistency alarm input soft pressing plate is used for outputting pressing plate inconsistency alarm input signals;
an interval receiving soft pressing plate for outputting interval receiving signals;
the I female knife switch position pressing plate is used for acquiring an I female knife switch position pressing plate signal;
the II main knife switch position pressing plate is used for acquiring a II main knife switch position pressing plate signal;
the protection tripping soft pressing plate is used for monitoring a protection tripping signal;
the startup failure open-in soft pressing plate is used for outputting a startup failure open-in signal;
the device also comprises a first judgment module and a second judgment module;
the first judgment module is used for performing OR operation on the output value of the I female knife switch position pressing plate and the output value of the II female knife switch position pressing plate, performing XOR operation on the output value of the interval receiving soft pressing plate and the output value of the interval receiving soft pressing plate, performing AND operation on the output value of the interval receiving soft pressing plate and the output value of the interval receiving soft pressing plate which is inconsistent with the pressing plate, and outputting the output value;
the second judgment module is used for performing OR operation on the output value of the protection tripping soft pressure plate and the start-up failure opening soft pressure plate, performing XOR operation on the output value of the interval receiving soft pressure plate and the output value of the interval receiving soft pressure plate, performing AND operation on the output value of the interval receiving soft pressure plate and the output value of the interval receiving soft pressure plate, and outputting the output value;
the device also comprises an alarm module which is used for alarming,
when the bus main connection is in a double-bus, double-bus single-section and double-bus double-section operation mode, the alarm device gives an alarm when at least one output value in the first judgment module and the second judgment module is 1;
when the bus main connection is in a single bus, single bus section, single bus three-section and 3/2 breaker operation mode, the alarm device gives an alarm when at least one output value in the second judgment module is 1.
The system further comprises a delay module and a message sending module, wherein the delay module is used for sending information to the message sending module or feeding back information to the message sending module for a period of time, and the message sending module is used for sending alarm information.
Further, the time delay of sending the information to the message sending module is 1000 ms.
Further, the message sending module delays the feedback information by 300 ms.
The invention has the beneficial effects that: the bus protection device pressing plate switching device can intelligently detect that abnormity occurs when the pressing plate is switched on or off, provide inconsistent messages of pressing plate states and prompt operation and maintenance personnel to maintain in time.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a logic diagram for judging inconsistency of pressing plates of a bus protection device of an intelligent transformer substation with double buses, double bus single sections and double bus double sections in the embodiment of the invention;
FIG. 2 is a logic diagram for judging inconsistency of pressing plates of a bus protection device of an intelligent substation with a single bus, a single bus section, a single bus three-section and a 3/2 breaker main connection in the embodiment of the invention;
fig. 3 is a schematic composition diagram of an alarm module in the transformer protection device according to the embodiment of the present invention.
The reference numbers in the figures are:
201-interval receiving soft pressing plates, 202-I mother knife switch position pressing plates, 203-I mother knife switch position pressing plates, 204-pressing plate inconsistency warning input soft pressing plates, 205-protection tripping soft pressing plates, 206-starting failure opening soft pressing plates, 207-first OR gates, 208-first AND gates, 209-first XOR gates, 210-second XOR gates, 211-second AND gates, 212-second AND gates, 213-second OR gates, 3-warning modules, 301-time delay modules, 302-message sending modules, 303-first judgment modules and 304-second judgment modules.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
Fig. 1 is a logic diagram for judging inconsistency of pressing plates of a bus protection device of an intelligent transformer substation with double buses, double bus single sections and double bus double sections in the embodiment of the invention;
the method can be divided into two types according to whether a bus protection device receives separation disconnecting link position information for distinguishing, wherein the first type is a double-bus type, a double-bus single-section type and a double-bus double-section type main wiring bus protection device needs to receive separation bus disconnecting link information to determine a small difference flow calculation mode, and the other type is a single-bus type, a single-bus three-section type and an 3/2 breaker main wiring bus protection device does not need to receive separation bus disconnecting link information because a separation branch is fixedly connected with a bus, and the small difference flow calculation does not need to acquire the state of the separation bus disconnecting link information. For the above reasons, the present embodiment separately states the judgment logic for the inconsistency of the pressing plate state of the bus protection device in two categories.
Receiving a soft pressing plate at intervals: the method comprises the steps that whether a bus protection receives a pressure plate with a switching property of an analog quantity Sampling (SV) sent by a merging unit of an interval (line interval, main transformer interval and bus-coupler interval) or not is indicated, if the pressure plate corresponding to the interval is put into use, the bus protection receives the SV of the interval and participates in bus protection calculation, and although the bus protection can be received, SV data of the interval does not participate in bus protection calculation;
starting a failure opening soft pressing plate: the pressing plate is used for judging whether the bus protection receives a start failure GOOSE signal from the interval protection or not, if the pressing plate is put into the bus protection, the pressing plate can receive the start failure GOOSE signal sent from the interval protection, and the bus protection is not received and processed although the interval protection always sends the signal;
example 1
The embodiment provides a method for warning the pressing plate state of a bus protection device of an intelligent substation, which comprises the following steps:
as shown in fig. 1, the bus protection device of the intelligent substation with double buses, double bus single sections and double bus double section main wiring receives information and has interval bus disconnecting link position information, the bus protection soft pressing plate has interval receiving soft pressing plates, interval protection tripping soft pressing plates and interval starting failure opening soft pressing plates, wherein the interval receiving soft pressing plates refer to the SV receiving soft pressing plates of the interval branch, and the bus protection device pressing plate inconsistency judging method of the operation mode is as follows:
condition 1: and judging the situation that the position of the interval disconnecting link and the interval receiving soft pressing plate are not corresponding. There are two different cases: firstly, closing any disconnecting link at intervals, and withdrawing the receiving soft pressing plate at the intervals; and secondly, two disconnecting links are separated at intervals, and the soft pressing plate is received at the intervals.
Condition 2: and judging the condition that the interval protection tripping and starting failure opening soft pressing plate and the interval receiving soft pressing plate do not correspond. There are two different cases: the XX interval protection tripping and starting failure opening soft pressing plate are all put into operation, and the interval receiving soft pressing plate is withdrawn; and the XX interval protects tripping and starting failure opening soft pressing plate, and any one of the soft pressing plates is withdrawn (or both are withdrawn), and the interval receives the input of the soft pressing plate.
The condition 1 and the condition 2 are both controlled by a 'pressing plate inconsistent alarm input soft pressing plate', when the pressing plate inconsistent alarm input soft pressing plate is input, the judgment of the condition 1 and the condition 2 is only in effect, when the pressing plate inconsistent alarm input soft pressing plate exits, the judgment of the condition 1 and the condition 2 is ineffective, namely, when any one of the condition 1 or the condition 2 is met, the alarm device delays for 1s to send out alarm information, and simultaneously drives an 'abnormal operation', and an abnormal lamp is lighted, and the alarm device is uploaded to a background.
Specifically, with reference to the alarm logic diagram 1, when the soft pressing plate 201 is received at intervals and the pressing plate 202 at the I-mother knife switch position and the pressing plate 203 at the II-mother knife switch position both exit, the output value of the first or gate 207 is 0, the output value of the first xor gate 209 is 1, when the output value of the pressing plate inconsistency alarm input soft pressing plate 204 is 1, the output value of the second and gate 211 is 1, and the output value of the second or gate 213 is also 1, at this time, the alarm device protects the time delay 1s to report "pressing plate inconsistency alarm", and at the same time drives "operation exception", and the protection device points an exception lamp to be sent to the background; when the interval receiving soft pressing plate 201 exits, when at least one of the I mother knife switch position pressing plate 202 and the II mother knife switch position pressing plate 203 is thrown in, the output value of the first OR gate 207 is 1, the output value of the first XOR gate 207 is 1, when the pressing plate inconsistency alarm throw-in soft pressing plate 204 is 1, the output value of the second AND gate 211 is 1, and simultaneously the output value of the second OR gate 213 is also 1, at this moment, the alarm device protects the delay 1s and reports the pressing plate inconsistency alarm, and drives the operation abnormity, and the protection device points an abnormal lamp to be sent to the background.
FIG. 2 is a logic diagram for judging inconsistency of pressing plates of a bus protection device of an intelligent substation with a single bus, a single bus section, a single bus three-section and a 3/2 breaker main connection in the embodiment of the invention;
another embodiment of the present invention is as follows: as shown in fig. 2, the bus protection device of the intelligent substation of the single bus, the single bus section, the single bus three sections, and the 3/2 breaker main connection does not need to receive information and has the position information of the isolated bus disconnecting link, the bus protection soft pressing plate has isolated receiving soft pressing plates, isolated tripping soft pressing plates, and isolated starting failure opening soft pressing plates, wherein the isolated receiving soft pressing plates refer to SV receiving soft pressing plates of isolated branches, and the inconsistent judging logic of the bus protection device pressing plates of the operation mode is as follows:
and judging the condition that the interval protection tripping and starting failure opening soft pressing plate and the interval receiving soft pressing plate do not correspond. There are two cases that do not correspond to the case: firstly, the interval protection tripping and starting failure opening soft pressing plate are all put into operation, and the interval receiving soft pressing plate is withdrawn; and secondly, the interval protection tripping and starting failure opening soft pressing plate is withdrawn (or withdrawn) at any one, and the interval receives the input of the soft pressing plate.
The judgment condition is controlled by a pressing plate inconsistency alarm switching soft pressing plate, namely when the condition is satisfied, the alarm device delays for 1s to report the pressing plate inconsistency alarm, and simultaneously drives an abnormal operation lamp to switch on the abnormal lamp and send the abnormal lamp to the background.
Specifically, with reference to the alarm logic diagram 2, when the soft pressing plate 201 is switched in at an interval, the protection trip soft pressing plate 205 and the start-up malfunction start-up soft pressing plate 206 both exit, the output value of the first and gate 208 is 0, the output value of the second xor gate 210 is 1, when the output value of the pressing plate inconsistency alarm input soft pressing plate 204 is 1, the output value of the third and gate 212 is 1, and at the same time, the alarm device protection time delay 1s reports "pressing plate inconsistency alarm", and drives "operation exception" at the same time, and the protection device points an exception lamp and sends the lamp to the background; when the interval receiving soft pressing plate 201 exits, the protection tripping soft pressing plate 205 and the start failure opening soft pressing plate 206 are both switched in, the output value of the first AND gate 208 is 1, the output value of the second XOR gate 210 is 1, when the output value of the pressing plate inconsistency alarm switching soft pressing plate 204 is 1, the output value of the third AND gate 212 is 1, and the output value of the third OR gate 212 is also 1, at the moment, the alarm device protection time delay 1s reports the pressing plate inconsistency alarm, and drives the operation abnormity, and the protection device points an abnormal lamp to be sent to the background.
Example 2
The utility model provides an intelligent substation generating line protection device clamp plate state alarm device, alarm device includes:
the pressing plate inconsistency alarm input soft pressing plate is used for outputting pressing plate inconsistency alarm input signals;
an interval receiving soft pressing plate for outputting interval receiving signals;
the I female knife switch position pressing plate is used for acquiring an I female knife switch position pressing plate signal;
the II main knife switch position pressing plate is used for acquiring a II main knife switch position pressing plate signal;
the protection tripping soft pressing plate is used for monitoring a protection tripping signal;
the startup failure open-in soft pressing plate is used for outputting a startup failure open-in signal;
the device also comprises a first judgment module and a second judgment module;
the first judgment module is used for performing OR operation on the output value of the I female knife switch position pressing plate and the output value of the II female knife switch position pressing plate, performing XOR operation on the output value of the interval receiving soft pressing plate and the output value of the interval receiving soft pressing plate, performing AND operation on the output value of the interval receiving soft pressing plate and the output value of the interval receiving soft pressing plate which is inconsistent with the pressing plate, and outputting the output value;
the second judgment module is used for performing OR operation on the output value of the protection tripping soft pressure plate and the start-up failure opening soft pressure plate, performing XOR operation on the output value of the interval receiving soft pressure plate and the output value of the interval receiving soft pressure plate, performing AND operation on the output value of the interval receiving soft pressure plate and the output value of the interval receiving soft pressure plate, and outputting the output value;
also comprises an alarm module, a delay module and a message sending module,
when the bus main connection is in a double-bus, double-bus single-section and double-bus double-section operation mode, the alarm device gives an alarm when at least one output value in the first judgment module and the second judgment module is 1;
when the bus main connection is in a single bus, single bus section, single bus three-section and 3/2 breaker operation mode, the alarm device gives an alarm when at least one output value in the second judgment module is 1.
The time delay module is used for sending information to the message sending module or feeding back information time delay to the message sending module for a period of time, and the message sending module is used for sending alarm information. And the time delay of sending the information to the message sending module is 1000 ms. And the message sending module delays the feedback information for 300 ms.
Fig. 3 is a schematic composition diagram of an alarm module in the transformer protection device according to the embodiment of the present invention.
The protection device further comprises an alarm module 3, wherein the alarm module 3 comprises a delay module 301, a message sending module 302, a first judging module 303 and a second judging module 304. The delay module 301 is designed to delay the signaling for 1s and the return for 0.3s, so as to avoid increasing the processing burden and errors of the anti-error logic of the monitoring system due to frequent signaling in the operation process.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (4)
1. A pressing plate state warning method for a bus protection device of an intelligent substation is characterized in that,
outputting a pressing plate inconsistency alarm input signal through a pressing plate inconsistency alarm input soft pressing plate;
outputting interval receiving signals through the interval receiving soft pressing plate;
acquiring a position signal of the I main knife switch through the I main knife switch position pressing plate;
acquiring a position signal of the II main knife switch through the II main knife switch position pressing plate;
outputting a protection tripping signal through a protection tripping soft pressing plate;
outputting a startup failure opening signal through a startup failure opening soft pressure plate;
when the bus main wiring is in a double-bus, double-bus single-section and double-bus double-section operation mode, the following conditions are met, a period of time is delayed, a pressing plate inconsistency warning is reported, and an operation abnormity is driven at the same time: the pressing plate inconsistency warning input soft pressing plate has an output value of 1, and one of a condition a and a condition b or one of a condition c and a condition d is met:
a. the output value of the interval receiving soft pressing plate is 1, and the output values of the I female knife switch position pressing plate and the II female knife switch position pressing plate are both 0;
b. the output value of the interval receiving soft pressing plate is 0, and the output value of at least one of the I female knife switch position pressing plate and the II female knife switch position pressing plate is 1;
c. the output value of the interval receiving soft pressing plate is 1, and at least one of the protection tripping soft pressing plate and the starting failure opening soft pressing plate has an output value of 0;
d. the output value of the interval receiving soft pressing plate is 0, and the output values of the protection tripping soft pressing plate and the starting failure opening soft pressing plate are both 1;
when the bus main connection is in a single bus, single bus section, single bus three-section and 3/2 breaker operation mode; and alarming if the following conditions are met: the output value of the pressing plate inconsistent alarm input soft pressing plate is 1, and one of the conditions of e and f is satisfied:
e. the output value of the interval receiving soft pressing plate is 1, and at least one of the protection tripping soft pressing plate and the starting failure opening soft pressing plate has an output value of 0;
f. the output value of the interval receiving soft pressing plate is 0, and the output values of the protection tripping soft pressing plate and the starting failure opening soft pressing plate are both 1.
2. The utility model provides an intelligent substation generating line protection device clamp plate state alarm device which characterized in that, alarm device includes:
the pressing plate inconsistency alarm input soft pressing plate is used for outputting pressing plate inconsistency alarm input signals;
an interval receiving soft pressing plate for outputting interval receiving signals;
the I female knife switch position pressing plate is used for acquiring an I female knife switch position pressing plate signal;
the II main knife switch position pressing plate is used for acquiring a II main knife switch position pressing plate signal;
the protection tripping soft pressing plate is used for monitoring a protection tripping signal;
the startup failure open-in soft pressing plate is used for outputting a startup failure open-in signal;
the device also comprises a first judgment module and a second judgment module;
the first judgment module is used for performing OR operation on the output value of the I female knife switch position pressing plate and the output value of the II female knife switch position pressing plate, performing XOR operation on the output value of the interval receiving soft pressing plate and the output value of the interval receiving soft pressing plate, performing AND operation on the output value of the interval receiving soft pressing plate and the output value of the interval receiving soft pressing plate which is inconsistent with the pressing plate, and outputting the output value;
the second judgment module is used for carrying out AND operation on the output value of the protection tripping soft pressing plate and the start-up failure opening soft pressing plate, carrying out XOR operation on the output value of the interval receiving soft pressing plate and the output value of the interval receiving soft pressing plate, carrying out AND operation on the output value of the interval receiving soft pressing plate and the output value of the interval receiving soft pressing plate which is inconsistent with the pressing plate and is input into the soft pressing plate, and outputting the output value;
the device also comprises an alarm module which is used for alarming,
when the bus main connection is in a double-bus, double-bus single-section and double-bus double-section operation mode, the alarm device gives an alarm when at least one output value in the first judgment module and the second judgment module is 1;
when the main bus connection is in a single bus, single bus section, single bus three-section and 3/2 breaker operation mode, the alarm device gives an alarm when the output value of the second judgment module is 1;
the system also comprises a delay module and a message sending module, wherein the delay module is used for sending information to the message sending module or feeding back information to the message sending module for a period of time, and the message sending module is used for sending alarm information.
3. The alerting device of claim 2 wherein the time delay for transmitting the message to the messaging module is 1000 ms.
4. The warning device of claim 2 wherein the message sending module delays the message sending module by 300 ms.
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| CN101629983B (en) * | 2009-08-12 | 2011-07-27 | 国电南京自动化股份有限公司 | Judging method of double-bus bus-coupled running mode |
| CN201514491U (en) * | 2009-09-28 | 2010-06-23 | 泉州科力电气有限公司 | Transformer substation protection pressure plate status monitoring system |
| CN103441431B (en) * | 2013-08-20 | 2015-09-23 | 国家电网公司 | A kind of distribution box becomes temporary earthing device and earthing method |
| CN104852469B (en) * | 2015-05-07 | 2016-12-28 | 国家电网公司 | Intelligent substation based on the equipment real-time status long-range method for preventing misoperation of soft pressing plate |
| KR101663532B1 (en) * | 2015-12-02 | 2016-10-10 | 세종전기공업 주식회사 | The heat prediction system of the distributing board with BUS-bar printed electronic pattern |
| CN106340818B (en) * | 2016-10-17 | 2018-03-27 | 南京国电南自电网自动化有限公司 | Intelligent substation relay protection device maintenance peace arranges assistant analysis method for early warning |
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