CN117154931A - Communication method of relay protection device with gateway function and relay protection device - Google Patents

Communication method of relay protection device with gateway function and relay protection device Download PDF

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Publication number
CN117154931A
CN117154931A CN202311092762.4A CN202311092762A CN117154931A CN 117154931 A CN117154931 A CN 117154931A CN 202311092762 A CN202311092762 A CN 202311092762A CN 117154931 A CN117154931 A CN 117154931A
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CN
China
Prior art keywords
control
downstream
data
relay protection
protection device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311092762.4A
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Chinese (zh)
Inventor
邓素碧
拜尔·延斯
郭觐宁
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Siemens Power Automation Ltd
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Siemens Power Automation Ltd
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Publication date
Application filed by Siemens Power Automation Ltd filed Critical Siemens Power Automation Ltd
Priority to CN202311092762.4A priority Critical patent/CN117154931A/en
Publication of CN117154931A publication Critical patent/CN117154931A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00028—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment involving the use of Internet protocols
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H02J13/00034—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving an electric power substation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
    • H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Human Computer Interaction (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Selective Calling Equipment (AREA)

Abstract

The invention provides a communication method of a relay protection device with a gateway function and the relay protection device, wherein the communication method comprises the following steps: receiving a control command sent by an upstream SCADA system, wherein the control command comprises identification information and control data of a control object; determining a downstream control device corresponding to the control object according to the identification information of the control object, wherein the downstream control device is used for controlling the control object according to the control data; transmitting a control command to the downstream control equipment, wherein the control command is information which can be identified by the downstream control equipment and is generated according to the control command; receiving control feedback information sent by downstream control equipment according to a control instruction, wherein the control feedback information is used for indicating whether the downstream control equipment successfully executes the control instruction; and sending an execution result to the upstream SCADA system, wherein the execution result is information which can be identified by the SCADA system and is generated according to the control feedback information.

Description

Communication method of relay protection device with gateway function and relay protection device
Technical Field
The invention relates to the field of power automation systems, in particular to a communication method of a relay protection device with a gateway function and the relay protection device.
Background
Digital substation SCADA (Supervisory Control And Data Acquisition) systems typically support modern protocols, such as the IEC61850 protocol. However, many field devices, such as temperature sensors, humidity sensors, pressure sensors, position sensors, power collection devices, and switching value input/output devices, only support conventional protocols such as Modbus, and the data of these field devices cannot be used by the SCADA system of the digital substation.
To solve this problem, an additional gateway is provided in the prior art to act as a protocol conversion between the digital substation SCADA and the field devices. But this increases the cost and complexity of the system.
Disclosure of Invention
In view of this, the present invention provides a communication method of a relay protection device with gateway function, including:
receiving a control command sent by an upstream SCADA system, wherein the control command comprises identification information and control data of a control object;
determining a downstream control device corresponding to the control object according to the identification information of the control object, wherein the downstream control device is used for controlling the control object according to the control data;
Transmitting a control instruction to the downstream control equipment, wherein the control instruction is information which is generated according to the control instruction and can be identified by the downstream control equipment;
receiving control feedback information sent by the downstream control equipment according to the control instruction, wherein the control feedback information is used for indicating whether the downstream control equipment successfully executes the control instruction;
and sending an execution result to the upstream SCADA system, wherein the execution result is information which can be identified by the SCADA system and is generated according to the control feedback information.
According to the communication method as described above, alternatively,
after receiving a control command sent by an upstream SCADA system and before determining a downstream control device corresponding to the control object according to the identification information of the control object, the method further comprises: storing the control command to a preset data center;
after storing the control command in a preset data center and before sending a control command to the downstream control device, the method further comprises: receiving the control command sent by the data center;
and generating a control instruction which can be identified by the downstream control equipment according to the control command.
According to the communication method as described above, alternatively,
after receiving a control feedback message sent by the downstream control device according to the control instruction and before sending an execution result to the upstream SCADA system, the method further includes: storing the control feedback information to the data center;
after storing the control feedback information to the data center and before sending an execution result to the upstream SCADA system, further comprising:
receiving the control feedback information sent by the data center;
and generating the execution result which can be identified by the upstream SCADA system according to the control feedback information.
According to the communication method as described above, alternatively,
after determining the downstream control equipment corresponding to the control object according to the identification information of the control object and before sending the control instruction to the downstream control equipment, the method further comprises the following steps:
determining whether the control instruction can be sent to the downstream control equipment according to the identification information of the downstream control equipment;
and if the result of the determination is yes, executing the operation of sending the control instruction to the downstream control equipment.
According to the communication method as described above, alternatively,
further comprises:
receiving data of an acquisition object sent by downstream acquisition equipment;
and identifying whether the data of the acquisition object changes, and if so, actively transmitting the current data of the acquisition object to a preset data center.
According to the communication method as described above, alternatively,
before identifying whether the data of the acquisition object changes, the method further comprises:
judging whether the acquisition object of the downstream acquisition equipment is one of subscribed objects of the data center;
and if so, executing the operation of identifying whether the data of the acquisition object changes.
According to the communication method as described above, alternatively,
after identifying whether the data of the acquisition object changes, the method further comprises:
judging whether the acquisition object is one of subscribed objects of the upstream SCADA system;
and if the judgment result is yes, actively transmitting the data of the acquisition object of the downstream acquisition equipment to the upstream SCADA system.
According to the communication method as described above, optionally, quality information of the data of the acquisition object corresponding to one downstream acquisition device is transmitted to the upstream SCADA system, where the quality information is used to indicate whether the data of the acquisition object is correct.
Optionally, the data center is an IEC 168450 data center according to the communication method described above.
The invention also provides a relay protection device with gateway function, comprising:
a first receiving unit, configured to receive a control command sent by an upstream SCADA system, where the control command includes identification information and control data of a control object;
a first determining unit, configured to determine a downstream control device corresponding to the control object according to the identification information of the control object, where the downstream control device is configured to control the control object according to the control data;
a first sending unit, configured to send a control instruction to the downstream control device, where the control instruction is information that is generated according to the control instruction and can be identified by the downstream control device;
a second receiving unit, configured to receive a control feedback message sent by the downstream control device according to the control instruction, where the control feedback message is used to indicate whether the downstream control device successfully executes the control instruction;
and a second sending unit, configured to send an execution result to the upstream SCADA system, where the execution result is information that can be identified by the SCADA system and is generated according to the control feedback information.
According to the relay protection device described above, optionally, the relay protection device further includes:
a first storage unit for storing the control command to a preset data center;
and the first generation unit is used for receiving the control command sent by the data center and generating a control command which can be identified by the downstream control equipment according to the control command.
According to the relay protection device described above, optionally, the relay protection device further includes:
a second storage unit for storing the control feedback information to the data center;
and the second generation unit is used for receiving the control feedback information sent by the data center and generating the execution result which can be identified by the upstream SCADA system according to the control feedback information.
According to the relay protection device described above, optionally, the relay protection device further includes:
and the second determining unit is used for determining whether the control instruction can be sent to the downstream control equipment according to the identification information of the downstream control equipment, and triggering the second sending unit if the determination result is yes.
According to the relay protection device, optionally, the second receiving unit is further configured to receive data of an acquisition object sent by a downstream acquisition device;
The relay protection device further comprises:
and the identification unit is used for identifying whether the data of the acquisition object changes or not, and if the identification result is yes, the identification unit actively transmits the current data of the acquisition object to a preset data center.
According to the relay protection device described above, optionally, the relay protection device further includes:
a first judging unit, configured to judge whether an acquisition object of the downstream acquisition device is one of subscribed objects of the data center, and if yes, trigger the identifying unit; or (b)
And a second judging unit, configured to judge whether the acquisition object is one of subscribed objects of the upstream SCADA system, and if the judgment result is yes, actively send the data of the acquisition object of the downstream acquisition device to the upstream SCADA system.
According to the relay protection device as described above, optionally, the second sending unit is further configured to send, to the upstream SCADA system, quality information of data of an acquisition object corresponding to a downstream acquisition device, where the quality information is used to indicate whether the data of the acquisition object is correct.
The invention also provides a relay protection device with gateway function, comprising:
At least one memory for storing instructions;
at least one processor for executing the communication method of the relay protection device with gateway function according to any one of the above according to the instructions stored in the memory.
The present invention still further provides a readable storage medium having stored therein machine-readable instructions which, when executed by a machine, perform a method of communication of a gateway-enabled relay protection device according to any of the above.
According to the scheme, the gateway function is integrated in the relay protection device, the relay protection device can communicate with the downstream control equipment, so that communication between the upstream SCADA system and the downstream control equipment is realized, no additional component is arranged, and the complexity of the system is not increased. In addition, after the downstream control equipment feeds back the control feedback information of the downstream control equipment, the relay protection device can generate an execution result according to the control feedback information, and further feeds back the result of the control command executed by the downstream equipment to the upstream SCADA system, so that whether the control command is successfully executed or not can be accurately fed back.
Drawings
The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail preferred embodiments thereof with reference to the attached drawings in which:
fig. 1 is a flow chart of a communication method of a relay protection device with gateway function according to an embodiment of the invention.
Fig. 2 is a flow chart of a communication method of a relay protection device with gateway function according to another embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a communication system of a relay protection device with gateway function according to an embodiment of the present invention.
Fig. 4 is a flowchart of a communication method of a relay protection device with gateway function according to still another embodiment of the present invention.
Fig. 5A is a schematic structural diagram of a relay protection device with gateway function according to an embodiment of the present invention.
Fig. 5B is a schematic structural diagram of a relay protection device with gateway function according to another embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a relay protection device with gateway function according to another embodiment of the present invention.
Fig. 7 is a schematic structural diagram of a relay protection device with gateway function according to another embodiment of the present invention.
Detailed Description
The present invention will be further described in detail with reference to the following examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. Nouns and pronouns for humans in this patent application are not limited to a particular gender.
Example 1
The embodiment provides a communication method of a relay protection device with a gateway function, an execution main body of the communication method is the relay protection device, the relay protection device can be located in a switch cabinet or can be independently arranged, and the relay protection device can execute the same operation as a gateway except for a protection function.
Fig. 1 is a schematic flow chart of a communication method of a relay protection device with gateway function according to the present embodiment. The communication method of the relay protection device with the gateway function comprises the following steps:
step 100, receiving a control command sent by an upstream SCADA system.
The control command here includes identification information and control data of a control object that can be controlled by a downstream control device based on the control data. The control object is, for example, the temperature of the gas tank, the temperature of the generator, the position of the circuit breaker, etc., and the control data here is, for example, how much the temperature reaches, the circuit breaker is closed or opened, etc. The downstream control device controls the control object, such as how much the temperature of the air box is to be adjusted, etc., in accordance with the control data.
The SCADA (Supervisory Control and Data Acquisition) system herein is a data acquisition and monitoring control system. The SCADA system can send a control command for a control object from a remote end, for example, send a control command for adjusting the temperature of the air tank to a preset temperature, or a control command for adjusting the pressure of the air tank to a preset pressure, which can be specifically set according to actual needs and will not be described herein.
The identification information may be an address of the control object, or may be a specific identification of the control object, which may be specifically set according to actual needs, and will not be described herein.
Step 101, determining a downstream control device corresponding to the control object according to the identification information of the control object, where the downstream control device is used to control the control object according to the control data.
The downstream control device may be at least one of the following: temperature regulator, humidity regulator, pressure regulator. Of course, the downstream control device also includes other regulators or controllers, which are not described in detail herein.
The relay protection device may store a correspondence between the control object and the downstream control device, for example, in a mapping table, and after receiving the control command, the relay protection device may find the corresponding downstream control device according to the identification information of the control object included in the control command.
It should be noted that, in the case that the corresponding downstream control device cannot be found according to the identification information of the control object, it is indicated that the control command has an error, and the subsequent operation may be terminated, and corresponding information, such as "failure", may be fed back to the SCADA system.
Step 102, a control instruction is sent to the downstream control device, where the control instruction is information that can be identified by the downstream control device generated according to the control command.
The relay protection device with the gateway function generates a control command which can be identified by downstream control equipment from the control command, so that the downstream control equipment can execute corresponding operation according to the control command.
Step 103, receiving a piece of control feedback information sent by the downstream control device according to the control instruction, where the control feedback information is used to indicate whether the downstream control device successfully executes the control instruction.
After receiving the control instruction, the downstream control device determines whether the corresponding operation can be executed according to the control instruction, and generates control feedback information. For example, if the downstream control device determines that the corresponding operation can be performed, a pulse is sent to the controlled object, which may be regarded as successful execution of the control command. Then, the downstream control device sends the control feedback information to the relay protection device to indicate successful execution of the control instruction. If the downstream control device determines that the corresponding operation cannot be performed, a failure is returned as control feedback information, and error information can be attached to the control feedback information.
And step 104, sending an execution result to the upstream SCADA system, wherein the execution result is generated according to the control feedback information.
The relay protection device sends an execution result to the upstream SCADA system, so that the upstream SCADA system knows whether the sent control command is successfully executed or not, and further can perform subsequent operations, such as alarming and the like, according to the execution result. As an exemplary illustration, the execution result is feedback information that the upstream SCADA system can recognize, for example, may be part of the control feedback information, and may be recompiled, i.e., the relay protection device with gateway function can effectively and simply communicate with the upstream SCADA system, and also effectively communicate with the downstream control device.
As an exemplary illustration, after step 101 and before step 102, further comprises:
determining whether a control instruction can be sent to the downstream control equipment according to the identification information of the downstream control equipment;
and if the result of the determination is yes, executing an operation of sending a control instruction to the downstream control equipment.
For example, if the relay protection device identifies that the downstream control device is not online or unable to communicate or that the downstream control device is not in the management list of the relay protection device, determining that the downstream control device is unable to send control instructions; if the relay protection device identifies that the downstream control equipment is online, the control instruction can be sent to the downstream control equipment.
According to the invention, the gateway function is integrated in the relay protection device, and the relay protection device can communicate with the downstream control equipment, so that the communication between the upstream SCADA system and the downstream control equipment is realized, no additional component is arranged, and the complexity of the system is not increased. In addition, after the downstream control equipment feeds back the control feedback information of the downstream control equipment, the relay protection device can generate an execution result according to the control feedback information, and further feeds back the result of the control command executed by the downstream equipment to the upstream SCADA system, so that whether the control command is successfully executed or not can be accurately fed back.
Example two
The communication method of the relay protection device with gateway function in the first embodiment is further described in a supplementary manner.
Fig. 2 is a schematic flow chart of a communication method of the relay protection device with gateway function according to the present embodiment. The communication method of the relay protection device with the gateway function comprises the following steps:
step 201, receiving information of an acquisition object sent by a downstream acquisition device.
For example, the downstream collecting device is a temperature and pressure sensor, and the collecting object may be the temperature of a certain component, or may be the pressure of a certain component, or may include both the temperature and the pressure of a certain component, which may be specifically set according to actual needs. The receiving may be that the downstream collecting device periodically sends the data to the relay protection device, or that the data of the downstream collecting device is automatically sent to the relay protection device after being changed, or that the relay protection device periodically polls the downstream collecting device to obtain the data, according to different protocols.
It should be noted that if the downstream acquisition device has a control function at the same time, that is, has the function of the downstream control device of the foregoing embodiment, it may be regarded as the downstream acquisition device or may be regarded as the foregoing downstream control device.
Step 202, identifying whether the data of the acquisition object changes, and if so, sending the current data of the acquisition object to a preset data center.
The relay protection device can compare whether the difference exists between the current data of the acquisition object and the data of the last acquisition object stored previously, if so, the data of the acquisition object is sent to the data center to be stored in the preset data center, and if not, the current data can be reserved and not sent to the data center.
The data center may store a correspondence between identification information of the collection object and data.
As an illustration, a plurality of circuit boards exist in the relay protection device, and the circuit boards can communicate with one another. The data center may be provided on a specific circuit board, so that the circuit board receiving the information of the acquisition object sent by the downstream acquisition device can compare the information with locally stored information, and if a change is identified, the information is sent to the data center and stored. The locally stored information may be updated information with changes for each received acquisition object. Accordingly, changes in information in the data center may also be notified to the circuit board in communication with the downstream acquisition device, i.e., the circuit board in communication with the downstream acquisition device may also subscribe to objects in the data center.
Furthermore, between step 201 and step 202, it may further include:
judging whether the acquisition object is one of subscribed objects of the data center or not;
and if the judgment result is yes, executing the operation of identifying whether the data of the acquisition object changes.
For the relay protection device, the data center may subscribe to the downstream collection device or the collection object of the downstream collection device, if the data center has subscribed to the downstream collection device, the data center may be regarded as subscribing to the collection object of the downstream collection device, or has subscribed to some collection object of the downstream collection device, for example, subscribed to a pressure temperature sensor, where the collection object is the pressure and the temperature of the pressure temperature sensor, and if the pressure temperature sensor collects the pressure and the temperature of the air box, the pressure and the temperature of the air box are also equivalent to those subscribed to the pressure and the temperature of the air box. Any change in the data of the collection object of the downstream collection device triggers an update of the data in the data center; or a device's temperature is subscribed to, the acquisition object is the device's temperature, and a change in the data of those acquisition objects of the downstream acquisition device triggers an update of the data in the data center. The data of the subscribed object of the data center can be stored in the circuit board for receiving the data of the acquired object sent by the downstream acquisition equipment, so that the data can be directly compared with the information on the circuit board, and the execution speed is high.
The data center here may be an IEC61850 data center. The collection object may be pressure, temperature, humidity, etc., which will not be described in detail.
Optionally, after step 202, the method further includes:
step 203, determining whether the collection object of the downstream collection device is one of the objects subscribed to by the upstream SCADA system, and if yes, triggering step 204.
The SCADA system can subscribe to some objects in the data center, so that the change of the data of the objects in the data center triggers the update of the data in the SCADA system, and the relay protection device can actively report the change of the data of the objects in the data center to the SCADA system so as to ensure real-time performance, and can reduce the communication information quantity of the SCADA system and the delivery and processing workload of the SCADA system.
Step 204, sending data of the acquisition object of the downstream acquisition device to the upstream SCADA system.
After the SCADA system receives the data of the acquisition object of the downstream acquisition device, subsequent operations can be executed according to the change of the data of the acquisition object of the downstream acquisition device, so that the SCADA system can timely give corresponding reactions, such as alarm or control command sending, to adjust according to the change of the data of the acquisition object of the downstream acquisition device.
It should be noted that, in fig. 2, only step 201 and step 202 may be present, only step 203 and step 204 may be present, or steps 201 to 204 may be present at the same time, and may be specifically determined according to actual needs, which is not described herein.
Further, the collection objects here are, for example, the temperature of the gas tank, the temperature of the generator, the position of the circuit breaker, and the like, each of which corresponds to identification information and data, and the data here is, for example, the degree of temperature, and the data center stores the correspondence between the identification information and the data of the collection object. The relay protection device can determine whether the data center subscribes to the information of the acquisition object according to the corresponding relation between the downstream acquisition equipment and the acquisition object. The following will be described with specific examples:
the downstream collection equipment in the switch cabinet comprises a pressure temperature sensor A, a pressure temperature sensor B and a position sensor C, wherein the sensors are respectively positioned at different positions in the switch cabinet, the controller D is used for controlling the temperature of a gas box in the switch cabinet, the pressure temperature sensor B is used for sensing the temperature and the pressure of the gas box, namely, the collection object of the pressure sensor temperature B is the temperature of the gas box and the pressure of the gas box, the pressure temperature sensor A is used for sensing the temperature and the pressure in a heat dissipation channel, namely, the collection object of the pressure temperature sensor A is the temperature in the heat dissipation channel and the pressure in the heat dissipation channel, and the position sensor C is used for monitoring the position of a moving contact of the circuit breaker, namely, the collection object of the position sensor C is the position of the moving contact of the circuit breaker. For an IEC 168450 data center, it subscribes to the following objects: the IEC 168450 data center subscribes to the pressure temperature sensor A, the pressure of the air box and the position of the moving contact of the circuit breaker, and is equivalent to subscribing the temperature of the heat dissipation channel and the pressure of the heat dissipation channel. For SCADA systems, they subscribe to the temperature of the heat sink channel and the position of the moving contacts of the circuit breaker. The subscription manner here may be that the user manually configures.
And the relay protection device with the gateway function receives a control command sent by the upstream SCADA system, wherein the control command indicates that the temperature of an air box in the switch cabinet is adjusted to 30 ℃, and the temperature of the air box is the controlled object. After receiving the control command, the relay protection device recognizes that the temperature control of the air box in the control switch cabinet is the function of a temperature controller D, wherein the temperature controller D is downstream control equipment, and then generates a control command according to the control command and sends the control command to the temperature controller D. After receiving the control instruction, the temperature controller D detects that the temperature of the air box in the control switch cabinet is the function of the temperature controller D, sends out a pulse width for adjusting the temperature to 30 ℃, and sends control feedback information to the relay protection device, for example, informs that the operation for adjusting the temperature of the air box in the switch cabinet to 30 ℃ is successfully executed. After receiving the control feedback information, the relay protection device can generate an execution result for the control command, for example, "success", according to the upstream communication protocol, and feed back the execution result to the upstream SCADA system. In addition, after receiving the temperature feedback of the pressure temperature sensor B, the relay protection device compares the temperature feedback with the temperature of the locally stored pressure temperature sensor B, and finds that the temperature feedback changes, so that the temperature value of the locally stored pressure temperature sensor B is modified to 30 ℃. Since the data center is not subscribed to the temperature of the gas box, the information of the temperature does not need to be updated in the data center.
Then, the pressure temperature sensor A sends the monitored temperature of the heat dissipation channel to the relay protection device, the relay protection device compares the monitored temperature with the stored temperature, the change is found, the data center is identified to subscribe to the pressure temperature sensor A, the temperature of the heat dissipation channel corresponding to the temperature sensor A is equivalent to the temperature of the heat dissipation channel, and the latest temperature can be sent to the data center. Then, the relay protection device identifies that the upstream SCADA system subscribes to the temperature of the heat dissipation channel according to the preset information of the data center, and the relay protection device actively sends the temperature of the heat dissipation channel updated by the data center to the SCADA system so that the SCADA system executes subsequent operations, such as sending out an over-temperature alarm and the like.
Optionally, the communication method of the present embodiment further includes: and sending quality information of the data of the acquisition object corresponding to the downstream acquisition equipment to the upstream SCADA system, wherein the quality information is used for indicating whether the data of the acquisition object is correct or not. The quality information can be obtained by self analysis of the relay protection device or by analysis of downstream acquisition equipment. As an exemplary illustration, for example, the relay protection device should periodically acquire the data of the acquisition object, but since the circuit board in the relay protection device that communicates with the downstream acquisition device fails, the data of the acquisition object cannot be acquired, and then the quality information of the acquisition object, such as "invalid" or "invalid", may be sent to the upstream SCADA system. After the upstream SCADA system receives the quality information of the collected object, a subsequent operation, such as whether to send an alarm to a staff member, can be determined according to the quality information. The quality information may also include a cause of an error, for example, a fault occurs in a circuit board in the relay protection device, which communicates with the downstream acquisition device, or the downstream acquisition device does not report the data of the acquisition object on time, which may be specifically set according to the actual requirement, and will not be described herein.
According to the embodiment, through subscribing the object in advance, the changed data of the object can be selectively sent to the device subscribing the object, so that timeliness can be ensured, information interaction can be reduced, and communication efficiency is improved.
Example III
The communication method of the relay protection device with gateway function in the foregoing embodiment is further described in this embodiment.
As shown in fig. 3, a schematic structural diagram of a communication system of the relay protection device 32 with gateway function according to the present embodiment is shown. The communication system comprises an upstream SCADA system 31, a relay protection device 32 with gateway function, a downstream acquisition device 33 and a downstream control device 34. The relay protection device 32 includes a server-side communication unit 321, a data center 322, and a client-side communication unit 323, where the server-side communication unit 321, the data center 322, and the client-side communication unit 323 may be located on different circuit boards. The server-side communication unit 321 is configured to communicate with the SCADA system 31, the client-side communication unit 323 is configured to communicate with the downstream collecting device 33 and the downstream control device 34, and the server-side communication unit 321 (server protocol) and the data center 322, and the data center 322 and the client-side communication unit 323 (client protocol) are all capable of communicating with each other, that is, the relay protection device 32 of this embodiment adds the client-side communication unit 323. The gateway function in the relay protection device 32 of this embodiment is implemented based on IEC61850, and the data center 322 stores an IEC61850 data center.
The client-side communication unit 323 receives the original data message sent by the downstream collecting device 33, the client-side communication unit parses the original data message and obtains the original data, the client-side communication unit 323 converts the original data into a data type and format supported by the data center, the client-side communication unit 323 stores the original data, and uses an ACSI (Abstract Communication Service Interface ) service to store the original data in the data center for the original measurement and protection functions of the relay protection device 32, such as performing measurement and protection function processing on the original data, to generate corresponding functional data, and the functional data may also be stored in the data center.
The server-side communication unit 321 performs information interaction with a data center by using an ACSI service, all the changed data are actively sent to the server-side communication unit 321 in the data center, the server-side communication unit 321 converts all the data into data types and formats supported by the server-side communication unit 321 for sending, the server-side communication unit 321 packages all the data to form corresponding protocol messages, and the protocol messages are sent to the SCADA system 31.
As another exemplary illustration, the server-side communication unit 321 receives a control command message sent by the SCADA system 31, and parses the control command message to obtain a control command. The server-side communication unit 321 converts the data type and format of the control command into a data type and format supported by the data center, and stores the control command in the data center 322 using the ACSI service, the data center 322 actively transmits the control command to the client-side communication unit 323 using the ACSI service, the client-side communication unit 323 converts the data type and format of the control command into a data type and format supported by the client-side communication unit 323, packages the control command to form a control instruction message, and the client-side communication unit 323 transmits the control instruction message to the downstream control device 34 and waits for receiving a control feedback message from the downstream control device 34. The client-side communication unit 323 parses the control feedback message, parses the control feedback information, performs type and format conversion on the control feedback information, converts the control feedback information into a type and format supported by the data center, and stores the control feedback information in the data center 322 through the ACSI service. The data center 322 actively transmits the acquired control feedback information to the server-side communication unit 321 by using the ACSI service, the server-side communication unit 321 converts the data and format of the control feedback information into the data type and format supported by the server-side communication unit 321, and then packages the data and format into an execution result message, and transmits the execution result message to the SCADA system 31, so that the SCADA system 31 can accurately and timely acquire the information.
In this embodiment, all interactions between the server-side communication unit 321 and the client-side communication unit 323 in the relay protection device with gateway function and the data center 322 are based on the format and type of data adopted by the data center, so that the new server-side communication unit 321 and client-side communication unit 323 can be conveniently expanded. The extended server-side communication unit 321 and client-side communication unit 323 are convenient because the interface of the data center 322 does not need to be changed even if a new communication protocol is adopted.
Example IV
The communication method of the relay protection device with gateway function in the first embodiment is further described in a supplementary manner.
Fig. 4 is a schematic flow chart of a communication method of the relay protection device with gateway function according to the present embodiment. The communication method comprises the following steps:
step 400, receiving a control command sent by an upstream SCADA system, wherein the control command comprises identification information and control data of a control object.
This step 400 corresponds to step 100 and is not described in detail herein.
Step 401, storing the control command in a preset data center.
Step 402, a control command sent by a data center is received.
Step 403, determining a downstream control device corresponding to the control object according to the identification information of the control object, where the downstream control device is configured to control the control object according to the control data.
This step 403 corresponds to step 101 and is not described here.
Step 404, generating a control command which can be identified by the downstream control device according to the control command.
Step 405, a control instruction is sent to a downstream control device.
Step 406, receiving a piece of control feedback information sent by the downstream control device after the downstream control device executes the control according to the control command, where the control feedback information is used to indicate whether the downstream control device successfully executes the control command.
Step 407, storing the control feedback information to the data center.
Step 408, receiving control feedback information sent by the data center.
And 409, generating an execution result which can be identified by the upstream SCADA system according to the control feedback information.
Step 410, send the execution result to the upstream SCADA system. Of course, steps 400, 409, 410 may exist alone, i.e. steps 403 to 406 may not be present; or steps 403 to 406 may be present alone, i.e. steps 400, 409, 410 may be absent; or all the steps shown in fig. 4 exist at the same time, and may be specifically selected according to actual needs, which is not described herein.
In this embodiment, after step 101 of the first embodiment and before step 102, the method further includes: and storing the control command into a preset data center. The data center may be an IEC 168450 data center. In this way, when the control command is received and the control command is sent as different components, the control command can be accurately obtained, and the control command stored in the data center can be used by other functions of the relay protection device, such as monitoring the execution state of the control command, receiving the control command, executing, receiving the feedback command, and the like. In addition, in order to save the storage space of the data protection center, the data identifiers stored in the data center can be converted into digital strings. When a new control command is stored in the data center, the new control command can be actively sent to a component which needs to send the control command corresponding to the control command, and the control command can be one of objects subscribed in advance. In addition, after receiving the control feedback information, the control feedback information may also be stored to the control center. In this way, the data center can actively send the control feedback information to the component which needs to send the execution result corresponding to the control feedback information, and the control feedback information can also be used by other functions of the relay protection device, and the component for sending the execution result generates the execution result which can be identified by the SCADA system after receiving the control feedback information and sends the execution result to the SCADA system. The related control command and the execution result are stored through one data center, so that unified storage and unified management can be realized, and data cannot be lost.
This may be accomplished by a conversion of the format and type of the message when communicating with the corresponding device. For example, if the data center is an IEC 168450 data center, when the control command is stored in the data center, a data format that can be recognized by the data center may be used.
According to the embodiment, the communication between the upstream SCADA system and the downstream control device is realized through the relay protection device with the gateway function, and the data related to control in the communication process is stored through a data center, so that the unified management of the data is realized.
Example five
The embodiment provides a relay protection device with a gateway function, which is used for executing the communication method of the relay protection device with the gateway function in the first embodiment. The relay protection device can be located in a switch cabinet or can be independently arranged, and can execute the same operation as the gateway.
Fig. 5A is a schematic structural diagram of a relay protection device with gateway function according to the present embodiment. The relay protection device with gateway function comprises a first receiving unit 501, a first determining unit 502, a first transmitting unit 503, a second receiving unit 504 and a second transmitting unit 505.
The first receiving unit 501 is configured to receive a control command sent by an upstream SCADA system, where the control command includes identification information and control data of a control object; the first determining unit 502 is configured to determine, according to the identification information of the control object, a downstream control device corresponding to the control object, where the downstream control device is configured to control the control object according to the control data; the first sending unit 503 is configured to send a control instruction to the downstream control device, where the control instruction is information that can be identified by the downstream control device generated according to the control instruction; the second receiving unit 504 is configured to receive a control feedback message sent by the downstream control device according to the control instruction, where the control feedback message is used to indicate whether the downstream control device successfully executes the control instruction; the second transmitting unit 505 is configured to transmit an execution result, which is information that can be recognized by the SCADA system generated based on the control feedback information, to the upstream SCADA system.
Optionally, as shown in fig. 5B, the relay protection device of this embodiment further includes a second determining unit 506, where the second determining unit 506 is configured to determine whether a control instruction can be sent to the downstream control device according to the identification information of the downstream control device, and if the determination result is yes, trigger the second sending unit 505.
Optionally, the second sending unit 505 is further configured to send, to the upstream SCADA system, quality information of data of the collection object corresponding to a downstream collection device, where the quality information is used to indicate whether the data of the collection object is correct.
The working method of each unit of this embodiment is the same as that of the previous embodiment, and will not be described here again.
According to the invention, the gateway function is integrated in the relay protection device, and the relay protection device can communicate with the downstream control equipment, so that the communication between the upstream SCADA system and the downstream control equipment is realized, no additional component is arranged, and the complexity of the system is not increased. In addition, after the downstream control equipment feeds back the control feedback information of the downstream control equipment, the relay protection device can generate an execution result according to the control feedback information, and then the result of executing the control command to the downstream of the upstream SCADA system equipment, so that whether the control command is successfully executed can be accurately fed back.
Example six
The relay protection device of the fifth embodiment is further described in a supplementary manner.
Fig. 6 is a schematic structural diagram of the relay protection device according to the present embodiment. The relay protection device further comprises a first storage unit 601, a first generation unit 602, a second storage unit 603 and a second generation unit 604. Wherein the first storage unit 601 and the first generation unit 602 may exist alone, i.e. without the second storage unit 603 and the second generation unit 604; or the second storage unit 603 and the second generation unit 604 may exist alone, i.e., without the first storage unit 601 and the first generation unit 602, or simultaneously as shown in fig. 6.
The first storage unit 601 is configured to store the control command to a preset data center 80; the first generating unit 602 is configured to receive a control command sent by the data center 80, and generate a control command that can be identified by a downstream control device according to the control command.
The second storage unit 603 is configured to store the control feedback information to the data center 80; the second generating unit 604 is configured to receive the control feedback information sent by the data center 80, and generate the execution result that can be identified by the upstream SCADA system according to the control feedback information.
The first receiving unit 501, the first storage unit 601, the first generating unit 602, and the second sending unit 505 may be located on the same circuit board of the relay protection device, and the first determining unit 502, the first sending unit 503, the second receiving unit 504, the second storage unit 603, and the second generating unit 604 may be located on the same circuit board of the relay protection device. The data center 80 may be located on another circuit board. The circuit boards can communicate with each other.
The working method of each unit of this embodiment is the same as that of the previous embodiment, and will not be described here again.
According to the embodiment, communication between the upstream SCADA system and the downstream control device is realized through the relay protection device with the gateway function, and data related to control in the communication process is stored through a data center 80, so that unified management of the data is realized.
Example seven
The embodiment further supplements the relay protection device in the foregoing embodiment.
Fig. 7 is a schematic structural diagram of the relay protection device according to the present embodiment. The second receiving unit 504 of the relay protection apparatus is further configured to receive data of an acquisition object sent by a downstream acquisition device. In addition, the relay protection device further includes an identification unit 701, configured to identify whether the data of the collection object changes, and if the identification result is yes, actively send the current data of the collection object to a preset data center 80.
Optionally, the relay protection device further includes a first determining unit 702, configured to determine whether the collection object of the downstream collection device is one of the subscribed objects of the data center 80, and if the determination result is yes, trigger the identifying unit 701.
Optionally, the relay protection device further includes a second judging unit 703, configured to judge whether the collected object is one of the subscribed objects of the upstream SCADA system, and if the result of the judgment is yes, actively send the data of the collected object of the downstream collecting device to the upstream SCADA system.
The working method of each unit of this embodiment is the same as that of the previous embodiment, and will not be described here again.
According to the embodiment, through subscribing the object in advance, the changed data of the object can be selectively sent to the device subscribing the object, so that timeliness can be ensured, information interaction can be reduced, and communication efficiency is improved.
The invention also provides a relay protection device which comprises at least one memory and at least one processor. The memory is used for storing instructions. The processor is configured to execute the communication method of the relay protection device with gateway function described in any of the foregoing embodiments according to the instruction stored in the memory.
Embodiments of the present invention also provide a readable storage medium. The readable storage medium has stored therein machine readable instructions which, when executed by a machine, perform the method of communication of a relay protection device with gateway functionality described in any of the previous embodiments.
The readable medium has stored thereon machine readable instructions which, when executed by a processor, cause the processor to perform any of the methods described above. In particular, a system or apparatus may be provided with a readable storage medium having stored thereon software program code implementing the functions of any of the above embodiments, and having a computer or processor of the system or apparatus read out and execute machine readable instructions stored in the readable storage medium.
In this case, the program code itself read from the readable medium may implement the functions of any of the above-described embodiments, and thus the machine-readable code and the readable storage medium storing the machine-readable code form part of the present invention.
Examples of readable storage media include floppy disks, hard disks, magneto-optical disks, optical disks (e.g., CD-ROMs, CD-R, CD-RWs, DVD-ROMs, DVD-RAMs, DVD-RWs, DVD+RWs), magnetic tapes, nonvolatile memory cards, and ROMs. Alternatively, the program code may be downloaded from a server computer or cloud by a communications network.
It will be appreciated by those skilled in the art that various changes and modifications can be made to the embodiments disclosed above without departing from the spirit of the invention. Accordingly, the scope of the invention should be limited only by the attached claims.
It should be noted that not all the steps and units in the above flowcharts and the system configuration diagrams are necessary, and some steps or units may be omitted according to actual needs. The execution sequence of the steps is not fixed and can be adjusted as required. The apparatus structures described in the above embodiments may be physical structures or logical structures, that is, some units may be implemented by the same physical entity, or some units may be implemented by multiple physical entities, or may be implemented jointly by some components in multiple independent devices.
In the above embodiments, the hardware unit may be mechanically or electrically implemented. For example, a hardware unit or processor may include permanently dedicated circuitry or logic (e.g., a dedicated processor, FPGA, or ASIC) to perform the corresponding operations. The hardware unit or processor may also include programmable logic or circuitry (e.g., a general purpose processor or other programmable processor) that may be temporarily configured by software to perform the corresponding operations. The particular implementation (mechanical, or dedicated permanent, or temporarily set) may be determined based on cost and time considerations.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (18)

1. The communication method of the relay protection device with the gateway function comprises the following steps:
receiving a control command sent by an upstream SCADA system, wherein the control command comprises identification information and control data of a control object;
determining a downstream control device corresponding to the control object according to the identification information of the control object, wherein the downstream control device is used for controlling the control object according to the control data;
Transmitting a control instruction to the downstream control equipment, wherein the control instruction is information which is generated according to the control instruction and can be identified by the downstream control equipment;
receiving control feedback information sent by the downstream control equipment according to the control instruction, wherein the control feedback information is used for indicating whether the downstream control equipment successfully executes the control instruction;
and sending an execution result to the upstream SCADA system, wherein the execution result is information which can be identified by the SCADA system and is generated according to the control feedback information.
2. The communication method according to claim 1, wherein,
after receiving a control command sent by an upstream SCADA system and before determining a downstream control device corresponding to the control object according to the identification information of the control object, the method further comprises: storing the control command to a preset data center;
after storing the control command in a preset data center and before sending a control command to the downstream control device, the method further comprises: receiving the control command sent by the data center;
and generating a control instruction which can be identified by the downstream control equipment according to the control command.
3. The communication method according to claim 1, wherein after receiving a control feedback information transmitted by the downstream control device according to the control instruction and before transmitting an execution result to the upstream SCADA system, further comprising: storing the control feedback information to the data center;
after storing the control feedback information to the data center and before sending an execution result to the upstream SCADA system, further comprising:
receiving the control feedback information sent by the data center;
and generating the execution result which can be identified by the upstream SCADA system according to the control feedback information.
4. The communication method according to claim 1, characterized by further comprising, after determining a downstream control device to which the control object corresponds according to the identification information of the control object, and before transmitting the control instruction to the downstream control device:
determining whether the control instruction can be sent to the downstream control equipment according to the identification information of the downstream control equipment;
and if the result of the determination is yes, executing the operation of sending the control instruction to the downstream control equipment.
5. The communication method according to claim 1, characterized by further comprising:
and receiving data of an acquisition object sent by downstream acquisition equipment, identifying whether the data of the acquisition object changes, and if so, actively sending the current data of the acquisition object to a preset data center.
6. The communication method according to claim 5, further comprising, before identifying whether the data of the acquisition object changes:
judging whether the acquisition object of the downstream acquisition equipment is one of subscribed objects of the data center;
and if so, executing the operation of identifying whether the data of the acquisition object changes.
7. The communication method according to claim 5, further comprising, after identifying whether the data of the acquisition object has changed:
judging whether the acquisition object is one of subscribed objects of the upstream SCADA system;
and if the judgment result is yes, actively transmitting the data of the acquisition object of the downstream acquisition equipment to the upstream SCADA system.
8. The communication method according to claim 1, characterized by further comprising:
And sending quality information of the data of the acquisition object corresponding to the downstream acquisition equipment to the upstream SCADA system, wherein the quality information is used for indicating whether the data of the acquisition object is correct or not.
9. A communication method according to any one of claims 1 to 8, characterized in that,
the data center is an IEC 168450 data center.
10. Relay protection device with gateway function includes:
a first receiving unit, configured to receive a control command sent by an upstream SCADA system, where the control command includes identification information and control data of a control object;
a first determining unit, configured to determine a downstream control device corresponding to the control object according to the identification information of the control object, where the downstream control device is configured to control the control object according to the control data;
a first sending unit, configured to send a control instruction to the downstream control device, where the control instruction is information that is generated according to the control instruction and can be identified by the downstream control device;
a second receiving unit, configured to receive a control feedback message sent by the downstream control device according to the control instruction, where the control feedback message is used to indicate whether the downstream control device successfully executes the control instruction;
And a second sending unit, configured to send an execution result to the upstream SCADA system, where the execution result is information that can be identified by the SCADA system and is generated according to the control feedback information.
11. The relay protection device of claim 10, further comprising:
a first storage unit for storing the control command to a preset data center;
and the first generation unit is used for receiving the control command sent by the data center and generating a control command which can be identified by the downstream control equipment according to the control command.
12. The relay protection device of claim 10, further comprising:
a second storage unit for storing the control feedback information to the data center;
and the second generation unit is used for receiving the control feedback information sent by the data center and generating the execution result which can be identified by the upstream SCADA system according to the control feedback information.
13. The relay protection device of claim 10, further comprising:
and the second determining unit is used for determining whether the control instruction can be sent to the downstream control equipment according to the identification information of the downstream control equipment, and triggering the second sending unit if the determination result is yes.
14. The relay protection device of claim 10, wherein the second receiving unit is further configured to receive data of an acquisition object sent by a downstream acquisition device;
the relay protection device further comprises:
and the identification unit is used for identifying whether the data of the acquisition object changes or not, and if the identification result is yes, the identification unit actively transmits the current data of the acquisition object to a preset data center.
15. The relay protection device of claim 14, further comprising:
a first judging unit, configured to judge whether an acquisition object of the downstream acquisition device is one of subscribed objects of the data center, and if yes, trigger the identifying unit; or (b)
And a second judging unit, configured to judge whether the acquisition object is one of subscribed objects of the upstream SCADA system, and if the judgment result is yes, actively send the data of the acquisition object of the downstream acquisition device to the upstream SCADA system.
16. The relay protection device according to claim 10, wherein the second sending unit is further configured to send quality information of data of an acquisition object corresponding to a downstream acquisition device to the upstream SCADA system, where the quality information is used to indicate whether the data of the acquisition object is correct.
17. Relay protection device with gateway function, its characterized in that includes:
at least one memory for storing instructions;
at least one processor for executing the communication method of the gateway-enabled relay protection device according to any one of claims 1-9 according to the instructions stored by the memory.
18. A readable storage medium, characterized in that the readable storage medium has stored therein machine readable instructions, which when executed by a machine, perform the communication method of the gateway-enabled relay protection device according to any of claims 1-9.
CN202311092762.4A 2023-08-28 2023-08-28 Communication method of relay protection device with gateway function and relay protection device Pending CN117154931A (en)

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