CN104078945B - Busbar differential protection optimization method and busbar differential protection system for intelligent transformer substation - Google Patents
Busbar differential protection optimization method and busbar differential protection system for intelligent transformer substation Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/16—Electric power substations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a busbar differential protection optimization method and a busbar differential protection system for an intelligent transformer substation. The method comprises the steps of grouping merging units, arranging two network ports capable of transmitting sampling value data frames with different priorities on each merging unit according to a group of the merging unit, and connecting with two networks, and allowing busbar differential protection equipment to select the sampling value data frame with the high priority for busbar differential protection calculation when receiving the sampling value data frames with the same data content. The device comprises a busbar differential protection device and two merging unit groups, wherein each merging unit group is connected with the two networks respectively via the two network ports capable of transmitting the sampling value data frames with the different priorities, and further, the sampling value data frames with different priorities can be transmitted to the busbar differential protection device, so that the busbar differential protection equipment operates quickly. The method and the system can effectively improve the performance of a communication network of a process level, particularly has the characteristic of quick operation of busbar differential protection, and is high in efficiency and low in implementation cost.
Description
Technical Field
The invention relates to a network structure of an intelligent substation, in particular to a bus differential protection optimization method and a bus differential protection system of the intelligent substation.
Background
IEC 61850 is a common communication standard based on a universal network communication platform, which is proposed to facilitate management of various intelligent electronic devices in a substation and interconnection between devices. Under the mode that the IEC 61850-based intelligent substation process layer adopts a networking mode as a message transmission mode, the message end-to-end delay characteristic is an important index of the communication network performance, and the action characteristic of bay level protection is also influenced by the delay of the sampling value message network. The bus differential protection is not beneficial to the quick action of the bus differential protection because the real-time electrical quantity information of each line connected to the bus needs to be collected, the information quantity is large and the cross-interval transmission of the sampling value message is involved, so that the end-to-end delay of the message is large. The network structure based on the parallel redundancy protocol provides reliable hot backup for the intelligent substation communication network, so that the connectivity and the reliability of the intelligent substation communication network are greatly improved, the reliability, the real-time performance and the compatibility can be simultaneously considered, and the single failure zero recovery time of the communication network is realized.
A process layer network structure of the intelligent substation based on parallel redundancy is shown in fig. 1, wherein a TV and a TA in the process layer network structure are a voltage transformer and a current transformer and are used for collecting voltage and current signals of a primary side of a power system and transmitting electric quantity information to a merging unit; the merging unit receives the electric quantity information transmitted by the primary mutual inductor, merges and synchronously processes the electric quantity information, and forwards the processed digital signals to equipment used by a protection and measurement and control device according to a specific format; k1, K2 are circuit breakers, the switching gear used for closing, carrying and breaking the current under the condition of normal loop or abnormal loop; the circuit breaker controller is a device for receiving circuit breaker control information transmitted by a network and controlling the opening and closing of the circuit breaker; the protection and measurement and control device is a device for completing the relay protection function and the measurement and control function of corresponding equipment; the bus differential protection device utilizes the primary side digital voltage current information uploaded by the merging unit to calculate, and therefore the bus protection function of the transformer substation is completed. By adopting a Parallel Redundancy communication network, during operation, a Merging Unit (MU) sends sampling value information to two independent process layer A, B networks at the same time, a link Redundancy control module of the Merging Unit supporting a Parallel Redundancy Protocol (PRP) can perform ethernet encapsulation on data sent by a network layer, two generated data frames are sent to network interfaces of a network a and a network B from different ports, and the data transmitted in the network a and the network B are completely the same. The receiving end (protection and measurement and control device or bus differential protection unit) obtains the sampling value messages from the network A and the network B at the same time, preferentially utilizes the first received sampling value information, discards the other sampling value information, and gives an alarm if the information of the other network cannot be received. When the structures of the network A and the network B are similar and the wiring paths are similar, the network A and the network B have the same or similar network performance. When data is congested, two networks may be congested at the same time, which may result in an increase in data reception delay.
The bus differential protection unit can perform bus protection operation only after receiving electric quantity information of all line intervals transmitted in the network A or the network B, and only when one network fails, data information of the other redundant network is utilized, instead of fully utilizing the first-come electric quantity information in the two networks, so that a communication network adopting a parallel redundancy protocol in an intelligent substation does not improve the performance of a process-level communication network, particularly the quick action characteristic of bus differential protection, and the quick action characteristic of bus differential protection is particularly important in relation to the quick isolation of bus faults and the safe operation of a substation.
Disclosure of Invention
The invention aims to provide a bus differential protection optimization method and a bus differential protection system for an intelligent substation, and aims to solve the technical problem that a communication network adopting a parallel redundancy protocol in the intelligent substation does not improve the performance of a process layer communication network, particularly the quick action characteristic of bus differential protection.
In order to achieve the purpose, the invention provides a bus differential protection optimization method of an intelligent substation, which comprises the following steps:
s1: dividing merging units for sending sampling value data to the bus differential protection device into a first merging unit group and a second merging unit group, wherein the first merging unit group and the second merging unit group respectively comprise more than one merging unit;
s2: setting a first network port and a second network port on each merging unit in a first merging unit group, connecting the merging units in the first merging unit group with a first network through the first network ports and sending sampling value data frames to bus differential protection equipment through the first network, connecting the merging units in the first merging unit group with a second network through the second network ports and sending the sampling value data frames to the bus differential protection equipment through the second network; when the sampling value data is packaged, the first network port sets the priority of the sampling value data frame sent by the first network port to be higher than the priority of the sampling value data frame sent by the second network port;
s3: setting a third network port and a fourth network port on each merging unit in the second merging unit group, connecting the merging units in the second merging unit group with the first network through the third network ports and sending sampling value data frames to the bus differential protection device through the first network, and connecting the merging units in the second merging unit group with the second network through the fourth network ports and sending the sampling value data frames to the bus differential protection device through the second network; when the sampling value data is packaged, the fourth network port sets the priority of the sampling value data frame sent by the fourth network port to be higher than the priority of the sampling value data frame sent by the third network port;
s6: and the bus differential protection equipment performs bus differential protection calculation according to the received sampling value data frame, and selects the sampling value data frame with high priority to perform bus differential protection calculation when receiving the sampling value data frame with the same data content.
As a further improvement of the process of the invention:
setting the priority of the sampled value data frame transmitted by the first network port equal to the priority of the sampled value data frame transmitted by the fourth network port in steps S2 and S3; and setting the priority of the sampling value data frame sent by the second network port to be equal to the priority of the sampling value data frame sent by the third network port.
After step S3 is completed, before step S6 is performed, the method further includes the steps of:
s4: setting network ports and bus differential protection devices of all merging units connected with a first network in a first virtual local area network, and setting network ports and bus differential protection devices of all merging units connected with a second network in a second virtual local area network;
s5: the priority of the network ports in the first network connected to the first merging unit group is set to be higher than the priority of the network ports in the first network connected to the second merging unit group, and the priority of the network ports in the second network connected to the second merging unit group is set to be higher than the priority of the network ports in the second network connected to the first merging unit group.
As a general technical concept, the present invention further provides a bus bar protection system of an intelligent substation, including a bus bar protection device connected to a first network and a second network, and a first merging unit group and a second merging unit group, where the first merging unit group and the second merging unit group each include more than one merging unit; wherein,
a merging unit in the first merging unit group is provided with a first network port and a second network port, the merging unit in the first merging unit group is connected with a first network through the first network port and sends sampling value data to the bus differential protection device through the first network, and the merging unit in the first merging unit group is connected with a second network through the second network port and sends the sampling value data to the bus differential protection device through the second network; the priority of the sampling value data frame sent by the first network port is higher than that of the sampling value data frame sent by the second network port;
a merging unit in the second merging unit group is provided with a third network port and a fourth network port, the merging unit in the second merging unit group is connected with the first network through the third network port and sends a sampling value data frame to the bus differential protection device through the first network, and the merging unit in the second merging unit group is connected with the second network through the fourth network port and sends the sampling value data frame to the bus differential protection device through the second network; the priority of the sampling value data frame sent by the fourth network port is higher than that of the sampling value data frame sent by the third network port.
As a further improvement of the system of the invention:
the priority of the sampling value data frame sent by the first network port is equal to the priority of the sampling value data frame sent by the fourth network port, and the priority of the sampling value data frame sent by the second network port is equal to the priority of the sampling value data frame sent by the third network port.
The difference between the number of merge units in the first merge unit group and the number of merge units in the second merge unit group is less than or equal to one.
The network ports of all the merging units connected with the first network and the bus differential protection device are both in the first virtual local area network, and the network ports of all the merging units connected with the second network and the bus differential protection device are both in the second virtual local area network.
The merging unit in the first merging unit group is connected to the switch connected with the first network through the first network port and is connected to the switch connected with the second network through the second network port;
the merging unit in the second merging unit group is connected to the switch connected to the first network through the third network port, and is connected to the switch connected to the second network through the fourth network port.
The invention has the following beneficial effects:
1. the bus differential protection optimization method of the intelligent substation utilizes the parallel redundant network to simultaneously transmit the voltage and current information required by bus differential protection calculation through the network and port arrangement, sets different priorities for the sampling data frames with the same content sent by different networks in the parallel redundant network, and the bus differential protection device preferentially utilizes the messages with high priorities according to the different priorities of the received messages (sampling data frames), performs bus differential protection calculation after receiving the messages sent by all merging units, and then judges whether bus differential protection acts or not, thus reducing the time required for the bus differential protection to receive all the interval merging unit information and process the information, accelerating the fast action of the bus differential protection, isolating faults more quickly, effectively improving the performance of a process layer communication network, particularly the fast action characteristic of the bus differential protection, high efficiency and low implementation cost.
2. The bus differential protection system of the intelligent substation realizes that the sampling data frames with the same content sent by different networks are set with different priorities in the parallel redundant network through grouping of the merging units and priority differentiation of network ports on the basis of the original network structure, so that the bus differential protection device can select the adopted sampling value data frames according to different priorities of received messages (sampling data frames), calculate and act as soon as possible, isolate faults more quickly, and has higher efficiency and low implementation cost.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a process level network architecture of a background art intelligent substation;
fig. 2 is a schematic flow chart of a busbar differential protection optimization method of an intelligent substation according to a preferred embodiment of the present invention;
FIG. 3 is a schematic diagram of a bus bar protection system of an intelligent substation according to a preferred embodiment of the present invention; and
fig. 4 is a schematic diagram of a received data frame queue (queue X) of a network port connected to the a-network and a received data frame queue (queue Y) of a network port connected to the B-network of the bus differential protection device in fig. 3.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
Referring to fig. 2, the bus differential protection optimization method for the intelligent substation of the present invention includes the following steps:
s1: the merging units that transmit the sample value data to the bus differential protection device are divided into a first merging unit group and a second merging unit group, and the first merging unit group and the second merging unit group each include more than one merging unit.
S2: setting a first network port and a second network port on each merging unit in a first merging unit group, connecting the merging units in the first merging unit group with a first network through the first network ports and sending sampling value data frames to bus differential protection equipment through the first network, connecting the merging units in the first merging unit group with a second network through the second network ports and sending the sampling value data frames to the bus differential protection equipment through the second network; when the sampling value data is packaged, the first network port sets the priority of the sampling value data frame transmitted by the first network port to be higher than the priority of the sampling value data frame transmitted by the second network port.
S3: setting a third network port and a fourth network port on each merging unit in the second merging unit group, connecting the merging units in the second merging unit group with the first network through the third network ports and sending sampling value data frames to the bus differential protection device through the first network, and connecting the merging units in the second merging unit group with the second network through the fourth network ports and sending the sampling value data frames to the bus differential protection device through the second network; when the sampling value data is packaged, the fourth network port sets the priority of the sampling value data frame sent by the fourth network port to be higher than the priority of the sampling value data frame sent by the third network port.
S6: and the bus differential protection equipment performs bus differential protection calculation according to the received sampling value data frame, and selects the sampling value data frame with high priority to perform bus differential protection calculation when receiving the sampling value data frame with the same data content.
The method comprises the steps of simultaneously transmitting voltage and current information required by bus differential protection calculation by using a parallel redundant network, setting different priorities for sampling data frames with the same content sent by different networks in the parallel redundant network, preferentially utilizing messages with high priorities according to different priorities of received messages (sampling data frames), carrying out bus differential protection calculation after receiving the messages sent by all merging units, and then judging whether bus differential protection acts, so that the time required by the bus differential protection for receiving all interval merging unit information can be reduced, the fast action of the bus differential protection is accelerated, faults are isolated more quickly, the performance of a process layer communication network, particularly the fast action characteristic of the bus differential protection, is effectively improved, the efficiency is high, and the implementation cost is low.
In this embodiment, the above method may be further optimized and improved as follows.
Setting the priority of the sampled value data frame transmitted by the first network port equal to the priority of the sampled value data frame transmitted by the fourth network port in steps S2 and S3; and setting the priority of the sampling value data frame sent by the second network port to be equal to the priority of the sampling value data frame sent by the third network port. Therefore, the information of all merging units required by the bus differential protection calculation is divided into two parts and is transmitted in the first network (A network) and the second network (B network) simultaneously, the priority only needs to be set into two different levels, and the data processing time is reduced.
After step S3 is completed, before step S6 is performed, the above method may further include the steps of:
s4: and setting the network ports and the bus differential protection devices of all the merging units connected with the first network in the first virtual local area network, and setting the network ports and the bus differential protection devices of all the merging units connected with the second network in the second virtual local area network.
S5: the priority of the network ports in the first network connected to the first merging unit group is set to be higher than the priority of the network ports in the first network connected to the second merging unit group, and the priority of the network ports in the second network connected to the second merging unit group is set to be higher than the priority of the network ports in the second network connected to the first merging unit group.
Therefore, through the matching cooperation of the settings with different priorities, the division of the merging units and the settings of the virtual local area network and the network ports, the information of all the merging units required by the bus differential protection calculation is divided into two parts and is simultaneously transmitted in the first network (A network) and the second network (B network), the information transmission time is reduced, the bus differential protection can receive the required merging unit information more quickly, the rapid processing and the protection judgment are carried out through the priority identification, and the fault can be isolated more quickly.
Referring to fig. 3 and 4, the bus bar protection system of the intelligent substation of the present invention includes a bus bar protection device respectively connected to a first network (in this embodiment, the network a in fig. 3) and a second network (in this embodiment, the network B in fig. 3), and a first merging unit group (in this embodiment, a1, a2, and a3 in fig. 3) and a second merging unit group (in this embodiment, B1, B2, and B3 in fig. 3), where each of the first merging unit group and the second merging unit group includes more than one merging unit; the merging unit in the first merging unit group is connected with a first network through the first network port and sends sampling value data to the bus differential protection equipment through the first network, and the merging unit in the first merging unit group is connected with a second network through the second network port and sends the sampling value data to the bus differential protection equipment through the second network; the priority of the sampling value data frame sent by the first network port (see fig. 3, in this embodiment, the priority is set to 6) is higher than the priority of the sampling value data frame sent by the second network port (see fig. 3, in this embodiment, the priority is set to 5); a merging unit in the second merging unit group is provided with a third network port and a fourth network port, the merging unit in the second merging unit group is connected with the first network through the third network port and sends a sampling value data frame to the bus differential protection device through the first network, and the merging unit in the second merging unit group is connected with the second network through the fourth network port and sends the sampling value data frame to the bus differential protection device through the second network; the priority of the sampled value data frame sent by the fourth network port (see fig. 3, in this embodiment, the priority is set to 6) is higher than the priority of the sampled value data frame sent by the third network port (see fig. 3, in this embodiment, the priority is set to 5).
The bus differential protection system with the structure can preferentially utilize the messages with high priority according to the difference of the priorities of the received messages, carry out bus differential protection calculation after receiving the messages sent by all the merging units, and then judge whether bus differential protection acts or not, so that the time for receiving all the interval merging unit information and processing the information by the bus differential protection can be reduced, the rapid action of the bus differential protection is accelerated, and faults are isolated more rapidly.
In this embodiment, the priority of the sampling value data frame sent by the first network port is equal to the priority of the sampling value data frame sent by the fourth network port, and the priority of the sampling value data frame sent by the second network port is equal to the priority of the sampling value data frame sent by the third network port. Therefore, the information of all merging units required for carrying out bus differential protection calculation can be divided into two parts and transmitted simultaneously in the first network (A network) and the second network (B network) (the transmission flow is shown by arrows in figure 3), the priority only needs to be set into two different levels, and the data processing time is reduced.
In this embodiment, a difference between the number of merging units in the first merging unit group and the number of merging units in the second merging unit group is smaller than or equal to one, when the total number of merging units is an even number, the number of merging units in the first merging unit group is equal to the number of merging units in the second merging unit group, and when the total number of merging units is an odd number, the number of merging units in the first merging unit group is different from the number of merging units in the second merging unit group by one.
In this embodiment, the network ports of all the merging units connected to the first network and the bus differential protection device are both in the first virtual local area network, and the network ports of all the merging units connected to the second network and the bus differential protection device are both in the second virtual local area network. The setting can ensure that the information of the corresponding merging unit is only transmitted in the corresponding virtual local area network, and the occurrence of network storm is avoided.
In practical use, the connection between networks is usually realized through a switch for the convenience of connection. In this embodiment, the merging unit in the first merging unit group may be connected to the switch connected to the first network through the first network port, and connected to the switch connected to the second network through the second network port; the merging unit in the second merging unit group is connected to the switch connected to the first network through the third network port, and is connected to the switch connected to the second network through the fourth network port.
In summary, the bus differential protection system of the intelligent substation of the present invention, through the division of the merging units, the network ports and the virtual local area network, and the like, enables the bus differential protection device to preferentially utilize the messages with high priority according to the different priorities of the received messages (see fig. 4, in the figure, two queues X, Y indicate the sequence of the transmitted merging unit data frames in the a network and the B network to reach the bus differential protection device according to the priority, in the X queue, since the priority of the sampling value information sent by the merging units a1, a2 and a3 to the a network is higher than the priority of the information sent by the merging units B1, B2 and B3 to the a network, the information of the merging units a1, a2 and a3 reaches the bus differential protection device before the merging units B1, B2 and B3, and since the priorities are the same, the arrangement order between a1, a2 and a3 and the arrangement order between B1, B2 and B3 are random, the same principle is used for the arrival sequence of the information sent by the merging unit in the Y queue. ) And after receiving the messages sent by all the merging units, the bus differential protection calculation is carried out, and then whether the bus differential protection acts or not is judged, so that the time for receiving all the interval merging unit information and processing the information by the bus differential protection can be reduced, the rapid action of the bus differential protection is accelerated, and the fault is isolated more rapidly. The invention can effectively improve the performance of the process layer communication network, especially the fast action characteristic of bus differential protection, and has high efficiency and low implementation cost.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A bus differential protection optimization method of an intelligent substation is characterized by comprising the following steps:
s1: dividing merging units for sending sampling value data to busbar differential protection equipment into a first merging unit group and a second merging unit group, wherein the first merging unit group and the second merging unit group respectively comprise more than one merging unit;
s2: setting a first network port and a second network port on each merging unit in the first merging unit group, connecting the merging units in the first merging unit group with a first network through the first network port and sending sampled data frames to a bus differential protection device through the first network, and connecting the merging units in the first merging unit group with a second network through the second network port and sending sampled data frames to the bus differential protection device through the second network; when the sampling value data is packaged, the first network port sets the priority of the sampling value data frame sent by the first network port to be higher than the priority of the sampling value data frame sent by the second network port;
s3: setting a third network port and a fourth network port on each merging unit in the second merging unit group, connecting the merging units in the second merging unit group with the first network through the third network ports, sending the sampled data frames to the bus differential protection device through the first network, and connecting the merging units in the second merging unit group with the second network through the fourth network ports, and sending the sampled data frames to the bus differential protection device through the second network; when the sampling value data is packaged, the fourth network port sets the priority of the sampling value data frame sent by the fourth network port to be higher than the priority of the sampling value data frame sent by the third network port;
in the step S2 and the step S3, setting the priority of the sampled value data frame transmitted by the first network port equal to the priority of the sampled value data frame transmitted by the fourth network port; setting the priority of the sampling value data frame sent by the second network port to be equal to the priority of the sampling value data frame sent by the third network port;
s6: and the bus differential protection equipment performs bus differential protection calculation according to the received sampling value data frame, and selects the sampling value data frame with high priority to perform bus differential protection calculation when receiving the sampling value data frame with the same data content.
2. The bus differential protection optimization method according to claim 1, wherein after the step S3 is completed and before the step S6 is performed, the method further comprises the steps of:
s4: setting network ports and bus differential protection devices of all merging units connected with the first network in a first virtual local area network, and setting network ports and bus differential protection devices of all merging units connected with the second network in a second virtual local area network;
s5: setting the priority of the network port connected to the first merging unit group in the first network to be higher than the priority of the network port connected to the second merging unit group in the first network, and setting the priority of the network port connected to the second merging unit group in the second network to be higher than the priority of the network port connected to the first merging unit group in the second network.
3. A bus differential protection system of an intelligent substation is characterized in that,
the system comprises a bus differential protection device, a first merging unit group and a second merging unit group, wherein the bus differential protection device is respectively connected with a first network and a second network; wherein,
a merging unit in the first merging unit group is provided with a first network port and a second network port, the merging unit in the first merging unit group is connected with the first network through the first network port and sends sampling value data to the bus differential protection device through the first network, and the merging unit in the first merging unit group is connected with the second network through the second network port and sends sampling value data to the bus differential protection device through the second network; the priority of the sampling value data frame sent by the first network port is higher than that of the sampling value data frame sent by the second network port;
a merging unit in the second merging unit group is provided with a third network port and a fourth network port, the merging unit in the second merging unit group is connected to the first network through the third network port and transmits the sampled data frame to the bus differential protection device through the first network, and the merging unit in the second merging unit group is connected to the second network through the fourth network port and transmits the sampled data frame to the bus differential protection device through the second network; the priority of the sampling value data frame sent by the fourth network port is higher than that of the sampling value data frame sent by the third network port;
the priority of the sampling value data frame sent by the first network port is equal to the priority of the sampling value data frame sent by the fourth network port, and the priority of the sampling value data frame sent by the second network port is equal to the priority of the sampling value data frame sent by the third network port.
4. The bus differential protection system of claim 3,
the difference between the number of merge units in the first merge unit group and the number of merge units in the second merge unit group is less than or equal to one.
5. The bus differential protection system of claim 3,
network ports of all merging units connected with the first network and the bus differential protection device are both in a first virtual local area network, and network ports of all merging units connected with the second network and the bus differential protection device are both in a second virtual local area network.
6. The bus differential protection system of claim 3,
the merging unit in the first merging unit group is connected to the switch connected to the first network through a first network port, and is connected to the switch connected to the second network through a second network port;
and the merging unit in the second merging unit group is connected to the switch connected with the first network through a third network port and is connected to the switch connected with the second network through a fourth network port.
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| CN103633741A (en) * | 2013-12-05 | 2014-03-12 | 长园深瑞继保自动化有限公司 | Intelligent substation sampled value network data switching method and device |
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