CN214954017U - Optical fiber ring network communication system suitable for low-current grounding line selection device - Google Patents
Optical fiber ring network communication system suitable for low-current grounding line selection device Download PDFInfo
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- CN214954017U CN214954017U CN202121681163.2U CN202121681163U CN214954017U CN 214954017 U CN214954017 U CN 214954017U CN 202121681163 U CN202121681163 U CN 202121681163U CN 214954017 U CN214954017 U CN 214954017U
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Abstract
The utility model discloses an optical fiber looped network communication system suitable for undercurrent ground connection route selection device, including install in the busbar voltage interval be used for to busbar voltage and zero sequence voltage analog quantity carry on the voltage acquisition module gathered, install between the interval of two adjacent outgoing lines be used for gathering the current acquisition module of zero sequence current and install in the main control room be used for sending the main control unit of divide-shut brake information according to the sample value; the main controller, the voltage acquisition module and the current acquisition module on the line are connected in series through optical fibers to form an optical fiber ring network. The utility model discloses well main control unit and collection module distribution configuration, small, light in weight, mounted position is not restricted, adopts the looped netowrk communication that optic fibre kept apart, safe and reliable, the wiring quantity that has significantly reduced, easy to assemble or reform transform the wiring, improved transmission rate and ground connection algorithm's rate of accuracy.
Description
Technical Field
The utility model relates to a relay protection technical field, especially an optic fibre looped netowrk communication system suitable for undercurrent ground connection route selection device.
Background
The small-current grounding line selection device is suitable for single-phase grounding line selection of a 3-66 kV neutral point ungrounded or neutral point grounding system with a resistor and an arc suppression coil, is widely applied to industries such as electric power, metallurgy, coal mine, petroleum and chemical industry, can quickly and accurately search a grounding branch after a single-phase grounding fault occurs in an electric power system, timely eliminates the fault branch, and improves the operation reliability of the system.
At present, the small current grounding line selection devices widely used in power distribution networks in China are mostly centralized line selection, bus phase voltage and zero sequence voltage, secondary sampling lines of zero sequence current of each outgoing line, switching values of each outgoing line and the like need to be connected to a control device in a centralized mode, a large number of connecting cables are needed, and old stations are particularly difficult to modify. The existing patent provides a distributed grounding line selection method, and a relatively advanced wireless networking technology provided by Chinese patent CN211086548U effectively solves the wiring problem, but the installation position is limited by an electromagnetic environment, and a host terminal cannot reach a higher sampling rate due to the limitation of a transmission rate; chinese patent CN210167809U proposes a ring network concept, and the sampling rate that can be achieved by the control device is improved to a great extent, but bus voltage sampling is not distributed, which is not beneficial to flexibility when multiple segments of buses are applied, data transmission is based on a layered network structure, protocol overhead is large, and it is difficult to achieve a higher data sampling transmission rate.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that needs to solve provides an optic fibre looped netowrk communication system suitable for undercurrent ground connection route selection device, and the wiring is simple, and information transmission rate is high.
In order to solve the technical problem, the utility model adopts the following technical proposal.
An optical fiber ring network communication system suitable for a small current grounding line selection device comprises a voltage acquisition module, a current acquisition module and a main controller, wherein the voltage acquisition module is arranged at a bus voltage interval and used for acquiring bus voltage and zero sequence voltage analog quantity; the main controller, the voltage acquisition module and the current acquisition module on the line are connected in series through optical fibers to form an optical fiber ring network.
The optical fiber ring network communication system suitable for the low-current grounding line selection device is characterized in that the main controller and each acquisition module are respectively provided with a pair of high-speed optical fiber transceivers used for receiving ring network data sent by a previous module in an optical fiber ring network and sending the ring network data to a next module.
Due to the adoption of the technical scheme, the utility model has the following technical progress.
The utility model discloses well main control unit and collection module distribution configuration, small, light in weight, mounted position is not restricted, adopts the looped netowrk communication that optic fibre kept apart, safe and reliable, the wiring quantity that has significantly reduced, easy to assemble or reform transform the wiring, improved transmission rate and ground connection algorithm's rate of accuracy.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic circuit diagram of the voltage acquisition module according to the present invention;
fig. 3 is a schematic circuit diagram of the current collecting module according to the present invention;
fig. 4 is a schematic circuit diagram of the main controller according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
An optical fiber ring network communication system suitable for a low-current grounding line selection device is structurally shown in figure 1 and comprises a voltage acquisition module, a current acquisition module, a main controller and an optical fiber. The main controller, the voltage acquisition module and the current acquisition module on the line are connected in series through optical fibers to form an optical fiber ring network.
The voltage acquisition module is arranged at the bus voltage interval and used for acquiring three-phase bus voltage and zero sequence voltage, performing A/D conversion and performing ring network communication with an adjacent acquisition module or a main controller. The utility model discloses the circuit schematic of well voltage acquisition module is shown in fig. 2, gathers three-phase bus voltage, zero sequence voltage signal through input interface, and the signal of gathering carries out the transmission of signal through the fiber optic transceiver.
The current acquisition modules are arranged into a plurality of modules, are respectively installed between two adjacent outgoing line intervals and are used for acquiring zero sequence current of each outgoing line, carrying out A/D conversion, carrying out input quantity acquisition and output quantity output and carrying out ring network communication with the adjacent acquisition modules or the main controller. The utility model discloses well electric current collection module's circuit schematic diagram is shown in fig. 3, gathers zero sequence current signal through the input interface, and the signal acquisition who opens the volume of going into through opening into the interface, and the signal acquisition who opens the volume of going out through opening out the interface, the signal of gathering carries out the transmission of signal through the fiber optic transceiver.
The main controller is arranged in the main control room and used for sending switching-on and switching-off control information according to sampling values and switching states of the acquisition modules, analyzing terminal sampling information and combining a grounding line selection algorithm to realize a grounding line selection function. The utility model discloses well main control unit's circuit diagram schematic diagram is shown in FIG. 4, realizes the function of ground connection route selection according to sampling information and on-off state.
The main controller and each acquisition module are respectively provided with a pair of high-speed optical fiber transceivers (R, T), the high-speed optical fiber transceivers are used for receiving looped network data sent by a last module in an optical fiber looped network and sending the looped network data to a next module, one set of system consists of the main controller and a plurality of acquisition modules, the high-speed optical fiber transceivers T in front of the main controller are connected with the high-speed optical fiber transceivers R of a first acquisition module through optical fibers, the high-speed optical fiber transceivers T of the first acquisition module are connected with the high-speed optical fiber transceivers R of a second acquisition module through optical fibers, and the like, the high-speed optical fiber transceivers T of the last acquisition module are connected with the high-speed optical fiber transceivers R of the main controller through optical fibers, and a single-phase closed-loop looped network is formed. The utility model provides a high-speed fiber transceiver adopts AFBR-5803ATQZ transceiver.
The communication ends of the main controller, the voltage acquisition module and the current acquisition module and the optical fiber form an optical fiber ring network by adopting a high-efficiency free protocol.
The free protocol mainly comprises analog quantity sampling digital quantity and switching quantity effective data, synchronous data lead codes, terminal addresses, terminal types and end check codes, and is not based on an ISO (international standardization organization) equal-layer network protocol structure. And the adoption of the free protocol reduces the protocol overhead and realizes efficient communication.
When the device is initialized, the main controller sets addresses and networks for each module in the ring network through a networking message command, the main controller sends a data uploading command to a first acquisition module after successful networking, the first acquisition module adds the information of the module to send to a second acquisition module after the message, the second acquisition module adds the information of the module to the received message and sends to a next module, and the rest is done in sequence, the last module sends the message added with the information of the module to the main controller, the main controller receives the message to analyze, and the main controller continuously sends the data uploading command according to sampling timing intervals to finish data sampling. The free protocol is used by a private network, the protocol overhead only comprises a small number of data bits such as a data lead code, a terminal address, a terminal type and an end check code for data synchronization, and the multi-layer protocol overhead related to an ISO-based hierarchical network does not exist.
The utility model discloses can take the real-time scheme of polycyclic net, increase the selection line number, improve the speed of transmission.
Claims (2)
1. The utility model provides an optical fiber looped netowrk communication system suitable for undercurrent ground connection route selection device which characterized in that: the system comprises a voltage acquisition module arranged at a bus voltage interval and used for acquiring bus voltage and zero sequence voltage analog quantity, a current acquisition module arranged between two adjacent outgoing line intervals and used for acquiring zero sequence current, and a main controller arranged in a main control room and used for sending switching-on and switching-off information according to sampling values, wherein the main controller, the voltage acquisition module and the current acquisition module on a circuit are connected in series through optical fibers to form an optical fiber ring network.
2. The optical fiber ring network communication system suitable for the low current grounding line selection device as claimed in claim 1, wherein: the main controller and each acquisition module are respectively provided with a pair of high-speed optical fiber transceivers for receiving ring network data sent by the last module in the optical fiber ring network and sending the ring network data to the next module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121681163.2U CN214954017U (en) | 2021-07-23 | 2021-07-23 | Optical fiber ring network communication system suitable for low-current grounding line selection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121681163.2U CN214954017U (en) | 2021-07-23 | 2021-07-23 | Optical fiber ring network communication system suitable for low-current grounding line selection device |
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| Publication Number | Publication Date |
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| CN214954017U true CN214954017U (en) | 2021-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121681163.2U Active CN214954017U (en) | 2021-07-23 | 2021-07-23 | Optical fiber ring network communication system suitable for low-current grounding line selection device |
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| CN (1) | CN214954017U (en) |
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2021
- 2021-07-23 CN CN202121681163.2U patent/CN214954017U/en active Active
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