CN116032005A - Station terminal with digital architecture and fault discrimination method - Google Patents
Station terminal with digital architecture and fault discrimination method Download PDFInfo
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- CN116032005A CN116032005A CN202211629330.8A CN202211629330A CN116032005A CN 116032005 A CN116032005 A CN 116032005A CN 202211629330 A CN202211629330 A CN 202211629330A CN 116032005 A CN116032005 A CN 116032005A
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Abstract
The invention belongs to the technical field of power distribution devices, and particularly relates to a station terminal with a digital architecture and a fault discrimination method. The station terminal main control unit is used for collecting alternating voltage in the PT cabinet, receiving current converted by the digital sensing unit, remote signaling, remote sensing and remote sensing digital signals, performing logic operation after synchronization, and issuing parameters and instructions to the digital sensing unit through a digital channel; the digital sensing unit is used for collecting traffic and remote signaling, remote sensing and remote sensing signals of the ring main unit incoming and outgoing line cabinet, converting the traffic and remote sensing signals into digital values and transmitting the digital values to the main control unit; receiving an instruction of the main control unit, and performing remote control operation and state display of the line inlet and outlet cabinet; the main control unit is connected with the digital sensing unit through a digital bus. The invention improves the anti-interference performance and stability of the alternating current transmission of the station terminal through the digital architecture, reduces the use amount and length of the cable in the ring main unit, improves the expandability of the station terminal, and improves the convenience of installation and maintenance.
Description
Technical Field
The invention belongs to the technical field of power distribution devices, and particularly relates to a station terminal with a digital architecture and a fault discrimination method.
Background
The station terminals of the medium-voltage distribution network are centralized and decentralized, and the existing centralized station terminals need to connect alternating voltage and current in the ring main unit to the centralized station terminals through cables; the terminal of the distributed station is required to connect alternating voltage quantity to a spacing unit on each spacing cabinet through a cable, and the two modes of cable are long in length, poor in simulation stability, poor in reliability and troublesome in installation and operation; and the capacity expansion of the station terminals with two architectures is very difficult, and alternating voltage or current is required to be led out of the through cabinet body through the PT cabinet or the interval cabinet of the ring main unit and then connected to the newly added cabinet. Based on this, a new digital architecture of the station terminal is urgently needed.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a station terminal with a digital architecture and a fault judging method.
The technical scheme for solving the technical problems is as follows:
a station terminal with a digital architecture comprises a PT cabinet, an incoming and outgoing line cabinet, a main control unit and a digital sensing unit;
the main control unit is used for collecting alternating voltage in the PT cabinet, receiving telemetry and remote signaling digital signals converted by the digital sensing unit, performing logic operation after synchronization, and sending parameters and instructions to the digital sensing unit through a digital channel;
the digital sensing unit is used for collecting signals such as alternating current quantity, remote signaling and state of the ring main unit incoming and outgoing line cabinet, converting the signals into digital quantity and transmitting the digital quantity to the main control unit; receiving an instruction of the main control unit, and performing remote control operation and state display of the line inlet and outlet cabinet; the local opening and closing operation of the local wire inlet and outlet cabinet is completed;
the main control unit is connected with the digital sensing unit through a digital bus.
Further, the main control unit comprises a first communication module, a central processing unit, a line loss module and a fault analysis module, the central processing unit adopts a domestic CPU+a large-scale programmable logic array FPGA to conduct zoning processing on the central processing unit, different areas process data of different modules, the first communication module is analyzed and controlled by an area of the central processing unit responsible for a communication module process, the line loss module is analyzed and calculated by an area of the central processing unit responsible for the line loss module process, and the fault analysis module is analyzed and calculated by an area of the central processing unit responsible for a fault analysis module process.
Further, the first communication module is used for receiving the converted current and the digital signals such as remote signaling and state from the digital sensing unit, and sending parameters and instructions to the digital sensing unit.
Further, the line loss module calculates electric quantity according to the acquired data of synchronous alternating voltage in the PT cabinet and alternating current in the interval cabinet, and obtains electric energy and line loss pulse.
Further, the fault analysis module is used for judging faults such as line short circuit, grounding and the like by analyzing the synchronized telemetry data, and recovering power supply of a non-fault area by logic analysis.
Further, the main control unit comprises a voltage power supply unit for providing working power and operating power.
Further, the digital sensing unit comprises an acquisition module, an A/D conversion module, a central processing module and a second communication module, wherein the acquisition module is used for acquiring the alternating current quantity and remote signaling signals of the ring main unit incoming and outgoing line cabinet; the A/D conversion module is used for converting the acquired telemetry signals of the ring main unit in-out line cabinet into digital signals; the central processing module is used for receiving an instruction of the main control unit to perform remote control operation and state display of the line inlet and outlet cabinet, completing local opening and closing operation of the line inlet and outlet cabinet, collecting digital quantity of local interval remote measurement and remote signaling and framing according to specifications; the second communication module is used for transmitting the traffic and remote signaling digital signals of the ring main unit incoming and outgoing line cabinet to the main control unit.
Further, the central processing module is also connected with a liquid crystal display module through a serial port; the central processing module is also connected with an indicator light module, and the indicator light module comprises indicator lights which are respectively matched with the control loops correspondingly; and the control panel is also provided with a plurality of opening and closing buttons, and each opening and closing button is respectively connected with a corresponding loop controller and correspondingly controls the on-off of one control loop.
Further, the main control unit is connected with the digital sensing unit through a BiFT3 bus.
The invention also discloses a station terminal fault judging method of the digital architecture, which comprises the following steps:
the digital sensing unit collects remote signaling and remote measuring signals of the ring main unit incoming and outgoing line cabinet, converts the remote signaling and remote measuring signals into digital quantities through the A/D conversion module and transmits the digital quantities to the main control unit;
the main control unit central processing unit collects alternating voltage quantity of the ring main unit PT cabinet and divides the alternating voltage quantity into areas to process information, and 5 receives data uploaded by the digital sensing unit through the communication module to complete synchronization;
analyzing the synchronized digital telemetry data, when a line short circuit or a ground fault occurs, the voltage and the current of the line are suddenly changed, calculating the voltage and the current of the line by a half-wave method and a transient characteristic method, and judging the fault type according to the magnitude, the time and the direction of the fault characteristic quantity exceeding a protection fixed value
The type and the protection action range, when the fault is judged to be in the area, the power supply in the area is not restored; and when the 0 fault is determined to be out of the area, switching on the area to supply power or recovering the power by switching the contact switch to the supply mode.
Compared with the prior art, the invention has the following technical effects:
(1) The invention improves the anti-interference performance and stability of the alternating current transmission of the station terminal through the digital architecture, reduces the use amount and length of the cable in the ring main unit, improves the expandability of the station terminal, and improves the convenience of installation and maintenance;
5 (2) the signal transmission between the main control unit and the sensing unit is digital signal, and the signal is transmitted through the shielding wire
The connection, high-speed serial interface transmission, strong anti-interference capability and high instantaneity ensure that analog quantity is in the PT cabinet and the wire inlet and outlet cabinet, the cabinet body is not out, the reliability and the safety are improved, the length and the number of cables in the ring main unit are reduced, the independence among the cabinet bodies is improved, the expansion of users is facilitated, the investment of the users is protected, and the low-carbon route is explored from the technical means;
0 (3) the digital architecture of the invention can reduce the use length and number of the cables in the ring main unit or the switching station
The amount of copper materials is reduced, and popularization of station terminals of a digital architecture can open up a low-carbon route for medium-voltage distribution networks;
(4) The invention achieves accurate research and judgment of the line faults through the logic of the station terminal of the digital architecture, isolates the faults and recovers the power supply of the non-fault area.
Description of the drawings
FIG. 1 is a schematic diagram of the overall structure of the system of the present invention.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
The invention discloses a station terminal with a digital architecture, which comprises a PT cabinet, an incoming and outgoing line cabinet, a main control unit and a digital sensing unit; the main control unit is used for collecting alternating current voltage in the PT cabinet, receiving digital signals such as alternating current quantity, remote signaling and state quantity after conversion from the digital sensing unit, carrying out logic operation after synchronization, and sending parameters and instructions to the digital sensing unit through a digital channel; the digital sensing unit is used for collecting signals such as traffic and remote signaling of the ring main unit incoming and outgoing line cabinet, and converting the signals into digital values to be sent to the main control unit; receiving an instruction of the main control unit, and performing remote control operation and state display of the line inlet and outlet cabinet; the local opening and closing operation of the local wire inlet and outlet cabinet is completed; the main control unit is connected with the digital sensing unit through a digital bus.
The invention improves the anti-interference performance and stability of the alternating current transmission of the station terminal through the digital architecture, reduces the use amount and length of the cable in the ring main unit, improves the expandability of the station terminal, and improves the convenience of installation and maintenance.
In the embodiment of the invention, the main control unit comprises a first communication module, a central processing unit, a line loss module and a fault analysis module, wherein the central processing unit adopts a domestic CPU+a large-scale programmable logic array FPGA to carry out zoning processing on the central processing unit, different areas process data of different modules, the first communication module is analyzed and controlled by the area of the central processing unit responsible for the communication module process, the line loss module is analyzed and calculated by the area of the central processing unit responsible for the line loss module process, and the fault analysis module is analyzed and calculated by the area of the central processing unit responsible for the fault analysis module process.
In a specific embodiment of the present invention, the first communication module is configured to receive the converted ac current and the digital signals such as the remote signaling and the state quantity from the digital sensing unit, and send the parameters and the instructions to the digital sensing unit.
In the specific embodiment of the invention, the line loss module multiplies the data synchronized by the alternating voltage in the PT cabinet and the alternating current in the outlet cabinet interval cabinet in the power measurement signal processing circuit after conversion until the instantaneous power is obtained, integrates the data into an electric energy signal after time, performs absolute value addition or algebraic value addition operation on the A/B/C three-phase electric energy, converts the result into a frequency signal according to a pulse constant, and obtains an electric energy pulse output signal which can be used for calibrating a meter.
In a specific embodiment of the present invention, the fault analysis module is configured to analyze the digital telemetry data after synchronization, when a line short circuit or a ground fault occurs, the line voltage and the current will be suddenly changed, calculate the half-wave method and the transient characteristic method for the line voltage and the current, and judge the fault type and the protection action range according to the magnitude, the time and the direction that the characteristic quantity of the fault exceeds the protection fixed value, and when it is determined that the fault is in the area, the power supply in the area is not restored; and when the fault is judged to be out of the area, switching on the area to supply power or recovering the power by switching the contact switch to the supply mode.
In a specific embodiment of the present invention, the main control unit includes a voltage power supply unit for providing a working power supply and an operating power supply.
In the embodiment of the invention, the digital sensing unit comprises an acquisition module, an A/D conversion module, a central processing module and a second communication module, wherein the acquisition module is used for acquiring signals such as traffic, remote signaling, state quantity and the like of the ring main unit incoming and outgoing line cabinet; the A/D conversion module is used for converting the collected signals such as traffic and remote signaling and state quantity of the ring main unit in and out of the line cabinet into digital signals; the central processing module is used for receiving an instruction of the main control unit to perform remote control operation and state display of the line inlet and outlet cabinet and complete local opening and closing operation of the line inlet and outlet cabinet; the second communication module is used for transmitting digital signals such as traffic volume, remote signaling, state quantity and the like of the ring main unit incoming and outgoing line cabinet to the main control unit.
In the embodiment of the invention, the central processing module is also connected with a liquid crystal display module through a serial port; the central processing module is also connected with an indicator light module, and the indicator light module comprises indicator lights which are respectively matched with the control loops correspondingly; and the control panel is also provided with a plurality of opening and closing buttons, and each opening and closing button is respectively connected with a corresponding loop controller and correspondingly controls the on-off of one control loop.
In a specific embodiment of the present invention, the main control unit is connected with the digital sensing unit through a BiFT3 bus, where the BiFT3 bus is a bidirectional full duplex transmission bus, and the sensing unit can transmit digital data to the main control unit in real time, and receive and execute an instruction sent by the main control unit.
The invention also discloses a station terminal fault judging method of the digital architecture, which comprises the following steps:
the digital sensing unit collects remote signaling and remote measuring signals of the ring main unit incoming and outgoing line cabinet, converts the remote signaling and remote measuring signals into digital quantities through the A/D conversion module and transmits the digital quantities to the main control unit;
the main control unit central processing unit collects alternating voltage quantity of the ring main unit PT cabinet and divides the alternating voltage quantity into areas to process information, and the communication module receives data uploaded by the digital sensing unit to complete synchronization;
analyzing the synchronized digital telemetry data, when a line short circuit or a ground fault occurs, the voltage and the current of the line are suddenly changed, calculating the voltage and the current of the line by a half-wave method and a transient characteristic method, judging the fault type and the protection action range according to the size, the time and the direction of the fault characteristic quantity exceeding a protection fixed value, and when the fault is judged to be in a region, not recovering the power supply in the region; and when the fault is judged to be out of the area, switching on the area to supply power or recovering the power by switching the contact switch to the supply mode.
The invention discloses a station terminal with a digital architecture, which comprises a digital main control unit and a digital sensing unit, wherein the station terminal is arranged in a ring network box or an switching station of a 10kV distribution network cable line, can finish the 'observability, the measurability and the controllability' of the 10kV line, and achieves the accurate research and judgment of the short circuit and the grounding fault of the line, the fault isolation and the power supply restoration of a non-fault area through the logic of the station terminal with the digital architecture. The invention can improve the reliability of the station terminal in severe environment, improve the anti-interference capability of signal transmission and improve the accuracy of fault time; under the double-carbon policy, the digital architecture can reduce the use length and the number of cables in the ring main unit or the switching station, thereby reducing the use of copper materials, taking the ring main unit of the centralized station terminal with 2 in and 4 out as an example, the use amount of the cables is reduced by 30 percent, and the number of the domestic ring main units is numerous, so the popularization of the station terminal of the digital architecture can open up a low-carbon route for medium-voltage distribution networks.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A station terminal with a digital architecture is characterized by comprising a PT cabinet, an incoming and outgoing line cabinet,
The main control unit and the digital sensing unit;
the main control unit is used for collecting alternating voltage in the PT cabinet, receiving remote measurement and remote signaling digital signals converted by the digital sensing unit, performing logic operation after synchronization, and sending parameters and instructions to the digital sensing unit through a digital channel;
the digital sensing unit is used for collecting signals such as alternating current quantity, remote signaling and state of the ring main unit incoming and outgoing line cabinet, converting the signals into digital quantity and transmitting the digital quantity to the main control unit; receiving an instruction of the main control unit, and performing remote control operation and state display of the line inlet and outlet cabinet; the local opening and closing operation of the local wire inlet and outlet cabinet is completed;
the main control unit is connected with the digital sensing unit through a digital bus.
2. The station terminal of the digital architecture according to claim 1, wherein the main control unit comprises a first communication module, a central processing unit, a line loss module and a fault analysis module, the central processing unit adopts a domestic cpu+a large-scale programmable logic array FPGA to partition the central processing unit, the first communication module is analyzed and controlled by a region of the central processing unit responsible for a communication module process, the line loss module is analyzed and calculated by a region of the central processing unit responsible for a line loss module process, and the fault analysis module is analyzed and calculated by a region of the central processing unit responsible for a fault analysis module process.
3. The station terminal of claim 2, wherein the first communication module is configured to receive the converted current and the digital signals such as the remote signaling and the status from the digital sensing unit, and to send the parameters and the commands to the digital sensing unit.
4. A station terminal of a digital architecture according to claim 3, wherein the line loss module calculates the electric energy and the line loss pulse according to the acquired data after synchronization of the ac voltage in the PT cabinet and the ac current in the compartment of the outlet cabinet.
5. The station terminal of claim 4, wherein the fault analysis module is configured to determine a fault such as a line short, a ground, etc. by analyzing the synchronized telemetry data, and to restore power to the non-faulty area by logic analysis.
6. The station terminal of claim 2, wherein the main control unit includes a voltage power supply unit for supplying an operating power and an operating power.
7. The station terminal of a digital architecture according to claim 1, wherein the digital sensing unit comprises an acquisition module, an a/D conversion module, a central processing module and a second communication module, and the acquisition module is used for acquiring alternating current quantity and remote signaling signals of the ring main unit incoming and outgoing line cabinet; the A/D conversion module is used for converting the acquired telemetry signals of the ring main unit in-out line cabinet into digital signals; the central processing module is used for receiving an instruction of the main control unit to perform remote control operation and state display of the line inlet and outlet cabinet, completing local opening and closing operation of the line inlet and outlet cabinet, collecting digital quantity of local interval remote measurement and remote signaling and framing according to specifications; the second communication module is used for transmitting the traffic and remote signaling digital signals of the ring main unit incoming and outgoing line cabinet to the main control unit.
8. The station terminal of claim 4, wherein the central processing module is further connected with a liquid crystal display module through a serial port; the central processing module is also connected with an indicator light module, and the indicator light module comprises indicator lights which are respectively matched with the control loops correspondingly;
and the control panel is also provided with a plurality of opening and closing buttons, and each opening and closing button is respectively connected with a corresponding loop controller and correspondingly controls the on-off of one control loop.
9. The station terminal of claim 1, wherein the master control unit and the digital sensing unit are connected by a BiFT3 bus.
10. A station terminal fault judging method of a digital architecture is characterized by comprising the following steps:
the digital sensing unit collects remote signaling and remote measuring signals of the ring main unit incoming and outgoing line cabinet, converts the remote signaling and remote measuring signals into digital quantities through the A/D conversion module and transmits the digital quantities to the main control unit;
the main control unit central processing unit collects alternating voltage quantity of the ring main unit PT cabinet and divides the alternating voltage quantity into areas to process information, and the communication module receives data uploaded by the digital sensing unit to complete synchronization;
analyzing the synchronized digital telemetry data, when a line short circuit or a ground fault occurs, the voltage and the current of the line are suddenly changed, calculating the voltage and the current of the line by a half-wave method and a transient characteristic method, judging the fault type and the protection action range according to the size, the time and the direction of the fault characteristic quantity exceeding a protection fixed value, and when the fault is judged to be in a region, not recovering the power supply in the region; and when the fault is judged to be out of the area, switching on the area to supply power or recovering the power by switching the contact switch to the supply mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211629330.8A CN116032005A (en) | 2022-12-19 | 2022-12-19 | Station terminal with digital architecture and fault discrimination method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211629330.8A CN116032005A (en) | 2022-12-19 | 2022-12-19 | Station terminal with digital architecture and fault discrimination method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20130262922A1 (en) * | 2012-03-27 | 2013-10-03 | State Grid Corporation Of China | Centralized and networked protection system and method of a regional distribution network |
| CN103983901A (en) * | 2014-05-30 | 2014-08-13 | 智友光电技术发展有限公司 | Online failure positioning method for ring main unit cable line |
| CN110797978A (en) * | 2019-10-31 | 2020-02-14 | 国网河北省电力有限公司电力科学研究院 | Intelligent station terminal with edge computing capability and fault judgment method |
| CN113013993A (en) * | 2021-04-25 | 2021-06-22 | 南京芯橙电力科技有限公司 | Digital primary and secondary fusion ring net cage complete system |
| CN217467067U (en) * | 2022-02-24 | 2022-09-20 | 国网安徽省电力有限公司马鞍山供电公司 | Single-phase earth fault line selection device of looped netowrk cabinet |
-
2022
- 2022-12-19 CN CN202211629330.8A patent/CN116032005A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130262922A1 (en) * | 2012-03-27 | 2013-10-03 | State Grid Corporation Of China | Centralized and networked protection system and method of a regional distribution network |
| CN103983901A (en) * | 2014-05-30 | 2014-08-13 | 智友光电技术发展有限公司 | Online failure positioning method for ring main unit cable line |
| CN110797978A (en) * | 2019-10-31 | 2020-02-14 | 国网河北省电力有限公司电力科学研究院 | Intelligent station terminal with edge computing capability and fault judgment method |
| CN113013993A (en) * | 2021-04-25 | 2021-06-22 | 南京芯橙电力科技有限公司 | Digital primary and secondary fusion ring net cage complete system |
| CN217467067U (en) * | 2022-02-24 | 2022-09-20 | 国网安徽省电力有限公司马鞍山供电公司 | Single-phase earth fault line selection device of looped netowrk cabinet |
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