CN111244902A - Ring main unit protection system and protection method with mutual standby function - Google Patents
Ring main unit protection system and protection method with mutual standby function Download PDFInfo
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- CN111244902A CN111244902A CN202010170427.1A CN202010170427A CN111244902A CN 111244902 A CN111244902 A CN 111244902A CN 202010170427 A CN202010170427 A CN 202010170427A CN 111244902 A CN111244902 A CN 111244902A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
Abstract
The invention provides a ring main unit protection system with mutual standby function and a protection method, which mainly comprises an even number of interval unit protection devices arranged in a ring main unit, wherein the interval units and the protection devices are grouped pairwise, a main program and a standby program are stored in the interval unit protection devices of the ring main unit, the main program is used for monitoring 1 line administered by each interval unit and providing protection for the interval units when the grouping works normally, and the standby program is used for monitoring two lines in the grouping and providing protection for the two interval units when one interval unit in the grouping is abnormal or has a fault.
Description
Technical Field
The invention relates to a power distribution network line device and a protection mode thereof, in particular to a ring main unit with mutual standby function and a protection method.
Background
The ring main unit is widely applied to important nodes of a cable network, is used as important segmentation, contact, boundary and branch nodes of a main line of a power distribution network, and plays roles in monitoring operation of a power distribution network line and quickly judging, positioning, isolating and recovering power supply of a fault line. The ring main unit consists of a ring inlet and ring outlet unit, a feeder unit, a bus PT (potential transformer) unit and protection devices arranged on each interval unit, wherein the protection devices of each interval unit are responsible for the functions of measurement, control, relay protection, communication and the like of each interval unit, and at present, the protection devices of each interval unit are mutually independent and do not have electrical interaction and information interaction. When a protection device at an interval of the ring main unit breaks down, the functions of measurement, protection, control and the like at the interval can be completely paralyzed, and the current processing method comprises the following steps:
1. the line is continuously operated, but the line has no measurement, no protection and no remote control, and when the line breaks down, the fault cannot be monitored and isolated, so that the fault is easily expanded, and the safety of power supply is seriously influenced.
2. The protection device is replaced or maintained after power failure for several hours, so that the reliability of power supply is greatly influenced.
Therefore, the existing protection device has no standby capability, and the failure or the abnormality of the protection device can cause that the managed line has no monitoring and protection functions, thereby greatly influencing the safety and the reliability of power supply.
The invention provides a ring main unit protection system with mutual standby function and a protection method thereof. When having realized that a certain protection device breaks down on the looped netowrk cabinet, not having changed line structure, need not to change or overhaul protection device, need not to have a power failure, whole looped netowrk cabinet can continue normal operating's function, has improved the security and the reliability of power supply greatly.
Disclosure of Invention
The invention provides a ring main unit protection system with mutual standby function, which comprises the following specific schemes:
the utility model provides a looped netowrk cabinet protection system with mutual standby function, looped netowrk cabinet protection system includes a plurality of interval unit protection device, interval unit one-to-one in interval unit protection device and the looped netowrk cabinet, its characterized in that:
each interval unit protection device is stored with a main program and a standby program, wherein the main program is used for monitoring and reporting own electrical data and protecting own circuit; the standby program is used for simultaneously monitoring and reporting the electrical data of the two interval units in the grouping and protecting the two lines;
when the ring main unit protection system works, every two interval unit protection devices form a grouping, when the grouping works normally, each interval unit protection device only starts a main program, and when one interval unit protection device in the grouping breaks down, the other interval unit protection device which works normally automatically starts a standby program.
Furthermore, in each grouping, two interval unit protection devices independently use a three-phase current transformer to monitor current data input into the interval units, and the current data acquired by the two interval unit protection devices are simultaneously sent to the two interval unit protection devices; the two interval unit protection devices share one three-phase voltage transformer to monitor and input bus voltage data of the interval units, and the collected voltage data is simultaneously transmitted to the two interval unit protection devices.
Furthermore, in each grouping, each interval unit protection device simultaneously acquires two ring main unit switch opening state signals and two ring main unit switch closing state signals in the grouping respectively.
Furthermore, the interval unit protection device realizes the collection of the switch opening state and the switch closing state through optical coupling isolation.
Furthermore, in each grouping, each interval unit protection device is respectively and simultaneously connected with the open terminals of the two interval unit switches, and can simultaneously control the opening and closing signals of the two interval units.
Furthermore, the interval unit protection device is provided with a remote communication network port, and the remote communication network port is used for reporting the electrical data of the interval unit to the remote master station system and receiving various instructions sent by the remote master station system.
Furthermore, a self-checking network port is arranged on the interval unit protection devices and used for transmitting fault signals between the two interval unit protection devices in the marshalling.
Furthermore, signals acquired by the three-phase current transformer and the three-phase voltage transformer are adjusted by the overvoltage protection module, the signal conditioning module and the high-speed A/D conversion module and then are sent to a CPU on the compartment unit protection device, and the CPU is a logic judgment unit for judging whether the working state of the compartment unit protection device is normal or not.
Further, the judgment condition of the logic judgment unit can be rewritten according to the line requirement.
The invention also provides a ring main unit protection method with mutual standby function, and the specific scheme is as follows:
a ring main unit protection method with mutual standby function is characterized by comprising the following steps:
s1: a main program and a standby program are built in an interval unit protection device of the ring main unit;
s2: grouping every two interval unit protection devices in the ring main unit, and establishing a fault signal transmission channel between the two interval unit protection devices in the grouping;
s3: when the ring main unit works normally, each interval unit protection device only runs a main program, monitors the electrical data of the line of the interval unit protection device and provides protection for the line of the interval unit protection device; when an interval unit in the ring main unit breaks down, a protection device corresponding to the interval unit sends a fault signal to another interval unit protection device in the marshalling through a fault signal transmission channel, a main program of the other interval unit protection device is closed, a standby program is started, and meanwhile electrical data of two lines in the marshalling are monitored and the two lines are protected.
S4: when the ring main unit is restored to be normal through field maintenance or overhaul, the interval unit protection device which is restored to be normal sends a fault restoration signal to another interval unit protection device in the marshalling through a fault signal transmission channel, a standby program of the other interval unit protection device is closed, a main program is started, and the normal working condition of the ring main unit is restored.
By using the ring main unit protection system and the ring main unit protection method, the defects that no information interaction exists or the information interaction capability is weak and power failure maintenance is needed after a fault occurs in a traditional power distribution network line when the ring main unit is used can be overcome, and the safety and the reliability of power supply are improved.
Drawings
FIG. 1 is a block diagram of one embodiment of the present invention;
FIG. 2 is a schematic diagram of a bay unit protection device in an embodiment of the invention;
FIG. 3 is a schematic diagram of a consist in one embodiment of the invention.
Wherein, 1 is looped netowrk cabinet, 2 is interval unit protection device, 3 is three-phase voltage transformer, 4 are three-phase current transformer, 5 are three-phase voltage acquisition transmission cables, 6 are three-phase current acquisition transmission cables, 7 are state and control acquisition transmission cables, 8 are the mutual net mouth of self-checking signal.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, in an embodiment of the present invention, a ring inlet and outlet unit, a feed-out unit and a PT unit are installed in a ring main unit, a vacuum interrupter is equipped with a fully insulated and fully sealed stainless steel housing, a vacuum circuit breaker is installed inside, and a partition unit protection device having a mutual standby function is installed in a secondary chamber. The automatic control structure is composed of a main control board, a liquid crystal display screen, an operation key, an indicator light, a self-checking network port, a remote communication network port, a wiring terminal and the like.
In this embodiment, there are 6 spacing units and corresponding protection devices, and each of the 6 spacing units and the corresponding protection devices are grouped into two groups to form 3 groups that are mutually standby. The electrical connections are identical in each group, and the structure and function of one group will be described in detail below.
The three-phase voltage transformer is arranged inside the ring main unit, A, B, C three-phase voltage signals in a power supply line are collected in real time, and the three-phase voltage transformer is connected with the interval unit protection device through a three-phase voltage collecting and transmitting cable. The three-phase voltage transformer is characterized in that the acquisition bandwidth is 0-4 khz, and the precision is 1%. The three-phase voltage acquisition transmission cable is a coaxial cable and transmits voltage signals acquired by the three-phase voltage transformer in real time.
The three-phase current transformer is arranged inside the ring main unit, A, B, C three-phase current signals in each interval unit loop are collected in real time, and the three-phase current transformers are respectively connected with two interval unit protection devices in each marshalling through three-phase current collecting and transmitting cables. The sampling bandwidth is 0-4 khz, and the precision is 0.5%. A plurality of three-phase current transformers are arranged in one ring main unit. The three-phase current acquisition transmission cable is a coaxial cable and transmits voltage signals acquired by the three-phase current transformer in real time.
The status and control transmission cable is a coaxial cable, and status signals are transmitted between the two interval unit protection devices of each grouping in real time. Meanwhile, the interval unit protection device transmits the opening and closing control signal through the state and control transmission cable.
In each marshalling, two interval unit protection devices with mutual standby functions are respectively provided with a self-checking network port, and the self-checking network port is an RJ45 network port and is used for interacting self-checking signals. When one protection device is in fault or abnormal, the other interval unit protection device in normal operation in the grouping receives a fault signal sent by the fault interval unit protection device through the self-checking network port, and a standby program is started. In this case, all signal acquisition, protection and communication functions of the line governed by the faulty or abnormal bay unit protection device are undertaken by the normally operating bay unit protection devices in the consist. Namely, the normally working compartment unit protection device undertakes the functions of acquisition, protection and communication of the electrical appliance signals of the two lines in the grouping.
Each interval unit protection device is provided with a remote communication network port. And the remote communication network port is used for uploading the line signals acquired by the interval unit protection device to the remote master station system and receiving various instructions sent by the remote master station system. The remote communication network port is an RJ45 network port.
In each isolation unit protection device with a mutual standby function, two sets of programs are stored: the 1 st set is a main program, namely a program which runs under the normal condition of the protection device and is only responsible for the functions of data acquisition, protection, communication and the like of the interval unit; the 2 nd set is a standby program, namely when the adjacent protection device has a fault, the main program is switched to the standby program, and the standby program is responsible for the functions of data acquisition, protection, communication and the like of the interval unit and the adjacent interval unit.
When a power grid maintainer restores the protection device with a fault or an abnormal condition to be normal through field maintenance or overhaul, the adjacent protection devices exchange information through a self-checking network port, automatically start a main program, close a standby program and restore the main program to a normal working state respectively.
Fig. 2 shows the principle and the connection of a compartment protection arrangement. As shown in fig. 2, in each bay unit protection device, a DSC chip of STM32f407VG is used as a logic determination CPU, and it is responsible for determining the operating state of the bay unit protection device according to the voltage and current parameters of the managed line. And if the working state is normal, starting a main program in the interval unit protection device to work, and reporting the working state and the electrical parameters of the line to the remote master station through the remote communication network port. And if the working state is a fault, starting a standby program in the interval unit protection device to work, and reporting the working state and the electric parameters of the line to the remote main station through the remote communication network port.
In this embodiment, the parameters input to the CPU include the three-phase current transformer signals of the line governed by this spacing unit, the three-phase current transformer signals of the line governed by the adjacent units in the consist, and the bus three-phase voltage transformer signals. Before the three groups of signals are input into the CPU, the signals are processed by an overvoltage protection module, a signal conditioning module and a high-speed A/D conversion module in sequence. The overvoltage protection module adopts a 12V/5A voltage-stabilized power supply, the voltage stabilization part adopts a 7805 three-terminal voltage stabilizer which is additionally connected with a current-expanding triode, and the adjusting end potential of the overvoltage protection module is raised by the series voltage drop of a voltage-stabilizing diode and a light-emitting diode. The overvoltage protection adopts a mode of a silicon controlled short-circuit power supply to force the fuse to be rapidly fused so as to protect the safety of a later-stage circuit. The signal conditioning module has the functions of: converting the collected +/-3-5V voltage signal into a +/-2-3 mA current signal. The high-speed A/D sampling module is an AD9252 chip.
In this embodiment, the CPU of each bay unit protection device is further isolated by a TLP112 optocoupler, so as to safely collect the opening state signal and the closing state signal of the own bay unit protection device and the adjacent bay unit protection devices, and determine the transmission destination of the contact and the state signal according to the working state of the own bay unit.
Fig. 3 shows the principle and connection of two bay units protection devices in a consist. In the other two groups of the embodiment, the principle and the connection relationship of the two interval unit protection devices are the same as those of the group.
The 1-interval unit protection device comprises: two groups of three-phase current transformer signal terminals Ia1, Ib1, Ic1, In1, Ia2 ', Ib 2', Ic2 'and In 2'; a group of three-phase voltage transformer signal terminals Ua, Ub, Uc and Un; 1-interval cell switch open state signal terminal Rf 1; 1 interval unit switch closing state signal terminal Rh 1; 2-interval cell switch open state signal terminal Rf 2; 2 interval unit switch closing state signal terminal Rh 2; a 1-interval cell opening amount terminal Of 1; a 1-interval unit closing opening amount terminal Oh 1; a 2-interval cell opening output terminal Of 2; the 2-interval unit closes the opening terminal Oh 2.
The 2-interval unit protection device is provided with: two groups of three-phase current transformer signal terminals Ia2, Ib2, Ic2, In2, Ia1 ', Ib 1', Ic1 'and In 1'; a group of three-phase voltage transformer signal terminals Ua, Ub, Uc and Un; 2-interval cell switch open state signal terminal Rf 2; 2 interval unit switch closing state signal terminal Rh 2; 1-interval cell switch open state signal terminal Rf 1; 1 interval unit switch closing state signal terminal Rh 1; 2-interval cell opening output terminal Of 2'; 2-interval unit closing output terminal Oh 2'; 1-interval cell opening output terminal Of 1'; the 1-interval unit closes the opening amount terminal Oh 1'.
In this example, Ia1 was In series with Ia1 ', Ib1 was In series with Ib 1', Ic1 was In series with Ic1 ', and In1 was In series with In 1'; ia2 was In series with Ia2 ', Ib2 was In series with Ib 2', Ic2 was In series with Ic2 ', and In2 was In series with In 2'. In the above connection mode, the protection device of the 1-interval unit simultaneously acquires the three-phase current signal of the 1-interval unit and the three-phase current signal of the 2-interval unit through the terminal series connection, and the protection device of the 2-interval unit simultaneously acquires the three-phase current signal of the 2-interval unit and the three-phase current signal of the 1-interval unit through the terminal series connection. The 1-interval unit protection device and the 2-interval unit protection device respectively acquire three-phase voltage signals of the same voltage transformer, namely Ua, Ub and Uc.
Rf1 is connected with Rf2 in parallel, and Rh1 is connected with Rh2 in parallel. In the above connection mode, the 1-interval unit protection device simultaneously acquires the switching-off and switching-on state signals of the 1-interval unit and the 2-interval unit through the parallel connection of the terminals, and the 2-interval unit protection device simultaneously acquires the switching-off and switching-on state signals of the 2-interval unit and the 1-interval unit through the parallel connection of the terminals.
Of1, Oh1, Of2 and Oh2 are connected to the 1-compartment protection device, and Of1 ', Oh 1', Of2 'and Oh 2' are connected to the 2-compartment protection device. In the above connection mode, the 1-interval unit protection device can simultaneously control the opening and closing of the 1-interval unit switch and the 2-interval unit switch, and the 2-interval unit protection device can simultaneously control the opening and closing of the 2-interval unit switch and the 1-interval unit switch.
The 1-interval unit protection device self-checking network port and the 2-interval unit protection device self-checking network port are connected through network cables and exchange information with each other, when the 1-interval unit protection device self-checks that the self-checking network port fails or is abnormal, the failure or abnormal information is sent to the 2-interval unit protection device, the 2-interval unit protection device starts a standby program, and all original functions of the 1-interval unit protection device are realized by the 2-interval unit protection device. On the contrary, when the protection device of the 2-interval unit detects that the protection device of the 2-interval unit has a fault or an abnormality, the fault or the abnormality information is sent to the protection device of the 1-interval unit, the protection device of the 1-interval unit starts a standby program, and all original functions of the protection device of the 2-interval unit are realized by the protection device of the 1-interval unit.
The remote communication network port sends information to the remote main station system for the protection device at each interval, and receives various instructions of the remote main station system.
When the line condition of the ring main unit in this embodiment changes, a power grid maintenance worker may issue an instruction to update through the remote main station system, or update the main program and the standby program through other manners, so as to change the judgment condition of the normal working condition of the interval unit.
The analog signal short-distance wireless transmission device provided by the invention is described in detail above, and a specific example is applied in the text to explain the principle and the implementation of the invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and the content of the present specification should not be construed as a limitation to the technical solution of the present invention.
Claims (10)
1. The utility model provides a looped netowrk cabinet protection system with mutual standby function, looped netowrk cabinet protection system includes a plurality of interval unit protection device, interval unit one-to-one in interval unit protection device and the looped netowrk cabinet, its characterized in that:
each interval unit protection device is stored with a main program and a standby program, wherein the main program is used for monitoring and reporting own electrical data and protecting own circuit; the standby program is used for simultaneously monitoring and reporting the electrical data of the two interval units in the grouping and protecting the two lines;
when the ring main unit protection system works, every two interval unit protection devices form a grouping, when the grouping works normally, each interval unit protection device only starts a main program, and when one interval unit protection device in the grouping breaks down, the other interval unit protection device which works normally automatically starts a standby program.
2. The ring main unit protection system according to claim 1, wherein in each of the groups, two bay unit protection devices each independently use a three-phase current transformer to monitor current data input to the bay units, and send the current data collected by each to the two bay unit protection devices at the same time; the two interval unit protection devices share one three-phase voltage transformer to monitor and input bus voltage data of the interval units, and the collected voltage data is simultaneously transmitted to the two interval unit protection devices.
3. The ring main unit protection system according to claim 1, wherein in each of the groups, each inter-bay unit protection device simultaneously collects two ring main unit switch opening status signals and two ring main unit switch closing status signals in the group.
4. The ring main unit protection system according to claim 3, wherein the interval unit protection device collects the switch opening state and the switch closing state through optical coupling isolation.
5. The ring main unit protection system according to claim 4, wherein in each of the groups, each of the partition unit protection devices is connected to the open terminals of two partition unit switches at the same time, and can control the opening and closing signals of the two partition units at the same time.
6. The ring main unit as claimed in claim 1, wherein the inter-bay unit protection device is provided with a remote communication port, and the remote communication port is configured to report the electrical data of the inter-bay unit to the remote main station system and receive various instructions from the remote main station system.
7. The ring main unit according to any one of claims 1 to 5, wherein the bay unit protection devices are provided with self-checking network ports for transmitting fault signals between two bay unit protection devices in the marshalling.
8. The ring main unit according to claim 7, wherein the signals collected by the three-phase current transformer and the three-phase voltage transformer are adjusted by an overvoltage protection module, a signal conditioning module and a high-speed A/D conversion module and then sent to a CPU on the compartment unit protection device, and the CPU is a logic judgment unit for judging whether the working state of the compartment unit protection device is normal or not.
9. The ring main unit as claimed in claim 8, wherein the judgment condition of the logic judgment unit can be rewritten according to the line requirement.
10. A ring main unit protection method with mutual standby function is characterized by comprising the following steps:
s1: a main program and a standby program are built in an interval unit protection device of the ring main unit;
s2: grouping every two interval unit protection devices in the ring main unit, and establishing a fault signal transmission channel between the two interval unit protection devices in the grouping;
s3: when the ring main unit works normally, each interval unit protection device only runs a main program, monitors the electrical data of the line of the interval unit protection device and provides protection for the line of the interval unit protection device; when an interval unit in the ring main unit breaks down, a protection device corresponding to the interval unit sends a fault signal to another interval unit protection device in the marshalling through a fault signal transmission channel, a main program of the other interval unit protection device is closed, a standby program is started, and meanwhile electrical data of two lines in the marshalling are monitored and the two lines are protected.
S4: when the ring main unit is restored to be normal through field maintenance or overhaul, the interval unit protection device which is restored to be normal sends a fault restoration signal to another interval unit protection device in the marshalling through a fault signal transmission channel, a standby program of the other interval unit protection device is closed, a main program is started, and the normal working condition of the ring main unit is restored.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010170427.1A CN111244902A (en) | 2020-03-12 | 2020-03-12 | Ring main unit protection system and protection method with mutual standby function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010170427.1A CN111244902A (en) | 2020-03-12 | 2020-03-12 | Ring main unit protection system and protection method with mutual standby function |
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| Publication Number | Publication Date |
|---|---|
| CN111244902A true CN111244902A (en) | 2020-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010170427.1A Pending CN111244902A (en) | 2020-03-12 | 2020-03-12 | Ring main unit protection system and protection method with mutual standby function |
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| Country | Link |
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| CN (1) | CN111244902A (en) |
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2020
- 2020-03-12 CN CN202010170427.1A patent/CN111244902A/en active Pending
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