CN114062973B - In-situ feeder automation reverse locking application method - Google Patents
In-situ feeder automation reverse locking application method Download PDFInfo
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- CN114062973B CN114062973B CN202111228728.6A CN202111228728A CN114062973B CN 114062973 B CN114062973 B CN 114062973B CN 202111228728 A CN202111228728 A CN 202111228728A CN 114062973 B CN114062973 B CN 114062973B
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- 238000011065 in-situ storage Methods 0.000 title claims abstract description 10
- 238000001514 detection method Methods 0.000 claims abstract description 32
- 230000000903 blocking effect Effects 0.000 claims abstract description 6
- 230000006870 function Effects 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 6
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- 238000010586 diagram Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/56—Testing of electric apparatus
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses an in-situ feeder automation reverse locking principle based on hardware detection residual voltage locking and an application method thereof. The invention generates residual voltage (reverse) blocking when the device is powered up and returns to normal operation, prevents the device from closing on permanent faults, improves the reliability of system protection, protects switch equipment, prolongs the service life, solves the problem that the device cannot record the process of instantaneously restoring power supply of the system under the condition that the system fails and the protection device system loses power and the backup power supply loses power, so that the reverse single side is powered on permanent faults after the device returns to an operating state.
Description
Technical Field
The invention relates to the technical field of a method for automatically judging and controlling faults based on a cable line with a distribution terminal DTU (digital television unit) and an overhead line with a FTU (feeder terminal), in particular to an in-situ feeder automation reverse locking principle based on hardware detection residual voltage locking and an application method thereof.
Background
The distribution network plays an important role in the power system of China, has great significance for the development of the power system, has important role in improving the fault processing level of the power distribution network by the application of feeder automation technology in the operation of the power distribution network, monitors the state, current and voltage conditions of all switches of the distribution line in real time under the normal state of a distribution terminal, realizes remote or on-site switching-on and switching-off operation of the line switch, obtains fault records when in fault, can automatically judge and isolate feeder fault sections, and rapidly recovers power supply to non-fault areas.
The method is characterized in that a cable line is adopted to configure a ring main unit in a 10kV hybrid line, a DTU is additionally arranged on an overhead line configuration column, an FTU is additionally arranged on a circuit breaker, a distribution automation system is arranged, the communication channels of the DTU and the FTU of each distribution terminal are connected with a distribution automation main station or a substation system, when the power failure occurs in the line, the main station or the substation positions the failure according to information sent by the distribution terminal through software operation, and automatically sends a remote control command to a switch of the ring main unit so as to achieve the purposes of isolating the failure and recovering power supply.
The principle and the application method thereof are suitable for an in-situ feeder automation system, and can solve the problem that when the system fails, the protection device system loses power and the backup power supply loses power, the device cannot record the process of instantaneously recovering the power supply of the system, so that after the device is recovered to a running state, a single side is powered on to a permanent fault. When the permanent faults are combined, the electric power system can be impacted greatly, the whole system can bear large short-circuit current, the power failure range is enlarged, the reliability of system protection is reduced, meanwhile, the switch is required to cut off the electric arc twice continuously in a short time, the electric arc damage is caused to the switch equipment, and the service life is shortened.
The principle and the application method thereof can effectively solve the problem, under the condition that a device system is in power failure and a backup power supply is in power failure, the instantaneous residual voltage is recorded through hardware, and a locking signal is sent out, so that when the device is in power failure and returns to normal operation, residual voltage (reverse) locking is generated, the device is prevented from being closed on a permanent fault, the reliability of system protection is improved, the switch equipment is also protected, and the service life is prolonged.
In the operation process of the distribution network system, when faults occur between two protection devices, a 10KV feeder line outgoing circuit breaker CB with time limit protection and secondary reclosing functions at the outlet of a transformer substation trips, all devices are disconnected due to voltage loss, after the CB is reclosed for the first time, an upstream device has voltage on one side and fault current memory, delay closing is carried out, a downstream device also can be powered on for a short time, the devices recover to operate, and single-side power on logic is started. If the fault is a permanent fault, the upstream device trips again due to the fault, and if the downstream device is closed electrically on one side, the fault power failure range is widened due to the fault trip. The downstream device undergoes a "no-voltage-residual-no-voltage" process, indicating that the fault is a permanent fault, so residual (reverse) latching logic should be generated to latch the closing, preventing the closing of the fault, and when the downstream device is de-energized and the backup power source is running, the device can detect residual voltage in the process, thereby generating residual (reverse) latching logic to latch the closing. However, if the downstream device is powered down and the backup power supply is powered down, the device is in a non-running state, the software cannot detect the instantaneous residual voltage, and the residual voltage (reverse) blocking cannot be generated, and if the time is enough after the device is powered on one side again after the voltage is zero-residual voltage-zero, the power on switching-on logic is started and the switching-on is failed, so that a larger safety problem is generated.
Disclosure of Invention
The invention aims to provide an on-site feeder automation reverse locking principle based on hardware detection residual voltage locking and an application method thereof, which have the advantage of high reliability, and solve the problems that when a system fails and a protection device system loses power and a backup power supply loses power, the device cannot record the instantaneous power supply recovery process of the system, so that after the device recovers an operating state, a single side is electrically connected with a permanent fault, the permanent fault causes great impact on a power system, the whole system bears great short-circuit current, the power failure range is enlarged, the reliability of system protection is reduced, and meanwhile, because the switch needs to continuously cut off the arc twice in a short time, the arc damage is caused to switch equipment, and the service life is shortened.
In order to achieve the above purpose, the present invention provides the following technical solutions: the in-situ feeder automation reverse locking principle based on hardware detection residual voltage locking and the application method thereof comprise a hardware detection residual voltage locking module and a software application method, wherein the hardware detection residual voltage locking module consists of a power module, a sampling module, a signal locking module and a signal resetting module, and the software application method consists of an entry acquisition module, a signal resetting module, a signal locking module, a protection logic processing module and the like.
Preferably, the software application method is realized based on a hardware detection residual voltage locking module.
Preferably, the power module, the sampling module, the signal locking module and the signal resetting module are combined into a hardware detection residual voltage locking module, so that the residual voltage detection application function can be completed.
Preferably, the reverse locking principle software is functionally separated into an acquisition module, a signal resetting module, a signal locking module and a protection logic processing module.
Preferably, the hardware detection residual voltage locking module inputs the result into reverse locking principle software to complete the corresponding reverse locking function.
Preferably, the reverse blocking principle software generates residual voltage (reverse) blocking closing and participates in self-adaptive on-site feeder automation logic.
Preferably, the principle and the application method thereof can be applied to distribution terminals DTU and FTU in a power distribution network and other distribution terminals with similar functions.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, under the condition that the system of the device is powered off and the backup power supply is powered off, the instantaneous residual voltage is recorded through hardware, and a locking signal is sent out, so that when the device is powered on and returns to normal operation, residual voltage (reverse) locking is generated, the device is prevented from being switched on to a permanent fault, the reliability of system protection is improved, the switching equipment is also protected, the service life is prolonged, the problem that when the system is powered off and the backup power supply is powered off, the device cannot record the process of instantaneously recovering the power supply of the system, so that after the device is in a running state, the problem that one side is powered on to the permanent fault is caused, the whole system bears a large short-circuit current, the power failure range is enlarged, the reliability of system protection is reduced, and meanwhile, because the switch is required to cut off the arc twice continuously in a short time, the problem of arc damage to the switching equipment is solved, and the service life is shortened.
Drawings
FIG. 1 is a schematic diagram of a distribution network system failure according to the present invention;
FIG. 2 is a block diagram of the residual voltage lockout module hardware of the present invention;
FIG. 3 is a schematic diagram of a residual pressure lock module according to the present invention;
FIG. 4 is a reverse latch logic diagram of the present invention;
fig. 5 is a schematic diagram of a system fault of the reverse latching and closing after the latching of the hardware residual voltage.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
Referring to fig. 1-5, the present invention provides a technical solution: the in-situ feeder automation reverse locking principle based on hardware detection residual voltage locking and the application method thereof comprise a hardware detection residual voltage locking module and a software application method, wherein the hardware detection residual voltage locking module consists of a power module, a sampling module, a signal locking module and a signal resetting module, and the software application method consists of an entry acquisition module, a signal resetting module, a signal locking module, a protection logic processing module and the like.
In the invention, the following components are added: the software application method is realized based on a hardware detection residual voltage locking module.
In the invention, the following components are added: the power module, the sampling module, the signal locking module and the signal resetting module are combined into a hardware detection residual voltage locking module, so that the residual voltage detection application function can be completed.
In the invention, the following components are added: the reverse locking principle software is divided into an acquisition module, a signal resetting module, a signal locking module and a protection logic processing module according to functions.
In the invention, the following components are added: the principle and the application method thereof can be applied to distribution terminals DTU and FTU in a power distribution network and other distribution terminals with similar functions.
Examples
In the invention, the following components are added: the hardware detection residual voltage locking module inputs the result into reverse locking principle software to complete the corresponding reverse locking function.
An automatic reverse locking principle of an in-situ feeder based on hardware detection residual voltage locking and an application method thereof, comprising the following steps:
step one: under the condition that the device is powered off and the backup power supply is powered off, the upstream or downstream equipment briefly resumes power supply, and the hardware of the equipment detects residual voltage and the residual voltage locking module detects residual voltage and drives the corresponding relay to generate a power supply side or load side residual voltage locking signal.
Step two: after the device resumes the power supply, in the running state, input the residual voltage blocking signal in step one to the input signal of the automatic protection logic of the local feeder at the same time;
step three: the in-situ feeder automation software program applies the residual voltage locking signal to the protection logic, and generates residual voltage (reverse) locking closing according to the corresponding protection logic to prevent the device from closing on permanent faults.
Step four: the software program simultaneously sends out a residual voltage locking reset signal to the hardware detection residual voltage locking module, clears the corresponding residual voltage locking signal and enters the software identification residual voltage locking logic.
Step five: the software program simultaneously sends a locking prohibition signal to the hardware detection residual voltage locking module, so that the situation that the hardware detection residual voltage locking module generates a residual voltage locking signal by mistake when the hardware detection residual voltage locking module operates normally is prevented, and the device is locked by mistake, so that normal closing is refused.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The electrical components are all connected with an external main controller and 220V mains supply, and the main controller can be conventional known equipment for controlling a computer and the like.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. The on-site feeder automation reverse locking application method based on the hardware detection residual voltage locking comprises a hardware detection residual voltage locking module and a software application method, and is characterized in that the hardware detection residual voltage locking module consists of a power module, a sampling module, a signal locking module and a signal resetting module, the software application method consists of an on-off acquisition module, a signal resetting module, a signal locking module and a protection logic processing module, and the software application method is realized based on the hardware detection residual voltage locking module and can complete all application functions of an on-site feeder reverse locking principle of a distribution network protection system;
the method also comprises the following steps:
step one: the method comprises the steps that a power supply module, a sampling module, a signal locking module and a signal resetting module are combined into a hardware detection residual voltage locking module, after a device system is powered off and a backup power supply is powered off, upstream or downstream equipment briefly resumes power supply, the hardware detection residual voltage locking module of the equipment detects residual voltage and drives a corresponding relay to generate a power supply side or load side residual voltage locking signal;
step two: after the device resumes the power supply, in the running state, input the residual voltage blocking signal in step one to the input signal of the automatic protection logic of the local feeder at the same time;
step three: the in-situ feeder automation software program applies the residual voltage locking signal to the protection logic, and generates residual voltage reverse locking and closing according to the corresponding protection logic to prevent the device from closing on permanent faults;
step four: the software program simultaneously sends out a residual voltage locking reset signal to the hardware detection residual voltage locking module, clears the corresponding residual voltage locking signal and enters the software identification residual voltage locking logic;
step five: the software program simultaneously sends a locking prohibition signal to the hardware detection residual voltage locking module, so that the situation that the hardware detection residual voltage locking module generates a residual voltage locking signal by mistake when the hardware detection residual voltage locking module operates normally is prevented, and the device is locked by mistake, so that normal closing is refused.
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| CN116316487B (en) * | 2023-05-12 | 2023-10-27 | 珠海许继电气有限公司 | Fault self-healing method and system for distribution line |
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2021
- 2021-10-21 CN CN202111228728.6A patent/CN114062973B/en active Active
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| WO2010075690A1 (en) * | 2008-12-31 | 2010-07-08 | 广东省电力设计研究院 | Electronic switch control module of nuclear power plant |
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