CN111711276A - Distribution automation intelligence feeder terminal - Google Patents

Distribution automation intelligence feeder terminal Download PDF

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Publication number
CN111711276A
CN111711276A CN202010715791.1A CN202010715791A CN111711276A CN 111711276 A CN111711276 A CN 111711276A CN 202010715791 A CN202010715791 A CN 202010715791A CN 111711276 A CN111711276 A CN 111711276A
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China
Prior art keywords
time
module
closing
protection
voltage
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Granted
Application number
CN202010715791.1A
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Chinese (zh)
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CN111711276B (en
Inventor
杨辉
李忠明
王梦胜
邢小双
练盛雄
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ZHUHAI COMKING ELECTRIC CO Ltd
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ZHUHAI COMKING ELECTRIC CO Ltd
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Priority to CN202010715791.1A priority Critical patent/CN111711276B/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/06—Details with automatic reconnection
    • H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
    • 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
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
    • H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
    • H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/16—Electric power substations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The invention relates to a distribution automation intelligent feeder terminal, which consists of at least one FTU (feeder terminal Unit), wherein the feeder terminal comprises a relay protection module, an automatic distribution module and an out-of-limit warning module, and the relay protection module is provided with quick-break protection, overcurrent accelerated protection, zero sequence protection and triple reclosing; the automatic power distribution module is provided with a delayed forward/backward feeding module, a looped network point delayed closing module, a voltage-loss brake separating module and a closed loop; the out-of-limit warning module comprises current out-of-limit warning, overvoltage warning and low-voltage warning, the automatic intelligent feeder line terminal is modularized, extensible and low-power-consumption, has high reliability and adaptability, is suitable for multi-loop centralized monitoring application occasions such as a distribution room, a ring main unit, a switching station and a box-type substation, has fault detection and fault discrimination functions, can upload fault warning information, can automatically reset abnormity, and has a safety protection function of real-time control and parameter setting.

Description

Distribution automation intelligence feeder terminal
Technical Field
The invention relates to the technical field of distribution automation, in particular to an intelligent feeder terminal for distribution automation.
Background
The Feeder Terminal (FTU) is an interface for connecting an automation system and primary equipment, is mainly used for monitoring and controlling a distribution system transformer, a circuit breaker, a recloser, a sectionalizer, a pole-mounted load switch, a ring main unit, a voltage regulator and a reactive compensation capacitor, is communicated with a feeder main station, provides data required by operation control and management of the distribution system, and executes a control and regulation instruction for the distribution equipment given by the main station so as to realize various functions of feeder automation. The Feeder Terminal (FTU) is arranged on a distribution room or a feeder and comprises a switch operation control circuit, an uninterrupted power supply, a feeder automation controller (measurement and control module), a communication interface terminal (communication module) and a control box body, wherein the FTU has the functions of remote control, remote measurement, remote signaling and fault detection, can be communicated with a distribution automation main station, provides the running condition of a distribution system and various parameters, namely information required by monitoring and controlling, including on-off state, electric energy parameters, phase-to-phase faults, grounding faults and parameters during faults, executes commands issued by the distribution main station, adjusts and controls distribution equipment, and realizes the functions of fault positioning, fault isolation, quick recovery of power supply in a non-fault area and the like.
With the development of social economy, the demands of enterprises, residents and other loads on power supply reliability are continuously improved, and the automatic transformation of distribution network lines and the application of feeder automation functions are important means for improving the distribution reliability. The traditional automatic feeder terminal mainly depends on a power distribution terminal to control one-time switch to complete FA logic, but due to the reasons of switch type, protection realization cooperation and the like, the configuration modes of application departments are different in actual production, so that the adaptability of the feeder terminal is poor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides an intelligent power distribution automation feeder terminal and solves the problem of adaptability of the feeder terminal in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows: a distribution automation intelligent feeder terminal comprises at least one FTU (feeder terminal Unit), wherein the feeder terminal comprises a relay protection module, an automatic distribution module and an out-of-limit warning module, and the relay protection module is provided with quick-break protection, overcurrent accelerated protection, zero-sequence protection and triple reclosing; the automatic power distribution module is provided with a delayed forward/backward feeding module, a looped network point delayed closing module, a voltage-loss brake separating module and a closed loop; the out-of-limit warning module includes a current out-of-limit warning, an over-voltage warning, and a low-voltage warning;
for a head end FTU, when a switch is in an off position and a locking and closing signal does not exist, if no single-phase grounding characteristic direction memory exists, the head end FTU is closed after the X time, and the X time of the head end FTU is greater than the reclosing charging time at a substation outgoing line switch; if the first-end FTU detects that the single-phase earth fault line selection trips, the first-end FTU is switched on after line selection coincidence time;
for a non-head end FTU, when a switch is in an open position and a closing signal is not locked, if the non-head end FTU detects that a single-phase earth fault or an interphase short circuit fault occurs, the switch is closed after X time when the single-side voltage is recovered; if the FTU detects that no single-phase earth fault or interphase short circuit fault occurs, switching on after S time when the single side recovers to have voltage;
and X is automatic closing, S is self-adaptive long delay, and S time is greater than the sum of all X times of the longest trunk line of the line.
Preferably, the delayed forward/backward transmission module is configured with power-on delayed closing, X time locking, instantaneous pressurized locking, voltage locking at two sides, closing confirmation, Y time locking and zero sequence overvoltage after closing, wherein Y time is the maximum time limit of fault current detected after the section switch is closed; the ring network point time-delay closing module comprises power supply confirmation, time-delay switching, instantaneous pressurization locking and two-side voltage locking; the closing module comprises a closed loop locking and a closed loop closing.
Preferably, the overcurrent acceleration protection is provided with independent acceleration section protection, the overcurrent acceleration protection and/or zero sequence protection can be selectively used, and the post-acceleration opening time is 200 ms.
Preferably, the triple reclosure starting modes include two modes: starting and protection starting are not corresponded, when secondary and third reclosure are switched in, the reclosure discharges after the switch is superposed and does not reach the set superposition times, and the reclosure is switched off again within the locking time limit; if the coincidence occurs after the success time limit is exceeded, it is determined that there is another round of coincidence.
Preferably, after the voltages at two sides of the voltage-loss switching-off module are lower than a set value, the voltage-loss switching-off module performs switching-off after setting time; when the voltage type subsection S function is applied, if no overcurrent exists in Y time after the switch is switched on, the voltage loss and the brake separation are locked, and the voltage loss and the brake separation are reset after the locking time.
Preferably, when a single-phase earth fault occurs in the normal operation of the line, the first-end FTU performs earth line selection according to the single-phase earth characteristic direction, and trips within the line selection tripping time after the line is judged to be the earth fault of the line; if the line is a permanent single-phase earth fault line, the head end FTU trips for the first time in the line selection tripping time of the head end FTU; after the line selection reclosing time is closed, if a single-phase earth fault is detected within Y time after the closing, the single-phase earth fault is immediately tripped through short delay; and if the single-phase earth fault is not detected within Y time after the switch is closed, the trip is not performed.
Preferably, the overcurrent protection is a backup protection of the line, the whole section of the line is protected, and the action time is longer than the quick-break protection time.
Preferably, the closed-loop lock: when the hand is closed or the remote controller is switched on, the closed loop switching-on and switching-off is selected to be locking; closing a loop and closing a switch: when the hand is closed or the remote controller is closed, the loop closing switching is selected as input, if the voltage difference between two sides of the loop point delay closing module is smaller than the loop closing voltage difference, the loop is closed through the loop closing time.
Preferably, zero-sequence overvoltage is combined: and in Y time after the feeder line terminal is switched on, a zero sequence voltage signal is detected, the switch is immediately switched off, and the ground fault is removed.
The invention has the beneficial effects that:
compared with the prior art, the invention realizes
The application discloses automatic intelligent feeder terminal adopts modularization, expanded, low-power consumption design, has high reliability and adaptability, is applicable to multiloop centralized monitoring application occasions such as electricity distribution room, looped netowrk cabinet, switching station, box-type substation, possesses fault detection and fault discrimination function, can upload fault alarm information, but automatic re-setting is unusual, possesses real-time control and parameter setting's safety protection function.
Drawings
The invention is described in further detail below with reference to the figures and the specific embodiments.
Fig. 1 is a logic diagram of quick-break protection of the distribution automation intelligent feeder terminal according to the embodiment;
fig. 2 is an overcurrent protection logic diagram of the distribution automation intelligent feeder terminal of the embodiment;
fig. 3 is a zero sequence protection logic diagram of the distribution automation intelligent feeder terminal according to the embodiment;
fig. 4 is a logic diagram 1 of overcurrent acceleration protection of the distribution automation intelligent feeder terminal according to the embodiment;
fig. 5 is a logic diagram 2 of overcurrent acceleration protection of the distribution automation intelligent feeder terminal according to the embodiment;
fig. 6 is a logic diagram of a triple reclosing action of the distribution automation intelligent feeder terminal according to the embodiment;
fig. 7 is a timing diagram of triple reclosing actions of the distribution automation intelligent feeder terminal according to the embodiment;
fig. 8 is a zero sequence overvoltage logic diagram after closing of the distribution automation intelligent feeder terminal according to the embodiment;
fig. 9 is a voltage-loss switching-off logic diagram of the distribution automation intelligent feeder terminal according to the embodiment;
fig. 10 is a closed loop locking logic diagram of the distribution automation intelligent feeder terminal according to the embodiment;
fig. 11 is a logic diagram of a closed loop and a closed loop of the distribution automation intelligent feeder terminal according to the embodiment;
fig. 12 is a switching logic diagram of the FTU at the head end of the distribution automation intelligent feeder terminal according to this embodiment;
fig. 13 is a logic diagram of the grounding route selection tripping of the first-end FTU of the distribution automation intelligent feeder terminal according to this embodiment;
fig. 14 is a logic diagram of non-head-end FTU grounding/short circuit tripping of the distribution automation intelligent feeder terminal according to the embodiment;
fig. 15 is a logic diagram of the current over-limit of the current off-limit module of the distribution automation intelligent feeder terminal according to the embodiment;
fig. 16 is a logic diagram of the voltage over-limit of the overvoltage module of the distribution automation intelligent feeder terminal according to the embodiment;
fig. 17 is a logic diagram of lower voltage limit of the low voltage module of the distribution automation intelligent feeder terminal according to the embodiment;
fig. 18 is a logic diagram of power-on delay closing of the distribution automation intelligent feeder terminal according to this embodiment;
fig. 19 is a logic diagram of XT time locking of the distribution automation intelligent feeder terminal according to the embodiment;
fig. 20 is a logic diagram of the instant pressurization blocking of the distribution automation intelligent feeder terminal according to the embodiment;
fig. 21 is a logic diagram of voltage locking at two sides of the distribution automation intelligent feeder terminal according to the embodiment;
fig. 22 is a logic diagram of time locking of the distribution automation intelligent feeder terminal according to the embodiment;
fig. 23 is a power supply confirmation logic diagram when the ring network point delay closing is realized by the distribution automation intelligent feeder terminal in this embodiment;
fig. 24 is a logic diagram of delay switching when the ring network point delay switching is realized by the distribution automation intelligent feeder terminal in this embodiment;
fig. 25 is a logic diagram of instantaneous pressurization locking when the ring network point delay closing is realized by the distribution automation intelligent feeder terminal in this embodiment;
fig. 26 is a logic diagram of voltage locking on two sides when the ring network point delay closing is realized by the distribution automation intelligent feeder terminal in this embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The operation logic of the distribution automation intelligent feeder terminal provided by the embodiment of the invention comprises fig. 1-26, and specifically comprises the following steps:
an intelligent feeder terminal for distribution automation is composed of at least two FTUs, the FTUs are divided into a head end FTU and a non-head end FTU according to a connection sequence, the at least two FTUs are connected in parallel through a section point switch and a ring network point switch respectively, the FTUs have a section point function and a ring network point function, the feeder terminal comprises a relay protection module, an automatic distribution module and an out-of-limit warning module, and the relay protection module is configured with quick-break protection, overcurrent accelerated protection, zero-sequence protection and triple reclosing; the automatic power distribution module is provided with a delayed forward/backward feeding module, a looped network point delayed closing module, a voltage-loss brake separating module and a closed loop; the out-of-limit warning module includes a current out-of-limit warning, an over-voltage warning, and a low-voltage warning.
Fig. 12 is a switching logic diagram of the head end FTU for which both PTs of the head end FTU must be mounted on the power supply side. When the switch is in an off position and no closing signal is locked, if no single-phase grounding characteristic direction memory exists, the head end FTU is closed after the X time, and the X time of the head end FTU is longer than the reclosing charging time at the position of a substation outgoing switch; and if the first-end FTU detects that the single-phase earth fault line selection trips, the first-end FTU is switched on after line selection coincidence time.
Fig. 13 is a logic diagram of the ground line selection tripping of the first-end FTU, when a single-phase ground fault occurs during normal operation of the line, the first-end FTU performs ground line selection according to the single-phase ground characteristic direction, and trips within the line selection tripping time after the ground fault of the line is determined; if the line is a permanent single-phase earth fault line, the head end FTU trips for the first time in the line selection tripping time of the head end FTU; after the line selection reclosing time is closed, if a single-phase earth fault is detected within Y time after the closing, the single-phase earth fault is immediately tripped through short delay; and if the single-phase earth fault is not detected within Y time after the switch is closed, the trip is not performed.
Referring to fig. 14, for the non-head-end FTU, when the switch is in the off position and there is no closing signal for locking, if the non-head-end FTU detects that a single-phase ground fault or an inter-phase short circuit fault has occurred, and a voltage is restored on a single side, the closing is completed by powering on after X time; and if the FTU detects that the single-phase earth fault and the interphase short circuit fault do not occur, when the voltage is recovered at the single side, the FTU is electrified and closed after S time to complete closing.
In this embodiment, the power-on switch is marked as 1, X is an automatic switch, S is a self-adaptive long delay, and S time is greater than the sum of all X times of the longest trunk line of the line.
In an embodiment of the present invention, the troubleshooting or processing of the fault or the abnormal condition by the relay protection module includes the following steps:
quick-break protection: fig. 1 is a logic diagram of quick-break protection, which is a main protection of a line, can be set to zero time limit action, and reflects a relatively serious short-circuit fault of the line, In this embodiment, the current of the quick-break protection is 0.02In to 20In, the time is 0s to 10s, and the return coefficient of an excess relay is 0.98. When an electric part in a power grid has a fault, the short-circuit current is very large, and according to the basic action principle of an excess relay, if the short-circuit current can be set into the action current through a preset current setting value, the fault part can be protected. Overcurrent protection and current snap-off protection are realized according to the principle. In order to ensure the selectivity of the action, according to the characteristics of the short-circuit current (the closer the fault point is to the power supply, the larger the short-circuit current is), the overcurrent protection is provided with action time limit, and the current quick-break protection is not provided with action time limit, namely when the short-circuit occurs, the current quick-break protection immediately acts to cut off the fault, so the current quick-break protection has no time limit characteristic and can be used together with the overcurrent protection.
Overcurrent protection: fig. 2 is a logic diagram of the overcurrent protection in the embodiment, the overcurrent protection is a backup protection of the line, the whole section of the line can be protected, the setting action time is relatively fast, and the current constant value is generally set to be the maximum load current value of the line. When the fault current in the circuit reaches the action value (overcurrent constant value) of the excess relay, the overcurrent tripping of the feeder switch is completed after overcurrent delay; when a line fails, if a feeder terminal detects no voltage and no current, a feeder switch trips; if the feeder line terminal detects fault current and the zero voltage exceeds a fixed value, the feeder line switch is subjected to overcurrent tripping; if the feeder line terminal detects fault current and zero voltage does not exceed a fixed value, no voltage and no current are detected, and the feeder line switch is tripped in an overcurrent mode.
Zero-sequence protection: fig. 3 is a logic diagram of zero sequence protection in this embodiment, where the zero sequence current protection reflects a fault when a line is grounded in a single phase, and when the single phase is grounded, a phase difference between a zero sequence current of a fault line and a zero sequence current of a non-fault line exists, and in this application, when the zero sequence current is greater than a fixed value (0.01 to 10.0A) of a current of a first segment of the zero current, and is delayed by a delay (0.01 to 1.0s) at an I end of the zero current, an action outlet of the first segment of the zero sequence overcurrent trips and gives an.
Overcurrent acceleration protection: fig. 4-5 are logic diagrams of the overcurrent acceleration protection in this embodiment, where the overcurrent acceleration protection is provided with an independent acceleration segment protection, and the overcurrent acceleration protection and/or the zero sequence protection can be selectively used, a manual closing acceleration loop at a feeder terminal is not required to be started by a contact of an external manual closing handle, current fixed values and time fixed values of the overcurrent acceleration protection and the zero sequence overcurrent acceleration protection can be independently set, and the post acceleration opening time is 200 ms.
Triple reclosing: fig. 6 is a logic diagram of the triple reclosing action of the embodiment, and the control word is selected to be a three-phase multiple reclosing, and at most three reclosings are supported. The reclosing starting mode has two types: there is no corresponding boot and protection boot. The reclosing is put in after charging is completed, the protection is not started when the line is in a normal operation state (the tripping position of the breaker is equal to 0 or current exists), and charging is completed through 15s under the condition that the discharge condition of the reclosing is not satisfied. When the secondary reclosing and the third reclosing are put in, the reclosing discharges after the switch is overlapped and does not reach the set overlapping times and the reclosing is opened again within the locking time limit; if the coincidence occurs after the success time limit is exceeded, the coincidence is determined to be another round, and the timing chart of the three-phase multiple reclosing action is shown in fig. 7. The time of the first reclosing is 0.3 s-300 s, the time of the second reclosing is 0.3 s-300 s, the time of the third reclosing is 0.3 s-300 s, the time of reclosing locking is 0.0 s-300 s, and the time of reclosing confirmation is 0.3 s-999 s.
The relay protection module judges the nature and the range of the fault of the feeder terminal on the basis of reflection and detection by using the change of the parameters, and further makes corresponding reaction and processing (such as sending out a warning signal or tripping a circuit breaker and the like) so that the feeder terminal has reliability, sensitivity, selectivity and quickness.
In an embodiment of the invention, one side of the switch for the ring-opening point becomes an a-side power grid, the other side becomes a B-side power grid, the delayed forward/backward transmission module is configured with power-on delayed closing, X time locking, instantaneous pressurization locking, voltage locking at two sides, closing confirmation, Y time locking and zero sequence overvoltage after closing, and Y time is the maximum time limit of fault current detected after the section switch is closed; the ring network point time-delay closing module comprises power supply confirmation, time-delay switching, instantaneous pressurization locking and two-side voltage locking; the closing module comprises a closed loop locking and a closed loop closing.
The automatic power distribution module realizes forward/backward transmission and ring network point delay closing functions and comprises the following functions:
power-on delay switching-on: fig. 18 is a logic diagram of power-on delayed closing, when power is off at both sides A, B and the FTU is not in a locked state, when power is supplied from one side, the FTU will execute to confirm that an accident starts XT time counting, and after the XT time counting is finished, the switch is closed; if power failure within Z time occurs in the process of X timing, X timing is continued to be accumulated after the power is supplied again.
In the embodiment, Z is short-time locking and opening, Z time is 3.5s +/-0.5 s, and the Z time is adjusted according to X time and protection series; and the feeder line terminal protection action time is overcurrent protection action time and is set according to the in-station value.
And (3) locking at X time: fig. 19 is a logic diagram of XT time locking in the present embodiment, in X time, a power failure occurs on the power supply side for more than Z time, and the X time locking function is activated; when power is transmitted from the load side, the switch is not switched on; the lock is released through an operating handle or a remote control or the lock is released after the X timing is finished by the incoming call from the power supply side.
Instantaneous pressurization and locking: FIG. 20 is a logic diagram of the instant pump shut-off of the present embodiment, wherein when the power source side has a voltage, and before the X-time, the feeder terminal detects that the load side has an instant voltage, the feeder terminal activates the instant pump shut-off function; the locking is released by operating a handle or remotely controlling or by the power on the instantaneous pressurizing side, and the locking is released after the X timing is finished.
Voltage locking at two sides: fig. 21 is a logic diagram of voltage locking at two sides of the present embodiment, in the X timing, if there is voltage at two sides, the voltage locking function at two sides is started, and after the X timing is finished, the switch is not closed; the lock is released by operating the handle or remotely controlling or by simultaneously powering off the two sides for more than Z time.
And (3) closing confirmation: after the switch is closed, the device starts Y time timing in order to confirm whether an accident occurs. In Y timing, if power failure less than Z time occurs, the switch immediately starts closing without X timing after power supply is recovered, and Y timing continues to be accumulated.
Y time locking: fig. 22 is a logic diagram of time locking in the present embodiment, in the Y-timer, when a power failure occurs for a time longer than Z, the YT time locking function is activated, and when power is supplied from the power supply side, the switch is not closed after the X-timer is completed; the lock is released by operating a handle or remotely controlling or the lock is released after the X timing is finished by the incoming call of the load side.
Zero-sequence overvoltage after synthesis: fig. 8 is a zero sequence overvoltage logic diagram after closing in the present embodiment, and the feeder line terminal detects a zero sequence voltage signal within Y time after closing, immediately opens the switch, and removes the ground fault.
And (3) power supply confirmation: fig. 23 is a logic diagram of power supply confirmation when the ring grid point is turned off in a delayed manner in the present embodiment, when power is supplied to one side, the YL time locking function is started, when power is supplied to both sides, the feeder terminal is started to confirm that there is no fault, YL timing is started, and YL time locking is released after YL timing is completed. In the YL timing process, power failure occurs in Z time, and the YL timing is continuously accumulated.
Delay investment: fig. 24 is a logic diagram of the switching in process of implementing the loop point delayed closing delay in the present embodiment, and after the YL timing is completed, if one side has power failure after the YL locking is unlocked, the feeder line terminal starts XL timing for reclosing confirmation. And after timing is finished through XL, the switch is switched on. If the power supply of the power failure side is recovered in Z time, XL timing is reset, and the state before power failure is kept.
Instantaneous pressurization and locking: FIG. 25 is the logic diagram of the instant compression latch-up when the ring-dot delay closing is realized in the present embodiment, and during the timing process of XL: within the power failure time Z, the instantaneous voltage is found at the power failure side, and XL timing continues to be accumulated; when the power failure time is not Z time, the power failure side finds the instantaneous voltage, XL time is reset, and the instantaneous pressurization locking function is started. Releasing the locking condition: (1) and the locking is released after the timing is finished by the operating handle or the remote control (2) YL.
Voltage locking at two sides: fig. 26 is a logic diagram of two-side voltage blocking when the ring-grid point delay switching is implemented in the present embodiment. In the XL timing process, voltages are arranged on two sides, XL timing reset of a feeder terminal is realized, and a YL time locking function is started to confirm YL timing. Releasing the locking condition: (1) through operating handle or remote control operation; (2) and after the YL timing is finished, the blocking is released.
Voltage-loss brake-separating: fig. 9 is a voltage-loss switching-off logic diagram of the present embodiment, and switching-off is performed after a setting time after voltages on both sides are lower than a set value. When the voltage type subsection S function is applied, if no overcurrent exists in Y time after the switch is switched on, the locking, voltage-losing and brake-separating function is reset after the locking time.
Closing a ring: fig. 10 is a logic diagram of the closed-loop locking of the present embodiment, wherein the closed-loop switching is selected as locking when the hand or the remote controller is switched on. If the power supply 1 is higher than the power-on voltage of PT1 and the power supply 2 is higher than the power-on voltage of PT2, the loop is closed. Otherwise, closing the outlet. Fig. 11 is a logic diagram of the closed-loop closing operation in the present embodiment, and when a hand or a remote controller is closed, the closed-loop operation/withdrawal selection is input. If the voltage difference between the two sides is less than the loop closing voltage difference, the loop is closed and the switch is closed through the loop closing time.
The function of realizing the out-of-limit alarm function by the out-of-limit alarm module comprises the following functions, reference is made to the following (fig. 15-17):
current out-of-limit (heavy load, overload, out-of-limit): the current over-limit function is mainly used by the master station, and the SOE is recorded after an event is generated, but an alarm lamp is not ignited.
Overvoltage: the overvoltage function is mainly used by the master station, and the SOE can be recorded after an event is generated, but the alarm lamp cannot be turned on. Note that there are 2 sets of voltages that can be switched on and off separately.
Low voltage: the low voltage function is mainly used by the master station, which records the SOE after the event is generated, but does not ignite the warning light. Note that there are 2 sets of voltages that can be switched on and off separately.
The application discloses automatic intelligent feeder terminal adopts modularization, expanded, low-power consumption design, has high reliability and adaptability, is applicable to multiloop centralized monitoring application occasions such as electricity distribution room, looped netowrk cabinet, switching station, box-type substation, possesses fault detection and fault discrimination function, can upload fault alarm information, but automatic re-setting is unusual, possesses real-time control and parameter setting's safety protection function.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.

Claims (9)

1. The utility model provides a distribution automation intelligence feeder terminal which characterized in that: the feeder line terminal comprises a relay protection module, an automatic power distribution module and an out-of-limit warning module, wherein the relay protection module is configured with quick-break protection, overcurrent accelerated protection, zero-sequence protection and triple reclosing; the automatic power distribution module is provided with a delayed forward/backward feeding module, a looped network point delayed closing module, a voltage-loss brake separating module and a closed loop; the out-of-limit warning module includes a current out-of-limit warning, an over-voltage warning, and a low-voltage warning;
for the first-end FTU equipment, when a switch is in an off position and a locking and closing signal does not exist, if no single-phase grounding characteristic direction memory exists, the first-end FTU is closed after the X time, and the X time of the first-end FTU is greater than the reclosing charging time at a substation outgoing switch; if the first-end FTU detects that the single-phase earth fault line selection trips, the first-end FTU is switched on after line selection coincidence time;
for a non-head end FTU, when a switch is in an open position and a closing signal is not locked, if the non-head end FTU detects that a single-phase earth fault or an interphase short circuit fault occurs, the switch is closed after X time when the single-side voltage is recovered; if the FTU detects that no single-phase earth fault or interphase short circuit fault occurs, switching on after S time when the single side recovers to have voltage;
and X is automatic closing, S is self-adaptive long delay, and S time is greater than the sum of all X times of the longest trunk line of the line.
2. A power distribution automation intelligent feeder terminal according to claim 1 characterised in that: the delayed forward/backward feeding module is configured with power-on delayed closing, X time locking, instantaneous pressurization locking, voltage locking at two sides, closing confirmation, Y time locking and zero sequence overvoltage after closing, and Y time is the maximum time limit for detecting fault current after the section switch is closed; the ring network point time-delay closing module comprises power supply confirmation, time-delay switching, instantaneous pressurization locking and two-side voltage locking; the closing module comprises a closed loop locking and a closed loop closing.
3. A power distribution automation intelligent feeder terminal according to claim 1 characterised in that: the overcurrent acceleration protection is provided with independent acceleration section protection, the overcurrent acceleration protection and/or zero sequence protection can be selectively used, and the post-acceleration opening time is 200 ms.
4. A power distribution automation intelligent feeder terminal according to claim 1 characterised in that: the triple reclosing starting mode has two modes: starting and protection starting are not corresponded, when secondary and third reclosure are switched in, the reclosure discharges after the switch is superposed and does not reach the set superposition times, and the reclosure is switched off again within the locking time limit; if the coincidence occurs after the success time limit is exceeded, it is determined that there is another round of coincidence.
5. A power distribution automation intelligent feeder terminal according to claim 2 characterised in that: after the voltages at two sides of the voltage-loss brake-separating module are lower than a set value, the voltage-loss brake-separating module separates the brake after setting time; when the voltage type subsection S function is applied, if no overcurrent exists in Y time after the switch is switched on, the voltage loss and the brake separation are locked, and the voltage loss and the brake separation are reset after the locking time.
6. A power distribution automation intelligent feeder terminal according to claim 1 characterised in that: when a single-phase grounding fault occurs in the normal operation of the line, the FTU at the head end performs grounding line selection according to the single-phase grounding characteristic direction, and trips within the line selection tripping time after the line grounding fault is judged; if the line is a permanent single-phase earth fault line, the head end FTU trips for the first time in the line selection tripping time of the head end FTU; after the line selection reclosing time is closed, if a single-phase earth fault is detected within Y time after the closing, the single-phase earth fault is immediately tripped through short delay; and if the single-phase earth fault is not detected within Y time after the switch is closed, the trip is not performed.
7. A power distribution automation intelligent feeder terminal according to claim 1 characterised in that: the overcurrent protection is backup protection of the circuit, protects the whole section of the circuit, and has longer action time than quick-break protection time.
8. A power distribution automation intelligent feeder terminal according to claim 2 characterised in that: closing a loop and locking: when the hand is closed or the remote controller is switched on, the closed loop switching-on and switching-off is selected to be locking; closing a loop and closing a switch: when the hand is closed or the remote controller is closed, the loop closing switching is selected as input, if the voltage difference between two sides of the loop point delay closing module is smaller than the loop closing voltage difference, the loop is closed through the loop closing time.
9. A power distribution automation intelligent feeder terminal according to claim 2 characterised in that: zero-sequence overvoltage after synthesis: and in Y time after the feeder line terminal is switched on, a zero sequence voltage signal is detected, the switch is immediately switched off, and the ground fault is removed.
CN202010715791.1A 2020-07-23 2020-07-23 Distribution automation intelligence feeder terminal Active CN111711276B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112540250A (en) * 2020-11-30 2021-03-23 广东电网有限责任公司 Power distribution automation terminal test system based on modular control
CN113156183A (en) * 2021-03-08 2021-07-23 上海宏力达信息技术股份有限公司 Two-way voltage detection device on intelligence post
CN114336970A (en) * 2021-12-30 2022-04-12 广东欲丰电器制造有限公司 Feeder terminal device
CN115498774A (en) * 2022-10-26 2022-12-20 珠海康晋电气股份有限公司 Microcomputer type distribution automation station terminal based on multi-line measurement and control

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JPH06148254A (en) * 1992-11-09 1994-05-27 Tohoku Electric Power Co Inc Flashover display device
CN2624494Y (en) * 2002-12-20 2004-07-07 安徽中兴继远信息技术有限公司 Power distribution automation feeder line monitor terminal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06148254A (en) * 1992-11-09 1994-05-27 Tohoku Electric Power Co Inc Flashover display device
CN2624494Y (en) * 2002-12-20 2004-07-07 安徽中兴继远信息技术有限公司 Power distribution automation feeder line monitor terminal

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112540250A (en) * 2020-11-30 2021-03-23 广东电网有限责任公司 Power distribution automation terminal test system based on modular control
CN113156183A (en) * 2021-03-08 2021-07-23 上海宏力达信息技术股份有限公司 Two-way voltage detection device on intelligence post
CN114336970A (en) * 2021-12-30 2022-04-12 广东欲丰电器制造有限公司 Feeder terminal device
CN115498774A (en) * 2022-10-26 2022-12-20 珠海康晋电气股份有限公司 Microcomputer type distribution automation station terminal based on multi-line measurement and control
CN115498774B (en) * 2022-10-26 2023-09-29 珠海康晋电气股份有限公司 Microcomputer type distribution automation station terminal based on multi-line measurement and control

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