Improved self-adaptive feeder automation protection method

Abstract

The invention belongs to the field of power grid feeder lines, and relates to an improved self-adaptive feeder line automatic protection method. Feeder line terminals connected with section switches are configured according to a unified level difference; when the power grid breaks down, the section switch A closest to the power supply side of the fault point is switched off, and the section switch B closest to the load side of the fault point loses voltage and is not switched off; if the fault is a permanent fault, the fault is detected again after the section switch A is switched on, the section switch A is switched off in an accelerated manner and is locked in the forward direction, and the section switch B in a voltage-loss closed position state detects short-time power supply and switches off; and the interconnection switch is switched on to reversely supply power from the other power supply side, and the section switch from the interconnection switch to the fault point is switched on in sequence and adaptively adjusts protection parameters until the section switch B detects a fault and has one-time short-time power-on memory, and the section switch B accelerates switching-off and is reversely locked. According to the invention, fault feeder isolation is realized nearby without cooperation of an outgoing line switch and step-by-step closing.

Description

Technical Field

[0001] The invention belongs to the technical field of power grid feeder automation, and in particular relates to an improved adaptive feeder automation protection method. Background Art

[0002] The distribution network is an important part of the smart grid. The construction goal of the smart distribution network is to have a complete fault self-healing function, which can minimize the impact of distribution network faults on users. However, the current grid structure of the distribution network is weak, which makes distribution network power outages occur from time to time. At the same time, the secondary protection and feeder automation technology are not perfect, resulting in the expansion of the fault power outage area and the extension of the power outage time. It can be seen that the protection control of the distribution network and its fault self-healing technology are directly related to the operating efficiency of the entire distribution system and the power quality of end users.

[0003] The function of feeder automation is to automatically locate, isolate and restore power supply after a medium-voltage distribution line fails. Since it can avoid and reduce the impact of distribution network failures on users, it is a distribution network fault self-healing control technology. Feeder automation includes centralized feeder automation and local feeder automation. Centralized feeder automation refers to a feeder automation processing mode that collects distribution terminal information after a failure to the distribution master station through the cooperation of the distribution master station and the distribution terminal, with the help of the communication network, and the distribution master station analyzes the fault information to achieve fault location of the faulty line, isolation of the faulty feeder and restoration of power supply to the non-faulty area.

[0004] On-site feeder automation does not rely on communication and master station fault analysis, but relies on logic such as voltage loss tripping and incoming power closing to achieve automatic fault isolation. On-site feeder automation includes the principles and fault handling logic of three modes: voltage-time type, voltage-current-time type, and adaptive type. However, the existing on-site feeder automation fault handling methods have the disadvantages of single fault handling type, inability to adapt to changes in grid structure, high number of reclosing times, and long processing time. In particular, for instantaneous faults that account for 70% to 80% of distribution network faults, the advantages of on-site feeder automation protection have not been fully utilized. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides an improved adaptive feeder automation protection method to overcome the problems and defects of the prior art. The technical solution adopted by the present invention is as follows: An improved adaptive feeder automation protection method is provided in a power grid line with a complete set of feeder terminals and pole switches, the feeder terminals are provided with a processor, and the pole switches include a section switch and a tie switch; the method comprises the following steps: When a fault occurs in the power grid, the sectionalizer A located on the power supply side and closest to the fault point is opened first, and the sectionalizer B located on the load side and closest to the fault point does not open due to pressure loss; after a delay of X time, the sectionalizer A is closed. If the fault is a transient fault, the feeder resumes normal power supply. If the fault is a permanent fault, the fault is detected again within Y time after the sectionalizer A is closed, and the Y time is less than the X time, the sectionalizer A accelerates to open and positively locks, and the sectionalizer B in the pressure-loss closed state detects a short-term power supply, and the sectionalizer B opens; The feeder terminal corresponding to the tie switch dynamically adjusts the transfer delay parameters according to the total number of sectional switches; the feeder terminal corresponding to the tie switch detects a single-side voltage loss, and after a delay, the tie switch closes to reversely supply power from the other power supply side. After the tie switch transfers power, the flow direction changes, and the sectional switches from the tie switch to the fault point are closed in sequence under the control of the corresponding connected feeder terminal, and the numbering and protection parameters are adaptively adjusted synchronously until sectional switch B detects a fault and has a short-time call memory, and sectional switch B accelerates the opening and reverse locks.

[0006] Preferably, according to the different positions of the section switches, the feeder terminals corresponding to the section switches are configured in sequence according to a uniform differential configuration. The uniform differential configuration is to uniformly number and adjust the positions of several section switches on the feeder between the power supply side and the connecting switch. The section switch farthest from the power supply side is numbered as the starting number, the section switches in the middle are numbered sequentially, and the section switch closest to the power supply side is numbered as the ending number. Each section switch is uniformly configured according to the uniform numbering protection parameters.

[0007] Preferably, the incoming call pressure setting value is set to 20% of the rated voltage, and any phase voltage or line voltage greater than the incoming call pressure setting value is judged as incoming call; the no-pressure setting value is set to 15% of the rated voltage, and any phase voltage or line voltage less than the no-pressure setting value is judged as no-pressure.

[0008] Preferably, the automated protection method includes short circuit protection and grounding protection, and the protection strategy is: one level difference, accelerated isolation and one reclosing.

[0009] Beneficial effects of the present invention: The present invention realizes dynamic adjustment of feeder terminal protection parameters corresponding to the section switch according to the position of the section switch, and combines the advantages of local protection strategy and hierarchical protection, including: closing the switch to adapt to isolation before fault and accelerating the protection opening and positive locking at the fault, and detecting short-time power opening to adapt to isolation after fault, closing the switch to the fault and accelerating the opening and positive locking when there is a short-time power, without the need for the coordination of the outgoing line switch and the step-by-step closing, and realizing the isolation of the faulty feeder nearby, thereby reducing the scope of power outage, and restoring power supply faster, reducing the number of times of switch reclosing under the traditional method, and the impact on loads and equipment, thereby increasing the service life of power grid equipment and switches, and reducing the impact damage caused by fault current to users. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the specific implementation of the present invention or the technical solution in the prior art, the following is a brief introduction to the drawings required for the description of the specific implementation or the prior art. Obviously, the drawings described below are some specific implementations of the present invention. For ordinary technicians in this field, other drawings within the protection scope of this application can be obtained based on these drawings without creative work.

[0011] Figure 1 is a control strategy flow chart of an adaptive feeder automation protection method according to an embodiment of the present invention; Figure 2 is a schematic diagram of a power grid architecture according to an embodiment of the present invention; Figure 3 Schematic diagram of the switch opening before the fault point of a short-circuit fault according to an embodiment of the present invention; Figure 4 This is a schematic diagram of delayed closing of a switch in front of a fault point and restoration of power supply after an instantaneous fault according to an embodiment of the present invention; Figure 5 This is a schematic diagram of isolating a permanent fault point in front of an embodiment of the present invention; Figure 6 It is a schematic diagram of load transfer, dynamic adjustment of FB5 protection parameters and step-by-step closing in an embodiment of the present invention; Figure 7 Schematic diagram of dynamic adjustment of FB4 protection parameters and step-by-step closing of the circuit breaker in an embodiment of the present invention; Figure 8 It is a schematic diagram of dynamic adjustment of FB3 protection parameters and closing and fault in an embodiment of the present invention; Fig. 9 It is a schematic diagram of post-isolation of a permanent fault point of a short-circuit fault according to an embodiment of the present invention. DETAILED DESCRIPTION

[0012] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments.

[0013] As Figure 1 shown, an improved adaptive feeder automation protection method is provided. In the main grid line, a feeder terminal and a pole-mounted switch are provided. The feeder terminal and the pole-mounted switch are complete sets of equipment used in the grid. The feeder terminal is the control unit of the pole-mounted switch. The feeder terminal is equipped with a processor, and the feeder terminal controls the opening and closing actions of the pole-mounted switch through its own processor. The pole-mounted switch includes: sectionalizing switch, sectionalizing switch for boundary, and tie switch. According to the different positions of the sectionalizing switches, the feeder terminals corresponding to the sectionalizing switches are configured in sequence according to a unified step difference. The feeder terminals corresponding to the sectionalizing switches automatically realize the dynamic adjustment of protection parameters according to the sectionalizing switch numbers, without the cooperation of the outgoing line switch and step-by-step closing, and isolate the faulty feeder nearby, reducing the power outage range.

[0014] When a fault occurs in the main grid line, the feeder terminal will detect the fault point and its location in the first place. The feeder terminal is the protection control unit. There are many types of protection, such as: overcurrent protection, zero-sequence voltage protection, overload protection, and small current grounding protection. In the embodiments of the present invention, the front and the back are referenced with respect to the fault point. The power supply side (substation) of the fault point is the front, and the load side of the fault point is the back. The first-stage sectionalizing switch A closest to the fault point in front of the fault point will first trip under the control of the feeder terminal A, and the first-stage sectionalizing switch B behind the fault point will not trip due to loss of voltage under the control of the feeder terminal B.

[0015] After a time delay of X, the sectionalizing switch A closes. If the fault is a transient fault, the fault has disappeared after the sectionalizing switch closes, and the feeder resumes normal power supply. In the embodiments of the present invention, X is set to 3 seconds. If the fault is a permanent fault, the fault is detected again within Y seconds after the sectionalizing switch A closes, and the sectionalizing switch A accelerates tripping and locks positively. The sectionalizing switch B in the post-fault first-stage loss-of-voltage and closed position (the closed position means that the sectionalizing switch B is in the closed position, and the closed position is also called the remote signaling state (a closed state)), detects a short-term power-on (with a duration of Y), and the sectionalizing switch B trips. In the embodiments of the present invention, Y < X, and Y is set to 2 seconds.

[0016] The feeder terminal corresponding to the tie switch detects a single-side voltage loss. After a certain delay, the tie switch closes to realize reverse power supply from the other power supply side. The section switches from the tie switch to the fault point are closed in sequence until the nearest section switch B behind the fault point detects the fault and has a short-term call memory (duration is Y). Section switch B accelerates opening and locks, realizing isolation behind the fault point. The isolation range is between the two section switches closest to the fault point.

[0017] The unified differential configuration is uniformly set according to the position of the sectionalizer on the feeder. The sectionalizer farthest from the power supply side is numbered as the starting number M1, and the sectionalizers in the middle are numbered from M2 to M3. S-1 The segment switch number closest to the power supply side is the termination number M S , here M N Is a positive integer value, representing the number of the segmented switch. S represents the total number of segmented switches in a certain power grid line, N represents the position number of any segmented switch, 1≤N≤S. Taking into account that the action time of the segmented switch includes the protection judgment time and the switch action time, the overcurrent protection differential of the segmented switch is uniformly configured to 0.13 seconds, and the overcurrent protection delay of the segmented switch numbered N is N×0.13. The current industry standard requirement is that the time from the feeder terminal detecting a fault to controlling the segmented switch to completely open is 100 milliseconds. The embodiment of the present invention leaves a margin of 30 milliseconds here to ensure that the segmented switch can be completely opened. The small current grounding protection differential of the segmented switch is uniformly configured to 2 seconds, and the small current grounding protection delay of the segmented switch numbered N is (N-1)×2+20 seconds. Small current grounding is allowed to run with fault for one hour, and the fault protection time requirement is not so strict. The increase of 20 seconds is mainly to avoid instantaneous grounding faults. There is no strict regulation in the industry for the 2 seconds specified in this embodiment. It depends on the algorithms of various companies. Generally, 20 cycles and 400 milliseconds can determine a small current grounding fault.

[0018] The uniform numbering configuration of the section switches is affected by the flow direction. It is stipulated that when the current flows from the power supply side to the load side, the flow direction is positive. Conversely, after the connecting switch is switched, the current flows from the original load side to the power supply side. At this time, the flow direction is defined as negative. In order to ensure that there is no over-tripping after the flow direction changes, in the embodiment of the present invention, the numbering and protection delay of the section switches are automatically adaptively adjusted after the connecting switch is switched. The numbering of the section switch FB5 closest to the connecting switch is adjusted from M1 to M5, the section overcurrent protection delay is adjusted to (5-1+1)×0.13, and the section small current grounding protection delay is adjusted to (5-1)×2+20. The corresponding number is N. The numbering of other section switches is M. N Adjust to M S-N+1, the section overcurrent protection delay is adjusted to (S-N+1)×0.13, and the section small current grounding protection delay is adjusted to (SN)×2+20.

[0019] In an embodiment of the present invention, the automated protection method includes short-circuit protection and grounding protection. All the sectional switches before the fault point detect the fault, but the sectional switch immediately adjacent to the fault has the smallest protection delay, and the protection trip is started first. Before the fault, the other sectional switches have not reached the protection delay, and the protection reset does not work. After the fault feeder is isolated, the other sectional switches before the fault point are reset. Acceleration protection is a protection function, which refers to a fast protection trip mode when a fault is detected again after the sectional switch is closed after a fault occurs. It is equivalent to quick-break protection. Acceleration protection is an existing technology that is being applied. Here, it is described from the perspective of protection function. Acceleration protection includes: overcurrent acceleration protection, zero current acceleration protection and small current grounding acceleration protection. Zero current acceleration protection and small current grounding acceleration protection are both existing technologies. The overcurrent acceleration protection time window is set to 0 seconds, and the small current acceleration protection is set to 0.5 seconds.

[0020] The sectionalizing switch numbered S is the first sectionalizing switch, which cooperates with the outgoing line switch. The outgoing line switch is equipped with a reclosing switch, the reclosing time is set to 2 seconds, the overcurrent protection delay is (S+1)×0.13 seconds, the small current grounding protection delay is S×2+20 seconds, the overcurrent acceleration protection time window is set to 0 seconds, and the small current acceleration protection is set to 0.5 seconds. The first sectionalizing switch will open and reversely lock when it detects a short-term power supply, ensuring that the fault point can be effectively opened and locked between the outgoing line switch and the first sectionalizing switch.

[0021] The sectionalizer after the fault point will not open after the voltage is lost. It will open again when a short-time power is detected after the voltage is lost. The short-time power is less than the X time. The power supply voltage setting value is set to 20% of the rated voltage. Any phase voltage or line voltage greater than the power supply voltage setting value is judged as power supply; the no-voltage setting value is set to 15% of the rated voltage. All phase voltages or line voltages less than the no-voltage setting value are judged as no-voltage. The residual voltage setting value is not less than 50% of the rated voltage, and the residual voltage pulse time is not less than 60 milliseconds.

[0022] like Figure 2 As shown, it is a schematic diagram of the power grid architecture of an embodiment of the present invention. Figure 2The architecture shown is an adaptive automation processing scenario when a feeder short circuit fault occurs in the main line of the power grid, including: the outgoing line switch CB of the substation of the main line of the power grid, the section switch 1 FB1 to the section switch 5 FB5 are sequentially arranged in the main line of the power grid, the boundary switch 1 FJ1 is connected between the section switch 1 FB1 and the section switch 2 FB2 at one end, and the other end is connected to the user 1, the boundary switch 2 FJ2 is connected between the section switch 3 FB3 and the section switch 4 FB4 at one end, and the other end is connected to the user 2, the contact switch LS1 is connected to the section switch 5 FB5, for the dual power supply system, the two ends are substations, and the contact switch LS1 is usually in the open state. All the outgoing line switches, section switches, boundary switches and contact switches are pole switches controlled by their corresponding feeder terminals. The outgoing switch CB is equipped with three sections (Section I, Section II and Section III) of overcurrent protection. The overcurrent protection time limit of Section I is 0 seconds and the protection range of Section I is between the outgoing switch CB and the first section (FB1). The overcurrent protection time limit of Section II is 0.9 seconds, and the overcurrent protection time limit of Section III is 1.2 seconds. The protection range of Section II and Section III is between the first section and the contact switch LS1, that is, the end of the line. Only one level of protection is required to match the level difference and configure a reclosing switch. The section switches FB1-FB5 are put into closing acceleration protection and positive locking function, and the subsequent acceleration protection time limit is uniformly set to 0 seconds. The X time is uniformly set to 3 seconds, and the Y time is uniformly set to 2 seconds. The section switches FB1-FB5 are put into overcurrent section I, and the overcurrent protection time limit is dynamically adjusted according to the switch position. Overcurrent acceleration, zero current acceleration, and zero pressure acceleration are put into operation, and the acceleration time is 0 seconds. The small current grounding protection is put into operation, and the protection time is dynamically adjusted according to the switch position. The short-term power-on trip is put into the closing position when the pressure is lost. Boundary switch FJ1 and boundary switch FJ2 are set to reclose once, with a reclosing time of 3 seconds, overcurrent protection stage 1, delay of 0 seconds, acceleration protection, and the acceleration protection time limit is 0 seconds. The transfer time limit of contact switch LS1 is set to 5.85 seconds (according to the formula in Table 1, 3+2+0.13×5+0.2, 0.2 is 0.2 seconds reserved for the switch on the pole farthest from the single-side pressure loss). The protection parameter configuration of the outgoing switch CB, section switches FB1-FB5, boundary switches FJ1-FJ2, and contact switch LS1 is shown in Table 1 below.

[0023] Table 1 Parameter configuration Outgoing CB Segment FB1 Segment FB2 Segment FB3 Segment FB4 Segment FB5 Boundary FJ1, FJ2 Contact LS1 Forward Power Flow Coding / M5 M4 M3 M2 M1 / / Overcurrent protection Section I: 0 seconds Section II: 0.78 seconds Section III: 1.0 seconds I segment 0.65 seconds I segment 0.52 seconds I segment 0.39 seconds I segment 0.26 seconds I segment 0.13 seconds I segment 0 seconds / Outgoing line switch detects pressure and recloses (section switch x time) 1 time, 3 seconds 3 seconds 3 seconds 3 seconds 3 seconds 3 seconds 3 seconds / Closing acceleration protection and positive locking / 0 seconds 0 seconds 0 seconds 0 seconds 0 seconds 0 seconds 1 time, 0.1 seconds Short-time call detection time trip / 0.78s~0.92s or 0s~0.14s 0 seconds ~ 0.14 seconds 0 seconds ~ 0.14 seconds 0 seconds ~ 0.14 seconds 0 seconds ~ 0.14 seconds / / Acceleration protection opening time (Y time) / 2 seconds 2 seconds 2 seconds 2 seconds 2 seconds / / Tie switch starts power transfer timing / / / / / / / One-side pressure loss (0.2) + X + Y + 0.13 × S, set according to the maximum delay The improved adaptive feeder automation protection method according to the embodiment of the present invention has the following fault isolation steps: (a) If Figure 2As shown, the main line of the power grid is in normal state, the flow direction is positive, the outgoing line switch CB, the section switches FB1~FB5, and the boundary switches FJ1-FJ2 remain in the closed state, and the feeder terminals corresponding to the section switches FB1~FB5 perform adaptive adjustment of protection parameters according to the section switch positions (section switch numbers), and the parameters of the tie switch are automatically adjusted according to the total number of section switches according to the above table.

[0024] (b) If Figure 3 As shown in the figure, suppose there is a phase-to-phase short circuit fault between the sectionalizer 2 FB2 and the sectionalizer 3 FB3, the sectionalizer 2 FB2 overcurrent protection stage I is activated, and the switch is opened after a protection delay of 0.52 seconds, and the sectionalizer 1 FB1 does not reach the protection delay of 0.65, the fault is reset, and the switch remains closed. The sectionalizer FB3-FB5 and the boundary switch FJ1-FJ2 remain closed.

[0025] (c) If Figure 4 As shown, the section switch 2 FB2 will reclose (re-close) after 3 seconds. If it is a transient fault, the section switch 2 FB2 will reclose successfully and the feeder will resume normal power supply.

[0026] (d) If Figure 5 As shown, if it is a permanent fault, the section switch FB2 is closed and the overcurrent acceleration protection is started. The section switch FB2 is immediately opened and positively locked to achieve isolation before the fault point. The section switches FB3-FB5 are closed and detect short-term power and open, and the short-term power action is memorized.

[0027] (e) If Figure 6 As shown, the contact switch LS1 detected a single-side pressure loss. After 5.85 seconds, the load was transferred. The section switch FB5 detected that the flow direction had changed. The corresponding feeder terminal dynamically adjusted the protection parameters according to the position of the switch on the pole. The section switch FB5 was numbered from M1 to M5. The feeder terminal corresponding to the section switch FB5 detected that there was pressure on one side. After 3 seconds, the section switch FB5 was closed.

[0028] (f) If Figure 7 As shown, the section switch FB4 detects that the flow direction has changed, and the corresponding feeder terminal dynamically adjusts the protection parameters according to the position of the pole switch. The section switch FB4 number changes from M2 to M4. The feeder terminal detection corresponding to the section switch FB4 detects that there is pressure on one side. After 3 seconds, the section switch FB4 is closed.

[0029] (g) If Figure 8 As shown, the section switch 3 FB3 detects that the flow direction has changed, and the corresponding feeder terminal dynamically adjusts the protection parameters according to the position of the pole switch. The section switch 3 FB3 is still numbered M3. The feeder terminal corresponding to the section switch 3 FB3 detects that there is pressure on one side. After 3 seconds, the section switch 3 FB3 is closed.

[0030] (h) If Fig. 9 As shown, the section switch 3 FB3 is closed, and the feeder terminal corresponding to the section switch 3 FB3 detects that the fault (permanent fault) is still there and there is a short-term power memory. The section switch 3 FB3 accelerates to open and reverse locks, realizing the isolation of the feeder range after the fault point.

[0031] The embodiment of the present invention designs an improved adaptive feeder automation protection strategy of "one level difference, accelerated isolation, and one reclosing", optimizes the separation and closing strategy, realizes dynamic adjustment of feeder terminal protection parameters according to the position of the pole switch, integrates control strategies such as accelerated protection and no separation when the voltage is lost, and realizes fault location and isolation of faulty feeders before and after the fault point. The isolation of the fault point is all local isolation, and there is no need for the outlet switch CB to cooperate with the separation, which greatly reduces the impact of large-scale power outages caused by the separation of the outlet switch CB, shortens the time from the step-by-step closing of the outlet switch CB to the fault point, and realizes fault location and isolation of faulty feeders more quickly. The embodiment of the present invention designs methods such as "no separation when the voltage is lost, accelerated separation when the fault is detected", changes the original isolation fault mode of separation when the voltage is lost and closing when the power is on, greatly reduces the power outage time and scope, especially for instantaneous faults that account for 70% to 80% of the distribution network faults, with stronger adaptability and wider adaptability area, and has good application and promotion value.

[0032] In the embodiments of the present invention, technical features that are not described in detail are all existing technologies or conventional technical means and will not be described in detail here.

[0033] Finally, it should be noted that the above embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them, and the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any technician familiar with the technical field can modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be covered within the protection scope of the present invention.

Claims

1. An improved adaptive feeder automation protection method, wherein a complete set of feeder terminals and pole switches are provided in the power grid line, wherein the feeder terminals are provided with processors, and the pole switches include section switches and tie switches; characterized in that: The following steps are involved: When a fault occurs in the power grid, the sectionalizer A located on the power supply side and closest to the fault point is opened first, and the sectionalizer B located on the load side and closest to the fault point does not open due to pressure loss; after a delay of X time, the sectionalizer A is closed. If the fault is a transient fault, the feeder resumes normal power supply. If the fault is a permanent fault, the fault is detected again within Y time after the sectionalizer A is closed, and the Y time is less than the X time, the sectionalizer A accelerates to open and positively locks, and the sectionalizer B in the pressure-loss closed state detects a short-term power supply, and the sectionalizer B opens; The feeder terminal corresponding to the tie switch dynamically adjusts the transfer delay parameters according to the total number of sectional switches; the feeder terminal corresponding to the tie switch detects a single-side voltage loss, and after a delay, the tie switch closes to reversely supply power from the other power supply side. After the tie switch transfers power, the flow direction changes, and the sectional switches from the tie switch to the fault point are closed in sequence under the control of the corresponding connected feeder terminal, and the numbering and protection parameters are adaptively adjusted synchronously until sectional switch B detects a fault and has a short-time call memory, and sectional switch B accelerates the opening and reverse locks.

2. The improved adaptive feeder automation protection method according to claim 1, characterized in that: According to the different positions of the section switches, the feeder terminals corresponding to the section switches are configured in a unified differential configuration in sequence. The unified differential configuration is to uniformly number and adjust the positions of several section switches on the feeder between the power supply side and the connecting switch. The section switch farthest from the power supply side is numbered as the starting number, the section switches in the middle are numbered sequentially, and the section switch closest to the power supply side is numbered as the ending number. Each section switch is uniformly configured according to the unified number protection parameters.

3. The improved adaptive feeder automation protection method according to claim 2, characterized in that: The incoming power pressure setting value is set to 20% of the rated voltage. If any phase voltage or line voltage is greater than the incoming power pressure setting value, it is judged as incoming power; the no-voltage setting value is set to 15% of the rated voltage. If any phase voltage or line voltage is less than the no-voltage setting value, it is judged as no-voltage.

4. The improved adaptive feeder automation protection method according to claim 2, characterized in that: The automatic protection method includes short circuit protection and grounding protection, and the protection strategy is: one level difference, accelerated isolation and one reclosing.

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