TWI838902B - Protection logic planning based on goose application strategy and power supply system - Google Patents

Abstract

The present invention discloses a protection logic planning based on a GOOSE application strategy and power supply system. The protection logic planning includes: two of the distribution feeders have an accident at the same time, and the instantaneous phase-to-phase overcurrent protection element (50P) and the instantaneous grounding overcurrent protection element (50N) of the corresponding two intelligent electronic devices are activated, and after a first predetermined time, output a first trip signal to stop the power supply of the two distribution feeders in the accident; and one of the distribution feeders has an accident, so that the time-delayed phase-to-phase overcurrent protection element (51P) and the time-delayed grounding overcurrent protection element (51N) of the corresponding intelligent device operate, and the power distribution feeder in which the accident occurs is stopped and within a second predetermined period of time, the other one of the distribution feeders is activated due to an accident, and the instantaneous phase-to-phase overcurrent protection element (50P) and the instantaneous ground overcurrent protection element (50N) of the corresponding intelligent electronic device are activated and delayed for a third predetermined time, output a second trip signal to stop the power supply of the other distribution feeder where the accident occurred.

Description

Introducing GOOSE application strategy into protection logic planning and power supply system

The present invention relates to a protection logic planning and power supply system that introduces a GOOSE application strategy, which can eliminate the over-level tripping problem caused by accidents occurring simultaneously or successively in a short period of time on two or more feeder lines in the power supply system.

In response to the government's energy policy, the smart grid is actively promoted. Smart substations that comply with the IEC61850 standard are the most important part. They integrate information technology, communication technology and intelligent equipment to make the power system safer, more stable and reliable.

In the process of substation intelligence, intelligent electronic devices (IED) play a very important role. In addition to providing the functions of traditional protection poles, they combine equipment monitoring and communication transmission to transmit the status and data of equipment in the substation to the supervisory control and data acquisition-human machine interface (SCADA-HMI) through communication. In the early days, the communication protocols of various IED brands were inconsistent and system integration was impossible. Therefore, the IEC 61850 communication standard will solve this problem, allowing IEDs from different manufacturers to achieve interoperability, making the system planning of smart substations more free and flexible, and achieving the goal of longer-term and stable power supply. Among them, the Generic Object Oriented Substation Event (GOOSE) function of the IEC 61850 communication protocol quickly transmits relevant information of IED through Ethernet. Its maximum communication delay is required to be within 3ms, which can effectively save the input/output (I/O) points required by IED, reduce the configuration of on-site hard wires, and achieve a faster and more stable protection method.

In addition, the protection system of the distribution level is mostly coordinated by upstream and downstream protection to provide delayed overcurrent protection function. However, the distribution level feeders are mostly radial networks. When designing, they generally only simulate a single feeder accident to calculate the time curve of upstream and downstream protection coordination. Therefore, when two or more feeders have accidents at the same time or successively in a short period of time, it may destroy the original protection coordination with the upstream main circuit breaker (Main CB), causing the main circuit breaker to trip prematurely and derive a cross-level tripping accident, causing the entire distribution feeder to be completely out of power.

Therefore, how to apply the IEC 61850 GOOSE protection strategy to eliminate the over-tripping problem caused by accidents on two or more feeder lines in the power supply system has always been one of the topics that power companies attach great importance to.

In view of the above topic, the purpose of the present invention is to provide a protection logic planning and power supply system that introduces the GOOSE application strategy, which can introduce the GOOSE application strategy into the distribution level feeder protection terminal to achieve a more complete protection mechanism, thereby eliminating the over-level tripping problem caused by accidents occurring simultaneously or successively in a short period of time on two or more distribution feeders, making the power supply system more stable.

To achieve the above-mentioned purpose, according to a protection logic planning of the present invention that introduces the GOOSE application strategy, it is applied to a power supply system, the power supply system includes a main feeder, a plurality of distribution feeders of the same bus and a plurality of intelligent electronic devices, the main feeder is connected to the distribution feeders, each intelligent electronic device is respectively set corresponding to each distribution feeder, and each intelligent electronic device respectively controls whether each distribution feeder supplies power; wherein Each intelligent electronic device includes an instantaneous ground overcurrent protection element (50N), an instantaneous phase overcurrent protection element (50P), a delayed ground overcurrent protection element (51N) and a delayed phase overcurrent protection element (51P); the protection logic planning includes: when two of the distribution feeder lines have an accident at the same time, the instantaneous phase overcurrent protection elements of the two corresponding intelligent electronic devices are The overcurrent protection element (50P) and the instantaneous ground overcurrent protection element (50N) start to operate, and after a first predetermined time, a first trip signal is output to stop the power supply of the two distribution feeders where the fault occurs; and when one of the distribution feeders has an fault, the delayed phase overcurrent protection element (51P) and the delayed ground overcurrent protection element (51N) of the corresponding intelligent electronic device are activated. , causing the distribution feeder where the accident occurred to stop supplying power and within a second predetermined time, the other feeders of the distribution feeders also have accidents, and the instantaneous phase overcurrent protection element (50P) and instantaneous ground overcurrent protection element (50N) of the corresponding intelligent electronic device are activated and delayed for a third predetermined time, and then a second trip signal is output to stop the power supply of the other distribution feeder where the accident occurred.

To achieve the above object, a power supply system according to the present invention includes a main feed line, a plurality of distribution feed lines of the same bus bar, and a plurality of intelligent electronic devices. The distribution feed lines are connected to the main feed line. The intelligent electronic devices are respectively arranged corresponding to the distribution feeders, and each intelligent electronic device controls whether each distribution feeder supplies power; each intelligent electronic device comprises an instantaneous ground overcurrent protection element (50N), a delayed ground overcurrent protection element (51N), an instantaneous phase overcurrent protection element (50P) and a delayed phase overcurrent protection element (51P); wherein the power supply system has a protection logic plan that introduces a GOOSE application strategy, and the protection logic plan includes: when two of the distribution feeders have an accident at the same time, the instantaneous phase overcurrent protection element (50P) and the instantaneous ground overcurrent protection element (50N) of the two corresponding intelligent electronic devices are activated. , and after a first predetermined time, a first trip signal is output to stop the power supply of the two distribution feeders where the accident occurs; and when an accident occurs in one of the distribution feeders, the delayed phase overcurrent protection element (51P) and delayed ground overcurrent protection element (51N) of the corresponding intelligent electronic device are activated, so that the distribution feeder where the accident occurs stops supplying power and within a second predetermined time, the other feeders of the distribution feeders also have an accident immediately, so that the instantaneous phase overcurrent protection element (50P) and instantaneous ground overcurrent protection element (50N) of the corresponding intelligent electronic device are activated and delayed for a third predetermined time, and then a second trip signal is output to stop the power supply of the other distribution feeder where the accident occurs.

In one embodiment, the first predetermined time range is between 5 and 25 cycles.

In one embodiment, the second predetermined time range is between 3 and 15 cycles.

In one embodiment, the third predetermined time range is between 1 and 5 cycles.

In one embodiment, the protection logic planning includes: when an accident occurs in one of the distribution feeders, the instantaneous phase overcurrent protection element, instantaneous ground overcurrent protection element, delayed phase overcurrent protection element and delayed ground overcurrent protection element of the corresponding intelligent electronic device are activated and the protection coordination setting time is reached, a third trip signal is output to stop the distribution feeder where the accident occurs from supplying power.

In one embodiment, the power supply system further includes a plurality of distribution circuit breakers, which are arranged corresponding to the distribution feeders, each distribution circuit breaker is electrically connected to a corresponding smart electronic device, and each smart electronic device controls the corresponding distribution circuit breaker.

In one embodiment, the first trip signal or the second trip signal is transmitted to the corresponding smart electronic device, so that the smart electronic device cuts off the power supply of the corresponding distribution feeder through its corresponding distribution circuit breaker.

As mentioned above, in the protection logic planning and power supply system of the present invention that introduces the GOOSE application strategy, by introducing the GOOSE application strategy into the distribution level feeder protection terminal, a more complete protection mechanism can be achieved, thereby eliminating the over-level tripping problem caused by accidents occurring simultaneously or successively in a short period of time on two or more distribution feeders, making the power supply system more stable.

1: Power supply system

50N1: The first group of instantaneous ground overcurrent protection components

50N2: The second group of instantaneous ground overcurrent protection components

50P1: The first group of instantaneous phase-to-phase overcurrent protection components

50P2: The second group of instantaneous phase-to-phase overcurrent protection elements

51N1: The first group of delayed ground overcurrent protection elements

51P1: The first group of delayed phase-to-phase overcurrent protection elements

52A: Circuit breaker

AND1~AND5: AND gate

BUS: Bus

CB, CB1~CB5: distribution circuit breaker

CT, CT1~CT5: Current transformer

F0: Main feed line

F1~F5: power distribution feeder

GOOSE: Generic Object Oriented Substation Event

IED0, IED1~IED5: Intelligent electronic device

MCB: Main Circuit Breaker

OR1~OR4: OR gate

Rx: GOOSE receiving signal

t: time

t1: First scheduled time

t2: Second scheduled time

t3: The third scheduled time

T1~T3: Timer

Tr: Transformer

TRIP1: first trip signal

TRIP2: Second trip signal

TRIP3: The third trip signal

Tx: GOOSE transmission signal

Figure 1 is a single-line schematic diagram of a power supply system according to an embodiment of the present invention.

Figures 2A to 2C are schematic diagrams of different strategies for protection logic planning that introduce the GOOSE application strategy into the power supply system of Figure 1.

Figure 3 is a schematic diagram of the integrated protection logic planning of Figures 2A to 2C.

The following will refer to the relevant figures to illustrate the protection logic planning and power supply system of the GOOSE application strategy according to the embodiment of the present invention, in which the same components will be described with the same reference symbols.

Some of the terms, symbols, signals or codes that appear in this article or diagram should be understood by technicians familiar with the field of power supply and distribution technology.

The present invention introduces the GOOSE application strategy into the distribution level feeder protection electric pole to achieve a more complete protection mechanism, thereby eliminating the over-level tripping problem caused by accidents occurring simultaneously or successively in a short period of time on two or more distribution feeders, making the power supply system more stable.

The present invention can be applied to power distribution levels, such as but not limited to 11.95 kilovolt (kV) or 23.9kV feeder protection. The GOOSE application strategy can enhance the protection function of the power supply system, improve the upstream and downstream protection coordination, reduce the configuration of on-site hard lines, and achieve a faster and more stable protection method.

FIG1 is a single-line schematic diagram of a power supply system of an embodiment of the present invention, FIG2A to FIG2C are schematic diagrams of different strategies of protection logic planning of the GOOSE application strategy introduced into the power supply system of FIG1, and FIG3 is an integrated schematic diagram of the protection logic planning of FIG2A to FIG2C.

Please refer to FIG. 1 , the power supply system 1 may include a main feeder F0, a plurality of distribution feeders F1 to F5 of the same bus (e.g., the 11.95 kV BUS of FIG. 1 ), and a plurality of intelligent electronic devices IED1 to IED5. In addition, the power supply system 1 of the present embodiment may also include a transformer Tr, a main circuit breaker MCB, another intelligent electronic device IED0, a plurality of distribution circuit breakers CB1 to CB5, and a plurality of current transformers CT, CT1 to CT5. The power supply system 1 of the present embodiment can, for example but not limited to, convert 161kV into 11.95kV through a transformer Tr to supply power to five distribution feeders F1 to F5, but is not limited thereto. In different embodiments, the voltage of the power supply system 1 and the number of distribution feeders can vary according to actual conditions, for example, 69kV can be converted into 11.95kV, 22kV or 23.9kV, or other different higher voltages can be converted into lower voltages, and power can be supplied to less than or more than five distribution feeders, which are not limited by the present invention. In addition, the number of components shown in FIG. 1 is only an example and cannot be used to limit the present invention. In some power supply systems with a voltage of 11.95kV, the upper limit of the number of distribution feeders can be 10; in some power supply systems with a voltage of 23.9kV, the upper limit of the number of distribution feeders can be 8.

The distribution feeder F1~F5 is connected to the main feeder F0. Here, the distribution feeder F1~F5 is connected to the main feeder F0 through a bus BUS. In addition, the intelligent electronic device IED0 is set corresponding to the main feeder F0 and can control whether the main feeder F0 is powered. The main circuit breaker MCB is set on the main feeder F0 and is electrically connected to the intelligent electronic device IED0. The main circuit breaker MCB is used to control whether the main feeder F0 supplies power to the distribution feeder F1~F5; when the main circuit breaker MCB is disconnected (disconnected), the power supply to the distribution feeder F1~F5 is stopped. The current transformer CT is used to sense the current of the main feeder F0, thereby outputting the corresponding current signal and transmitting it to the intelligent electronic device IED0; the intelligent electronic device IED0 may include a protection stop. When the protection stop detects that the main feeder F0 reaches the preset current, voltage, frequency or time setting conditions, the intelligent electronic device IED0 can output the corresponding trip signal and transmit it to the main circuit breaker MCB, thereby disconnecting the power supply of the main feeder F0.

Each intelligent electronic device IED1~IED5 is respectively set in correspondence with each distribution feeder F1~F5 (one-to-one correspondence). Here, the intelligent electronic device IED0 and the intelligent electronic devices IED1~IED5, and the intelligent electronic devices IED1~IED5 can communicate with each other through the GOOSE function of the IEC 61850 communication protocol to transmit signals. In addition, each distribution circuit breaker CB1~CB5 is respectively set in correspondence with each distribution feeder F1~F5 (one-to-one correspondence). Among them, each distribution circuit breaker CB1~CB5 is respectively electrically connected to the corresponding intelligent electronic device IED1~IED5, and each distribution circuit breaker CB1~CB5 is used to control whether the corresponding distribution feeder F1~F5 is powered. When the intelligent electronic device IED1~IED5 outputs a control signal to notify the corresponding distribution circuit breaker CB1~CB5 to disconnect (disconnect), the corresponding distribution feeder F1~F5 will be disconnected and stop supplying power. In addition, each current transformer CT1~CT5 is used to sense the current of the corresponding distribution feeder F1~F5, thereby outputting the corresponding current signal and transmitting it to the corresponding intelligent electronic device IED1~IED5, so as to control the corresponding distribution feeder F1~F5 to disconnect and stop supplying power through the distribution circuit breaker CB1~CB5. In this embodiment, each intelligent electronic device IED1~IED5 includes a plurality of protection elements, which may include an instantaneous ground overcurrent protection element (abbreviated as 50N), a delayed ground overcurrent protection element (abbreviated as 51N), an instantaneous phase overcurrent protection element (abbreviated as 50P) and a delayed phase overcurrent protection element (abbreviated as 51P), so as to detect the fault current and output the corresponding pickup or trip signal when an accident occurs in the corresponding distribution feeder F1~F5.

The power supply system 1 of this embodiment has a protection logic plan that introduces the GOOSE application strategy, and the protection logic plan may include three GOOSE strategies. Among them, strategy 1 is: two of the distribution feeders F1~F5 have an accident at the same time, and the instantaneous phase overcurrent protection element (50P) and the instantaneous ground overcurrent protection element (50N) of the two corresponding intelligent electronic devices are started (pickup, detection signal), and after a first predetermined time t1, a first trip signal TRIP1 is output to stop the power supply of the two distribution feeders where the accident occurred. In addition, strategy 2 is: when an accident occurs in one of the distribution feeders F1~F5, the delayed phase overcurrent protection element (51P) and delayed ground overcurrent protection element (51N) of the corresponding intelligent electronic device are activated (trip signal is sent), so that the distribution feeder with the accident stops supplying power, and within a second predetermined time t2, another one of the distribution feeders of the same busbar also has an accident, and the instantaneous phase overcurrent protection element (50P) and instantaneous ground overcurrent protection element (50N) of the corresponding intelligent electronic device are started (pickup, detection signal) and after a delay of a third predetermined time t3, a second trip signal TRIP2 is output to stop the other distribution feeder with the accident from supplying power. In addition, strategy three is: when an accident occurs in one of the distribution feeders F1~F5, the instantaneous phase overcurrent protection element (50P1), instantaneous ground overcurrent protection element (50N1), delayed phase overcurrent protection element (51P1) and delayed ground overcurrent protection element (51N1) of the corresponding intelligent electronic device are started (pickup, detection signal) and the protection coordination setting time is reached, a third trip signal TRIP3 is output to stop the distribution feeder where the accident occurs from supplying power. The above "pickup" means: the action is detected but the setting time has not been reached, there is only a detection signal, no trip signal, and "action" means: the action is detected and the setting time has been reached, and there is a trip signal.

Please refer to FIG. 2A to FIG. 2C to explain the details of the above-mentioned strategies 1 to 3. First, in FIG. 2A to FIG. 2C, Rx represents the GOOSE receiving signal, Tx represents the GOOSE transmitting signal, 50P1 is the first group of instantaneous phase overcurrent protection elements, 50N1 is the first group of instantaneous ground overcurrent protection elements, 51P1 is the first group of delayed phase overcurrent protection elements, 51N1 is the first group of delayed ground overcurrent protection elements, 50P2 is the second group of instantaneous phase overcurrent protection elements, and 50N2 is the second group of instantaneous ground overcurrent protection elements. In addition, it should be understood that the two or more distribution feeders tripped in the following description are just examples. In different embodiments, the distribution feeders that tripped when an accident occurred may be different distribution feeders according to the actual situation.

Please refer to Figure 2A. The digital logic of strategy 1 may include an OR gate OR1, an AND gate AND1, and a timer T1. Here, the detection signals of 50P2/50N2 of the intelligent electronic devices IED2~IED5 are respectively connected to the four input terminals of the OR gate OR1, the output terminal of the OR gate OR1 is connected to the first input terminal of the AND gate AND1, and the second input terminal of the AND gate AND1 is connected to the detection signal of 50P2/50N2 of the intelligent electronic device IED1, and the output terminal of the AND gate AND1 is connected to the input terminal of the timer T1. When the output terminal of the AND gate AND1 is 1 and the timer T1 reaches the first predetermined time t1, the first trip signal TRIP1 can be output.

Specifically, assuming that the distribution feeder F3 and the distribution feeder F1 of the same bus have accidents at the same time, the detection signal of 50P2/50N2 of the intelligent electronic device IED3 is 1, and the detection signal of 50P2/50N2 of the intelligent electronic device IED1 is also 1, so the output end of the AND gate AND1 is 1 and after the first predetermined time t1, the first trip signal TRIP1 is output. The first trip signal TRIP1 can disconnect the two distribution feeders F1 and F3 where the accidents occurred and stop the power supply, and can also output the GROOSE trip alarm signal to notify personnel to pay attention. Here, the first trip signal TRIP1 can be transmitted to the intelligent electronic devices IED1 and IED3 at the same time, so that the intelligent electronic devices IED1 and IED3 can simultaneously operate (disconnect) through the corresponding distribution circuit breakers CB1 and CB3 to cut off the power supply of the distribution feeder lines F1 and F3. In this way, the problem of over-level tripping caused by accidents occurring on two (or more) distribution feeder lines at the same time can be eliminated. The aforementioned first predetermined time t1 can range from 5 to 25 cycles (Hz≦t1≦25Hz), for example but not limited to 6, 10, 15 or 20 cycles. It is worth noting that strategy 1 does not consider the original 51P1/51N1 protection coordination, and can immediately trip two or more distribution feeders that have accidents at the same time, and send a GOOSE trip alarm signal.

In addition, please refer to FIG. 2B , the digital logic of strategy 2 may include an OR gate OR2, an AND gate AND2, and two timers T2 and T3. Here, the trip (action) signal of 51P1/51N1 of the intelligent electronic device IED2~IED5 is respectively connected to the four input terminals of the OR gate OR2, the output terminal of the OR gate OR2 is connected to the input terminal of the timer T2, the output terminal of the timer T2 is connected to the first input terminal of the AND gate AND2, and the second input terminal of the AND gate is connected to the detection signal of 50P2/50N2 of the intelligent electronic device IED1, and the output terminal of the AND gate is connected to the input terminal of the timer T3. Among them, when a distribution feeder line trips due to an accident and the output of the OR gate OR2 is 1 and during the second predetermined time t2, for example, when the distribution feeder F1 also has an accident in a short period of time and generates the 50P2/50N2 detection signal of IED1, the output of the AND gate AND2 is 1 and continues to reach the third predetermined time t3, the second trip signal TRIP2 can be output.

Specifically, assuming that an accident occurs in the distribution feeder F2 and the trip (action) signal of 51P1/51N1 of the intelligent electronic device IED2 is 1 (the trip signal can disconnect the distribution feeder F2 and stop supplying power), the output of the OR gate OR2 is 1, and during the second predetermined time t2 (a relatively short time), the other distribution feeder F2 of the same bus is tripped. 1 also has an accident and generates a detection signal of 50P2/50N2 of IED1, then the output terminal of AND2 is 1 and continues to reach the third predetermined time t3, then the second trip signal TRIP2 is output, and the second trip signal TRIP2 can disconnect the distribution feeder F1 where the accident occurs and stop the power supply, and at the same time, the trip alarm can be output to notify personnel to pay attention. Here, the second trip signal TRIP2 can be transmitted to the intelligent electronic device IED1, so that the intelligent electronic device IED1 can cut off the power supply of the distribution feeder F1 through the distribution circuit breaker CB1. In this way, the problem of over-level tripping caused by accidents of two (or more) distribution feeders in a short period of time can be eliminated. The range of the second predetermined time t2 mentioned above may be, for example, between 3 and 15 cycles (3Hz≦t2≦15Hz), such as but not limited to 5, 7, 10 or 12 cycles. In some embodiments, the range of the third predetermined time t3 may be, for example, between 1 and 5 cycles (1Hz≦t3≦5Hz), such as but not limited to 1, 3 or 5 cycles. It is reminded that strategy 2 does not consider the original 51P1/51N1 protection coordination, and immediately trips two or more distribution feeders that have accidents in succession within a short period of time.

In addition, please refer to FIG. 2C , Strategy 3 is the protection logic planning of the existing distribution feeder. When an accident occurs in a distribution feeder, such as the distribution feeder F1, the instantaneous phase overcurrent protection element (50P1), the delayed phase overcurrent protection element (51P1), the instantaneous ground overcurrent protection element (50N1) and the delayed ground overcurrent protection element (51N1) of the intelligent electronic device IED1 are activated (signal detection) and the time set by the protection coordination is reached, the third tripping signal TRIP3 is output (the larger the detected current, the shorter the tripping time), so that the distribution feeder F1 where the accident occurs is disconnected and the power supply is stopped. The protection logic planning of existing power distribution feeder is well known to the technical personnel in this field, and no further explanation is given here. It can be understood that the accident of power distribution feeder F1 is just an example. In different embodiments, accidents may also occur in other power distribution feeders, and there is no limitation.

When the logic planning of the above three strategies is integrated, the protection logic planning shown in Figure 3 can be obtained. In addition to the above description, the first trip signal TRIP1 and the second trip signal TRIP2 can be input to the two input ends of the OR gate OR3, and the two input ends of the OR gate OR4 are connected to the output end of the OR gate OR3 and the third trip signal TRIP3. Therefore, as long as a trip signal (TRIP1, TRIP2 or TRIP3) is generated, the OR gate OR4 can output the trip signal to disconnect the corresponding distribution feeder. In addition, the two input ends of AND3 are respectively connected to the corresponding distribution circuit breaker CB (52A is the code of the circuit breaker state A contact, which is 1 when the circuit breaker is put into operation) of the intelligent electronic device IED1, and the two input ends of AND4 are respectively connected to the detection signal of 50P2/50N2 of the intelligent electronic device IED1 and the output end of AND3, and the output end of AND4 can output the GOOSE detection signal, and the output end of AND3 and the third trip signal TRIP3 are respectively connected to the two input ends of AND5, and the output end of AND5 can output the GOOSE trip signal. The technicians familiar with the field of power technology should understand the meaning of the other symbols in Figure 3.

In summary, in the protection logic planning and power supply system of the present invention that introduces the GOOSE application strategy, by introducing the GOOSE application strategy into the distribution level feeder protection terminal, a more complete protection mechanism can be achieved, thereby eliminating the over-level tripping problem caused by accidents occurring simultaneously or successively in a short period of time on two or more distribution feeders, making the power supply system more stable.

The above description is for illustrative purposes only and is not intended to be limiting. Any equivalent modifications or changes made to the invention without departing from the spirit and scope of the invention shall be included in the scope of the patent application attached hereto.

50N2: The second group of instantaneous ground overcurrent protection components

50P2: The second group of instantaneous phase-to-phase overcurrent protection elements

AND1: AND gate

IED1~IED5: Intelligent electronic device

OR1: OR gate

Rx: GOOSE receiving signal

t1: First scheduled time

T1: Timer

TRIP1: first trip signal

Tx: GOOSE transmits signal

Claims (12)

A protection logic planning that introduces GOOSE application strategy is applied to a power supply system, which includes a main feeder, multiple distribution feeders on the same bus, and multiple intelligent electronic devices. The main feeder is connected to the distribution feeders, and each intelligent electronic device is respectively set corresponding to each distribution feeder, and each intelligent electronic device controls whether each distribution feeder supplies power; wherein each intelligent electronic device includes an instantaneous ground overcurrent protection element, an instantaneous phase overcurrent protection element, a delayed ground overcurrent protection element, and a delayed phase overcurrent protection element; the protection logic planning includes: Two of the distribution feeders have an accident at the same time, and the instantaneous phase overcurrent protection elements and instantaneous ground overcurrent protection elements of the two corresponding intelligent electronic devices are activated, and after a first predetermined time, a first trip signal is output to stop the power supply of the two distribution feeders where the accident occurred; and When an accident occurs in one of the distribution feeders, the delayed phase overcurrent protection element and delayed ground overcurrent protection element of the corresponding intelligent electronic device are activated, so that the distribution feeder with the accident stops supplying power. Within a second predetermined time, another one of the distribution feeders also has an accident immediately, and the instantaneous phase overcurrent protection element and instantaneous ground overcurrent protection element of the corresponding intelligent electronic device are activated and delayed for a third predetermined time, and then a second trip signal is output to stop the power supply of the other distribution feeder with the accident. The protection logic plan as described in claim 1, wherein the first predetermined time range is between 5 and 25 cycles. The protection logic plan as described in claim 1, wherein the second predetermined time range is between 3 and 15 cycles. The protection logic plan as described in claim 1, wherein the third predetermined time range is between 1 and 5 cycles. The protection logic planning as described in claim 1 further includes: When an accident occurs in one of the distribution feeders, and the instantaneous phase overcurrent protection element, instantaneous ground overcurrent protection element, delayed phase overcurrent protection element and delayed ground overcurrent protection element of the corresponding intelligent electronic device are activated and the protection coordination setting time is reached, a third trip signal is output to stop the distribution feeder where the accident occurs from supplying power. A power supply system, comprising: a main feeder; multiple distribution feeders of the same busbar, connected to the main feeder; and multiple intelligent electronic devices, respectively arranged corresponding to the distribution feeders, each of which controls whether the distribution feeders are supplying power; each of which comprises an instantaneous ground overcurrent protection element, a delayed ground overcurrent protection element, an instantaneous phase-to-phase overcurrent protection element, and a delayed phase-to-phase overcurrent protection element; wherein the power supply system has a protection logic plan that introduces a GOOSE application strategy, and the protection logic plan comprises: Two of the distribution feeders have an accident at the same time, and the instantaneous phase overcurrent protection elements and instantaneous ground overcurrent protection elements of the two corresponding intelligent electronic devices are activated, and after a first predetermined time, a first trip signal is output to stop the power supply of the two distribution feeders where the accident occurred; and When an accident occurs in one of the distribution feeders, the delayed phase overcurrent protection element and delayed ground overcurrent protection element of the corresponding intelligent electronic device are activated, so that the distribution feeder with the accident stops supplying power. Within a second predetermined time, another one of the distribution feeders also has an accident immediately, and the instantaneous phase overcurrent protection element and instantaneous ground overcurrent protection element of the corresponding intelligent electronic device are activated and delayed for a third predetermined time, and then a second trip signal is output to stop the power supply of the other distribution feeder with the accident. A power supply system as described in claim 6, wherein the first predetermined time range is between 5 and 25 cycles. A power supply system as described in claim 6, wherein the second predetermined time range is between 3 and 15 cycles. A power supply system as described in claim 6, wherein the third predetermined time range is between 1 and 5 cycles. The power supply system as described in claim 6, wherein the protection logic planning further includes: When an accident occurs in one of the distribution feeders, and the instantaneous phase overcurrent protection element, instantaneous ground overcurrent protection element, delayed phase overcurrent protection element and delayed ground overcurrent protection element of the corresponding intelligent electronic device are activated and the protection coordination setting time is reached, a third trip signal is output to stop the distribution feeder where the accident occurs from supplying power. The power supply system as described in claim 6 further includes: A plurality of distribution circuit breakers, which are arranged corresponding to the distribution feeders, wherein each of the distribution circuit breakers is electrically connected to the corresponding intelligent electronic devices, and each of the intelligent electronic devices controls the corresponding distribution circuit breakers. A power supply system as described in claim 11, wherein the first trip signal or the second trip signal is transmitted to the corresponding intelligent electronic device, so that the intelligent electronic device cuts off the power supply of the corresponding distribution feeder through its corresponding distribution circuit breaker.

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