Power supply and distribution system for actively indicating action of subordinate circuit breaker based on superior circuit breaker

Abstract

The invention provides a power supply and distribution system based on a superior circuit breaker (UD) or a control center for actively indicating subordinate circuit breakers (DD) to act, which comprises the superior circuit breaker and a plurality of subordinate circuit breakers, the superior circuit breaker is communicated with the subordinate circuit breakers through a power line communication line, a UD indicating unit is arranged in the superior circuit breaker, and the subordinate circuit breakers are communicated with the subordinate circuit breakers. A DD receiving unit is arranged in the lower-stage circuit breaker; the UD indication unit of the upper-stage circuit breaker is used for detecting short circuit or leakage current, generating an action indication signal for indicating the action of the lower-stage circuit breaker, modulating the action indication signal into a power line communication signal, and sending the power line communication signal to the corresponding lower-stage circuit breaker through a power line communication line, so that the lower-stage circuit breaker with short circuit or leakage current fault in a protection range trips; the DD receiving unit of the subordinate circuit breaker is used for detecting short circuit or leakage current and receiving a power line communication signal, and drives the subordinate circuit breaker to trip after demodulation. The invention further discloses a corresponding control method.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breaker protection systems and safe power supply and distribution systems, and in particular to a power supply and distribution system based on an upper level circuit breaker actively indicating the action of a lower level circuit breaker. Background Art

[0002] In the power supply and distribution system, the coordination of the operating characteristics of two or more circuit breakers connected in series in the circuit should ensure that when a short circuit, overcurrent or leakage occurs within a given range, the circuit breaker designated to operate within this range will operate, while other circuit breakers will not operate. This is selective protection. Figure 1 As shown, there are usually two methods for selective protection of upper and lower circuit breakers:

[0003] The first is the action value selective coordination, and the second is the time selective coordination. The action value selective coordination means that the action value of the upper circuit breaker UD, such as short-circuit current, overcurrent, and leakage current, needs to be sufficiently larger than the action value of the lower circuit breaker DD of the branch line switch, so that the action value is below a certain value, and the protection characteristic curves of the upper and lower circuit breakers do not overlap, thereby achieving protection selectivity, that is, DD is disconnected and UD is not disconnected. The setting value of the residual current action protection device of the upper circuit breaker should be greater than 2 times the setting value of the lower residual current action protection device, and 3 times in engineering.

[0004] Time selective coordination means that when the protection action time of the upper circuit breaker is calculated with negative deviation (i.e. early action) and the protection action time of the lower circuit breaker is calculated with positive deviation (i.e. delayed action), the action time of the upper circuit breaker is still greater than the action time of the lower circuit breaker, which means that the requirements of selective coordination can be achieved. Usually, the action time of the upper and lower residual current protection devices should have a step difference of 100ms.

[0005] Figure 2 This is a common example of three-stage circuit breaker leakage protection coordination. It should be noted that the current standard term for leakage protection is residual current protection.

[0006] From the above overview, it can be seen that the current implementation of the coordination of the upper and lower circuit breakers is based on the active action of the circuit breakers at each level. However, in fact, due to the following reasons, the lower circuit breaker should act but does not act, and the upper circuit breaker acts and trips instead, or both the upper and lower circuit breakers act, resulting in an expansion of the scope of the accident. In extreme cases, the circuit breakers at all levels do not act.

[0007] 1. Improper coordination between the upper and lower circuit breakers, that is, the upper and lower circuit breakers do not adopt appropriate protection selectivity coordination.

[0008] 2. Problems with the circuit breaker itself. There is a certain probability of slow action, insufficient sensitivity, no action, and malfunction.

[0009] 3. Complexity of lines, short circuits and leakage.

[0010] For example: The current coordination mode of the upper and lower circuit breakers is that if a short circuit or leakage occurs somewhere within the protection range of the lower circuit breaker (taking leakage as an example below, the coordination principle of short circuit is the same), there are actually the following situations:

[0011] (1) The lower circuit breaker operates, but the upper circuit breaker does not operate

[0012] The leakage current is greater than or equal to the action value of the lower-level circuit breaker, but less than the action value of the upper-level circuit breaker. At this time, the lower-level circuit breaker trips and disconnects, while the upper-level circuit breaker does not operate. The leakage fault is limited to the protection range of the lower-level circuit breaker, achieving the preset ideal effect.

[0013] The leakage current is greater than or equal to the action value of the lower and upper circuit breakers (when leakage occurs, the leakage current rises quickly or the lower circuit breaker acts too slowly), but because the upper circuit breaker is set with a delayed action time, if the lower circuit breaker can trip and disconnect within the delayed action time of the upper circuit breaker, the upper circuit breaker does not act, and the preset effect can still be achieved.

[0014] (2) Both the lower and upper circuit breakers are actuated

[0015] The leakage current is greater than or equal to the action value of the lower and upper circuit breakers. The lower circuit breaker does not trip and disconnect within the delayed action time of the upper circuit breaker, while the upper circuit breaker trips and disconnects, causing the leakage accident to expand to the protection range of the upper circuit breaker, and failing to achieve the preset effect. Although the leakage fault is eliminated at this time, in addition to the expansion of the power-off range, it is very likely that the lower leakage has caused harm to people or equipment.

[0016] (3) Neither the lower nor the upper circuit breaker operates

[0017] The leakage current is greater than or equal to the action value of the lower and upper circuit breakers, but neither of them operates. At this time, the protection function of the upper circuit breaker is relied on to trip and disconnect the incoming line. This situation will not be described in detail. Summary of the invention

[0018] In order to overcome the lack and insufficiency of the selective protection of upper and lower level circuit breakers in the prior art, a power supply and distribution system based on the upper level circuit breaker actively indicating the action of the lower level circuit breaker and a control method for the power supply and distribution system are provided.

[0019] A first aspect of the present invention is to provide a power supply and distribution system based on an upper level circuit breaker actively indicating the action of a lower level circuit breaker, comprising:

[0020] An upper circuit breaker and a plurality of lower circuit breakers, wherein the upper circuit breaker and the plurality of lower circuit breakers are connected in series via a power line communication line (PLC line), a UD indicating unit is provided inside the upper circuit breaker, and a DD receiving unit is provided inside the plurality of lower circuit breakers;

[0021] The UD indication unit is used to receive its own short circuit or leakage current and generate an action indication signal for indicating the action of the lower-level circuit breaker based on the short circuit or leakage current, wherein the action indication signal is a modulated power line communication signal, and the power line communication signal is sent to the corresponding lower-level circuit breaker DD receiving unit through the power line communication line, so that the lower-level circuit breaker with a short circuit or leakage fault within the protection range is tripped;

[0022] The DD receiving unit is used to receive the power line communication signal of the upper circuit breaker, demodulate the power line communication signal, and then drive itself to perform a corresponding tripping action.

[0023] Preferably, the UD indication unit comprises:

[0024] A short circuit or residual current detection signal receiving unit, used for receiving the short circuit or leakage current of its own short circuit or residual current detection unit;

[0025] A first short-circuit or residual current magnitude determination unit, used to determine the magnitude of the short-circuit or leakage current;

[0026] A modulation action signal unit, used for generating an action indication signal for indicating the action of a lower-level circuit breaker based on the magnitude of the short-circuit or leakage current, wherein the action indication signal is a modulated power line communication signal;

[0027] The modulation action signal sending unit is used to send the power line communication signal to the DD receiving unit of the corresponding lower-level circuit breaker through the power line communication line.

[0028] Preferably, the DD receiving unit comprises:

[0029] A modulation action signal receiving unit, used for receiving the power line communication signal;

[0030] A demodulation action signal unit, used for demodulating the power line communication signal;

[0031] a second short circuit or residual current magnitude determination unit, configured to detect the short circuit or leakage current and determine the magnitude of the leakage current, and compare the magnitude of the short circuit or leakage current determined this time with the determination result of the first residual current magnitude determination unit;

[0032] The DD lower level circuit breaker action driving signal issuing unit is used to drive the lower level circuit breaker to perform a corresponding tripping action based on the demodulated power line communication signal under the condition that the comparison result is consistent.

[0033] Preferably, the upper circuit breaker and the multiple lower circuit breakers can be intelligent circuit breakers or non-intelligent circuit breakers. In addition to the original fault detection, judgment, amplification and driving units, the circuit breaker is also equipped with the UD indication unit or the DD receiving unit to achieve double tripping drive when a fault occurs.

[0034] Preferably, the power supply and distribution system also includes a control center, which detects in real time whether a short circuit occurs and the scope of the short circuit, or whether a leakage occurs and the scope of the leakage; the control center is used to form a dual control function with the upper-level circuit breaker.

[0035] Preferably, the dual control function includes: the control of the upper circuit breaker is priority control, and the control center is used to implement the control function when some or all units of the upper circuit breaker fail, or the action instruction signal issued by the upper circuit breaker cannot be sent to the corresponding lower circuit breaker.

[0036] Preferably, the dual control function includes: the control of the control center is backup control; the control center implements the control function based on real-time detection of whether a short circuit occurs and the scope of the short circuit, or whether a leakage occurs and the scope of the leakage, and the control instruction priority of the control center is lower than the action indication signal of the upper circuit breaker.

[0037] A second aspect of the present invention is to provide a control method for a power supply and distribution system based on an upper level circuit breaker actively indicating the action of a lower level circuit breaker, comprising:

[0038] S1, the upper circuit breaker and the lower circuit breaker both detect the short circuit or leakage current in real time, and determine that a short circuit or leakage occurs based on the magnitude of the short circuit or leakage current exceeding a threshold after the short circuit or leakage current detection;

[0039] S2, reporting the occurrence of a short circuit or leakage to the UD indicating unit of the upper circuit breaker and the DD receiving unit of the lower circuit breaker;

[0040] S3, detecting whether the upper circuit breaker trips, and if so, determining that the fault is eliminated; if not, instructing the lower circuit breaker to trip through the upper circuit breaker.

[0041] Preferably, S3 includes:

[0042] S31, the UD indication unit of the upper circuit breaker receives a short circuit or leakage current and generates an action indication signal for indicating an action of a lower circuit breaker based on the short circuit or leakage current;

[0043] S32, modulating the action instruction signal to generate a power line communication signal;

[0044] S33, sending the power line communication signal to the corresponding lower-level circuit breaker through the power line communication line, so that the lower-level circuit breaker with a short circuit or leakage fault within a protection range trips;

[0045] S34, receiving the power line communication signal of the upper circuit breaker and demodulating the power line communication signal;

[0046] S35, the DD receiving unit of the lower circuit breaker detects the short circuit or leakage current and determines the magnitude of the short circuit or leakage current, and compares the magnitude of the short circuit or leakage current determined this time with the determination result of the first residual current magnitude determination unit;

[0047] S36, based on the condition that the comparison result is consistent, driving the lower-level circuit breaker to perform a corresponding tripping action based on the demodulated power line communication signal.

[0048] Preferably, the control method further includes:

[0049] S4, start the control center and set its control level to backup control; the control center implements the control function based on real-time detection of whether a short circuit occurs and the scope of the short circuit, or whether a leakage occurs and the scope of the leakage, and the control instruction priority of the control center is lower than the action indication signal of the upper circuit breaker.

[0050] Beneficial effects of the present invention:

[0051] 1. When a short circuit or leakage occurs in the line, the upper-level circuit breaker takes the initiative to intervene and issue a command to disconnect the lower-level circuit breaker. The role of the upper-level circuit breaker is not just to wait, nor is it just to serve as a substitute for the action of the lower-level circuit breaker.

[0052] 2. The control center understands the occurrence and scope of short circuit and leakage, and can achieve dual control, that is, dual control by the control center and the upper circuit breaker, among which the control of the upper circuit breaker has priority.

[0053] 3. The solution of the present invention is also applicable to systems using intelligent circuit breakers. Current intelligent circuit breakers do not have the function of the upper level actively instructing the lower level to act.

[0054] 4. The upper and lower circuit breakers of the present invention have a dual fault protection structure.

[0055] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. The objects and features of the present invention will become more apparent in view of the following description in conjunction with the accompanying drawings, in which:

[0057] Figure 1 It is a schematic diagram of the structure of the selective protection principle of upper and lower level circuit breakers according to the prior art.

[0058] Figure 2 The figure is a schematic diagram of an example of circuit breaker coordination for residual current protection according to the prior art.

[0059] Figure 3 The schematic diagram of the structure of a power supply and distribution system based on an upper-level circuit breaker actively indicating the action of a lower-level circuit breaker according to an embodiment of the present invention.

[0060] Figure 4 The schematic structure diagram of the UD indication unit of the power supply and distribution system based on the upper circuit breaker actively indicating the action of the lower circuit breaker according to an embodiment of the present invention.

[0061] Figure 5 1 is a principle structure diagram of a DD receiving unit of a power supply and distribution system based on an upper level circuit breaker actively indicating the action of a lower level circuit breaker according to an embodiment of the present invention.

[0062] Figure 6 The present invention is a flow chart of a control method for a power supply and distribution system based on an upper-level circuit breaker actively instructing a lower-level circuit breaker to operate according to an embodiment of the present invention.

[0063] Figure 7 The invention discloses an upper level circuit breaker UD double fault protection structure of a power supply and distribution system based on an upper level circuit breaker actively indicating the action of a lower level circuit breaker according to an embodiment of the present invention.

[0064] Figure 8 The invention is a double fault protection structure of a lower level circuit breaker DD of a power supply and distribution system based on an upper level circuit breaker actively indicating the action of a lower level circuit breaker according to an embodiment of the present invention. DETAILED DESCRIPTION

[0065] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0066] Embodiment 1

[0067] like Figure 3 As shown, this embodiment provides a power supply and distribution system based on the upper circuit breaker actively indicating the lower circuit breaker to operate, including:

[0068] An upper level circuit breaker and a plurality of lower level circuit breakers, wherein the upper level circuit breaker and the plurality of lower level circuit breakers are connected in series via a power line communication line, a UD indicating unit is arranged inside the upper level circuit breaker, and a DD receiving unit is arranged inside the plurality of lower level circuit breakers.

[0069] The UD indication unit is used to receive its own short circuit or leakage current and generate an action indication signal for indicating the action of the lower-level circuit breaker based on the short circuit or leakage current, wherein the action indication signal is a modulated power line communication signal, and the power line communication signal is sent to the corresponding lower-level circuit breaker DD receiving unit through the power line communication line, so that the lower-level circuit breaker with a short circuit or leakage fault within the protection range is tripped;

[0070] The DD receiving unit is used to receive the power line communication signal of the upper circuit breaker, demodulate the power line communication signal, and then drive itself to perform a corresponding tripping action.

[0071] like Figure 4 As shown, as a preferred embodiment, the upper circuit breaker UD indication unit includes: a short circuit or residual current detection signal receiving unit, which is used to receive the short circuit or leakage current of its own short circuit or residual current detection unit;

[0072] A first short-circuit or residual current magnitude determination unit, used to determine the magnitude of the short-circuit or leakage current;

[0073] A modulation action signal unit, used for generating an action indication signal for indicating the action of a lower-level circuit breaker based on the magnitude of the short-circuit or leakage current, wherein the action indication signal is a modulated power line communication signal;

[0074] The modulation action signal sending unit is used to send the power line communication signal to the corresponding lower-level circuit breaker through the power line communication line.

[0075] like Figure 5 As shown, as a preferred embodiment, the lower level circuit breaker DD indication unit includes:

[0076] A modulation action signal receiving unit, used for receiving the power line communication signal;

[0077] A demodulation action signal unit, used for demodulating the power line communication signal;

[0078] a second short circuit or residual current magnitude determination unit, configured to detect the short circuit or leakage current and determine the magnitude of the leakage current, and compare the magnitude of the short circuit or leakage current determined this time with the determination result of the first residual current magnitude determination unit;

[0079] The lower level circuit breaker action driving unit is used to drive the lower level circuit breaker to perform a corresponding tripping action based on the demodulated power line communication signal under the condition that the comparison result is consistent.

[0080] As a preferred embodiment, the upper circuit breaker and the plurality of lower circuit breakers may be intelligent circuit breakers or non-intelligent ordinary circuit breakers. The following configuration is provided inside the intelligent circuit breaker and the non-intelligent ordinary circuit breaker: Figure 7 and Figure 8 The double fault protection structure shown.

[0081] As a preferred embodiment, the power supply and distribution system also includes a control center, which detects in real time whether a short circuit occurs and the scope of the short circuit, or whether a leakage occurs and the scope of the leakage; the control center is used to form a dual control function with the upper-level circuit breaker.

[0082] As a preferred implementation, the dual control function includes: the control of the upper circuit breaker is priority control, and the control center is used to implement the control function when some or all units of the upper circuit breaker fail, or the action instruction signal issued by the upper circuit breaker cannot be sent to the corresponding lower circuit breaker.

[0083] As a preferred implementation, the dual control function includes: the control of the control center is backup control; the control center implements the control function based on real-time detection of whether a short circuit occurs and the scope of the short circuit, or whether a leakage occurs and the scope of the leakage, and the control instruction priority of the control center is lower than the action indication signal of the upper circuit breaker.

[0084] Embodiment 2

[0085] like Figure 6 As shown, this embodiment provides a control method for a power supply and distribution system based on an upper level circuit breaker actively indicating the action of a lower level circuit breaker, including:

[0086] S1, the upper circuit breaker and the lower circuit breaker both detect the short circuit or leakage current in real time, and determine that a short circuit or leakage occurs based on the magnitude of the short circuit or leakage current exceeding a threshold after the short circuit or leakage current detection;

[0087] S2, reporting the occurrence of short circuit or leakage to both the upper circuit breaker and the lower circuit breaker;

[0088] S3, detecting whether the lower-level circuit breaker trips, and if so, determining that the fault is eliminated; if not, instructing the upper-level circuit breaker to trip the lower-level circuit breaker.

[0089] As a preferred implementation, S3 includes:

[0090] S31, the UD indication unit of the upper circuit breaker receives a short circuit or leakage current and generates an action indication signal for indicating an action of the lower circuit breaker based on the short circuit or leakage current;

[0091] S32, modulating the action instruction signal to generate a power line communication signal;

[0092] S33, sending the power line communication signal to the corresponding lower-level circuit breaker through the power line communication line, so that the lower-level circuit breaker with a short circuit or leakage fault within a protection range trips;

[0093] S34, receiving the power line communication signal of the upper circuit breaker and demodulating the power line communication signal

[0094] S35, the DD receiving unit of the lower circuit breaker detects the short circuit or leakage current and determines the magnitude of the short circuit or leakage current, and compares the magnitude of the short circuit or leakage current determined this time with the determination result of the first residual current magnitude determination unit;

[0095] S36, based on the condition that the comparison result is consistent, driving the lower-level circuit breaker to perform a corresponding tripping action based on the demodulated power line communication signal.

[0096] As a preferred implementation, the control method further includes:

[0097] S4, start the control center and set its control level to backup control; the control center implements the control function based on real-time detection of whether a short circuit occurs and the scope of the short circuit, or whether a leakage occurs and the scope of the leakage, and the control instruction priority of the control center is lower than the action indication signal of the first controller.

[0098] The working principle of the power supply and distribution system is: Figure 3-5 As shown in the figure, taking residual current protection (also often called leakage protection) as an example, when leakage occurs, leakage occurs within the protection range of the lower circuit breaker (DD), and the upper circuit breakers in series all receive information about leakage, that is, the residual current is too large. At this time, in order to ensure that only the lower circuit breaker trips, the upper circuit breaker (UD) actively instructs the lower circuit breaker to operate.

[0099] Although preferred embodiments of the present invention have been described, additional changes and modifications may be made to these embodiments by those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A power supply and distribution system based on the upper circuit breaker actively indicating the action of the lower circuit breaker, characterized in that: include: An upper circuit breaker and a plurality of lower circuit breakers, wherein the upper circuit breaker and the plurality of lower circuit breakers are connected in series via a power line communication line, a UD indicating unit is provided inside the upper circuit breaker, and a DD receiving unit is provided inside the plurality of lower circuit breakers; The UD indication unit is used to receive its own short circuit or leakage current and generate an action indication signal for indicating the action of the lower-level circuit breaker based on the short circuit or leakage current, wherein the action indication signal is a modulated power line communication signal, and the power line communication signal is sent to the corresponding lower-level circuit breaker DD receiving unit through the power line communication line, so that the lower-level circuit breaker with a short circuit or leakage fault within the protection range is tripped; The DD receiving unit is used to receive the power line communication signal of the upper circuit breaker, demodulate the power line communication signal and then drive the lower circuit breaker to perform a corresponding tripping action.

2. A power supply and distribution system based on the upper circuit breaker actively indicating the action of the lower circuit breaker according to claim 1, characterized in that: The UD indication unit comprises: A short circuit or residual current detection signal receiving unit, used for receiving its own short circuit or residual current; A first short-circuit or residual current magnitude determination unit, used to determine the magnitude of the short-circuit or leakage current; A modulation action signal unit, used for generating an action indication signal for indicating the action of a lower-level circuit breaker based on the magnitude of the short-circuit or leakage current, wherein the action indication signal is a modulated power line communication signal; The modulation action signal sending unit is used to send the power line communication signal to the DD receiving unit of the corresponding lower-level circuit breaker through the power line communication line.

3. A power supply and distribution system based on the upper circuit breaker actively indicating the action of the lower circuit breaker according to claim 2, characterized in that: The DD receiving unit comprises: An action signal receiving unit, configured to receive the power line communication signal; A demodulation action signal unit, used for demodulating the power line communication signal; a second short circuit or residual current magnitude determination unit, configured to detect the short circuit or leakage current and determine the magnitude of the leakage current, and compare the magnitude of the short circuit or leakage current determined this time with the determination result of the first residual current magnitude determination unit; The lower-level circuit breaker action driving signal issuing unit is used to drive the lower-level circuit breaker to perform a corresponding tripping action based on the demodulated power line communication signal under the condition that the comparison result is consistent.

4. A power supply and distribution system based on the upper circuit breaker actively indicating the action of the lower circuit breaker according to claim 3, characterized in that: The upper circuit breaker and the multiple lower circuit breakers can be intelligent circuit breakers or non-intelligent circuit breakers; in addition to the original fault detection, judgment, amplification and driving units, the circuit breaker is also equipped with a UD indication unit or a DD receiving unit to achieve double tripping drive when a fault occurs.

5. A power supply and distribution system based on the upper circuit breaker actively indicating the action of the lower circuit breaker according to claim 4, characterized in that: The power supply and distribution system also includes a control center, which detects in real time whether a short circuit occurs and the scope of the short circuit, or whether a leakage occurs and the scope of the leakage; the control center is used to form a dual control function with the first controller.

6. A power supply and distribution system based on the upper circuit breaker actively indicating the action of the lower circuit breaker according to claim 5, characterized in that: The dual control function includes: the control of the upper circuit breaker is priority control, and the control center is used to implement the control function when some or all units of the upper circuit breaker fail, or the action instruction signal issued by the upper circuit breaker cannot be sent to the corresponding lower circuit breaker.

7. A power supply and distribution system based on the upper circuit breaker actively indicating the action of the lower circuit breaker according to claim 6, characterized in that: The dual control function includes: the control of the control center is backup control; the control center implements the control function based on real-time detection of whether a short circuit occurs and the scope of the short circuit, or whether a leakage occurs and the scope of the leakage, and the control instruction priority of the control center is lower than the action indication signal of the upper circuit breaker.

8. A control method for a power supply and distribution system based on an upper level circuit breaker actively indicating the action of a lower level circuit breaker according to any one of claims 1 to 7, characterized in that: include: S1, the upper circuit breaker and the lower circuit breaker both detect the short circuit or leakage current in real time, and determine that a short circuit or leakage occurs based on the magnitude of the short circuit or leakage current exceeding a threshold after the short circuit or leakage current detection; S2, reporting the occurrence of a short circuit or leakage to the UD indicating unit of the upper circuit breaker and the DD receiving unit of the lower circuit breaker; S3, detecting whether the upper circuit breaker is tripped, and if so, determining that the fault is eliminated; If no tripping occurs, the upper circuit breaker is instructed to trip the lower circuit breaker.

9. A control method for a power supply and distribution system based on an upper level circuit breaker actively indicating the action of a lower level circuit breaker according to claim 8, characterized in that: The S3 includes: S31, the UD indication unit of the upper circuit breaker receives a short circuit or leakage current and generates an action indication signal for indicating an action of a lower circuit breaker based on the short circuit or leakage current; S32, modulating the action instruction signal to generate a power line communication signal; S33, sending the power line communication signal to the corresponding lower-level circuit breaker through the power line communication line, so that the lower-level circuit breaker with a short circuit or leakage fault within a protection range trips; S34, receiving the power line communication signal of the upper circuit breaker and demodulating the power line communication signal; S35, the DD receiving unit of the lower circuit breaker detects the short circuit or leakage current and determines the magnitude of the short circuit or leakage current, and compares the magnitude of the short circuit or leakage current determined this time with the determination result of the first residual current magnitude determination unit; S36, based on the condition that the comparison result is consistent, driving the lower-level circuit breaker to perform a corresponding tripping action based on the demodulated power line communication signal.

10. A control method for a power supply and distribution system based on an upper level circuit breaker actively indicating the action of a lower level circuit breaker according to claim 9, characterized in that: The control method further comprises: S4, start the control center and set its control level to backup control; the control center implements the control function based on real-time detection of whether a short circuit occurs and the scope of the short circuit, or whether a leakage occurs and the scope of the leakage, and the control instruction priority of the control center is lower than the action indication signal of the upper circuit breaker.

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