Power supply system and power distribution cabinet

Abstract

The utility model discloses a power supply system and a power distribution cabinet, which are used for automatically starting a generator to supply power when commercial power is cut off and improving the timeliness of power switching and the reliability of power supply. The power supply system comprises a mains supply, N generators, a plurality of intermediate relays and a plurality of time relays, the mains supply and the N generators are respectively connected with a load, each generator is correspondingly provided with a self-starting signal control circuit, and the self-starting signal control circuit of one of the N generators comprises an intermediate relay for detecting the power supply condition of the mains supply. And the self-starting signal control circuits of the other N-1 generators comprise time relays for detecting the power supply condition of the commercial power and intermediate relays for detecting the power supply conditions of other generators, wherein N is a natural number greater than 1.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, in particular to a power supply system and a power distribution cabinet. Background Art

[0002] With the increasing requirements for power supply reliability and continuity in industries such as finance, the Internet, and rail transit, important loads are usually equipped with multiple generator sets for emergency power supply in addition to the main power supply. If the main generator set fails, the backup generator set can be put into use.

[0003] However, currently when the city power is cut off, the generator set needs to be started manually, which leads to problems such as low power supply reliability and low timeliness. Utility Model Content

[0004] The utility model provides a power supply system and a power distribution cabinet, which are used to automatically start a generator to supply power when the city power is cut off, thereby improving the timeliness of power switching and the reliability of power supply.

[0005] In a first aspect, an embodiment of the utility model provides a power supply system, including: a mains supply, N generators, a plurality of intermediate relays and a plurality of time relays;

[0006] The mains power and the N generators are connected to loads respectively, and a self-starting signal control circuit is correspondingly arranged for each generator, and the self-starting signal control circuit of one of the N generators includes an intermediate relay for detecting the mains power supply condition, and the self-starting signal control circuits of the remaining N-1 generators include a time relay for detecting the mains power supply condition and an intermediate relay for detecting the power supply conditions of other generators, and N is a natural number greater than 1.

[0007] In the above power supply system, the mains power and N generators are respectively connected to the loads, and a self-starting signal control circuit is correspondingly set for each generator, and the self-starting signal control circuit of one of the generators includes an intermediate relay for detecting the mains power supply status. When the mains power is cut off, the normally closed point of the intermediate relay is closed, the self-starting signal control circuit of the generator is connected, and the generator starts to supply power to the load. The self-starting signal control circuits of the remaining N-1 generators include a time relay for detecting the mains power supply status and an intermediate relay for detecting the power supply status of other generators. When the mains power is cut off, the contacts of the time relay are de-energized and closed with a time delay. If the other generators do not start normally, the normally closed point of the intermediate relay for detecting the power supply status of other generators is closed, and at least one of the N-1 generators starts to supply power to the load.

[0008] The embodiment of the utility model realizes automatic starting of the generator to supply power to the load when the mains power is cut off through the cooperation of the intermediate relay and the time relay. Compared with the manual starting of the generator set when the mains power is cut off in the prior art, the generator is automatically started to supply power when the mains power is cut off, thereby improving the timeliness of power switching and the reliability of power supply.

[0009] In a possible implementation, the N generators include a main generator and N-1 backup generators;

[0010] The self-starting control circuit of the main generator includes an intermediate relay for detecting the mains power supply condition, and the self-starting signal control circuit of the standby generator includes a time relay for detecting the mains power supply condition and an intermediate relay for detecting the power supply condition of other generators.

[0011] In one possible implementation, the N-1 standby generators are divided into multiple levels according to the activation order, and the self-starting signal control circuit of the nth level standby generator includes a time relay for detecting the mains power supply status and n intermediate relays for detecting the power supply status of other generators, where n is a natural number greater than 1 and less than or equal to N-1.

[0012] In a possible implementation, the n intermediate relays for detecting power supply conditions of other generators include an intermediate relay for detecting power supply conditions of the main generator and n-1 intermediate relays for respectively detecting power supply conditions of the first n-1 levels of standby generators.

[0013] In the above power supply system, the self-starting signal control circuit of the main generator includes an intermediate relay for detecting the power supply of the mains. When the mains is off, the normally closed point of the intermediate relay is closed, the self-starting signal control circuit of the main generator is connected, and the main generator is started to supply power to the load. The self-starting signal control circuits of the N-1 standby generators include a time relay for detecting the power supply of the mains, an intermediate relay for detecting the power supply of the main generator, and n-1 intermediate relays for respectively detecting the power supply of the first n-1 levels of standby generators. When the mains is off, the contacts of the time relay are de-energized and closed with a time delay. In the case that the main generator fails to start, the N-1 standby generators The motors are started step by step in the activation sequence. Specifically, taking the nth level standby generator as an example, when the city power is cut off, the contacts of the time relay are de-energized and closed with a time delay. When the main generator and the first n-1 level standby generators are not started, the normally closed point of the intermediate relay that detects the power supply status of the main generator is closed, and the normally closed points of the n-1 intermediate relays that respectively detect the power supply status of the first n-1 level standby generators are also closed. At this time, the nth level standby generator is started to supply power to the load. In this way, if the previous level standby generator is started normally, other standby generators that are enabled after the standby generator will no longer be started, that is, only one generator is started to supply power to the load at the same time to save energy.

[0014] In one possible embodiment, the delay duration of the time relay included in the self-starting signal control circuit of the first-level standby generator is greater than the start-up duration of the main generator, and the delay duration of the time relay included in the self-starting signal control circuit of the subsequent-level standby generator is greater than the delay duration of the time relay included in the self-starting signal control circuit of the previous-level standby generator.

[0015] In one possible implementation, the difference between the delay duration of the time relay included in the self-starting signal control circuit of the subsequent standby generator and the delay duration of the time relay included in the self-starting signal control circuit of the previous standby generator is greater than the start-up duration of the previous standby generator.

[0016] In the above-mentioned power supply system, by setting the delay time of the time relay included in the self-starting signal control circuit of the subsequent standby generator and the difference between the delay time of the time relay included in the self-starting signal control circuit of the previous standby generator to be greater than the starting time of the previous standby generator, it is possible to avoid erroneous judgment that the previous generator did not start normally due to insufficient delay time.

[0017] In a possible implementation, the delay time of the time relay included in the self-starting signal control circuit of the n-th level standby generator is n times the preset time.

[0018] In a possible implementation manner, the preset duration is greater than a maximum startup duration of the N generators.

[0019] In the above-mentioned power supply system, by setting the delay time of the time relay included in the self-starting signal control circuit of the nth-level standby generator to n times the preset time, and the preset time is greater than the maximum starting time of N generators, it is possible to avoid misjudgment that the previous-level generator did not start normally due to insufficient delay time.

[0020] In a possible implementation manner, the mains power supply and the power supply line between each generator and the load include a switch assembly.

[0021] In a second aspect, an embodiment of the utility model provides a power distribution cabinet, which is powered by the power supply system provided in the first aspect of the embodiment of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic diagram of the structure of a power supply system provided in an embodiment of the utility model;

[0024] Figure 2 A schematic diagram of the structure of a self-starting signal control circuit of a generator provided by an embodiment of the utility model;

[0025] Figure 3 A schematic diagram of the structure of another power supply system provided by an embodiment of the utility model;

[0026] Figure 4 A schematic structural diagram of a self-starting signal control circuit for another generator provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the embodiments of the present invention, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present invention, “multiple” refers to two or more than two.

[0029] In the following, the terms "first", "second", and "first" are used for descriptive purposes only and should not be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", or "first" may explicitly or implicitly include one or more of the features.

[0030] Before introducing the power supply system and the power distribution cabinet provided by the embodiment of the utility model, in order to facilitate understanding, the technical background of the embodiment of the utility model is first introduced in detail below.

[0031] With the increasing requirements for power supply reliability and continuity in industries such as finance, the Internet, and rail transit, important loads are usually equipped with multiple generator sets for emergency power supply in addition to the main power supply. If the main generator set fails, the backup generator set can be put into use.

[0032] However, currently when the city power is cut off, the generator set needs to be started manually, which leads to problems such as low power supply reliability and low timeliness.

[0033] In view of this, an embodiment of the utility model provides a power supply system, including: AC power, N generators, multiple intermediate relays and multiple time relays, the AC power and the N generators are respectively connected to loads, a self-starting signal control circuit is correspondingly set for each generator, and the self-starting signal control circuit of one of the generators includes an intermediate relay for detecting the power supply status of the AC power. When the AC power is cut off, the normally closed point of the intermediate relay is closed, the self-starting signal control circuit of the generator is connected, and the generator starts to supply power to the load. The self-starting signal control circuits of the remaining N-1 generators include a time relay for detecting the power supply status of the AC power and an intermediate relay for detecting the power supply status of other generators. When the AC power is cut off, the contacts of the time relay are de-energized and closed with a time delay. If the other generators are not started normally, the normally closed point of the intermediate relay for detecting the power supply status of other generators is closed, and at least one of the N-1 generators starts to supply power to the load.

[0034] Through the cooperation of the intermediate relay and the time relay, the generator can be automatically started to supply power to the load when the city power is cut off, thereby improving the timeliness of power switching and the reliability of power supply.

[0035] After introducing the background technology of the embodiment of the utility model, the power supply system and the power distribution cabinet provided by the embodiment of the utility model are described in detail in combination with specific embodiments.

[0036] The utility model provides a power supply system, comprising: a mains power supply, N generators, a plurality of intermediate relays and a plurality of time relays;

[0037] The mains and N generators are connected to loads respectively, and a self-starting signal control circuit is set for each generator. The self-starting signal control circuit of one of the N generators includes an intermediate relay for detecting the mains power supply situation, and the self-starting signal control circuits of the remaining N-1 generators include a time relay for detecting the mains power supply situation and an intermediate relay for detecting the power supply situation of other generators, and N is a natural number greater than 1.

[0038] In one example, if Figure 1As shown, taking two generators as an example, in this power supply system, the AC power, generator 1 and generator 2 are connected to the loads respectively, and each generator is provided with a corresponding self-starting signal control circuit (not shown in the figure), KA1 is an intermediate relay for detecting the power supply of generator 1, KA2 is an intermediate relay for detecting the AC power supply, KT is a time relay for detecting the AC power supply, QF1 is the power supply incoming switch of generator 1, QF2 is the power supply incoming switch of generator 2, QF3 is the AC power incoming switch, and QF4 is the incoming switch after the power supplies of the two generators are switched.

[0039] like Figure 2 As shown, points F1 and F2 are connected in the self-starting signal control circuit of generator 1, and the self-starting signal control circuit of generator 1 includes an intermediate relay KA2 for detecting the mains power supply condition. Points F3 and F4 are connected in the self-starting signal control circuit of generator 2, and the self-starting signal control circuit of generator 2 includes a time relay KT for detecting the mains power supply condition and an intermediate relay KA1 for detecting the power supply condition of generator 1.

[0040] In another example, if Figure 3 As shown, taking three generators as an example, in the power supply system, the mains, generator 1, generator 2, and generator 3 are connected to the loads respectively, and each generator is provided with a corresponding self-starting signal control circuit (not shown in the figure), KA1 and KA2 are intermediate relays for detecting the power supply condition of generator 1, KA3 is an intermediate relay for detecting the power supply condition of generator 2, KA4 is an intermediate relay for detecting the mains power supply condition, KT1 and KT2 are time relays for detecting the mains power supply condition, QF1 is the power supply incoming line switch of generator 1, QF2 is the power supply incoming line switch of generator 2, QF3 is the power supply incoming line switch of generator 3, QF4 is the mains power incoming line switch, and QF5 is the incoming line switch after the three-way generator power supply is switched.

[0041] like Figure 4 As shown, points F1 and F2 are connected in the self-starting signal control circuit of generator 1, and the self-starting signal control circuit of generator 1 includes an intermediate relay KA4 for detecting the mains power supply condition; points F3 and F4 are connected in the self-starting signal control circuit of generator 2, and the self-starting signal control circuit of generator 2 includes a time relay KT1 for detecting the mains power supply condition and an intermediate relay KA1 for detecting the power supply condition of generator 1; points F5 and F6 are connected in the self-starting signal control circuit of generator 3, and the self-starting signal control circuit of generator 3 includes a time relay KT2 for detecting the mains power supply condition, an intermediate relay KA2 for detecting the power supply condition of generator 1, and an intermediate relay KA3 for detecting the power supply condition of generator 2.

[0042] It should be noted that the number of generators in the embodiment of the utility model can be N, where N is a natural number greater than 1. The above examples only take two generators and three generators as examples to illustrate the connection method of the generators, intermediate relays, and time relays in the power supply system provided in the embodiment of the utility model.

[0043] In a specific implementation, the N generators include a main generator and N-1 backup generators, for example, Figure 1 and Figure 3 Among the generators shown, generator 1 is the main generator and the other generators are standby generators, wherein the self-starting control circuit of the main generator includes an intermediate relay for detecting the mains power supply condition, and the self-starting signal control circuit of the standby generator includes a time relay for detecting the mains power supply condition and an intermediate relay for detecting the power supply condition of other generators.

[0044] In practical applications, in order to facilitate the management of each backup generator, N-1 backup generators can be divided into multiple levels according to the activation order. The self-starting signal control circuit of the n-th level backup generator includes a time relay for detecting the mains power supply and n intermediate relays for detecting the power supply conditions of other generators, n is a natural number greater than 1 and less than or equal to N-1, and the n intermediate relays for detecting the power supply conditions of other generators include an intermediate relay for detecting the power supply condition of the main generator and n-1 intermediate relays for respectively detecting the power supply conditions of the first n-1 levels of backup generators.

[0045] by Figure 3 For example, suppose Figure 3 The generator 1 shown is the main generator, the generator 2 is the first-level standby generator, and the generator 3 is the second-level standby generator. The self-starting signal control circuit of the first-level standby generator (generator 2) includes a time relay KT1 for detecting the mains power supply and an intermediate relay KA1 for detecting the power supply of the main generator. The self-starting signal control circuit of the second-level standby generator (generator 3) includes a time relay KT2 for detecting the mains power supply, an intermediate relay KA2 for detecting the power supply of the main generator, and an intermediate relay KA3 for detecting the power supply of the first-level generator.

[0046] In this way, if the previous level of standby generator starts normally, the other standby generators that are activated after this standby generator will no longer be started, that is, only one generator is started at the same time to supply power to the load, which can save energy.

[0047] In practical applications, the delay duration of the time relay can be set according to the start-up duration of the generator. Specifically, the delay duration of the time relay included in the self-starting signal control circuit of the first-level standby generator is greater than the start-up duration of the main generator, and the delay duration of the time relay included in the self-starting signal control circuit of the second-level standby generator is greater than the delay duration of the time relay included in the self-starting signal control circuit of the first-level standby generator.

[0048] When specifically setting the delay time of the time relay included in the self-starting signal control circuit of each level of standby generator, there are the following two implementation methods.

[0049] Implementation method 1: the difference between the delay time of the time relay included in the self-starting signal control circuit of the subsequent standby generator and the delay time of the time relay included in the self-starting signal control circuit of the previous standby generator is greater than the starting time of the previous standby generator.

[0050] Still Figure 3 Taking the example shown, assuming that the start-up time of the main generator (generator 1) is 60 seconds and the start-up time of generator 2 is 70 seconds, the delay time of time relay KT1 should be greater than the start-up time of the main generator, for example, it can be set to 65 seconds or 70 seconds, and the difference between the delay time of time relay KT2 and the delay time of time relay KT1 should be greater than the start-up time of generator 2. If the delay time of time relay KT1 is 65 seconds, the delay time of time relay KT2 should be greater than 135 seconds, for example, it can be set to 140 seconds or 145 seconds.

[0051] Embodiment 2: The delay time of the time relay included in the self-starting signal control circuit of the nth-level standby generator is n times of the preset time, wherein the preset time is greater than the maximum starting time of the N generators.

[0052] Still Figure 3 Taking the shown example, assuming that the start-up time of the main generator (generator 1) is 60 seconds, the start-up time of the first-level standby generator (generator 2) is 70 seconds, and the start-up time of the second-level standby generator (generator 3) is 65 seconds, the maximum start-up time of the three generators is 70 seconds, and the preset time can be set to be greater than 70 seconds. For example, the preset time is 75 seconds. At this time, the delay time of the time relay KT1 included in the self-starting signal control circuit of the first-level standby generator (generator 2) can be set to 1 times the preset time, that is, 75 seconds, and the delay time of the time relay KT2 included in the self-starting signal control circuit of the second-level standby generator (generator 3) can be set to 2 times the preset time, that is, 150 seconds.

[0053] By progressively setting the delay time of the time relay included in the self-starting signal control circuit of each level of standby generator, it is possible to avoid erroneous judgment that the previous level generator did not start normally due to insufficient delay time.

[0054] The structure of the power supply system provided by the embodiment of the utility model is described above. The principle of automatic starting of the generator when the mains power is cut off in the power supply system provided by the embodiment of the utility model is described below.

[0055] by Figure 1 and Figure 2 Taking the case of two generators as an example, generator 1 is a main generator and generator 2 is a standby generator. It is assumed that the start-up time of the main generator is 60 seconds and the delay time of the time relay KT is 70 seconds.

[0056] When the mains power supply is normal, the contacts of the time relay KT and the normally closed point of the intermediate relay KA2 are disconnected, and both the main generator and the standby generator do not work.

[0057] When the mains power is cut off, the intermediate relay KA2 detects the mains power cut, the normally closed point closes, the main generator self-starting signal control circuit takes effect, and the main generator starts.

[0058] When the city power is cut off, the contacts of time relay KT are closed after 70 seconds. The contacts of time relay KT and the normally closed points of intermediate relay KA1 are connected in series in the self-starting signal control circuit of the standby generator. If the main generator starts successfully within 60 seconds, the normally closed point of intermediate relay KA1 opens, and points F3 and F4 will not be conducted. Even if the contacts of time relay KT are closed after 70 seconds, points F3 and F4 will not be conducted, and the standby generator self-starting signal will not be issued, and the main generator will still be powered.

[0059] If the main generator fails and loses power during operation, and the city power is still in a power-off state, the contacts of the time relay KT are closed, and the normally closed point of the intermediate relay KA1 is closed, and the two points F3 and F4 are connected. The self-starting signal control circuit of the standby generator takes effect, and the standby generator start signal is issued. The standby generator starts to supply power to the load.

[0060] If the standby generator is running, the fault of the main generator is repaired, and the main generator is started, the intermediate relay KA1 detects the power supply of the main generator, its normally closed point is disconnected, and points F3 and F4 are disconnected. The standby generator automatically stops running and is powered by the main generator. The main and standby generators will not run at the same time.

[0061] If either the main or standby generator is running, the main power failure is repaired, and the main power supply is restored, the self-starting signal control circuits corresponding to the main generator and the standby generator will be disconnected, and the main generator or the standby generator will automatically stop running and switch to main power supply.

[0062] The power supply system provided by the embodiment of the utility model achieves the purpose of self-starting the main generator and the standby generator through the coordinated circuit of the intermediate relay and the time relay, and the two generators are given priority as the main generator and will not run at the same time to supply power to the load, thereby avoiding waste of generator resources.

[0063] by Figure 3 and Figure 4 Taking the case of the three generators shown as an example, generator 1 is the main generator, generator 2 is the first-level backup generator, and generator 3 is the second-level backup generator. It is assumed that the start-up time of the main generator is 60 seconds, the delay time of time relay KT1 is 70 seconds, the start-up time of the first-level backup generator is 70 seconds, and the delay time of time relay KT2 is 145 seconds.

[0064] When the mains power supply is normal, the contacts of time relay KT1, KT2 and the normally closed point of intermediate relay KA4 are disconnected, and the main generator, the first-level standby generator and the second-level standby generator do not work.

[0065] When the mains power is cut off, the intermediate relay KA4 detects the mains power cut, the normally closed point closes, the main generator self-starting signal control circuit takes effect, and the main generator starts.

[0066] When the city power is cut off, the contacts of time relay KT1 are closed after a delay of 70 seconds. The contacts of time relay KT1 and the normally closed points of intermediate relay KA1 are connected in series in the self-starting signal control circuit of the first-level standby generator. If the main generator starts successfully within 60 seconds, the normally closed point of intermediate relay KA1 opens, and points F3 and F4 will not be conducted. Even if the contacts of time relay KT1 are closed after 70 seconds, points F3 and F4 will not be conducted, and the self-starting signal of the first-level standby generator will not be issued, and the main generator will still be powered. Similarly, the normally closed point of intermediate relay KA2 opens, and points F5 and F6 will not be conducted. Even if the contacts of time relay KT2 are closed after 145 seconds, points F5 and F6 will not be conducted, and the self-starting signal of the second-level standby generator will not be issued, and the main generator will still be powered.

[0067] If the main generator fails and loses power during operation, and the city power is still in a power-off state, the contact of the time relay KT1 is closed, and the normally closed point of the intermediate relay KA1 is closed, and the two points F3 and F4 are connected, and the self-starting signal control circuit of the first-level standby generator takes effect, and the first-level standby generator start signal is issued, and the first-level standby generator starts to supply power to the load. At this time, because the main generator is powered off, the normally closed point of the intermediate relay KA2 is closed, but because the first-level standby generator is powered, the normally closed point of the intermediate relay KA3 is opened, and the two points F5 and F6 are still not connected, and the second-level standby generator self-starting signal will not be issued, and the power is supplied by the first-level standby generator.

[0068] If the first-level standby generator is running, the fault of the main generator is repaired, and the main generator is started, the intermediate relay KA1 detects the power supply of the main generator, its normally closed point is disconnected, and points F3 and F4 are disconnected. The first-level standby generator automatically stops running and is powered by the main generator. The main and first-level standby generators will not run at the same time.

[0069] If the first-level standby generator fails and loses power during operation, and the AC power and the main generator are still in a power-off state, the contacts of the time relay KT2 and the contacts of the intermediate relay KA2 are closed. At this time, the normally closed point of the intermediate relay KA3 is closed, and the two points F5 and F6 are connected. The self-starting signal control circuit of the second-level standby generator takes effect, and the starting signal of the second-level standby generator is issued. The second-level standby generator starts to supply power to the load.

[0070] If the second-level standby generator is running, the fault of the main generator is repaired, and the main generator is started, the intermediate relay KA2 detects the power supply of the main generator, its normally closed point is disconnected, and points F5 and F6 are disconnected. The second-level standby generator automatically stops running and is powered by the main generator. The main and second-level standby generators will not run at the same time.

[0071] If the second-level standby generator is running, the fault of the first-level standby generator is repaired, and the first-level standby generator is started, the intermediate relay KA3 detects the power supply of the first-level standby generator, its normally closed point is disconnected, and points F5 and F6 are disconnected. The second-level standby generator automatically stops running and is powered by the first-level standby generator. The first-level standby generator and the second-level standby generator will not run at the same time.

[0072] If any of the main generator, the first-level backup generator or the second-level backup generator is running, the main power failure is repaired and the main power supply is restored, the self-starting signal control circuits corresponding to the main generator, the first-level backup generator and the second-level backup generator will be disconnected, and the main generator, the first-level backup generator or the second-level backup generator will automatically stop running and switch to main power supply.

[0073] The power supply system provided by the embodiment of the utility model achieves the purpose of self-starting the main generator, the first-level backup generator and the second-level backup generator through the coordinated circuit of the intermediate relay and the time relay, and these three generators are given priority as the main generator and will not run at the same time to supply power to the load, avoiding waste of generator resources.

[0074] Based on the same utility model concept, an embodiment of the utility model provides a power distribution cabinet, and the power distribution cabinet is powered by the power supply system provided by the above embodiment of the utility model.

[0075] Obviously, those skilled in the art can 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 system, characterized in that: include: Mains power, N generators, multiple intermediate relays and multiple time relays; The mains power and the N generators are connected to loads respectively, and a self-starting signal control circuit is correspondingly arranged for each generator, and the self-starting signal control circuit of one of the N generators includes an intermediate relay for detecting the mains power supply condition, and the self-starting signal control circuits of the remaining N-1 generators include a time relay for detecting the mains power supply condition and an intermediate relay for detecting the power supply conditions of other generators, and N is a natural number greater than 1.

2. The system according to claim 1, characterized in that The N generators include one main generator and N-1 standby generators; The self-starting control circuit of the main generator includes an intermediate relay for detecting the mains power supply condition, and the self-starting signal control circuit of the standby generator includes a time relay for detecting the mains power supply condition and an intermediate relay for detecting the power supply condition of other generators.

3. The system according to claim 2, characterized in that The N-1 standby generators are divided into multiple levels according to the activation order. The self-starting signal control circuit of the nth level standby generator includes a time relay for detecting the mains power supply status and n intermediate relays for detecting the power supply status of other generators, where n is a natural number greater than 1 and less than or equal to N-1.

4. The system according to claim 3, characterized in that The n intermediate relays for detecting the power supply conditions of other generators include an intermediate relay for detecting the power supply condition of the main generator and n-1 intermediate relays for respectively detecting the power supply conditions of the first n-1 levels of standby generators.

5. The system according to claim 3, characterized in that The delay duration of the time relay included in the self-starting signal control circuit of the first-level standby generator is greater than the starting duration of the main generator, and the delay duration of the time relay included in the self-starting signal control circuit of the subsequent-level standby generator is greater than the delay duration of the time relay included in the self-starting signal control circuit of the previous-level standby generator.

6. The system according to claim 5, characterized in that The difference between the delay time of the time relay included in the self-starting signal control circuit of the subsequent standby generator and the delay time of the time relay included in the self-starting signal control circuit of the previous standby generator is greater than the starting time of the previous standby generator.

7. The system according to claim 5, characterized in that The delay time of the time relay included in the self-starting signal control circuit of the nth-level standby generator is n times the preset time.

8. The system according to claim 7, characterized in that The preset duration is greater than the maximum startup duration of the N generators.

9. The system according to any one of claims 1 to 8, characterized in that: The mains power supply and the power supply lines between each generator and the load all include switch components.

10. A power distribution cabinet, characterized in that: The power distribution cabinet is powered by a power supply system according to any one of claims 1 to 9.

Images