A load cut-off control system for a generator distribution cabinet and a ship

Abstract

The embodiment of the present invention discloses a load cut-off control system for a generator distribution cabinet and a ship. The system comprises a plurality of time relays which are connected in parallel and connected in series with a generator load detection circuit through normally open contacts. The timing times set by the plurality of time relays are increased in sequence. After detecting that the generator load reaches 100%, the corresponding loads under control are de-energized according to the set timing times. The plurality of intermediate relays are respectively connected in series with the timing contacts of the corresponding time relays. When the timing time is reached, the corresponding timing contacts are closed, so that the intermediate relay connected in series with the timing contacts is energized, and the load to be unloaded which is electrically connected with the intermediate relay is de-energized. The load to be unloaded comprises at least a load electrically connected with the intermediate relay through a tripping coil, a load controlled by a motor intelligent module or a PLC which is electrically connected with the normally closed contacts of the intermediate relay, and a load powered by a distribution board or a control cabinet which powers other systems.

Description

Technical Field

[0001] The invention relates to the technical field of generator power distribution load control, in particular to a generator power distribution cabinet load cut-off control system and a ship. Background Art

[0002] When the generator load reaches the maximum load capacity of 100%, in order to ensure the safe and stable operation of the power system, the circuit breaker priority tripping function is usually used to automatically remove a relatively unimportant part of the system power, so as to ensure the normal operation of the power grid. Priority tripping usually unloads the load in order of importance. The priority tripping method is usually that the switch has a shunt tripping function, and the coil is energized to disconnect the switch and remove the unimportant load.

[0003] Due to the various and complex forms of power distribution networks, such as the distribution board connected to the secondary circuit distribution board, or connected to other system control cabinets, and also directly connected to the motor load, the currently designed priority disconnection forms are relatively uniform. One form is to achieve priority tripping through the shunt tripping function of the circuit breaker, and the other form is to achieve it through the AC contactor or intermediate relay connected to the normally closed contact. However, there is currently no solution to fundamentally solve the problem of how to flexibly implement the two forms of priority disconnection in the distribution cabinet according to specific circumstances.

[0004] Since the distribution network of the cruise ship electrical system is diverse and highly complex, it is necessary to optimize the design of the priority cut-off of the generator to meet the needs of different loads. Summary of the invention

[0005] In view of the above-mentioned problems existing in the prior art, an embodiment of the present invention provides a load cutting control system for a generator distribution cabinet and a ship, which, through the coordinated use of time relays and intermediate relays, can realize flexible priority cutting off of loads to be unloaded with different priorities and different types, thereby meeting the demand for graded cutting off of different loads.

[0006] An embodiment of the present invention provides a load shedding control system for a generator distribution cabinet, comprising:

[0007] A plurality of time relays, which are connected in parallel and in series with a generator load detection circuit through a normally open contact, and the timing times set by the plurality of time relays are increased in sequence, so that after the generator load detection circuit detects that the generator load reaches 100%, the corresponding loads under control are de-energized according to the set timing times;

[0008] A plurality of intermediate relays, each intermediate relay is connected in series with the timing contact of the corresponding time relay, and each time relay is connected in series with at least one intermediate relay;

[0009] Among them, when the timing time of the time relay is reached, the timing time contact corresponding to the relay whose timing time is reached is closed, thereby energizing the intermediate relay connected in series with the timing time contact, so that the energized intermediate relay cuts off the power to the load to be unloaded that is electrically connected to it, and the load to be unloaded includes at least a load electrically connected to the intermediate relay through a tripping coil, a load controlled by a motor intelligent module or PLC electrically connected to the normally closed contact of the intermediate relay, and a load powered by a distribution board or a control cabinet that supplies power to other systems, and the distribution board or the control cabinet that supplies power to other systems is electrically connected to the intermediate relay through a tripping coil.

[0010] In some embodiments of the present invention, if the load electrically connected to the intermediate relay via the tripping coil is specifically a load electrically connected to the intermediate relay via a load circuit shunt tripping coil, then,

[0011] The normally open contact of the intermediate relay is connected in series with the load circuit shunt tripping coil. After the intermediate relay is energized, the normally open contact of the intermediate relay is closed, so that the load circuit shunt tripping coil connected in series with the normally open contact of the intermediate relay is energized, thereby unloading the load electrically connected to the load circuit shunt tripping coil.

[0012] In some embodiments of the present invention, if the load electrically connected to the intermediate relay via the trip coil is specifically a load electrically connected to the intermediate relay via an undervoltage trip coil, then,

[0013] The normally closed contact of the intermediate relay is connected in series with the undervoltage tripping coil. After the intermediate relay is energized, the normally closed contact of the intermediate relay is disconnected, causing the undervoltage tripping coil connected in series with the normally closed contact of the intermediate relay to lose power, thereby unloading the load electrically connected to the undervoltage tripping coil.

[0014] In some embodiments of the present invention, if the load to be unloaded is a load controlled by a motor intelligent module or a PLC that is electrically connected to a normally closed contact of an intermediate relay, then,

[0015] After the intermediate relay is energized, the normally closed contact is disconnected, so that the motor intelligent module or PLC input point electrically connected to the normally closed contact is powered off, thereby unloading the load controlled by the motor intelligent module or the PLC.

[0016] In some embodiments of the present invention, if the load to be unloaded is a load powered by a distribution panel or a power supply control cabinet for other systems, and the distribution panel or the power supply control cabinet for other systems is electrically connected to the intermediate relay through the load circuit shunt tripping coil, then,

[0017] The normally open contact of the intermediate relay is connected in series with the load circuit shunt trip coil. After the intermediate relay is energized, the normally open contact of the intermediate relay closes, so that the load circuit shunt trip coil connected in series with the normally open contact of the intermediate relay is energized, thereby cutting off power to the distribution board or the control cabinet that supplies power to other systems.

[0018] In some embodiments of the present invention, when the distribution board or the control cabinet supplying power to other systems is electrically connected to the intermediate relay through the load circuit shunt trip coil, a protection diode is arranged in parallel at both ends of the load circuit shunt trip coil, and the protection diode is specifically a reverse diode.

[0019] In some embodiments of the present invention, if the load to be unloaded is a load powered by a distribution panel or a power supply control cabinet for other systems, and the distribution panel or the power supply control cabinet for other systems is electrically connected to the intermediate relay through an undervoltage trip coil, then,

[0020] The normally closed contact of the intermediate relay is connected in series with the undervoltage tripping coil. After the intermediate relay is energized, the normally closed contact of the intermediate relay is disconnected, causing the undervoltage tripping coil connected in series with the normally closed contact of the intermediate relay to lose power, thereby cutting off power to the distribution board or the control cabinet that supplies power to other systems.

[0021] In some embodiments of the present invention, the generator load detection circuit is also electrically connected to an intermediate relay, and is electrically connected to a PLC input point through a normally closed contact of the intermediate relay, so that when the generator load detection circuit detects that the generator load reaches 90%, an alarm signal is issued through PLC control.

[0022] In some embodiments of the present invention, the number of intermediate relays connected to each of the time relays is determined based on the type of load to be unloaded that needs to be unloaded in the circuit where the time relay is located.

[0023] An embodiment of the present invention further provides a ship, which adopts the load shedding control system of the generator distribution cabinet as described in the above embodiment to control the power generation system where the emergency generator is located.

[0024] Compared with the prior art, the beneficial effects of the generator distribution cabinet load cut-off control system and the ship provided by the embodiments of the present invention are: through the coordinated use of time relays and intermediate relays, it can realize flexible priority cut-off of loads to be unloaded with different priorities and different types, and meet the needs of graded cut-off of different loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1It is a schematic diagram of the electrical connection between the time relay and the generator load detection circuit in the load cut-off control system of the generator distribution cabinet according to an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of electrical connection between an intermediate relay and a time relay in a load shedding control system for a generator distribution cabinet according to an embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of an intermediate relay in a load shedding control system of a generator distribution cabinet according to an embodiment of the present invention being electrically connected to a motor intelligent module or a PLC controlling a running load through a normally closed contact;

[0028] Figure 4 A schematic diagram of an intermediate relay of a load cut-off control system of a generator distribution cabinet according to an embodiment of the present invention being electrically connected to a distribution panel or a control cabinet for power supplying other systems through a normally open contact via a load circuit shunt tripping coil;

[0029] Figure 5 Another schematic diagram of an intermediate relay of a load cut-off control system of a generator distribution cabinet according to an embodiment of the present invention being electrically connected to a distribution panel or a control cabinet for power supplying other systems through a normally open contact via a load circuit shunt tripping coil;

[0030] Figure 6 It is a schematic diagram of an intermediate relay of a load cut-off control system of a generator distribution cabinet according to an embodiment of the present invention being electrically connected to a distribution board or a control cabinet for power supplying other systems through a normally closed contact via an undervoltage tripping coil;

[0031] Figure 7 It is a circuit diagram of the intermediate relay in the load shedding control system of the generator distribution cabinet according to an embodiment of the present invention when the generator load is 90% and 100%. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0034] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0035] It should also be understood that, although the present application has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present application that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0036] The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.

[0037] Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments applied for are merely examples of the present application, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to determine the true intent based on the user's historical operations and to avoid unnecessary or redundant details that make the present application unclear. Therefore, the specific structural and functional details applied for herein are not intended to be limiting, but are merely used as the basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any suitable detailed structure.

[0038] This specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present application.

[0039] When designing the power supply system of the emergency generator, a priority cut-off design can be used to meet the priority cut-off of the distribution box circuit for different loads. The embodiment of the present invention provides a generator distribution cabinet load cut-off control system, such as Figures 1 to 7 As shown, it includes multiple time relays and multiple intermediate relays. After the multiple time relays are connected in parallel, they are connected in series with the generator load detection circuit through the normally open contacts, and the timing times set by the multiple time relays are increased in sequence, such as Figure 1 As shown, when there are three time relays, they can be 2 seconds, 4 seconds, and 6 seconds respectively, so that after the generator load detection circuit detects that the generator load has reached 100%, the corresponding load under control is de-energized according to the set timing time; each of the multiple intermediate relays is connected in series with the timing time contact of the corresponding time relay, each time relay is connected in series with at least one intermediate relay, and when a time relay is connected in series with multiple intermediate relays, the multiple intermediate relays connected in series are all arranged in parallel, as shown in FIG. Figure 2As shown, it shows a circuit diagram in which three intermediate relays are connected in parallel and in series with a time relay with a timing time of 2 seconds; wherein, when the timing time of the time relay is reached, the timing time contact corresponding to the relay whose timing time is reached is closed, thereby energizing the intermediate relay connected in series with the timing time contact, so that the energized intermediate relay cuts off the power to the load to be unloaded which is electrically connected to it. The load to be unloaded includes at least a load electrically connected to the intermediate relay through a tripping coil, a load controlled by a motor intelligent module or PLC electrically connected to the normally closed contact of the intermediate relay, and a load powered by a distribution board or a power supply control cabinet for other systems. The distribution board or the power supply control cabinet for other systems is electrically connected to the intermediate relay through a tripping coil, thereby realizing the function of flexibly cutting off different forms of distribution loads and according to priority etc. for the power supply network of the generator distribution cabinet.

[0040] In this embodiment, the number of intermediate relays connected to each of the time relays can be determined based on the type of load to be unloaded in the circuit where the time relay is located. Specifically, the timing time of one time relay is 2 seconds, and the timing time of one time relay is 4 seconds. The number of intermediate relays connected to the two time relays with timing times of 2 seconds and 4 seconds respectively needs to be determined according to the type of load to be unloaded in the circuit where the single time relay is located. As an example, if there are two types of loads to be unloaded connected in the circuit where the time relay with a timing time of 2 seconds is located, such as a load electrically connected to the intermediate relay through a tripping coil, and a load controlled by a motor intelligent module or PLC electrically connected to the normally closed contact of the intermediate relay, then the time relay with a timing time of 2 seconds can be connected to two intermediate relays arranged in parallel, and the two intermediate relays can be used to realize the unloading of the two different loads. Electrical connection and unloading of loads. If there is only one type of load to be unloaded connected in the circuit where the time relay with a timing time of 4 seconds is located, such as a load electrically connected to the intermediate relay through a tripping coil, then the corresponding intermediate relay is only one type. Of course, in actual use, the above-mentioned time relay and intermediate relay can be made into a module together. In order to make the module better suitable for the actual working environment during actual use, reduce the need to select different modules according to the types of loads to be unloaded on site, and need to be equipped with multiple modules, each time relay can be electrically connected to three intermediate relays arranged in parallel at the same time, so as to realize that the module can be directly applied to circuits with different priorities and at least one type of load to be unloaded in each priority. It only needs to determine the type of load to be unloaded when the corresponding time relay reaches the timing time, and then select the corresponding intermediate relay for electrical connection.

[0041] In some embodiments of the present invention, if the load electrically connected to the intermediate relay through the trip coil is specifically a load electrically connected to the intermediate relay through a load circuit shunt trip coil, then the normally open contact of the intermediate relay is connected in series with the load circuit shunt trip coil. After the intermediate relay is energized, the normally open contact of the intermediate relay is closed, so that the load circuit shunt trip coil connected in series with the normally open contact of the intermediate relay is energized, thereby unloading the load electrically connected to the load circuit shunt trip coil.

[0042] Further, in this embodiment, if the load electrically connected to the intermediate relay through the trip coil is specifically a load electrically connected to the intermediate relay through an undervoltage trip coil, then the normally closed contact of the intermediate relay is connected in series with the undervoltage trip coil. After the intermediate relay is energized, the normally closed contact of the intermediate relay is disconnected, causing the undervoltage trip coil connected in series with the normally closed contact of the intermediate relay to lose power, thereby unloading the load electrically connected to the undervoltage trip coil.

[0043] In some embodiments of the present invention, if the load to be unloaded is a load controlled by a motor intelligent module or PLC electrically connected to the normally closed contact of an intermediate relay, then, after the intermediate relay is energized, the normally closed contact is disconnected so that the motor intelligent module or PLC input point electrically connected to the normally closed contact is powered off, thereby unloading the load controlled by the motor intelligent module or PLC. The motor intelligent module or PLC is used to control the operation of the corresponding load. After the power supply of the motor intelligent module or PLC is cut off, the motor intelligent module or PLC is in a power-off and stopped working state, thereby causing the corresponding load under control to stop working, thereby achieving the purpose of unloading the load. Figure 3 As shown, contacts X2-9 and X2-10 of DI9 are electrically connected to the motor intelligent module or PLC input point through normally closed contacts.

[0044] In some embodiments of the present invention, if the load to be unloaded is a load powered by a distribution panel or a control cabinet for power supplying other systems, and the distribution panel or the control cabinet for power supplying other systems are electrically connected to the intermediate relay through a load circuit shunt trip coil, then the normally open contact of the intermediate relay is connected in series with the load circuit shunt trip coil. After the intermediate relay is energized, the normally open contact of the intermediate relay closes, so that the load circuit shunt trip coil connected in series with the normally open contact of the intermediate relay is energized, thereby de-energizing the distribution panel or the control cabinet for power supplying other systems.

[0045] Furthermore, in this embodiment, when the distribution panel or the control cabinet that supplies power to other systems is electrically connected to the intermediate relay through the load circuit shunt trip coil, since the load circuit shunt trip coil can store energy, if the load circuit shunt trip coil is directly powered off, a large voltage will be generated at both ends of the load circuit shunt trip coil, which will cause damage to the load circuit shunt trip coil or cause the components connected to it to be broken down. Therefore, a protection diode is connected in parallel at both ends of the load circuit shunt trip coil to generate a circuit (equivalent to connecting a short-circuit line at both ends of the load circuit shunt trip coil when the power is off) to discharge the energy stored in the load circuit shunt trip coil. Specifically, the protection diode is a reverse diode. Specifically, in Figure 5 In the circuit, a protection diode can be connected at the contacts corresponding to C1 and C2 to form a protection circuit.

[0046] In some embodiments of the present invention, if the load to be unloaded is a load powered by a distribution panel or a control cabinet for power supplying other systems, and the distribution panel or the control cabinet for power supplying other systems are electrically connected to the intermediate relay through an undervoltage trip coil, then the normally closed contact of the intermediate relay is connected in series with the undervoltage trip coil. After the intermediate relay is energized, the normally closed contact of the intermediate relay is disconnected, causing the undervoltage trip coil connected in series with the normally closed contact of the intermediate relay to lose power, thereby cutting off power to the distribution panel or the control cabinet for power supplying other systems.

[0047] In addition, in some embodiments of the present invention, the generator load detection circuit is also electrically connected to an intermediate relay, and is electrically connected to a PLC input point through a normally closed contact of the intermediate relay, so that when the generator load detection circuit detects that the generator load reaches 90%, an alarm signal, such as an audible and visual alarm, is issued through PLC control to prompt that the current generator load has reached a threshold value, prompting relevant operators to pay attention. For details, see Figure 7 As shown, when the generator load reaches 90%, 1STEP is executed to give an audible and visual alarm, and when the generator load reaches 100%, 2STEP is executed, that is, the normally open contacts in series are closed.

[0048] It can be seen from the above technical solution that the load cut-off control system of the generator distribution cabinet can realize flexible priority cut-off of loads of different priorities and types to be unloaded through the coordinated use of time relays and intermediate relays, thereby meeting the needs of graded cut-off of different loads.

[0049] An embodiment of the present invention also provides a ship, which adopts the generator distribution cabinet load shedding control system as described in the above embodiment to control the power generation system where the emergency generator is located, and the ship has all the beneficial effects of the above-mentioned generator distribution cabinet load shedding control system.

[0050] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A load cut-off control system for a generator distribution cabinet, characterized in that: include: A plurality of time relays, which are connected in parallel and in series with a generator load detection circuit through a normally open contact, and the timing times set by the plurality of time relays are increased in sequence, so that after the generator load detection circuit detects that the generator load reaches 100%, the corresponding loads under control are de-energized according to the set timing times; A plurality of intermediate relays, each intermediate relay is connected in series with the timing contact of the corresponding time relay, and each time relay is connected in series with at least one intermediate relay; Wherein, when the timing time of the time relay is reached, the timing time contact corresponding to the relay whose timing time is reached is closed, thereby energizing the intermediate relay connected in series with the timing time contact, so that the energized intermediate relay cuts off the power to the load to be unloaded which is electrically connected to it, and the load to be unloaded includes at least a load electrically connected to the intermediate relay through a tripping coil, a load controlled by a motor intelligent module or PLC electrically connected to the normally closed contact of the intermediate relay, and a load powered by a distribution board or a control cabinet for power supplying other systems, and the distribution board or the control cabinet for power supplying other systems is electrically connected to the intermediate relay through a tripping coil; If the load electrically connected to the intermediate relay via the tripping coil is specifically a load electrically connected to the intermediate relay via the load circuit shunt tripping coil, then, The normally open contact of the intermediate relay is connected in series with the load circuit shunt tripping coil. After the intermediate relay is energized, the normally open contact of the intermediate relay is closed, so that the load circuit shunt tripping coil connected in series with the normally open contact of the intermediate relay is energized, and the load electrically connected to the load circuit shunt tripping coil is unloaded; or, If the load electrically connected to the intermediate relay via the tripping coil is specifically a load electrically connected to the intermediate relay via an undervoltage tripping coil, then, The normally closed contact of the intermediate relay is connected in series with the undervoltage tripping coil. After the intermediate relay is energized, the normally closed contact of the intermediate relay is disconnected, so that the undervoltage tripping coil connected in series with the normally closed contact of the intermediate relay loses power, and the load electrically connected to the undervoltage tripping coil is unloaded; The generator load detection circuit is also electrically connected to an intermediate relay, and is electrically connected to a PLC input point through a normally closed contact of the intermediate relay, so that when the generator load detection circuit detects that the generator load reaches 90%, an alarm signal is issued through PLC control; The number of intermediate relays connected to each of the time relays is determined based on the type of load to be unloaded in the circuit where the time relay is located.

2. The load shedding control system for the generator distribution cabinet according to claim 1, characterized in that: If the load to be unloaded is a load controlled by a motor intelligent module or PLC electrically connected to the normally closed contact of the intermediate relay, then, After the intermediate relay is energized, the normally closed contact is disconnected, so that the motor intelligent module or PLC input point electrically connected to the normally closed contact is powered off, thereby unloading the load controlled by the motor intelligent module or the PLC.

3. The load shedding control system for the generator distribution cabinet according to claim 1, characterized in that: If the load to be unloaded is a load powered by a distribution panel or a power supply control cabinet for other systems, and the distribution panel or the power supply control cabinet for other systems is electrically connected to the intermediate relay through the load circuit shunt tripping coil, then, The normally open contact of the intermediate relay is connected in series with the load circuit shunt trip coil. After the intermediate relay is energized, the normally open contact of the intermediate relay closes, so that the load circuit shunt trip coil connected in series with the normally open contact of the intermediate relay is energized, thereby cutting off power to the distribution board or the control cabinet that supplies power to other systems.

4. The load shedding control system for the generator distribution cabinet according to claim 3, characterized in that: When the distribution board or the control cabinet for powering other systems is electrically connected to the intermediate relay through the load circuit shunt trip coil, a protection diode is arranged in parallel at both ends of the load circuit shunt trip coil, and the protection diode is specifically a reverse diode.

5. The load shedding control system for the generator distribution cabinet according to claim 1, characterized in that: If the load to be unloaded is a load powered by a distribution panel or a power supply control cabinet for other systems, and the distribution panel or the power supply control cabinet for other systems is electrically connected to the intermediate relay through an undervoltage trip coil, then, The normally closed contact of the intermediate relay is connected in series with the undervoltage tripping coil. After the intermediate relay is energized, the normally closed contact of the intermediate relay is disconnected, causing the undervoltage tripping coil connected in series with the normally closed contact of the intermediate relay to lose power, thereby cutting off power to the distribution board or the control cabinet that supplies power to other systems.

6. A ship, characterized in that: The ship adopts the generator distribution cabinet load cut-off control system as described in any one of 1-5 above to control the power generation system where the emergency generator is located.

Images