CN116085294A - Control device and power supply system - Google Patents
Control device and power supply system Download PDFInfo
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- CN116085294A CN116085294A CN202310371288.2A CN202310371288A CN116085294A CN 116085294 A CN116085294 A CN 116085294A CN 202310371288 A CN202310371288 A CN 202310371288A CN 116085294 A CN116085294 A CN 116085294A
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- 230000002159 abnormal effect Effects 0.000 claims description 5
- 230000001934 delay Effects 0.000 claims description 2
- 230000017525 heat dissipation Effects 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 6
- 230000005856 abnormality Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Keying Circuit Devices (AREA)
Abstract
The invention provides a control device and a power supply system, which are provided with a delay control unit, wherein after a main control loop controls dummy load to be unloaded, a fan control switch can be controlled to be turned off in a delay mode according to the state of the main control loop. The control device and the power line system can maintain heat dissipation of the dummy load after the dummy load is unloaded, and after the temperature of the dummy load is reduced to a certain safety range after the preset delay time, the fan stops working, so that the fan can be prevented from working inefficiently for a long time after the dummy load is unloaded under the condition that the effective heat dissipation of the fan to the dummy load is ensured, the service life of the fan is effectively prolonged while the safety is ensured, and the maintenance cost of the system is reduced.
Description
Technical Field
The present invention relates to the field of power technologies, and in particular, to a control device and a power system.
Background
The power supply unit of the power station uses the diesel generator set under the condition of low load for a long time, so that carbon deposition and the aggravation of component abrasion are easily caused, and the service life of the machine is influenced. Therefore, in recent years, more and more power stations are provided with dummy loads, the dummy loads are operated under the condition of low load end loads, and the work load of the power stations is increased, so that the power stations are prevented from operating under low load for a long time, the possibility of damage to units is reduced, and the maintenance cost of the power stations is reduced.
Referring to fig. 1, a schematic diagram of a part of a power supply system in the prior art is shown, in the power supply system in the prior art, a circuit breaker QF01 and a first contactor switch KM01 are sequentially arranged on a dummy load working loop between a unit power supply 01 and a dummy load 02, each loop of a control device is connected to a live wire of the unit power supply 01 through a fuse FU00, a protection circuit 03, a loading button switch, an unloading button switch and contactor coils KM01-C are sequentially arranged between a live wire end and a zero wire end of a main control loop of the control device, a fan M is directly connected between the fuse FU00 and a zero wire end N, and a second contactor switch KM01-1O and an indicator lamp HL01 are sequentially arranged between the live wire end and the zero wire end of an indicator lamp loop.
When the power supply system normally outputs, the breaker QF01 is closed, the fan M directly works, the wind pressure of the fan and the temperature of the system are normal, the wind pressure protection switch SP and the temperature protection switch ST of the protection circuit 03 are closed, the loading button switch SB01 is opened, the unloading button switch SB02 is closed, the contactor coils KM01-C are not connected with a unit power supply, the first contactor switch KM01 and the second contactor switch KM01-1O are opened, and the dummy load 02 and the indicator lamp HL01 do not work.
When the true load is reduced, a button of the loading button switch SB01 is pressed, the main control loop is conducted, the contactor coil KM01-C acts, the first contactor switch KM01 and the second contactor switch KM01-1O are driven to be closed, the dummy load working loop and the indicator lamp loop are connected with the unit power supply 01, the dummy load 02 works and the indicator lamp HL01 is lighted to indicate that the dummy load 02 is in operation.
When the real load is lifted to a certain level, a button of the unloading button switch SB02 is pressed, the main control circuit is disconnected, the contacts of the contactor coils KM01-C are restored, the first contactor switch KM01 and the second contactor switch KM01-1O are controlled to be restored to the disconnected state, the dummy load 02 stops working, and the indicator lamp HL01 is extinguished.
As described above, in the prior art, when the unit power supply normally outputs, no matter whether the dummy load works or not, the fan is in a continuous working state, the service life of the fan is greatly influenced, the system maintenance cost of the system can be increased, and the fan cannot be easily turned off in order to prevent the dummy load from working to overheat.
Disclosure of Invention
Based on the above, the invention aims to provide a control device and a power supply system, so that the self-adaptive closing of the fan after a certain time after the dummy load stops working is realized, the fan is prevented from working for a long time without working, the service life of the fan is further prolonged, and the maintenance cost of the system is reduced.
According to an aspect of the present invention, there is provided a control device for controlling a dummy load operation circuit between a unit power supply and a dummy load and a fan operation circuit between the unit power supply and a fan, the control device comprising:
the main control circuit is sequentially connected in series with a loading switch, an unloading switch and a controller between a live wire end and a zero wire end of the main control circuit, the controller controls the dummy load working circuit to be conducted under the condition that the main control circuit is conducted, and the controller controls the dummy load working circuit to be disconnected under the condition that the main control circuit is disconnected;
the control end of the delay control unit is connected to the intermediate node of the unloading switch and the controller;
the delay control unit controls the working loop of the fan to be conducted under the condition that the unloading switch and the middle node of the controller are connected with the power supply of the unit;
and under the condition that the connection state between the unloading switch and the intermediate node of the controller and the unit power supply is converted into the disconnection state, the delay control unit delays according to the preset delay time and then controls the working loop of the fan to be disconnected.
Optionally, the method further comprises:
the loading relay is used for controlling the closing of the loading switch according to a loading control signal;
and the unloading relay is used for controlling the disconnection of the unloading switch according to an unloading control signal.
Optionally, the load control signal input path of the load relay includes at least one of a remote input path, a local input path;
the load control signal input path of the load relay includes at least one of a remote input path and a local input path.
Optionally, the local input paths of the loading relay and the unloading relay are respectively provided with a loading button switch and an unloading button switch, and under the condition that the local input paths of the loading relay and the unloading relay are respectively conducted through the loading button switch and the unloading button switch, the loading relay and the unloading relay are respectively driven to enable the loading switch to be closed and the unloading switch to be opened.
Optionally, the controller is a contactor, and includes a contactor coil, a first contactor switch and a third contactor switch, the first contactor switch is disposed in the dummy load working loop, the third contactor switch is connected in parallel with the loading switch, and the contactor coil is disposed in the main control loop, so as to control the first contactor switch and the third contactor switch to be synchronously turned on and off according to the conduction state of the main control loop.
Optionally, the contactor further comprises a second contactor switch, the second contactor switch is arranged on a live wire input path of an indicator lamp in the indicator lamp loop, the second contactor switch is synchronously turned on and off with the first contactor switch, and the indicator lamp loop is arranged between a live wire end and a zero line end of the unit power supply.
Optionally, the main control loop further comprises a protection switch, and the protection switch is arranged between the unloading switch and an intermediate node of the controller and the controller;
the control device further comprises a protection control unit, the protection control unit comprises a protection circuit and an intermediate relay which are sequentially connected in series between a live wire end and a zero wire end of the unit power supply, the protection circuit is used for switching the input of the intermediate relay off under the condition that any one of the output wind pressure of the fan and the temperature of the dummy load is abnormal, and the intermediate relay is used for controlling the protection switch to be switched from being closed to being opened under the condition that the input is opened.
Optionally, the delay control unit comprises a delay relay.
Optionally, the delay control unit comprises a third relay and a programmable logic controller, wherein,
the third relay switch of the third relay is connected in series in the working loop of the fan;
the fan working signal output end of the programmable logic controller is connected with the relay coil of the third relay;
the programmable logic controller also comprises a loading control signal output end and an unloading control signal output end which are respectively used for providing the loading control signal and the unloading control signal;
and when the unloading control signal output end is set and the preset delay time is passed, the fan working signal output end is reset, and the third relay switch is disconnected.
The control device provided by the invention can delay the downtime of the fan according to the preset delay time after the dummy load is unloaded, so that the heat dissipation of the dummy load can be maintained after the dummy load is unloaded, the fan stops working after the temperature of the dummy load is reduced to a certain safety range after the preset delay time, the fan can be prevented from effectively dissipating the heat of the fan to the dummy load under the condition of avoiding the long-time working of the fan, the service life of the fan is effectively prolonged while the safety is ensured, and the maintenance cost of a system is reduced.
According to another aspect of the present invention, there is provided a power supply system including:
the device comprises a unit power supply, a dummy load, a fan, a dummy load working loop between the unit power supply and the dummy load, a fan working loop between the unit power supply and the fan and a control device provided by the invention.
The power supply system provided by the invention comprises the control device provided by the invention, so that the service life of the fan can be prolonged and the maintenance cost of the system can be reduced under the condition of guaranteeing the heat dissipation requirement of the dummy load.
Drawings
FIG. 1 is a schematic diagram of a portion of a prior art power supply system;
FIG. 2 is a schematic diagram of a portion of a power line system according to an embodiment of the invention;
fig. 3 is a schematic diagram of a part of a power supply system according to a third embodiment of the present invention.
Description of main reference numerals:
wherein, the last positions of the reference numerals KM01-1O, KM01-2O, KR-1O, KB01-1O, KT-1O and KB03-1O are the letter O.
The invention will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Several embodiments of the invention are presented in the figures. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Example 1
In the first embodiment of the present application, the first contactor switch KM01, the second contactor switch KM01-1O, the third contactor switch KM01-2O, the protection switch KR-1O, the loading switch KB01-1O, and the fan control switch KT-1O are normally open contacts, when the corresponding contactor coil is energized and operated, the contacts are closed to conduct the corresponding electric loop, when the corresponding contactor coil is not energized and not operated, the contacts are in an open state, the contacts are opened to disconnect the corresponding electric loop, and when the corresponding contactor coil is de-energized, the contact state is restored from closed to open; the unloading switch KB02-1C is a normally closed contact, when the corresponding contactor coil is electrified and acts, the contact is opened to disconnect the corresponding electric loop, when the corresponding contactor coil is not electrified and acts, the unloading switch KB02-1C is in a closed state, when the corresponding contactor coil is not electrified and acts, the contact is closed to conduct the corresponding electric loop, and when the corresponding contactor coil is in a power-off state, the contact state is restored from the open state to the closed state.
Referring to fig. 2, a schematic diagram of a portion of a power supply system according to an embodiment of the invention is shown.
In the power supply system of the embodiment of the present invention, a circuit breaker QF01 (which is a miniature circuit breaker or other size circuit breaker, and may be selected according to requirements such as an actual configurable space, etc.) and a first contactor switch KM01 are sequentially disposed on a dummy load working circuit between a unit power supply 01 and a dummy load 02, and the control device of the present embodiment mainly controls the working of the dummy load by controlling the first contactor switch KM01, where the circuit breaker QF01 is in a normally closed state when the system is in normal operation, and a real load may be connected to the rear end of the circuit breaker QF01, which does not relate to the main focus of the present application, and the present application will not be described in detail herein.
The circuits of the control device of the present embodiment are connected to the live wire end of the unit power supply through the fuse FU00 for overcurrent protection of the system, and in an alternative embodiment, the fuse FU00 may be replaced by another overcurrent protection device such as an air self-breaking switch, which is not particularly limited in this application.
In the present application, without any particular explanation, the connection of the unit power supply 01 to the control device is via the circuit breaker QF01 and the fuse FU00, so that the circuit breaker QF01 and the fuse FU00 can be used for the total short-circuit control and the total overcurrent protection of the system.
In the embodiment, a loading switch KB01-1O, an unloading switch KB02-1C, a protection switch KR-1O, a contactor coil KM01-C and a third contactor switch KM01-2O which is connected in parallel with the loading switch KB01-1O are sequentially connected in series between a live wire end and a zero wire end of the main control loop.
In the initial state, the loading switch KB01-1O is in an open state, the unloading switch KB02-1C is in a closed state, the protection switch KR-1O is in an open state, the contactor coil KM01-C is in a non-action state, and the first contactor switch KM01 and the third contactor switch KM01-2O are in an open state.
The delay relay KT is connected with the unit power supply 01 in series, the control end U23 of the delay relay is connected to the intermediate node of the unloading switch KB02-1C and the protection switch KR-1O, the fan control switch KT-1O is driven to be closed under the condition that the control end U23 of the delay relay is connected with the unit power supply 01, the fan M starts to work, and the fan control switch KT-1O is driven to be opened according to the preset delay time after the control end U23 of the delay relay is disconnected under the condition that the control end U23 of the delay relay is disconnected with the unit power supply 01, and the fan M is closed, so that control of a fan working loop is realized.
The load relay KB01 and the unload relay KB02 control the on and off of the load switch KB01-1O and the unload switch KB02-1C, respectively.
In this embodiment, the load control signal input path of the load relay KB01 includes a first remote input path 102 and a local input path, and when the first remote input path 102 provides an active level output according to the remote control signal, the load relay KB01 controls the load switch KB01-1O to be closed; when a button of the loading button switch SB01 on the local input path is pressed to be closed, the loading control signal input path of the loading relay KB01 is connected with the local power supply 101, and the loading relay KB01 controls the loading switch KB01-1O to be in a closed state; when the first remote input path 102 has no active level output and the load button switch SB01 is turned off, the load relay KB01 controls the load switch KB01-1O to be in an off state.
The unloading control signal input path of the unloading relay KB02 comprises a second remote input path 103 and a local input path, and when the second remote input path 103 provides an effective level output according to a remote control signal, the unloading relay KB02 controls the unloading switch KB02-1C to be opened; when the button of the unload button switch SB02 on the local input path is pressed to be closed, the unload control signal input path of the unload relay KB02 turns on the local power supply 101, and the unload relay KB02 controls the unload switch KB02-1C to be in an off state; when the second remote input path 103 has no active level output and the unload button switch SB02 is open, the unload relay KB02 controls the unload switch KB02-1C to be in a closed state.
The button operations of the loading button switch SB01 and the unloading button switch SB02 may be adaptively selected according to actual needs, for example, a knob or a toggle switch is used for operation, which is not particularly limited in the present application.
A second contactor switch KM01-1O and an indicator lamp HL01 are sequentially connected in series between the live wire end and the zero wire end of the indicator lamp loop.
In this embodiment, the controllers in the main control loop are contactors corresponding to the contactor coil KM01-C, the first contactor switch KM01, the second contactor switch KM01-1O and the third contactor switch KM01-2O.
The protection control unit comprises a protection circuit 03 and an intermediate relay KR which are sequentially connected in series between a live wire end and a zero line end of a unit power supply 01, the intermediate relay KR controls the state switching of a protection switch KR-1O, under the condition that the output wind pressure of a fan M and the temperature of a dummy load 02 are normal (the abnormality of the wind pressure comprises the too small wind pressure, the too large wind pressure and the SP fault of the wind pressure protection switch, the abnormality of the temperature comprises the too high temperature of the dummy load 02 or the ST fault of the temperature protection switch), the SP and the ST of the temperature protection switch of the protection circuit 03 are both closed, and the KR can be connected with the unit power supply through the protection circuit 03 to control the KR-1O to be in a closed state. Under the condition that any one of the output wind pressure of the fan M and the temperature of the dummy load 02 is abnormal (the abnormality of the wind pressure comprises too small wind pressure and too large wind pressure), the protection switch KR-1O is in an off state, the dummy load 02 cannot work, the dummy load can be prevented from being loaded under the condition that protection measures are not in place, and potential safety hazards are reduced.
When the unit power supply 01 works, the breaker QF01 is closed.
When the unit power supply 01 works and the dummy load 02 is required to work, a button of the loading button switch SB01 is pressed, the loading button switch SB01 is closed, a loading control signal input path of the loading relay KB01 is connected with the local power supply 101, the loading relay KB01 drives the loading switch KB01-1O to be closed, a control end U23 of the delay relay KT is connected with the unit power supply 01, the fan control switch KT-1O is controlled to be closed, the fan M starts to work, at the moment, the output wind pressure of the fan M and the temperature of the dummy load 02 are normal, the wind pressure protection switch SP and the temperature protection switch ST of the protection circuit 03 are closed, the intermediate relay KR controls the protection switch KR-1O to be in a closed state, the contactor coils KM01-C are connected with the unit power supply 01, the first contactor switch KM01, the second contactor switch KM01-1O and the third contactor switch KM01-2O are all closed, the dummy load 02 is connected with the unit power supply 01 to work, and the indication lamp HL01 is lighted.
After the third contactor switch KM01-2O is closed, no matter what input the loading relay KB01 is, the main control loop can be kept on through the third contactor switch KM01-2O, so that abnormal unloading of the dummy load 02 caused by abnormal input of the loading relay KB01 can be avoided, loading stability of the dummy load 02 is improved, and system reliability is improved.
When the unit power supply 01 works and the dummy load 02 is required to be unloaded, a button of the unloading button switch SB02 is pressed, an unloading control signal input path of the unloading relay KB02 is connected with the local power supply 101 to control the unloading switch KB02-1C to be disconnected, the contactor coils KM01-C are disconnected and connected with the unit power supply 01, the first contactor switch KM01, the second contactor switch KM01-1O and the third contactor switch KM01-2O are switched to be in a disconnected state, a dummy load working loop is disconnected, the dummy load 02 stops working, the indicator lamp HL01 is turned off, a control end U23 of the delay relay KT is disconnected and connected with the unit power supply 01, after a preset delay time, the fan control switch KT-1O is controlled to be switched to be in a disconnected state to close the fan M, the fan M is enabled to continue to work for a preset delay time after the fan M stops working, the temperature of the dummy load 02 is reduced to a certain value, potential safety hazards caused by overheating of the dummy load 02 are reduced, and meanwhile the service life of the fan M is prevented from being prolonged after the fan M stops working for a long time after the dummy load 02 stops working.
The control device and the power supply system can effectively realize that the fan still continuously works for a period of time after the dummy load is unloaded, so that the heat of the dummy load is continuously dissipated after the dummy load is unloaded, and the fan is stopped after the dummy load is reduced to a safe temperature, thereby not only ensuring the sufficient heat dissipation of the dummy load 02, but also avoiding the long-time invalid work of the fan after the dummy load is unloaded.
Example two
The main structure of the second embodiment is the same as that of the first embodiment, and the same parts are not described in detail herein, and the main difference is that in the second embodiment, the controller of the main control loop is a molded case circuit breaker, the corresponding contactor coil KM01-C, the first contactor switch KM01, the second contactor switch KM01-1O, and the third contactor switch KM01-2O are replaced by corresponding components of the molded case circuit breaker, the circuit breaker QF01 can be increased, each switch is in an open state when no current is input to the molded case circuit breaker, and each switch is switched to a closed state when a large current is input to the molded case circuit breaker.
Example III
Fig. 3 shows a schematic diagram of a part of the power supply system in the third embodiment of the present invention, further referring to fig. 3, the main structure of the third embodiment is the same as that of the first embodiment, and the same parts are not repeated herein, and the main difference is that the delay control units are different, in the third embodiment, the delay control units correspond to the programmable logic controller 04 and the third relay KB03, the contact switch of the third relay KB03 corresponds to the third relay KB03-1O, and the third relay KB03-1O is connected in series on the working circuit of the fan M, wherein the programmable logic controller 04 includes a loading control signal output terminal Q0.0, an unloading control signal output terminal Q0.1, and a fan working signal output terminal Q0.2, which are respectively connected to the loading relay KB01, the unloading relay KB02, and the third relay KB03, and the loading relay KB02 are controlled by the loading control signal and the unloading control signal provided by the programmable logic controller 04, the third relay KB03-1O is a normally open switch, and the third relay 03-1O is in a state and a non-state when the third relay KB03 is in a state and a non-state and the third relay 03 is in a state and a state is opened.
When the dummy load 02 is required to work, a loading control signal output end Q0.0 of the programmable logic controller 04 is set, and the system state is the same as that when the loading button switch SB01 is pressed to be conducted, and the details are not repeated here; when the dummy load 02 is required to stop working, the unloading control signal output end Q0.1 of the programmable logic controller 04 is set, and the system state is the same as that when the unloading button switch SB02 is pressed to be turned on, and details are not repeated here.
When the loading control signal output end Q0.0 of the programmable logic controller 04 is set, the fan working signal output end Q0.2 of the programmable logic controller 04 is set, the third relay KB03 acts, the third relay switch KB03-1O is closed, and the fan M works; when the unloading control signal output end Q0.1 of the programmable logic controller 04 is set and a preset delay time is elapsed, the third relay KB03 is in a non-action state, the third relay switch KB03-1O is disconnected, and the fan M stops working. The delay of the fan M is controlled to stop according to the programmable logic controller 04, the delay time is flexible and controllable, the adjustable convenience of the delay time is realized, and different fan delay closing times are conveniently set according to different heat dissipation time requirements.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A control device for control of a dummy load operating circuit between a unit power supply and a dummy load and a fan operating circuit between the unit power supply and a fan, the control device comprising:
the main control circuit is sequentially connected in series with a loading switch, an unloading switch and a controller between a live wire end and a zero wire end of the main control circuit, the controller controls the dummy load working circuit to be conducted under the condition that the main control circuit is conducted, and the controller controls the dummy load working circuit to be disconnected under the condition that the main control circuit is disconnected;
the control end of the delay control unit is connected to the intermediate node of the unloading switch and the controller;
the delay control unit controls the working loop of the fan to be conducted under the condition that the unloading switch and the middle node of the controller are connected with the power supply of the unit;
and under the condition that the connection state between the unloading switch and the intermediate node of the controller and the unit power supply is converted into the disconnection state, the delay control unit delays according to the preset delay time and then controls the working loop of the fan to be disconnected.
2. The control device according to claim 1, characterized by further comprising:
the loading relay is used for controlling the closing of the loading switch according to a loading control signal;
and the unloading relay is used for controlling the disconnection of the unloading switch according to an unloading control signal.
3. The control device according to claim 2, wherein,
the loading control signal input path of the loading relay comprises at least one of a remote input path and a local input path;
the load control signal input path of the load relay includes at least one of a remote input path and a local input path.
4. A control device according to claim 3, wherein,
the load relay and the unload relay are respectively provided with a load button switch and an unload button switch on local input paths, and under the condition that the load relay and the local input paths of the unload relay are respectively conducted through the load button switch and the unload button switch, the load relay and the unload relay are respectively driven to enable the load switch to be closed and the unload switch to be opened.
5. The control device according to claim 1, wherein,
the controller is a contactor and comprises a contactor coil, a first contactor switch and a third contactor switch, wherein the first contactor switch is arranged in the dummy load working loop, the third contactor switch is connected with the loading switch in parallel, and the contactor coil is arranged in the main control loop so as to control the first contactor switch and the third contactor switch to be synchronously turned on and off according to the conduction state of the main control loop.
6. The control device according to claim 5, wherein,
the contactor further comprises a second contactor switch, the second contactor switch is arranged on a live wire input path of an indicator lamp in the indicator lamp loop, the second contactor switch is synchronously switched on and off with the first contactor switch, and the indicator lamp loop is arranged between a live wire end and a zero line end of the unit power supply.
7. The control device according to claim 1, wherein,
the main control loop further comprises a protection switch, wherein the protection switch is arranged between the unloading switch and an intermediate node of the controller and the controller;
the control device further comprises a protection control unit, the protection control unit comprises a protection circuit and an intermediate relay which are sequentially connected in series between a live wire end and a zero wire end of the unit power supply, the protection circuit is used for switching the input of the intermediate relay off under the condition that any one of the output wind pressure of the fan and the temperature of the dummy load is abnormal, and the intermediate relay is used for controlling the protection switch to be switched from being closed to being opened under the condition that the input is opened.
8. The control device according to claim 1, wherein,
the delay control unit comprises a delay relay.
9. The control device of claim 2, wherein the delay control unit comprises a third relay and a programmable logic controller, wherein,
the third relay switch of the third relay is connected in series in the working loop of the fan;
the fan working signal output end of the programmable logic controller is connected with the relay coil of the third relay;
the programmable logic controller also comprises a loading control signal output end and an unloading control signal output end which are respectively used for providing the loading control signal and the unloading control signal;
and when the unloading control signal output end is set and the preset delay time is passed, the fan working signal output end is reset, and the third relay switch is disconnected.
10. A power supply system, comprising:
-a unit power supply, -a dummy load, -a fan, -a dummy load operating circuit between the unit power supply and the dummy load, -a fan operating circuit between the unit power supply and the fan, and-a control device according to any of claims 1 to 9.
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