CN212012252U - Commercial power generation power supply switching circuit and power distribution system - Google Patents
Commercial power generation power supply switching circuit and power distribution system Download PDFInfo
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- CN212012252U CN212012252U CN202020563343.XU CN202020563343U CN212012252U CN 212012252 U CN212012252 U CN 212012252U CN 202020563343 U CN202020563343 U CN 202020563343U CN 212012252 U CN212012252 U CN 212012252U
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Abstract
The application belongs to the technical field of power supply systems, and particularly relates to a commercial power generation power supply switching circuit and a power distribution system, wherein the connection state between a commercial power supply and a load is controlled through a first circuit breaker; the detection relay detects the mains supply voltage output by the mains supply and generates a mains supply detection signal; the second circuit breaker controls the connection state between the power generation power supply and the load according to the commercial power detection signal; wherein, the load is connected with at most one power supply of a commercial power supply and a power generation power supply; the utility model has the advantages of realize automatic, quick effectual switching commercial power supply and the power supply of supplementary power generation source, commercial power supply and power generation source switching time are short, efficient, have reduced the economic loss that the power supply switching time overlength leads to, have practiced thrift the cost, have improved commercial power generation source switching circuit's practicality.
Description
Technical Field
The application belongs to the technical field of power supply systems, and particularly relates to a commercial power generation power supply switching circuit and a power distribution system.
Background
At present, in general factory and resident commercial power supply and distribution systems, in order to ensure that important loads do not stop power supply (such as loads of fire elevators, fire pumps, emergency lighting and the like), a mains supply and power generation dual-power supply mode is often adopted; the commercial power is supplied by a transformer, and the power generation is supplied by a diesel generator; the utility power and the power generation supply power to the load on the same section of bus, under normal conditions, the utility power supplies power, and when the utility power fails and has power failure, the power generation equipment needs to be switched to, and the power generation equipment generates power and supplies power, so that the influence of power failure is reduced; when the mains supply is restored again, the mains supply needs to be switched back. Traditional commercial power and electricity generation switch and adopt manual switching, join in marriage the electrical room and need set up special person on duty, can produce the cost of labor, and manual switching can cause the power failure gap time overlength to lead to certain economic loss.
Therefore, the problems of long power failure interval time, low power supply switching efficiency and high cost caused by long switching time of manually switching commercial power and a power generation power supply exist in the traditional technical scheme.
SUMMERY OF THE UTILITY MODEL
An object of this application is to provide a commercial power generation power supply switching circuit and distribution system, aims at solving traditional switching time at manual switching power and leads to the power failure gap time long, and the power switches inefficiency, problem with high costs.
A first aspect of the embodiments of the present application provides a commercial power generation power supply switching circuit, is connected with commercial power supply, power generation power supply and load respectively, commercial power generation power supply switching circuit includes:
a first circuit breaker connected to the commercial power source and the load, respectively, and configured to control a connection state between the commercial power source and the load;
the coil of the detection relay is connected with the mains supply and is configured to detect the mains supply voltage output by the mains supply and generate a mains supply detection signal;
the second circuit breaker is respectively connected with the first circuit breaker, the power generation source, the load and the detection relay and is configured to control the connection state between the power generation source and the load according to the commercial power detection signal; wherein the load is connected to at most one of the mains power supply and the power generation power supply.
In one embodiment, the commercial power generation power supply switching circuit further includes:
the first time relay is respectively connected with the mains supply, the normally closed auxiliary contacts of the first circuit breaker and the second circuit breaker and is configured to be communicated with the closing coil of the first circuit breaker in a time-delay mode according to the mains supply voltage;
and the second time relay is respectively connected with the power generation power supply, the second circuit breaker, the normally closed auxiliary contact of the first circuit breaker and the normally closed contact of the detection relay and is configured to be communicated with the closing coil of the second circuit breaker in a time-delay manner according to the power generation voltage.
In one embodiment, the commercial power generation power supply switching circuit further includes:
the mode conversion switch is respectively connected with the mains supply, the power generation supply, the first time relay and the second time relay and is configured to switch a power distribution mode according to a first input signal;
and the gate control assembly is connected with the mode change-over switch, the normally closed auxiliary contact of the second circuit breaker, the first circuit breaker, the normally closed auxiliary contact of the first circuit breaker and the second circuit breaker respectively, and is configured to be communicated with the mains supply or the power generation power supply according to a second input signal in a manual mode.
In one embodiment, the commercial power generation power supply switching circuit further includes:
and the first indicating circuit is respectively connected with the mains supply and the first circuit breaker and is configured to indicate the state of the first circuit breaker according to the mains voltage.
In one embodiment, the commercial power generation power supply switching circuit further includes:
and the second indicating circuit is respectively connected with the power generation power supply and the second circuit breaker and is configured to indicate the state of the second circuit breaker according to the power generation voltage.
In one embodiment, the commercial power generation power supply switching circuit further includes:
the first protection circuit is respectively connected with the mains supply, the detection relay and the first circuit breaker and is configured to perform overcurrent protection on the mains supply voltage;
and the second protection circuit is respectively connected with the power generation power supply and the second circuit breaker and is configured to perform overcurrent protection on the generated voltage.
In one embodiment, the detection relay includes: a first intermediate relay and a second intermediate relay; wherein the content of the first and second substances,
the coil of first auxiliary relay with the coil of second auxiliary relay with mains power supply connects, the normally closed contact of first auxiliary relay with the normally closed contact of second auxiliary relay is connected, the normally closed contact of first auxiliary relay still with power generation source connects, the normally closed contact of second auxiliary relay still with the second circuit breaker is connected.
In one embodiment, a mechanical interlock and an electrical interlock are further provided between the first circuit breaker and the second circuit breaker.
A first aspect of an embodiment of the present application provides a power distribution system, including: the power supply comprises a mains supply, a power generation supply, a load and a mains power generation supply switching circuit as described in any one of the above.
The utility model provides a commercial power generation power supply switching circuit controls the connection state between commercial power supply and load through the first circuit breaker; the detection relay detects the mains supply voltage output by the mains supply and generates a mains supply detection signal; the second circuit breaker controls the connection state between the power generation power supply and the load according to the commercial power detection signal; wherein the load is connected with at most one of a commercial power supply and a power generation power supply; the utility model has the advantages of realize automatic, quick effectual switching commercial power supply and power generation power supply in order to supply power to the load, power switching time is short, efficient, has reduced the economic loss that the power switching time overlength leads to, has practiced thrift the cost, has improved commercial power generation power supply switching circuit's practicality.
Drawings
Fig. 1 is a schematic circuit diagram of an example of a commercial power switching circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a mechanical interlock and an electrical interlock between a first circuit breaker and a second circuit breaker in a commercial power switching circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic circuit diagram of another example of a commercial power switching circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic circuit diagram of another example of a commercial power switching circuit according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Fig. 1 shows a structural schematic view … … provided in the preferred embodiment of the present application (fig. 1 shows a first embodiment of the present application), and for convenience of illustration, only the parts related to the present embodiment are shown, which are detailed as follows:
a first aspect of the embodiments of the present application provides a commercial power generation power supply switching circuit, is connected with commercial power supply, power generation power supply and load respectively, and commercial power generation power supply switching circuit includes: the device comprises a first breaker S-QF, a second breaker F-QF and a detection relay KA.
The first breaker S-QF is respectively connected with the commercial power supply and the load and is configured to control the connection state between the commercial power supply and the load; the detection relay KA is connected with the mains supply through a coil and is configured to detect mains supply voltage output by the mains supply and generate a mains supply detection signal; the second circuit breaker F-QF is respectively connected with the first circuit breaker S-QF, the power generation source, the load and the detection relay KA and is configured to control the connection state between the power generation source and the load according to the commercial power detection signal; wherein the load is connected to at most one of the mains supply and the power generation supply.
In specific implementation, the commercial power generation power supply switching circuit is arranged in the low-voltage power distribution cabinet. Optionally, the mains supply provides a mains voltage; the power generation power supply is a diesel generator power supply and provides power generation voltage. The transformer converts the voltage of commercial power output by the commercial power supply and outputs the commercial power voltage at the low-voltage side of the transformer, and the incoming line end of the first breaker S-QF is connected with the commercial power voltage. And the inlet wire end of the second breaker F-QF is connected with the generated voltage output by the power generation power supply. And the outlet end of the first breaker S-QF and the outlet end of the second breaker F-QF are connected with a load to supply power to the load.
Further, referring to fig. 2, a mechanical interlock and an electrical interlock are arranged between the first breaker S-QF and the second breaker F-QF, so that only one of the two breakers is connected, and the parallel operation of the commercial power and the power generation of the generator is prevented. And the 1 TAa-c and the 2 TAa-c are current transformers which are used for detecting corresponding currents of a mains supply and a power generation supply and feeding the currents back to the upper terminal equipment.
When the mains supply supplies power, a coil of the detection relay KA is electrified, so that a normally closed contact of the detection relay KA is disconnected, a closing coil X of a first breaker S-QF is connected, the first breaker S-QF is closed, a normally closed auxiliary contact of the first breaker S-QF is disconnected, the connection between a power generation power supply and a second breaker F-QF is cut off by disconnecting the normally closed contact of the detection relay KA and disconnecting the normally closed auxiliary contact of the first breaker S-QF, and therefore an automatic closing control loop of the second breaker F-QF is cut off, at the moment, the mains supply supplies power to a load, and the power generation power supply does not provide power generation voltage; when the mains supply fails, the undervoltage tripper of the first circuit breaker S-QF acts to enable the first circuit breaker S-QF to be switched off, the normally closed auxiliary contact of the first circuit breaker S-QF is reset and closed, so that the diesel generator is started to generate power to provide power generation voltage, meanwhile, the coil of the relay KA is detected to lose power, the normally closed contact of the relay KA is detected to be reset and closed, the closing coil X of the second circuit breaker F-QF is switched on, and at the moment, the diesel power generation supplies power to the load; when the mains supply is recovered, the coil of the detection relay KA is electrified again, the normally closed contact of the detection relay KA is disconnected, the under-voltage release of the second breaker F-QF acts to enable the second breaker F-QF to be switched off, the normally closed auxiliary contact of the second breaker F-QF is reset and closed, the switching-on coil X of the first breaker S-QF is switched on, and the first breaker S-QF is switched on to recover the mains supply to supply power to the load. Optionally, the normally closed auxiliary contact of the first breaker S-QF is disconnected, the diesel generator is controlled to stop through feedback, and the generation is stopped and the generated voltage is output.
The utility model provides a can be automatic, quick effectual switching commercial power supply and the supplementary diesel generator power supply, power switching time is short, efficient, has reduced the economic loss that the power switching time overlength leads to, utilizes the relay rather than expensive controller to carry out power supply's switching control, and the cost is reduced has improved commercial power generation power supply switching circuit's practicality.
Referring to fig. 3, in one embodiment, the commercial power switching circuit further includes: a first time relay 1KT and a second time relay 2 KT.
The first time relay 1KT is respectively connected with a mains supply, a normally closed auxiliary contact of a first breaker S-QF and a normally closed auxiliary contact of a second breaker F-QF and is configured to be communicated with a switching-on coil of the first breaker S-QF in a time-delay mode according to mains supply voltage; and the second time relay 2KT is respectively connected with the power generation power supply, the second breaker F-QF, the normally closed auxiliary contact of the first breaker S-QF and the normally closed contact of the detection relay KA, and is configured to be communicated with the closing coil of the second breaker F-QF in a time-delay manner according to the power generation voltage.
When the mains supply is powered, the coil of the first time relay 1KT is electrified, the normally open contact of the first time relay 1KT is closed in a delayed manner, for example, the delay time is adjustable within 0-60 seconds, the closing coil X of the first circuit breaker S-QF is switched on in a delayed manner, the S-QF of the first circuit breaker S-QF is switched on, the normally closed auxiliary contact of the first circuit breaker S-QF is switched off, the mains supply voltage is switched on to a load in a delayed manner, meanwhile, the coil of the detection relay KA is electrified, the normally closed contact of the detection relay KA is switched off, the connection between the power generation power supply and the coil of the second time relay 2KT is disconnected, the normally open contact of the second time relay 2KT is kept disconnected due to the coil of the second time relay 2KT, the connection between the power generation power supply and the second circuit breaker F-QF is disconnected, and the, at the moment, the load is supplied with power by the commercial power, and the power generation power supply does not provide power generation voltage; when the mains supply fails, the undervoltage release of the first breaker S-QF acts to enable the first breaker S-QF to be opened, the normally closed auxiliary contact of the first breaker S-QF is reset and closed, so that the diesel generator is started to generate power to provide generating voltage, meanwhile, the coil of the relay KA is detected to lose power, the normally closed contact of the relay KA is detected to be reset and closed, the generating voltage is communicated to the second time relay 2KT, the coil of the second time relay 2KT is electrified, the normally open contact of the second time relay 2KT is closed in a delayed mode, for example, the delay time is adjustable within 0-60 seconds, the closing coil X of the second breaker F-QF is connected in a delayed mode, the second breaker F-QF is closed, the generating voltage is conducted to a load in a delayed mode, and at the moment, the diesel power generation; when the mains supply recovers the incoming call, the coil of the detection relay KA is electrified again, the normally closed contact of the detection relay KA is disconnected, the under-voltage release of the second breaker F-QF acts to enable the second breaker F-QF to be opened, the normally closed auxiliary contact of the second breaker F-QF is reset and closed, meanwhile, the coil of the first time relay 1KT is electrified, the normally open contact of the first time relay 1KT is closed in a delayed mode, the closing coil X of the first breaker S-QF is connected, and the first breaker S-QF is closed and recovers the mains supply to supply power to the load; the reliable and effective switching of the power supply is realized, and the safety and reliability of the commercial power generation power supply switching circuit are improved. Optionally, the normally closed auxiliary contact of the first breaker S-QF is opened, and the feedback control diesel generator stops to supply the generating voltage.
In one embodiment, the commercial power generation power supply switching circuit further includes: mode switch SA and gate control subassembly.
The mode conversion switch SA is respectively connected with a mains supply, a power generation supply, a first time relay 1KT and a second time relay 2KT and is configured to switch a power distribution mode according to a first input signal; and the gate control assembly is respectively connected with the mode transfer switch SA, the normally closed auxiliary contact of the second circuit breaker F-QF, the first circuit breaker S-QF, the normally closed auxiliary contact of the first circuit breaker S-QF and the second circuit breaker F-QF and is configured to be communicated with a mains supply or a power generation supply according to a second input signal.
In specific implementation, a user can input a first input signal by operating a switch, or operating a key switch or a touch screen for input, so as to switch the power distribution mode. Specifically, referring to fig. 3, a user operates the mode switch SA to generate a corresponding first input signal to switch the power supply and distribution system to a manual mode, an automatic mode, or a stop mode. The gate control assembly is arranged on the low-voltage cabinet door and comprises a closing button 1SBC of the first breaker S-QF, a separating button 1SBS of the first breaker S-QF, a closing button 2SBC of the second breaker F-QF and a separating button 2SBS of the second breaker F-QF. In the manual mode, a user generates a second input signal by operating the gate control assembly to control the connection of the mains supply or the power generation supply, for example, when the mode switch SA is shifted to the "manual" gear position, the user can control the first circuit breaker S-QF and the second circuit breaker F-QF to sequentially open and close through the opening and closing buttons respectively corresponding to the first circuit breaker S-QF and the second circuit breaker F-QF on the cabinet door, so as to switch the mains supply and the power generation and supply. When the mode conversion switch SA is dialed to an 'automatic' gear position, the detection of the mains supply is realized through the first circuit breaker S-QF, the second circuit breaker F-QF, the detection relay KA, the first time relay 1KT and the second time relay 2KT, and the power generation power supply is switched off according to the detection of the mains supply access, and the mains supply supplies power to the load; the power generation power supply is started according to the fact that the mains supply is not detected to be connected, the diesel generator generates power to supply power to the load, and the mains supply and the power generation are automatically switched to supply power to the load.
In one embodiment, the commercial power generation power supply switching circuit further includes: a first indicator circuit 11.
And the first indicating circuit 11 is connected with the mains supply and the first breaker and is configured to indicate the state of the first breaker S-QF according to the mains voltage.
In real time, referring to fig. 4, the first indicator circuit 11 includes an intermediate relay 1KA3, a first indicator lamp 1HG, and a second indicator lamp 1 HR; the first end of a coil of the intermediate relay 1KA3 is connected with mains voltage, the second end of the coil of the intermediate relay 1KA3 is connected with a first breaker S-QF, a normally closed contact of the intermediate relay 1KA3 is connected with the second end of the first indicator light 1HG and the first breaker S-QF, a normally open contact of the intermediate relay 1KA3 is connected with the second end of the second indicator light 1HR and the first breaker S-QF, and the first end of the first indicator light 1HG and the first end of the second indicator light 1HR are connected with mains voltage together. When the mains supply is connected, the coil of the intermediate relay 1KA3 is electrified, the normally closed contact of the intermediate relay 1KA3 is disconnected, the normally open contact of the intermediate relay 1KA3 is closed, the first indicator lamp 1HG is not lighted, the second indicator lamp 1HR is lighted, and the normal switching-on working state of the first circuit breaker S-QF is indicated; when the mains supply is not accessed or the mains supply fault or the first breaker S-QF fault cannot be connected with the mains supply, the coil of the intermediate relay 1KA3 is not electrified, the normally closed contact of the intermediate relay 1KA3 is kept closed, the normally open contact of the intermediate relay 1KA3 is kept open, the first indicator lamp 1HG is on, the second indicator lamp 1HR is not on, and the opening working state of the first breaker S-QF is indicated.
In one embodiment, the commercial power generation power supply switching circuit further includes: a second indicator circuit 15.
And a second indicating circuit 15 connected to the power generation source and the second breaker F-QF and configured to indicate a state of the second breaker F-QF according to the power generation voltage.
In real time, with reference to fig. 4, the second indicator circuit 15 comprises an intermediate relay 2KA1, a third indicator lamp 2HG and a fourth indicator lamp 2 HR; the first end of a coil of the intermediate relay 2KA1 is connected with a generating voltage, the second end of the coil of the intermediate relay 2KA1 is connected with a second circuit breaker F-QF, a normally closed contact of the intermediate relay 2KA1 is connected with the second end of the third indicator light 2HG and the second circuit breaker F-QF, a normally open contact of the intermediate relay 2KA1 is connected with the second end of the fourth indicator light 2HR and the second circuit breaker F-QF, and the first end of the third indicator light 2HG and the first end of the fourth indicator light 2HR are connected with the generating voltage together. When the power generation voltage is connected, the coil of the intermediate relay 2KA1 is electrified, the normally closed contact of the intermediate relay 2KA1 is disconnected, the normally open contact of the intermediate relay 2KA1 is closed, the third indicator lamp 2HG is not lighted, the fourth indicator lamp 2HR is lighted, and the normal switching-on working state of the second circuit breaker F-QF is indicated; when the power generation voltage is not accessed or the power supply fault of the power generation power supply or the F-QF fault of the second circuit breaker cannot be connected, the coil of the intermediate relay 2KA1 cannot be powered, the normally closed contact of the intermediate relay 2KA1 is kept closed, the normally open contact of the intermediate relay 2KA1 is kept open, the third indicator lamp 2HG is turned on, the fourth indicator lamp 2HR is not turned on, and the opening working state of the second circuit breaker F-QF is indicated.
In one embodiment, the commercial power generation power supply switching circuit further includes: a first protection circuit 16 and a second protection circuit 17.
The first protection circuit 16 is respectively connected with the mains supply, the detection relay KA and the first breaker S-QF and is configured to perform overcurrent protection on mains supply voltage; and the second protection circuit 17 is respectively connected with the power generation power supply and the second breaker F-QF and is configured to perform overcurrent protection on the power generation voltage.
In specific implementation, the first protection circuit 16 and the second protection circuit 17 both include fuses, for example, as shown in fig. 4, the first protection circuit 16 employs a fuse 1FU1, and the second protection circuit 17 employs a second fuse 1FU1, so that it is possible to prevent the electric current corresponding to the mains voltage and the generated voltage from being too large or the temperatures of the mains power supply and the generated power supply from being too high to damage the mains power supply and the generated power supply and electronic components in the rear-end circuit, and improve the safety and reliability of the switching circuit of the mains power generation power supply.
In one embodiment, the detection relay KA includes at least two intermediate relays. Only one of a multi-guarantee mains supply and a power generation power supply is communicated to a load to supply power to the load.
In one embodiment, referring to fig. 4, the detection relay KA includes: a first intermediate relay 1KA1 and a second intermediate relay 1KA 2; the coil of the first intermediate relay 1KA1 and the coil of the second intermediate relay 1KA2 are connected with a mains supply, the normally closed contact of the first intermediate relay 1KA1 is connected with the normally closed contact of the second intermediate relay 1KA2, the normally closed contact of the first intermediate relay 1KA1 is also connected with a power generation power supply, and the normally closed contact of the second intermediate relay 1KA2 is also connected with a second breaker S-QF.
In specific implementation, please refer to fig. 4, the detection relay KA includes a first intermediate relay 1KA1 and a second intermediate relay 1KA2, a normally closed contact of the second intermediate relay 1KA2 is connected in series with a coil of the second time relay 2KT and then connected with a second circuit breaker S-QF, whether a utility power is connected or not can be detected through the first intermediate relay 1KA1 and the second intermediate relay 1KA2, when the utility power is connected, the coil of the first intermediate relay 1KA1 and the coil of the second intermediate relay 1KA2 are both powered, so that the normally closed contact of the first intermediate relay 1KA1 and the normally closed contact of the second intermediate relay 1KA2 are both disconnected, thereby disconnecting the connection between the power generation power supply and the second circuit breaker F-QF, that is, the power generation power supply is disconnected, the utility power supply supplies power to the load, and prevents the utility power supply and the power generation power supply from running in parallel; when the mains supply is not connected or the mains supply is in fault, the coil of the first intermediate relay 1KA1 and the coil of the second intermediate relay 1KA2 are not electrified, so that the normally closed contact of the first intermediate relay 1KA1 and the normally closed contact of the second intermediate relay 1KA2 are kept closed, a power generation power supply and the second breaker F-QF are communicated, and the power generation power supply provides power generation voltage to supply power to a load; according to the logic, when the mains supply is recovered to be connected for supplying power, the power generation power supply is disconnected, and the mains supply preferentially supplies power to the load. The dual-insurance guarantee of the commercial power supply and the power generation power supply can be realized through the two intermediate relays, and the load is supplied by only one of the commercial power supply and the power generation power supply, so that the safety and reliability of the switching circuit of the commercial power generation power supply are effectively improved, and the safety and reliability of power supply are improved.
In specific implementation, a first breaker S-QF and a peripheral circuit thereof connected between a live wire S-L of a mains supply and a zero line S-N of the mains supply form an automatic control loop of the first breaker S-QF, and a second breaker F-QF and a peripheral circuit thereof connected between a live wire F-L of a power generation power supply and a zero line F-N of the power generation power supply form an automatic control loop of the second breaker F-QF.
The working principle of the commercial power generation power switching circuit will be briefly described with reference to fig. 4 as follows:
initial state: the commercial power is electrified, and the diesel generator is in a stop standby state.
When the switching control device is used manually, the mode conversion switch SA is switched to a manual gear position, and a user can respectively control the opening and closing of the first breaker S-QF and the second breaker F-QF through corresponding opening and closing buttons (a closing button 1SBC of the first breaker S-QF, an opening button 1SBS of the first breaker S-QF, a closing button 2SBC of the second breaker F-QF and an opening button 2SBS of the second breaker F-QF) on the low-voltage cabinet door, so that the switching of the mains supply and the power generation supply to supply power to the load through manual control is realized.
When the automatic switching device is used automatically, the mode switching switch SA is switched to an 'automatic' gear position, automatic control loops of a first breaker S-QF and a second breaker F-QF are both switched on, a coil of a first time relay 1KT in a mains supply control loop is electrified, a normally open contact of the first time relay 1KT is closed in a time-delay mode (the time-delay time is adjustable within 0-60 seconds), a closing coil X of the first breaker S-QF is switched on in a time-delay mode, the first breaker S-QF is closed, at the moment, mains supply supplies power to a load, meanwhile, coils of a relay KA (including a first intermediate relay 1KA1 and a second intermediate relay 1KA2) are electrified, a normally closed contact of the relay KA is detected to be switched off, the second breaker F-QF is cut off, and the mains supply and a generator are prevented from; when the mains supply fails, the undervoltage release of the first breaker S-QF acts to enable the first breaker S-QF to be opened, the normally closed auxiliary contact of the first breaker S-QF is reset and closed, so that the generator is started to generate power, meanwhile, the coil of the relay KA (comprising the first intermediate relay 1KA1 and the second intermediate relay 1KA2) is detected to lose power, the normally closed contact of the relay KA is detected to be reset and closed, so that the coil of the second time relay 2KT in the power generation control loop is powered on, the normally open contact of the second time relay 2KT is closed in a delayed mode (the delay time is 0-60 seconds adjustable), the closing coil X of the second breaker F-QF is switched on in a delayed mode, and the second breaker F-QF is switched on, and the generator generates power to supply power to a load; when the mains supply recovers the incoming call, a coil of the detection relay KA (comprising the first intermediate relay 1KA1 and the second intermediate relay 1KA2) is electrified, a normally closed contact of the detection relay KA is disconnected, an under-voltage release of the second breaker F-QF acts to enable the second breaker F-QF to be switched off, meanwhile, a coil of the first time relay 1KT of the mains supply control loop recovers the electrified state, a normally open contact of the first time relay 1KT is closed in a delayed mode, a closing coil of the first breaker S-QF is switched on, the mains supply is switched to supply power to the load, and a normally closed auxiliary contact of the first breaker S-QF is disconnected to enable the generator to stop, so that the mains supply and the generator are automatically switched to generate power, and the mains supply priority is guaranteed.
A second aspect of an embodiment of the present application provides a power distribution system, including: the power supply comprises a mains supply, a power generation supply, a load and a mains power generation supply switching circuit as described in any one of the above.
The embodiment of the application can automatically, quickly and effectively switch the commercial power supply and the power generation power supply to supply power to the load, has short power supply switching time and high efficiency, reduces the economic loss caused by overlong power supply switching time, reduces the cost, and improves the safety reliability and the practicability of a power distribution system.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (9)
1. The utility model provides a commercial power generation power supply switching circuit, is connected with commercial power supply, power generation power supply and load respectively, its characterized in that, commercial power generation power supply switching circuit includes:
a first circuit breaker connected to the commercial power source and the load, respectively, and configured to control a connection state between the commercial power source and the load;
the coil of the detection relay is connected with the mains supply and is configured to detect the mains supply voltage output by the mains supply and generate a mains supply detection signal;
the second circuit breaker is respectively connected with the first circuit breaker, the power generation source, the load and the detection relay and is configured to control the connection state between the power generation source and the load according to the commercial power detection signal; wherein the load is connected to at most one of the mains power supply and the power generation power supply.
2. The mains-generated power supply switching circuit of claim 1, further comprising:
the first time relay is respectively connected with the mains supply, the normally closed auxiliary contacts of the first circuit breaker and the second circuit breaker and is configured to be communicated with the closing coil of the first circuit breaker in a time-delay mode according to the mains supply voltage;
and the second time relay is respectively connected with the power generation power supply, the second circuit breaker, the normally closed auxiliary contact of the first circuit breaker and the normally closed contact of the detection relay and is configured to be communicated with the closing coil of the second circuit breaker in a time-delay manner according to the power generation voltage.
3. The mains-generated power supply switching circuit of claim 2, further comprising:
the mode conversion switch is respectively connected with the mains supply, the power generation supply, the first time relay and the second time relay and is configured to switch a power distribution mode according to a first input signal;
and the gate control assembly is respectively connected with the mode change-over switch, the normally closed auxiliary contact of the second circuit breaker, the first circuit breaker, the normally closed auxiliary contact of the first circuit breaker and the second circuit breaker and is configured to be communicated with the mains supply or the power generation power supply according to a second input signal.
4. The mains-generated power supply switching circuit of claim 1, further comprising:
and the first indicating circuit is respectively connected with the mains supply and the first circuit breaker and is configured to indicate the state of the first circuit breaker according to the mains voltage.
5. The mains-generated power supply switching circuit of claim 1, further comprising:
and the second indicating circuit is respectively connected with the power generation power supply and the second circuit breaker and is configured to indicate the state of the second circuit breaker according to the power generation voltage.
6. The mains-generated power supply switching circuit of claim 1, further comprising:
the first protection circuit is respectively connected with the mains supply, the detection relay and the first circuit breaker and is configured to perform overcurrent protection on the mains supply voltage;
and the second protection circuit is respectively connected with the power generation power supply and the second circuit breaker and is configured to perform overcurrent protection on the generated voltage.
7. The mains-generated power switching circuit of claim 1, wherein the detection relay comprises: a first intermediate relay and a second intermediate relay; wherein the content of the first and second substances,
the coil of first auxiliary relay with the coil of second auxiliary relay with mains power supply connects, the normally closed contact of first auxiliary relay with the normally closed contact of second auxiliary relay is connected, the normally closed contact of first auxiliary relay still with power generation source connects, the normally closed contact of second auxiliary relay still with the second circuit breaker is connected.
8. The mains power switching circuit of claim 1, wherein a mechanical interlock and an electrical interlock are further provided between the first circuit breaker and the second circuit breaker.
9. An electrical distribution system, comprising: a mains supply, a power generation supply, a load and a mains power generation supply switching circuit as claimed in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020563343.XU CN212012252U (en) | 2020-04-15 | 2020-04-15 | Commercial power generation power supply switching circuit and power distribution system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020563343.XU CN212012252U (en) | 2020-04-15 | 2020-04-15 | Commercial power generation power supply switching circuit and power distribution system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212012252U true CN212012252U (en) | 2020-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020563343.XU Active CN212012252U (en) | 2020-04-15 | 2020-04-15 | Commercial power generation power supply switching circuit and power distribution system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212012252U (en) |
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2020
- 2020-04-15 CN CN202020563343.XU patent/CN212012252U/en active Active
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