CN219322144U - Power supply circuit - Google Patents
Power supply circuit Download PDFInfo
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- CN219322144U CN219322144U CN202320266403.5U CN202320266403U CN219322144U CN 219322144 U CN219322144 U CN 219322144U CN 202320266403 U CN202320266403 U CN 202320266403U CN 219322144 U CN219322144 U CN 219322144U
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Abstract
The application discloses power supply circuit includes: the system comprises a first diesel generator, a first security PC section, a second security PC section, a first boiler PC section and a second boiler PC section; the first diesel generator is connected with a first connecting wire of a first security PC section through a first output bus and is connected with a second connecting wire of a second security PC section through the first output bus, a first monitoring relay is arranged on the first connecting wire and is used for monitoring the connection state of the first security PC section, and a second monitoring relay is arranged on the second connecting wire and is used for monitoring the connection state of the second security PC section; the first security PC section is connected with the first boiler PC section through a third connecting line, the second security PC section is connected with the second boiler PC section through a fourth connecting line, and the first boiler PC section is connected with the second boiler PC section. The embodiment ensures that the voltage of the bus of the security PC section is normal, thereby maintaining the user safety of the security system.
Description
Technical Field
The application belongs to the technical field of circuits, and particularly relates to a power supply circuit.
Background
In a power plant, a security system of a single unit is generally provided with two security sections, and each security section is correspondingly provided with a diesel generator to supply power to important loads of each system respectively. When the alternating current power supply is lost, the diesel generator can be started instantaneously, so that the power failure time is reduced to the shortest; meanwhile, a connecting switch is arranged between the two diesel generators for mutual standby, and the load of the other diesel generator can be automatically started and connected when one fault occurs. The load carried by the security section is basically I-type load, and a standby power supply (diesel generator) of the security system needs to be started quickly, effectively, reliably and safely, and if a power supply accident occurs, the safe operation of the unit can be seriously threatened.
Therefore, a mechanism is needed to ensure the normal voltage of the bus of the Power Center (PC) section, thereby maintaining the user safety of the security system and improving the reliable monitoring and operation stability of the standby Power supply of the security system.
Disclosure of Invention
The embodiment of the utility model provides a power supply circuit, which is used for ensuring the normal voltage of a bus of a security PC section, further maintaining the user safety of a security system and improving the reliable monitoring and operation stability of a standby power supply of the security system.
The embodiment of the utility model provides a power supply circuit, which comprises: the system comprises a first diesel generator, a first security power center PC section, a second security PC section, a first boiler PC section and a second boiler PC section; wherein,,
the first diesel generator is connected with a first connecting wire of a first security PC section through a first output bus and is connected with a second connecting wire of a second security PC section through the first output bus, a first monitoring relay is arranged on the first connecting wire and is used for monitoring the connection state of the first security PC section, and a second monitoring relay is arranged on the second connecting wire and is used for monitoring the connection state of the second security PC section;
the first security PC section is connected with the first boiler PC section through a third connecting line, the second security PC section is connected with the second boiler PC section through a fourth connecting line, and the first boiler PC section is connected with the second boiler PC section.
In one embodiment, a third monitoring relay is provided on the first output bus for monitoring the power output status of the first diesel generator.
In one embodiment, the power supply circuit further comprises a second diesel generator, a third security PC section, a fourth security PC section, a third boiler PC section, and a fourth boiler PC section; wherein,,
the first diesel generator is connected with the second diesel generator through a circuit breaker;
the second output bus of the second diesel generator is connected with a fifth connecting wire of a third security PC section and is connected with a sixth connecting wire of a fourth security PC section through the second output bus, a fourth monitoring relay is arranged on the fifth connecting wire and is used for monitoring the connection state of the third security PC section, and a fifth monitoring relay is arranged on the sixth connecting wire and is used for monitoring the connection state of the fourth security PC section;
the third security PC section is connected with the third boiler PC section through a seventh connecting line, the fourth security PC section is connected with the fourth boiler PC section through an eighth connecting line, and the third boiler PC section is connected with the fourth boiler PC section.
In one embodiment, a sixth monitoring relay is provided on the second output bus for monitoring the power output status of the second diesel generator.
In one embodiment, the first monitoring relay, the second monitoring relay and the third monitoring relay are all opening and closing power supply monitoring relays.
In one embodiment, the fourth monitoring relay, the fifth monitoring relay and the sixth monitoring relay are all opening and closing power supply monitoring relays.
In one embodiment, the first, second and third monitoring relays are each either a current monitoring relay or a voltage monitoring relay.
In one embodiment, the fourth, fifth and sixth monitoring relays are each either a current monitoring relay or a voltage monitoring relay.
In one embodiment, the third connection line and the fourth connection line are each provided with a circuit breaker, and the first boiler PC section is connected with the second boiler PC section through the circuit breaker.
In one embodiment, circuit breakers are provided on the seventh and eighth connection lines, and the third boiler PC section is connected to the fourth boiler PC section through circuit breakers.
According to the power supply circuit provided by the embodiment of the utility model, a first diesel generator is connected with a first connecting wire of a first security PC section through a first output bus and is connected with a second connecting wire of a second security PC section through the first output bus, a first monitoring relay is arranged on the first connecting wire and is used for monitoring the connection state of the first security PC section, and a second monitoring relay is arranged on the second connecting wire and is used for monitoring the connection state of the second security PC section; the first security PC section is connected with the first boiler PC section through a third connecting line, the second security PC section is connected with the second boiler PC section through a fourth connecting line, and the first boiler PC section is connected with the second boiler PC section; the monitoring relay is added between the security PC section and the diesel generator, so that the connection condition of the diesel security PC section can be monitored, the voltage and current signals after the diesel generator is started are guaranteed to be quickly fused with the bus voltage and current of the security PC section, the user safety of the security system is further guaranteed, and the reliable monitoring and operation stability of the standby power supply of the security system are improved.
Drawings
FIG. 1 is a schematic diagram of a power supply circuit in one embodiment of the present application;
FIG. 2 is a schematic diagram of a power supply circuit in another embodiment of the present application;
FIG. 3 is a schematic diagram of a power supply circuit according to yet another embodiment of the present application;
fig. 4 is a schematic diagram of a power supply circuit according to another embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type and not limited to the number of objects, e.g., the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
At present, when any section of bus of a 380V security PC loses electricity (the actual voltage is less than 50% of rated voltage, the rated voltage=400V and the duration is 3S), a diesel generator is spontaneously started, and after about 15S reaches rated parameters, an outlet switch of the diesel generator set and a wire inlet switch of the diesel generator to the security PC section are automatically closed. The diesel generator control loop realizes a self-starting cycle (namely three times of self-starting) within 60 seconds, and if the self-starting fails three times, a stop command is sent out, and the self-starting loop is locked and the other diesel generator is started in an interlocking way.
When the voltage of the power-losing bus is recovered, the PLC interface of the diesel generator on-site control cabinet confirms, at the moment, the PLC of the diesel generator issues a command to close a security section work incoming line switch, then the diesel generator is separated to a security PC section security incoming line switch and a diesel generator outlet switch, and after the diesel generator runs for 2min in an idle mode, the diesel generator set can be stopped. Under the condition that the outlet breaker is not automatically switched on, the fact that the outlet breaker of the diesel generator does not store energy is found, and the outlet breaker does not have standard reference quantity for normal standby; in addition, in the investigation of electrical hidden danger, the potential safety hazard that the contact point is not in place and can not be closed exists in the switching-on loop of the power inlet switch of the security PC section diesel generator. In view of the above, this embodiment provides a power supply circuit, by adding a monitoring relay and a position contact in a loop of a security system, in the process of total loss of power consumption of a unit plant, working power failure of the security system and regular test start of a diesel generator, according to the operation condition of a bus of a security PC section of the unit, a standby power supply of the security system, i.e. the diesel generator, can be started quickly, effectively, reliably and safely, the voltage of the bus of the security PC section is ensured to be normal, further the user safety of the security system is maintained, the reliable monitoring and operation stability of the standby power supply of the security system is improved, and the rejection rate of the security system is reduced.
Fig. 1 shows a power supply circuit according to an embodiment of the present utility model, including:
a first diesel generator 11, a first security power center PC section 12, a second security PC section 13, a first boiler PC section 14, and a second boiler PC section 15; wherein,,
the first diesel generator 11 is connected with a first connecting wire a2 of the first security PC section 12 through a first output bus a1, and is connected with a second connecting wire a3 of the second security PC section 13 through the first output bus a1, a first monitoring relay 16 is arranged on the first connecting wire a2 and used for monitoring the connection state of the first security PC section 12, and a second monitoring relay 17 is arranged on the second connecting wire a3 and used for monitoring the connection state of the second security PC section 13;
the first security PC section 12 is connected to the first boiler PC section 14 via a third connection line a4, the second security PC section 13 is connected to the second boiler PC section 15 via a fourth connection line a5, and the first boiler PC section 14 is connected to the second boiler PC section 15.
Specifically, the first diesel generator is connected with the first connecting wire of the first security PC section through the first output bus, and is connected with the second connecting wire of the second security PC section through the first output bus, and the first connecting wire is provided with a first monitoring relay, and the second connecting wire is provided with a second monitoring relay, so that the connection state of the first security PC section can be monitored through the first monitoring relay, whether the voltage of the first security PC section is normal or not is monitored, the connection state of the second security PC section can be monitored through the second monitoring relay, whether the voltage of the second security PC section is normal or not is monitored, user safety of the security system is guaranteed, and the reliable monitoring and operation stability of the standby power supply of the security system are improved.
In addition, first security PC section is connected with first boiler PC section through the third connecting wire, second security PC section is connected with second boiler PC section through the fourth connecting wire, just first boiler PC section with second boiler PC section is connected, has realized that first boiler PC section and second boiler PC section both can supply power to first security PC section and second security PC section.
Furthermore, in one embodiment, referring to fig. 2, a third monitoring relay 18 is provided on the first output bus a1 for monitoring the power output state of the first diesel generator 11.
Specifically, the third monitoring relay 18 is arranged on the first output bus a1, so that the power output state of the first diesel generator can be monitored through the third monitoring relay, the problem that the power supply of the security PC section is abnormal due to the fact that the connection of the first output bus of the diesel generator is interrupted is avoided, the voltage of the bus of the security PC section is ensured to be normal, and further the user safety of the security system is maintained.
In addition, in one embodiment, the first monitoring relay, the second monitoring relay and the third monitoring relay are all opening and closing power supply monitoring relays.
Like this first control relay, second control relay and third control relay are divide-shut brake power supply monitoring relay for can be through the control divide-shut brake power supply monitoring relay divide-shut brake state or the state of closing a floodgate, monitor diesel generator to the connected state of first security PC section and diesel generator to the connected state of second security PC section, thereby guarantee security PC section busbar's voltage is normal, and then maintain security system's user security.
Further, in one embodiment, the first, second and third monitoring relays are each either a current monitoring relay or a voltage monitoring relay.
Thus, the first monitoring relay, the second monitoring relay and the third monitoring relay are all current monitoring relays or voltage monitoring relays, so that the current or the voltage from the diesel generator to the first security PC section and the current or the voltage from the diesel generator to the second security PC section can be monitored through the current monitoring relays or the voltage monitoring relays, the connection state from the diesel generator to the first security PC section and the connection state from the diesel generator to the second security PC section are monitored, the normal voltage of buses of the security PC section is ensured, and the user safety of the security system is further maintained.
Furthermore, in one embodiment, referring to fig. 3, the power supply circuit further includes a second diesel generator 21, a third security PC section 22, a fourth security PC section 23, a third boiler PC section 24, and a fourth boiler PC section 25; wherein,,
the first diesel generator 11 is connected with the second diesel generator 21 through a breaker QF;
the second output bus b1 of the second diesel generator 21 is connected with the fifth connecting line b2 of the third security PC segment 22, and is connected with the sixth connecting line b3 of the fourth security PC segment 23 through the second output bus b1, and a fourth monitoring relay 26 is disposed on the fifth connecting line b2 for monitoring the connection state of the third security PC segment 22, and a fifth monitoring relay 27 is disposed on the sixth connecting line b3 for monitoring the connection state of the fourth security PC segment 23;
the third security PC section 22 is connected to the third boiler PC section 24 through a seventh connection line b4, the fourth security PC section 23 is connected to the fourth boiler PC section 25 through an eighth connection line b5, and the third boiler PC section 24 is connected to the fourth boiler PC section 25.
Specifically, the second output bus of the second diesel generator is connected with the fifth connecting wire of the third security PC section and is connected with the sixth connecting wire of the fourth security PC section through the second output bus, and the fourth monitoring relay is arranged on the fifth connecting wire, and the fifth monitoring relay is arranged on the sixth connecting wire, so that the connection state of the third security PC section can be monitored through the fourth monitoring relay, whether the voltage of the third security PC section is normal is monitored, the connection state of the fourth security PC section can be monitored through the fifth monitoring relay, whether the voltage of the fourth security PC section is normal is monitored, the user safety of the security system is guaranteed, and the reliable monitoring and the operation stability of the standby power supply of the security system are improved.
In addition, the third security PC section is connected with the third boiler PC section through a seventh connecting line, the fourth security PC section is connected with the fourth boiler PC section through an eighth connecting line, and the third boiler PC section is connected with the fourth boiler PC section, so that the third security PC section and the fourth security PC section can be powered by the third boiler PC section and the fourth security PC section.
In addition, the first diesel generator 11 is connected with the second diesel generator 21 through a circuit breaker, so that when one diesel generator fails, the load of the other diesel generator can be automatically started, and the two diesel generators are mutually standby through the configured connecting switch.
In addition, as an example, the diesel generator may be of the type S16R-Y1 PTA, and may be of the class B temperature rise rated power 1200kw,3 phase, 400v,50hz, power factor 0.8, star Y connection, neutral point direct ground, brushless excitation, insulation class H. In addition, the model of the diesel generator can also be 7M4054.
In the starting process of the diesel generator, when the voltage of any safety section is lower than 50% of rated voltage, the duration is 3S, a starting instruction of the diesel generator set is sent out, the diesel generator set is successfully self-started in 10S after receiving the starting instruction, a self-starting cycle (namely 3 times of self-starting) is realized in 60S, and the diesel generator can be fully loaded in 15S of the starting instruction. If the first diesel generator fails to be started automatically for three times, a stop signal is sent, the self-starting loop is locked, meanwhile, the second diesel generator connecting switch is switched on automatically, and the second diesel generator is connected. The starting mode may include: the diesel generator is forced to start at the central control room OPC disc, manually at the diesel generator control disc, or manually at the diesel generator body controller.
Further, in one embodiment, with continued reference to fig. 3, a sixth monitoring relay 28 is provided on the second output bus b1 for monitoring the power output status of the second diesel generator 21.
Specifically, by arranging the sixth monitoring relay 28 on the second output bus, the power output state of the second diesel generator can be monitored through the sixth monitoring relay, so that the problem that the power supply of the security PC section is abnormal due to the interruption of the connection of the second output bus of the diesel generator is avoided, the voltage of the bus of the security PC section is ensured to be normal, and the user safety of the security system is further maintained.
Further, in one embodiment, the fourth monitoring relay, the fifth monitoring relay, and the sixth monitoring relay are all opening and closing power supply monitoring relays.
Therefore, the fourth monitoring relay, the fifth monitoring relay and the sixth monitoring relay are all opening and closing power supply monitoring relays, so that the connection state from the diesel generator to the third security PC section and the connection state from the diesel generator to the fourth security PC section can be monitored through monitoring the opening and closing state or the closing state of the opening and closing power supply monitoring relays, the voltage of the bus of the security PC section is ensured to be normal, and the user safety of the security system is further maintained.
Further, in one embodiment, the fourth monitoring relay, the fifth monitoring relay, and the sixth monitoring relay are each a current monitoring relay or a voltage monitoring relay.
Thus, the fourth monitoring relay, the fifth monitoring relay and the sixth monitoring relay are all current monitoring relays or voltage monitoring relays, so that the currents or voltages from the second diesel generator to the third security PC section and from the second diesel generator to the fourth security PC section can be monitored through the current monitoring relays or the voltage monitoring relays, the connection state from the second diesel generator to the third security PC section and the connection state from the second diesel generator to the fourth security PC section are monitored, the normal voltage of buses of the security PC section is ensured, and the user safety of the security system is further maintained.
Furthermore, in one embodiment, with continued reference to fig. 3, a breaker QF is provided on each of the third and fourth connection lines a4, a5, and the first boiler PC section 14 is connected to the second boiler PC section 15 by the breaker QF.
Specifically, by providing the circuit breaker QF on both the third connecting line and the fourth connecting line, and the first boiler PC section 14 is connected with the second boiler PC section 15 through the circuit breaker QF, the connection between the first security PC section and the first boiler PC section, the connection between the second security PC section and the second boiler PC end, and the connection between the first boiler PC section and the second boiler PC section can be controlled by the circuit breaker.
Furthermore, in one embodiment, with continued reference to fig. 3, a circuit breaker QF is provided on each of the seventh and eighth connection lines b4, b5, and the third boiler PC section 24 is connected to the fourth boiler PC section 25 by a circuit breaker.
Specifically, by providing the circuit breaker QF on each of the seventh connection line and the eighth connection line, and the third boiler PC section 24 is connected to the fourth boiler PC section 25 through the circuit breaker, it is possible to control the connection between the third security PC section and the third boiler PC section, and the connection between the fourth security PC section and the fourth boiler PC section, and the connection between the third boiler PC section and the fourth boiler PC section through the circuit breaker.
In addition, referring to fig. 4, the dashed connection line in fig. 4 represents the control flow in the circuit to form the primary system of the security power supply, so in this embodiment, by using the coupling technology of the primary system and the secondary circuit of the security power supply, the position contact of the monitoring relay is added to the secondary circuit of the outlet circuit breaker of the diesel generator, and the monitoring relay is added to the switch-on loop switch of the inlet wire switch of the security PC section diesel generator power supply, so that the standby condition of the outlet circuit breaker of the diesel generator can be detected, the voltage and current signals after the diesel generator is started are ensured to be fused with the bus voltage and current of the security PC section, and the safety of the equipment and the stable operation of the unit are ensured; in addition, when a user monitors and operates related equipment of the security system, the position contact point of the monitoring relay can be effectively utilized, the visual degree is improved, the operation direction is definite, the quantitative analysis capability of relay protection data is enhanced, the relevance of the primary loop and the secondary loop is coupled, the equipment reliability is improved, the personnel logic judgment capability is enhanced, and equipment faults and unit power-down caused by abnormal judgment and processing are avoided.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.
Claims (10)
1. A power supply circuit, comprising: the system comprises a first diesel generator, a first security power center PC section, a second security PC section, a first boiler PC section and a second boiler PC section; wherein,,
the first diesel generator is connected with a first connecting wire of a first security PC section through a first output bus and is connected with a second connecting wire of a second security PC section through the first output bus, a first monitoring relay is arranged on the first connecting wire and is used for monitoring the connection state of the first security PC section, and a second monitoring relay is arranged on the second connecting wire and is used for monitoring the connection state of the second security PC section;
the first security PC section is connected with the first boiler PC section through a third connecting line, the second security PC section is connected with the second boiler PC section through a fourth connecting line, and the first boiler PC section is connected with the second boiler PC section.
2. The power supply circuit of claim 1, wherein a third monitoring relay is provided on the first output bus for monitoring the power output status of the first diesel generator.
3. The power supply circuit of claim 1, further comprising a second diesel generator, a third security PC section, a fourth security PC section, a third boiler PC section, and a fourth boiler PC section; wherein,,
the first diesel generator is connected with the second diesel generator through a circuit breaker;
the second output bus of the second diesel generator is connected with a fifth connecting wire of a third security PC section and is connected with a sixth connecting wire of a fourth security PC section through the second output bus, a fourth monitoring relay is arranged on the fifth connecting wire and is used for monitoring the connection state of the third security PC section, and a fifth monitoring relay is arranged on the sixth connecting wire and is used for monitoring the connection state of the fourth security PC section;
the third security PC section is connected with the third boiler PC section through a seventh connecting line, the fourth security PC section is connected with the fourth boiler PC section through an eighth connecting line, and the third boiler PC section is connected with the fourth boiler PC section.
4. A power supply circuit according to claim 3, wherein a sixth monitoring relay is provided on the second output bus for monitoring the power output status of the second diesel generator.
5. The power supply circuit of claim 2, wherein the first, second and third monitoring relays are all on-off power monitoring relays.
6. The power supply circuit of claim 4, wherein the fourth monitor relay, the fifth monitor relay, and the sixth monitor relay are all on-off power monitor relays.
7. The power supply circuit of claim 2, wherein the first monitor relay, the second monitor relay, and the third monitor relay are each a current monitor relay or a voltage monitor relay.
8. The power supply circuit of claim 4, wherein the fourth monitor relay, the fifth monitor relay, and the sixth monitor relay are each a current monitor relay or a voltage monitor relay.
9. The power supply circuit according to claim 1, wherein the third connection line and the fourth connection line are each provided with a circuit breaker, and the first boiler PC section is connected to the second boiler PC section through the circuit breaker.
10. A power supply circuit according to claim 3, wherein the seventh and eighth connection lines are each provided with a circuit breaker, and the third boiler PC section is connected to the fourth boiler PC section via a circuit breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320266403.5U CN219322144U (en) | 2023-02-20 | 2023-02-20 | Power supply circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320266403.5U CN219322144U (en) | 2023-02-20 | 2023-02-20 | Power supply circuit |
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| CN219322144U true CN219322144U (en) | 2023-07-07 |
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| CN202320266403.5U Active CN219322144U (en) | 2023-02-20 | 2023-02-20 | Power supply circuit |
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