CN210608675U - Nuclear power station dual power supply switching control circuit, switching device and power supply system - Google Patents
Nuclear power station dual power supply switching control circuit, switching device and power supply system Download PDFInfo
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- CN210608675U CN210608675U CN201921682979.XU CN201921682979U CN210608675U CN 210608675 U CN210608675 U CN 210608675U CN 201921682979 U CN201921682979 U CN 201921682979U CN 210608675 U CN210608675 U CN 210608675U
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Abstract
The utility model is suitable for a nuclear power station power transmission and distribution and protection technical field provides a nuclear power station dual supply switching control circuit, auto-change over device and power supply system, nuclear power station dual supply switching control circuit includes three control branch roads, first control branch road cluster is equipped with the control coil of change-over control switch and second power supply relay, second control branch road cluster is equipped with the first auxiliary contact of second power supply relay and the control coil of time relay, third control branch road cluster is equipped with time relay's time delay action contact and first power supply relay's control coil. And controlling the switching control switch to act, withdrawing the second power supply, and then putting the first power supply into operation after delaying for a certain time under the action of the time relay. Therefore, a time interval exists between the exit of the second power supply and the input of the first power supply, the residual voltage in the load can be guaranteed to be attenuated to 0 due to the existence of the time interval, the generation of impact current caused by the residual voltage is avoided, and the failure of power supply switching is further avoided.
Description
Technical Field
The application belongs to the technical field of power transmission and distribution and protection of nuclear power stations, and particularly relates to a dual-power switching control circuit, a switching device and a power supply system of a nuclear power station.
Background
In the nuclear power station, under the normal condition, a main power supply (namely a normal power supply) outputs power, and under the emergency condition, namely when the main power supply loses power supply, the emergency power supply needs to be powered down to replace the main power supply to output power supply, so that power is supplied to important loads at downstream. In a nuclear power plant, a main power supply is generally a low-voltage alternating-current power supply 380V system, an emergency power supply is generally a main switch station-ultrahigh voltage distribution device, and the specific equipment type of the distribution device is determined by actual needs. The downstream important loads include a bus GIS (gas insulated Switchgear) protection system, a transformer, a battery charger, an emergency lighting power supply, and the like. The GIS protection system is mainly used for tripping off related circuit breakers after an extra-high voltage bus (generally a 500KV bus) breaks down so as to protect power plant equipment.
And when the main power supply is recovered to be normal, the emergency power supply is replaced to supply power to the downstream important load. The existing switching mode of switching the emergency power supply to the main power supply is instantaneous action, namely, the main power supply is immediately switched on after the emergency power supply is disconnected. However, more inductive loads exist in the downstream important loads, such as: the transformer, which has a certain residual voltage in these inductive loads, may generate a large inrush current in the switching process, which may cause a circuit breaker in the downstream to trip, and a fuse to burn out, and finally cause a downstream power supply failure, i.e., a switching failure. If the switching process of the emergency power supply to the main power supply fails and the downstream power supply loses power, serious consequences can be brought, such as: the bus GIS protection system cannot work, once 500KV bus faults occur, power station equipment cannot be guaranteed to be in an isolation state, normal operation of a unit is affected, and even damage is caused.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present application provides a dual power supply switching control circuit, a switching device and a power supply system for a nuclear power station, so as to solve the problem that the switching failure is easily caused by the existing switching mode of switching an emergency power supply to a main power supply.
The first aspect of the embodiment of the present application provides a dual power supply switching control circuit for a nuclear power station, including:
the main contact of the first power supply relay is used for being connected in series with a first power supply circuit;
the main contact of the second power supply relay is used for being connected in series with a second power supply circuit;
a time relay;
a switching control switch;
the first control branch is provided with the switching control switch and a control coil of the second power supply relay in series;
the second control branch is provided with a first auxiliary contact of the second power supply relay and a control coil of the time relay in series; and
and the third control branch is provided with the time delay action contact of the time relay and the control coil of the first power supply relay in series.
Furthermore, the first auxiliary contact of the second power supply relay is a normally closed contact, and the delay action contact is a delay closed contact.
Further, the first control branch is also provided with a first auxiliary contact of the first power supply relay in series.
Further, the first auxiliary contact of the first power supply relay is a normally closed contact.
Furthermore, two ends of the delay action contact are connected in parallel with a second auxiliary contact of the first power supply relay.
Further, the second auxiliary contact of the first power supply relay is a normally open contact.
A second aspect of an embodiment of the present application provides a dual power switching device for a nuclear power plant, including:
the first power interface is used for connecting a first power supply;
the second power interface is used for connecting a second power supply;
a load interface for connecting a load;
one end of the first power supply circuit is connected with the first power interface, and the other end of the first power supply circuit is connected with the load interface;
one end of the second power supply circuit is connected with the second power interface, and the other end of the second power supply circuit is connected with the load interface; and
the dual power supply switching control circuit for the nuclear power plant is provided as the first aspect of the embodiment of the application.
A third aspect of an embodiment of the present application provides a dual power supply system for a nuclear power plant, including:
a first power supply;
a second power supply; and
the nuclear power plant double power supply switching device provided by the second aspect of the embodiment of the present application is described above.
Further, the second power source is a generator.
Further, the generator is a diesel generator.
The beneficial effects of the embodiment of the application are that: when the second power supply is required to be switched to the first power supply, the second power supply is set to be an emergency power supply, the first power supply is a main power supply, namely when the emergency power supply is switched to the main power supply, the switching control switch is controlled to act, the emergency power supply is withdrawn, and then the main power supply is switched on after a certain time delay based on the time delay function of the time relay. Therefore, a certain time interval exists between the emergency power supply exit and the main power supply input, even if an inductive load exists in the load, the existence of the time interval can ensure that the residual voltage in the load is attenuated to 0, so that the residual voltage is prevented from generating impact current, the residual voltage is attenuated to 0, the impact current can be prevented from generating, and the switching failure caused when the emergency power supply is switched to the main power supply is further prevented.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic circuit diagram of a first circuit structure of a dual power supply switching control circuit of a nuclear power plant according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a second circuit structure of a dual power supply switching control circuit of a nuclear power plant according to an embodiment of the present application;
fig. 3 is a schematic circuit structure diagram of a main power supply circuit of a dual power switching device of a nuclear power plant according to a second embodiment of the present application;
fig. 4 is a schematic circuit structure diagram of a main power supply circuit of a dual power supply system of a nuclear power plant according to a third embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
In order to explain the technical means described in the present application, the following description will be given by way of specific embodiments.
Referring to fig. 1, a schematic circuit structure of a dual power supply switching control circuit of a nuclear power plant according to an embodiment of the present application is shown. The dual power supply switching control circuit of the nuclear power station comprises a first power supply relay, a second power supply relay, a time relay, a switching control switch 101, a first control branch 1001, a second control branch 1002 and a third control branch 1003. The first power supply relay corresponds to the first power supply, and a main contact of the first power supply relay is used for being connected in series with a first power supply circuit and used as a power supply switch of the first power supply. The second power supply relay corresponds to the second power supply, and a main contact of the second power supply relay is used for being connected in series with a second power supply circuit and used as a power supply switch of the second power supply.
As shown in fig. 1, the first control branch 1001 is provided in series with the switching control switch 101 and the control coil 102 of the second power supply relay, the second control branch 1002 is provided in series with the first auxiliary contact 103 of the second power supply relay and the control coil 104 of the time relay, and the third control branch 1003 is provided in series with the delay operation contact 105 of the time relay and the control coil 106 of the first power supply relay.
Then, when the second power supply is switched to the first power supply, the switching control switch 101 is operated, the power-on state of the control coil 102 of the second power supply relay is changed, and the main contact of the second power supply relay is turned off, so that the second power supply is withdrawn. The on-off state of the first auxiliary contact 103 of the second power supply relay changes, the power-on state of the control coil 104 of the time relay correspondingly changes, the delay action contact 105 of the time relay acts after delaying for a certain time, and then the power-on state of the control coil 106 of the first power supply relay is controlled to change, the main contact of the first power supply relay is closed, and the first power supply is switched on. The specific type of each contact referred to in fig. 1 is determined on a case-by-case basis, provided that the above-described control procedure is satisfied.
Therefore, a certain time interval exists between the exit of the second power supply and the input of the first power supply, even if an inductive load exists in the load, the existence of the time interval can ensure that the residual voltage in the load is attenuated to 0, so that the generation of the impact current caused by the residual voltage is avoided, the residual voltage is attenuated to 0, the generation of the impact current is avoided, and the switching failure caused when the second power supply is switched to the first power supply is further avoided.
Fig. 2 is a schematic circuit diagram of a second circuit structure of the dual power supply switching control circuit of the nuclear power plant according to the first embodiment of the present application. The dual power supply switching control circuit of the nuclear power station comprises a first power supply relay, a second power supply relay, a time relay, a switching control switch 201, a first control branch 2001, a second control branch 2002 and a third control branch 2003. The first power supply relay corresponds to the first power supply, and a main contact of the first power supply relay is used for being connected in series with a first power supply circuit and used as a power supply switch of the first power supply. The second power supply relay corresponds to the second power supply, and a main contact of the second power supply relay is used for being connected in series with a second power supply circuit and used as a power supply switch of the second power supply.
As shown in fig. 2, the first control branch 2001 is provided with a switching control switch 201 and a control coil 202 of the second power supply relay in series. In one embodiment, the first control branch 2001 is further provided with a first auxiliary contact 203 of the first power supply relay in series, and the first auxiliary contact 203 of the first power supply relay is a normally closed contact.
The second control branch 2002 is provided in series with a first auxiliary contact 204 of the second mains supply relay and a control coil 205 of the time relay. In one embodiment, the first auxiliary contact 204 of the second mains power supply relay is a normally closed contact.
The third control branch 2003 is provided in series with a time delay operation contact 206 of the time relay and a control coil 207 of the first power supply relay. In one embodiment, the delay action contact 206 of the time relay is a delay closing contact, and the two ends of the delay action contact 206 of the time relay are connected in parallel with a second auxiliary contact 208 of the first power supply relay, and the second auxiliary contact 208 of the first power supply relay is a normally open contact.
Then, the switching control switch 201 is in the closed state under the normal condition, that is, under the condition that the second power supply is not switched to the first power supply, that is, under the condition that the second power supply supplies power normally. The switching control switch 201 is a start switch for switching power supplies, and the switching control switch 201 may be a manual switch and operated by human operation, or an electronic control switch and operated under the control of an external switching control command. In addition, the main contact of the first power supply relay and the main contact of the second power supply relay are both normally open contacts.
When the second power supply is required to be switched to the first power supply, the switching control switch 201 is controlled to be switched off, the control coil 202 of the second power supply relay loses power, the main contact of the second power supply relay is switched off, and the second power supply is withdrawn. Since the control coil 207 of the first power supply relay is in a power-off state at this time, the first auxiliary contact 203 of the first power supply relay is in a closed state. When the control coil 202 of the second mains supply relay is de-energized, the first auxiliary contact 204 of the second mains supply relay is changed from open to closed, and the control coil 205 of the time relay is energized. Since the delay action contact 206 of the time relay is a delay closing contact, the delay action contact 206 of the time relay is closed after delaying for a certain time, and the delay time can be set according to actual needs. When the time delay contact 206 of the time relay is closed, the control coil 207 of the first power supply relay is energized, the main contact of the first power supply relay is closed, and the first power supply is turned on. Moreover, the second auxiliary contact 208 of the first power supply relay is closed, so that a self-locking function is realized, and the control coil 207 of the first power supply relay is ensured to be in an electrified state. In addition, when the control coil 207 of the first power supply relay is energized, the first auxiliary contact 203 of the first power supply relay is opened, ensuring that the control coil 202 of the second power supply relay is in a de-energized state.
Therefore, a certain time interval exists between the exit of the second power supply and the input of the first power supply, even if an inductive load exists in the load, the existence of the time interval can ensure that the residual voltage in the load is attenuated to 0, so that the generation of the impact current caused by the residual voltage is avoided, the residual voltage is attenuated to 0, the generation of the impact current is avoided, and the switching failure caused when the second power supply is switched to the first power supply is further avoided.
The second embodiment of the application provides a nuclear power station dual-power-supply switching device, which comprises two parts, wherein the first part is a main power supply circuit, and the second part is a nuclear power station dual-power-supply switching control circuit.
As shown in fig. 3, the circuit structure of the first part includes a first power interface 301, a second power interface 302, a load interface 303, a first power supply line 304, and a second power supply line 305. The first power interface 301 is used for connecting a first power source, the second power interface 302 is used for connecting a second power source, and the load interface 303 is used for connecting a load. One end of the first power supply line 304 is connected with the first power interface 301, and the other end is connected with the load interface 303; one end of the second power supply line 305 is connected to the second power interface 302, and the other end is connected to the load interface 303.
As shown in fig. 1, the dual power supply switching control circuit of the nuclear power station includes a first power supply relay, a second power supply relay, a time relay, a switching control switch 101, a first control branch 1001, a second control branch 1002, and a third control branch 1003. The first power supply relay corresponds to a first power supply, and a main contact 306 of the first power supply relay is connected in series to a first power supply line 304 and serves as a power supply switch of the first power supply. The second power supply relay corresponds to a second power supply, and a main contact 307 of the second power supply relay is provided in series to the second power supply line 305 as a power supply switch of the second power supply.
As shown in fig. 1, the first control branch 1001 is provided in series with the switching control switch 101 and the control coil 102 of the second power supply relay, the second control branch 1002 is provided in series with the first auxiliary contact 103 of the second power supply relay and the control coil 104 of the time relay, and the third control branch 1003 is provided in series with the delay operation contact 105 of the time relay and the control coil 106 of the first power supply relay.
When the second power supply is switched to the first power supply, the switching control switch 101 is operated, the power-on state of the control coil 102 of the second power supply relay is changed, the main contact 307 of the second power supply relay is opened, and the second power supply is disconnected. The on-off state of the first auxiliary contact 103 of the second power supply relay changes, the power-on state of the control coil 104 of the time relay correspondingly changes, the delay action contact 105 of the time relay acts after delaying for a certain time, the power-on state of the control coil 106 of the first power supply relay is controlled to change, the main contact 306 of the first power supply relay is closed, and the first power supply is switched on. The specific type of each contact referred to in fig. 1 is determined on a case-by-case basis, provided that the above-described control procedure is satisfied.
Therefore, a certain time interval exists between the exit of the second power supply and the input of the first power supply, even if an inductive load exists in the load, the existence of the time interval can ensure that the residual voltage in the load is attenuated to 0, so that the generation of the impact current caused by the residual voltage is avoided, the residual voltage is attenuated to 0, the generation of the impact current is avoided, and the switching failure caused when the second power supply is switched to the first power supply is further avoided.
The second embodiment of the application provides a nuclear power station dual power supply switching device, which comprises two parts, wherein the first part is a main power supply circuit, and the second part is a nuclear power station dual power supply switching control circuit.
As shown in fig. 3, the circuit structure of the first part includes a first power interface 301, a second power interface 302, a load interface 303, a first power supply line 304, and a second power supply line 305. The first power interface 301 is used for connecting a first power source, the second power interface 302 is used for connecting a second power source, and the load interface 303 is used for connecting a load. One end of the first power supply line 304 is connected with the first power interface 301, and the other end is connected with the load interface 303; one end of the second power supply line 305 is connected to the second power interface 302, and the other end is connected to the load interface 303.
As shown in fig. 2, the dual power supply switching control circuit of the nuclear power plant includes a first power supply relay, a second power supply relay, a time relay, a switching control switch 201, a first control branch 2001, a second control branch 2002, and a third control branch 2003. The first power supply relay corresponds to a first power supply, and a main contact 306 of the first power supply relay is connected in series to a first power supply line 304 and serves as a power supply switch of the first power supply. The second power supply relay corresponds to a second power supply, and a main contact 307 of the second power supply relay is provided in series to the second power supply line 305 as a power supply switch of the second power supply.
As shown in fig. 2, the first control branch 2001 is provided with a switching control switch 201 and a control coil 202 of the second power supply relay in series. In one embodiment, the first auxiliary contact 203 of the first power supply relay is connected in series to the first control branch 2001, and the first auxiliary contact 203 of the first power supply relay is a normally closed contact.
The second control branch 2002 is provided in series with a first auxiliary contact 204 of the second mains supply relay and a control coil 205 of the time relay. In one embodiment, the first auxiliary contact 204 of the second mains power supply relay is a normally closed contact.
The third control branch 2003 is provided in series with a time delay operation contact 206 of the time relay and a control coil 207 of the first power supply relay. In one embodiment, the delay action contact 206 of the time relay is a delay closing contact, and the two ends of the delay action contact 206 of the time relay are connected in parallel with a second auxiliary contact 208 of the first power supply relay, and the second auxiliary contact 208 of the first power supply relay is a normally open contact.
Then, the switching control switch 201 is in the closed state under the normal condition, that is, under the condition that the second power supply is not switched to the first power supply, that is, under the condition that the second power supply supplies power normally. The switching control switch 201 is a start switch for switching power supplies, and the switching control switch 201 may be a manual switch and operated by human operation, or an electronic control switch and operated under the control of an external switching control command. In addition, the main contact 306 of the first power supply relay and the main contact 307 of the second power supply relay are both normally open contacts.
When the second power supply is required to be switched to the first power supply, the switching control switch 201 is controlled to be switched off, the control coil 202 of the second power supply relay loses power, the main contact 307 of the second power supply relay is switched off, and the second power supply is disconnected. Since the control coil 207 of the first power supply relay is in a power-off state at this time, the first auxiliary contact 203 of the first power supply relay is in a closed state. When the control coil 202 of the second mains supply relay is de-energized, the first auxiliary contact 204 of the second mains supply relay is changed from open to closed, and the control coil 205 of the time relay is energized. Since the delay action contact 206 of the time relay is a delay closing contact, the delay action contact 206 of the time relay is closed after delaying for a certain time, and the delay time can be set according to actual needs. When the time delay contact 206 of the time relay is closed, the control coil 207 of the first mains supply relay is energized, the main contact 306 of the first mains supply relay is closed, and the first mains supply is switched on. Moreover, the second auxiliary contact 208 of the first power supply relay is closed, so that a self-locking function is realized, and the control coil 207 of the first power supply relay is ensured to be in an electrified state. In addition, when the control coil 207 of the first power supply relay is energized, the first auxiliary contact 203 of the first power supply relay is opened, ensuring that the control coil 202 of the second power supply relay is in a de-energized state.
Therefore, a certain time interval exists between the exit of the second power supply and the input of the first power supply, even if an inductive load exists in the load, the existence of the time interval can ensure that the residual voltage in the load is attenuated to 0, so that the generation of the impact current caused by the residual voltage is avoided, the residual voltage is attenuated to 0, the generation of the impact current is avoided, and the switching failure caused when the second power supply is switched to the first power supply is further avoided.
The third embodiment of the application provides a nuclear power station dual power supply system, which comprises two parts, wherein the first part is a main power supply circuit, and the second part is a nuclear power station dual power supply switching control circuit. The main power supply circuit of the dual power supply system of the nuclear power station comprises a first power supply 408, a second power supply 409 and the main power supply circuit of the dual power supply switching device of the nuclear power station. Thus, it can be understood that: the nuclear power plant dual power supply system comprises a first power supply 408, a second power supply 409 and a nuclear power plant dual power switching device.
In one embodiment, the second power source 409 is an emergency power source, such as: a generator, in particular a diesel generator. And the first power supply 408 is a main power supply, such as: and (5) supplying power to a power grid.
As shown in fig. 4, the main power supply circuit of the dual power supply system of the nuclear power station includes a first power source 408, a second power source 409, a first power interface 401, a second power interface 402, a load interface 403, a first power supply line 404 and a second power supply line 405. The first power interface 401 is connected to a first power source 408, the second power interface 402 is connected to a second power source 409, and the load interface 403 is used for connecting a load, such as: the emergency lighting system comprises a bus GIS protection system, a 125V inverter, a 125V storage battery charger and an emergency lighting power supply, wherein the GIS protection system is mainly used for tripping off related circuit breakers after a 500KV bus fails to work, and protecting power plant equipment. One end of the first power supply line 404 is connected to the first power interface 401 (i.e. connected to the first power source 408), and the other end is connected to the load interface 403; one end of the second power supply line 405 is connected to the second power interface 402 (i.e. connected to the second power source 409), and the other end is connected to the load interface 403.
As shown in fig. 1, the dual power supply switching control circuit of the nuclear power station includes a first power supply relay, a second power supply relay, a time relay, a switching control switch 101, a first control branch 1001, a second control branch 1002, and a third control branch 1003. The first power supply relay corresponds to the first power supply 408, and the main contact 406 of the first power supply relay is serially connected to the first power supply line 404 to serve as a power supply switch of the first power supply 408. The second power supply relay corresponds to the second power supply 409, and a main contact 407 of the second power supply relay is connected in series to the second power supply line 405 to serve as a power supply switch of the second power supply 409.
As shown in fig. 1, the first control branch 1001 is provided in series with the switching control switch 101 and the control coil 102 of the second power supply relay, the second control branch 1002 is provided in series with the first auxiliary contact 103 of the second power supply relay and the control coil 104 of the time relay, and the third control branch 1003 is provided in series with the delay operation contact 105 of the time relay and the control coil 106 of the first power supply relay.
When the second power supply 409 is switched to the first power supply 408, the switching control switch 101 is operated, the power-on state of the control coil 102 of the second power supply relay is changed, the main contact 407 of the second power supply relay is opened, and the second power supply 409 is disconnected. The on-off state of the first auxiliary contact 103 of the second power supply relay changes, the power-on state of the control coil 104 of the time relay correspondingly changes, the delay action contact 105 of the time relay acts after delaying for a certain time, and then the power-on state of the control coil 106 of the first power supply relay is controlled to change, the main contact 406 of the first power supply relay is closed, and the first power supply 408 is switched on. The specific type of each contact referred to in fig. 1 is determined on a case-by-case basis, provided that the above-described control procedure is satisfied.
Therefore, a certain time interval exists between the exit of the second power source 409 and the input of the first power source 408, even if an inductive load exists in the load, the existence of the time interval can ensure that the residual voltage in the load is attenuated to 0, so that the generation of the surge current caused by the residual voltage is avoided, the attenuation of the residual voltage to 0 can avoid the generation of the surge current, and the switching failure caused when the second power source 409 is switched to the first power source 408 is further avoided.
The second nuclear power station dual-power-supply system comprises two parts, wherein the first part is a main power supply circuit, and the second part is a nuclear power station dual-power-supply switching control circuit. The main power supply circuit of the dual power supply system of the nuclear power station comprises a first power supply 408, a second power supply 409 and the main power supply circuit of the dual power supply switching device of the nuclear power station. Thus, it can be understood that: the nuclear power plant dual power supply system comprises a first power supply 408, a second power supply 409 and a nuclear power plant dual power switching device.
In one embodiment, the second power source 409 is an emergency power source, such as: a generator, in particular a diesel generator. And the first power supply 408 is a main power supply, such as: and (5) supplying power to a power grid.
As shown in fig. 4, the main power supply circuit of the dual power supply system of the nuclear power station includes a first power source 408, a second power source 409, a first power interface 401, a second power interface 402, a load interface 403, a first power supply line 404 and a second power supply line 405. The first power interface 401 is connected to a first power source 408, the second power interface 402 is connected to a second power source 409, and the load interface 403 is used for connecting a load, such as: the emergency lighting system comprises a bus GIS protection system, a 125V inverter, a 125V storage battery charger and an emergency lighting power supply, wherein the GIS protection system is mainly used for tripping off related circuit breakers after a 500KV bus fails to work, and protecting power plant equipment. One end of the first power supply line 404 is connected to the first power interface 401 (i.e. connected to the first power source 408), and the other end is connected to the load interface 403; one end of the second power supply line 405 is connected to the second power interface 402 (i.e. connected to the second power source 409), and the other end is connected to the load interface 403.
As shown in fig. 2, the dual power supply switching control circuit of the nuclear power plant includes a first power supply relay, a second power supply relay, a time relay, a switching control switch 201, a first control branch 2001, a second control branch 2002, and a third control branch 2003. The first power supply relay corresponds to the first power supply 408, and the main contact 406 of the first power supply relay is serially connected to the first power supply line 404 to serve as a power supply switch of the first power supply 408. The second power supply relay corresponds to the second power supply 409, and a main contact 407 of the second power supply relay is connected in series to the second power supply line 405 to serve as a power supply switch of the second power supply 409.
As shown in fig. 2, the first control branch 2001 is provided with a switching control switch 201 and a control coil 202 of the second power supply relay in series. In one embodiment, the first auxiliary contact 203 of the first power supply relay is connected in series to the first control branch 2001, and the first auxiliary contact 203 of the first power supply relay is a normally closed contact.
The second control branch 2002 is provided in series with a first auxiliary contact 204 of the second mains supply relay and a control coil 205 of the time relay. In one embodiment, the first auxiliary contact 204 of the second mains power supply relay is a normally closed contact.
The third control branch 2003 is provided in series with a time delay operation contact 206 of the time relay and a control coil 207 of the first power supply relay. In one embodiment, the delay action contact 206 of the time relay is a delay closing contact, and the two ends of the delay action contact 206 of the time relay are connected in parallel with a second auxiliary contact 208 of the first power supply relay, and the second auxiliary contact 208 of the first power supply relay is a normally open contact.
Then, the switching control switch 201 is in the closed state under the normal condition, that is, under the condition that the second power source 409 is not switched to the first power source 408, that is, under the condition that the second power source 409 supplies power normally. The switching control switch 201 is a start switch for switching power supplies, and the switching control switch 201 may be a manual switch and operated by human operation, or an electronic control switch and operated under the control of an external switching control command. In addition, the main contact 406 of the first power supply relay and the main contact 407 of the second power supply relay are both normally open contacts.
When the second power supply 409 needs to be switched to the first power supply 408, the switching control switch 201 is controlled to be switched off, the control coil 202 of the second power supply relay loses power, the main contact 407 of the second power supply relay is switched off, and the second power supply 409 exits. Since the control coil 207 of the first power supply relay is in a power-off state at this time, the first auxiliary contact 203 of the first power supply relay is in a closed state. When the control coil 202 of the second mains supply relay is de-energized, the first auxiliary contact 204 of the second mains supply relay is changed from open to closed, and the control coil 205 of the time relay is energized. Since the delay action contact 206 of the time relay is a delay closing contact, the delay action contact 206 of the time relay is closed after delaying for a certain time, and the delay time can be set according to actual needs. When the time delay contact 206 of the time relay is closed, the control coil 207 of the first mains supply relay is energized, the main contact 406 of the first mains supply relay is closed, and the first power supply 408 is switched on. Moreover, the second auxiliary contact 208 of the first power supply relay is closed, so that a self-locking function is realized, and the control coil 207 of the first power supply relay is ensured to be in an electrified state. In addition, when the control coil 207 of the first power supply relay is energized, the first auxiliary contact 203 of the first power supply relay is opened, ensuring that the control coil 202 of the second power supply relay is in a de-energized state.
Therefore, a certain time interval exists between the exit of the second power source 409 and the input of the first power source 408, even if an inductive load exists in the load, the existence of the time interval can ensure that the residual voltage in the load is attenuated to 0, so that the generation of the surge current caused by the residual voltage is avoided, the attenuation of the residual voltage to 0 can avoid the generation of the surge current, and the switching failure caused when the second power source 409 is switched to the first power source 408 is further avoided.
The above 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 will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may 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 (10)
1. A nuclear power station dual power supply switching control circuit is characterized by comprising:
the main contact of the first power supply relay is used for being connected in series with a first power supply circuit;
the main contact of the second power supply relay is used for being connected in series with a second power supply circuit;
a time relay;
a switching control switch;
the first control branch is provided with the switching control switch and a control coil of the second power supply relay in series;
the second control branch is provided with a first auxiliary contact of the second power supply relay and a control coil of the time relay in series; and
and the third control branch is provided with the time delay action contact of the time relay and the control coil of the first power supply relay in series.
2. The dual power supply switching control circuit of the nuclear power plant as claimed in claim 1, wherein the first auxiliary contact of the second power supply relay is a normally closed contact, and the delay action contact is a delay closing contact.
3. The dual power switching control circuit of nuclear power plant as claimed in claim 2, wherein said first control branch is further provided in series with a first auxiliary contact of said first power supply relay.
4. The dual power supply switching control circuit of nuclear power plant as recited in claim 3, wherein the first auxiliary contact of the first power supply relay is a normally closed contact.
5. The dual power supply switching control circuit of the nuclear power plant as claimed in claim 2, wherein a second auxiliary contact of the first power supply relay is connected in parallel to two ends of the delay action contact.
6. The dual power supply switching control circuit of nuclear power plant as recited in claim 5, wherein the second auxiliary contact of the first power supply relay is a normally open contact.
7. A nuclear power station duplicate supply switching device is characterized by comprising:
the first power interface is used for connecting a first power supply;
the second power interface is used for connecting a second power supply;
a load interface for connecting a load;
one end of the first power supply circuit is connected with the first power interface, and the other end of the first power supply circuit is connected with the load interface;
one end of the second power supply circuit is connected with the second power interface, and the other end of the second power supply circuit is connected with the load interface; and
the nuclear power plant double power supply switching control circuit as claimed in any one of claims 1 to 6.
8. A dual power supply system for a nuclear power plant, comprising:
a first power supply;
a second power supply; and
the dual power switching device of a nuclear power plant as claimed in claim 7.
9. The dual power supply system of a nuclear power plant as recited in claim 8, wherein the second power source is a generator.
10. The dual power supply system of a nuclear power plant of claim 9, wherein the generator is a diesel generator.
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| CN201921682979.XU CN210608675U (en) | 2019-10-09 | 2019-10-09 | Nuclear power station dual power supply switching control circuit, switching device and power supply system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505370A (en) * | 2020-12-09 | 2021-03-16 | 贵州天义电器有限责任公司 | Electron conversion auxiliary contact detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505370A (en) * | 2020-12-09 | 2021-03-16 | 贵州天义电器有限责任公司 | Electron conversion auxiliary contact detection device |
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