CN219351272U - Protection loop for avoiding load of high-temperature pile generator alone with factory - Google Patents
Protection loop for avoiding load of high-temperature pile generator alone with factory Download PDFInfo
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- CN219351272U CN219351272U CN202320549959.5U CN202320549959U CN219351272U CN 219351272 U CN219351272 U CN 219351272U CN 202320549959 U CN202320549959 U CN 202320549959U CN 219351272 U CN219351272 U CN 219351272U
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Abstract
The embodiment of the disclosure provides a protection loop for avoiding a high-temperature pile generator from independently carrying factory loads, which comprises a normally closed auxiliary contact of a current relay, a normally closed auxiliary contact of a line switch and a relay protection device, wherein the normally closed auxiliary contact of the current relay, the normally closed auxiliary contact of the line switch and the relay protection device are electrically connected in sequence and form a series loop; the main transformer high-voltage side switch is connected with the circuit switch in parallel; the relay protection device is used for generating a logic switch signal and controlling the on state of the factory load, the generator, the main transformer, the auxiliary transformer and the factory standby power supply according to the logic switch signal. Through each auxiliary contact and the relay protection device which are arranged to form a loop, the working condition of the independent load of the high-temperature stack generator with the plant can be accurately judged, the relay protection device is utilized to cut off the generator and the transformer, and meanwhile, the standby power supply for the plant is put into operation, so that the stable operation of the load of the plant is ensured.
Description
Technical Field
The embodiment of the disclosure belongs to the technical field of high-temperature stacks, and particularly relates to a protection circuit for avoiding load of a high-temperature stack generator alone with a factory.
Background
In the high-temperature gas cooled reactor, the working condition that the generator alone carries the load of the plant refers to the working condition that the unit rapidly throws the load to carry the power of the plant, namely the common island working condition (FASTCUT BACK, FCB). The basic functions of the control are: when the unit operates under the normal working condition, if the generator or the external power grid is disconnected, the FCB function of the unit is automatically put into operation, rapidly throws load and stably operates with the power for the plant. In the load shedding process of the unit, the change of the running parameters of the unit can be ensured to be within a safe range, and the shutdown and shutdown protection action is not caused, so that the safety of equipment is not endangered, and the quick grid-connected power generation can be realized. The FCB is load control of the unit under abnormal working conditions, integrates analog quantity control and switching value control, and is a complex load control system. The method is completed by coordinated work of a turbine protection system, a bypass control system, a generator excitation regulating system and the like.
The FCB has more complicated control, more involved systems, larger influence on the running condition of the unit, shorter duration of the whole control process and larger impact on the service life of equipment, the reactivity of a reactor, the control and an electric system, so that the high-temperature reactor generator alone has high risk of the working condition of the factory load. Since the capacity of the domestic power grid is large, it is not necessary to install FCB functions for the machine set.
Based on this, embodiments of the present disclosure design a circuit that protects a thermopile without having to install FCB functions.
Disclosure of Invention
Embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art, and provide a protection circuit for avoiding the load of a high-temperature stack generator alone.
The embodiment of the disclosure provides a protection loop for avoiding a high-temperature reactor generator from independently carrying a plant load, wherein the high-temperature reactor is powered by an external electric network line switch to the plant load through a main transformer and an auxiliary transformer, the high-temperature reactor is powered by a generator to the plant load through the auxiliary transformer, a high-voltage side of the main transformer is connected with a high-voltage side switch of the main transformer in series, a low-voltage side of the main transformer is connected with a current relay in series, and an outlet end of the generator is connected with an outlet switch of the generator in series; the protection circuit comprises a normally closed auxiliary contact of the current relay, a normally closed auxiliary contact of the line switch and a relay protection device which are electrically connected in sequence and form a series circuit; the protection loop also comprises normally closed auxiliary contacts of the main transformer high-voltage side switch, which are connected in parallel with the two ends of the normally closed auxiliary contacts of the line switch; wherein,,
the relay protection device is used for generating a logic switch signal according to the states of the normally-closed auxiliary contacts of the current relay, the line switch and the main transformer high-voltage side switch, and controlling the on states of the plant load, the generator, the main transformer, the auxiliary transformer and the plant standby power supply according to the logic switch signal.
Optionally, when any one of the current relay, the line switch and the main transformer high-voltage side switch is in an off state, the relay protection device disconnects the plant load from the auxiliary transformer, and connects the plant standby power supply to the plant load.
Optionally, the protection circuit further comprises a circuit controller;
the loop controller is connected in series between the normally closed auxiliary contact of the line switch and the relay protection device and is used for controlling the protection loop to be put into or out of a use state.
Optionally, the loop controller is configured as a knife switch.
Optionally, the line switch includes a first line switch and a second line switch forming a parallel loop;
the protection circuit further comprises a normally closed auxiliary contact of the first line switch and a normally closed auxiliary contact of the second line switch which are connected in series.
Optionally, the protection circuit further comprises a delay device;
the relay protection device is electrically connected with the relay protection device, so that when any one of the current relay, the line switch and the main transformer high-voltage side switch is in an off state, the normally-closed auxiliary contact is controlled to be in a delayed mode, and the relay protection device is controlled to disconnect the plant load from the auxiliary transformer.
Optionally, the protection circuit further comprises a fast cutting device;
the quick-cutting device is electrically connected with the relay protection device, so that after the relay protection device disconnects the plant load from the auxiliary transformer, the plant standby power supply is quickly controlled to be conducted with the plant load.
According to the protection circuit for avoiding the load of the high-temperature stack generator alone from being carried with the plant, the normally closed auxiliary contact of the current relay, the normally closed auxiliary contact of the line switch and the relay protection device which are electrically connected in sequence and form the series circuit, and the normally closed auxiliary contact of the main transformer high-voltage side switch which is connected in parallel with the two ends of the normally closed auxiliary contact of the line switch can accurately judge the working condition of the high-temperature stack generator alone from being carried with the plant, primary equipment such as the generator, the main transformer and the auxiliary transformer is cut off by the relay protection device, and meanwhile, the auxiliary power supply is put into the plant, so that the stable operation of the plant load is ensured, and the working condition of the high-temperature stack generator alone with the plant load is effectively avoided.
Drawings
FIG. 1 is a schematic diagram of a circuit connection structure of a thermopile according to an embodiment of the disclosure;
fig. 2 is a schematic diagram of the composition of a protection circuit according to another embodiment of the present disclosure.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present disclosure, the present disclosure will be described in further detail with reference to the accompanying drawings and detailed description.
As shown in fig. 1 and 2, a protection circuit for avoiding the load of the plant alone of a high-temperature reactor generator is provided, wherein the high-temperature reactor is powered by an external electric network line switch 110 to the load 140 of the plant through a main transformer 120 and an auxiliary transformer 130, and the high-temperature reactor is also powered by a generator 150 to the load 140 of the plant through the auxiliary transformer 130. The high-voltage side of the main transformer 120 is connected with a main transformer high-voltage side switch 121, and the low-voltage side of the main transformer 120 is connected with a current relay 122. The outlet end of the generator 150 is connected in series with a generator outlet switch 151.
The protection circuit includes a normally closed auxiliary contact 210 of the current relay, a normally closed auxiliary contact 220 of the line switch, and a relay protection device 230, which are electrically connected in sequence and form a series circuit. The protection circuit further includes a normally closed auxiliary contact 240 of the main transformer high side switch connected in parallel to both ends of the normally closed auxiliary contact 220 of the line switch. The relay protection device 230 is configured to generate a logic switching signal according to the states of the current relay 122, the line switch 110, and the normally-closed auxiliary contacts (210, 220, 240) of the main transformer high-voltage side switch 121, and control the conduction states of the plant load 140 and the generator 150, the main transformer 120, the auxiliary transformer 130, and the plant backup power supply according to the logic switching signal.
Specifically, as shown in fig. 1 and 2, during the operation of the high-temperature stack, the high-temperature stack is powered by the external grid line switch 110 to the plant load through the main transformer 120 and the auxiliary transformer 120 in sequence, and is powered by the generator 150 to the plant load 140 through the auxiliary transformer 130. A main transformer high-voltage side switch 121 is connected in series with the high-voltage side of the main transformer 120, a current relay 122 is connected in series with the low-voltage side of the main transformer 120, and a generator outlet switch 151 is connected in series with the outlet end of the generator 150. The relay protection device 230 forms a protection loop by being connected with auxiliary contacts of the line switch 110, the main transformer high-voltage side switch 121 and the current relay 122.
As shown in fig. 2, the protection circuit includes a normally closed auxiliary contact 210 of a current relay, a normally closed auxiliary contact 220 of a line switch, and a relay protection device 230, which are electrically connected in sequence and form a series circuit. Further, the normally closed auxiliary contacts 240 of the main transformer high voltage side switch are connected in parallel to both ends of the normally closed auxiliary contacts 220 of the line switch. The relay protection device 230 may generate a logic switching signal according to the states of the current relay 122, the line switch 110, and the normally closed auxiliary contacts (210, 220, 240) of the main transformer high voltage side switch 121, and control the on states of the plant load 140 and the generator 150, the main transformer 120, the auxiliary transformer 130, and the plant backup power source according to the generated logic switching signal. The working condition that the high-temperature pile generator alone carries the load of the factory can be judged, the relay protection device is utilized to cut off the conduction of primary equipment such as the generator, the main transformer, the auxiliary transformer and the like and the load of the factory, and meanwhile, the standby power supply for the factory is put into the factory to conduct the load of the factory, so that the stable operation of the load of the factory is ensured, and the working condition that the high-temperature pile generator alone carries the load of the factory is effectively avoided.
Further, when any one of the normally closed auxiliary contacts (210, 220, 240) of the current relay 122, the line switch 110, and the main transformer high-voltage side switch 121 is in an off state, the relay protection device 230 disconnects the plant load 140 from the auxiliary transformer 130 and turns on the plant backup power source from the plant load 140. That is, if any one of the current relay 122, the line switch 110 and the main transformer high voltage side switch 121 is opened during operation of the thermopile, the corresponding auxiliary contact (210, 220, 240) is followed to be opened. At this time, the relay protection device 230 in the protection loop judges that the high-temperature stack generator 150 is in the working condition of independently carrying the load for the plant, and controls the load 140 for the plant to be disconnected from the auxiliary transformer 130, so that the island operation of the generator is avoided. And connecting the plant backup power source to the plant load 140.
According to the protection circuit for avoiding the independent load of the high-temperature pile generator with the factory, the working condition of the independent load of the high-temperature pile generator with the factory can be accurately judged, the relay protection device is utilized to cut off primary equipment such as the generator, the main transformer and the auxiliary transformer, and meanwhile, the auxiliary power supply is put into the factory to ensure the stable operation of the load of the factory, the circuit is simple in structure, low in misoperation probability, safe and reliable in overall performance, and the working condition of the independent load of the high-temperature pile generator with the factory is effectively avoided.
Further, as shown in fig. 1 and 2, the line switch 110 includes a first line switch 111 and a second line switch 112 that form a parallel loop. The protection circuit further includes a normally closed auxiliary contact 221 of the first line switch and a normally closed auxiliary contact 222 of the second line switch connected in series.
Providing the first line switch 111 and the second line switch 112 forming a parallel circuit, and the normally closed auxiliary contact 221 of the first line switch and the normally closed auxiliary contact 222 of the second line switch in series can improve the fault tolerance of the protection circuit. That is, one of the first line switch 111 and the second line switch 112 fails to open, and the corresponding one of the normally closed auxiliary contact 221 of the first line switch and the normally closed auxiliary contact 222 of the second line switch is also open, but the relay protection device 230 does not operate, and normal operation of the high-temperature stack is not affected.
Illustratively, as shown in FIG. 2, the protection circuit further includes a circuit controller 250. The loop controller 250 is serially arranged between the normally closed auxiliary contact 220 of the line switch and the relay protection device 230, and is used for controlling the protection loop to be put into or out of a use state.
Specifically, as shown in fig. 2, a loop controller 250 is connected in series between the normally closed auxiliary contact 220 of the line switch and the relay protection device 230. The loop controller 250 is used for controlling the use state of the protection loop, and controlling the protection loop to be put into use or taken out of use. When the protection circuit is required to be put into operation, the protection circuit is put into operation by the circuit controller 250. When the protection circuit is not required to be used, the protection circuit is taken out of use by the circuit controller 250. As a specific example, the loop controller 250 may be configured as a knife switch to manually control the protection loop to be thrown or withdrawn. The loop controller can prevent the misoperation of the protection loop when the load of the plant is low or other conditions occur, and freely control the input or the withdrawal of the protection loop to be in use, so that the control mode is flexible, and the stability of the protection loop is enhanced.
Illustratively, the protection circuit further includes a delayer (not shown). The delayer is electrically connected to the relay protection device 230, so as to delay and control the relay protection device 230 to disconnect the plant load 140 from the auxiliary transformer 130 when any one of the normally closed auxiliary contacts (210, 220, 240) of the current relay 122, the line switch 110 and the main transformer high-voltage side switch 121 is in an off state. The arrangement can better ensure that the change of the operation parameters of the high-temperature reactor unit is in a safe range, and the shutdown and shutdown protection action is not caused, so that the safety of equipment is not endangered.
Further, the protection circuit also comprises a fast cutting device (not shown in the figures). The fast-cutting device is electrically connected to the relay protection device 230, so as to rapidly control the connection between the standby power supply and the auxiliary transformer 130 after the relay protection device 230 disconnects the auxiliary transformer 130 from the auxiliary load 140. The arrangement can effectively prevent the power loss of the load of the factory, can better ensure that the high-temperature reactor unit can continuously run, and avoid equipment damage caused by power supply switching.
It is to be understood that the above embodiments are merely exemplary embodiments employed to illustrate the principles of the present disclosure, however, the present disclosure is not limited thereto. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the disclosure, and are also considered to be within the scope of the disclosure.
Claims (7)
1. The protection circuit is used for avoiding that a high-temperature pile generator independently carries a plant load, wherein the high-temperature pile is powered by an external network line switch to the plant load through a main transformer and an auxiliary transformer, the high-temperature pile is powered by a generator to the plant load through the auxiliary transformer, a high-voltage side of the main transformer is connected with a high-voltage side switch of the main transformer in series, a low-voltage side of the main transformer is connected with a current relay in series, and an outlet end of the generator is connected with an outlet switch of the generator in series; the protection circuit is characterized by comprising a normally closed auxiliary contact of the current relay, a normally closed auxiliary contact of the line switch and a relay protection device which are electrically connected in sequence and form a series circuit; the protection loop also comprises normally closed auxiliary contacts of the main transformer high-voltage side switch, which are connected in parallel with the two ends of the normally closed auxiliary contacts of the line switch; wherein,,
the relay protection device is used for generating a logic switch signal according to the states of the normally-closed auxiliary contacts of the current relay, the line switch and the main transformer high-voltage side switch, and controlling the on states of the plant load, the generator, the main transformer, the auxiliary transformer and the plant standby power supply according to the logic switch signal.
2. The protection circuit for preventing a high-temperature stack generator from being loaded by a plant alone according to claim 1, wherein the relay protection device disconnects the plant load from the auxiliary transformer and connects the plant backup power source to the plant load when any one of the normally closed auxiliary contacts of the current relay, the line switch, and the main transformer high-voltage side switch is in an off state.
3. The protection circuit for avoiding plant load on a thermopile generator alone according to claim 1 or 2, characterized in that the protection circuit further comprises a circuit controller;
the loop controller is connected in series between the normally closed auxiliary contact of the line switch and the relay protection device and is used for controlling the protection loop to be put into or out of a use state.
4. A protection circuit for avoiding load on a thermopile generator alone as claimed in claim 3, wherein the circuit controller is configured as a knife switch.
5. The protection circuit for avoiding plant load on a thermopile generator alone according to claim 1 or 2, characterized in that the line switch comprises a first line switch and a second line switch forming a parallel circuit;
the protection circuit further comprises a normally closed auxiliary contact of the first line switch and a normally closed auxiliary contact of the second line switch which are connected in series.
6. The protection circuit for avoiding load on the thermopile generator alone according to claim 2, characterized in that it further comprises a delay;
the relay protection device is electrically connected with the relay protection device, so that when any one of the current relay, the line switch and the main transformer high-voltage side switch is in an off state, the normally-closed auxiliary contact is controlled to be in a delayed mode, and the relay protection device is controlled to disconnect the plant load from the auxiliary transformer.
7. The protection circuit for avoiding plant load on a thermopile generator alone according to claim 6, characterized in that it further comprises a fast cutting device;
the quick-cutting device is electrically connected with the relay protection device, so that after the relay protection device disconnects the plant load from the auxiliary transformer, the plant standby power supply is quickly controlled to be conducted with the plant load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320549959.5U CN219351272U (en) | 2023-03-21 | 2023-03-21 | Protection loop for avoiding load of high-temperature pile generator alone with factory |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320549959.5U CN219351272U (en) | 2023-03-21 | 2023-03-21 | Protection loop for avoiding load of high-temperature pile generator alone with factory |
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| Publication Number | Publication Date |
|---|---|
| CN219351272U true CN219351272U (en) | 2023-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320549959.5U Active CN219351272U (en) | 2023-03-21 | 2023-03-21 | Protection loop for avoiding load of high-temperature pile generator alone with factory |
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| CN (1) | CN219351272U (en) |
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- 2023-03-21 CN CN202320549959.5U patent/CN219351272U/en active Active
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