CN215681917U - Control loop for emergency bus of nuclear power station and power system - Google Patents
Control loop for emergency bus of nuclear power station and power system Download PDFInfo
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- CN215681917U CN215681917U CN202122008292.1U CN202122008292U CN215681917U CN 215681917 U CN215681917 U CN 215681917U CN 202122008292 U CN202122008292 U CN 202122008292U CN 215681917 U CN215681917 U CN 215681917U
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Abstract
The utility model discloses a control loop and a power system for an emergency bus of a nuclear power station, wherein the control loop comprises: a live wire and a zero wire; the voltage monitoring relay and the delay relay are arranged, and the delay time of the delay relay is longer than the one-way grounding reclosing time; the intermediate relay is provided with a third switch which is electrically connected with a normal power supply inlet switch; and when the third switch is closed, the normal power supply inlet wire switch is disconnected. When the external power grid fluctuates due to the fact that single-phase grounding reclosing occurs, the delay time of the delay relay is larger than the one-way grounding reclosing time, so that the delay relay can avoid the single-phase grounding reclosing time of the power grid, the incoming line voltage of the normal power end of the emergency bus is recovered to be normal along with the voltage of the external power grid before the intermediate relay acts, and therefore the situation that the incoming line switch of the normal power supply cannot trip to act and the emergency bus loses power is avoided.
Description
Technical Field
The utility model relates to the technical field of nuclear power stations, in particular to a control loop and a power system for an emergency bus of a nuclear power station.
Background
The emergency bus of the nuclear power station is an important station service electrical system of the nuclear power station, and the upstream of the emergency bus is connected with an emergency diesel generator as a standby power supply of the emergency diesel generator besides a normal power supply. Meanwhile, the emergency bus is required to be capable of realizing correct switching between the normal power supply and the emergency diesel generator standby power supply, namely, when the normal power supply is lost, the emergency diesel generator can be started quickly and supplies power to the emergency bus within the design time. The important ring in the switching logic is switching locking between the normal power supply incoming line switch and the emergency diesel generator standby incoming line switch, and the locking aims to avoid the situation that the normal power supply switch and the emergency diesel generator standby incoming line switch are simultaneously switched on. For example, at present, an emergency bus of a high-temperature gas cooled reactor nuclear island is designed with two power supplies, wherein one power supply is from an upstream 6kV normal power supply, the other power supply is from an emergency diesel generator, and the emergency diesel generator is used as a standby power supply. The two power supply incoming line switches are designed with locking logic, so that the condition that the two power supply switches are switched on simultaneously can be avoided.
In the prior art, in order to realize that the normal power supply is reduced to a certain degree or loses the back, the emergency diesel generator can supply power for the emergency bus within the design time, and the circuit is provided with the voltage-loss delay tripping control function. As shown in fig. 1, the voltage-loss delay trip control function is that when the voltage of the normal power supply is reduced to a certain degree or lost, the voltage monitoring relay KV1 operates (low voltage operation is set to 305V, time 2 s; phase-loss instantaneous operation), the first switch 11 of the voltage monitoring relay KV1 connected in series in the normal power supply voltage-loss interlocking signal loop is closed, the intermediate relay KA2 operates in a charged manner, the third switch 7 of the intermediate relay KA2 connected in series in the inlet switch trip loop is closed, the inlet switch trip loop is connected, and the normal power supply inlet switch trips.
However, when the external power grid fluctuates due to single-phase grounding reclosing, the normal power supply also fluctuates immediately, and there is a risk that the voltage of the normal power supply fluctuates to a value below the action voltage value of the voltage monitoring relay, and if the fluctuation time exceeds the delay fixed value, the emergency bus loses power due to the fluctuation of the external power grid.
SUMMERY OF THE UTILITY MODEL
Therefore, the technical problem to be solved by the utility model is that when an external power grid fluctuates, if the fluctuation time exceeds a delay fixed value, the emergency bus loses power due to the fluctuation of the external power grid, so that the control circuit and the power system for the emergency bus of the nuclear power station are provided.
In order to achieve the above object, an embodiment of the present invention provides a control loop for an emergency bus of a nuclear power plant, where the control loop includes: a live wire and a zero wire; the voltage monitoring relay is provided with a control end and a first switch, the control end is connected with an external power grid, the first end of the first switch is connected with a live wire of a wire inlet, and the second end of the first switch is connected with a zero wire of the wire inlet; the time delay relay is provided with a detection end and a second switch, the detection end is arranged between the second end of the first switch and the incoming line zero line, the first end of the second switch is connected with the incoming line live line, and the second end of the second switch is connected with the incoming line zero line through the control end of the intermediate relay; the delay time of the delay relay is longer than the one-way grounding reclosing time; the intermediate relay is provided with a third switch which is electrically connected with a normal power supply inlet switch; and when the third switch is closed, the normal power supply inlet wire switch is disconnected.
Optionally, the control loop further comprises: the incoming line voltage-loss brake-separating circuit and the third switch form a loop, and the incoming line voltage-loss brake-separating circuit is in communication connection with the normal power supply incoming line switch; when the third switch is closed, the inlet wire voltage-loss switching-off circuit is switched on, and the normal power supply inlet wire switch is switched off.
Optionally, when the unidirectional ground reclosing time is 0.8S, the delay time of the delay relay is 1.5S.
Optionally, the delay time of the voltage monitoring relay is 0.5 s.
Optionally, the external power grid is a three-phase power grid, the control end of the voltage monitoring relay is provided with three control ports, and the control ports are connected with each power transmission line in the three-phase power grid in a one-to-one correspondence manner.
Optionally, the control loop further comprises: and one end of the indicating lamp is connected with the second end of the second switch, and the other end of the indicating lamp is connected with the incoming line zero line.
Optionally, the operating voltage of the voltage monitoring relay is 28% to 35% of the normal voltage of the external grid.
An embodiment of the present invention further provides an electric power system, where the electric power system includes: the emergency bus is provided with a first power inlet end and a second power inlet end, the first power inlet end is connected with a normal power supply through a normal power supply inlet switch, and the second power inlet end is connected with an emergency standby power supply through an emergency standby inlet switch; according to any one of the embodiments, the control circuit for the normal power incoming line switch of the emergency bus of the nuclear power station is provided with the intermediate relay, the intermediate relay is provided with the third switch, when the third switch is closed, the normal power incoming line switch is disconnected, and the emergency standby incoming line switch is closed.
Optionally, the emergency backup power supply is an emergency diesel generator backup power supply.
Compared with the prior art, the technical scheme of the utility model has the following advantages:
1. the embodiment of the utility model provides a control loop of a normal power supply incoming line switch for an emergency bus of a nuclear power station, which comprises the following steps: a live wire and a zero wire; the voltage monitoring relay is provided with a control end and a first switch, the control end is connected with an external power grid, the first end of the first switch is connected with a live wire of a wire inlet, and the second end of the first switch is connected with a zero wire of the wire inlet; the time delay relay is provided with a detection end and a second switch, the detection end is arranged between the second end of the first switch and the incoming line zero line, the first end of the second switch is connected with the incoming line live line, and the second end of the second switch is connected with the incoming line zero line through the control end of the intermediate relay; the delay time of the delay relay is longer than the one-way grounding reclosing time; the intermediate relay is provided with a third switch which is electrically connected with a normal power supply inlet switch; and when the third switch is closed, the normal power supply inlet wire switch is disconnected.
According to the arrangement, when the external power grid generates single-phase grounding reclosure and leads to fluctuation of the external power grid, because the delay time of the delay relay is greater than the single-phase grounding reclosure time, the delay relay can avoid the single-phase grounding reclosure time of the power grid, namely when the power grid generates the power grid voltage fluctuation caused by the single-phase grounding reclosure, the voltage fluctuation of the emergency bus is fed back, the delay time of the delay relay is greater than the single-phase grounding reclosure time, the intermediate relay enables the inlet wire voltage of the normal power end of the emergency bus to be recovered to be normal along with the voltage of the external power grid before action, and the condition that the inlet wire switch of the normal power supply cannot trip to act and lead to power loss of the emergency bus is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for a worker of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of the overall structure of a control loop in the prior art.
Fig. 2 is a schematic diagram of the overall structure of a control loop according to an embodiment of the present invention.
Reference numerals:
KV1, voltage monitoring relay; KA2, an intermediate relay; KFT and a time delay relay;
l, leading in a live wire; l1, first line of fire; l2, second fire line; l3, third fire line; n1, an external power grid zero line; n, a wire inlet zero line;
1. a detection end; 2. an emergency bus; 3. a normal power supply incoming line switch; 4. a normal power supply; 5. an emergency standby incoming line switch; 6. an emergency standby power supply; 7. a third switch; 8. a second switch; 9. an external power grid; 10. an indicator light; 11. a first switch; 12. and the incoming line voltage-loss switching-off circuit.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a worker skilled in the art without creative efforts based on the embodiments of the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases by a worker of ordinary skill in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The emergency bus of the nuclear power station is an important station service electrical system of the nuclear power station, and the upstream of the emergency bus is connected with an emergency diesel generator as a standby power supply of the emergency diesel generator besides a normal power supply 4. Meanwhile, the emergency bus 2 is required to be capable of realizing correct switching between the normal power supply 4 and the emergency diesel generator standby power supply, namely when the normal power supply 4 is lost, the emergency diesel generator can be started quickly and supplies power to the emergency bus 2 within the design time. The important ring in the switching logic is the switching locking between the normal power supply incoming line switch 3 and the emergency diesel generator standby incoming line switch, and the locking aims to avoid the situation that the normal power supply 4 switch and the emergency diesel generator standby incoming line switch are simultaneously switched on. For example, an emergency bus 2 of a high-temperature gas cooled reactor nuclear island is designed with two power supplies, wherein one power supply is from an upstream 6kV normal power supply 4, the other power supply is from an emergency diesel generator, and the emergency diesel generator is used as a standby power supply. The two power supply incoming line switches are designed with locking logic, so that the condition that the two power supply switches are switched on simultaneously can be avoided.
In the prior art, in order to realize that the normal power supply 4 is reduced to a certain degree or loses the back, the emergency diesel generator can supply power for the emergency bus 2 within the design time, and the circuit is provided with a voltage-loss delay tripping control function. As shown in fig. 1, the voltage-loss delay trip control function is that when the voltage of the normal power supply 4 is reduced to a certain degree or lost, the voltage monitoring relay KV1 operates (low voltage operation is set to 305V, time 2 s; phase-loss instantaneous operation), the first switch 11 of the voltage monitoring relay KV1 connected in series in the normal power supply voltage-loss interlocking signal loop is closed, the intermediate relay KA2 operates with electricity, the third switch 7 of the intermediate relay KA2 connected in series in the inlet switch trip loop is closed, the inlet switch trip loop is connected, and the normal power supply inlet switch 3 is tripped. However, when the external power grid 9 fluctuates due to the single-phase earth reclosing of the external power grid 9, the normal power supply 4 also fluctuates immediately, and there is a risk that the voltage of the normal power supply 4 fluctuates to a value below the action voltage of the voltage monitoring relay KV1, and if the fluctuation time exceeds the delay fixed value, the emergency bus 2 loses power due to the fluctuation of the external power grid 9.
Therefore, the technical problem to be solved by the utility model is that when the external power grid 9 fluctuates, if the fluctuation time exceeds the delay fixed value, the emergency bus 2 loses power due to the fluctuation of the external power grid 9, so that the control loop for the emergency bus of the nuclear power station is provided.
Example 1
As shown in fig. 2, an embodiment of the present invention provides a control loop for an emergency bus of a nuclear power plant, where the control loop includes a live line L, a neutral line N, a voltage monitoring relay KV1, a time delay relay KFT, and an intermediate relay KA 2.
Specifically, in the embodiment of the present invention, the voltage monitor relay KV1 is connected in series in the normal power supply no-voltage interlock signal loop, the voltage monitor relay KV1 is provided with a control end and a first switch 11, the control end is connected with the external power grid 9, a first end of the first switch 11 is connected with the incoming live line L, and a second end of the first switch 11 is connected with the incoming zero line N, so that the first switch 11 is connected in series in the incoming loop of the normal power supply 4.
Delay relay KFT is provided with sense terminal 1 and second switch 8, sense terminal 1 sets up first switch 11 the second end with between the inlet wire zero line N, second switch 8 the first end with inlet wire live wire L connects, second switch 8 the second end through auxiliary relay KA2 the control end with inlet wire zero line N connects. In addition, in the embodiment of the present invention, the delay time of the delay relay KFT needs to be set to be greater than the unidirectional ground reclosing time.
The intermediate relay KA2 is further provided with a third switch 7, and the third switch 7 is electrically connected with the normal power inlet switch 3. And, when the third switch 7 is closed, the normal power incoming switch 3 is opened. For example, in normal operation, the normal power inlet switch 3 is in a closed state, i.e. the emergency bus is powered by the normal power supply. The voltage relay KV1 is in a pull-in state, namely the first switch 11 of the voltage relay KV1 is switched off, and the time delay relay KFT is in a power-off state. When the normal power loses power, the voltage relay KV1 is released, namely the first switch 11 of the voltage relay KV1 is closed, the time delay relay KFT is electrified, the second switch 8 of the time delay relay KFT is closed after time delay, and the intermediate relay KA2 is electrified to act, so that the third switch 7 of the intermediate relay KA2 is closed, the incoming line voltage-losing brake-separating loop 12 of the normal power is conducted, and the normal power incoming line switch 3 is switched off. Of course, the embodiment of the present invention is only to illustrate the type of the normal power line incoming switch 3, but the type of the normal line incoming switch is not limited, and a person skilled in the art can change the type of the normal line incoming switch according to actual conditions, so as to achieve the same technical effect.
So set up, when normal power 4 is out of voltage, voltage monitoring relay KV1 moves at first, voltage monitoring relay KV 1's first switch 11 is closed, then delay relay KFT moves, after the delay time of delay relay KFT self, delay relay KFT's second switch 8 is closed, intermediate relay KA2 moves at last, the third switch 7 of intermediate relay KA2 who concatenates in inlet wire voltage-loss separating brake circuit 12 is closed, normal power inlet wire switch 3 disconnection. The closing of the emergency standby incoming line switch 5 can be controlled by a DCS switch cabinet of a main control room or a diesel standby power supply on site. When the external power grid 9 takes place single-phase ground reclosing and leads to external power grid 9 undulant, because delay relay KFT's delay time is greater than one-way ground reclosing time, make delay relay KFT can avoid the single-phase ground reclosing time of electric wire netting, when the electric wire netting voltage that single-phase ground reclosing leads to takes place promptly fluctuates, the voltage fluctuation of feeding back emergency bus 2, delay time because of delay relay KFT is greater than one-way ground reclosing time, make intermediate relay KA2 before the action, the inlet wire voltage of emergency bus 2's normal power 4 end follows external power grid 9 voltage and resumes normally, thereby avoided normal power inlet wire switch 3 can not the tripping action, lead to the condition of emergency bus 2 losing power.
Furthermore, the control loop may further include an incoming line no-voltage tripping circuit 12, and the third switch 7 and the series incoming line no-voltage tripping circuit 12 are connected in series, so that the third switch 7 and the series incoming line no-voltage tripping circuit 12 form a loop. And the incoming line voltage-loss switching-off circuit 12 is in communication connection with the normal power supply incoming line switch 3. When the third switch 7 is closed, the incoming line voltage-loss switching-off circuit 12 is switched on, and the normal power incoming line switch 3 is switched off.
For example, when the normal power inlet switch 3 is in a closed state during normal operation, the opening electromagnet of the normal inlet switch 3 is connected in series in the inlet no-voltage opening circuit 12, and when the inlet no-voltage opening circuit 12 is in an open state, the opening electromagnet cannot be electrified, so that the normal power inlet switch 3 is in a closed state; when the inlet wire voltage-loss switching-off circuit 12 is in a closed state, the switching-off electromagnet is electrified, so that the normal inlet wire switch 3 is in an open state.
In the embodiment of the present invention, since the unidirectional ground reclosing time is generally about 0.8S, when the unidirectional ground reclosing time is 0.8S, the delay time of the delay relay KFT may be set to 1.5S. When the external power grid 9 takes place single-phase ground reclosing and leads to external power grid 9 undulant, because delay relay KFT's delay time is greater than one-way ground reclosing time, make delay relay KFT can avoid the single-phase ground reclosing time of electric wire netting, when the electric wire netting voltage that single-phase ground reclosing leads to takes place promptly fluctuates, the voltage fluctuation of feeding back emergency bus 2, delay time because of delay relay KFT is greater than one-way ground reclosing time, make intermediate relay KA2 before the action, the inlet wire voltage of emergency bus 2's normal power 4 end follows external power grid 9 voltage and resumes normally, thereby avoided normal power inlet wire switch 3 can not the tripping action, lead to the condition of emergency bus 2 losing power.
Further, the delay time of the voltage monitor relay KV1 may be set to 0.5 s. Therefore, the longest delay of the voltage monitoring relay KV1 and the delay relay KFT is 2s (0.5s +1.5s), the shortest delay is 1.5s, and the single-phase grounding reclosing time of the power grid can be avoided.
Optionally, in the embodiment of the present invention, the external power grid 9 may be a three-phase power, and includes an external power grid neutral line N1, a first live line L1, a second live line L2, and a third live line L3. The control end of the voltage monitoring relay KV1 is provided with three control ports, and the control ports are connected with a first live wire L1, a second live wire L2 and a third live wire L3 in the three-phase power in a one-to-one correspondence mode.
In an optional embodiment of the present invention, the control circuit may further include an indicator light 10, one end of the indicator light 10 is connected to the second end of the second switch 8, and the other end of the indicator light 10 is connected to the incoming neutral wire N. The indicator light 10 is used to indicate whether the intermediate relay KA2 has been energized and trips the normal power inlet switch 3. When the indicator lamp 10 is lighted, the intermediate relay KA2 is powered on, and the normal power inlet switch 3 performs a tripping action; when the indicator light 10 is not lighted, it means that the intermediate relay KA2 is not energized, and the normal power inlet switch 3 does not perform the trip action,
further, in the embodiment of the present invention, the operating voltage of the voltage monitor relay KV1 may be set to 28% to 35% of the normal voltage of the external power grid 9.
Of course, the embodiment of the present invention is merely an example of the operating voltage of voltage monitoring relay KV1, but the present invention is not limited thereto, and those skilled in the art can change the operating voltage of voltage monitoring relay KV1 according to actual conditions, and can achieve the same technical effects.
Example 2
An embodiment of the present invention further provides an electric power system, where the electric power system includes: emergency bus 2, normal power supply 4, emergency backup power supply 6 and a control loop for a nuclear power plant emergency bus as described in any of the above embodiments.
Specifically, in the embodiment of the present invention, the emergency bus 2 is provided with a first power inlet end and a second power inlet end, the first power inlet end is connected to the normal power supply 4 through the normal power supply inlet switch 3, and the second power inlet end is connected to the emergency standby power supply 6 through the emergency standby inlet switch 5. When the third switch 7 of the control loop is closed, the normal power supply incoming line switch 3 is switched off, and the emergency standby incoming line switch 5 is closed. For example, the normal power incoming line switch 3 is in a closed state, the opening electromagnet is connected in series in a circuit where the third switch 7 is located, when the third switch 7 is opened to make the voltage-loss opening circuit in an open state, the opening electromagnet cannot be powered on, so that the normal incoming line switch 3 is in a closed state, and the emergency standby incoming line switch 5 is in an open state due to the locking logic in the prior art; when the third switch 7 is closed to enable the circuit to be in a closed state, the opening electromagnet is electrified, so that the normal incoming line switch is in an open state, and the closing of the emergency standby incoming line switch 5 can be controlled by a DCS (distributed control system) switch cabinet or a diesel standby power supply in a main control room.
So set up, when single-phase ground connection reclosing lock leads to outer power grid 9 undulant when taking place for outer power grid 9, because delay relay KFT's delay time is greater than one-way ground connection reclosing lock time, make delay relay KFT can avoid the single-phase ground connection reclosing lock time of electric wire netting, when the electric wire netting voltage that single-phase ground connection reclosing lock leads to fluctuates promptly when the electric wire netting takes place, the voltage fluctuation of feeding back emergency bus 2, delay time because of delay relay KFT is greater than one-way ground connection reclosing lock time, make intermediate relay KA2 before the action, the inlet wire voltage of emergency bus 2's normal power 4 ends follows outer power grid 9 voltage and resumes normally, thereby avoided normal power service inlet wire switch 3 can not the tripping action, lead to the condition that emergency bus 2 loses electricity.
Optionally, in the embodiment of the present invention, the emergency backup power source 6 may be an emergency diesel generator backup power source. Of course, the embodiment of the present invention is only to illustrate the type of the emergency backup power supply 6, but the present invention is not limited thereto, and a person skilled in the art may change the type of the emergency backup power supply 6 according to actual situations, and may achieve the same technical effect.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Variations and modifications in other variations may occur to those skilled in the art based upon the foregoing description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.
Claims (9)
1. A control circuit for a nuclear power plant emergency bus, comprising:
a live wire (L) and a zero wire (N);
the voltage monitoring relay (KV1) is provided with a control end and a first switch (11), the control end is connected with an external power grid (9), the first end of the first switch (11) is connected with the incoming live wire (L), and the second end of the first switch (11) is connected with the incoming zero wire (N);
the time delay relay (KFT) is provided with a detection end (1) and a second switch (8), the detection end (1) is arranged between the second end of the first switch (11) and the wire-incoming zero line (N), the first end of the second switch (8) is connected with the wire-incoming live line (L), and the second end of the second switch (8) is connected with the wire-incoming zero line (N) through the control end of an intermediate relay (KA 2); the delay time of the delay relay (KFT) is longer than the one-way grounding reclosing time;
the intermediate relay (KA2) is provided with a third switch (7), and the third switch (7) is electrically connected with the normal power inlet switch (3); when the third switch (7) is closed, the normal power inlet switch (3) is disconnected.
2. The control circuit of claim 1, further comprising:
the incoming line voltage-loss brake-separating circuit (12) and the third switch (7) form a loop, and the incoming line voltage-loss brake-separating circuit (12) is in communication connection with the normal power supply incoming line switch (3); when the third switch (7) is closed, the incoming line voltage-loss switching-off circuit (12) is switched on, and the normal power incoming line switch (3) is switched off.
3. The control circuit according to claim 2, characterized in that the delay time of the delay relay (KFT) is 1.5S when the unidirectional ground reclosing time is 0.8S.
4. A control loop according to claim 3, characterized in that the delay time of the voltage monitoring relay (KV1) is 0.5 s.
5. The control circuit according to any one of claims 1 to 4, characterized in that the external network (9) is a three-phase power supply, and the control terminal of the voltage monitoring relay (KV1) is provided with three control ports, which are connected in one-to-one correspondence with each transmission line of the three-phase power supply.
6. The control circuit according to any one of claims 1 to 4, further comprising:
the indicating lamp (10), the one end of indicating lamp (10) with the second end of second switch (8) is connected, the other end of indicating lamp (10) with inlet wire zero line (N) are connected.
7. Control circuit according to any of claims 1 to 4, characterized in that the actuation voltage of the voltage monitoring relay (KV1) is 28% to 35% of the normal voltage of the external network (9).
8. An electrical power system, comprising:
the emergency bus (2) is provided with a first power inlet end and a second power inlet end, the first power inlet end is connected with a normal power supply (4) through a normal power supply inlet switch (3), and the second power inlet end is connected with an emergency standby power supply (6) through an emergency standby inlet switch (5);
the control circuit for the emergency bus of a nuclear power plant as claimed in any one of claims 1 to 6, wherein the intermediate relay (KA2) is arranged in the control circuit, the intermediate relay (KA2) is provided with a third switch (7), and when the third switch (7) is closed, the normal power inlet switch (3) is opened.
9. The power system according to claim 8, characterized in that the emergency backup power source (6) is an emergency diesel generator backup power source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122008292.1U CN215681917U (en) | 2021-08-24 | 2021-08-24 | Control loop for emergency bus of nuclear power station and power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122008292.1U CN215681917U (en) | 2021-08-24 | 2021-08-24 | Control loop for emergency bus of nuclear power station and power system |
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| Publication Number | Publication Date |
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| CN215681917U true CN215681917U (en) | 2022-01-28 |
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| CN202122008292.1U Active CN215681917U (en) | 2021-08-24 | 2021-08-24 | Control loop for emergency bus of nuclear power station and power system |
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