Flood-proof factory alarm and emergency shutdown system

Abstract

This utility model discloses a flood-resistant power plant alarm and emergency shutdown system, including an emergency drainage pump installed in the maintenance pump house, an emergency drainage pump installed in the generator pit, and a hydro-generator unit installed on the generator unit and equipment platform. The system also includes a pump house water level monitoring device, a common equipment control unit, a generator pit water level monitoring device, and a generator unit control unit. The pump house water level monitoring device, installed in the maintenance pump house, and the emergency drainage pump are electrically connected to the common equipment control unit to detect the water level in the pump house and send the detection signal to the common equipment control unit. This utility model equips both the maintenance pump house and the generator pit with water level monitoring devices and connects the emergency drainage pumps in the pump house and generator pit to the control unit, achieving the purpose of activating alarm signals, starting emergency drainage pumps, and triggering emergency shutdown when the water level is high or excessively high, thus ensuring the safe operation of the power plant's equipment.

Description

Technical Field

[0001] This utility model relates to a system, specifically a flood-proof factory alarm and emergency shutdown system. Background Technology

[0002] The maintenance pump house (high-rise) and generator pit (low-rise) of a hydropower plant are usually located on the lowest level of the plant, where water often accumulates when leaks occur in the plant or the turbine generator units. The hydropower plant where the inventor works has emergency drainage pumps installed in both the maintenance pump house and the generator pit to remove accumulated water. However, neither the pump house nor the pit is equipped with water level monitoring devices or automatic control devices for the emergency drainage pumps. Therefore, it is impossible to detect water accumulation in the pump house and pit in a timely manner, and automatic alarms and pumping cannot be implemented. By the time water is detected, it may have flooded the electrical equipment in the pump house or the operating units, seriously threatening the safe operation of the power plant's equipment. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a flood-proof plant alarm and emergency shutdown system. Water level monitoring devices are installed in both the maintenance pump room and the unit pit, and the emergency drainage pumps in the pump room and the pit are connected to the control unit. When the water level is high or too high, the system can activate the alarm signal, start the emergency drainage pump, and shut down the unit in an emergency, thereby ensuring the safe operation of the power plant unit equipment.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A flood-resistant plant alarm and emergency shutdown system includes an emergency drainage pump in the maintenance pump room, an emergency drainage pump in the generator pit, and a turbine-generator unit installed on the generator unit and equipment platform. The system is characterized by further comprising a pump room water level monitoring device, a utility equipment control unit, a generator pit water level monitoring device, and a generator unit control unit. The pump room water level monitoring device, located in the maintenance pump room, and the emergency drainage pump are electrically connected to the utility equipment control unit. It detects the water level in the pump room and sends the detection signal to the utility equipment control unit, which controls the start / stop of the emergency drainage pump and issues an alarm based on the water level value. The generator pit water level monitoring device, located in the generator pit, and the emergency drainage pump are electrically connected to the generator unit control unit. It detects the water level in the pit and sends the detection signal to the generator unit control unit, which controls the start / stop of the emergency drainage pump and the turbine-generator unit and issues an alarm based on the water level value.

[0006] Furthermore, the pump room water level monitoring device includes a first float-type water level gauge, a first capacitive water level gauge, and a first submersible water level sensor.

[0007] Furthermore, the public equipment control unit includes a first PLC controller, a first control button, a first touch screen, and a first alarm module; the first PLC controller is electrically connected to the emergency drainage pump of the pump room, the first float-type water level gauge, the first capacitive water level gauge, the first submersible water level sensor, the first control button, the first touch screen, and the first alarm module, respectively.

[0008] Furthermore, a first relay and a first status indicator light are connected between the first PLC controller and the emergency drainage pump in the pump room.

[0009] Furthermore, the first alarm module includes multiple first signal indicator lights electrically connected to the PLC controller, and each first signal indicator light is connected to the first PLC controller by a second relay.

[0010] Furthermore, the pit water level monitoring device includes a second float-type water level gauge, a second capacitive water level gauge, and a second submersible water level sensor, wherein the second submersible water level sensor is installed in the unit pit, and the second float-type water level gauge and the second capacitive water level gauge are installed on the unit and equipment platform.

[0011] Furthermore, the unit control unit includes a second PLC controller, a second control button, a second touch screen, and a second alarm module; the second PLC controller is electrically connected to the pit emergency drainage pump, the turbine generator set, the second float-type water level gauge, the second capacitive water level gauge, the second submersible water level sensor, the second control button, the second touch screen, and the second alarm module, respectively.

[0012] Furthermore, a third relay and a second status indicator are connected between the second PLC controller and the emergency drainage pump in the sump, and a fourth relay is connected between the second PLC controller and the turbine generator set.

[0013] Furthermore, the second alarm module includes multiple second signal indicator lights electrically connected to the second PLC controller, and each of the multiple second signal indicator lights is connected to the second PLC controller by a fifth relay and a sixth relay.

[0014] Furthermore, the system also includes a first power supply module and a second power supply module. The first power supply module includes a 220V AC mains power supply and a first switching power supply. The second power supply module includes a 220V AC mains power supply and a second switching power supply. The L and N terminals of the input terminals of the first and second switching power supplies are electrically connected to the L and N terminals of the 220V AC mains power supply, respectively. The output terminals of the first and second switching power supplies can output 24V DC voltage and 5V DC voltage, respectively.

[0015] The beneficial effects of this utility model are:

[0016] The flood-proof power plant alarm and emergency shutdown system provided by this utility model includes pump room water level monitoring devices and generator pit water level monitoring devices installed in the maintenance pump room and generator pit respectively. The pump room emergency drainage pump and pump room water level monitoring devices are connected to the common equipment control unit. The generator pit emergency drainage pump, generator pit water level monitoring device, and turbine generator set are connected to the unit control unit. When the water level detected by the pump room water level monitoring devices and generator pit water level monitoring devices is high, the common equipment control unit and the unit control unit respectively control the pump room emergency drainage pump and generator pit emergency drainage pump to operate, thereby pumping out the accumulated water in the pump room and generator pit, and issuing corresponding alarm signals. When the water level detected by the generator pit water level monitoring device is too high, the unit control unit controls the generator pit emergency drainage pump to operate and simultaneously controls the turbine generator set to stop operating, issuing corresponding alarm signals. This achieves the purpose of activating alarm signals, starting emergency drainage pumps, and emergency shutdown when the water level is high or too high, ensuring the safe operation of the power plant's equipment. Attached Figure Description

[0017] Figure 1 This is a system block diagram of an embodiment of the present utility model.

[0018] Figure 2 This is a circuit diagram of the first power supply module according to an embodiment of the present invention.

[0019] Figure 3 This is a circuit diagram of the first PLC controller and its connection with the first touch screen according to an embodiment of the present invention.

[0020] Figure 4 This is a circuit diagram of the first float-type water level gauge, the first capacitive water level gauge, and the first submersible water level sensor according to an embodiment of this utility model.

[0021] Figure 5 This is a circuit diagram of the emergency drainage pump, the first relay, and the first status indicator light in an embodiment of this utility model.

[0022] Figure 6 This is a circuit diagram of the first signal indicator and the second relay according to an embodiment of the present invention.

[0023] Figure 7 This is a circuit diagram of the first control button in an embodiment of the present invention.

[0024] Figure 8 This is a circuit diagram of the second power supply module according to an embodiment of the present invention.

[0025] Figure 9 This is a circuit diagram of the second PLC controller and its connection with the second touch screen according to an embodiment of the present invention.

[0026] Figure 10This is a circuit diagram of the second float-type water level gauge, the second capacitive water level gauge, and the second submersible water level sensor according to an embodiment of this utility model.

[0027] Figure 11 This is a circuit diagram of the emergency drainage pump for the machine pit, the third relay, and the second status indicator light according to an embodiment of this utility model.

[0028] Figure 12 This is a circuit diagram of the hydro-generator set and the fourth relay according to an embodiment of the present invention.

[0029] Figure 13 This is a circuit diagram of the second signal indicator, the fifth relay, and the sixth relay in an embodiment of this utility model.

[0030] Figure 14 This is a circuit diagram of the second control button in an embodiment of the present invention. Detailed Implementation

[0031] The present invention will now be described in conjunction with the accompanying drawings. The specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention. Various modifications and improvements to the technical solutions of the present invention made by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope of the present invention.

[0032] like Figures 1 to 14 As shown, the flood-proof factory alarm and emergency shutdown system of this embodiment includes a system installed in the maintenance pump room ( Figure 1 The emergency drainage pump in the pump room (93 stories high) is located in the unit pit. Figure 1 The emergency drainage pump in the pit (92 stories) and the pump installed on the unit and equipment platform ( Figure 1 The middle section is a 94-story hydroelectric generator unit.

[0033] In addition, the system also includes a pump room water level monitoring device, a utility equipment control unit, a pit water level monitoring device, and a unit control unit.

[0034] The pump room water level monitoring device is installed in the maintenance pump room. It and the emergency drainage pump are electrically connected to the public equipment control unit. It is used to detect the water level in the pump room and send the detection signal to the public equipment control unit. The public equipment control unit is used to control the start and stop of the emergency drainage pump and issue an alarm according to the water level value.

[0035] The pit water level monitoring device is installed in the unit pit. It and the pit emergency drainage pump are electrically connected to the unit control unit. It is used to detect the water level in the pit and send the detection signal to the unit control unit. The unit control unit is used to control the start and stop of the pit emergency drainage pump and the turbine generator set and to issue an alarm based on the water level value.

[0036] The pump room water level monitoring device in this embodiment includes a first float-type water level gauge, a first capacitive water level gauge, and a first submersible water level sensor, all installed in the maintenance pump room. The public equipment control unit includes a first PLC controller, a first control button, a first touch screen, and a first alarm module. The first PLC controller is electrically connected to the emergency drainage pump, the first float-type water level gauge, the first capacitive water level gauge, the first submersible water level sensor, the first control button, the first touch screen, and the first alarm module.

[0037] like Figure 2 As shown, the system in this embodiment also includes a first power supply module, which includes a 220V AC mains power supply and a first switching power supply (represented by PS1 in the circuit). The L and N terminals of the input terminal of the first switching power supply are electrically connected to the L and N terminals of the 220V AC mains power supply, respectively. The output terminal of the first switching power supply can output a 24V DC voltage and a 5V DC voltage. The first power supply module also includes a rocker switch and a fuse FU00.

[0038] In the circuit, the first float-type water level gauge, the first capacitive water level gauge, and the first submersible water level sensor are represented by J1, J2, and J3, respectively. The first PLC controller is represented by PLC1. The signal output terminals of the first float-type water level gauge and the first capacitive water level gauge are respectively connected to the switch signal input terminal of the first PLC controller. The signal output terminal of the first submersible water level sensor is connected to the analog signal input terminal of the first PLC controller. After receiving the detection signals from the first float-type water level gauge, the first capacitive water level gauge, and the first submersible water level sensor, the first PLC controller converts the detection signals into the water level value of the maintenance pump room.

[0039] The emergency drainage pump in the pumping station is represented by M1 in the circuit. A first relay and a first status indicator are connected between the first PLC controller and the emergency drainage pump. The first relay is represented by KA1 in the circuit. There are two first status indicators, represented by LD1 and LD2 in the circuit. The first status indicator LD1 is used to indicate that the emergency drainage pump is working, and the first status indicator LD2 is used to indicate that the emergency drainage pump is not working.

[0040] The specific circuit connection is as follows: the positive terminal of the coil of the first relay KA1 is electrically connected to the signal output terminal of the first PLC controller, and the negative terminal of the coil is electrically connected to the GND terminal. The first normally open terminal of the first relay KA1 is connected in series with the first status indicator LD1 and then electrically connected to the 220V AC L terminal of the first power module. The first normally closed terminal of the first relay KA1 is connected in series with the first status indicator LD2 and then electrically connected to the 220V AC L terminal of the first power module. The first common terminal of the first relay KA1 is connected to the 220V AC N terminal of the first power module. The second normally open terminal of the first relay KA1 is connected to the 220V AC L terminal of the first power module. The second common terminal of the first relay KA1 is connected in series with the emergency drainage pump of the pump room and then electrically connected to the 220V AC N terminal of the first power module.

[0041] The first PLC controller is equipped with a water level threshold. When the water level values ​​detected by any two of the first float-type water level gauge, the first capacitive water level gauge, and the first submersible water level sensor exceed the set water level threshold ("two out of three" logic judgment), the signal output terminal of the first PLC controller outputs a signal to the positive terminal of the coil of the first relay KA1, causing the coil of the first relay KA1 to conduct, and causing its first normally open terminal to close, its first normally closed terminal to open, its second normally open terminal to close, and its second normally closed terminal to open. At this time, the first status indicator light LD1 conducts and lights up, and the emergency drainage pump in the pump room conducts and starts pumping water. When the water level values ​​detected by any two of the first float-type water level gauge, the first capacitive water level gauge, and the first submersible water level sensor do not exceed the set water level threshold ("two out of three" logic judgment), the signal output terminal of the first PLC controller does not output a signal to the positive terminal of the coil of the first relay KA1. The coil of the first relay KA1 is not conductive, and the first normally open terminal of the first relay KA1 is open, the first normally closed terminal is closed, the second normally open terminal is open, and the second normally closed terminal is closed. At this time, the first status indicator light LD2 is conductive and illuminates, and the emergency drainage pump in the pumping station is not conductive and stops pumping. The first relay KA1 is also connected in parallel with a local manual control switch K1 for manually controlling the operation of the emergency drainage pump in the pumping station on site.

[0042] In this embodiment, the first control button is represented by button KD11 in the circuit. It is used to remotely and manually control the operation of the emergency drainage pump in the pump room. That is, when the first control button is pressed, the first PLC controller outputs a signal to the positive terminal of the coil of the first relay. When the first control button is pressed again, the first PLC controller does not output a signal to the positive terminal of the coil of the first relay.

[0043] The first touch screen is connected to the first PLC controller via an RJ45 interface. The first touch screen can send instructions to the first PLC controller and can also display the values ​​detected by the first float-type water level gauge, the first capacitive water level gauge, and the first submersible water level sensor.

[0044] The first alarm module in this embodiment includes multiple first signal indicator lights electrically connected to the PLC controller. A second relay is provided between each of the first signal indicator lights and the first PLC controller. In this embodiment, there are two first signal indicator lights, which are represented by LD5 and LD6 in the circuit. The second relay is represented by KA2 in the circuit. The specific circuit connection is as follows: the positive terminal of the coil of the second relay is electrically connected to the signal output terminal of the first PLC controller, and the negative terminal of the coil is electrically connected to the GND terminal. The normally open terminal of the second relay is connected in series with the first signal indicator light LD5 and then electrically connected to the 5V voltage output terminal of the first switching power supply. The normally closed terminal is connected in series with the first signal indicator light LD6 and then electrically connected to the 5V voltage output terminal of the first switching power supply. The common terminal is electrically connected to the GND terminal. When any two of the first float-type water level gauge, first capacitive water level gauge, and first submersible water level sensor detect water level values ​​exceeding the set water level threshold ("two out of three" logic judgment), the signal output terminal of the first PLC controller outputs a signal to the positive terminal of the coil of the second relay KA2. The normally open terminal of the second relay KA2 closes, the normally closed terminal opens, and the first signal indicator LD5 conducts and illuminates, indicating that the water level in the maintenance pump room is high (exceeding the set range). When any two of the first float-type water level gauge, first capacitive water level gauge, and first submersible water level sensor detect water level values ​​not exceeding the set water level threshold ("two out of three" logic judgment), the signal output terminal of the first PLC controller does not output a signal to the positive terminal of the coil of the second relay KA2. The normally open terminal of the second relay opens, the normally closed terminal closes, and the first signal indicator LD6 conducts and illuminates, indicating that the water level in the maintenance pump room is within the set range.

[0045] The pit water level monitoring device in this embodiment includes a second float-type water level gauge, a second capacitive water level gauge, and a second submersible water level sensor. The second submersible water level sensor is installed in the unit's pit to detect the water level in the pit. The second float-type water level gauge and the second capacitive water level gauge are installed on the unit and equipment platform to detect the water level on the unit and equipment platform. The unit control unit in this embodiment includes a second PLC controller, a second control button, a second touchscreen, and a second alarm module. The second PLC controller is electrically connected to the pit emergency drainage pump, the turbine generator set, the second float-type water level gauge, the second capacitive water level gauge, the second submersible water level sensor, the second control button, the second touchscreen, and the second alarm module.

[0046] like Figure 8As shown, the system in this embodiment also includes a second power supply module, which includes a 220V AC mains power supply and a second switching power supply (represented by PS2 in the circuit). The L and N terminals of the input terminal of the second switching power supply are electrically connected to the L and N terminals of the 220V AC mains power supply, respectively. The output terminal of the second switching power supply can output a 24V DC voltage and a 5V DC voltage. The second power supply module also includes a rocker switch and a fuse FU01.

[0047] In the circuit, the second float-type water level gauge, the second capacitive water level gauge, and the second submersible water level sensor are represented by J4, J5, and J6, respectively. The second PLC controller is represented by PLC2. The signal output terminals of the second float-type water level gauge and the second capacitive water level gauge are respectively connected to the switch signal input terminal of the second PLC controller. The signal output terminal of the second submersible water level sensor is connected to the analog signal input terminal of the second PLC controller. After receiving the detection signals from the second float-type water level gauge, the second capacitive water level gauge, and the second submersible water level sensor, the second PLC controller converts the detection signals into water level values ​​for the unit, equipment platform, and pit, respectively.

[0048] A third relay and a second status indicator are connected between the second PLC controller and the pit emergency drainage pump. The pit emergency drainage pump is represented by M2 in the circuit, the third relay is represented by KA3 in the circuit, and there are two first status indicator lights, represented by LD3 and LD4 in the circuit. The second status indicator light LD3 is used to indicate that the pit emergency drainage pump is working, and the first status indicator light LD4 is used to indicate that the pit emergency drainage pump has stopped working.

[0049] The specific circuit connection is as follows: the positive terminal of the coil of the third relay KA3 is electrically connected to the signal output terminal of the second PLC controller, and the negative terminal of the coil is electrically connected to the GND terminal. The second normally open terminal of the third relay KA3 is connected in series with the second status indicator LD3 and then electrically connected to the 220V AC L terminal of the second power module. The first normally closed terminal of the third relay KA3 is connected in series with the second status indicator LD3 and then electrically connected to the 220V AC L terminal of the second power module. The first common terminal of the third relay KA3 is connected to the 220V AC N terminal of the second power module. The second normally open terminal of the third relay KA3 is connected in series with the 220V AC L terminal of the second power module. The second common terminal of the third relay KA3 is connected in series with the emergency drainage pump of the pit and then electrically connected to the 220V AC N terminal of the second power module.

[0050] The second PLC controller has a water level threshold. When the water level values ​​detected by the second submersible water level sensor all exceed the set threshold, the signal output terminal of the second PLC controller outputs a signal to the positive terminal of the coil of the third relay KA3, causing the coil of the third relay KA3 to conduct, closing its first normally open terminal, opening its first normally closed terminal, closing its second normally open terminal, and opening its second normally closed terminal. At this time, the second status indicator LD3 conducts and illuminates, and the emergency drainage pump of the pit conducts and begins pumping water. When the water level values ​​detected by the second submersible water level sensor do not exceed the set threshold, the signal output terminal of the second PLC controller does not output a signal to the positive terminal of the coil of the third relay KA3, the coil of the third relay KA3 does not conduct, and the first normally open terminal of the third relay KA3 opens, closes its first normally closed terminal, opens its second normally open terminal, and closes its second normally closed terminal. At this time, the second status indicator LD4 conducts and illuminates, and the emergency drainage pump of the pit stops pumping water. The third relay KA3 is also connected in parallel with a local manual control switch K2 for manually controlling the operation of the emergency drainage pump of the pit on site.

[0051] A fourth relay is connected between the second PLC controller and the hydro-generator set. There are multiple fourth relays, which are represented by KA4, KA5...KAn in the circuit. The positive terminals of the coils of the multiple fourth relays are all electrically connected to the signal output terminals of the second PLC controller, the common terminal is electrically connected to the GND terminal, the normally open terminal is connected to the 220V AC power L terminal of the second power module, the common terminal is electrically connected to the power supply L terminal of the hydro-generator set, and the power supply N terminal of the hydro-generator set is connected to the 220V AC power N terminal of the second power module.

[0052] When the water level values ​​detected by the second submersible water level sensor all exceed the set water level threshold, and the water level detected by at least one of the second float-type water level gauge and the second capacitive water level gauge exceeds the set water level threshold, the output terminal of the second PLC controller outputs a signal to the positive terminal of the coil of the third relay, but does not output a signal to the positive terminals of the coils of all the fourth relays. This causes the second PLC controller to control the emergency drainage pump of the sump to work while simultaneously controlling the turbine generator set to stop working. When only the water level values ​​detected by the second submersible water level sensor all exceed the set water level threshold, the second PLC controller controls the emergency drainage pump of the sump to work while simultaneously controlling the turbine generator set to work. When the water level values ​​detected by the second float-type water level gauge, the second capacitive water level gauge, and the second submersible water level sensor do not exceed the set water level threshold, the second PLC controller controls the emergency drainage pump of the sump to stop working while simultaneously controlling the turbine generator set to work. In this embodiment, the first, third, and fourth relays are all equipped with fuses, denoted as FU1, FU2, ..., Fun.

[0053] This embodiment has multiple second control buttons, used for remote manual control of the emergency drainage pump in the sump and the turbine generator set. The second control button for controlling the emergency drainage pump is denoted as KD21, and the second control buttons for controlling the turbine generator set are denoted as KD22, KD23, ..., KD2n. By opening and closing the second control buttons, the second PLC controller controls the opening and closing of the third and fourth relays, thereby achieving the purpose of remote manual control of the emergency drainage pump and the turbine generator set.

[0054] The second touchscreen is connected to the second PLC controller via an RJ45 interface. The second touchscreen can send commands to the second PLC controller and can also display the values ​​detected by the second float-type water level gauge, the second capacitive water level gauge, and the second submersible water level sensor.

[0055] The second alarm module in this embodiment includes multiple second signal indicator lights electrically connected to the second PLC controller. Each of these second signal indicator lights is connected to a fifth relay and a sixth relay. This embodiment has three second signal indicator lights: two are connected to the second PLC controller via fifth relays, and the last is connected to the PLC controller via a sixth relay. In the circuit, the three second signal indicator lights are represented by LD7, LD8, and LD9, respectively. The fifth relay is represented by KA-01, and the sixth relay by KA-02. Specifically, the circuit connection is as follows: the positive terminal of the coil of the fifth relay KA-01 is electrically connected to the signal output terminal of the second PLC controller, and the negative terminal is electrically connected to the GND terminal. The normally open terminal of the fifth relay KA-01 is connected in series with the second signal indicator light LD7 and then electrically connected to the 5V voltage output terminal of the second switching power supply. The normally closed terminal is connected in series with the second signal indicator light LD7 and then electrically connected to the 5V voltage output terminal of the second switching power supply. The common terminal is electrically connected to the GND terminal. The positive terminal of the coil of the sixth relay KA-02 is electrically connected to the signal output terminal of the second PLC controller, and the negative terminal of the coil is electrically connected to the GND terminal. The normally open terminal of the sixth relay KA-02 is connected in series with the second signal indicator LD9 and then electrically connected to the 5V voltage output terminal of the second switching power supply. The common terminal is electrically connected to the GND terminal.

[0056] Only when the water level values ​​detected by the second submersible water level sensor all exceed the set water level threshold, the signal output terminal of the second PLC controller outputs a signal to the positive terminal of the coil of the fifth relay KA-01, but not to the positive terminal of the coil of the sixth relay KA-02. The normally open terminal of the fifth relay KA-01 closes, the normally closed terminal opens, and the second signal indicator LD7 conducts and illuminates, indicating that the water level in the unit's pit is high (exceeding the set range). When the water level values ​​detected by the second submersible water level sensor all exceed the set water level threshold, and when the water level value detected by at least one of the detection elements of the second float-type water level gauge and the second capacitive water level gauge exceeds the set water level threshold, the signal output terminal of the second PLC controller outputs a signal to the positive terminal of the coil of the fifth relay KA-01, but not to the positive terminal of the coil of the sixth relay KA-02. The positive terminals of the coils of the fifth relay KA-01 and the sixth relay KA-02 output signals, the normally open terminals of the fifth relay KA-01 and the normally closed terminals of the sixth relay KA-02 close, and the normally closed terminals open. The first signal indicator lights LD7 and LD9 conduct and light up, indicating that the water level in the unit's pit is too high. When the water level values ​​detected by the second float-type water level gauge, the second capacitive water level gauge, and the second submersible water level sensor do not exceed the set threshold, the signal output terminal of the second PLC controller does not output signals to the positive terminals of the coils of the fifth relay KA-01 and the sixth relay KA-02. The normally closed terminal of the fifth relay KA-01 closes, and the second signal indicator light LD8 conducts and light up, indicating that the water level in the unit's pit is normal.

[0057] In summary, the flood-proof plant alarm and emergency shutdown system of this embodiment installs pump room water level monitoring devices and generator pit water level monitoring devices to detect water levels in the maintenance pump room and generator pit, respectively. The pump room emergency drainage pump and pump room water level monitoring devices are connected to the common equipment control unit, while the generator pit emergency drainage pump, generator pit water level monitoring device, and turbine generator set are connected to the unit control unit. When the water level detected by the pump room and generator pit water level monitoring devices is high, the common equipment control unit and the unit control unit respectively control the pump room emergency drainage pump and generator pit emergency drainage pump to operate, thereby pumping out the accumulated water in the pump room and generator pit, and issuing corresponding alarm signals. When the water level detected by the generator pit water level monitoring device is too high, the unit control unit controls the generator pit emergency drainage pump to operate and simultaneously controls the turbine generator set to stop operating, issuing corresponding alarm signals (the second signal indicator light illuminates). This achieves the purpose of activating alarm signals, starting emergency drainage pumps, and emergency shutdown when the water level is high or too high, ensuring the safe operation of the power plant's equipment.

Claims

1. A flood-proof plant alarm and emergency shutdown system, comprising an emergency drainage pump installed in the maintenance pump room, an emergency drainage pump installed in the generator pit, and a hydro-generator set installed on the generator set and equipment platform; Its features are, It also includes pump room water level monitoring devices, utility equipment control units, pit water level monitoring devices, and unit control units; The pump room water level monitoring device is installed in the maintenance pump room. It and the emergency drainage pump of the pump room are electrically connected to the common equipment control unit. It is used to detect the water level of the pump room and send the detection signal to the common equipment control unit. The common equipment control unit is used to control the start and stop of the emergency drainage pump of the pump room and issue an alarm according to the water level value. The pit water level monitoring device is installed in the unit pit. It and the pit emergency drainage pump are both electrically connected to the unit control unit. It is used to detect the water level in the pit and send the detection signal to the unit control unit. The unit control unit is used to control the start and stop of the pit emergency drainage pump and the turbine generator set and to issue an alarm according to the water level value.

2. The flood-proof factory alarm and emergency shutdown system according to claim 1, characterized in that, The pump house water level monitoring device includes a first float-type water level gauge, a first capacitive water level gauge, and a first submersible water level sensor.

3. The flood-proof factory alarm and emergency shutdown system according to claim 2, characterized in that, The public equipment control unit includes a first PLC controller, a first control button, a first touch screen, and a first alarm module; the first PLC controller is electrically connected to the emergency drainage pump of the pump room, the first float-type water level gauge, the first capacitive water level gauge, the first submersible water level sensor, the first control button, the first touch screen, and the first alarm module.

4. The flood-proof factory alarm and emergency shutdown system according to claim 3, characterized in that, A first relay and a first status indicator light are connected between the first PLC controller and the emergency drainage pump in the pump room.

5. The flood-proof factory alarm and emergency shutdown system according to claim 3, characterized in that, The first alarm module includes multiple first signal indicator lights that are electrically connected to the PLC controller, and each first signal indicator light is connected to the first PLC controller by a second relay.

6. The flood-proof factory alarm and emergency shutdown system according to claim 1, characterized in that, The pit water level monitoring device includes a second float-type water level gauge, a second capacitive water level gauge, and a second submersible water level sensor. The second submersible water level sensor is installed in the unit pit, while the second float-type water level gauge and the second capacitive water level gauge are installed on the unit and equipment platform.

7. The flood-proof factory alarm and emergency shutdown system according to claim 6, characterized in that, The unit control unit includes a second PLC controller, a second control button, a second touch screen, and a second alarm module. The second PLC controller is electrically connected to the pit emergency drainage pump, the turbine generator set, the second float-type water level gauge, the second capacitive water level gauge, the second submersible water level sensor, the second control button, the second touch screen, and the second alarm module.

8. The flood-proof factory alarm and emergency shutdown system according to claim 7, characterized in that, A third relay and a second status indicator are connected between the second PLC controller and the emergency drainage pump in the sump, and a fourth relay is connected between the second PLC controller and the turbine generator set.

9. The flood-proof factory alarm and emergency shutdown system according to claim 7, characterized in that, The second alarm module includes multiple second signal indicator lights that are electrically connected to the second PLC controller. Each of the multiple second signal indicator lights is connected to the second PLC controller by a fifth relay and a sixth relay.

10. The flood-proof factory alarm and emergency shutdown system according to any one of claims 1 to 9, characterized in that, It also includes a first power supply module and a second power supply module. The first power supply module includes a 220V AC mains power supply and a first switching power supply. The second power supply module includes a 220V AC mains power supply and a second switching power supply. The L and N terminals of the input terminals of the first and second switching power supplies are electrically connected to the L and N terminals of the 220V AC mains power supply, respectively. The output terminals of the first and second switching power supplies can output 24V DC voltage and 5V DC voltage.

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