Protection, measurement and control integrated control method and system for secondary bin of medium-voltage switchboard in nuclear power plant

Abstract

The invention relates to a protection, measurement and control integrated control method and system for a secondary bin of a medium-voltage switchboard in a nuclear power plant, and the method comprises the steps: carrying out the analysis and processing of a detection signal through an integrated protection device, and obtaining a protection function monitoring signal and a measurement function monitoring signal; the integrated protection device executes action judgment and protection control logic according to the protection function monitoring signal and / or the measurement function monitoring signal; the integrated protection device executes input and output control logic; and the integrated protection device outputs a display function signal and a measurement function signal of the secondary bin of the medium-voltage switchboard, and executes a recording function. The integrated protection device integrates protection, measurement, control and communication, greatly reduces the use of an intermediate relay, reduces the number of secondary bin components, simplifies related wiring, has a switching-on and switching-off loop monitoring function, shortens the maintenance period, reduces human errors, reduces the maintenance difficulty, has a fault recording function, and is suitable for popularization and application. And rapid fault analysis and positioning after protection action are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of medium - voltage switchboards in nuclear power plants, and more specifically, to a method and system for integrated protection, measurement and control of the secondary compartment of a medium - voltage switchboard in a nuclear power plant. Background Art

[0002] At present, the secondary compartments of medium - voltage switchboards in each nuclear power plant mainly follow the design technology of early nuclear power plants, and functions such as closing and opening, locking and alarming are all realized by relay connection. The secondary compartment control system with relay connection has problems such as relatively high failure rate, large workload of maintenance and repair, and difficult maintenance due to small space; at the same time, the interface mode between the secondary compartment control system with relay connection and the plant distributed control system (DCS) is hard - wiring, which also has problems such as a large amount of cables and inconvenience for transformation. Moreover, the number of components in the secondary compartment of the switchboard is large, and the interfaces and wiring between them are numerous, which may lead to a relatively high overall failure rate of the secondary compartment of the switchboard; the large number of secondary components and wiring leads to a relatively large workload and a long construction period for regular equipment maintenance; the space of the secondary compartment of some medium - voltage switchboards is very narrow, a large number of wirings are blocked, and maintenance is difficult. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method and system for integrated protection, measurement and control of the secondary compartment of a medium - voltage switchboard in a nuclear power plant in view of the problems existing in the prior art.

[0004] The technical solution adopted by the present invention to solve its technical problems is to construct a method for integrated protection, measurement and control of the secondary compartment of a medium - voltage switchboard in a nuclear power plant, including the following steps:

[0005] The integrated protection device collects the detection signals generated by the detection unit;

[0006] The integrated protection device analyzes and processes the detection signals to obtain protection function monitoring signals and measurement function monitoring signals;

[0007] The integrated protection device executes action judgment and protection control logic according to the protection function monitoring signals and / or the measurement function monitoring signals;

[0008] The integrated protection device executes input - output control logic;

[0009] The integrated protection device outputs display function signals and measurement function signals of the secondary compartment of the medium - voltage switchboard and executes the recording function.

[0010] In the method for integrated protection, measurement and control of the secondary compartment of a medium - voltage switchboard in a nuclear power plant according to the present invention, the protection function monitoring signals include: fault detection signals and / or fault judgment signals;

[0011] The integrated protection device executes action judgment and protection control logic based on the protection function monitoring signal and / or the measurement function monitoring signal, including:

[0012] The integrated protection device determines whether the device to be monitored is faulty based on the fault detection signal and / or the fault judgment signal;

[0013] If so, it outputs a fault alarm signal for the device to be monitored and outputs a switching control instruction;

[0014] If not, it does not execute the protection control logic.

[0015] In the integrated protection and measurement control method for the secondary bin of the medium-voltage switchboard in the nuclear power plant described in the present invention, the measurement function monitoring signals include: current signals, voltage signals, and / or frequency signals;

[0016] The integrated protection device executes action judgment and protection control logic based on the protection function monitoring signal and / or the measurement function monitoring signal, including:

[0017] The integrated protection device determines whether there is overcurrent based on the current signal;

[0018] If so, it executes overcurrent protection control logic; if not, it does not execute overcurrent protection control logic;

[0019] Alternatively, the integrated protection device determines whether there is overvoltage based on the voltage signal; if so, it executes overvoltage protection control logic; if not, it does not execute overvoltage protection control logic;

[0020] Alternatively, the integrated protection device determines whether the frequency signal is abnormal; if so, it executes abnormal protection control logic; if not, it does not execute abnormal protection control logic.

[0021] In the integrated protection and measurement control method for the secondary bin of the medium-voltage switchboard in the nuclear power plant described in the present invention, the integrated protection device outputs display function signals and measurement function signals for the secondary bin of the medium-voltage switchboard and executes the recording function, including:

[0022] The integrated protection device outputs and displays the device status signals and parameters of the secondary bin of the medium-voltage switchboard;

[0023] The integrated protection device outputs the measurement function signals of the secondary bin of the medium-voltage switchboard through sound alarm or visual alarm;

[0024] The integrated protection device completes the recording function by recording the fault status and / or fault events.

[0025] In the integrated protection, measurement and control method for the secondary bin of the medium-voltage switchboard in a nuclear power plant according to the present invention, the method further includes:

[0026] The integrated protection device monitors the state of the device to be monitored and obtains the state monitoring signal of the device to be monitored;

[0027] The integrated protection device determines the real-time state of the device to be monitored according to the state monitoring signal;

[0028] The integrated protection device outputs and displays the state alarm signal of the device to be monitored according to the real-time state;

[0029] The integrated protection device records the real-time state of the device to be monitored.

[0030] In the integrated protection, measurement and control method for the secondary bin of the medium-voltage switchboard in a nuclear power plant according to the present invention, the method further includes:

[0031] The integrated protection device monitors the state of the closing and opening control knob and judges whether the closing and opening control knob performs a closing operation;

[0032] If so, the integrated protection device monitors the state of the local / remote selection switch and obtains the state signal of the local / remote selection switch;

[0033] The integrated protection device determines the real-time state of the local / remote selection switch according to the state signal of the local / remote selection switch;

[0034] If the real-time state of the local / remote selection switch is the local control state, the integrated protection device outputs a closing command to the circuit breaker and records the closing operation of the closing and opening control knob and the output closing command;

[0035] If the real-time state of the local / remote selection switch is not the local control state, the integrated protection device does not output a closing command to the circuit breaker and records the closing operation of the closing and opening control knob.

[0036] In the integrated protection, measurement and control method for the secondary bin of the medium-voltage switchboard in a nuclear power plant according to the present invention, the method further includes:

[0037] The integrated protection device monitors the state of the closing and opening control knob and judges whether the closing and opening control knob performs an opening operation;

[0038] If so, the integrated protection device monitors the state of the local / remote selection switch and obtains the state signal of the local / remote selection switch;

[0039] The integrated protection device determines the real-time state of the local / remote selector switch according to the status signal of the local / remote selector switch;

[0040] If the real-time state of the local / remote selector switch is the local control state, the integrated protection device outputs a tripping command to the circuit breaker and records the tripping operation of the closing-opening control knob and the output tripping command;

[0041] If the real-time state of the local / remote selector switch is not the local control state, the integrated protection device does not output a tripping command to the circuit breaker and records the tripping operation of the closing-opening control knob.

[0042] In the integrated protection and measurement control method for the secondary bin of the medium-voltage switchboard in a nuclear power plant according to the present invention, the method further includes:

[0043] Monitor the state of the local / remote selector switch to obtain the real-time state signal of the local / remote selector switch;

[0044] Judge whether the local / remote selector switch is in the remote control state according to the real-time state signal of the local / remote selector switch;

[0045] If so, receive the remote closing-opening command;

[0046] The remote closing-opening command is connected to the closing-opening circuit of the circuit breaker through an intermediate relay.

[0047] In the integrated protection and measurement control method for the secondary bin of the medium-voltage switchboard in a nuclear power plant according to the present invention, the method further includes:

[0048] The integrated protection device collects the current signal of the current transformer;

[0049] The integrated protection device judges whether there is overcurrent according to the current signal;

[0050] If so, the integrated protection device outputs an overcurrent protection action signal and connects the overcurrent protection action signal to the tripping circuit and the closing blocking circuit of the circuit breaker.

[0051] The present invention also provides an integrated protection and measurement control system for the secondary bin of the medium-voltage switchboard in a nuclear power plant, including: an integrated protection device; the integrated protection device includes: a logic processing unit and a memory; a computer program is stored in the memory; the logic processing unit executes the steps of the integrated protection and measurement control method for the secondary bin of the medium-voltage switchboard in a nuclear power plant as described in any one of the above by calling the computer program stored in the memory.

[0052] The secondary bin protection, measurement and control integrated control method and system for the medium-voltage distribution board of a nuclear power plant implementing the present invention have the following beneficial effects: including: the integrated protection device analyzes and processes the detection signals to obtain protection function monitoring signals and measurement function monitoring signals; the integrated protection device executes action judgment and protection control logic according to the protection function monitoring signals and / or measurement function monitoring signals; the integrated protection device executes input-output control logic; the integrated protection device outputs display function signals and measurement function signals of the secondary bin of the medium-voltage distribution board and executes the recording function. The integrated protection device of the present invention integrates protection, measurement, control and communication, greatly reducing the use of intermediate relays, reducing the number of components in the secondary bin and simplifying the relevant wiring, having the function of monitoring the closing and opening circuits, shortening the maintenance period, reducing human errors, reducing the maintenance difficulty, having the function of fault recording, and facilitating the rapid fault analysis and positioning after the protection action. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0054] Figure 1 is a schematic flow chart of the secondary bin protection, measurement and control integrated control method for the medium-voltage distribution board of a nuclear power plant provided by the present invention;

[0055] Figure 2 is a specific schematic flow chart of the secondary bin protection, measurement and control integrated control method for the medium-voltage distribution board of a nuclear power plant provided by the present invention;

[0056] Figure 3 is a schematic flow chart of the breaker opening state monitoring and control provided by the present invention;

[0057] Figure 4 is a schematic flow chart of the breaker closing state monitoring and control provided by the present invention;

[0058] Figure 5 is a schematic flow chart of the local closing control provided by the present invention;

[0059] Figure 6 is a schematic flow chart of the local opening control provided by the present invention;

[0060] Figure 7 and Figure 8 is an application wiring diagram of the secondary bin protection, measurement and control integrated control system for the medium-voltage distribution board of a nuclear power plant provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0061] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0062] In order to solve the problems of high overall secondary failure rate of medium-voltage switchboards in existing nuclear power plants, large maintenance workload and small maintenance space due to many secondary components and wiring, inconvenient fault analysis and location after protection action, and inconvenient far-transmission signal interface and later function expansion, etc., the present invention designs an integrated protection device with the function of integrated protection and measurement and control, integrates functions such as closing and opening, locking and alarming originally connected by relays into the integrated protection device, and realizes functions such as protection, measurement, control, and communication through the integrated protection device, greatly reducing the use of intermediate relays.

[0063] Specifically, referring to Figure 1 , Figure 1 is a flowchart of a preferred embodiment of the integrated protection and measurement and control method for the secondary bin of the medium-voltage switchboard in a nuclear power plant provided by the present invention.

[0064] As Figure 1 shown, the integrated protection and measurement and control method for the secondary bin of the medium-voltage switchboard in a nuclear power plant includes the following steps:

[0065] Step S101: The integrated protection device collects the detection signals generated by the detection unit.

[0066] Optionally, in the embodiments of the present invention, the detection unit may include, but is not limited to, any one or more of a current transformer, a voltage transformer (CT sensor), and a temperature sensor (PT sensor). Among them, the current of the device to be monitored can be detected through the current transformer, the voltage of the device to be monitored can be detected through the voltage transformer, and the temperature of the device to be monitored and the ambient temperature of the system, etc. can be detected through the temperature sensor.

[0067] Step S102: The integrated protection device analyzes and processes the detection signals to obtain protection function monitoring signals and measurement function monitoring signals.

[0068] Step S103: The integrated protection device executes action judgment and protection control logic according to the protection function monitoring signals and / or measurement function monitoring signals.

[0069] Step S104: The integrated protection device executes input / output control logic.

[0070] Step S105: The integrated protection device outputs the display function signal and measurement function signal of the secondary bin of the medium-voltage switchboard, and performs the recording function.

[0071] In a specific embodiment, as Figure 2 shown, the protection function monitoring signals include: fault detection signals and / or fault judgment signals; the integrated protection device performs action judgment and protection control logic according to the protection function monitoring signals and / or measurement function monitoring signals, including: the integrated protection device judges whether the device to be monitored is faulty according to the fault detection signals and / or fault judgment signals; if so, it outputs the fault alarm signal of the device to be monitored and outputs the closing and opening control instructions; if not, it does not execute the protection control logic.

[0072] As Figure 2 shown, the measurement function monitoring signals include: current signals, voltage signals and / or frequency signals; the integrated protection device performs action judgment and protection control logic according to the protection function monitoring signals and / or measurement function monitoring signals, including: the integrated protection device judges whether there is overcurrent according to the current signal; if so, it executes the overcurrent protection control logic; if not, it does not execute the overcurrent protection control logic; or, the integrated protection device judges whether there is overvoltage according to the voltage signal; if so, it executes the overvoltage protection control logic; if not, it does not execute the overvoltage protection control logic; or, the integrated protection device judges whether the frequency signal is abnormal; if so, it executes the abnormal protection control logic; if not, it does not execute the abnormal protection control logic.

[0073] As Figure 2 shown, the integrated protection device outputs the display function signal and measurement function signal of the secondary bin of the medium-voltage switchboard, and performs the recording function, including: the integrated protection device outputs and displays the device status signals and parameters of the secondary bin of the medium-voltage switchboard; the integrated protection device outputs the measurement function signal of the secondary bin of the medium-voltage switchboard through sound alarm or visual alarm; the integrated protection device completes the recording function by recording the fault status and / or fault event.

[0074] Furthermore, in the embodiment of the present invention, the protection and measurement integrated control method for the secondary bin of the medium-voltage switchboard in a nuclear power plant further includes: the integrated protection device monitors the status of the device to be monitored to obtain the status monitoring signal of the device to be monitored; the integrated protection device determines the real-time status of the device to be monitored according to the status monitoring signal; the integrated protection device outputs and displays the status alarm signal of the device to be monitored according to the real-time status; the integrated protection device records the real-time status of the device to be monitored.

[0075] Specifically, in the embodiments of the present invention, the integrated protection device can collect the status of the device to be monitored and display the status of the device to be monitored through indicator lights on its panel. Among them, the device to be monitored may include, but is not limited to, the air switch of the control loop, the position of the circuit breaker trolley, the status of the PT fuse, etc. Hereinafter, the circuit breaker will be taken as an example for illustration.

[0076] As Figure 3 shown, the integrated protection device (i.e., 001XI in the figure) continuously detects the status of the circuit breaker opening position contact, obtains the contact signal of the circuit breaker opening position (i.e., the status monitoring signal of the device to be monitored), and then determines whether the circuit breaker is opened through the contact signal of the circuit breaker opening position. If so, the integrated protection device controls the circuit breaker opening position status indicator light to light up. At the same time, the integrated protection device records the opening status of the circuit breaker; if not, the integrated protection device does not light up the circuit breaker opening position status indicator light.

[0077] As Figure 4 shown, the integrated protection device continuously detects the status of the circuit breaker closing position contact, obtains the contact signal of the circuit breaker closing position (i.e., the status monitoring signal of the device to be monitored), and then determines whether the circuit breaker is closed through the contact signal of the circuit breaker closing position. If so, the integrated protection device controls the circuit breaker closing position status indicator light to light up. At the same time, the integrated protection device records the closing status of the circuit breaker; if not, the integrated protection device does not light up the circuit breaker closing position status indicator light.

[0078] Similarly, the principles and control logics of the status of the control loop air switch, the position of the circuit breaker trolley, and the status of the PT fuse are similar to Figure 3 and Figure 4 and will not be elaborated here.

[0079] Furthermore, in the embodiments of the present invention, the integrated control method for protection and measurement and control in the secondary bin of the medium-voltage switchboard in the nuclear power plant further includes: the integrated protection device monitors the status of the closing and opening control knob and determines whether the closing and opening control knob performs a closing operation; if so, the integrated protection device monitors the status of the local / remote selection switch and obtains the status signal of the local / remote selection switch; the integrated protection device determines the real-time status of the local / remote selection switch according to the status signal of the local / remote selection switch; if the real-time status of the local / remote selection switch is the local control status, the integrated protection device outputs a closing command to the circuit breaker and records the closing operation of the closing and opening control knob and the output closing command; if the real-time status of the local / remote selection switch is not the local control status, the integrated protection device does not output a closing command to the circuit breaker and records the closing operation of the closing and opening control knob.

[0080] Further, in the embodiment of the present invention, the integrated protection and measurement and control method for the secondary bin of the medium-voltage distribution panel in the nuclear power plant further includes: the integrated protection device monitors the state of the closing and opening control knob, and judges whether the closing and opening control knob performs an opening operation; if so, the integrated protection device monitors the state of the local / remote selection switch to obtain the state signal of the local / remote selection switch; the integrated protection device determines the real-time state of the local / remote selection switch according to the state signal of the local / remote selection switch; if the real-time state of the local / remote selection switch is the local control state, the integrated protection device outputs an opening command to the circuit breaker, and records the opening operation of the closing and opening control knob and the output opening command; if the real-time state of the local / remote selection switch is not the local control state, the integrated protection device does not output an opening command to the circuit breaker, and records the opening operation of the closing and opening control knob.

[0081] Specifically, as Figure 5 shown, when the closing and opening control knob (i.e., 031CC in the figure) selects the "closing" operation, if the local / remote selection switch (i.e., 032CC in the figure) selects "local", then 001XI issues a closing command to the circuit breaker. At the same time, 001XI records the closing operation of 0031CC and the closing command output by 001XI itself; if 0032CC selects "remote", then 001XI does not issue a closing command to the circuit breaker, and at the same time, 001XI records the closing operation of 0031CC.

[0082] As Figure 6 shown, when 0031CC selects the "opening" operation, if 0032CC selects "local", then 001XI issues an opening command to the circuit breaker. At the same time, 001XI records the opening operation of 0031CC and the opening command output by 001XI itself; if 0032CC selects "remote", then 001XI does not issue an opening command to the circuit breaker, and at the same time, 001XI records the opening operation of 0031CC.

[0083] Further, in the embodiment of the present invention, the integrated protection and measurement and control method for the secondary bin of the medium-voltage distribution panel in the nuclear power plant further includes: monitoring the state of the local / remote selection switch to obtain the real-time state signal of the local / remote selection switch; judging whether the local / remote selection switch is in the remote control state according to the real-time state signal of the local / remote selection switch; if so, receiving the remote closing and opening command; the remote closing and opening command is connected to the closing and opening circuit of the circuit breaker through an intermediate relay.

[0084] Further, in the embodiment of the present invention, the integrated protection and measurement and control method for the secondary bin of the medium-voltage switchboard in the nuclear power plant further includes: the integrated protection device collects the current signal of the current transformer; the integrated protection device determines whether there is overcurrent according to the current signal; if so, the integrated protection device outputs an overcurrent protection action signal and connects the overcurrent protection action signal to the breaker tripping circuit and the closing interlock circuit.

[0085] Specifically, as Figure 7 shown, one contact of the overcurrent protection action signal of the integrated protection device 001XI is connected to the closing interlock circuit, and the other is connected to the breaker tripping circuit (i.e., the protection trip / shutdown circuit), so that the overcurrent protection action signal can be connected to the breaker tripping circuit and the closing interlock circuit. As Figure 7 shown, the breaker closing and tripping circuit is Figure 7 the part marked "2" in Figure 7 and the closing interlock circuit is

[0086] In addition, the present invention also provides an integrated protection, measurement and control system for the secondary bin of the medium-voltage switchboard in the nuclear power plant, including: an integrated protection device; the integrated protection device includes: a logic processing unit and a memory; a computer program is stored in the memory; the logic processing unit executes the integrated protection and measurement and control method for the secondary bin of the medium-voltage switchboard in the nuclear power plant as described in any one of the above by calling the computer program stored in the memory. Specifically, according to the embodiment of the present invention, the process described with reference to the flowchart above can be implemented as a computer software program. For example, the embodiment of the present invention includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes program codes for executing the method shown in the flowchart. In such an embodiment, when the computer program is downloaded and installed by an electronic device and executed, it executes the above functions defined in the method of the embodiment of the present invention.

[0087] In the embodiment of the present invention, the integrated protection device 001XI can collect the status of the breaker and display the breaker status through an indicator light on its panel; collect the status of the control circuit air switch, the breaker trolley position, the PT fuse status, etc., and can send out alarms and displays after logical processing. Specifically, see Figure 8 the signals marked "4" and other signals in the entire row in Figure 8 wherein,

[0088] It should be noted that the present invention Figure 7 and Figure 8All components, contacts, etc. marked with 001XI are integrated protection devices, mainly including input contacts 001XI-X110, 001XI-X120, 001XI-X130, output contacts 001XI-PO1, 001XI-PO2, 001XI-PO3, 001XI-PO4, etc. Among them, the logic processing unit, etc. is not shown in the figure, and functions such as protection, measurement, input / output control, display, and alarm can be realized.

[0089] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. For the relevant parts, reference can be made to the description in the method section.

[0090] Those skilled in the art can further realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed in this article can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of the examples have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0091] The steps of the methods or algorithms described in combination with the embodiments disclosed in this article can be directly implemented by hardware, software modules executed by a processor, or a combination of the two. The software modules can be placed in a random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium well-known in the technical field.

[0092] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention, and their purpose is to enable those familiar with this technology to understand the content of the present invention and implement it accordingly, and cannot limit the protection scope of the present invention. All equivalent changes and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A method for integrated control of secondary compartment protection, measurement and control of medium-voltage switchboard in a nuclear power plant, characterized in that: The following steps are involved: The integrated protection device collects the detection signal generated by the detection unit; The integrated protection device analyzes and processes the detection signal to obtain a protection function monitoring signal and a measurement function monitoring signal; The integrated protection device executes action judgment and protection control logic according to the protection function monitoring signal and / or the measurement function monitoring signal; The integrated protection device executes input and output control logic; The integrated protection device outputs display function signals and measurement function signals of the secondary compartment of the medium voltage switchboard, and performs a recording function.

2. The integrated control method for secondary compartment protection, measurement and control of a medium voltage switchboard in a nuclear power plant according to claim 1 is characterized in that: The protection function monitoring signal includes: a fault detection signal and / or a fault judgment signal; The integrated protection device performs action judgment and protection control logic according to the protection function monitoring signal and / or the measurement function monitoring signal, including: The integrated protection device determines whether the monitored equipment is faulty according to the fault detection signal and / or the fault judgment signal; If yes, then output the fault alarm signal of the device to be monitored and output the opening and closing control instructions; If not, the protection control logic is not executed.

3. The integrated control method for secondary compartment protection, measurement and control of medium-voltage switchboard in a nuclear power plant according to claim 1 is characterized in that: The measurement function monitoring signal includes: a current signal, a voltage signal and / or a frequency signal; The integrated protection device performs action judgment and protection control logic according to the protection function monitoring signal and / or the measurement function monitoring signal, including: The integrated protection device determines whether there is overcurrent according to the current signal; If yes, the overcurrent protection control logic is executed; if no, the overcurrent protection control logic is not executed; Alternatively, the integrated protection device determines whether there is overvoltage according to the voltage signal; if so, the overvoltage protection control logic is executed; if not, the overvoltage protection control logic is not executed; Alternatively, the integrated protection device determines whether there is an abnormality based on the frequency signal; if so, the abnormal protection control logic is executed; if not, the abnormal protection control logic is not executed.

4. The integrated control method for secondary compartment protection, measurement and control of medium-voltage switchboard in a nuclear power plant according to claim 1 is characterized in that: The integrated protection device outputs the display function signal and the measurement function signal of the secondary compartment of the medium voltage switchboard, and performs the recording function including: The integrated protection device outputs and displays the equipment status signals and parameters of the secondary compartment of the medium voltage switchboard; The integrated protection device outputs the measurement function signal of the secondary compartment of the medium voltage switchboard through an audible alarm or a visual alarm; The integrated protection device completes the recording function by recording the fault status and / or fault event.

5. The integrated control method for secondary compartment protection, measurement and control of medium-voltage switchboard in a nuclear power plant according to claim 1, characterized in that: The method further comprises: The integrated protection device monitors the state of the equipment to be monitored and obtains a state monitoring signal of the equipment to be monitored; The integrated protection device determines the real-time status of the device to be monitored according to the status monitoring signal; The integrated protection device outputs and displays a status alarm signal of the device to be monitored according to the real-time status; The integrated protection device records the real-time status of the equipment to be monitored.

6. The integrated control method for secondary compartment protection, measurement and control of medium-voltage switchboard in a nuclear power plant according to claim 1, characterized in that: The method further comprises: The integrated protection device monitors the state of the closing and opening control knob, and determines the state of the closing and opening control knob to determine whether the closing and opening control knob performs a closing operation; If yes, the integrated protection device monitors the state of the local / remote selection switch to obtain a state signal of the local / remote selection switch; The integrated protection device determines the real-time state of the local / remote selection switch according to the state signal of the local / remote selection switch; If the real-time state of the local / remote selection switch is the local control state, the integrated protection device outputs a closing command to the circuit breaker, and records the closing operation of the closing and opening control knob and the output closing command; If the real-time state of the local / remote selection switch is not the local control state, the integrated protection device does not output a closing command to the circuit breaker, and records the closing operation of the closing and opening control knob.

7. The integrated control method for secondary compartment protection, measurement and control of medium-voltage switchboard in a nuclear power plant according to claim 1, characterized in that: The method further comprises: The integrated protection device monitors the state of the closing and opening control knob, and determines the state of the closing and opening control knob to determine whether the closing and opening control knob performs an opening operation; If yes, the integrated protection device monitors the state of the local / remote selection switch to obtain a state signal of the local / remote selection switch; The integrated protection device determines the real-time state of the local / remote selection switch according to the state signal of the local / remote selection switch; If the real-time state of the local / remote selection switch is the local control state, the integrated protection device outputs an opening command to the circuit breaker, and records the opening operation of the closing and opening control knob and the output opening command; If the real-time state of the local / remote selection switch is not the local control state, the integrated protection device does not output an opening command to the circuit breaker, and records the opening operation of the closing and opening control knob.

8. The integrated control method for secondary compartment protection, measurement and control of medium-voltage switchboard in a nuclear power plant according to claim 1, characterized in that: The method further comprises: Monitor the status of the local / remote selection switch to obtain a real-time status signal of the local / remote selection switch; Determining whether the local / remote selection switch is in a remote control state according to a real-time state signal of the local / remote selection switch; If yes, receive remote closing and opening commands; The remote closing and opening commands are connected to the circuit breaker closing and opening circuits through an intermediate relay.

9. The integrated control method for secondary compartment protection, measurement and control of medium-voltage switchboard in a nuclear power plant according to claim 1, characterized in that: The method further comprises: The integrated protection device collects current signals from current transformers; The integrated protection device determines whether there is overcurrent according to the current signal; If so, the integrated protection device outputs an overcurrent protection action signal, and connects the overcurrent protection action signal to the circuit breaker opening circuit and closing locking circuit.

10. A nuclear power plant medium voltage switchboard secondary compartment protection measurement and control integrated control system, characterized in that: include: Integrated protection device; The integrated protection device includes: a logic processing unit and a memory; a computer program is stored in the memory; the logic processing unit executes the steps of the integrated control method for protection, measurement and control of the secondary compartment of the medium-voltage distribution board of a nuclear power plant as described in any one of claims 1 to 9 by calling the computer program stored in the memory.

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