A switch cabinet comprehensive fault alarm online detection device and method for nuclear power plant

Abstract

The present invention belongs to the technical field of low-voltage power distribution fault detection, and specifically relates to an online detection device and method for comprehensive fault alarm of switch cabinet for nuclear power plant, the device includes a single-chip computer module, a measurement module, a liquid crystal display module, an alarm module and an input module, wherein the single-chip computer module is respectively connected with the measurement module, the liquid crystal display module, the alarm module and the input module. The present invention is operated by buttons and displayed on a liquid crystal screen, and is easy to operate, intuitively displayed, low in manufacturing cost, stable in performance, and uses the principle of electromagnetic induction and non-contact measurement, which will not affect the stability of the low-voltage power distribution system; it can locate the location of the fault drawer online, greatly shortening the time for fault inspection and repair of the switch cabinet; it can locate the fault drawer online, without shutting down the entire busbar, and will not have any impact on the downstream load.

Description

Technical Field

[0001] The invention belongs to the technical field of low-voltage power distribution fault detection, and in particular relates to an online detection device and method for comprehensive fault alarm of a switch cabinet for a nuclear power plant. Background Art

[0002] Most of the low-voltage power distribution cabinets in nuclear power plants use MNS switch cabinets. The fault detection method of this switch cabinet is parallel. Once a drawer of a row of switch cabinets fails, the row of switch cabinets will generate a comprehensive alarm, but the specific location of the alarm drawer cannot be determined. If you want to find the location of a single fault drawer, you must power off the entire row of switch cabinets and check each drawer one by one, which is time-consuming and labor-intensive, and is not conducive to the safe and stable operation of the low-voltage power supply system.

[0003] When detecting switch cabinet faults, the faulty drawer can be accurately located in real time, providing more specific information for switch cabinet maintenance personnel. This is of great significance for shortening the maintenance time of the switch cabinet, improving maintenance efficiency, and ensuring the safe and stable operation of the low-voltage power supply system.

[0004] Therefore, it is necessary to provide a comprehensive fault alarm online detection device and method for a switch cabinet for a nuclear power plant to solve the deficiencies in the prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a device and method for online detection of switch cabinet fault alarm in view of the deficiencies in the above-mentioned prior art, which can locate the specific position of the faulty drawer online, is simple to operate, and has an intuitive and easy-to-understand display, so as to shorten the switch cabinet fault inspection and repair time and enhance the reliability of the low-voltage power supply system.

[0006] The technical solution of the present invention is:

[0007] A switch cabinet integrated fault alarm online detection device for a nuclear power plant comprises a single chip computer module, a measuring module, a liquid crystal display module, an alarm module and an input module, wherein the single chip computer module is respectively connected with the measuring module, the liquid crystal display module, the alarm module and the input module.

[0008] The single-chip microcomputer module includes a single-chip microcomputer U1, a resistor R1, a capacitor C1, a capacitor C2, an electrolytic capacitor C3, a crystal oscillator X1, a single-chip microcomputer reset button K1 and a resistor RP1, wherein the single-chip microcomputer U1 pin XTAL2 is connected to one end of the capacitor C2 and one end of the crystal oscillator X1, the other end of the crystal oscillator X1 is connected to one end of the capacitor C1 and the single-chip microcomputer U1 pin XTAL1, the other end of the capacitor C2 is connected to the other end of the capacitor C1 and the power supply GND; the single-chip microcomputer U1 pin RST is connected to one end of the single-chip microcomputer reset button K1, and the single-chip microcomputer reset button The other end of K1 is connected to the power supply +5V, the negative electrode of the electrolytic capacitor C3 is connected to the RST pin of the single-chip U1, the positive electrode of the electrolytic capacitor C3 is connected to the power supply +5V, one end of the resistor R1 is connected to the RST pin of the single-chip U1, and the other end of the resistor R1 is connected to the power supply GND; the EA / Vpp and Vcc pins of the single-chip U1 are connected to the power supply +5V, and the Vss pin is connected to the power supply GND; the pin a of the resistor RP1 is connected to the power supply +5V, and the pins b to i of the resistor RP1 are respectively connected to the P0.0 to P0.7 pins of the single-chip U1;

[0009] The single chip microcomputer U1 adopts STC89C52 single chip microcomputer.

[0010] The measuring module includes a light-emitting diode D1, a resistor R3, an optocoupler isolation chip U2 and a winding magnetic ring L1, wherein the positive pole of the light-emitting diode D1 is connected to the pin P2.7 of the microcontroller U1, and the negative pole is connected to the pin A of the optocoupler isolation chip U2; one end of the resistor R3 is connected to the power supply GND, and the other end is connected to the pin K of the optocoupler isolation chip U2, and the pins C and E of the optocoupler isolation chip U2 are respectively connected to the two ends of the winding magnetic ring L1.

[0011] The liquid crystal display module includes a liquid crystal display screen LCD1 and a potentiometer RP2, wherein the pin VSS of the liquid crystal display screen LCD1 is connected to the power ground, the pin VDD is connected to the power supply +5V, the pin VEE is connected to the adjustable pin of the potentiometer RP2, the pins RS, RW, and E are respectively connected to the pins P2.4, P2.5, and P2.6 of the microcontroller U1, and the pins D0 to D7 are respectively connected to the pins P0.0 to P0.7 of the microcontroller U1; the two fixed pins of the potentiometer RP2 are respectively connected to the power supply +5V and the power supply GND.

[0012] The liquid crystal display screen LCD1 adopts a LCD1602 type liquid crystal display screen.

[0013] The alarm module includes a resistor R2, a transistor Q1 and a buzzer BUZ1, wherein one end of the resistor R2 is connected to the pin P2.1 of the microcontroller U1, the other end of the resistor R2 is connected to the base of the transistor Q1, the emitter of the transistor Q1 is connected to the power supply +5V, the collector of the transistor Q1 is connected to the positive pole of the buzzer BUZ1, and the negative pole of the buzzer BUZ1 is connected to the power supply GND.

[0014] The input module includes an alarm reset button K2 and a page turning button K3, wherein one end of the alarm reset button K2 is connected to the microcontroller pin P1.0 and the other end is connected to the power supply GND, and one end of the page turning button K3 is connected to the microcontroller pin P1.1 and the other end is connected to the power supply GND.

[0015] The detection method of the integrated fault alarm online detection device for a switch cabinet for a nuclear power plant comprises the following steps:

[0016] Step 1: Connect the circuits between the modules;

[0017] Step 2: Lead the alarm signal line from the drawer to be tested through the winding magnetic ring L1 of the measuring module and fix it;

[0018] Step 3: Connect the device to a +5V power supply. The LCD screen will light up and the device will issue an online fault detection alarm.

[0019] If no drawer has a fault alarm in the step 3, the display screen displays "no alarm"; if a drawer has a fault alarm, the alarm buzzer sounds and the display screen displays "alarm drawer number + alarm". When multiple drawers have alarms, press the page turning key K2 to display the alarm drawer numbers one by one.

[0020] In the step 3, when the alarm of the fault alarm drawer is eliminated, the alarm reset key K3 is pressed to reset the device alarm signal.

[0021] In step 3, when a fault occurs in the device, the entire device is reset by pressing the microcontroller reset button K1.

[0022] The present invention has the following beneficial effects:

[0023] (1) The integrated fault alarm online detection device for a switch cabinet for a nuclear power plant of the present invention is operated by buttons and displayed on a liquid crystal screen, which is easy to operate and intuitive to display.

[0024] (2) The integrated fault alarm online detection device for a switch cabinet for a nuclear power plant of the present invention has low manufacturing cost and stable performance.

[0025] (3) The present invention is a nuclear power plant switch cabinet comprehensive fault alarm online detection device, which uses the principle of electromagnetic induction and adopts non-contact measurement and will not affect the stability of the low-voltage power distribution system.

[0026] (4) The integrated fault alarm online detection device for a switch cabinet for a nuclear power plant of the present invention can locate the position of a faulty drawer online, thus greatly shortening the time for troubleshooting the switch cabinet.

[0027] (5) The integrated fault alarm online detection device for switch cabinets used in nuclear power plants of the present invention can locate the faulty drawer online without shutting down the entire busbar and will not have any impact on the downstream load. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A circuit connection diagram of a comprehensive fault alarm online detection device for a switch cabinet for a nuclear power plant provided by the present invention;

[0029] Figure 2 A circuit diagram of a single-chip microcomputer module in an online detection device for comprehensive fault alarm of a switch cabinet for a nuclear power plant provided by the present invention;

[0030] Figure 3 A circuit diagram of a measuring module in an online detection device for comprehensive fault alarm of a switch cabinet for a nuclear power plant provided by the present invention;

[0031] Figure 4 A circuit diagram of a liquid crystal display module in an online detection device for comprehensive fault alarm of a switch cabinet for a nuclear power plant provided by the present invention;

[0032] Figure 5 A circuit diagram of an alarm module in an online detection device for comprehensive fault alarm of a switch cabinet for a nuclear power plant provided by the present invention;

[0033] Figure 6 A circuit diagram of an input module in an online detection device for comprehensive fault alarm of a switch cabinet for a nuclear power plant provided by the present invention;

[0034] In the figure: 1- single chip microcomputer module; 2- measurement module; 3- liquid crystal display module; 4- alarm module; 5- input module. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with embodiments and drawings:

[0036] like Figure 1 As shown, the present invention provides an online detection device for comprehensive fault alarm of a switch cabinet for a nuclear power plant, which includes a single-chip computer module 1, a measuring module 2, a liquid crystal display module 3, an alarm module 4 and an input module 5, wherein the single-chip computer module 1 is connected to the measuring module 2, the liquid crystal display module 3, the alarm module 4 and the input module 5 respectively.

[0037] like Figure 2As shown, the single-chip microcomputer module 1 includes a single-chip microcomputer U1 and its external circuit. The single-chip microcomputer U1 adopts a STC89C52 single-chip microcomputer. The external circuit includes a resistor R1, a capacitor C1, a capacitor C2, an electrolytic capacitor C3, a crystal oscillator X1, a single-chip microcomputer reset button K1, and a resistor RP1; the single-chip microcomputer U1 pin XTAL2 is connected to one end of the capacitor C2 and one end of the crystal oscillator X1, the other end of the crystal oscillator X1 is connected to one end of the capacitor C1 and the single-chip microcomputer U1 pin XTAL1, the other end of the capacitor C2 is connected to the other end of the capacitor C1 and the power supply GND; the single-chip microcomputer U1 pin RST is connected to the single-chip microcomputer reset One end of the button K1 and the other end of the microcontroller reset button K1 are connected to the power supply +5V, the negative pole of the electrolytic capacitor C3 is connected to the pin RST of the microcontroller U1, and the positive pole of the electrolytic capacitor C3 is connected to the power supply +5V, one end of the resistor R1 is connected to the pin RST of the microcontroller U1, and the other end of the resistor R1 is connected to the power supply GND; the microcontroller U1 pin EA / Vpp and pin Vcc are connected to the power supply +5V, and the pin Vss is connected to the power supply GND; the resistor RP1 pin a is connected to the power supply +5V, and the resistor RP1 pins b to i are respectively connected to the microcontroller U1 pins P0.0 to P0.7.

[0038] like Figure 3 As shown, the measuring module 2 of the present invention includes a light-emitting diode D1, a resistor R3, an optocoupler isolation chip U2, and a winding magnetic ring L1; the positive pole of the light-emitting diode D1 is connected to the pin P2.7 of the single-chip computer U1, and the negative pole is connected to the pin A of the optocoupler isolation chip U2; one end of the resistor R3 is connected to the power supply GND, and the other end is connected to the pin K of the optocoupler isolation chip U2, and the pin C and pin E of the optocoupler isolation chip U2 are respectively connected to the two ends of the winding magnetic ring L1.

[0039] like Figure 4 As shown, the liquid crystal display module 3 of the present invention includes a liquid crystal display screen LCD1 and a potentiometer RP2, wherein the liquid crystal display screen LCD1 adopts an LCD1602 type liquid crystal display screen; the pin VSS of the liquid crystal display screen LCD1 is connected to the power ground, the pin VDD is connected to the power supply +5V, the pin VEE is connected to the adjustable pin of the potentiometer RP2, the pins RS, RW, and E are respectively connected to the pin P2.4, the pin P2.5, and the pin P2.6 of the microcontroller U1, and the pins D0 to D7 are respectively connected to the pin P0.0 to the pin P0.7 of the microcontroller U1; the two fixed pins of the potentiometer RP2 are respectively connected to the power supply +5V and the power supply GND.

[0040] like Figure 5 As shown, the alarm module 4 of the present invention includes a resistor R2, a transistor Q1, and a buzzer BUZ1. One end of the resistor R2 is connected to the pin P2.1 of the single-chip microcomputer U1, the other end of the resistor R2 is connected to the base of the transistor Q1, the emitter of the transistor Q1 is connected to the power supply +5V, the collector of the transistor Q1 is connected to the positive electrode of the buzzer BUZ1, and the negative electrode of the buzzer BUZ1 is connected to the power supply GND.

[0041] like Figure 6 As shown, the input module 5 of the present invention includes an alarm reset button K2 and a page turning button K3, one end of the alarm reset button K2 is connected to the microcontroller pin P1.0, and the other end is connected to the power supply GND; one end of the page turning button K3 is connected to the microcontroller pin P1.1, and the other end is connected to the power supply GND.

[0042] The invention provides a comprehensive fault alarm online detection device for switch cabinets for nuclear power plants. The device uses a winding magnetic ring and a peripheral circuit to convert the fault alarm drawer alarm signal into a switch signal recognizable by a single-chip microcomputer. The single-chip microcomputer displays the alarm drawer number on a liquid crystal display screen after corresponding processing and calculation. The input module 5 and the alarm module 4 are used for operation input and alarm output of the device, respectively.

[0043] The present invention also provides a detection method for a switch cabinet comprehensive fault alarm online detection device for a nuclear power plant, the method comprising the following steps:

[0044] Step 1: Connect the circuits between the modules;

[0045] Step 2: Lead the alarm signal line from the drawer to be tested through the winding magnetic ring L1 of the measuring module 2 and fix it;

[0046] Step 3: Connect the device to a +5V power supply. The LCD screen will light up and the device will issue an online fault detection alarm.

[0047] If no drawer has a fault alarm, the display screen shows "no alarm"; if a drawer has a fault alarm, the alarm buzzer sounds and the display screen shows "alarm drawer number + alarm". When multiple drawers have alarms, press the page key K2 to display the alarm drawer numbers one by one.

[0048] When the fault alarm drawer alarm is eliminated, press the alarm reset button K3 to reset the device alarm signal.

[0049] When the device fails, press the microcontroller reset button K1 to reset the entire device.

[0050] The number of measurement modules 2 can be determined according to the on-site application situation. If the number of I / O ports of the microcontroller is insufficient, an I / O port expansion chip can be used for expansion.

[0051] The present invention is described in detail above in conjunction with the embodiments, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention. The contents not described in detail in the present invention can adopt the existing technology.

Claims

1. A switch cabinet integrated fault alarm online detection device for a nuclear power plant, characterized in that: The device comprises a single-chip computer module (1), a measuring module (2), a liquid crystal display module (3), an alarm module (4) and an input module (5), wherein the single-chip computer module (1) is connected to the measuring module (2), the liquid crystal display module (3), the alarm module (4) and the input module (5) respectively; The single-chip microcomputer module (1) comprises a single-chip microcomputer U1, a resistor R1, a capacitor C1, a capacitor C2, an electrolytic capacitor C3, a crystal oscillator X1, a single-chip microcomputer reset button K1 and a resistor RP1, wherein a pin XTAL2 of the single-chip microcomputer U1 is connected to one end of the capacitor C2 and one end of the crystal oscillator X1, the other end of the crystal oscillator X1 is connected to one end of the capacitor C1 and a pin XTAL1 of the single-chip microcomputer U1, the other end of the capacitor C2 is connected to the other end of the capacitor C1 and a power supply GND; a pin RST of the single-chip microcomputer U1 is connected to one end of a reset button K1 of the single-chip microcomputer, and the reset button K1 of the single-chip microcomputer is connected to one end of the reset button K2 of the single-chip microcomputer. The other end of key K1 is connected to the power supply +5V, the negative electrode of electrolytic capacitor C3 is connected to the RST pin of microcontroller U1, the positive electrode of electrolytic capacitor C3 is connected to the power supply +5V, one end of resistor R1 is connected to the RST pin of microcontroller U1, and the other end of resistor R1 is connected to the power supply GND; the EA / Vpp and Vcc pins of microcontroller U1 are connected to the power supply +5V, and the Vss pin is connected to the power supply GND; the pin a of resistor RP1 is connected to the power supply +5V, and the b-th pin to the i-th pin of resistor RP1 are respectively connected to the P0.0 to P0.7 pins of microcontroller U1; The single chip microcomputer U1 adopts STC89C52 single chip microcomputer; The measuring module (2) comprises a light emitting diode D1, a resistor R3, an optocoupler isolation chip U2 and a winding magnetic ring L1, wherein the positive electrode of the light emitting diode D1 is connected to the pin P2.7 of the single chip computer U1, and the negative electrode is connected to the pin A of the optocoupler isolation chip U2; one end of the resistor R3 is connected to the power supply GND, and the other end is connected to the pin K of the optocoupler isolation chip U2; the pins C and E of the optocoupler isolation chip U2 are respectively connected to the two ends of the winding magnetic ring L1; The liquid crystal display module (3) comprises a liquid crystal display screen LCD1 and a potentiometer RP2, wherein the pin VSS of the liquid crystal display screen LCD1 is connected to the power ground, the pin VDD is connected to the power supply +5V, the pin VEE is connected to the adjustable pin of the potentiometer RP2, the pin RS, the pin RW and the pin E are respectively connected to the pin P2.4, the pin P2.5 and the pin P2.6 of the single chip computer U1, the pin D0 to the pin D7 are respectively connected to the pin P0.0 to the pin P0.7 of the single chip computer U1; the two fixed pins of the potentiometer RP2 are respectively connected to the power supply +5V and the power supply GND; The liquid crystal display screen LCD1 adopts LCD1602 type liquid crystal display screen; The alarm module (4) comprises a resistor R2, a transistor Q1 and a buzzer BUZ1, wherein one end of the resistor R2 is connected to the pin P2.1 of the single-chip computer U1, the other end of the resistor R2 is connected to the base of the transistor Q1, the emitter of the transistor Q1 is connected to the power supply +5V, the collector of the transistor Q1 is connected to the positive electrode of the buzzer BUZ1, and the negative electrode of the buzzer BUZ1 is connected to the power supply GND; The input module (5) comprises an alarm reset button K2 and a page turning button K3, wherein one end of the alarm reset button K2 is connected to the microcontroller pin P1.0 and the other end is connected to the power supply GND, and one end of the page turning button K3 is connected to the microcontroller pin P1.1 and the other end is connected to the power supply GND.

2. The detection method of the integrated fault alarm online detection device for switch cabinets for nuclear power plants according to claim 1 is characterized in that: The method comprises the following steps: Step 1: Connect the circuits between the modules; Step 2: Lead the alarm signal line from the drawer to be tested through the winding magnetic ring L1 of the measuring module (2) and fix it; Step 3: Connect the device to a +5V power supply. The LCD screen lights up and the device detects faults online and gives an alarm. If no drawer has a fault alarm in step 3, the display screen displays "no alarm"; if a drawer has a fault alarm, the alarm buzzer sounds and the display screen displays "alarm drawer number + alarm". If multiple drawers have alarms, press the page key K2 to display the alarm drawer numbers one by one; In the step 3, when the alarm of the fault alarm drawer is eliminated, press the alarm reset key K3 to reset the device alarm signal; In step 3, when a fault occurs in the device, the entire device is reset by pressing the microcontroller reset button K1.

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