CN108492893B - Fault processing method for electric heating system - Google Patents
Fault processing method for electric heating system Download PDFInfo
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- CN108492893B CN108492893B CN201810120594.8A CN201810120594A CN108492893B CN 108492893 B CN108492893 B CN 108492893B CN 201810120594 A CN201810120594 A CN 201810120594A CN 108492893 B CN108492893 B CN 108492893B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
- G21C15/02—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention belongs to the technical field of nuclear power, and particularly relates to a fault processing method of an electric heating system, which is used for removing faults of the electric heating system of a liquid sodium metal cooling system of a fast reactor, wherein the fault judgment is mainly divided into three parts: the first part is whether the electric heating control power supply is normal or not; the second part is whether the components in the electric heating control cabinet are normal or not; the third part is whether the local junction box and the electric heating wire or the electric heater are normal. The invention carries out statistical classification on faults (electrical parts) possibly encountered by the electric heating system, can play a role of guiding maintenance, can improve the maintenance efficiency and shorten the maintenance time, thereby ensuring that the shutdown time of the fast reactor does not exceed the specified time, avoiding the solidification of sodium at an important part in a fast reactor cooling system and ensuring the stable operation of the fast reactor.
Description
Technical Field
The invention belongs to the technical field of nuclear power, and particularly relates to a fault processing method for an electric heating system.
Background
The fast reactor is a short for 'fast neutron reactor', is a preferred reactor type of a fourth-generation advanced nuclear energy system in the world, and represents the development direction of the fourth-generation nuclear energy system. The formed closed cycle of the nuclear fuel can improve the utilization rate of uranium resources to more than 60 percent, also can reduce the generation amount of nuclear waste to the maximum extent and realize the minimization of radioactive waste. The international society generally considers that the development and popularization of fast reactor can fundamentally solve the problems of sustainable development and green development of world energy.
Fast reactors have a high power density and do not allow the coolant to provide a strong moderating effect on neutrons, which requires a coolant with high heat transfer capacity and low moderating effect. There are two main types of coolant currently used: liquid metal sodium and helium. Depending on the type of coolant, fast reactors can be classified into sodium-cooled fast reactors and gas-cooled fast reactors. The gas-cooled fast reactor is only in the exploration stage at present because of the lack of industrial foundation, and the vibration caused by high-speed airflow and the great problem of core cooling loss after helium leakage. The sodium-cooled fast reactor is currently built and planned to be built in the world.
The Chinese experiment fast reactor adopts liquid metal sodium as a heat carrier of the reactor, so an electric heating system needs to be arranged for pipelines, valves and equipment of a nuclear island process system for storing or flowing sodium, the pipelines, the valves and the equipment are heated and insulated, the liquid sodium is prevented from being solidified, and thermal shock is prevented from being caused to the pipelines, the valves and the equipment by high temperature. Besides normal heating and heat preservation functions, the electric heating system also has the function of melting solid sodium and impurities thereof in solidified pipelines, valves and equipment. Some pipelines and equipment containing sodium vapor also need electric heating to prevent the sodium vapor from cooling and sublimating on the inner wall to block the pipelines and valve equipment.
Because the fast reactor needs to be opened for a long time, the time of each shutdown is strictly limited, if an electric heating fault occurs, the fault cannot be eliminated in time, so that sodium at an important part is solidified, the operation plan of the whole fast reactor is finally influenced, and the consequence is very serious.
Disclosure of Invention
Various faults which may occur to an electric heating system of a fast reactor are abstracted and summarized, a set of complete process for processing the electric heating faults is formed for a breaker switch, a fuse, a safety protector, a wiring terminal, a phase-shifting voltage regulating device, a potentiometer, a capacitor, an electric heating element, a cooling fan, a radiator, a change-over switch, a voltmeter, a cable, a local wiring box and the like of each control area of the electric heating system, and the process can better play a role in guiding maintenance for the electric heating system to break down later.
In order to achieve the above purpose, the technical scheme adopted by the invention is an electric heating system fault treatment method, which is used for removing faults of an electric heating system of a liquid metal sodium cooling system of a fast reactor, and comprises the following steps:
step 1, checking whether a breaker of a heating section corresponding to a power distribution cabinet of the electric heating system is in a switching-on position or not, if the breaker is in a switching-off position, switching on the breaker, measuring whether electricity exists on the lower side of the breaker by using a test pencil, if the electricity does not exist, indicating that the inside of the breaker has a fault, checking whether the switching-on and the switching-off of the inside of the breaker are normal by using a universal meter, and if the switching-on and the switching-off of the inside; if the breaker has no fault, executing the step 2;
step 2, checking whether the fuse is normally connected or disconnected by using a universal meter, if not, indicating that the fuse is burnt out, and replacing the fuse; otherwise, executing step 3;
step 3, checking the change-over switch, comprising:
step 3.1, checking whether the change-over switch is in a stop gear position, if so, switching the change-over switch to a PLC gear position, otherwise, executing the step 3.2; the PLC refers to a programmable logic controller;
step 3.2, checking whether the connection wire of the change-over switch has the phenomena of virtual connection and falling off, if so, fastening the connection wire, and executing step 4;
step 4, turning the change-over switch to a heating gear, checking whether a heating gear indicator lamp is lighted or not,
step 4.1, if the heating gear indicator lamp is not on, a universal meter is used for measuring whether voltage exists in a lamp socket wiring of the heating gear indicator lamp or not, if so, the heating gear indicator lamp is in fault, the heating gear indicator lamp is replaced, if not, the heating gear indicator lamp is in external fault, a control loop needs to be checked, and the step 4.2 is executed;
4.2, checking whether the heating section number remotely controlled by the main control room is the same as the heating section number between the electric rooms, if so, indicating that the data written in the background machine of the main control room is not correct and the corresponding data needs to be changed, otherwise, executing the step 4.3;
4.3, using a universal meter to measure whether the fuse of the control loop is on or off, if not, indicating that the fuse is burnt out and needs to be replaced, otherwise, executing the step 4.4;
step 4.4, turning the change-over switch to a PLC gear, if a PLC indicator lamp is not on, measuring whether a terminal of a wiring for transmitting a PLC control instruction in the power distribution cabinet outputs 220V or not by using a universal meter, if not, indicating that the PLC control instruction is not transmitted into the power distribution cabinet, and checking an indication output fault of the PLC; if yes, indicating that the PLC indicator lamp is in fault, and replacing the PLC indicator lamp; if the PLC indicator lamp is normal, executing step 5;
step 5, turning the change-over switch to a heating gear, changing over a voltmeter, selecting a point corresponding to the voltmeter, checking whether the voltmeter displays voltage, and executing the step 5.1;
step 5.1, if the voltmeter shows that no voltage exists, the multimeter checks whether the terminal of the corresponding heating section after the voltmeter outputs, if yes, the voltmeter is in failure, the voltmeter needs to be replaced, and if not, the step 5.2 is executed;
step 5.2, checking whether the electric heater in the electric cabinet has voltage or not, if not, cutting off the power, measuring the direct resistance value of the electric heater by using a universal meter, if not, indicating that the in-situ junction box internal wiring or the electric heater has a fault, and executing step 5.3;
step 5.3, checking whether the wiring connected to the electric heater in the local wiring box is correct or not according to a drawing, and if the wiring is incorrect, recovering the wrong wiring; otherwise, executing step 5.4;
step 5.4, removing the wiring of the electric heater in the local wiring box, measuring the resistance value of the electric heater by using a universal meter, and if the resistance value is not detected, indicating that the electric heater has a fault and needs to be replaced; if the resistance value is present, executing step 5.5;
step 5.5, checking the potentiometer, wherein the step 5.5.1 aiming at the heating gear potentiometer and the step 5.5.2 aiming at the heat preservation gear potentiometer are included;
step 5.5.1, checking whether the carbon film resistor of the heating gear potentiometer is in good contact, measuring the resistance value of the carbon film resistor of the heating gear potentiometer by using a universal meter, adjusting the heating gear potentiometer in the process of detecting the output voltage waveform, judging that the heating gear potentiometer has a fault when the output waveform has no change, replacing the heating gear potentiometer, and executing the step 5.5.2 if the heating gear potentiometer has no fault;
step 5.5.2, the change-over switch is switched to a heat preservation gear, whether the carbon film resistor of the heat preservation gear potentiometer is in good contact or not is checked, a universal meter is used for measuring the resistance value of the carbon film resistor of the heat preservation gear potentiometer, the heat preservation gear potentiometer is adjusted in the process of detecting the output voltage waveform, when the output waveform is not changed, the heat preservation gear potentiometer is judged to be in fault, the heat preservation gear potentiometer is replaced, and if the heat preservation gear potentiometer is checked to be in fault, the step 5.6 is executed;
step 5.6, checking the voltage regulating module, namely firstly, scanning a device which is put into operation by using an infrared thermal imager, wherein the device comprises the voltage regulating module, an RC (resistor-capacitor) circuit of the voltage regulating module and a direct current power supply PCB (printed circuit board) of the voltage regulating module; after the high temperature point of the device is determined, checking the equipment working condition of the high temperature point, then measuring the voltage waveform and the current output waveform of the thyristor end of the voltage regulating module by using an oscilloscope, checking whether the waveform is abnormal, checking the RC circuit and the DC power supply PCB of the voltage regulating module by using a multimeter and the oscilloscope, and finally checking the voltage of the output end by using the oscilloscope; when the abnormity is found during the inspection, the fault of the pressure regulating module is indicated, and the pressure regulating module is replaced; if the voltage regulating module is normal, executing the step 5.7;
step 5.7, checking the capacitor, measuring the capacitor by using a universal meter, if the capacity of the capacitor is lower than a standard value by 15%, indicating that the capacity of the capacitor is insufficient, and needing to be replaced, and if the capacity of the capacitor is normal, executing step 5.8;
step 5.8, checking whether the resistance of the RC circuit has a fault or not, and if the resistance of the RC circuit has the fault, replacing the resistance of the RC circuit; if the resistance of the RC circuit is normal, executing step 5.9;
and 5.9, checking whether the direct current power supply PCB has faults, measuring a rectifier diode bridge and a voltage stabilizing diode of the direct current power supply PCB, detecting that the output voltage values of the rectifier diode bridge and the voltage stabilizing diode are lower than 8V, determining that the direct current power supply PCB has faults and needs to be replaced, and executing the step 6 if the direct current power supply PCB is normal.
Further, in the present invention,
the method also comprises a step 6 of eliminating other faults, wherein the step 6 comprises a step 6.1 of fault of the wiring terminal, a step 6.2 of alarm of insulation check and a step 6.3 of fault of the cooling fan;
6.1, checking whether a wiring terminal cable is in virtual connection and burnt or not when the wiring terminal cable has a fault, and replacing the wiring terminal and fastening the wiring if the wiring terminal cable is in a virtual connection and burnt;
step 6.2, insulation monitoring alarm, including step 6.2.1 and step 6.2.2;
step 6.2.1, sequentially pulling open all incoming line circuit breakers in a switch cabinet related to the electric heating system in a distribution room of the electric heating system, keeping one incoming line circuit breaker in an open state each time, keeping the open state of the pulled incoming line circuit breaker for 30 seconds, and determining that the pulled incoming line circuit breaker has a fault when a fault alarm sound is eliminated; after the inlet line breaker with the fault is determined, measuring the insulation resistance value of an electric heater carried by the inlet line breaker with the fault by using a megohmmeter, and if the insulation resistance value is lower than 0.5M omega, replacing the electric heater;
step 6.2.2, sequentially pulling open all outgoing line breakers in a switch cabinet related to the electric heating system in a distribution room of the electric heating system, keeping one outgoing line breaker in an open state every time, keeping the open state of the pulled outgoing line breaker for 30 seconds, and determining that the pulled outgoing line breaker fails when a fault alarm sound is eliminated; after the outlet circuit breaker with the fault is determined, measuring the insulation resistance value of an electric heater carried by the outlet circuit breaker with the fault by using a megohmmeter, and if the resistance value is lower than 0.5M omega, replacing the electric heater;
step 6.3 cooling fan failure, comprising:
step 6.3.1, checking whether the fan rotates or not, and replacing the fan if the fan does not rotate;
and 6.3.2, if the bearing is damaged, and the noise and vibration of the fan during operation are increased when the fan is checked to be detected, the bearing is indicated to be in fault, and the bearing is replaced.
Further, in the present invention,
and 7, checking whether the heating section corresponding to the power distribution cabinet is normal or not.
Further, in the present invention,
in step 5.6, the waveform anomalies include: lack of wave head, asymmetry up and down, waveform distortion, voltage spike or current spike.
Further, in the present invention,
in step 5.8, the failure of the resistance of the RC circuit includes cracks and color blackening on the surface of the resistance of the RC circuit, and also includes burnt smell on the resistance of the RC circuit.
The invention has the beneficial effects that:
the faults (electrical parts) possibly encountered by the electric heating system are counted and classified, the maintenance guiding function can be achieved, the maintenance efficiency can be improved, the maintenance time is shortened, the shutdown time of the fast reactor is not longer than the specified time, the sodium solidification of the important part in the fast reactor cooling system is avoided, and the stable operation of the fast reactor is guaranteed.
Drawings
Fig. 1 is an inspection flowchart of a method for handling a fault in an electric heating system according to an embodiment of the present invention;
fig. 2 is a second flowchart of the method for processing faults of an electric heating system according to the embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
The fault judgment of the electric heating system of the liquid metal sodium cooling system of the fast reactor is mainly divided into three parts:
the first part is whether the electric heating control power supply is normal or not;
the second part is whether the components in the electric heating control cabinet are normal or not;
the third part is whether the local junction box and the electric heating wire or the electric heater are normal or not;
specific failures are summarized in table 1:
TABLE 1 statistical table of electric heating faults
The invention provides a fault treatment method of an electric heating system, which is used for removing faults of the electric heating system of a liquid metal sodium cooling system of a fast reactor, and comprises the following steps (shown in a flow chart in figures 1 and 2):
step 1, checking whether a breaker of a corresponding heating section in a power distribution cabinet of an electric heating system is in a switch-on position, if the breaker is in a switch-off position, switching on the breaker, measuring whether electricity exists on the lower side of the breaker by using a test pencil, if no electricity exists, indicating that the inside of the breaker has a fault, checking whether the inside of the breaker is normally switched on and off by using a universal meter, and if not, replacing the breaker; if the breaker has no fault, executing the step 2;
step 2, using a universal meter to check whether the fuse is normally connected or disconnected, if not, indicating that the fuse is burnt out, and replacing the fuse; otherwise, executing step 3;
step 3, checking the change-over switch, comprising:
step 3.1, checking whether the change-over switch is in a stop gear position, if so, switching the change-over switch to a PLC gear position, otherwise, executing the step 3.2; wherein, PLC refers to programmable logic controller;
step 3.2, checking whether the connection wire of the change-over switch has the phenomena of virtual connection and falling off, if so, fastening the connection wire (by using a screwdriver), and executing step 4;
step 4, turning the change-over switch to a heating gear, checking whether a heating gear indicator lamp is lighted or not,
step 4.1, if the heating gear indicator lamp is not on, a universal meter is used for measuring whether voltage exists in a lamp socket wiring of the heating gear indicator lamp or not, if so, the heating gear indicator lamp is in fault, the heating gear indicator lamp is replaced, if not, the external fault is detected, a control loop needs to be checked, and the step 4.2 is executed;
4.2, checking whether the heating section number remotely controlled by the main control room is the same as the heating section number between the electric rooms, if so, indicating that the data written in the background machine of the main control room is not correct and the corresponding data needs to be changed, otherwise, executing the step 4.3;
4.3, using a universal meter to measure whether the fuse of the control loop is on or off, if not, indicating that the fuse is burnt out and needs to be replaced, otherwise, executing the step 4.4;
step 4.4, turning the change-over switch to a PLC gear, if the PLC indicator lamp is not on, measuring whether a terminal of a wiring for transmitting a PLC control instruction in the power distribution cabinet outputs 220V or not by using a universal meter, if not, indicating that the PLC control instruction is not transmitted into the power distribution cabinet, and checking an indication output fault of the PLC; if yes, indicating that the PLC indicator lamp is in failure, and replacing the PLC indicator lamp; if the PLC indicator lamp is normal, executing step 5; (in the invention, "the terminal of the wiring for transmitting the PLC control command" is 3, 5 terminals in the "X" wiring row in the power distribution cabinet, "the" X "wiring row refers to the brand of the controlled wiring terminal row in the power distribution cabinet, such as C01-01-2, and the corresponding terminal row is the" X "wiring row of C01-01-2. in the process of checking the indication output fault of the PLC, the electric heating is provided by the electrical cabinet, the local control is provided by the PLC cabinet, and the remote control is provided by the PLC cabinet, the meaning here is that the control maintenance personnel check whether the corresponding wiring or component in the cabinet where the PLC is located is faulty or not.)
Step 5, turning the change-over switch to a heating gear, changing over the voltmeter, selecting a point corresponding to the voltmeter, checking whether the voltmeter displays voltage, and executing the step 5.1;
step 5.1, if the voltmeter shows that no voltage exists, the universal meter checks whether the terminal of the corresponding heating section after the voltmeter outputs, if yes, the voltmeter fault is indicated, the voltmeter needs to be replaced, and if not, the step 5.2 is executed;
step 5.2, checking whether the electric heater in the rear side of the electric cabinet has voltage or not, if not, cutting off the power, measuring the direct resistance value of the electric heater by using a universal meter, if not, indicating that the wire in the local junction box or the electric heater has a fault, and executing step 5.3;
step 5.3, checking whether the wiring connected with the electric heater in the local wiring box is correct according to a drawing, and if the wiring is incorrect, recovering the wrong wiring; otherwise (i.e. if the local junction box is correctly wired to the electric heater) step 5.4 is performed;
step 5.4, removing the wiring of the electric heater in the local wiring box, measuring the resistance value of the electric heater by using a universal meter, and if the resistance value is not detected, indicating that the electric heater has a fault and needs to be replaced; if the resistance value indicates that the electric heater is normal, executing step 5.5;
step 5.5, checking the potentiometer, wherein the step 5.5.1 aiming at the heating gear potentiometer and the step 5.5.2 aiming at the heat preservation gear potentiometer are included;
step 5.5.1, the heating gear potentiometer is a carbon film resistor, whether the carbon film resistor of the heating gear potentiometer is in good contact or not is checked, the resistance value of the carbon film resistor of the heating gear potentiometer is measured by a universal meter, the heating gear potentiometer is adjusted in the process of detecting the output voltage waveform, when the output waveform is not changed, the heating gear potentiometer is judged to be in fault, the heating gear potentiometer is replaced, and if the heating gear potentiometer is checked to be in fault, the step 5.5.2 is executed;
step 5.5.2, the change-over switch is switched to a heat preservation gear, the heat preservation gear potentiometer is a carbon film resistor, whether the carbon film resistor of the heat preservation gear potentiometer is in good contact is checked, the resistance value of the carbon film resistor of the heat preservation gear potentiometer is measured by a universal meter, the heat preservation gear potentiometer is adjusted in the process of detecting the output voltage waveform, when the output waveform is not changed, the heat preservation gear potentiometer is judged to be in fault, the heat preservation gear potentiometer is replaced, and if the heat preservation gear potentiometer is checked to be in fault, the step 5.6 is executed;
step 5.6, checking the voltage regulating module, namely firstly, scanning a device which is put into operation by using an infrared thermal imager, wherein the device comprises the voltage regulating module, an RC (resistor-capacitor) circuit of the voltage regulating module and a direct-current power supply PCB (printed circuit board) of the voltage regulating module; after the high temperature point of the device is determined, checking the equipment working condition of the high temperature point, then, measuring the voltage waveform and the current output waveform of the thyristor end of the voltage regulating module by using an oscilloscope, checking whether the waveform is abnormal (the waveform abnormality comprises wave head lack, upper and lower asymmetry, waveform distortion, voltage peak or current peak), checking an RC circuit and a DC power supply PCB (printed circuit board) of the voltage regulating module by using a multimeter and the oscilloscope, and finally checking the voltage of an output end by using the oscilloscope; when the abnormity is found during the inspection, the fault of the pressure regulating module is indicated, and the pressure regulating module is replaced; if the voltage regulating module is normal, executing the step 5.7;
step 5.7, checking the capacitor, measuring the capacitor by using a universal meter, if the capacity of the capacitor is lower than a standard value by 15%, indicating that the capacity of the capacitor is insufficient, and needing to be replaced, and if the capacity of the capacitor is normal, executing step 5.8;
step 5.8, checking whether the resistance of the RC circuit has a fault, and if the resistance of the RC circuit has the fault, replacing the resistance of the RC circuit (the fault of the resistance of the RC circuit comprises cracks on the surface of the resistance of the RC circuit, blackened colors and burnt odor of the resistance of the RC circuit); if the resistance of the RC circuit is normal, executing step 5.9;
and 5.9, checking whether the direct current power supply PCB (12V) has a fault, measuring a rectifier diode bridge and a voltage stabilizing diode of the direct current power supply PCB, if the output voltage values of the rectifier diode bridge and the voltage stabilizing diode are detected to be lower than 8V, determining that the direct current power supply PCB has the fault and needs to be replaced, and if the direct current power supply PCB is normal, executing the step 6.
Step 6, eliminating other faults, wherein the step 6 comprises a step 6.1 aiming at the faults of the wiring terminals, a step 6.2 aiming at insulation check alarming and a step 6.3 aiming at the faults of the cooling fan;
6.1, checking whether a wiring terminal cable is in virtual connection and burnt, if so, replacing the wiring terminal and fastening the wiring;
step 6.2, insulation monitoring alarm, including step 6.2.1 and step 6.2.2;
step 6.2.1, sequentially pulling open all incoming line circuit breakers in a switch cabinet related to the electric heating system in a distribution room of the electric heating system, keeping one incoming line circuit breaker in an open state each time, keeping the open state of the pulled incoming line circuit breaker for 30 seconds, and determining that the pulled incoming line circuit breaker breaks down when a fault alarm sound is eliminated; after the inlet line breaker with the fault is determined, measuring the insulation resistance value of an electric heater carried by the inlet line breaker with the fault by using a megohmmeter, and if the insulation resistance value is lower than 0.5M omega, replacing the electric heater;
step 6.2.2, sequentially pulling open all outgoing line breakers in a switch cabinet related to the electric heating system in a distribution room of the electric heating system, keeping one outgoing line breaker in an open state each time, keeping the open state of the pulled outgoing line breaker for 30 seconds, and determining that the pulled outgoing line breaker fails when the fault alarm sound is eliminated; after the outlet circuit breaker with the fault is determined, measuring the insulation resistance value of an electric heater carried by the outlet circuit breaker with the fault by using a megohmmeter, and if the resistance value is lower than 0.5 MOmega, replacing the electric heater;
step 6.3 cooling fan failure, comprising:
step 6.3.1, checking whether the fan rotates or not, and replacing the fan if the fan does not rotate;
and 6.3.2, if the bearing is damaged, and the noise and vibration of the fan during operation are increased during detection, indicating that the bearing is in failure, and replacing the bearing.
And finally, a step 7 of checking whether the corresponding heating section in the power distribution cabinet is recovered to be normal or not.
The device according to the present invention is not limited to the embodiments described in the specific embodiments, and those skilled in the art can derive other embodiments according to the technical solutions of the present invention, and also belong to the technical innovation scope of the present invention.
Claims (5)
1. A fault handling method for an electric heating system of a liquid sodium metal cooling system of a fast reactor is used for troubleshooting, and comprises the following steps:
step 1, checking whether a breaker of a heating section corresponding to a power distribution cabinet of the electric heating system is in a switching-on position or not, if the breaker is in a switching-off position, switching on the breaker, measuring whether electricity exists on the lower side of the breaker by using a test pencil, if the electricity does not exist, indicating that the inside of the breaker has a fault, checking whether the switching-on and the switching-off of the inside of the breaker are normal by using a universal meter, and if the switching-on and the switching-off of the inside; if the breaker has no fault, executing the step 2;
step 2, checking whether the fuse is normally connected or disconnected by using a universal meter, if not, indicating that the fuse is burnt out, and replacing the fuse; otherwise, executing step 3;
step 3, checking the change-over switch, comprising:
step 3.1, checking whether the change-over switch is in a stop gear position, if so, switching the change-over switch to a PLC gear position, otherwise, executing the step 3.2; the PLC refers to a programmable logic controller;
step 3.2, checking whether the connection wire of the change-over switch has the phenomena of virtual connection and falling off, if so, fastening the connection wire, and executing step 4;
step 4, turning the change-over switch to a heating gear, checking whether a heating gear indicator lamp is lighted or not,
step 4.1, if the heating gear indicator lamp is not on, a universal meter is used for measuring whether voltage exists in a lamp socket wiring of the heating gear indicator lamp or not, if so, the heating gear indicator lamp is in fault, the heating gear indicator lamp is replaced, if not, the heating gear indicator lamp is in external fault, a control loop needs to be checked, and the step 4.2 is executed;
4.2, checking whether the heating section number remotely controlled by the main control room is the same as the heating section number between the electric rooms, if so, indicating that the data written in the background machine of the main control room is not correct and the corresponding data needs to be changed, otherwise, executing the step 4.3;
4.3, using a universal meter to measure whether the fuse of the control loop is on or off, if not, indicating that the fuse is burnt out and needs to be replaced, otherwise, executing the step 4.4;
step 4.4, turning the change-over switch to a PLC gear, if a PLC indicator lamp is not on, measuring whether a terminal of a wiring for transmitting a PLC control instruction in the power distribution cabinet outputs 220V or not by using a universal meter, if not, indicating that the PLC control instruction is not transmitted into the power distribution cabinet, and checking an indication output fault of the PLC; if yes, indicating that the PLC indicator lamp is in fault, and replacing the PLC indicator lamp; if the PLC indicator lamp is normal, executing step 5;
step 5, turning the change-over switch to a heating gear, changing over a voltmeter, selecting a point corresponding to the voltmeter, checking whether the voltmeter displays voltage, and executing the step 5.1;
step 5.1, if the voltmeter shows that no voltage exists, the multimeter checks whether the terminal of the corresponding heating section after the voltmeter outputs, if yes, the voltmeter is in failure, the voltmeter needs to be replaced, and if not, the step 5.2 is executed;
step 5.2, checking whether the electric heater in the electric cabinet has voltage or not, if not, cutting off the power, measuring the direct resistance value of the electric heater by using a universal meter, if not, indicating that the in-situ junction box internal wiring or the electric heater has a fault, and executing step 5.3;
step 5.3, checking whether the wiring connected to the electric heater in the local wiring box is correct or not according to a drawing, and if the wiring is incorrect, recovering the wrong wiring; otherwise, executing step 5.4;
step 5.4, removing the wiring of the electric heater in the local wiring box, measuring the resistance value of the electric heater by using a universal meter, and if the resistance value is not detected, indicating that the electric heater has a fault and needs to be replaced; if the resistance value is present, executing step 5.5;
step 5.5, checking the potentiometer, wherein the step 5.5.1 aiming at the heating gear potentiometer and the step 5.5.2 aiming at the heat preservation gear potentiometer are included;
step 5.5.1, checking whether the carbon film resistor of the heating gear potentiometer is in good contact, measuring the resistance value of the carbon film resistor of the heating gear potentiometer by using a universal meter, adjusting the heating gear potentiometer in the process of detecting the output voltage waveform, judging that the heating gear potentiometer has a fault when the output waveform has no change, replacing the heating gear potentiometer, and executing the step 5.5.2 if the heating gear potentiometer has no fault;
step 5.5.2, the change-over switch is switched to a heat preservation gear, whether the carbon film resistor of the heat preservation gear potentiometer is in good contact or not is checked, a universal meter is used for measuring the resistance value of the carbon film resistor of the heat preservation gear potentiometer, the heat preservation gear potentiometer is adjusted in the process of detecting the output voltage waveform, when the output waveform is not changed, the heat preservation gear potentiometer is judged to be in fault, the heat preservation gear potentiometer is replaced, and if the heat preservation gear potentiometer is checked to be in fault, the step 5.6 is executed;
step 5.6, checking the voltage regulating module, namely firstly, scanning a device which is put into operation by using an infrared thermal imager, wherein the device comprises the voltage regulating module, an RC (resistor-capacitor) circuit of the voltage regulating module and a direct current power supply PCB (printed circuit board) of the voltage regulating module; after the high temperature point of the device is determined, checking the equipment working condition of the high temperature point, then measuring the voltage waveform and the current output waveform of the thyristor end of the voltage regulating module by using an oscilloscope, checking whether the waveform is abnormal, checking the RC circuit and the DC power supply PCB of the voltage regulating module by using a multimeter and the oscilloscope, and finally checking the voltage of the output end by using the oscilloscope; when the abnormity is found during the inspection, the fault of the pressure regulating module is indicated, and the pressure regulating module is replaced; if the voltage regulating module is normal, executing the step 5.7;
step 5.7, checking the capacitor, measuring the capacitor by using a universal meter, if the capacity of the capacitor is lower than a standard value by 15%, indicating that the capacity of the capacitor is insufficient, and needing to be replaced, and if the capacity of the capacitor is normal, executing step 5.8;
step 5.8, checking whether the resistance of the RC circuit has a fault or not, and if the resistance of the RC circuit has the fault, replacing the resistance of the RC circuit; if the resistance of the RC circuit is normal, executing step 5.9;
and 5.9, checking whether the direct current power supply PCB has faults or not, measuring a rectifier diode bridge and a voltage stabilizing diode of the direct current power supply PCB, detecting that the output voltage values of the rectifier diode bridge and the voltage stabilizing diode are lower than 8V, determining that the direct current power supply PCB has faults, and needing to replace the direct current power supply PCB, and executing a step 6 of eliminating other faults if the direct current power supply PCB is normal.
2. The electric heating system fault handling method of claim 1, wherein: the method also comprises a step 6 of eliminating other faults, wherein the step 6 comprises a step 6.1 of fault of the wiring terminal, a step 6.2 of alarm of insulation check and a step 6.3 of fault of the cooling fan;
6.1, checking whether a wiring terminal cable is in virtual connection and burnt or not when the wiring terminal cable has a fault, and replacing the wiring terminal and fastening the wiring if the wiring terminal cable is in a virtual connection and burnt;
step 6.2, insulation monitoring alarm, including step 6.2.1 and step 6.2.2;
step 6.2.1, sequentially pulling open all incoming line circuit breakers in a switch cabinet related to the electric heating system in a distribution room of the electric heating system, keeping one incoming line circuit breaker in an open state each time, keeping the open state of the pulled incoming line circuit breaker for 30 seconds, and determining that the pulled incoming line circuit breaker has a fault when a fault alarm sound is eliminated; after the inlet line breaker with the fault is determined, measuring the insulation resistance value of an electric heater carried by the inlet line breaker with the fault by using a megohmmeter, and if the insulation resistance value is lower than 0.5M omega, replacing the electric heater;
step 6.2.2, sequentially pulling open all outgoing line breakers in a switch cabinet related to the electric heating system in a distribution room of the electric heating system, keeping one outgoing line breaker in an open state every time, keeping the open state of the pulled outgoing line breaker for 30 seconds, and determining that the pulled outgoing line breaker fails when a fault alarm sound is eliminated; after the outlet circuit breaker with the fault is determined, measuring the insulation resistance value of an electric heater carried by the outlet circuit breaker with the fault by using a megohmmeter, and if the resistance value is lower than 0.5M omega, replacing the electric heater;
step 6.3 cooling fan failure, comprising:
step 6.3.1, checking whether the fan rotates or not, and replacing the fan if the fan does not rotate;
and 6.3.2, if the bearing is damaged, and the noise and vibration of the fan during operation are increased when the fan is checked to be detected, the bearing is indicated to be in fault, and the bearing is replaced.
3. A method of fault handling for an electrical heating system according to claim 2, wherein: and 7, checking whether the heating section corresponding to the power distribution cabinet is normal or not.
4. The electric heating system fault handling method of claim 1, wherein: in step 5.6, the waveform anomalies include: lack of wave head, asymmetry up and down, waveform distortion, voltage spike or current spike.
5. The electric heating system fault handling method of claim 1, wherein: in step 5.8, the failure of the resistance of the RC circuit includes cracks and color blackening on the surface of the resistance of the RC circuit, and also includes burnt smell on the resistance of the RC circuit.
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