CN110567740A - operation method for searching and rapidly processing high-voltage variable-frequency starting fault according to time sequence - Google Patents
operation method for searching and rapidly processing high-voltage variable-frequency starting fault according to time sequence Download PDFInfo
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- CN110567740A CN110567740A CN201910701726.0A CN201910701726A CN110567740A CN 110567740 A CN110567740 A CN 110567740A CN 201910701726 A CN201910701726 A CN 201910701726A CN 110567740 A CN110567740 A CN 110567740A
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- 238000001514 detection method Methods 0.000 claims description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000013307 optical fiber Substances 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
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- 239000010687 lubricating oil Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 claims description 3
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
the invention relates to an operation method for searching and rapidly processing high-voltage variable-frequency starting faults according to a time sequence, which comprises six fault processing and operation method steps of zero-second preparation of variable-frequency starting, one-second starting of the variable-frequency starting, three seconds starting, one hundred and fifty seconds of the variable-frequency starting, one hundred and eighty seconds of the variable-frequency starting and two seconds after grid connection, wherein the time points are easy to have faults. The fault of the frequency conversion system is judged according to the time sequence characteristic in starting, and the processing operation is carried out according to the fault characteristic, so that the fault processing time is reduced, and the running reliability of the equipment is improved.
Description
Technical Field
the application belongs to the technical field of fault diagnosis of starting of a high-voltage frequency conversion system, and particularly relates to an operation method for searching and rapidly processing a high-voltage frequency conversion starting fault according to a time sequence.
Background
1, No. 2 high-pressure air-blower is the core equipment of factory blast furnace equipment, their operation is good and bad, what of fault rate, directly influence the normal operating of steel mill blast furnace, because high-pressure frequency conversion starting system is high voltage, the heavy current, the equipment of high power, difficult point in the operation maintenance always, the trouble has all caused very big production loss at every turn, for this reason, according to the chronogenesis characteristics of high-pressure frequency conversion starting, how to let everybody can have a clearer thinking to the accident, thereby reduce the process time, guarantee production, it is a thing that needs to solve urgently.
disclosure of Invention
the technical problem to be solved by the invention is to provide an operation method for searching and rapidly processing the high-voltage variable-frequency starting fault according to the time sequence, which can rapidly operate and process the fault, thereby reducing the processing time and ensuring the production.
in order to solve the problems, the technical scheme adopted by the invention is as follows:
an operation method for searching and rapidly processing high-voltage frequency conversion starting faults according to a time sequence is characterized in that a plurality of time points of common faults are analyzed according to the time sequence characteristics of high-voltage frequency conversion starting, and then the targeted operation of the time points is carried out.
the technical scheme of the invention is further improved as follows: the time points of the common faults are six, and the six time points are respectively six time points of zero-second preparation for variable frequency starting, one second starting for the variable frequency starting, three seconds starting, one hundred fifty seconds for the variable frequency starting, one hundred eighty seconds for the variable frequency starting and two seconds after grid connection.
the technical scheme of the invention is further improved as follows: the method comprises the following specific steps:
step 1: at 0 second of start-up, the state is start-up process a: the operation on the computer is applied for starting, if the electric system is normal, a good signal is fed back to the operation, the operation on the computer is started immediately, the frequency conversion system works to enter the next state, namely, the subsequent state, and if the frequency conversion system is tripped immediately, the operation comprises the following steps:
step 1-1-1, checking an operation panel of a frequency conversion system, checking whether the alarm of a switch of a frequency conversion cabinet door is normal and processing, if so, turning to step 1-2-1, otherwise, turning to step 1-1-2;
step 1-1-2, checking an operation panel of the frequency conversion system, checking whether temperature and humidity detection of the frequency conversion cabinet is normal and processing, if so, turning to step 1-2-1, otherwise, turning to step 1-1-3;
step 1-1-3, checking an operation panel of the frequency conversion system, checking whether a main power supply and an auxiliary power supply of the frequency conversion cabinet are normal and processing, and if so, turning to step 1-2-1;
step 1-2-1, checking an operation panel of an excitation system, checking whether an excitation cabinet interlocking loop, namely a lubricating oil interlocking loop, a power oil interlocking loop and a top shaft system interlocking loop are normal and processing, if so, turning to step 1-3-1, otherwise, turning to step 1-2-2;
step 1-2-2, checking an operation panel of the excitation system, checking whether a PLC module of the excitation cabinet is normal and processing, if so, turning to step 1-3-1, otherwise, turning to step 1-2-3;
step 1-2-3, checking an operation panel of an excitation system, checking whether a safety relay loop of an excitation cabinet is normal and processing, and if so, turning to step 1-3-1;
step 1-3-1, checking a main motor unit, checking whether a water leakage detection device and a loop are normal or not, and replacing, if so, turning to step 2, otherwise, turning to step 1-3-2;
Step 1-3-2, checking a main motor unit, checking whether a motor winding temperature detection and air flow detection loop is normal and performing replacement processing, if so, turning to step 2, otherwise, turning to step 1-3-3;
1-3-3, checking a main motor unit, checking whether a brushless excitation circuit of the motor is normal and performing replacement processing, and if so, turning to the step 2;
and step 2, starting for 1 second, wherein the state is a starting state b: the MMIP of the interface unit of the excitation system controls the input of a protector of a frequency conversion cabinet, the input of a frequency conversion auxiliary system, an automatic switch-on frequency conversion outlet circuit breaker MBM, then an automatic switch-on frequency conversion inlet circuit breaker MBC, the frequency conversion cabinet is electrified and enters the next state, and if the circuit is immediately tripped, the operation is as follows, and the MMIP control circuit comprises the following steps:
Step 2-1-1, if the alarm shows that the MBM is not switched on, checking whether a change-over switch on the high-voltage cabinet is in a remote control state or not, and processing, if so, turning to step 2-2-1, otherwise, turning to step 2-1-2;
2-1-2, if the alarm shows that the MBM does not close the switch, checking whether a switch-on motor and a switch-on electromagnet of the high-voltage cabinet are good and processing, if so, turning to the step 2-2-1, otherwise, turning to the step 2-1-3;
step 2-1-3: if the alarm shows that the MBM is not switched on or is switched off immediately after switching on, checking whether the secondary plug of the high-voltage handcart is well inserted and processing, and if so, turning to the step 2-2-1;
step 2-2-1: if the alarm shows that the system is tripped immediately after the MBC is switched on, the MBC-CHECKBACK-FAILER is displayed, whether a feedback signal is normal after the high-pressure vacuum switch acts, whether an auxiliary contact is good and whether a link mechanism is deformed and processed are checked, if so, the step 3 is turned, and if not, the step 2-2-2 is turned;
Step 2-2-2: if the alarm shows that the system trips immediately after the MBC is switched on, the MBC-CHECKBACK-FAILER is displayed, whether the action time of the auxiliary contact of the high-pressure vacuum switch exceeds a set value or not is checked, the numerical value is adjusted or the handcart is pulled to a test position and is manually operated for 5-6 times, the feedback time is reduced, if yes, the step 3 is switched, and if not, the step 2-2-3 is switched;
step 2-2-3: if the alarm shows that the system is tripped immediately after the MBC is switched on, the MBC-CHECKBACK-FAILER is displayed, the action time limit of the auxiliary contact of the high-pressure vacuum switch is checked to be in a critical value, the system is restarted once again, and if the action time limit is in the critical value, the step 3 is turned to;
And 3, starting for 3 seconds, wherein the state is a starting state c, after the MBM switch and the MBC switch are switched on, the starting is mainly controlled by a frequency conversion system, the starting is started according to a fan starting torque curve, meanwhile, an excitation system gives a rectification signal and sends out excitation to increase torque at a synchronous rotating speed, and if the starting is tripped immediately, the operation is as follows, and the method comprises the following steps:
step 3-1-1, checking whether an excitation rectifying circuit is good, whether an excitation rectifying device has an alarm or not and can be reset or not, replacing a rectifying device and downloading parameters, if so, turning to step 3-2-1, otherwise, turning to step 3-1-2;
3-1-2, checking whether an excitation rectifying circuit is good, whether an excitation contactor acts reliably and whether the virtual connection is positive, if so, turning to the step 3-2-1, otherwise, turning to the step 3-1-3;
step 3-1-3: checking whether an excitation rectifying circuit is good or not, whether the excitation circuit has a short circuit or not, and removing and replacing the quick fuse, if so, turning to the step 3-2-1;
3-2-1, checking whether the frequency conversion system is normal and whether a frequency conversion device is given, replacing a connecting flat cable and a port-borrowing module from the frequency conversion control cabinet to the frequency conversion power cabinet, if so, turning to the step 4, otherwise, turning to the step 3-2-2;
3-2-2, checking whether the frequency conversion system is normal or not, checking whether the frequency conversion cabinet has abnormal smell or short-circuit smoke, checking and replacing the short-circuit damage power module and the controlled silicon, if so, turning to the step 4, otherwise, turning to the step 3-2-3;
3-2-3, checking whether the frequency conversion system is normal or not, if the frequency conversion cabinet has an overcurrent alarm, checking a triggering optical fiber interface, re-polishing an optical fiber head, or replacing a triggering plate and replacing a silicon controlled rectifier, and if so, turning to the step 4;
step 4, when the system is started for 150 seconds, the state is a starting state d, the electric system is started at a constant speed, after 1400 revolutions are reached, the motor control is controlled by a variable frequency controller, the no-load speed is accelerated to 1300 revolutions, the power reaches one hundred of 1MW, the motor speed loiters at 1400, the motor speed fluctuates greatly for many times, at the moment, a frequency conversion cabinet displays a power unit I side T to give an alarm, an excitation cabinet displays an SFC fault, and if the motor is tripped, the system is operated as follows, and comprises the following steps:
step 4-1-1 resetting and checking the ambient temperature or replacing the temperature sensing element, if yes, turning to step 5, otherwise, turning to step 4-1-2;
4-1-2, checking and reducing the load of a motor, adjusting the angle of the stator blade of the motor compressor to the minimum angle of 14 degrees, or recalibrating the angle of the stator blade to prevent zero drift and running processing, if so, turning to the step 5, otherwise, turning to the step 4-1-3;
step 4-1-3: checking and analyzing that the starting torque of the motor is slightly smaller than the mechanical torque, increasing the capacity of an electric network system, reducing the starting voltage drop, adjusting the active power of the number 1 sixty-thousand generator sets carried on the same section of high-voltage bus to 40000KVA and the reactive power to 5000KVAR, enabling the system voltage to be 10.8KV, if yes, turning to the step 5, otherwise, turning to the step 4-1-4;
step 4-1-4: starting backup allowance by using variable frequency, improving system voltage, adjusting an on-load adjusting tap of 11 thousands of main transformers to improve two gears, enabling the system voltage to reach 10.8KV, if yes, turning to the step 5, otherwise, turning to the step 4-1-5;
step 4-1-5: regulating a tap of a step-down transformer of the frequency conversion system by using the step-down variable regulation of the frequency conversion system, and if so, turning to the step 5;
step 5, when the motor is started for 180 seconds, the state is a starting state e, the variable frequency system drags the motor to uniformly accelerate, the speed of the motor reaches 1480 revolutions, the variable frequency starting main controller is switched from the main control in the variable frequency cabinet to the control in the excitation cabinet to enter the quasi-synchronous control, the grid connection cannot be carried out after the delay, if the system is tripped immediately, the operation is composed of the following sub-steps:
Step 5-1-1, checking and observing panel indicator lights of the synchronous devices, if two synchronous conditions of frequency and phase angle cannot be met, replacing synchronous spare parts, downloading software and calibrating, if yes, turning to step 6, otherwise, turning to step 5-1-2;
Step 5-1-2, checking and observing a synchronous indicator light of a device panel, if the frequency and the phase angle are met, and if the synchronous condition of the voltage cannot be met, the system voltage is not matched, adjusting the active power of the same bus generator to 38000KVA and the reactive power to 4000KVAR, and if the system voltage is not higher than 10.9KV, turning to step 6;
step 6, operating state f after grid connection: 2 seconds after grid connection, at the moment, after an electric system drags a motor to reach synchronous rotating speed and grid connection is successful, a frequency conversion cabinet automatically exits, a high-voltage switch MBL is switched on, high-voltage switches MBM and MBC exit, the control is switched to an excitation system, the motor synchronously operates, and before process loading, if step-out tripping is prevented, the operation is as follows:
checking whether the load of the motor is increased unstably, the motor is in a critical state, the reactive power is changed into the reactive power absorption state from the reactive power emission state, and the motor works at an unstable working point, operating and adjusting the set power factor, and adjusting the set power factor value from 0.99 to 0.97 in advance;
and 7: and (6) ending.
due to the adoption of the technical scheme, the invention has the beneficial effects that:
The invention provides an operation method for searching and rapidly processing high-voltage variable-frequency starting faults according to a time sequence, corresponding faults are analyzed according to six fault multi-occurrence points in the high-voltage variable-frequency starting, rapid processing operation is performed according to the faults, the fault time is greatly reduced, and the economic benefit is improved.
Drawings
FIG. 1 is a schematic flow diagram of the present invention.
Detailed Description
the present invention will be described in further detail with reference to examples.
The invention discloses an operation method for searching and rapidly processing high-voltage variable-frequency starting faults according to a time sequence, which is shown in figure 1.
the time points of the common faults are six, and the six time points are respectively six time points of zero-second preparation for variable frequency starting, one second starting for the variable frequency starting, three seconds starting, one hundred fifty seconds for the variable frequency starting, one hundred eighty seconds for the variable frequency starting and two seconds after grid connection.
the method comprises the following specific steps:
Step 1: at 0 second of start-up, the state is start-up process a: the operation on the computer is applied for starting, if the electric system is normal, a good signal is fed back to the operation, the operation on the computer is started immediately, the frequency conversion system works to enter the next state, namely, the subsequent state, and if the frequency conversion system is tripped immediately, the operation comprises the following steps:
step 1-1-1, checking an operation panel of a frequency conversion system, checking whether the alarm of a switch of a frequency conversion cabinet door is normal and processing, if so, turning to step 1-2-1, otherwise, turning to step 1-1-2;
step 1-1-2, checking an operation panel of the frequency conversion system, checking whether temperature and humidity detection of the frequency conversion cabinet is normal and processing, if so, turning to step 1-2-1, otherwise, turning to step 1-1-3;
step 1-1-3, checking an operation panel of the frequency conversion system, checking whether a main power supply and an auxiliary power supply of the frequency conversion cabinet are normal and processing, and if so, turning to step 1-2-1;
step 1-2-1, checking an operation panel of an excitation system, checking whether an excitation cabinet interlocking loop, namely a lubricating oil interlocking loop, a power oil interlocking loop and a top shaft system interlocking loop are normal and processing, if so, turning to step 1-3-1, otherwise, turning to step 1-2-2;
step 1-2-2, checking an operation panel of the excitation system, checking whether a PLC module of the excitation cabinet is normal and processing, if so, turning to step 1-3-1, otherwise, turning to step 1-2-3;
step 1-2-3, checking an operation panel of an excitation system, checking whether a safety relay loop of an excitation cabinet is normal and processing, and if so, turning to step 1-3-1;
Step 1-3-1, checking a main motor unit, checking whether a water leakage detection device and a loop are normal or not, and replacing, if so, turning to step 2, otherwise, turning to step 1-3-2;
step 1-3-2, checking a main motor unit, checking whether a motor winding temperature detection and air flow detection loop is normal and performing replacement processing, if so, turning to step 2, otherwise, turning to step 1-3-3;
1-3-3, checking a main motor unit, checking whether a brushless excitation circuit of the motor is normal and performing replacement processing, and if so, turning to the step 2;
And step 2, starting for 1 second, wherein the state is a starting state b: the MMIP of the interface unit of the excitation system controls the input of a protector of a frequency conversion cabinet, the input of a frequency conversion auxiliary system, an automatic switch-on frequency conversion outlet circuit breaker MBM, then an automatic switch-on frequency conversion inlet circuit breaker MBC, the frequency conversion cabinet is electrified and enters the next state, and if the circuit is immediately tripped, the operation is as follows, and the MMIP control circuit comprises the following steps:
step 2-1-1, if the alarm shows that the MBM is not switched on, checking whether a change-over switch on the high-voltage cabinet is in a remote control state or not, and processing, if so, turning to step 2-2-1, otherwise, turning to step 2-1-2;
2-1-2, if the alarm shows that the MBM does not close the switch, checking whether a switch-on motor and a switch-on electromagnet of the high-voltage cabinet are good and processing, if so, turning to the step 2-2-1, otherwise, turning to the step 2-1-3;
step 2-1-3: if the alarm shows that the MBM is not switched on or is switched off immediately after switching on, checking whether the secondary plug of the high-voltage handcart is well inserted and processing, and if so, turning to the step 2-2-1;
step 2-2-1: if the alarm shows that the system is tripped immediately after the MBC is switched on, the MBC-CHECKBACK-FAILER is displayed, whether a feedback signal is normal after the high-pressure vacuum switch acts, whether an auxiliary contact is good and whether a link mechanism is deformed and processed are checked, if so, the step 3 is turned, and if not, the step 2-2-2 is turned;
step 2-2-2: if the alarm shows that the system trips immediately after the MBC is switched on, the MBC-CHECKBACK-FAILER is displayed, whether the action time of the auxiliary contact of the high-pressure vacuum switch exceeds a set value or not is checked, the numerical value is adjusted or the handcart is pulled to a test position and is manually operated for 5-6 times, the feedback time is reduced, if yes, the step 3 is switched, and if not, the step 2-2-3 is switched;
step 2-2-3: if the alarm shows that the system is tripped immediately after the MBC is switched on, the MBC-CHECKBACK-FAILER is displayed, the action time limit of the auxiliary contact of the high-pressure vacuum switch is checked to be in a critical value, the system is restarted once again, and if the action time limit is in the critical value, the step 3 is turned to;
and 3, starting for 3 seconds, wherein the state is a starting state c, after the MBM switch and the MBC switch are switched on, the starting is mainly controlled by a frequency conversion system, the starting is started according to a fan starting torque curve, meanwhile, an excitation system gives a rectification signal and sends out excitation to increase torque at a synchronous rotating speed, and if the starting is tripped immediately, the operation is as follows, and the method comprises the following steps:
step 3-1-1, checking whether an excitation rectifying circuit is good, whether an excitation rectifying device has an alarm or not and can be reset or not, replacing a rectifying device and downloading parameters, if so, turning to step 3-2-1, otherwise, turning to step 3-1-2;
3-1-2, checking whether an excitation rectifying circuit is good, whether an excitation contactor acts reliably and whether the virtual connection is positive, if so, turning to the step 3-2-1, otherwise, turning to the step 3-1-3;
step 3-1-3: checking whether an excitation rectifying circuit is good or not, whether the excitation circuit has a short circuit or not, and removing and replacing the quick fuse, if so, turning to the step 3-2-1;
3-2-1, checking whether the frequency conversion system is normal and whether a frequency conversion device is given, replacing a connecting flat cable and a port-borrowing module from the frequency conversion control cabinet to the frequency conversion power cabinet, if so, turning to the step 4, otherwise, turning to the step 3-2-2;
3-2-2, checking whether the frequency conversion system is normal or not, checking whether the frequency conversion cabinet has abnormal smell or short-circuit smoke, checking and replacing the short-circuit damage power module and the controlled silicon, if so, turning to the step 4, otherwise, turning to the step 3-2-3;
3-2-3, checking whether the frequency conversion system is normal or not, if the frequency conversion cabinet has an overcurrent alarm, checking a triggering optical fiber interface, re-polishing an optical fiber head, or replacing a triggering plate and replacing a silicon controlled rectifier, and if so, turning to the step 4;
step 4, when the system is started for 150 seconds, the state is a starting state d, the electric system is started at a constant speed, after 1400 revolutions are reached, the motor control is controlled by a variable frequency controller, the no-load speed is accelerated to 1300 revolutions, the power reaches one hundred of 1MW, the motor speed loiters at 1400, the motor speed fluctuates greatly for many times, at the moment, a frequency conversion cabinet displays a power unit I side T to give an alarm, an excitation cabinet displays an SFC fault, and if the motor is tripped, the system is operated as follows, and comprises the following steps:
step 4-1-1 resetting and checking the ambient temperature or replacing the temperature sensing element, if yes, turning to step 5, otherwise, turning to step 4-1-2;
4-1-2, checking and reducing the load of a motor, adjusting the angle of the stator blade of the motor compressor to the minimum angle of 14 degrees, or recalibrating the angle of the stator blade to prevent zero drift and running processing, if so, turning to the step 5, otherwise, turning to the step 4-1-3;
step 4-1-3: checking and analyzing that the starting torque of the motor is slightly smaller than the mechanical torque, increasing the capacity of an electric network system, reducing the starting voltage drop, adjusting the active power of the number 1 sixty-thousand generator sets carried on the same section of high-voltage bus to 40000KVA and the reactive power to 5000KVAR, enabling the system voltage to be 10.8KV, if yes, turning to the step 5, otherwise, turning to the step 4-1-4;
step 4-1-4: starting backup allowance by using variable frequency, improving system voltage, adjusting an on-load adjusting tap of 11 thousands of main transformers to improve two gears, enabling the system voltage to reach 10.8KV, if yes, turning to the step 5, otherwise, turning to the step 4-1-5;
step 4-1-5: regulating a tap of a step-down transformer of the frequency conversion system by using the step-down variable regulation of the frequency conversion system, and if so, turning to the step 5;
Step 5, when the motor is started for 180 seconds, the state is a starting state e, the variable frequency system drags the motor to uniformly accelerate, the speed of the motor reaches 1480 revolutions, the variable frequency starting main controller is switched from the main control in the variable frequency cabinet to the control in the excitation cabinet to enter the quasi-synchronous control, the grid connection cannot be carried out after the delay, if the system is tripped immediately, the operation is composed of the following sub-steps:
step 5-1-1, checking and observing panel indicator lights of the synchronous devices, if two synchronous conditions of frequency and phase angle cannot be met, replacing synchronous spare parts, downloading software and calibrating, if yes, turning to step 6, otherwise, turning to step 5-1-2;
step 5-1-2, checking and observing a synchronous indicator light of a device panel, if the frequency and the phase angle are met, and if the synchronous condition of the voltage cannot be met, the system voltage is not matched, adjusting the active power of the same bus generator to 38000KVA and the reactive power to 4000KVAR, and if the system voltage is not higher than 10.9KV, turning to step 6;
step 6, operating state f after grid connection: 2 seconds after grid connection, at the moment, after an electric system drags a motor to reach synchronous rotating speed and grid connection is successful, a frequency conversion cabinet automatically exits, a high-voltage switch MBL is switched on, high-voltage switches MBM and MBC exit, the control is switched to an excitation system, the motor synchronously operates, and before process loading, if step-out tripping is prevented, the operation is as follows:
Checking whether the load of the motor is increased unstably, the motor is in a critical state, the reactive power is changed into the reactive power absorption state from the reactive power emission state, and the motor works at an unstable working point, operating and adjusting the set power factor, and adjusting the set power factor value from 0.99 to 0.97 in advance;
and 7: and (6) ending. .
according to this operating method, the time to failure can be reduced by 24 hours throughout the year, i.e. 1 day, reducing the losses caused: yield 4000 tons per day 1=4000 tons, with 300 yuan per ton of steel profit. The profit loss is reduced by 120 ten thousand yuan, so the method has extremely high popularization and application values.
Claims (3)
1. An operation method for searching and rapidly processing high-voltage variable-frequency starting faults according to time sequence is characterized in that: according to the time sequence characteristics of high-voltage frequency conversion starting, a plurality of time points of common faults are analyzed, and then the targeted operation of the time points is carried out.
2. the method of claim 1, wherein the method comprises the steps of: the time points of the common faults are six, and the six time points are respectively six time points of zero-second preparation for variable frequency starting, one second starting for the variable frequency starting, three seconds starting, one hundred fifty seconds for the variable frequency starting, one hundred eighty seconds for the variable frequency starting and two seconds after grid connection.
3. the operation method for searching and rapidly processing the high-voltage variable-frequency starting fault according to the time sequence as claimed in claim 2, is characterized by comprising the following specific steps:
Step 1: at 0 second of start-up, the state is start-up process a: the operation on the computer is applied for starting, if the electric system is normal, a good signal is fed back to the operation, the operation on the computer is started immediately, the frequency conversion system works to enter the next state, namely, the subsequent state, and if the frequency conversion system is tripped immediately, the operation comprises the following steps:
Step 1-1-1, checking an operation panel of a frequency conversion system, checking whether the alarm of a switch of a frequency conversion cabinet door is normal and processing, if so, turning to step 1-2-1, otherwise, turning to step 1-1-2;
step 1-1-2, checking an operation panel of the frequency conversion system, checking whether temperature and humidity detection of the frequency conversion cabinet is normal and processing, if so, turning to step 1-2-1, otherwise, turning to step 1-1-3;
step 1-1-3, checking an operation panel of the frequency conversion system, checking whether a main power supply and an auxiliary power supply of the frequency conversion cabinet are normal and processing, and if so, turning to step 1-2-1;
step 1-2-1, checking an operation panel of an excitation system, checking whether an excitation cabinet interlocking loop, namely a lubricating oil interlocking loop, a power oil interlocking loop and a top shaft system interlocking loop are normal and processing, if so, turning to step 1-3-1, otherwise, turning to step 1-2-2;
step 1-2-2, checking an operation panel of the excitation system, checking whether a PLC module of the excitation cabinet is normal and processing, if so, turning to step 1-3-1, otherwise, turning to step 1-2-3;
step 1-2-3, checking an operation panel of an excitation system, checking whether a safety relay loop of an excitation cabinet is normal and processing, and if so, turning to step 1-3-1;
step 1-3-1, checking a main motor unit, checking whether a water leakage detection device and a loop are normal or not, and replacing, if so, turning to step 2, otherwise, turning to step 1-3-2;
step 1-3-2, checking a main motor unit, checking whether a motor winding temperature detection and air flow detection loop is normal and performing replacement processing, if so, turning to step 2, otherwise, turning to step 1-3-3;
1-3-3, checking a main motor unit, checking whether a brushless excitation circuit of the motor is normal and performing replacement processing, and if so, turning to the step 2;
and step 2, starting for 1 second, wherein the state is a starting state b: the MMIP of the interface unit of the excitation system controls the input of a protector of a frequency conversion cabinet, the input of a frequency conversion auxiliary system, an automatic switch-on frequency conversion outlet circuit breaker MBM, then an automatic switch-on frequency conversion inlet circuit breaker MBC, the frequency conversion cabinet is electrified and enters the next state, and if the circuit is immediately tripped, the operation is as follows, and the MMIP control circuit comprises the following steps:
step 2-1-1, if the alarm shows that the MBM is not switched on, checking whether a change-over switch on the high-voltage cabinet is in a remote control state or not, and processing, if so, turning to step 2-2-1, otherwise, turning to step 2-1-2;
2-1-2, if the alarm shows that the MBM does not close the switch, checking whether a switch-on motor and a switch-on electromagnet of the high-voltage cabinet are good and processing, if so, turning to the step 2-2-1, otherwise, turning to the step 2-1-3;
step 2-1-3: if the alarm shows that the MBM is not switched on or is switched off immediately after switching on, checking whether the secondary plug of the high-voltage handcart is well inserted and processing, and if so, turning to the step 2-2-1;
step 2-2-1: if the alarm shows that the system is tripped immediately after the MBC is switched on, the MBC-CHECKBACK-FAILER is displayed, whether a feedback signal is normal after the high-pressure vacuum switch acts, whether an auxiliary contact is good and whether a link mechanism is deformed and processed are checked, if so, the step 3 is turned, and if not, the step 2-2-2 is turned;
step 2-2-2: if the alarm shows that the system trips immediately after the MBC is switched on, the MBC-CHECKBACK-FAILER is displayed, whether the action time of the auxiliary contact of the high-pressure vacuum switch exceeds a set value or not is checked, the numerical value is adjusted or the handcart is pulled to a test position and is manually operated for 5-6 times, the feedback time is reduced, if yes, the step 3 is switched, and if not, the step 2-2-3 is switched;
step 2-2-3: if the alarm shows that the system is tripped immediately after the MBC is switched on, the MBC-CHECKBACK-FAILER is displayed, the action time limit of the auxiliary contact of the high-pressure vacuum switch is checked to be in a critical value, the system is restarted once again, and if the action time limit is in the critical value, the step 3 is turned to;
and 3, starting for 3 seconds, wherein the state is a starting state c, after the MBM switch and the MBC switch are switched on, the starting is mainly controlled by a frequency conversion system, the starting is started according to a fan starting torque curve, meanwhile, an excitation system gives a rectification signal and sends out excitation to increase torque at a synchronous rotating speed, and if the starting is tripped immediately, the operation is as follows, and the method comprises the following steps:
step 3-1-1, checking whether an excitation rectifying circuit is good, whether an excitation rectifying device has an alarm or not and can be reset or not, replacing a rectifying device and downloading parameters, if so, turning to step 3-2-1, otherwise, turning to step 3-1-2;
3-1-2, checking whether an excitation rectifying circuit is good, whether an excitation contactor acts reliably and whether the virtual connection is positive, if so, turning to the step 3-2-1, otherwise, turning to the step 3-1-3;
step 3-1-3: checking whether an excitation rectifying circuit is good or not, whether the excitation circuit has a short circuit or not, and removing and replacing the quick fuse, if so, turning to the step 3-2-1;
3-2-1, checking whether the frequency conversion system is normal and whether a frequency conversion device is given, replacing a connecting flat cable and a port-borrowing module from the frequency conversion control cabinet to the frequency conversion power cabinet, if so, turning to the step 4, otherwise, turning to the step 3-2-2;
3-2-2, checking whether the frequency conversion system is normal or not, checking whether the frequency conversion cabinet has abnormal smell or short-circuit smoke, checking and replacing the short-circuit damage power module and the controlled silicon, if so, turning to the step 4, otherwise, turning to the step 3-2-3;
3-2-3, checking whether the frequency conversion system is normal or not, if the frequency conversion cabinet has an overcurrent alarm, checking a triggering optical fiber interface, re-polishing an optical fiber head, or replacing a triggering plate and replacing a silicon controlled rectifier, and if so, turning to the step 4;
step 4, when the system is started for 150 seconds, the state is a starting state d, the electric system is started at a constant speed, after 1400 revolutions are reached, the motor control is controlled by a variable frequency controller, the no-load speed is accelerated to 1300 revolutions, the power reaches one hundred of 1MW, the motor speed loiters at 1400, the motor speed fluctuates greatly for many times, at the moment, a frequency conversion cabinet displays a power unit I side T to give an alarm, an excitation cabinet displays an SFC fault, and if the motor is tripped, the system is operated as follows, and comprises the following steps:
step 4-1-1 resetting and checking the ambient temperature or replacing the temperature sensing element, if yes, turning to step 5, otherwise, turning to step 4-1-2;
4-1-2, checking and reducing the load of a motor, adjusting the angle of the stator blade of the motor compressor to the minimum angle of 14 degrees, or recalibrating the angle of the stator blade to prevent zero drift and running processing, if so, turning to the step 5, otherwise, turning to the step 4-1-3;
step 4-1-3: checking and analyzing that the starting torque of the motor is slightly smaller than the mechanical torque, increasing the capacity of an electric network system, reducing the starting voltage drop, adjusting the active power of the number 1 sixty-thousand generator sets carried on the same section of high-voltage bus to 40000KVA and the reactive power to 5000KVAR, enabling the system voltage to be 10.8KV, if yes, turning to the step 5, otherwise, turning to the step 4-1-4;
Step 4-1-4: starting backup allowance by using variable frequency, improving system voltage, adjusting an on-load adjusting tap of 11 thousands of main transformers to improve two gears, enabling the system voltage to reach 10.8KV, if yes, turning to the step 5, otherwise, turning to the step 4-1-5;
step 4-1-5: regulating a tap of a step-down transformer of the frequency conversion system by using the step-down variable regulation of the frequency conversion system, and if so, turning to the step 5;
step 5, when the motor is started for 180 seconds, the state is a starting state e, the variable frequency system drags the motor to uniformly accelerate, the speed of the motor reaches 1480 revolutions, the variable frequency starting main controller is switched from the main control in the variable frequency cabinet to the control in the excitation cabinet to enter the quasi-synchronous control, the grid connection cannot be carried out after the delay, if the system is tripped immediately, the operation is composed of the following sub-steps:
step 5-1-1, checking and observing panel indicator lights of the synchronous devices, if two synchronous conditions of frequency and phase angle cannot be met, replacing synchronous spare parts, downloading software and calibrating, if yes, turning to step 6, otherwise, turning to step 5-1-2;
step 5-1-2, checking and observing a synchronous indicator light of a device panel, if the frequency and the phase angle are met, and if the synchronous condition of the voltage cannot be met, the system voltage is not matched, adjusting the active power of the same bus generator to 38000KVA and the reactive power to 4000KVAR, and if the system voltage is not higher than 10.9KV, turning to step 6;
step 6, operating state f after grid connection: 2 seconds after grid connection, at the moment, after an electric system drags a motor to reach synchronous rotating speed and grid connection is successful, a frequency conversion cabinet automatically exits, a high-voltage switch MBL is switched on, high-voltage switches MBM and MBC exit, the control is switched to an excitation system, the motor synchronously operates, and before process loading, if step-out tripping is prevented, the operation is as follows:
checking whether the load of the motor is increased unstably, the motor is in a critical state, the reactive power is changed into the reactive power absorption state from the reactive power emission state, and the motor works at an unstable working point, operating and adjusting the set power factor, and adjusting the set power factor value from 0.99 to 0.97 in advance;
And 7: and (6) ending.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111424454A (en) * | 2019-11-06 | 2020-07-17 | 福建省青山纸业股份有限公司 | Control method for frequency conversion adjustment of causticized green liquor system |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4723189A (en) * | 1986-12-23 | 1988-02-02 | General Electric Company | Negative sequence detector for a continuous wave frequency transducer |
| CN1744419A (en) * | 2005-09-29 | 2006-03-08 | 北京金自天正智能控制股份有限公司 | Monitoring system for capcade multi-level high-voltage frequency transfomrer power unit |
| CN101819430A (en) * | 2010-01-28 | 2010-09-01 | 中电电气(江苏)股份有限公司 | Fault signal processing system of high-voltage frequency converter controller and working method thereof |
| CN202171642U (en) * | 2011-08-11 | 2012-03-21 | 哈尔滨九洲电气股份有限公司 | High pressure frequency converter monitoring system testing apparatus |
| CN103078483A (en) * | 2011-10-26 | 2013-05-01 | 乐星产电(无锡)有限公司 | High-voltage inverter device and control method thereof |
| CN104135143A (en) * | 2014-07-25 | 2014-11-05 | 内蒙古包钢钢联股份有限公司 | Fault removal operating method for high-voltage frequency converter |
| CN106338669A (en) * | 2016-09-22 | 2017-01-18 | 全球能源互联网研究院 | Variable frequency speed governor electric energy quality characteristic test cabinet, test system and test method thereof |
| CN106410646A (en) * | 2016-11-07 | 2017-02-15 | 河钢股份有限公司邯郸分公司 | Fault rapid determining and processing operation method of AC-DC-AC high-voltage frequency converter |
| CN206726084U (en) * | 2017-03-28 | 2017-12-08 | 邯郸钢铁集团有限责任公司 | A kind of solenoid valve control loop fast detector |
| CN109586192A (en) * | 2017-09-29 | 2019-04-05 | 毛运蓉 | A kind of failure of high-voltage large current high-intensity magnetic field frequency converter quickly judges and processing method |
| CN109633365A (en) * | 2017-10-06 | 2019-04-16 | 镇江长河电力技术有限公司 | A kind of convenient and fast frequency conversion electric wire cable fault high voltage testing device |
-
2019
- 2019-07-31 CN CN201910701726.0A patent/CN110567740B/en not_active Expired - Fee Related
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4723189A (en) * | 1986-12-23 | 1988-02-02 | General Electric Company | Negative sequence detector for a continuous wave frequency transducer |
| CN1744419A (en) * | 2005-09-29 | 2006-03-08 | 北京金自天正智能控制股份有限公司 | Monitoring system for capcade multi-level high-voltage frequency transfomrer power unit |
| CN101819430A (en) * | 2010-01-28 | 2010-09-01 | 中电电气(江苏)股份有限公司 | Fault signal processing system of high-voltage frequency converter controller and working method thereof |
| CN202171642U (en) * | 2011-08-11 | 2012-03-21 | 哈尔滨九洲电气股份有限公司 | High pressure frequency converter monitoring system testing apparatus |
| CN103078483A (en) * | 2011-10-26 | 2013-05-01 | 乐星产电(无锡)有限公司 | High-voltage inverter device and control method thereof |
| CN104135143A (en) * | 2014-07-25 | 2014-11-05 | 内蒙古包钢钢联股份有限公司 | Fault removal operating method for high-voltage frequency converter |
| CN106338669A (en) * | 2016-09-22 | 2017-01-18 | 全球能源互联网研究院 | Variable frequency speed governor electric energy quality characteristic test cabinet, test system and test method thereof |
| CN106410646A (en) * | 2016-11-07 | 2017-02-15 | 河钢股份有限公司邯郸分公司 | Fault rapid determining and processing operation method of AC-DC-AC high-voltage frequency converter |
| CN206726084U (en) * | 2017-03-28 | 2017-12-08 | 邯郸钢铁集团有限责任公司 | A kind of solenoid valve control loop fast detector |
| CN109586192A (en) * | 2017-09-29 | 2019-04-05 | 毛运蓉 | A kind of failure of high-voltage large current high-intensity magnetic field frequency converter quickly judges and processing method |
| CN109633365A (en) * | 2017-10-06 | 2019-04-16 | 镇江长河电力技术有限公司 | A kind of convenient and fast frequency conversion electric wire cable fault high voltage testing device |
Non-Patent Citations (1)
| Title |
|---|
| 钟亮 等: "高压变频装置突发停机故障分析", 《吉林水利》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111424454A (en) * | 2019-11-06 | 2020-07-17 | 福建省青山纸业股份有限公司 | Control method for frequency conversion adjustment of causticized green liquor system |
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