CN114421825B - Logic control method and storage medium for series autotransformer starting motor - Google Patents
Logic control method and storage medium for series autotransformer starting motor Download PDFInfo
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- CN114421825B CN114421825B CN202210054281.3A CN202210054281A CN114421825B CN 114421825 B CN114421825 B CN 114421825B CN 202210054281 A CN202210054281 A CN 202210054281A CN 114421825 B CN114421825 B CN 114421825B
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- 238000012360 testing method Methods 0.000 claims description 9
- 238000004590 computer program Methods 0.000 claims description 3
- 239000007858 starting material Substances 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 10
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- 238000013461 design Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/20—Arrangements for starting
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/24—Arrangements for stopping
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Abstract
A logic control method and storage medium of a series autotransformer starting motor judges whether a triggering condition of an electric control normal signal is met according to a breaker signal; triggering a first starting command according to an electric control normal signal and a switching signal to enable the star point breaker 3QF to be switched on; triggering a second starting command according to the first starting command and the breaker signal to enable the running breaker 1QF to be switched on; judging whether a trigger condition of a starting timeout signal is met or not according to the first starting command and the breaker signal; according to the first starting command, the breaker signal and the motor current signal, or the breaker signal, the star point breaker 3QF is opened; according to the first starting command, the breaker signal and the motor current signal, the bypass breaker 2QF is switched on; according to the breaker signal, or starting overtime signal, or switching signal, the running breaker 1QF is opened; and according to the breaker signal, starting the motor is finished. The invention simplifies the interlocking wiring and realizes the intrinsic safety of omnibearing electrical protection.
Description
Technical Field
The invention relates to the technical field of alternating current motors, in particular to a logic control method and a storage medium of a series autotransformer starting motor.
Background
With the development of national economy, the number of high-voltage large-capacity motors used in various industries is increased, and large current generated by direct starting of the high-voltage super-large-capacity motors causes great harm to a power grid, the motors and the like.
The existing high-voltage cabinet series connection autotransformer starting mode is to cut off or drop off the autotransformer at regular time and then run at full voltage, the two cutting modes easily cause that the starting current does not drop to the rated value, the autotransformer is cut off, the impact of the starting current on a power grid is caused, and the system voltage is pulled down, so that other running equipment trips at low voltage.
As shown in fig. 1, a primary system diagram of a motor series autotransformer comprises a running breaker 1QF in a running cabinet, a bypass breaker 2QF in a bypass cabinet, a star point breaker 3QF in a star point cabinet, an autotransformer AT, a motor M and a grounding switch QS, wherein the work of the motor is controlled through a start and stop button, when the running breaker 1QF and the star point breaker 3QF are closed, the series autotransformer AT steps down and starts the motor M, and when the running breaker 1QF and the bypass breaker 2QF are closed, the autotransformer AT is cut off to perform full-voltage operation on the motor M. The position signals of the existing three circuit breakers, namely the running circuit breaker 1QF, the bypass circuit breaker 2QF and the star point circuit breaker 3QF, are not involved in logic control, misoperation is easy to cause, the traditional interlocking hard wiring is complex, the number of fault points is large, the electric protection cannot be fully involved and the circuit breaker refusal protection is not caused, the light equipment is seriously heated, insulation is damaged, and the heavy equipment causes short-circuit accidents.
Disclosure of Invention
In order to solve the problems, the technical scheme provided by the invention is as follows:
a logic control method of a series autotransformer starting motor is characterized in that a breaker signal, a switch signal and a motor current signal are obtained;
judging whether triggering conditions of the electric control normal signals are met or not according to the breaker signals;
triggering a first starting command according to an electric control normal signal and a switching signal to enable the star point breaker 3QF to be switched on;
triggering a second starting command according to the first starting command and the breaker signal to enable the running breaker 1QF to be switched on;
judging whether a trigger condition of a starting timeout signal is met or not according to the first starting command and the breaker signal;
according to the first starting command, the breaker signal and the motor current signal, or according to the breaker signal, the star point breaker 3QF is opened;
according to the first starting command, the breaker signal and the motor current signal, the bypass breaker 2QF is switched on;
according to the breaker signal, or according to the starting overtime signal, or according to the switch signal, the running breaker 1QF is opened;
and according to the breaker signal, starting the motor is finished.
The invention is further arranged that the breaker signals comprise test position signals, working position signals, spring non-energy storage signals, closing state signals, opening state signals and grounding knife closing state signals of three breakers of the running breaker 1QF, the bypass breaker 2QF and the star point breaker 3QF, and the switch signals comprise a stopping signal and a starting signal.
The trigger condition of the electric control normal signal is that three breakers of an operating breaker 1QF, a bypass breaker 2QF and a star point breaker 3QF are all in a test position or a working position, the three breakers of the operating breaker 1QF, the bypass breaker 2QF and the star point breaker 3QF are all in a brake-separating state, springs of the three breakers of the operating breaker 1QF, the bypass breaker 2QF and the star point breaker 3QF are all stored, and a grounding knife of the operating breaker 1QF is in the brake-separating state; the condition for ending the motor starting is that the running breaker 1QF and the bypass breaker 2QF are both in a closing state.
The triggering condition of the electric control normal signal is harsh, three breakers are required to be ensured to be simultaneously in a test position or a working position and are in a brake-separating and spring energy storage state, and the grounding knife for running the breaker 1QF is separated, and the automatic detection before the motor is started can be realized by logic operation of an AND gate, so that the motor can be safely started.
The invention further sets that the triggering condition of the first starting command is that the electric control normal signal triggers and the starting signal is received.
On the premise of normal electric control, a starting signal is input to trigger the starting of the motor.
The invention further provides that the triggering condition of the second starting command is that the first starting command is received and the star point breaker 3QF is in a closing state.
The above-mentioned switching-on of the running breaker 1QF in the starting process must be carried out under the state that the star point breaker 3QF is in the switching-on, realize the interlocking of the sequential switching-on sequence of running breaker 1QF and star point breaker 3QF, guarantee the motor to start in a falling current.
The invention is further arranged such that the triggering condition of the start timeout signal comprises:
setting a reset priority RS trigger;
the first starting command and a closing state signal of the running breaker 1QF are input to a setting end of a reset priority RS trigger after AND gate logic operation;
the switching-off state signal of the operating breaker 1QF and the switching-on state signal of the bypass breaker 2QF are input to a reset end of a reset priority RS trigger after OR gate logic operation;
and carrying out power-on delay on an output signal of the output end of the reset priority RS trigger to trigger a starting overtime signal.
The time counting of the starting overtime is triggered only after the first starting command and the closing state signal of the operating breaker 1QF are received, and the time counting of the starting overtime is initialized to be zero after any one of the opening state signal of the operating breaker 1QF and the closing state signal of the bypass breaker 2QF is received.
The invention further provides that the star point breaker 3QF opening can be triggered when any one of the following conditions is met:
(1) Judging whether the collected motor current falls below the rated current of the motor to be used as a motor current signal, carrying out power-on delay on an output signal of an output end of a reset priority RS trigger, carrying out AND gate logic operation on the output signal and the motor current signal, and outputting a first opening signal of the star point breaker 3 QF;
(2) The switching-on state signal of the running breaker 1QF and the switching-on state signal of the star point breaker 3QF are subjected to AND gate logic operation and then subjected to power-off delay, and then the switching-on state signal of the running breaker 1QF and the switching-off state signal of the star point breaker 3QF are subjected to AND gate logic operation, so that a second switching-off signal of the star point breaker 3QF is output.
The star point breaker 3QF is switched off under two conditions, wherein the first condition is that under the normal starting of a motor, when the running breaker 1QF and the star point breaker 3QF are switched on, and the motor current is reduced below the rated current of the motor, the star point breaker 3QF is switched off, and the series autotransformer is cut off; the second is that under the abnormal starting of the motor, after the running breaker 1QF and the star point breaker 3QF are both switched on, the running breaker 1QF is switched off due to failure, and the star point breaker 3QF is immediately linked with the running breaker 1QF to switch off.
The invention further provides that the bypass breaker 2QF is switched on, and the bypass breaker 2QF is switched on after the following conditions are simultaneously met at first:
(1) Acquiring a first opening signal of the star point breaker 3 QF;
(2) The running breaker 1QF is in a closing state;
(3) The bypass breaker 2QF is in a switching-off state;
(4) The star point breaker 3QF is in the open state.
The conditions which need to be met when the bypass breaker 2QF is switched on under the normal starting of the motor are that after the star point breaker 3QF is normally switched off in the starting process, the operating breaker 1QF is in a switching-on state, the bypass breaker 2QF is in a switching-off state, the star point breaker 3QF is in a switching-on state, the bypass breaker 2QF can be switched on, at the moment, the operating breaker 1QF and the bypass breaker 2QF are switched on, and the motor is in a full-voltage operating state.
The invention further provides that the operation breaker 1QF opening can be triggered when any one of the following conditions is met:
(1) Firstly, performing AND gate logic operation on a closing state signal of an operating breaker 1QF and a closing state signal of a star point breaker 3QF, then performing power-off delay, performing AND gate logic operation on a switching-off state signal of the star point breaker 3QF, performing power-on delay, and finally performing AND gate logic operation on a switching-off state signal of a bypass breaker 2QF, and outputting a first switching-off signal of the operating breaker 1 QF;
(2) Acquiring a starting timeout signal and outputting a second brake separating signal of the running breaker 1 QF;
(3) The switching-on state signal of the bypass breaker 2QF is subjected to power-off delay, and then AND gate logic operation is carried out on the switching-on state signal of the operating breaker 1QF and the switching-off state signal of the bypass breaker 2QF, so that a third switching-off signal of the operating breaker 1QF is output;
(4) And obtaining a parking signal and outputting a fourth brake-separating signal of the running breaker 1 QF.
Four conditions exist for the operation breaker 1QF opening, wherein the first condition is that the bypass breaker 2QF refuses to operate, and after the star point breaker 3QF is normally opened in the starting process, the bypass breaker 2QF is not closed in a specified time; the second is that the starting time-out, starting timing after receiving the first starting command, and the motor is not started normally within a set time; the third is that the bypass breaker 2QF is switched on and then breaks out of the gate after the start is completed, and the operating breaker 1QF breaks out of the gate along with the break out of the gate of the bypass breaker 2 QF; the fourth is to receive a stop signal to open the operating breaker 1 QF.
A logic control method for a series autotransformer starting motor obtains a breaker signal, a switch signal, a motor current signal and an electrical protection signal;
judging whether triggering conditions of the electric control normal signals are met or not according to the breaker signals and the electric protection signals;
triggering a first starting command according to an electric control normal signal and a switching signal to enable the star point breaker 3QF to be switched on;
triggering a second starting command according to the first starting command and the breaker signal to enable the running breaker 1QF to be switched on;
judging whether a trigger condition of a starting timeout signal is met or not according to the first starting command and the breaker signal;
according to the first starting command, the breaker signal and the motor current signal, or according to the breaker signal, the star point breaker 3QF is opened;
according to the first starting command, the breaker signal and the motor current signal, the bypass breaker 2QF is switched on;
according to the breaker signal, or according to the starting overtime signal, or according to the switch signal, the running breaker 1QF is opened;
starting the motor according to the signal of the circuit breaker;
judging whether the motor is allowed to be loaded or not according to the breaker signal and the motor current signal;
the operating circuit breaker 1QF is opened in accordance with the circuit breaker signal and the electrical protection signal, or in accordance with the electrical protection signal.
The logic control of the series autotransformer starting motor further combines the electric protection signals, and the backup protection tripping and differential protection tripping signals are interlocked, so that the triggering condition of the electric control normal signal is further required, and the full interlocking protection of the series autotransformer starting motor is realized.
A computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the logic control method of a series autotransformed start motor described above.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
the logic control method of the invention logically correlates the running breaker 1QF, the bypass breaker 2QF and the star point breaker 3QF of each starting stage according to the action sequence of three breakers in the actual starting process of the series autotransformed starting motor, and is used as the condition for allowing the running cabinet, the bypass cabinet and the star point cabinet to be closed, and the switching time and the limitation of the motor current of each cabinet body are also logically controlled, thus not only perfecting the system control of the bottom layer, but also realizing the omnidirectional electrical protection and the intrinsic safety of the electrical operation.
The logic control method of the series autotransformer starting motor carries out logic control on the position signals and the state signals of the three circuit breakers, and correlates with the electric protection signals, thereby greatly simplifying the complexity of hard interlocking wiring, reducing the fault risk caused by actual wiring, and being reasonable in design and suitable for being widely popularized and used.
Drawings
FIG. 1 is a system diagram of an embodiment of the present invention.
FIG. 2 is a logic control diagram of a first portion of embodiment 1 of the present invention.
FIG. 3 is a logic control diagram of a second portion of embodiment 1 of the present invention.
FIG. 4 is a diagram showing the overall logic control according to embodiment 1 of the present invention.
FIG. 5 is a logic control diagram of a first portion of embodiment 2 of the present invention.
FIG. 6 is a logic control diagram of a second portion of embodiment 2 of the present invention.
FIG. 7 is a logic control diagram of a third portion of embodiment 2 of the present invention.
FIG. 8 is a diagram showing the overall logic control according to embodiment 2 of the present invention.
Detailed Description
For a further understanding of the present invention, the present invention will be described in detail with reference to the drawings and examples.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, integrally connected, or detachably connected; can be mechanical connection or electric connection, or can be communication between two elements; may be directly connected or indirectly connected through an intermediate medium, and the specific meaning of the above terms will be understood by those skilled in the art according to the specific circumstances.
Example 1
With reference to fig. 1, a primary system diagram of a series autotransformer of a motor in this embodiment includes an operating breaker 1QF in an operating cabinet, a bypass breaker 2QF in a bypass cabinet, a star point breaker 3QF in a star point cabinet, an autotransformer AT, a motor M and a grounding switch QS, wherein the operation of the motor is controlled by a start and stop button, when the operating breaker 1QF and the star point breaker 3QF are closed, the series autotransformer AT steps down and starts the motor M, and when the operating breaker 1QF and the bypass breaker 2QF are closed, the autotransformer AT is cut off to perform full-voltage operation on the motor M.
With reference to fig. 2 to 4, it should be noted that the digital identifications 1 to 9 in fig. 2 are correspondingly connected with the digital identifications 1 to 9 in fig. 2, and the technical scheme of the invention is a logic control method of a series autotransformer starting motor, which obtains a circuit breaker signal, a switching signal and a motor current signal;
judging whether triggering conditions of the electric control normal signals are met or not according to the breaker signals;
triggering a first starting command according to an electric control normal signal and a switching signal to enable the star point breaker 3QF to be switched on;
triggering a second starting command according to the first starting command and the breaker signal to enable the running breaker 1QF to be switched on;
judging whether a trigger condition of a starting timeout signal is met or not according to the first starting command and the breaker signal;
according to the first starting command, the breaker signal and the motor current signal, or according to the breaker signal, the star point breaker 3QF is opened;
according to the first starting command, the breaker signal and the motor current signal, the bypass breaker 2QF is switched on;
according to the breaker signal, or according to the starting overtime signal, or according to the switch signal, the running breaker 1QF is opened;
and according to the breaker signal, starting the motor is finished.
In this embodiment, the breaker signals include a test position signal of the operating breaker 1QF, a test position signal of the bypass breaker 2QF, a test position signal of the star point breaker 3QF, an operating position signal of the operating breaker 1QF, an operating position signal of the bypass breaker 2QF, an operating position signal of the star point breaker 3QF, a spring-stored-energy signal of the operating breaker 1QF, a spring-stored-energy signal of the bypass breaker 2QF, a spring-stored-energy signal of the star point breaker 3QF, a closing state signal of the operating breaker 1QF, a closing state signal of the bypass breaker 2QF, a closing state signal of the star point breaker 3QF, a opening state signal of the operating breaker 1QF, a opening state signal of the bypass breaker 2QF, a closing state signal of the star point breaker 3QF, and a closing state signal of the ground knife of the operating breaker 1 QF. In further embodiments, the spring-stored-energy-free signal of the operating breaker 1QF, the spring-stored-energy-free signal of the bypass breaker 2QF, the spring-stored-energy-free signal of the star point breaker 3QF may also be the spring-stored-energy signal of the operating breaker 1QF, the spring-stored-energy signal of the bypass breaker 2QF, the spring-stored-energy signal of the star point breaker 3 QF.
In this embodiment, the switching signals include a stop signal and a start signal.
In this embodiment, the triggering condition of the electric control normal signal is that three breakers of the operating breaker 1QF, the bypass breaker 2QF and the star point breaker 3QF are all in a test position or a working position, the three breakers of the operating breaker 1QF, the bypass breaker 2QF and the star point breaker 3QF are all in a breaking state, springs of the three breakers of the operating breaker 1QF, the bypass breaker 2QF and the star point breaker 3QF are all stored energy, and a grounding knife of the operating breaker 1QF is in a breaking state; the condition for ending the motor starting is that the running breaker 1QF and the bypass breaker 2QF are both in a closing state. The motor can be automatically detected before starting by AND gate logic operation, and the motor can be safely started.
In this embodiment, the triggering condition of the first start command is that the electronic control normal signal triggers and the start signal is received, and the specific logic association is: the first start command, the NOT gate of the stop signal and the start signal are logically operated by the AND gate, so that the first start command needs to be input into 1, the stop signal is input into 0 and the start signal is input into 1 when the first start command is triggered, and a pulse signal is sent out for 2 seconds after the first start command is triggered, so that the star point breaker 3QF is switched on.
In this embodiment, the triggering condition of the second start command is that the first start command is received and the star point breaker 3QF is in a closing state, and the specific logic is that: when the first starting command is input into 1, a first delay breaking timer is triggered for 3 seconds, the output of the first delay breaking timer and a closing signal of the star point breaker 3QF are subjected to AND gate logic operation, the output of AND gate operation triggers a first delay closing timer for 1 second, and the first delay closing timer outputs a pulse signal for 2 seconds, so that the running breaker 1QF is closed.
In this embodiment, the trigger condition logic of the start timeout signal is to set a first reset priority RS trigger;
the output of the first delay break timer and a closing state signal of the running breaker 1QF are input to a setting end of a first reset priority RS trigger after AND gate logic operation;
the method comprises the steps of performing OR gate logic operation on a switching-off state signal of an operating breaker 1QF and a switching-on state signal of a bypass breaker 2QF, and then inputting the switching-on state signal and the switching-off state signal to a reset end of a first reset priority RS trigger;
the output of the first reset priority RS flip-flop triggers a 40 second delay closure timer to trigger a start timeout signal. By setting the first reset priority RS trigger, the time counting of starting overtime is triggered only after the first starting command and the closing state signal of the operating breaker 1QF are received, and the time counting of starting overtime is initialized to be zero after any one of the opening state signal of the operating breaker 1QF and the closing state signal of the bypass breaker 2QF is received.
In this embodiment, the star point breaker 3QF opening can be triggered when any one of the following conditions is satisfied:
(1) Judging whether the collected motor current falls below the rated current of the motor to be used as a motor current signal, triggering a third delay closing timer for 5 seconds by the output of a first reset priority RS trigger, performing AND gate logic operation on the output of the third delay closing timer and the motor current signal, and outputting a star point breaker 3QF first opening signal by the AND gate operation; the first brake-separating signal of the star point breaker 3QF is the brake-separating signal of the star point breaker 3QF in the normal starting process of the motor;
(2) Firstly, the closing state signal of the running breaker 1QF and the closing state signal of the star point breaker 3QF are subjected to AND gate logic operation, and then a second delay breaking timer is triggered for 2 seconds, the output of the second delay breaking timer and the opening state signal of the running breaker 1QF are subjected to AND gate logic operation, and the AND gate operation outputs a star point breaker 3QF second opening signal; the star point breaker 3QF second brake separating signal is the brake separating of the star point breaker 3QF in the abnormal starting process of the motor, and the specific reason is that the running breaker 1QF is converted from a closing state to a brake separating state in the starting process, so that the star point breaker 3QF performs interlocking brake separating.
In this embodiment, the bypass breaker 2QF is closed first by satisfying the following conditions simultaneously:
(1) Acquiring a first opening signal of the star point breaker 3 QF;
(2) The running breaker 1QF is in a closing state;
(3) The bypass breaker 2QF is in a switching-off state;
(4) The star point breaker 3QF is in a brake-separating state;
the specific logic is as follows: triggering a third delay breaking timer for 3 seconds by using a first breaking signal of the star point breaker 3QF, and performing AND gate logic operation on the output of the third delay breaking timer, a closing state signal of the running breaker 1QF, a breaking state signal of the bypass breaker 2QF and a breaking state signal of the star point breaker 3QF, wherein the AND gate operation output triggers a fourth delay closing timer for 1 second, and the fourth delay closing timer outputs a pulse signal for 2 seconds to enable the bypass breaker 2QF to be closed.
In this embodiment, the operation breaker 1QF opening can be triggered when any one of the following conditions is satisfied:
(1) Firstly, performing AND gate logic operation on a closing state signal of an operating breaker 1QF and a closing state signal of a star point breaker 3QF, then performing power-off delay, performing AND gate logic operation on a switching-off state signal of the star point breaker 3QF, performing power-on delay, and finally performing AND gate logic operation on a switching-off state signal of a bypass breaker 2QF, and outputting a first switching-off signal of the operating breaker 1 QF; the specific logic is as follows: triggering a fourth delay breaking timer for 2.5 seconds after the closing state signal of the running breaker 1QF and the closing state signal of the star point breaker 3QF are subjected to AND gate logic operation, wherein the output of the fourth delay breaking timer and the opening state signal of the star point breaker 3QF are subjected to AND gate logic operation, the AND gate logic operation triggers a fifth delay closing timer for 2 seconds, the fifth delay closing timer and the opening state signal of the bypass breaker 2QF are subjected to AND gate logic operation, and the AND gate logic operation outputs a first opening signal of the running breaker 1 QF; the first opening signal of the operating breaker 1QF is due to the refusal of the bypass breaker 2QF during starting;
(2) Acquiring a starting timeout signal and outputting a second brake separating signal of the running breaker 1 QF; the specific logic is as follows: when the starting timeout signal is output as 1, the second switching-off signal of the operating breaker 1QF is directly triggered; the second switching-off signal of the operating breaker 1QF is due to the fact that the motor start is not completed within 40 seconds of the start time;
(3) The switching-on state signal of the bypass breaker 2QF is subjected to power-off delay, and then AND gate logic operation is carried out on the switching-on state signal of the operating breaker 1QF and the switching-off state signal of the bypass breaker 2QF, so that a third switching-off signal of the operating breaker 1QF is output; the specific logic is as follows: the switching-on state signal of the bypass breaker 2QF triggers a fifth delay off timer for 2 seconds, the output of the fifth delay off timer, the switching-on state signal of the running breaker 1QF and the switching-off state signal of the bypass breaker 2QF do AND gate logic operation, and the AND gate operation outputs a third switching-off signal of the running breaker 1 QF; the third opening signal of the operating breaker 1QF is due to the bypass breaker 2QF being switched from the closed state to the fault opening state when the starting is completed;
(4) Obtaining a parking signal and outputting a fourth brake-separating signal of the operating breaker 1 QF; the specific logic is as follows: when the parking signal is 1, the fourth brake-separating signal of the operating breaker 1QF is directly triggered; the fourth opening signal of the operating circuit breaker 1QF is controlled by the operator's perception.
In this embodiment, the condition for ending the motor start is that the running breaker 1QF and the bypass breaker 2QF are both in a closing state, and the specific logic is: and after the closing state of the running breaker 1QF and the closing state of the bypass breaker 2QF are subjected to AND gate logic operation, triggering a sixth delay closing timer for 2 seconds, and outputting a starting ending instruction by the sixth delay closing timer.
In the above embodiment, the opening and closing state of the same breaker is only the opening state or the closing state, so that when the closing state of a certain breaker is adopted for logic control, the non-gate of the opening state of the breaker can also be adopted for logic control, and the change is not separated from the content of the technical scheme, and belongs to the protection scope of the technical scheme.
In the embodiment, the technical scheme of the invention logically correlates the running breaker 1QF, the bypass breaker 2QF and the star point breaker 3QF in each starting stage, is used as the conditions for closing the running cabinet, the bypass cabinet and the star point cabinet, and also logically controls the switching time of each cabinet body and the limitation of motor current, thereby greatly simplifying the complexity of hard interlocking wiring, reducing the fault risk caused by actual wiring, and the whole logic control method has reasonable design and is suitable for being widely popularized and used.
Example 2
Referring to fig. 5 to 8, in embodiment 2, an electrical protection signal is added on the basis of embodiment 1, and the associated electrical protection signals are further subjected to logic control and interlocking, where it is to be noted that, in fig. 5, the digital identifiers 1 to 9 are correspondingly connected with the digital identifiers 1 to 9 in fig. 6, and in fig. 6, the digital identifiers 1 and 3 are correspondingly connected with the digital identifiers 1 and 3 in fig. 7, and in this embodiment, a logic control method of a serial autotransformer starting motor is provided, and a circuit breaker signal, a switching signal, a motor current signal and an electrical protection signal are obtained;
judging whether triggering conditions of the electric control normal signals are met or not according to the breaker signals and the electric protection signals;
triggering a first starting command according to an electric control normal signal and a switching signal to enable the star point breaker 3QF to be switched on;
triggering a second starting command according to the first starting command and the breaker signal to enable the running breaker 1QF to be switched on;
judging whether a trigger condition of a starting timeout signal is met or not according to the first starting command and the breaker signal;
according to the first starting command, the breaker signal and the motor current signal, or according to the breaker signal, the star point breaker 3QF is opened;
according to the first starting command, the breaker signal and the motor current signal, the bypass breaker 2QF is switched on;
according to the breaker signal, or according to the starting overtime signal, or according to the switch signal, the running breaker 1QF is opened;
starting the motor according to the signal of the circuit breaker;
judging whether the motor is allowed to be loaded or not according to the breaker signal and the motor current signal;
the operating circuit breaker 1QF is opened in accordance with the circuit breaker signal and the electrical protection signal, or in accordance with the electrical protection signal.
In this embodiment, the electrical protection signals include an overcurrent I-section brake-off signal, an overcurrent II-section brake-off signal, an overcurrent III-section brake-off signal, a low-voltage brake-off signal, a ground fault brake-off signal, a differential quick-break current brake-off signal, and a ratio differential current brake-off signal, and each of the electrical protection signals is output as "1" when operated.
In this embodiment, the overcurrent I-section switching-off signal, the overcurrent II-section switching-off signal, the overcurrent III-section switching-off signal, the low-voltage switching-off signal, and the ground fault switching-off signal perform an or gate logic operation, and output a backup protection trip signal, and a first set priority RS trigger is provided, the backup protection trip signal is input to a set end of the first set priority RS trigger, a reset end of the first set priority RS trigger is controlled by a comprehensive protection panel reset switch, and an output end of the first set priority RS trigger outputs an operation breaker 1QF backup protection switching-off signal.
In this embodiment, the differential quick-break current switching-off signal and the ratio differential current switching-off signal perform an or gate logic operation, and output a differential protection trip signal, and a second set priority RS trigger is provided, the differential protection trip signal is input to a set end of the second set priority RS trigger, a reset end of the second set priority RS trigger is controlled by a comprehensive protection panel reset switch, and an output end of the second set priority RS trigger outputs a differential protection switching-off signal of the operating circuit breaker 1 QF.
In this embodiment, the backup protection trip signal and the differential protection trip signal are also used as one of triggering conditions of the electrical control normal signal, that is, the electrical control normal signal triggers and the backup protection trip signal and the differential protection trip signal are required to have no output actions, which correlates with the electrical protection signal and further limits the conditions triggered by the electrical control normal signal.
In this embodiment, whether the motor is allowed to be loaded is further determined, and by setting a second reset priority RS trigger, where the motor current signal determines whether the collected motor current is less than 105% of the rated motor current as a first motor current signal, and the motor current signal determines whether the collected motor current is more than 110% of the rated motor current as a second motor current signal, where the first motor current signal is input to the set end of the second reset priority RS trigger, the second motor current signal is input to the reset end of the second reset priority RS trigger, and the output and start-up instruction of the second reset priority RS trigger performs and gate logic operation, and determines whether loading is allowed according to the signal output by the and gate operation.
In the embodiment, the technical scheme of the invention further improves the logic control of the series autotransformer starting motor by correlating the electric protection signals, improves the system control of the bottom layer, and realizes the omnibearing electric protection and the intrinsic safety of electric operation.
Example 3
A computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the logic control method of a series autotransformed start motor as described in embodiments 1 and 2.
The invention and its embodiments have been described above by way of illustration and not limitation, and the invention is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention.
Claims (9)
1. A logic control method of a series autotransformer starting motor is characterized in that a breaker signal, a switch signal and a motor current signal are obtained;
judging whether triggering conditions of the electric control normal signals are met or not according to the breaker signals;
triggering a first starting command according to an electric control normal signal and a switching signal to enable the star point breaker 3QF to be switched on;
triggering a second starting command according to the first starting command and the breaker signal to enable the running breaker 1QF to be switched on;
judging whether a trigger condition of a starting timeout signal is met or not according to the first starting command and the breaker signal;
the triggering conditions of the starting timeout signal include:
setting a reset priority RS trigger; the first starting command and a closing state signal of the running breaker 1QF are input to a setting end of a reset priority RS trigger after AND gate logic operation; the switching-off state signal of the operating breaker 1QF and the switching-on state signal of the bypass breaker 2QF are input to a reset end of a reset priority RS trigger after OR gate logic operation; the power-on delay is carried out on the output signal of the output end of the reset priority RS trigger so as to trigger the starting overtime signal;
according to the first starting command, the breaker signal and the motor current signal, or according to the breaker signal, the star point breaker 3QF is opened;
according to the first starting command, the breaker signal and the motor current signal, the bypass breaker 2QF is switched on;
according to the breaker signal, or according to the starting overtime signal, or according to the switch signal, the running breaker 1QF is opened;
and according to the breaker signal, starting the motor is finished.
2. The logic control method of a series autotransformed starter motor of claim 1, wherein the breaker signals include test position signals, operating position signals, spring stored energy signals, closing state signals, opening state signals, and grounding knife closing state signals of three breakers operating breaker 1QF, bypass breaker 2QF, and star point breaker 3QF, and the switch signals include a park signal and a start signal.
3. The logic control method of the series autotransformer starting motor according to claim 2, wherein the triggering condition of the electric control normal signal is that three breakers of the operating breaker 1QF, the bypass breaker 2QF and the star point breaker 3QF are all in a test position or a working position, the three breakers of the operating breaker 1QF, the bypass breaker 2QF and the star point breaker 3QF are all in a breaking state, springs of the three breakers of the operating breaker 1QF, the bypass breaker 2QF and the star point breaker 3QF are all stored, and a grounding knife of the operating breaker 1QF is in a breaking state; the condition for ending the motor starting is that the running breaker 1QF and the bypass breaker 2QF are both in a closing state.
4. A logic control method of a series autotransformer starter motor according to claim 3, wherein the triggering condition of the first start command is that the electronic control normal signal triggers and the start signal is received, and the triggering condition of the second start command is that the first start command is received and the star point breaker 3QF is in a closing state.
5. The logic control method of a series autotransformer starting motor according to claim 1, wherein the star point breaker 3QF opening can be triggered by satisfying any one of the following conditions:
(1) Judging whether the collected motor current falls below the rated current of the motor to be used as a motor current signal, carrying out power-on delay on an output signal of an output end of a reset priority RS trigger, carrying out AND gate logic operation on the output signal and the motor current signal, and outputting a first opening signal of the star point breaker 3 QF;
(2) The switching-on state signal of the running breaker 1QF and the switching-on state signal of the star point breaker 3QF are subjected to AND gate logic operation and then subjected to power-off delay, and then the switching-on state signal of the running breaker 1QF and the switching-off state signal of the star point breaker 3QF are subjected to AND gate logic operation, so that a second switching-off signal of the star point breaker 3QF is output.
6. The logic control method of a series autotransformer starter motor according to claim 5, wherein the bypass breaker 2QF closing signal is output after the following conditions are simultaneously satisfied at first:
(1) Acquiring a first opening signal of the star point breaker 3 QF;
(2) The running breaker 1QF is in a closing state;
(3) The bypass breaker 2QF is in a switching-off state;
(4) The star point breaker 3QF is in the open state.
7. The logic control method of the series autotransformer starting motor according to claim 5, wherein the operation breaker 1QF opening can be triggered by satisfying any one of the following conditions:
(1) Firstly, performing AND gate logic operation on a closing state signal of an operating breaker 1QF and a closing state signal of a star point breaker 3QF, then performing power-off delay, performing AND gate logic operation on a switching-off state signal of the star point breaker 3QF, performing power-on delay, and finally performing AND gate logic operation on a switching-off state signal of a bypass breaker 2QF, and outputting a first switching-off signal of the operating breaker 1 QF;
(2) Acquiring a starting timeout signal and outputting a second brake separating signal of the running breaker 1 QF;
(3) The switching-on state signal of the bypass breaker 2QF is subjected to power-off delay, and then AND gate logic operation is carried out on the switching-on state signal of the operating breaker 1QF and the switching-off state signal of the bypass breaker 2QF, so that a third switching-off signal of the operating breaker 1QF is output;
(4) And obtaining a parking signal and outputting a fourth brake-separating signal of the running breaker 1 QF.
8. A logic control method of a series autotransformer starting motor is characterized in that a breaker signal, a switch signal, a motor current signal and an electrical protection signal are obtained;
judging whether triggering conditions of the electric control normal signals are met or not according to the breaker signals and the electric protection signals;
triggering a first starting command according to an electric control normal signal and a switching signal to enable the star point breaker 3QF to be switched on;
triggering a second starting command according to the first starting command and the breaker signal to enable the running breaker 1QF to be switched on;
judging whether a trigger condition of a starting timeout signal is met or not according to the first starting command and the breaker signal;
the triggering conditions of the starting timeout signal include:
setting a reset priority RS trigger; the first starting command and a closing state signal of the running breaker 1QF are input to a setting end of a reset priority RS trigger after AND gate logic operation; the switching-off state signal of the operating breaker 1QF and the switching-on state signal of the bypass breaker 2QF are input to a reset end of a reset priority RS trigger after OR gate logic operation; the power-on delay is carried out on the output signal of the output end of the reset priority RS trigger so as to trigger the starting overtime signal;
according to the first starting command, the breaker signal and the motor current signal, or according to the breaker signal, the star point breaker 3QF is opened;
according to the first starting command, the breaker signal and the motor current signal, the bypass breaker 2QF is switched on;
according to the breaker signal, or according to the starting overtime signal, or according to the switch signal, the running breaker 1QF is opened;
starting the motor according to the signal of the circuit breaker;
judging whether the motor is allowed to be loaded or not according to the breaker signal and the motor current signal;
the operating circuit breaker 1QF is opened in accordance with the circuit breaker signal and the electrical protection signal, or in accordance with the electrical protection signal.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the logic control method of a series autotransformed start motor as claimed in any one of claims 1 to 8.
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| CN202210054281.3A CN114421825B (en) | 2022-01-18 | 2022-01-18 | Logic control method and storage medium for series autotransformer starting motor |
| CN202410139632.XA CN118041130A (en) | 2022-01-18 | 2022-01-18 | Logic control method for series autotransformer starting motor and readable storage medium |
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