CN114421825A - 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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- CN114421825A CN114421825A CN202210054281.3A CN202210054281A CN114421825A CN 114421825 A CN114421825 A CN 114421825A CN 202210054281 A CN202210054281 A CN 202210054281A CN 114421825 A CN114421825 A CN 114421825A
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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
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/02—Details of starting control
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Abstract
A logic control method and storage medium for starting a motor by a series autotransformer judges whether a trigger condition of an electric control normal signal is met or not according to a circuit breaker signal; triggering a first starting command according to the electric control normal signal and the switching signal to enable the star point circuit breaker 3QF to be switched on; triggering a second starting command according to the first starting command and the circuit breaker signal to enable the operating circuit breaker 1QF to be switched on; judging whether a triggering condition of a starting overtime signal is met or not according to the first starting command and the circuit breaker signal; according to the first starting command, the circuit breaker signal and the motor current signal or the circuit breaker signal, the star point circuit breaker 3QF is switched off; switching on a bypass breaker 2QF according to the first starting command, the breaker signal and the motor current signal; according to the breaker signal, or the starting overtime signal, or the switching signal, the operating breaker 1QF is switched off; and according to the circuit breaker signal, the motor starting is finished. The invention simplifies the interlocking connection and realizes the intrinsic safety of all-round 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 for 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 increasing, and the large current generated by directly starting the high-voltage super large-capacity motor can cause great harm to a power grid, the motor and the like.
The starting mode of the existing series autotransformer of the high-voltage cabinet is to cut off the autotransformer at regular time or cut off the autotransformer in a current reduction mode and then operate in a full-voltage mode, the autotransformer is cut off when the starting current is not reduced to a rated value easily due to the two cutting modes, the impact of the starting current on a power grid is caused, and low-voltage tripping of other operating equipment is caused due to the fact that the system voltage is pulled down.
As shown in fig. 1, the primary system diagram of the series autotransformer of the motor includes an operation breaker 1QF in an operation 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 ground switch QS, the operation of the motor is controlled by a start button and a stop button, when the operation breaker 1QF and the star point breaker 3QF are switched on, the series autotransformer AT performs step-down starting on the motor M, and when the operation breaker 1QF and the bypass breaker 2QF are switched on, the autotransformer AT is cut off to perform full-voltage operation on the motor M. Position signals of three circuit breakers, namely a 1QF circuit breaker, a 2QF bypass circuit breaker and a 3QF star circuit breaker, of the existing operating circuit breaker do not participate in logic control, misoperation is easily caused, traditional interlocking hard wiring is complex and has multiple fault points, electric protection cannot participate in the whole process, the circuit breakers do not have the action rejection protection, equipment of light persons heats seriously, insulation damage is caused, and short circuit accidents are caused by heavy persons.
Disclosure of Invention
In order to solve the problems, the technical scheme provided by the invention is as follows:
a logic control method for starting a motor by series-autotransformer is characterized by obtaining a circuit breaker signal, a switch signal and a motor current signal;
judging whether the triggering condition of the electric control normal signal is met or not according to the circuit breaker signal;
triggering a first starting command according to the electric control normal signal and the switching signal to enable the star point circuit breaker 3QF to be switched on;
triggering a second starting command according to the first starting command and the circuit breaker signal to enable the operating circuit breaker 1QF to be switched on;
judging whether a triggering condition of a starting overtime signal is met or not according to the first starting command and the circuit breaker signal;
opening the star point circuit breaker 3QF according to the first starting command, the circuit breaker signal and the motor current signal or according to the circuit breaker signal;
switching on a bypass breaker 2QF according to the first starting command, the breaker signal and the motor current signal;
according to the breaker signal, or according to the starting overtime signal, or according to the switching signal, the operating breaker 1QF is switched off;
and according to the circuit breaker signal, the motor starting is finished.
The invention is further set 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 the operating breaker 1QF, the bypass breaker 2QF and the star point breaker 3QF, and the switch signals comprise stopping signals and starting signals.
The triggering condition of the electric control normal signal is that three circuit breakers, namely the operation circuit breaker 1QF, the bypass circuit breaker 2QF and the star point circuit breaker 3QF are all at a test position or a working position, the three circuit breakers of the operation circuit breaker 1QF, the bypass circuit breaker 2QF and the star point circuit breaker 3QF are all at a brake-off state, springs of the operation circuit breaker 1QF, the bypass circuit breaker 2QF and the star point circuit breaker 3QF are all stored with energy, and a grounding knife of the operation circuit breaker 1QF is in a brake-off state; and the condition of finishing the starting of the motor is that the operating circuit breaker 1QF and the bypass circuit breaker 2QF are both in a closing state.
The triggering conditions of the electric control normal signals are harsh, three circuit breakers are required to be ensured to be in the opening state and the spring energy storage state at the test position or the working position at the same time, and the grounding switch of the circuit breaker 1QF is operated, and the circuit breakers can be specifically realized by using AND gate logic operation, so that self-checking before starting of the motor is realized, and the motor can be ensured to be started safely.
The invention further provides that the triggering condition of the first starting command is that the electric control normal signal is triggered and the starting signal is received.
On the premise that the electric control is normal, the starting signal is input, and the motor can be triggered to start.
The invention is further arranged that the triggering condition of the second starting command is that the first starting command is received and the star point circuit breaker 3QF is in a closing state.
The switching-on of the operating circuit breaker 1QF in the starting process needs to be carried out when the star point circuit breaker 3QF is in a switching-on state, so that the sequential switching-on interlocking of the operating circuit breaker 1QF and the star point circuit breaker 3QF is realized, and the current reduction starting of the motor is ensured.
The invention is further arranged that the trigger condition of the start time-out signal comprises:
setting a reset priority RS trigger;
performing AND gate logical operation on a first starting command and a closing state signal of an operating circuit breaker 1QF, and inputting the first starting command and the closing state signal to a setting end of a reset priority RS trigger;
performing OR gate logical operation on an opening state signal of the operating circuit breaker 1QF and a closing state signal of the bypass circuit breaker 2QF, and inputting the opening state signal and the closing state signal to a reset end of the reset priority RS trigger;
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 starting overtime time timing is triggered only after the first starting command and the closing state signal of the operating circuit breaker 1QF are received, and the starting overtime time timing is initialized and set to zero after any one of the opening state signal of the operating circuit breaker 1QF and the closing state signal of the bypass circuit breaker 2QF is received.
The invention further provides that the star point breaker 3QF brake-separating can be triggered when meeting any one of the following conditions:
(1) judging whether the collected motor current is reduced below the rated current of the motor to be used as a motor current signal, resetting an output end output signal of the priority RS trigger, carrying out power-on delay, carrying out AND gate logical operation on the output end output signal and the motor current signal, and outputting a first switching-off signal of the star point circuit breaker 3 QF;
(2) firstly, conducting AND gate logical operation on a closing state signal of the operating circuit breaker 1QF and a closing state signal of the star point circuit breaker 3QF, then conducting power-off delay, then conducting AND gate logical operation on the closing state signal of the operating circuit breaker 1QF and an opening state signal of the star point circuit breaker 3QF, and outputting a second opening signal of the star point circuit breaker 3 QF.
The star point breaker 3QF has two situations, wherein the first situation is that when the motor is normally started, after the operating breaker 1QF and the star point breaker 3QF are both switched on and the motor current is reduced to be below the rated current of the motor, the star point breaker 3QF is switched off to cut off the series of autotransformers; the second is that under the abnormal starting of the motor, when the operating circuit breaker 1QF and the star point circuit breaker 3QF are both switched on, the operating circuit breaker 1QF is switched off due to faults, and the star point circuit breaker 3QF is immediately linked with the operating circuit breaker 1QF to switch off.
The invention is further set that after the bypass breaker 2QF switching-on needs to simultaneously meet the following conditions, a bypass breaker 2QF switching-on signal is output:
(1) obtaining a first switching signal of a star point circuit breaker 3 QF;
(2) the operating circuit breaker 1QF is in a closing state;
(3) the bypass breaker 2QF is in an opening state;
(4) the star point circuit breaker 3QF is in an opening state.
The condition that needs to be satisfied when the bypass circuit breaker 2QF is switched on under the normal starting of the motor is described above, namely, after the star point circuit breaker 3QF is normally switched off in the starting process, the bypass circuit breaker 2QF is switched off when the operating circuit breaker 1QF is in a switched-on state, and the star point circuit breaker 3QF is in a switched-off state, the bypass circuit breaker 2QF can be switched on, at this moment, both the operating circuit breaker 1QF and the bypass circuit breaker 2QF are switched on, and the motor is in a full-voltage operating state.
The invention is further set that the operation breaker 1QF brake-separating can be triggered when meeting any one of the following conditions:
(1) firstly, performing AND gate logical operation on a closing state signal of an operating circuit breaker 1QF and a closing state signal of a star point circuit breaker 3QF, then performing power-off delay, performing AND gate logical operation on an opening state signal of the star point circuit breaker 3QF, performing power-on delay, finally performing AND gate logical operation on the opening state signal of a bypass circuit breaker 2QF, and outputting a first opening signal of the operating circuit breaker 1 QF;
(2) acquiring a starting overtime signal, and outputting a second switching signal for operating the circuit breaker 1 QF;
(3) performing power-off delay on a closing state signal of the bypass circuit breaker 2QF, performing AND gate logic operation on the closing state signal of the operating circuit breaker 1QF and an opening state signal of the bypass circuit breaker 2QF, and outputting a third opening signal of the operating circuit breaker 1 QF;
(4) and obtaining a stop signal and outputting a fourth brake signal for operating the breaker 1 QF.
The operating circuit breaker 1QF is subjected to four conditions, wherein the first condition is that the bypass circuit breaker 2QF rejects movement, and after the star point circuit breaker 3QF is normally opened in the starting process, the bypass circuit breaker 2QF is not closed within a specified time; the second is starting overtime, starting timing after receiving the first starting command, and the motor does not finish normal starting within the specified time; the third is that the bypass breaker 2QF is switched on and then is switched off in a fault manner when the starting is finished, and the operation breaker 1QF is switched off along with the fault switching-off of the bypass breaker 2 QF; and the fourth is that the operating circuit breaker 1QF is switched off when receiving the stop signal.
A logic control method for starting a motor by series-autotransformer obtains a circuit breaker signal, a switch signal, a motor current signal and an electrical protection signal;
judging whether the triggering condition of the electric control normal signal is met or not according to the circuit breaker signal and the electric protection signal;
triggering a first starting command according to the electric control normal signal and the switching signal to enable the star point circuit breaker 3QF to be switched on;
triggering a second starting command according to the first starting command and the circuit breaker signal to enable the operating circuit breaker 1QF to be switched on;
judging whether a triggering condition of a starting overtime signal is met or not according to the first starting command and the circuit breaker signal;
opening the star point circuit breaker 3QF according to the first starting command, the circuit breaker signal and the motor current signal or according to the circuit breaker signal;
switching on a bypass breaker 2QF according to the first starting command, the breaker signal and the motor current signal;
according to the breaker signal, or according to the starting overtime signal, or according to the switching signal, the operating breaker 1QF is switched off;
according to the circuit breaker signal, the motor is started to finish;
judging whether the motor is allowed to be loaded or not according to the circuit breaker signal and the motor current signal;
the operating circuit breaker 1QF is switched off as a function of the circuit breaker signal and the electrical protection signal or as a function of the electrical protection signal.
The logic control of the series autotransformer starting motor is further combined with an electrical protection signal, a backup protection trip signal and a differential protection trip signal are interlocked, the triggering condition of an electric control normal signal is further required, and the comprehensive interlocking protection of the series autotransformer starting of the motor is realized.
A computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the above-described method of logic control for a series autotransformer starter motor.
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 associates the operation circuit breaker 1QF, the bypass circuit breaker 2QF and the star point circuit breaker 3QF at each starting stage according to the action sequence of the three circuit breakers in the actual starting process of the series autotransformer starting motor, and takes the logical association as the allowable conditions for switching on the operation cabinet, the bypass cabinet and the star point cabinet, and also logically controls the switching time of each cabinet body and the limitation of the motor current, thereby not only perfecting the system control at the bottom layer, but also realizing the essential safety of all-round electrical protection and electrical operation.
The logic control method for the series autotransformer starting motor carries out logic control on the position signals and the state signals of the three circuit breakers, associates with the electric protection signals, greatly simplifies the complexity of hard interlocking wiring, reduces the fault risk brought by actual wiring, has reasonable design of the whole logic control method, and is suitable for wide popularization and use.
Drawings
FIG. 1 is a diagram of a primary system according to an embodiment of the present invention.
Fig. 2 is a first logic control diagram according to embodiment 1 of the present invention.
Fig. 3 is a second logic control diagram according to embodiment 1 of the present invention.
Fig. 4 is a general logic control diagram according to embodiment 1 of the present invention.
Fig. 5 is a first logic control diagram according to embodiment 2 of the present invention.
Fig. 6 is a second logic control diagram according to embodiment 2 of the present invention.
Fig. 7 is a logic control diagram of a third part in embodiment 2 of the present invention.
Fig. 8 is a general logic control diagram according to embodiment 2 of the present invention.
Detailed Description
For a further understanding of the present invention, reference will now be made in detail to the embodiments illustrated in the drawings.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, integrally connected, or detachably connected; either mechanically or electrically, or internally communicating two elements; they may be directly connected or indirectly connected through an intermediate, and those skilled in the art will understand the specific meanings of the above terms according to specific situations.
Example 1
The primary system diagram of the series autotransformer of the motor in the embodiment is combined with the attached drawing 1, and comprises an operation breaker 1QF in an operation 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 motor is controlled to work through a start button and a stop button, when the operation breaker 1QF and the star point breaker 3QF are switched on, the series autotransformer AT performs step-down starting on the motor M, and when the operation breaker 1QF and the bypass breaker 2QF are switched on, 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 numerical identifiers 1 to 9 in fig. 2 and the numerical identifiers 1 to 9 in fig. 2 are correspondingly connected, and the technical scheme of the invention is a logic control method for starting a motor by a series autotransformer, which obtains a circuit breaker signal, a switch signal and a motor current signal;
judging whether the triggering condition of the electric control normal signal is met or not according to the circuit breaker signal;
triggering a first starting command according to the electric control normal signal and the switching signal to enable the star point circuit breaker 3QF to be switched on;
triggering a second starting command according to the first starting command and the circuit breaker signal to enable the operating circuit breaker 1QF to be switched on;
judging whether a triggering condition of a starting overtime signal is met or not according to the first starting command and the circuit breaker signal;
opening the star point circuit breaker 3QF according to the first starting command, the circuit breaker signal and the motor current signal or according to the circuit breaker signal;
switching on a bypass breaker 2QF according to the first starting command, the breaker signal and the motor current signal;
according to the breaker signal, or according to the starting overtime signal, or according to the switching signal, the operating breaker 1QF is switched off;
and according to the circuit breaker signal, the motor starting is finished.
In the embodiment, the breaker signals comprise 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, a working position signal of the operating breaker 1QF, a working position signal of the bypass breaker 2QF, a working position signal of the star point breaker 3QF, a spring non-energy-storage signal of the operating breaker 1QF, and a spring non-energy-storage signal of the bypass breaker 2QF, the system comprises a spring non-energy-storage signal of a star point breaker 3QF, a closing state signal of an operating breaker 1QF, a closing state signal of a bypass breaker 2QF, a closing state signal of the star point breaker 3QF, an opening state signal of the operating breaker 1QF, an opening state signal of the bypass breaker 2QF, an opening state signal of the star point breaker 3QF and a closing state signal of a grounding switch of the operating breaker 1 QF. In another embodiment, the spring energy storage failure signal of the operating circuit breaker 1QF, the spring energy storage failure signal of the bypass circuit breaker 2QF, and the spring energy storage failure signal of the star point circuit breaker 3QF may also be the spring energy storage signal of the operating circuit breaker 1QF, the spring energy storage signal of the bypass circuit breaker 2QF, and the spring energy storage signal of the star point circuit breaker 3 QF.
In the present embodiment, the switching signal includes a stop signal and a start signal.
In this embodiment, the triggering condition of the electronic control normal signal is that three circuit breakers, namely the operating circuit breaker 1QF, the bypass circuit breaker 2QF and the star point circuit breaker 3QF, are all in test positions or working positions, the three circuit breakers of the operating circuit breaker 1QF, the bypass circuit breaker 2QF and the star point circuit breaker 3QF are all in a brake-off state, springs of the operating circuit breaker 1QF, the bypass circuit breaker 2QF and the star point circuit breaker 3QF have stored energy, and a grounding switch of the operating circuit breaker 1QF is in a brake-off state; and the condition of finishing the starting of the motor is that the operating circuit breaker 1QF and the bypass circuit breaker 2QF are both in a closing state. The self-checking method can be realized by using AND gate logic operation, realizes self-checking before the motor is started, and ensures that the motor can be started safely.
In this embodiment, the triggering condition of the first start command is that the electronic control normal signal is triggered and the start signal is received, and the specific logical association is: and performing AND gate logical operation on the first start command, the NOT gate of the parking signal and the start signal to ensure that the first start command needs to be triggered by inputting the first start command to be '1', the parking signal is input to be '0' and the start signal is input to be '1', and after the first start command is triggered, sending a pulse signal for 2 seconds to close the star point circuit breaker 3 QF.
In this embodiment, the triggering condition of the second start command is that the first start command is received and the star point circuit breaker 3QF is in a closed state, and the specific logic is as follows: when the input of the first starting command is '1', triggering a first time delay disconnection timer of 3 seconds, carrying out AND gate logical operation on the output of the first time delay disconnection timer and a closing signal of a star point circuit breaker 3QF, triggering a first time delay closing timer of 1 second by the output of the AND gate logical operation, and outputting a pulse signal of 2 seconds by the first time delay closing timer to enable the circuit breaker 1QF to be operated to close.
In the embodiment, the trigger condition logic of the start timeout signal is to set a first reset priority RS flip-flop;
performing AND gate logical operation on the output of the first delayed turn-off timer and a closing state signal of the operating circuit breaker 1QF, and then inputting the output and the closing state signal to a setting end of the first reset priority RS trigger;
performing OR gate logical operation on an opening state signal of the operating circuit breaker 1QF and a closing state signal of the bypass circuit breaker 2QF, and inputting the opening state signal and the closing state signal to a reset end of the first reset priority RS trigger;
the output of the first reset priority RS flip-flop triggers a second 40 second delay close timer to trigger the start timeout signal. By setting the first reset priority RS trigger, the starting of the overtime time timing is triggered only after receiving the first starting command and the closing state signal of the operating circuit breaker 1QF, and the starting of the overtime time timing is initialized to zero after receiving any one of the opening state signal of the operating circuit breaker 1QF and the closing state signal of the bypass circuit breaker 2 QF.
In this embodiment, the star point circuit breaker 3QF opening can be triggered when meeting any one of the following conditions:
(1) judging whether the collected motor current is reduced below the rated current of the motor to serve as a motor current signal, triggering a third time delay closing timer for 5 seconds by the output of the first reset priority RS trigger, carrying out AND gate logical operation on the output of the third time delay closing timer and the motor current signal, and outputting a first switching signal of a star point circuit breaker 3QF by the AND gate operation; the first brake separating signal of the star point circuit breaker 3QF is the brake separating of the star point circuit breaker 3QF in the normal starting process of the motor;
(2) firstly, performing AND gate logical operation on a closing state signal of an operating circuit breaker 1QF and a closing state signal of a star point circuit breaker 3QF, triggering a second delay disconnection timer for 2 seconds, performing AND gate logical operation on the output of the second delay disconnection timer and a brake disconnection state signal of the operating circuit breaker 1QF, and outputting a second brake disconnection signal of the star point circuit breaker 3QF through the AND gate operation; the second switching signal of the star point breaker 3QF is the switching-off of the star point breaker 3QF in the abnormal starting process of the motor, and the specific reason is that the operating breaker 1QF is converted from a switching-on state to a switching-off state in the starting process, so that the star point breaker 3QF is interlocked and switched off.
In this embodiment, the bypass breaker 2QF switching first needs to satisfy the following conditions at the same time:
(1) obtaining a first switching signal of a star point circuit breaker 3 QF;
(2) the operating circuit breaker 1QF is in a closing state;
(3) the bypass breaker 2QF is in an opening state;
(4) the star point circuit breaker 3QF is in a brake-off state;
the specific logic is as follows: triggering a third delay disconnection timer of 3 seconds by using a first switching signal of a star point breaker 3QF, carrying out AND gate logical operation on the output of the third delay disconnection timer, a closing state signal of an operating breaker 1QF, a switching-off state signal of a bypass breaker 2QF and a switching-off state signal of the star point breaker 3QF, triggering a fourth delay closing timer of 1 second by the AND gate operation output, and outputting a pulse signal of 2 seconds by the fourth delay closing timer to close the bypass breaker 2 QF.
In this embodiment, the operation breaker 1QF opening can be triggered when meeting any one of the following conditions:
(1) firstly, performing AND gate logical operation on a closing state signal of an operating circuit breaker 1QF and a closing state signal of a star point circuit breaker 3QF, then performing power-off delay, performing AND gate logical operation on an opening state signal of the star point circuit breaker 3QF, performing power-on delay, finally performing AND gate logical operation on the opening state signal of a bypass circuit breaker 2QF, and outputting a first opening signal of the operating circuit breaker 1 QF; the specific logic is as follows: after performing AND gate logical operation on a closing state signal of the operating circuit breaker 1QF and a closing state signal of the star point circuit breaker 3QF, triggering a fourth delay opening timer of 2.5 seconds, performing AND gate logical operation on the output of the fourth delay opening timer and a separating gate state signal of the star point circuit breaker 3QF, triggering a fifth delay closing timer of 2 seconds through the AND gate logical operation on the fifth delay closing timer and the separating gate state signal of the bypass circuit breaker 2QF, and outputting a first separating gate signal of the operating circuit breaker 1QF through the AND gate logical operation; the operation of the circuit breaker 1QF first opening signal is due to the bypass circuit breaker 2QF failing to operate during the starting process;
(2) acquiring a starting overtime signal, and outputting a second switching signal for operating the circuit breaker 1 QF; the specific logic is as follows: when the starting overtime signal output is '1', directly triggering a second switching signal of the operating circuit breaker 1 QF; the second switching signal of the circuit breaker 1QF is operated because the motor starting is not completed within the starting time of 40 seconds;
(3) performing power-off delay on a closing state signal of the bypass circuit breaker 2QF, performing AND gate logic operation on the closing state signal of the operating circuit breaker 1QF and an opening state signal of the bypass circuit breaker 2QF, and outputting a third opening signal of the operating circuit breaker 1 QF; the specific logic is as follows: triggering a fifth delay disconnection timer of 2 seconds by the closing state signal of the bypass circuit breaker 2QF, and performing AND gate logical operation on the output of the fifth delay disconnection timer, the closing state signal of the operating circuit breaker 1QF and the opening state signal of the bypass circuit breaker 2QF, wherein the AND gate operation outputs a third opening signal of the operating circuit breaker 1 QF; the third opening signal of the operating circuit breaker 1QF is that the bypass circuit breaker 2QF is switched from a closing state to a fault opening state when the starting is completed;
(4) obtaining a parking signal, and outputting a fourth brake signal for operating the breaker 1 QF; the specific logic is as follows: when the parking signal is '1', directly triggering a fourth brake signal of the operating circuit breaker 1 QF; the operation of the breaker 1QF fourth breaking signal is controlled by the operator's opinion.
In this embodiment, the condition that the motor is started and ended is that the operating circuit breaker 1QF and the bypass circuit breaker 2QF are both in a closing state, and the specific logic is as follows: and performing AND gate logical operation on the closing state of the operating circuit breaker 1QF and the closing state of the bypass circuit breaker 2QF, and triggering a sixth delay closing timer for 2 seconds, wherein the sixth delay closing timer outputs a starting ending instruction.
In the above embodiment, the opening/closing state of the same circuit breaker is only the opening state or the closing state, so that when the closing state of a certain circuit breaker is used for logic control, the not gate of the opening state of the circuit breaker can also be used for logic control, and such changes do not depart from the content of the technical scheme, and belong to the protection scope of the technical scheme.
In the embodiment, the technical scheme of the invention logically associates the operation circuit breaker 1QF, the bypass circuit breaker 2QF and the star point circuit breaker 3QF at each starting stage to serve as the conditions for allowing the switching-on of the operation cabinet, the bypass cabinet and the star point cabinet, and logically controls the switching time of each cabinet body and the limitation of the motor current, thereby greatly simplifying the complexity of hard interlocking wiring, reducing the fault risk caused by actual wiring, and having reasonable design of the overall logical control method, and being suitable for wide popularization and use.
Example 2
With reference to fig. 5 to 8, in embodiment 2, an electrical protection signal is added on the basis of embodiment 1, and logic control interlocking is further performed by associating the electrical protection signal, it should be noted that the digital identifiers 1 to 9 in fig. 5 and the digital identifiers 1 to 9 in fig. 6 are correspondingly connected, the digital identifiers 1 and 3 in fig. 6 and the digital identifiers 1 and 3 in fig. 7 are correspondingly connected, and this embodiment is a logic control method for a series transformer starting motor, and a circuit breaker signal, a switching signal, a motor current signal and an electrical protection signal are obtained;
judging whether the triggering condition of the electric control normal signal is met or not according to the circuit breaker signal and the electric protection signal;
triggering a first starting command according to the electric control normal signal and the switching signal to enable the star point circuit breaker 3QF to be switched on;
triggering a second starting command according to the first starting command and the circuit breaker signal to enable the operating circuit breaker 1QF to be switched on;
judging whether a triggering condition of a starting overtime signal is met or not according to the first starting command and the circuit breaker signal;
opening the star point circuit breaker 3QF according to the first starting command, the circuit breaker signal and the motor current signal or according to the circuit breaker signal;
switching on a bypass breaker 2QF according to the first starting command, the breaker signal and the motor current signal;
according to the breaker signal, or according to the starting overtime signal, or according to the switching signal, the operating breaker 1QF is switched off;
according to the circuit breaker signal, the motor is started to finish;
judging whether the motor is allowed to be loaded or not according to the circuit breaker signal and the motor current signal;
the operating circuit breaker 1QF is switched off as a function of the circuit breaker signal and the electrical protection signal or as a function of the electrical protection signal.
In this embodiment, the electrical protection signals include an overcurrent I-stage switching signal, an overcurrent II-stage switching signal, an overcurrent III-stage switching signal, a low-voltage switching signal, a ground fault switching signal, a differential quick-break current switching signal, and a ratiometric differential current switching signal, and each of the electrical protection signals is output as "1" during operation.
In this embodiment, an overcurrent I-section tripping signal, an overcurrent II-section tripping signal, an overcurrent III-section tripping signal, a low-voltage tripping signal and a ground fault tripping signal are subjected to or gate logic operation to output a backup protection tripping signal, and a first set priority RS trigger is provided, the backup protection tripping 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 reset switch of a comprehensive protection panel, and an output end of the first set priority RS trigger outputs a 1QF backup protection tripping signal of the operating circuit breaker.
In this embodiment, the differential fast-breaking current tripping signal and the rate differential current tripping signal are subjected to an or gate logical operation to output a differential protection tripping signal, and a second set priority RS flip-flop is provided, the differential protection tripping signal is input to a set end of the second set priority RS flip-flop, a reset end of the second set priority RS flip-flop is controlled by a reset switch of the integrated protection panel, and an output end of the second set priority RS flip-flop outputs a 1QF differential protection tripping signal of the operating circuit breaker.
In this embodiment, the backup protection trip signal and the differential protection trip signal are also used as one of the triggering conditions of the electronic control normal signal, that is, the triggering of the electronic control normal signal requires that neither the backup protection trip signal nor the differential protection trip signal have an output action, so that the electrical protection signal is related, and the triggering condition of the electronic control normal signal is further limited.
In this embodiment, whether the motor is allowed to be loaded is further determined, and a second reset priority RS flip-flop is set, where a motor current signal determines whether the acquired motor current is less than 105% of the rated current of the motor as a first motor current signal, a motor current signal determines whether the acquired motor current is greater than 110% of the rated current of the motor as a second motor current signal, the first motor current signal is input to a set terminal of the second reset priority RS flip-flop, the second motor current signal is input to a reset terminal of the second reset priority RS flip-flop, an and gate logic operation is performed on the output of the second reset priority RS flip-flop and a start end instruction, and whether the loading is allowed is determined according to a 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 associating the electrical protection signal, not only improves the system control of the bottom layer, but also realizes the intrinsic safety of all-round electrical protection and electrical 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 autotransformer starting motor as described in embodiment 1 and embodiment 2.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (10)
1. A logic control method for starting a motor by series-autotransformer is characterized by obtaining a circuit breaker signal, a switch signal and a motor current signal;
judging whether the triggering condition of the electric control normal signal is met or not according to the circuit breaker signal;
triggering a first starting command according to the electric control normal signal and the switching signal to enable the star point circuit breaker 3QF to be switched on;
triggering a second starting command according to the first starting command and the circuit breaker signal to enable the operating circuit breaker 1QF to be switched on;
judging whether a triggering condition of a starting overtime signal is met or not according to the first starting command and the circuit breaker signal;
opening the star point circuit breaker 3QF according to the first starting command, the circuit breaker signal and the motor current signal or according to the circuit breaker signal;
switching on a bypass breaker 2QF according to the first starting command, the breaker signal and the motor current signal;
according to the breaker signal, or according to the starting overtime signal, or according to the switching signal, the operating breaker 1QF is switched off;
and according to the circuit breaker signal, the motor starting is finished.
2. The logic control method of the series autotransformer starting motor according to claim 1, wherein the breaker signals comprise test position signals, working position signals, spring non-energy-storage signals, closing state signals, opening state signals and grounding switch closing state signals of three circuit breakers of a running circuit breaker 1QF, a bypass circuit breaker 2QF and a star point circuit breaker 3QF, and the switch signals comprise stop signals and start signals.
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 circuit breakers of the operation circuit breaker 1QF, the bypass circuit breaker 2QF and the star point circuit breaker 3QF are all in a test position or a working position, the three circuit breakers of the operation circuit breaker 1QF, the bypass circuit breaker 2QF and the star point circuit breaker 3QF are all in a brake separating state, springs of the operation circuit breaker 1QF, the bypass circuit breaker 2QF and the star point circuit breaker 3QF are all stored with energy, and a grounding knife of the operation circuit breaker 1QF is in a brake separating state; and the condition of finishing the starting of the motor is that the operating circuit breaker 1QF and the bypass circuit breaker 2QF are both in a closing state.
4. The logic control method of a series of autotransformer starting motors as claimed in claim 3, wherein the triggering condition of the first start command is that the electric control normal signal is triggered 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 4, wherein the trigger condition of said start time-out signal comprises:
setting a reset priority RS trigger;
performing AND gate logical operation on a first starting command and a closing state signal of an operating circuit breaker 1QF, and inputting the first starting command and the closing state signal to a setting end of a reset priority RS trigger;
performing OR gate logical operation on an opening state signal of the operating circuit breaker 1QF and a closing state signal of the bypass circuit breaker 2QF, and inputting the opening state signal and the closing state signal to a reset end of the reset priority RS trigger;
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.
6. The logic control method of a series autotransformer starting motor according to claim 5, wherein the star point circuit breaker 3QF opening can be triggered when any one of the following conditions is met:
(1) judging whether the collected motor current is reduced below the rated current of the motor to be used as a motor current signal, resetting an output end output signal of the priority RS trigger, carrying out power-on delay, carrying out AND gate logical operation on the output end output signal and the motor current signal, and outputting a first switching-off signal of the star point circuit breaker 3 QF;
(2) firstly, conducting AND gate logical operation on a closing state signal of the operating circuit breaker 1QF and a closing state signal of the star point circuit breaker 3QF, then conducting power-off delay, then conducting AND gate logical operation on the closing state signal of the operating circuit breaker 1QF and an opening state signal of the star point circuit breaker 3QF, and outputting a second opening signal of the star point circuit breaker 3 QF.
7. The logic control method of the series autotransformer starting motor according to claim 6, wherein after the bypass breaker 2QF closing first needs to satisfy the following conditions at the same time, a bypass breaker 2QF closing signal is output:
(1) obtaining a first switching signal of a star point circuit breaker 3 QF;
(2) the operating circuit breaker 1QF is in a closing state;
(3) the bypass breaker 2QF is in an opening state;
(4) the star point circuit breaker 3QF is in an opening state.
8. The logic control method for a series of autotransformer starting motors is characterized in that the operation breaker 1QF opening brake can be triggered by meeting any one of the following conditions:
(1) firstly, performing AND gate logical operation on a closing state signal of an operating circuit breaker 1QF and a closing state signal of a star point circuit breaker 3QF, then performing power-off delay, performing AND gate logical operation on an opening state signal of the star point circuit breaker 3QF, performing power-on delay, finally performing AND gate logical operation on the opening state signal of a bypass circuit breaker 2QF, and outputting a first opening signal of the operating circuit breaker 1 QF;
(2) acquiring a starting overtime signal, and outputting a second switching signal for operating the circuit breaker 1 QF;
(3) performing power-off delay on a closing state signal of the bypass circuit breaker 2QF, performing AND gate logic operation on the closing state signal of the operating circuit breaker 1QF and an opening state signal of the bypass circuit breaker 2QF, and outputting a third opening signal of the operating circuit breaker 1 QF;
(4) and obtaining a stop signal and outputting a fourth brake signal for operating the breaker 1 QF.
9. A logic control method for starting a motor by series-autotransformer is characterized by obtaining a circuit breaker signal, a switch signal, a motor current signal and an electric protection signal;
judging whether the triggering condition of the electric control normal signal is met or not according to the circuit breaker signal and the electric protection signal;
triggering a first starting command according to the electric control normal signal and the switching signal to enable the star point circuit breaker 3QF to be switched on;
triggering a second starting command according to the first starting command and the circuit breaker signal to enable the operating circuit breaker 1QF to be switched on;
judging whether a triggering condition of a starting overtime signal is met or not according to the first starting command and the circuit breaker signal;
opening the star point circuit breaker 3QF according to the first starting command, the circuit breaker signal and the motor current signal or according to the circuit breaker signal;
switching on a bypass breaker 2QF according to the first starting command, the breaker signal and the motor current signal;
according to the breaker signal, or according to the starting overtime signal, or according to the switching signal, the operating breaker 1QF is switched off;
according to the circuit breaker signal, the motor is started to finish;
judging whether the motor is allowed to be loaded or not according to the circuit breaker signal and the motor current signal;
the operating circuit breaker 1QF is switched off as a function of the circuit breaker signal and the electrical protection signal or as a function of the electrical protection signal.
10. A computer-readable storage medium, characterized in that a computer program is stored thereon, which, when being executed by a processor, implements the steps of the logic control method of a serial autotransformer starter motor according to any one of claims 1 to 9.
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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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| CN202210054281.3A CN114421825B (en) | 2022-01-18 | 2022-01-18 | Logic control method and storage medium for series autotransformer starting motor |
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| CN118041130A (en) | 2024-05-14 |
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