CN111505498B - System for virtual experiment of current relay characteristics and implementation method thereof - Google Patents
System for virtual experiment of current relay characteristics and implementation method thereof Download PDFInfo
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- CN111505498B CN111505498B CN202010510420.XA CN202010510420A CN111505498B CN 111505498 B CN111505498 B CN 111505498B CN 202010510420 A CN202010510420 A CN 202010510420A CN 111505498 B CN111505498 B CN 111505498B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
Abstract
The invention discloses a system for virtual experiment of current relay characteristics and a realization method thereof, wherein the system comprises: the equipment virtual module simulates and generates virtual elements corresponding to the real elements according to the current relay characteristic experiment principle diagram and provides setting of parameters of the virtual elements in the virtual circuit; the adjusting module is used for adjusting the virtual current magnitude or the relay parameter value of the virtual circuit, and starting the condition achievement processing module to monitor the virtual current trigger condition so as to record the current action value and the return value; the current presenting module is used for acquiring the current of the virtual circuit in real time and presenting the current; the condition achievement processing module is used for monitoring whether the virtual current triggering condition is achieved, triggering the recording module when the current of the virtual circuit reaches an action value or a return value, and executing externalization expression of action or return of the real current relay; and the recording module is used for recording the action/return current value in the experimental process and analyzing the experimental data.
Description
Technical Field
The invention relates to the technical field of electrical control and relay protection, in particular to a system for virtual experiment of current relay characteristics and an implementation method thereof.
Background
When a fault occurs and an abnormal operation condition occurs in an electric power system, the normal operation of the system is damaged, so that power supply for a user is stopped or reduced, and sometimes equipment is damaged. In order to prevent accidents or reduce the accident range, improve the reliability of the operation of the power system, and ensure safe and continuous power supply to users to the maximum extent, a special relay protection device is required in the power system.
A relay protection device must be able to correctly distinguish whether a protected element is in a normal operation state or a failure state, and a protection device must be configured based on the characteristics of changes in electrical physical quantities before and after a failure of an electric power system in order to achieve this function. For example: overcurrent protection is provided by an increase in current at the time of a short-circuit fault.
A current relay is a common relay protection device for a power system. The experimental study of the characteristics of the current relay plays an important role in guaranteeing the normal operation of the power system, and the current relay is generally adopted to carry out characteristic experiments at present.
However, when a current relay real object is adopted to carry out a characteristic experiment, the return coefficient needs to be changed, the difficulty in adjusting the position of a tongue piece limiting screw of the real object relay, the acting force of a spring, the contact pressure and the like is high, and the precision of equipment is easily reduced and even the equipment is damaged by frequently adjusting a real object mechanism; and the current relay characteristic material object experiment relates to commercial power and 220V direct current, the experimental process needs to take measures to ensure the safety of experimenters, and the material object experiment is not suitable for remote operation.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a system for a virtual experiment of the characteristics of a current relay and an implementation method thereof, so as to simulate the influence of various parameter changes of the current relay on an action current and a return current by using a virtual technology, ensure the safety of the characteristic experiment of the current relay and get rid of the limitation of experiment time and space.
To achieve the above and other objects, the present invention provides a system for virtual experiment of characteristics of a current relay, comprising:
the device virtual module is used for generating virtual elements corresponding to the real elements according to simulation of a current relay characteristic experiment principle diagram, connecting the virtual elements according to the principle diagram to generate a virtual circuit, and providing setting of parameters of the virtual elements in the virtual circuit;
the adjusting module is used for adjusting the virtual current magnitude or the relay parameter value of the virtual circuit, wherein the virtual current magnitude is adjusted to test the virtual current relay current action value and the current return value, the starting condition achieving processing module monitors the virtual current trigger condition to record the current action value and the current return value, and the relay parameter value is adjusted to change the relay current action value and the return value;
the current presentation module is used for acquiring the current of the virtual circuit in real time according to the parameter adjustment of the adjustment module and presenting the current;
the condition achievement processing module is used for monitoring whether the virtual current triggering condition is achieved or not, judging whether the current of the virtual circuit reaches an action value or a return value or not, triggering the recording module when the judgment result is yes, and simultaneously executing externalization expression of action or return of the real current relay;
and the recording module is used for recording the action/return current value in the experimental process and analyzing the experimental data.
Preferably, the virtual circuit comprises a virtual voltage regulator, a virtual slide wire resistor, a virtual current meter, a virtual current relay and a virtual load, the virtual voltage regulator is used for converting virtual 220V alternating current into low-voltage alternating current, the virtual slide wire resistor is used for limiting the output current of the low-voltage alternating current, the virtual ammeter is used for detecting the current value of the low-voltage alternating current, the virtual current relay is used for finishing the purpose of controlling the high voltage of the low-voltage alternating current, the virtual load is used for displaying the control effect of the virtual circuit, the virtual 220V alternating current live wire zero line is respectively connected to the primary end of the virtual voltage regulator, the virtual low-voltage alternating current is output from a secondary tap of the virtual voltage regulator and is connected to one end of the virtual slide wire resistor, the sliding contact end of the virtual slide wire resistor is connected to one control end of the virtual current relay through the virtual ammeter, and the other control end of the virtual current relay and the secondary ground end of the virtual voltage regulator are connected to the primary ground end of the virtual voltage regulator.
Preferably, the tap of the virtual voltage regulator is initially set at 0V, the sliding contact of the virtual slide wire resistor is initially set at the middle position of the slide wire resistor, and the corresponding switch is turned on after the circuit is checked to be error-free so as to operate the virtual circuit.
Preferably, the adjusting module increases the voltage of the virtual voltage regulator or decreases the resistance value of the virtual slide wire resistor to slowly increase the current, and records the minimum current value of the virtual current relay during the just-acting process as the current action value.
Preferably, the adjusting module makes the current slowly decrease by decreasing the virtual voltage regulator or increasing the resistance value of the virtual slide wire resistor, and records the maximum current value when the virtual current relay returns as the current return value.
Preferably, the adjusting module changes the number of turns N of the virtual current relay coilKAReaction moment M of springSMagnetic resistance RCThereby changing the current action value and the return value of the virtual current relay.
Preferably, the adjusting module includes a precise adjusting module and a step adjusting module, the precise adjusting module is implemented by providing a parameter window for a user to directly key in a new numerical value, the step adjusting module includes an automatic mode, a mouse mode and a keyboard mode, the automatic mode is that a corresponding parameter value is increased or decreased at a certain time interval from a preset initial value of a parameter according to a certain step length, and the mouse mode and the keyboard mode provide mouse dragging or a set keyboard shortcut key for implementation.
Preferably, the current presentation module presents the virtual current value change condition in an abstract way by using color and sound variables, and visually presents the virtual current value change condition by using numerical values and image variables.
In order to achieve the above object, the present invention further provides a method for implementing a system for virtual experiment of characteristics of a current relay, comprising the following steps:
step S1, generating virtual elements corresponding to the real elements according to the simulation of the current relay characteristic experiment schematic diagram, connecting the virtual elements according to the schematic diagram to generate virtual circuits, and providing the setting of parameters of the virtual elements in the virtual circuits;
step S2, adjusting the virtual current of the virtual circuit, testing the current action value and the current return value of the virtual current relay, and adjusting the relay parameter value to finish multiple tests;
step S3, obtaining the current of the virtual circuit in real time according to the adjustment of the virtual current in the step S2 for presentation;
in step S4, the action/return current value during the experiment is recorded, the experiment data is analyzed, and the analysis result is output.
Preferably, the step S2 further includes:
step S200, the current value is slowly increased by adjusting the virtual current of the virtual circuit, and the minimum current value of the virtual current relay during the just action is recorded, namely the current action value;
step S201, after the virtual current relay acts, the current value is reduced smoothly by adjusting the virtual current of the virtual circuit, and the maximum current value when the virtual current relay returns is recorded, namely the current return value;
step S202, changing partial parameters of the virtual current relay to increase the current action value and the return value of the virtual current relay, and returning to step S200 to obtain multiple groups of data.
Preferably, in step S202, the current action value and the current return value are set by one of the following methods: (1) reducing the number of turns N of the virtual current relay coilKA(ii) a (2) Increasing the reaction moment M of the virtual current relay springS(ii) a (3) Increasing the reluctance R of the virtual current relayC。
Compared with the prior art, the invention has the following beneficial effects:
1. the invention can be used for virtually adjusting relay parameters which are difficult to adjust in a physical experiment by using a current relay characteristic virtual experiment, and comprehensively researching the influence of the parameters on the relay characteristics.
2. The invention is used for carrying out virtual experiment of the characteristics of the current relay, realizes high flexibility and can be free from the limitation of experiment time and space.
3. The invention has low cost and does not need to put into relay material objects and matched equipment.
Drawings
FIG. 1 is a system architecture diagram of a system for virtual experiment of current relay characteristics according to the present invention;
FIG. 2 is a diagram of the connection lines of the dummy circuit according to the embodiment of the present invention;
FIG. 3 is a flow chart illustrating the steps of a method for implementing a system for virtual experiments on characteristics of a current relay according to the present invention;
FIG. 4 is a flow chart of an embodiment of the present invention.
Detailed Description
Other advantages and capabilities of the present invention will be readily apparent to those skilled in the art from the present disclosure by describing the embodiments of the present invention with specific embodiments thereof in conjunction with the accompanying drawings. The invention is capable of other and different embodiments and its several details are capable of modification in various other respects, all without departing from the spirit and scope of the present invention.
Fig. 1 is a system architecture diagram of a system for virtual experiment of characteristics of a current relay according to the present invention. As shown in fig. 1, the present invention provides a system for virtual experiment of current relay characteristics, comprising:
and the device virtual module 101 is used for generating virtual elements corresponding to the real elements according to a simulation of a current relay characteristic experiment schematic diagram, connecting the virtual elements according to the schematic diagram to generate a virtual circuit, and providing settings of parameters of the virtual elements in the virtual circuit.
Fig. 2 is a schematic diagram of a virtual circuit according to an embodiment of the present invention. Wherein, the virtual circuit is composed of a virtual voltage regulator TY1, a virtual slide wire resistor R, a virtual ammeter A, a virtual current relay KA and a virtual load (action signal lamp), the virtual voltage regulator TY1 is used for converting virtual 220V alternating current into low-voltage alternating current, the virtual slide wire resistor R is used for limiting the output current of the low-voltage alternating current, the virtual ammeter A is used for detecting the current value of the low-voltage alternating current, the virtual current relay KA is used for controlling high voltage, the virtual load (action signal lamp) is used for displaying the control effect of the virtual circuit, the virtual 220V alternating current live wire zero line is respectively connected to the primary end a/o of the virtual voltage regulator TY1, the virtual low-voltage alternating current is output from the secondary tap of the virtual voltage regulator TY1 and is connected to one end of the virtual slide wire resistor R, the other end (namely the sliding contact end) of the virtual slide wire resistor R is connected to one control end of the virtual current relay KA through the virtual ammeter, the other control terminal of virtual current relay KA and the secondary ground of virtual voltage regulator TY1 are connected to the primary ground o of virtual voltage regulator TY 1. In the invention, a tap of a virtual voltage regulator is initially arranged at 0V, a sliding contact of a virtual slide wire resistor R is initially arranged at the middle position of the slide wire resistor, whether a line is correctly connected is checked, a virtual three-phase power switch is turned on after the line is checked to be correct, a corresponding virtual three-phase power indicator lamp is turned on, a virtual single-phase power switch and a virtual direct-current power switch are turned on, and the virtual circuit is operated.
After generating the virtual circuit as shown in fig. 2, the setting of each virtual element parameter can be provided, and in the present embodiment, for example, for a virtual current relay, the settable parameter includes, but is not limited to, the number of turns N of the relay coilKAReaction moment M of the springSReluctance R of a magnetic circuit through which magnetic flux passesCWhen the test experiment of the virtual current relay action and the return current value is finished, the action value of the virtual current relay is preset and can be set to be 1A, and the output indication of the virtual voltage regulator is 0V.
The adjusting module 102 is configured to adjust a virtual current magnitude or a relay parameter value of the virtual circuit, where adjusting the virtual current magnitude tests a virtual current relay current action value and a current return value, the start condition achievement processing module 104 monitors a virtual current trigger condition to record the current action value and the current return value, and adjusts the relay parameter value to change the relay current action value and the return value. In an embodiment of the present invention, the adjusting module 102 may slowly increase the current value by adjusting the virtual current of the virtual circuit, and record the minimum current value when the virtual current relay just operates, that is, the operating value, specifically, the adjusting module 102 may slowly increase the current by slowly increasing the voltage of the virtual voltage regulator or decreasing the resistance value of the virtual trolley resistor, after the virtual current relay operates, the adjusting module 102 may smoothly decrease the current value by adjusting the virtual current of the virtual circuit, and record the maximum current value when the virtual current relay returns, that is, the return value, and similarly, the adjusting module 102 may slowly decrease the current by slowly decreasing the voltage of the virtual voltage regulator or increasing the resistance value of the virtual trolley resistor. The adjusting module 102 may adjust the number of turns N of the relay coilKAReaction moment M of springSReluctance R of a magnetic circuit through which magnetic flux passesCThe relay current operating value and the return value are changed according to the parameter.
Specifically, the adjusting module 102 includes a fine adjusting module and a step adjusting module, wherein the fine adjusting module is a function of implementing fine adjustment of the numerical value, for example, by providing a parameter window for a user to directly key in a new numerical value; the step-by-step adjusting module comprises an automatic mode, a mouse mode and a keyboard mode, for adjusting the virtual current, the automatic mode can set an initial current, a change time interval and a change step length after initializing the virtual circuit, namely, the function of increasing or decreasing corresponding parameter values according to a certain step length every time at a certain time interval from a preset parameter initial value is realized, the mouse mode and the keyboard mode provide mouse dragging or set keyboard shortcut key realization, the parameter increasing module and the parameter decreasing module are included, the increasing or decreasing process is realized by dragging or pressing the set keyboard shortcut key through the mouse, the mouse is dragged once or the mouse is pressed once, and the corresponding parameter values can increase or decrease corresponding change amplitude values.
And a current presenting module 103, configured to obtain a current of the virtual circuit according to parameter adjustment of the adjusting module 102 and present the current.
In an embodiment of the present invention, the current presenting module 103 presents the virtual current value change condition abstractly by color and sound variables, and visually presents the virtual current value change condition by numerical values and image variables. Specifically, the current presenting module 103 includes a sound presenting module, a color presenting module, a numerical value presenting module, and an image presenting module, wherein the sound presenting module is configured to present the magnitude of the current according to the level of the sound; the color presentation module is used for presenting the magnitude of the current by the shade of the color; the numerical value presentation module is used for directly presenting the current value by using a number; the image presentation module is used for presenting the ratio of the current to the action value or the return value, wherein the sound presentation module and the color presentation module belong to abstract expression, and the numerical value presentation module and the image presentation module are visual expression.
The condition achievement processing module 104 is configured to monitor whether the virtual current trigger condition is achieved, that is, determine whether the current reaches an action value or a return value, trigger the recording module if the determination result is yes, and execute externalization of action or return of the real current relay and turn on or off of the indicator light.
In the present invention, the condition achievement processing module 104 includes a judgment statement module and a characteristic expression module, the judgment statement module is used for judging whether the current reaches an action value or a return value, and the characteristic expression module executes an externalization expression of the action or the return of the real current relay and the on/off of the indicator light when the judgment statement module judges "YES".
Specifically, in the process of testing the virtual current relay current action value, when a virtual current trigger condition is achieved (a current action value judgment statement), the trigger recording module records the value as the action value at the moment, executes the virtual relay action in the characteristic expression, holds the virtual armature, closes the virtual contact, and enables the virtual action signal lamp XD1 to be on; in an embodiment of the present invention, the current action value determination statement is:
i.e. the mean electromagnetic moment MeMust be greater than the sum of the reaction moments (M) of the spring and the frictionS+ M). When current I passes through the coilKAAfter a certain value is reached, the above formula can be established, namely, the virtual current relay in the characteristic expression is executed to act, the virtual armature is held, and the virtual contact is closed, so that the virtual action signal lamp XD1 is lightened;
in the process of testing the return current value of the virtual current relay, when a virtual current trigger condition is achieved (a current return value judgment statement), the virtual current relay in the characteristic expression is executed to return, the actuated virtual current relay returns to the initial position under the action of the virtual spring force, and the virtual action signal lamp XD1 is turned off, wherein in the specific embodiment of the invention, the current return value judgment statement is as follows:
i.e. spring action moment M'sMust be greater than electromagnetic torque M'eAnd a frictional reaction torque M'. When current I passes through the coilKAAfter the value is reduced to a certain value, the above equation can be satisfied,and (4) returning the virtual current relay in the execution characteristic expression, returning the actuated virtual current relay to the initial position under the action of the virtual spring force, and extinguishing the virtual action signal lamp XD 1.
And the recording module 105 is used for recording the action/return current value in the experimental process, analyzing the experimental data, obtaining and outputting results such as errors, variations, return coefficients and the like.
Fig. 3 is a flowchart illustrating steps of a method for implementing a system for virtual experiments of characteristics of a current relay according to the present invention. As shown in fig. 3, the implementation method of the system for virtual experiment of current relay characteristics of the present invention includes the following steps:
and step S1, generating virtual elements corresponding to the real elements according to the simulation of the current relay characteristic experiment schematic diagram, connecting the virtual elements according to the schematic diagram to generate virtual circuits, and providing the setting of parameters of the virtual elements in the virtual circuits.
Fig. 2 is a schematic diagram of a virtual circuit according to an embodiment of the present invention. The virtual circuit comprises a virtual voltage regulator TY1, a virtual slide wire resistor R, a virtual ammeter A, a virtual current relay KA and a virtual load (action signal lamp), wherein the virtual voltage regulator TY1 is used for converting virtual 220V alternating current into low-voltage alternating current, the virtual slide wire resistor R is used for limiting the output current of the low-voltage alternating current, the virtual ammeter A is used for detecting the current value of the low-voltage alternating current, the virtual current relay KA is used for controlling high voltage of the low-voltage alternating current, the virtual load (action signal lamp) is used for displaying the control effect of the virtual circuit, virtual 220V alternating current live wire zero lines are respectively connected to the primary ends a/o of the virtual voltage regulator TY1, the virtual low-voltage alternating current is output from a secondary tap of the virtual voltage regulator TY1 and is connected to one end of the virtual slide wire resistor R, and the sliding end contact of the virtual slide wire resistor R is connected to one control end of the virtual current relay KA through the virtual ammeter, the other control terminal of virtual current relay KA and the secondary ground of virtual voltage regulator TY1 are connected to the primary ground o of virtual voltage regulator TY 1. In the invention, a tap of a virtual voltage regulator is initially arranged at 0V, a sliding contact of a virtual slide wire resistor R is initially arranged at the middle position of the slide wire resistor, whether a line is correctly connected is checked, a virtual three-phase power switch is turned on after the line is checked to be correct, a corresponding virtual three-phase power indicator lamp is turned on, a virtual single-phase power switch and a virtual direct-current power switch are turned on, and the virtual circuit is operated.
After the virtual circuit is generated, the setting of each virtual element parameter is also provided, in the embodiment, for example, for a virtual current relay, the settable parameter includes, but is not limited to, the number of turns N of the relay coilKAReaction moment M of the springSReluctance R of a magnetic circuit through which magnetic flux passesCWhen the test experiment of the virtual current relay action and the return current value is finished, the action value of the virtual current relay is preset and can be set to be 1A, and the output indication of the virtual voltage regulator is 0V.
And step S2, adjusting the virtual current of the virtual circuit, testing the current action value and the current return value of the virtual current relay, and adjusting the relay parameter value to finish multiple tests.
Specifically, step S2 further includes:
step S200, the current value is slowly increased by adjusting the virtual current of the virtual circuit, and the minimum current value when the virtual current relay just operates is recorded, that is, the current operation value, specifically, in step S200, the current can be slowly increased by slowly increasing the voltage of the virtual voltage regulator or decreasing the resistance value of the virtual slide resistor, when the current operation value judgment statement is reached, the value at this time is recorded as the current operation value, and the current operation value judgment statement is:
i.e. the mean electromagnetic moment MeMust be greater than the sum of the reaction moments (M) of the spring and the frictionS+ M). When current I passes through the coilKAAfter a certain value is reached, the above formula can be established, namely a current action value judgment statement is achieved, the current value at the moment is recorded as the current action value, the virtual relay action in the characteristic expression is executed, the virtual armature is held, and the virtual contact is closed to enable a virtual action signalThe lamp XD1 was lit.
Step S201, after the virtual current relay acts, the virtual current of the virtual circuit is adjusted to smoothly reduce the current value, and the maximum current value when the virtual current relay returns is recorded, that is, the current return value, specifically, in step S201, the current can be slowly reduced by slowly reducing the voltage of the virtual voltage regulator or increasing the resistance value of the virtual trolley resistor, when the current return value judgment statement is reached, the maximum current value when the virtual current relay returns is recorded as the current return value, and the current return value judgment statement is:
i.e. spring action moment M'sMust be greater than electromagnetic torque M'eAnd a frictional moment of action M' when a current I is passed through the coilKAAfter the current value is reduced to a certain value, the above formula can be satisfied, namely, the current return value judgment statement is achieved, the virtual current relay in the characteristic expression is executed to return, the actuated virtual current relay returns to the initial position under the action of the virtual spring force, and the virtual action signal lamp XD1 is turned off.
Step S202, changing partial parameters of the virtual current relay to increase the current action value (setting value) and the return value of the virtual current relay, and returning to step S200 to obtain data for a plurality of times. In the embodiment of the present invention, the current action value and the current return value may be set in one of the following manners: (1) reducing the number of turns N of a relay coilKA(ii) a (2) Increasing the reaction moment M of the springS(ii) a (3) Increasing the reluctance RC。
And step S3, obtaining the current of the virtual circuit in real time according to the parameter adjustment of the step S2 and presenting the current. In step S3, the virtual current value variation is abstractly represented by color and sound variables, and the virtual current value variation is visually represented by numerical values and image variables.
In step S4, the action/return current values during the experiment are recorded and the experimental data are analyzed to obtain and output the results of error, variation, return coefficient, and the like.
Examples
In this embodiment, as shown in fig. 4, the implementation process of the present invention is as follows:
step 1, generating virtual elements corresponding to all real object elements on a virtual system according to a wiring schematic diagram of a virtual experimental system of a current relay by utilizing the invention, and connecting all virtual elements according to the schematic diagram to generate a virtual circuit, as shown in fig. 2, wherein a tap of a virtual voltage regulator is initially arranged at 0V, a sliding contact of a virtual slide wire resistor R is initially arranged at the middle position of the slide wire resistor, whether the circuit is correctly connected is checked, the virtual three-phase power switch is closed after the circuit is checked to be correct, a corresponding virtual three-phase power indicator lamp is lightened, and then the virtual single-phase power switch and the virtual direct-current power switch are closed.
And 2, modifying the parameters of the virtual element. In the embodiment, the virtual object is a DL series current relay, and the modifiable parameter of the virtual object is the number N of turns of a relay coilKAReaction moment M of the springSReluctance R of a magnetic circuit through which magnetic flux passesC. When the virtual current relay action and the return current value test experiment are completed, the action value of the virtual current relay is preset and can be set to be 1A, and the output indication of the virtual voltage regulator is 0V.
And 3, the current presentation module comprises appearance presentation and abstract presentation. The presentation mode includes a numerical presentation mode and an image presentation mode. The numerical value is presented, namely a parameter window is arranged beside the virtual element to directly represent the current parameter value in a digital form, and the number of bits after a decimal point is reserved during initialization can be set so as to improve the accuracy; the image presentation is represented by the position of a pointer in the dial, the measuring range of the dial is a numerical value which is slightly larger than the current action value of the set virtual current relay from the current initial value, and the image presentation is more capable of seeing the difference value between the current value and the current action value than the numerical value presentation, thereby being beneficial to subsequent current adjustment. The abstract representation is realized by sound and color variables, namely a sound representation module and a color representation module. The sound presenting module represents the magnitude of the current by using the sound level, and the sound level variation can be expressed by the following formula:
volume＝present_current*coefficient+base_current，
coefficient is a constant-increment coefficient set when the virtual system is initialized, and base _ current is an initial value of volume decibel set when the virtual system is initialized, so that the larger the current value is, the larger the volume of sound is. The color rendering module expresses the current by the shade of the color, and the shade change of the color can be expressed by the following formula:
colour＝present_current*coefficient+base_current，
a virtual ammeter ground color can be set when a virtual system is initialized, and the color of the ammeter is darker when the current value is larger. The four current presenting modules can be freely matched and operated simultaneously.
And 4, operating the adjusting module to change the current value of the circuit.
The adjusting module comprises accurate adjustment and step adjustment. The precise adjustment is to change the parameter value directly, and the step adjustment is to change the value step by step along a certain change trend. The precise adjustment can be realized by entering the parameter window and directly typing in a new numerical value; the step-by-step adjustment can be achieved by an automatic mode, a mouse mode or a keyboard mode. For automatic mode, the system may have a step size l for a particular parameter after initialization, the initial value of which is a0And setting a parameter change time interval tau, the value of the parameter
There is an expression which varies automatically with the same amplitude over a fixed time interval
L is required to be less than or equal to 0.03a0，n1The number of times of the experienced fixed time interval tau is, the sign of the time interval is determined by pressing down commands "↓" "and ↓" on the keyboard before the change starts, if the change trend is increased, pressing down "↓" executes "+", and if the change trend is decreased, "↓" is pressed down to execute "-".For the mouse mode, one side of the virtual element in the system is provided with a horizontal bar scale which can be dragged by a mouse, the horizontal bar scale is abstract expression of a certain parameter value of the virtual element, the horizontal bar scale is provided with a plurality of groups of uniform intervals d, and the initial value of the parameter is set to be b after the system is initialized0The parameter value is obtained every time the mouse is dragged
Varying by the amplitude d, an expression can be used
D is required to be less than or equal to 0.03b0，n2The number of times that the horizontal bar scale is dragged by the mouse is determined, the sign is dragged to the right or left by the mouse, if the change trend is increased, the horizontal bar scale is dragged to the right to execute "+", if the change trend is decreased, the horizontal bar scale is dragged to the left to execute "-". For keyboard mode, the parameter values of virtual components in the system can be adjusted by pressing a specific key on the keyboard. Setting the initial value of the parameter to be c after initializing the system0Fixed amplitude x, the value of the parameter being changed each time a key is pressed
Varying by amplitude x, an expression can be used
X is required to be less than or equal to 0.03c0，n3The key is pressed for times, the sign is determined by the pressed key, if the trend is increasing, the plus key is pressed to execute the plus, if the trend is decreasing, the minus key is pressed to execute the minus.
And 5, testing the action current value of the virtual current relay. And slowly adjusting the current to slowly increase the current value, and recording the minimum current value when the virtual current relay just operates, namely the operation value. The current may be ramped up slowly by slowly increasing the virtual regulator voltage or decreasing the virtual trolley resistance value.
Step 6, if the method of accurately adjusting the voltage U of the virtual voltage regulator is adoptedMethod, assuming that the current virtual voltage value is U0If yes, open the parameter window and enter the value U1＝1.03U0The virtual voltage value is directly adjusted to be continuously increased, U2＝1.03U1… …, the virtual voltage value is slowly increased, so that the virtual current slowly rises. If the step-by-step adjustment method is adopted, an automatic mode is operated, and the step length l is set to be 1.03U after the virtual system is initialized0Setting parameter variation time interval tau, pressing "speak" button, then
n1Is the number of elapsed fixed time intervals τ, the virtual voltage value increases slowly, and the current rises slowly. If the mouse mode is operated, after the virtual system is initialized, the uniform interval d is set to be 0.03U for the horizontal bar ruler0Mouse dragging right once, U1＝U0+ d, the mouse is dragged right again, U2＝U0+d×2，……，
n2The virtual voltage value is slowly increased by the number of times that the horizontal bar scale is dragged to the right by the mouse, so that the current is slowly increased. If the keyboard mode is operated, after the virtual system is initialized, a fixed change amplitude x is set to be 0.03U0Pressing the "+" button, U1＝U0+ x, press the "+" button again, U2＝U0+x×2，……，
n3Is the number of times the key "+" is pressed, the virtual voltage value increases slowly, so that the current rises slowly.
Step 7, if a method for accurately adjusting the resistance value R of the virtual slide wire resistor is adopted, assuming that the resistance value R of the virtual slide wire resistor is0Then open the parameter window and enter the value R1＝0.97R0The resistance value of the virtual slide wire resistor is directly adjusted to be continuously reduced, R2＝0.97R1… …, making the virtual trolley resistance slowBecomes small and the current rises slowly. If the step-by-step adjustment method is adopted, an automatic mode is operated, and the step length l is set to be 0.03R after the virtual system is initialized0And setting a parameter change time interval tau, and pressing a key of "↓" to obtain the final product
n1Is the number of times of the elapsed fixed time interval τ, the virtual trolley resistance value slowly becomes smaller, and the current slowly increases. If the mouse mode is operated, after the virtual system is initialized, the uniform interval d is set to be 0.03R for the horizontal bar ruler0Mouse is dragged left once, R1＝R0D, mouse drag once more to the left, R2＝R0-d×2，……，
n2The frequency of dragging the horizontal bar ruler to the left by the mouse is shown, the resistance value of the virtual slide wire resistor is slowly reduced, and therefore the current is slowly increased. If the keyboard mode is operated, after the virtual system is initialized, the fixed change amplitude x is set to be 0.03R0Pressing the "-" key, R1＝R0X, press the "-" key again, R2＝R0-x×2，……，
n3The number of times that the key "-" is pressed is the same, the resistance value of the virtual slide wire resistor is slowly reduced, and thus the current is slowly increased.
And 8, when the virtual current trigger condition is achieved, recording the value at the moment as an action value. The condition achievement module consists of a judgment statement module and a characteristic expression module. In the testing of the virtual current relay action current value, the current action value judgment statement is as follows:
mean electromagnetic moment MeMust be greater than the sum of the reaction moments (M) of the spring and the frictionS+ M). When coilIn the current I passing throughKAAfter a certain value is reached, the above formula can be established, the judgment statement "YES" executes the action of the virtual relay in the characteristic expression module, the virtual armature is held, and the virtual contact is closed to enable the virtual action signal lamp XD1 to be on.
And 9, performing a virtual current relay characteristic experiment to test the return current value of the virtual current relay. After the virtual current relay acts, the voltage regulator is adjusted to enable the current value to be reduced smoothly, and the maximum current value when the virtual current relay returns is recorded, namely the return value. The current may be slowly decreased by slowly decreasing the virtual regulator voltage or increasing the virtual trolley resistance value.
Step 10, if a method for precisely adjusting the voltage U of the virtual voltage regulator is adopted, assume that the current virtual voltage value is U0If yes, open the parameter window and enter the value U1＝0.97U0The virtual voltage value is directly adjusted to be continuously reduced, U2＝0.97U1… …, the virtual voltage value is made to slowly decrease so that the virtual current slowly decreases. If the step-by-step adjustment method is adopted, an automatic mode is operated, and the step length l is set to be 0.03U after the virtual system is initialized0And setting a parameter change time interval tau, and pressing the key "↓" then
n1Is the number of elapsed fixed time intervals τ, the virtual voltage value decreases slowly, and the current drops slowly. If the mouse mode is operated, after the virtual system is initialized, the uniform interval d is set to be 0.03U for the horizontal bar ruler0Mouse dragging once to the left, U1＝U0D, mouse drag once more to the left, U2＝U0-d×2，……，
n2The virtual voltage value is slowly reduced by the times that the horizontal bar scale is dragged leftwards by the mouse, so that the current is slowly reduced. If the keyboard mode is operated, after the virtual system is initialized, a fixed change amplitude x is set to be 0.03U0Pressing the "-" button, U1＝U0X, press the "-" key again, U2＝U0-x×2，……，
n3Is the number of times the key "-" is pressed, the virtual voltage value decreases slowly, so that the current decreases slowly.
Step 11, if the method of precisely adjusting the resistance R of the virtual slide wire resistor is adopted, assume that the resistance R of the virtual slide wire resistor R is equal to the resistance R of the virtual slide wire resistor R0Then open the parameter window and enter the value R1＝1.03R0Directly adjusting the resistance value of the virtual slide wire resistor, continuously increasing the resistance value of the virtual slide wire resistor, and R2＝1.03R1… …, the virtual trolley resistance value is slowly increased, so that the current slowly decreases. If the step-by-step adjustment method is adopted, an automatic mode is operated, and the step length l is set to be 0.03R after the virtual system is initialized0Setting parameter change time interval tau, pressing "← key", then
n1Is the number of elapsed fixed time intervals τ, the virtual trolley resistance value increases slowly, so that the current decreases slowly. If the mouse mode is operated, after the virtual system is initialized, the uniform interval d is set to be 0.03R for the horizontal bar ruler0Mouse is dragged right once, R1＝R0+ d, the mouse is dragged right again, R2＝R0+d×2，……，
n2The frequency of dragging the horizontal bar ruler by the mouse is shown, the resistance value of the virtual slide wire resistor is slowly increased, and thus the current is slowly reduced. If the keyboard mode is operated, after the virtual system is initialized, the fixed change amplitude x is set to be 0.03R0Pressing the "+" button, R1＝R0+ x, press the "+" button again, R2＝R0+x×2，……，
n3Is the number of times that the key "+" is pressed, the resistance of the virtual slide wire resistor is slowly increased, and thus the current is slowly reduced.
And step 12, when the virtual current trigger condition reaches the module, recording the value at the moment, namely the return value. In the test of the return current value of the virtual current relay, the current action value judgment statement is as follows:
wherein, the action moment M 'of the spring'sMust be greater than electromagnetic torque M'eAnd a frictional reaction torque M'. When current I passes through the coilKAAfter the value is reduced to a certain value, the above formula can be established, the judgment statement "YES" executes the return of the virtual relay in the characteristic module, the actuated virtual current relay returns to the initial position under the action of the virtual spring force, and the virtual actuation signal lamp XD1 is turned off.
The characteristic expression module in the condition achievement module is not fixed, and a virtual action signal lamp can be set to be bright after the virtual system is initialized, so that IKAWhen the rising to the action current value expresses as that the virtual action signal lamp XD1 goes out, I is setKAThe decrease from the operation current value to the return value is expressed as the virtual operation signal lamp XD1 being on.
And 13, repeating the steps 6-13 to obtain three groups of data. The virtual element part parameters are changed to increase the current action value (i.e. the setting value) and the return value of the virtual current relay, and the process returns to step 6 again.
Specifically, the minimum current that can operate the relay is called the relay operating current, IOPRepresents:
the maximum current which can be returned by the virtual current relay is called the return current of the virtual current relay, and is IreRepresents:
as can be seen from the above equation, the operating current value and the return current value can be set in the following manner: (1) change number of turns N of relay coilKA(ii) a (2) Varying the reaction moment M of the springS(ii) a (3) Varying reluctance RC。
1) If the number of turns N of the relay coil is accurately adjustedKAThe method of (3) changes the relay action current or the return current value. Assume the current coil turn number NKA0Then open the parameter window to enter the value NKA1＝0.97NKA0Directly adjusting the number of turns of the coil, continuously reducing the number of turns of the coil, NKA2＝0.97NKA1… …, the number of turns of the relay coil is slowly reduced, and the set current value is slowly increased. If the method of step-by-step adjustment is adopted, a mouse mode is operated, and after a virtual system is initialized, the uniform interval d of the horizontal bar ruler is set to be 0.03NKA0Mouse dragging left once, NKA1＝NKA0D, mouse drag once more to the left, NKA2＝NKA0-d×2，……，
n2The number of times that the mouse drags the horizontal bar ruler to the left is increased, the number of turns of the relay coil is slowly reduced, and therefore the set current value is slowly increased. If the keyboard mode is operated, after the virtual system is initialized, a fixed change amplitude x is set to be 0.97NKA0Pressing the "-" button, NKA1＝NKA0X, press the "-" key again, NKA2＝NKA0-x×2，……，
n3The number of times that the key is pressed is the "-", the number of turns of the relay coil is slowly reduced, and thus the setting current value is slowly increased.
2) If the reaction moment M of the spring is accurately adjustedSBy varying relay action current or returnThe current value. Assuming that the magnitude of the reaction moment of the current spring is MS0If yes, open the parameter window and enter the value MS1＝1.03MS0The reaction moment of the spring is directly adjusted to be increased, and M isS2＝1.03MS1… …, the reaction torque of the spring is increased slowly, so that the set current value is increased slowly. If the method of step-by-step adjustment is adopted, a mouse mode is operated, and after a virtual system is initialized, the uniform interval d of the horizontal bar ruler is set to be 0.03MS0Mouse is dragged right once, MS1＝MS0+ d, the mouse is dragged once more to the right, MS2＝MS0+d×2，……，
n2The frequency of dragging the cross bar scale rightward by the mouse is adopted, the reaction torque of the spring is slowly increased, and therefore the set current value is slowly increased. If the keyboard mode is operated, after the virtual system is initialized, a fixed change amplitude x is set to be 1.03MS0Pressing the "+" button, MS1＝MS0+ x, press the "+" button again, MS2＝MS0+x×2，……，
n3The number of times that the "+" key is pressed is the same, the reaction torque of the spring is slowly increased, and thus the setting current value is slowly increased.
3) If precise adjustment is adopted to change the magnetic resistance RCThe method of (3) changes the relay action current or the return current value. Assuming that the current magnetoresistive resistance value is RC0Then open the parameter window and enter the value RC1＝1.03RC0Directly adjusting the resistance value of the magnetic resistance, the resistance value of the magnetic resistance is continuously increased, RC2＝1.03RC1… …, the reluctance resistance value is made gradually larger, and the setting current value is made gradually larger. If the method of step-by-step adjustment is adopted, a mouse mode is operated, and after a virtual system is initialized, the uniform interval d of the horizontal bar ruler is set to be 0.03RC0Mouse is dragged right once, RC1＝RC0+ d, the mouse is dragged right again, RC2＝RC0+d×2，……，
n2The frequency of dragging the horizontal bar ruler by the mouse is increased, the resistance value of the magnetic resistance is increased slowly, and the setting current value is increased slowly. If the keyboard mode is operated, after the virtual system is initialized, a fixed change amplitude x is set to be 1.03RC0Pressing the "+" button, RC1＝RC0+ x, press the "+" button again, RC2＝RC0+x×2，……，
n3The number of times that the key '+' is pressed is the same, the magnetic resistance value is slowly increased, and therefore the setting current value is slowly increased.
And step 14, after the experiment is finished, enabling the output of the virtual voltage regulator to be 0V, and disconnecting all virtual power switches.
Step 15, in the experimental process, recording and outputting the following experimental results: respectively calculating the average value of the action value and the return value, namely the action current value and the return current value of the virtual current relay; and calculating the error, the variation and the return coefficient of the setting value. Wherein the error is [ action minimum-setting ]/setting; variation [ action maximum value-action minimum value ]/action average value × 100%; the return coefficient is the return average value/action average value.
In summary, the system for virtual experiment of current relay characteristics and the implementation method thereof generate the virtual power equipment in the form of the virtual system, simulate the operation state of the physical power equipment corresponding to the virtual power equipment, a virtual circuit is formed by connecting according to a schematic diagram, the virtual current is adjusted, the change condition of the virtual current value is abstractly presented by color and sound variables, the change condition of the virtual current value is visually presented by numerical values and image variables, and meanwhile, the physical phenomenon that the virtual current reaches the action value and the return value is simulated, experimental data are automatically recorded and analyzed in the experimental process, and a result is given, so that the influence of various parameter changes of the current relay on the action current and the return current is simulated by using a virtual technology, the safety of the characteristic experiment of the current relay can be ensured, and the limitation of experimental time and space can be eliminated.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be as set forth in the claims.
Claims (8)
1. A system for virtual experiment of current relay characteristics, comprising:
the device virtual module is used for generating virtual elements corresponding to the real elements according to simulation of a current relay characteristic experiment principle diagram, connecting the virtual elements according to the principle diagram to generate a virtual circuit, and providing setting of parameters of the virtual elements in the virtual circuit;
the adjusting module is used for adjusting the virtual current magnitude or the relay parameter value of the virtual circuit, wherein the virtual current magnitude is adjusted to test the virtual current relay current action value and the current return value, the starting condition achieving processing module monitors the virtual current trigger condition to record the current action value and the current return value, and the relay parameter value is adjusted to change the relay current action value and the return value;
the current presentation module is used for acquiring the current of the virtual circuit in real time according to the parameter adjustment of the adjustment module and presenting the current;
the condition achievement processing module is used for monitoring whether the virtual current triggering condition is achieved or not, judging whether the current of the virtual circuit reaches an action value or a return value or not, triggering the recording module when the judgment result is yes, and simultaneously executing externalization expression of action or return of the real current relay;
the recording module is used for recording the action/return current value in the experimental process and analyzing the experimental data;
wherein the virtual circuit comprises a virtual voltage regulator, a virtual slide wire resistor, a virtual ammeter, a virtual current relay and a virtual load, the virtual voltage regulator is used for converting virtual 220V alternating current into low-voltage alternating current, the virtual slide wire resistor is used for limiting the output current of the low-voltage alternating current, the virtual ammeter is used for detecting the current value of the low-voltage alternating current, the virtual current relay is used for finishing the purpose of controlling the high voltage of the low-voltage alternating current, the virtual load is used for displaying the control effect of the virtual circuit, the virtual 220V alternating current live wire zero line is respectively connected to the primary end of the virtual voltage regulator, the virtual low-voltage alternating current is output from a secondary tap of the virtual voltage regulator and is connected to one end of the virtual slide wire resistor, the slide wire contact end of the virtual slide wire resistor is connected to one control end of the virtual current relay through the virtual ammeter, and the other control end of the virtual current relay and the secondary ground end of the virtual voltage regulator are connected to the primary ground end of the virtual voltage regulator;
the adjusting module is used for testing a current action value and a current return value of the virtual current relay by adjusting the voltage of the virtual voltage regulator or the resistance value of the virtual slide wire resistor; the adjusting module is further configured to adjust the number of turns N of the virtual current relay coil by changing the number of turns N of the virtual current relay coilKAReaction moment M of springSMagnetic resistance RCThereby changing the current action value and the return value of the virtual current relay;
the condition achievement processing module comprises a judgment statement module and a characteristic expression module; the judgment statement module is used for judging whether the current reaches an action value or a return value; the characteristic expression module is used for executing the action of the real current relay or the externalized representation of the return and the on-off of the indicator light when the judgment statement module judges as 'YES', and specifically comprises the following steps:
in the process of testing the current action value of the virtual current relay, when a current action value judgment statement is achieved, the trigger recording module records the value as an action value at the moment, the virtual relay action in the characteristic expression is executed, the virtual armature is held, and the virtual contact is closed to enable a virtual action signal lamp XD1 to be lightened;
in the process of testing the return current value of the virtual current relay, when a current return value judgment statement is achieved, the virtual current relay in the execution characteristic expression returns, the actuated virtual current relay returns to the initial position under the action of the virtual spring force, and the virtual action signal lamp XD1 is turned off.
2. The system for virtual experiment of characteristics of current relay according to claim 1, wherein: the tap of the virtual voltage regulator is initially arranged at 0V, the sliding contact of the virtual slide wire resistor is initially arranged at the middle position of the slide wire resistor, and the corresponding switch is turned on after the circuit is checked to be error-free so as to operate the virtual circuit.
3. The system for virtual experiment of characteristics of current relay according to claim 1, wherein: the adjusting module increases the voltage of the virtual voltage regulator or reduces the resistance value of the virtual slide wire resistor to enable the current to rise slowly, and the minimum current value of the virtual current relay during the just-acting process is recorded as a current action value.
4. A system for virtual experiment of characteristics of current relay according to claim 3, characterized in that: the adjusting module enables the current to slowly decrease by reducing the voltage of the virtual voltage regulator or increasing the resistance value of the virtual slide wire resistor, and records the maximum current value when the virtual current relay returns as a current return value.
5. The system for virtual experiment of characteristics of current relay according to claim 1, wherein: the adjusting module comprises a precise adjusting module and a step adjusting module, the precise adjusting module is realized by providing a parameter window for a user to directly key in a new numerical value, the step adjusting module comprises an automatic mode, a mouse mode and a keyboard mode, the automatic mode is that corresponding parameter values are increased or decreased at a certain time interval from a preset initial parameter value according to a certain step length, and the mouse mode and the keyboard mode are realized by dragging a mouse or setting a keyboard shortcut key.
6. A method for realizing a system for virtual experiment of current relay characteristics is characterized in that the method is applied to the system for virtual experiment of current relay characteristics as claimed in any one of claims 1-5, and comprises the following steps:
step S1, generating virtual elements corresponding to the real elements according to the simulation of the current relay characteristic experiment schematic diagram, connecting the virtual elements according to the schematic diagram to generate virtual circuits, and providing the setting of parameters of the virtual elements in the virtual circuits;
step S2, adjusting the virtual current of the virtual circuit, testing the current action value and the current return value of the virtual current relay, and adjusting the relay parameter value to finish multiple tests;
step S3, obtaining the current of the virtual circuit in real time according to the adjustment of the virtual current in the step S2 for presentation;
in step S4, the action/return current value during the experiment is recorded, the experiment data is analyzed, and the analysis result is output.
7. The method for implementing the system for virtual experiment of characteristics of current relay according to claim 6, wherein the step S2 further comprises:
step S200, the current value is slowly increased by adjusting the virtual current of the virtual circuit, and the minimum current value of the virtual current relay during the just action is recorded, namely the current action value;
step S201, after the virtual current relay acts, the current value is reduced smoothly by adjusting the virtual current of the virtual circuit, and the maximum current value when the virtual current relay returns is recorded, namely the current return value;
step S202, changing partial parameters of the virtual current relay to increase the current action value and the return value of the virtual current relay, and returning to step S200 to obtain multiple groups of data.
8. The method of claim 7, wherein in step S202, the current action value and the current return value are set by one of the following methods: (1) changing the number of turns N of the virtual current relay coilKA(ii) a (2) Change stationReaction moment M of the virtual current relay springS(ii) a (3) Changing the virtual current relay reluctance RC。
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