CN111426877B - Method and system for checking power protection device - Google Patents
Method and system for checking power protection device Download PDFInfo
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Abstract
The invention provides a method and a system for checking a power protection device. The method comprises the following steps: collecting power data of a power protection device; performing data conversion processing on the power data to obtain the voltage rotation vector coordinate and the current rotation vector coordinate; drawing according to the obtained coordinates to obtain a phase pattern; the phase pattern pairs are used for verification. The system can comprise a data acquisition module, a processing module, a drawing module and a display module, wherein the data acquisition module can acquire the power data of the power protection device; the processing module can convert the electric power data into data and obtain a rotation vector coordinate; the drawing module can draw according to the coordinates and obtain a phase graph; the display module can display the phase graph. The invention can assist related users to clearly know the real-time status of the data of the current protection record, avoid meaningless mental labor and improve the efficiency in the aspects of equipment debugging, fault processing and the like.
Description
Technical Field
The present invention relates to the field of power system verification, and in particular, to a system and a method for verifying a power protection device.
Background
In the production of electrical power systems, personnel often need to deal with parameters such as voltage, phase, frequency, etc., especially on the protection devices. As three elements of alternating current, voltage and frequency are often displayed in a numerical form directly, which is very intuitive, but the parameter of phase is somewhat complicated, the meaning of phase is the position of a specific moment in the cycle, and the relation that three-phase alternating current waveform A, B, C with sine characteristics is expressed in a power system to lead or lag each other in a period time is expressed, because a power vector is a rotation amount and is always in a cycle state of chasing oneself from the beginning, the phase angle on a protection device alone is not meaningful, and the value of the three-phase alternating current waveform can be expressed only by comparing with other phases, for example: at a certain moment of normal power generation output power, the included angle (phase difference) between the phase voltage A and the phase current A in an inductive state is about 30 degrees (specifically determined according to power factors), and the phase voltage A is ahead of the phase current A (anticlockwise), at this time, the phase condition in the display data on the protection device needs a worker to draw an angle on a complex plane in the brain, and then whether the angle is normal is judged. This is not easy for most people, especially in the field of production commissioning.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to address one or more of the problems in the prior art as set forth above. For example, one of the purposes of the present invention is to solve the problem that the relay protection phase display is not intuitive enough in the power production field, and simultaneously assist the relevant personnel to analyze the protection fault so as to quickly lock the fault point.
In order to achieve the above object, an aspect of the present invention provides a method for checking a power protection device.
The method may comprise the steps of: collecting power data of a power protection device, wherein the power data comprises a voltage phase angle and a current phase angle of at least one of three phases; respectively carrying out data conversion processing on the power data by adopting a formula 1, a formula 2, a formula 3 and a formula 4 to obtain a voltage rotating vector coordinate and a current rotating vector coordinate of at least one phase in the three phases; drawing according to the voltage rotation vector coordinates and the current rotation vector coordinates to obtain a first phase graph; checking the phase relation of the voltage and the current by using the first phase diagram;
wherein, formula 1 is:
xu=getProperty(_root.c0,_x)+Math.cos((90-du) Math.PI/180) (getProperty (root.c0, _ width) -. DELTA.t)/2, wherein xuIs the abscissa of the voltage rotation vector coordinate, c0 is the center of the circle, duThe method comprises the steps of calculating a voltage phase angle, wherein delta t is a correction coefficient, getProperty (root.c0, x) is an abscissa of a circle center on an acquired interface, getProperty (root.c0, width) is the diameter of the acquired circle, Math.PI/180 is used for converting an angle and a radian, and Math.cos () is used for calculating a cosine value of an object in a bracket;
the formula 2 is:
yu=getProperty(_root.c0,_y)-Math.sin((90-du) Math.PI/180) (getProperty (root.c0, _ width) -. DELTA.t)/2, wherein yuThe method comprises the steps that a voltage rotation vector coordinate is used as a vertical coordinate, getProperty (root.c0, _ y) is used as a vertical coordinate for obtaining a circle center on an interface, and Math.sin () is used for calculating a sine value of an object in a bracket;
formula 3 is:
xi=getProperty(_root.c0,_x)+Math.cos((90-di) Math.PI/180) (getProperty (root.c0, _ width) -. DELTA.t)/2, wherein xiAs abscissa of the vector coordinate of the rotation of the current, diIs the current phase angle;
formula 4 is:
yi=getProperty(_root.c0,_y)-Math.sin((90-di) Math.PI/180) (getProperty (root.c0, _ width) -. DELTA.t)/2, wherein yiIs the ordinate of the current rotation vector coordinate.
Further, the first phase pattern may include: the pointer comprises a circle, a rectangular coordinate system and a plurality of groups of first-class pointers, wherein the circle is divided into four parts by the rectangular coordinate system, and the circle center is overlapped with the origin of the rectangular coordinate system; the number of the first type pointers is the same as the number of the phases of at least one phase of the three phases, and the first type pointers can correspond to one another, each group of the first type pointers comprises a voltage pointer corresponding to the voltage phase angle and a current pointer corresponding to the current phase angle, the voltage pointer takes the circle center as a starting point and takes the voltage rotation vector coordinate as an end point, and the current pointer takes the circle center as a starting point and takes the current rotation vector coordinate as an end point.
Further, the four divided parts of the circle may correspond to four quadrants.
Further, the method may further comprise the steps of: the power delivery is checked using the first phase map.
The invention also provides a method for checking the power protection device.
The method may comprise the steps of: collecting power data of a power protection device, wherein the power data comprises a voltage phase angle and a current phase angle of at least one of three phases; obtaining the difference value of the voltage phase angle and the current phase angle, and respectively carrying out data conversion processing on the difference value by adopting a formula 5 and a formula 6 to obtain the vector coordinate of the voltage current angle difference value of at least one phase in the three phases; drawing according to the voltage and current angle difference vector coordinates to obtain a second phase image; checking the power delivery condition by using the second phase pattern;
wherein, formula 5 is:
x1=getProperty(_root.c0,_x)+Math.cos((90-d1)*Math.PI/180)*(getProperty(_root.c0,_width)-△t)/2，
wherein x is1Is the abscissa of the vector coordinate of the voltage-current angle difference, c0 is the center of the circle, d1The difference value of the voltage phase angle and the current phase angle is obtained, delta t is a correction coefficient, getProperty (root.c0, x) is an abscissa of a circle center on an acquisition interface, getProperty (root.c0, width) is a diameter of the acquisition circle, Math.PI/180 is used for converting the angle and the radian, and Math.cos () is used for calculating a cosine value of an object in a bracket;
formula 6 is:
y1=getProperty(_root.c0,_y)-Math.sin((90-d1) Math.PI/180) (getProperty (root.c0, _ width) -. DELTA.t)/2, wherein y1Is the ordinate of the vector coordinate of the voltage and current angle difference value, getProperty (root.c0, y) is the ordinate of the center of a circle on the acquired interface, and Math.sin () is the positive coordinate of the object in the bracketThe chord value.
The invention further provides a checking method of the power protection device.
The method may comprise the steps of: collecting power data of a power protection device, wherein the power data comprises a voltage phase angle and a current phase angle of at least one of three phases; respectively carrying out data conversion processing on the power data by adopting the formula 1, the formula 2, the formula 3 and the formula 4 to obtain a voltage rotating vector coordinate and a current rotating vector coordinate of at least one phase in the three phases; obtaining the difference value of the voltage phase angle and the current phase angle, and respectively performing data conversion processing on the difference value by adopting the formula 5 and the formula 6 to obtain the vector coordinate of the voltage current angle difference value of at least one phase in the three phases; drawing according to the voltage rotation vector coordinate, the current rotation vector coordinate and the voltage and current angle difference value vector coordinate to obtain a third phase figure; the phase relationship of the voltage and current, and the power delivery are checked using the third phase diagram.
According to one or more exemplary embodiments of the method for checking a power protection device of the present invention, the method further includes the steps of: normalizing the power data to a numerical type prior to the data conversion process. Further, the method can also comprise the following steps: and judging whether the normalized data meets the limitation requirement or not, and carrying out data conversion processing under the condition of meeting the limitation requirement.
According to one or more exemplary embodiments of the method for checking a power protection device of the present invention, the method further includes the steps of: acquiring a first angle parameter capable of reflecting the mutual leading or lagging relation between three phases at the system side; acquiring a second angle parameter capable of reflecting the mutual leading or lagging relation between three phases on the unit side; performing data conversion processing on the first angle parameter and the second angle parameter to obtain two groups of rotation vector coordinate parameters; drawing according to the two groups of rotation vector coordinate parameters, and obtaining a system side angle graph and a unit side angle graph; and judging whether the system and the unit belong to the same power supply or not according to the system side angle graph and the unit side angle graph.
In another aspect, the present invention provides a verification system for a power protection device.
The system can comprise a data acquisition module, a processing module, a drawing module and a display module, wherein the data acquisition module can acquire electric power data of the electric power protection device, and the electric power data comprises a voltage phase angle and a current phase angle of at least one of three phases; the processing module comprises at least one of a first processing unit and a second processing unit, wherein the first processing unit can perform data conversion processing on the voltage phase angle and the current phase angle and obtain a voltage rotation vector coordinate and a current rotation vector coordinate of at least one phase of the three phases; the second processing unit can calculate the difference value of the voltage phase angle and the current phase angle, then data conversion processing is carried out on the difference value, and the vector coordinate of the voltage current angle difference value of at least one phase in the three phases is obtained; the drawing module can draw according to the coordinates obtained by the processing module and obtain a phase graph; the display module can display the phase graph.
In an exemplary embodiment of the checking system of the power protection device of the present invention, the first processing unit may further be capable of performing a normalization process on the voltage phase angle and current phase angle data before performing the data conversion process.
In an exemplary embodiment of the checking system of the power protection device of the present invention, the second processing unit may be further capable of normalizing the difference between the voltage phase angle and the current phase angle.
In an exemplary embodiment of the checking system of the power protection device of the present invention, the first processing unit or the second processing unit may further be configured to determine whether the normalized data meets a constraint requirement, and perform the data conversion process if the normalized data meets the constraint requirement.
In an exemplary embodiment of the checking system of the power protection device of the present invention, the phase pattern may include a circle and a plurality of sets of first type pointers and/or a plurality of second type pointers located in the circle, the circle is divided into four parts by a rectangular coordinate system, the four parts correspond to four quadrants, and a center of the circle coincides with an origin of the rectangular coordinate system, wherein the number of the sets of the first type pointers is the same as the number of phases of at least one of the three phases and can correspond to one another, each set of the first type pointers includes a voltage pointer corresponding to the voltage phase angle and a current pointer corresponding to the current phase angle, the voltage pointer uses a center of the circle as a starting point, the voltage rotation vector coordinate uses a center of the circle as an ending point, the current pointer uses the center of the circle as a starting point, and the current; the number of the second type pointers is the same as the number of the phases of at least one phase of the three phases and can correspond to one another, each second type pointer comprises an angle difference pointer corresponding to the difference, and the angle difference pointer takes the circle center as a starting point and the voltage and current angle difference vector coordinate as an end point.
In an exemplary embodiment of the checking system of the power protection device of the present invention, the drawing module may extend a length of the shielded pointer in a case where the voltage pointer and the current pointer coincide, and the display module may display the extension in real time.
In an exemplary embodiment of the checking system of the power protection device of the present invention, the orthogonal coordinate system in the phase diagram may include an X-axis and a Y-axis, a positive direction of the X-axis represents a positive reactive power, a negative direction represents a negative reactive power, a positive direction of the Y-axis represents a positive active power, and a negative direction of the Y-axis represents a negative active power.
In an exemplary embodiment of the checking system of the power protection device of the present invention, the data collection module is further capable of collecting: the system comprises a reaction system side three-phase system, a reaction unit side three-phase system and a reaction unit side three-phase system, wherein the reaction system side three-phase system comprises a first angle parameter and a second angle parameter, the first angle parameter is in a mutual leading or lagging relationship, and the second angle parameter is in a mutual leading or lagging relationship; the processing module further comprises a third processing unit, and the third processing unit can respectively perform data conversion processing on the first angle parameter and the second angle parameter to obtain two groups of rotation vector coordinate parameters; the drawing module can also draw according to the two groups of rotation vector coordinate parameters and obtain a system side angle graph and a unit side angle graph; the display module can also simultaneously display the system side angle graph and the unit side angle graph.
Compared with the prior art, the beneficial effects of the invention can include: the method can assist relevant users to clearly know the real-time condition of the data of the current protection record, avoid unnecessary mental labor, and improve the efficiency in the aspects of equipment debugging, fault handling and the like.
Drawings
The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 illustrates a flow diagram in an exemplary embodiment of a method of checking a power protection device;
FIG. 2 shows a schematic flow diagram in another exemplary embodiment of a method of checking a power protection device;
FIG. 3 shows a schematic flow diagram in yet another exemplary embodiment of a method of checking a power protection device;
FIG. 4 illustrates a schematic diagram in an exemplary embodiment of a verification system for a power protection device;
FIG. 5 illustrates another schematic diagram in an exemplary embodiment of a verification system for a power protection device;
FIG. 6 shows a schematic diagram of a first phase pattern with voltage and current fingers;
FIG. 7 shows a schematic diagram of a phase diagram with power case and quadrant identification;
fig. 8 shows a schematic of a phase pattern with a system side angle pattern and a set side angle pattern.
Detailed Description
Hereinafter, a checking method and a checking system of a power protection device of the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.
The invention provides a method for checking a power protection device.
In an exemplary embodiment of the method for checking a power protection device of the present invention, as shown in fig. 1, the method for checking a power protection device may include: steps S10, S20, S30, and S40.
Step S10 may include: and collecting power data of the power protection device. The power data may be data displayed by the power protection device, the power data including a voltage phase angle and a current phase angle of at least one of the three phases. The voltage and current phase angles may be angles of instantaneous states.
Step S20 may include: and performing data conversion processing on the power data to obtain a voltage rotation vector coordinate and a current rotation vector coordinate of at least one phase of the three phases. Wherein, data conversion treatment can be carried out by using formulas 1 to 4.
Step S30 may include: drawing according to the obtained coordinates, and obtaining a first phase pattern.
Step S40 may include: phase checking is performed using the first phase pattern. The on-site staff can analyze whether the current phase is accurate according to the relative relationship (such as the position relationship) of the voltage and the power angle on the first phase graph.
In this embodiment, formulas 1 to 4 can be respectively:
xu=getProperty(_root.c0,_x)+Math.cos((90-du)*Math.PI/180)*(getProperty(_root.c0,_width)-△t)/2，
yu=getProperty(_root.c0,_y)-Math.sin((90-du)*Math.PI/180)*(getProperty(_root.c0,_width)-△t)/2，
xi=getProperty(_root.c0,_x)+Math.cos((90-di)*Math.PI/180)*(getProperty(_root.c0,_width)-△t)/2，
yi=getProperty(_root.c0,_y)-Math.sin((90-di)*Math.PI/180)*(getProperty(_root.c0,_width)-△t)/2，
wherein x isi、yiAbscissa and ordinate, x, respectively, of the current rotation vector coordinateu、yuRespectively the abscissa and the ordinate of the current rotation vector coordinate, c0 the center of the circle, diIs the current phase angle, duFor the current phase angle, Δ t is a correction coefficient, getProperty (root.c0, _ x), getProperty (root.c0, _ y) are obtainedTaking the horizontal coordinate and the vertical coordinate of the center of a circle on the interface, taking getProperty (root.c0, width) as the diameter of the acquired circle, carrying out angle and radian conversion by Math.PI/180, and respectively calculating the cosine value and the sine value of the object in the bracket by Math.cos (), Math.sin ().
In this embodiment, the first phase pattern may include a circle and a rectangular coordinate system, and the circle is divided into four parts by the rectangular coordinate system. Preferably, the center of the circle may coincide with the origin of the coordinate system.
The first phase pattern may further comprise sets of pointers of a first type located within the circle, the number of sets of pointers of the first type being the same as the number of phases of at least one of said three phases and being able to correspond one to one, e.g. a phase and B phase correspond to two sets of pointers of the first type. Each set of first type pointers comprises a voltage pointer corresponding to the voltage phase angle and a current pointer corresponding to the current phase angle. The voltage indicator and the current indicator are started from the center of a circle, the current indicator is ended from the current rotation vector coordinate, and the voltage indicator is ended from the voltage rotation vector coordinate, such as the first phase diagram shown in fig. 6, where a in fig. 6 represents the voltage indicator and b represents the current indicator.
Further, the four parts of the circle divided by the rectangular coordinate system may correspond to four quadrants, for example, 4 quadrants as shown in fig. 7, the rectangular coordinate system includes an X axis and a Y axis, a positive direction of the X axis represents a positive reactive power, a negative direction represents a negative reactive power, a positive direction of the Y axis represents a positive active power, and a negative direction of the Y axis represents a negative active power. The worker can further judge the power transmission condition through the phase diagram, for example, the power transmission condition can be judged according to the quadrant, relative position relation, included angle and the like of the voltage indicator and the current indicator in the diagram.
In this embodiment, an angle scale may be marked on the circumference of the first phase pattern. Furthermore, the size of the angle represented by the pointer can be displayed on the first phase diagram, for example, by text. Further, the power transmission condition can be displayed on the first phase pattern through words.
In this embodiment, the method may further include the steps of: the difference between the voltage phase angle and the current phase angle is calculated. Further, the difference between the voltage phase angle and the current phase angle may also be displayed on the first phase pattern.
In another exemplary embodiment of the method for checking a power protection device of the present invention, as shown in fig. 2, the method for checking a power protection device may include: steps S10, S20 ', S30 ' and S40 '. Here, step S10 is the same as step S10 in the previous exemplary embodiment.
Step S20' includes: and acquiring a difference value of the voltage phase angle and the current phase angle, and performing data conversion processing on the difference value to obtain a voltage current angle difference value vector coordinate of at least one phase in the three phases. Among them, data conversion processing can be performed by formulas 5 and 6.
Step S30' includes: drawing according to the obtained coordinates, and obtaining a second phase pattern.
Step S40' includes: the obtained second phase pattern is used to determine the power transmission (i.e., whether there is a reactive power transmission).
In this embodiment, the second phase pattern may include a circle and a rectangular coordinate system, and the circle is divided into four parts by the rectangular coordinate system. Preferably, the center of the circle may coincide with the origin of the coordinate system.
The second phase diagram also comprises a plurality of second type pointers which are positioned in the circle, the number of the second type pointers is the same as the number of the phases of at least one phase in the three phases and can be in one-to-one correspondence, each second type pointer comprises an angle difference pointer corresponding to the difference, the angle difference pointer takes the circle center as a starting point and the voltage and current angle difference vector coordinate as an end point. The circle may be divided into four parts by a rectangular coordinate system, each part representing a quadrant.
Further, the second phase pattern may also show the power delivery situation by text.
In still another exemplary embodiment of the checking method of the power protection device of the present invention, the checking method of the power protection device may include:
step 1: the above-mentioned step S10;
step 2: the above-described steps S20 and S20';
and step 3: drawing according to the voltage rotation vector coordinate, the current rotation vector coordinate and the voltage and current angle difference value vector coordinate to obtain a third phase figure;
and 4, step 4: the phase relationship of the voltage and current, and the power delivery are checked using the third phase diagram.
In this embodiment, the third phase image may include two patterns, i.e., the first phase image and the second phase image described above.
Alternatively, the third phase pattern may be one pattern, that is, the third phase pattern includes: the pointer comprises a circle, a rectangular coordinate system, a plurality of groups of first-class pointers and a plurality of second-class pointers.
The circle is divided into four parts by the rectangular coordinate system, the four parts correspond to four quadrants, and the circle center coincides with the origin of the rectangular coordinate system.
The number of the first type pointers is the same as the number of the phases of at least one phase of the three phases, and the first type pointers can correspond to one another, each group of the first type pointers comprises a voltage pointer corresponding to the voltage phase angle and a current pointer corresponding to the current phase angle, the voltage pointer takes the circle center as a starting point and takes the voltage rotation vector coordinate as an end point, and the current pointer takes the circle center as a starting point and takes the current rotation vector coordinate as an end point.
The number of the second type pointers is the same as the number of the phases of at least one phase of the three phases and can correspond to one another, each second type pointer comprises an angle difference pointer corresponding to the difference, and the angle difference pointer takes the circle center as a starting point and the voltage and current angle difference vector coordinate as an end point.
In still another exemplary embodiment of the checking method of the power protection device of the present invention, on the basis of the first, second, or third exemplary embodiment, the checking method of the power protection device may further include steps A, B, C and D as shown in fig. 3.
The step A comprises the following steps: and acquiring a first angle parameter and a second angle parameter. The first angle parameter can reflect a mutual leading or lagging relation between three phases on the system side, and the second angle parameter can reflect a mutual leading or lagging relation between three phases on the unit side (also called as a line side). The first and second angle parameters may be measured by a phase detector.
The step B comprises the following steps: and performing data conversion processing on the first angle parameter and the second angle parameter to obtain two groups of rotation vector coordinate parameters.
The step C comprises the following steps: and drawing according to the two groups of rotation vector coordinate parameters, and obtaining a system side angle graph and a unit side angle graph.
The step D comprises the following steps: and judging whether the power protection device and the unit belong to the same power supply system or not according to the system side angle graph and the unit side angle graph. The system side is a bus side connected with the unit, i.e. a side connected with a power grid.
In this embodiment, as shown in fig. 8 (a), the system-side angle graph may include a circle and a third type of pointer located within the circle, the third type of pointer being from the center of the circle and ending at the rotation vector coordinate corresponding to the system side.
As shown in fig. 8 (b), the unit-side angle graph may include a circle and a fourth type pointer located within the circle, the fourth type pointer having a center of the circle as a starting point and a rotation vector coordinate corresponding to the unit side as an ending point.
The system side angle graph and the unit side angle graph can be marked with angle scales on the circumference. Furthermore, the phase pattern can also display the size of the angle represented by the pointer.
The data conversion processing of the power data can be performed by the following formulas 7 to 10.
The formulas 7 to 10 are respectively:
x2=getProperty(_root.c0,_x)+Math.cos((90-d2)*Math.PI/180)*(getProperty(_root.c0,_width)-△t)/2，
y2=getProperty(_root.c0,_y)-Math.sin((90-d2)*Math.PI/180)*(getProperty(_root.c0,_width)-△t)/2，
x3=getProperty(_root.c0,_x)+Math.cos((90-d3)*Math.PI/180)*(getProperty(_root.c0,_width)-△t)/2，
y3=getProperty(_root.c0,_y)-Math.sin((90-d3)*Math.PI/180)*(getProperty(_root.c0,_width)-△t)/2，
wherein x is2、y2Respectively the abscissa and ordinate, x, of the coordinate of the rotation vector after the transformation of the first angle parameter3、y3Respectively the abscissa and ordinate of the rotation vector coordinate after the second angle parameter is converted, d1Is a first angle parameter, d2As the second angle parameter, the other parameters have the same meanings as in the above formula 1.
In the above four exemplary embodiments of the present invention, after the data is collected, normalization processing may be further performed through a NUMBER function to normalize the data to a digital type. Further, whether the normalized data meets the limitation requirement or not can be judged through an if function, and the data conversion processing is carried out under the condition that the normalized data meets the limitation requirement. Furthermore, the change condition of the acquired data can be monitored in real time through a frame frequency trigger function, and the steps of processing, drawing and checking are repeatedly carried out under the condition that the data are changed.
In the above four exemplary embodiments of the present invention, getProperty () is used to obtain the specified property of the object inside the parentheses, getProperty () is a function that is common in the art, and the meaning of the function represented and the meaning of the identifier (root, width, etc.) inside the parentheses are clear to those skilled in the art. Mat.cos () and mat.sin () are trigonometric functions used to get objects in parentheses and are also common functions in the art.
The invention also provides a checking system of the power protection device.
In an exemplary embodiment of the present invention, as shown in fig. 4, the checking system of the power protection device may include: the system comprises a data acquisition module, a processing module, a drawing module and a display module which are connected in sequence.
The data acquisition module can acquire the electric power data of the electric power protection device. The power protection devices may include primary and/or backup protection devices, such as devices for generator differential protection, generator backup protection, primary differential protection, primary backup protection, primary non-charge protection, bus charging protection, line light differential protection, line backup protection, line distance protection, and the like. The power data may include A, B and the voltage phase angle and current phase angle of at least one of the C three phases, such as the phase angle in voltage 99.10 10 and current 2.54 42 displayed in polar coordinates on the power protection device, and so on.
As shown in fig. 5, the processing module includes at least one of a first processing unit and a second processing unit; the dashed and solid lines in fig. 5 indicate alternatives, e.g. the processing module may comprise only the first processing unit. The first processing unit can perform data conversion processing on the voltage phase angle and the current phase angle of at least one of the three phases to obtain a voltage rotation vector coordinate and a current rotation vector coordinate of at least one of the three phases; further, the first processing unit is also capable of finding a difference between the voltage phase angle and the current phase angle. The second processing unit can obtain a difference value between the voltage phase angle and the current phase angle, and then data conversion processing is carried out on the difference value to obtain a voltage-current angle difference value vector coordinate of at least one phase in the three phases.
The drawing module can draw according to the coordinates obtained by the processing module and obtain a phase graph.
The display module can display the phase graph.
In this embodiment, the processing module can perform coordinate processing on the power data by using the above formula, and obtain a rotation vector coordinate parameter. For example, the first processing unit can perform data conversion processing using expressions 1 to 4, and the second processing unit can perform data conversion processing using expressions 5 to 6.
In this embodiment, before performing the data conversion processing on the power data, the processing module may further perform normalization processing on the power data. For example, the processing module can perform normalization processing through a NUMBER function, and normalize the input power data into a digital type, that is, convert the input power data into numerical data suitable for the processing module to recognize processing, so as to perform formula processing (i.e., formula 1 and formula 2 processing).
In this embodiment, the processing module may further determine whether the power data meets a limitation requirement, for example, the angle needs to be within 360 ℃, and perform subsequent processing when the power data meets the limitation requirement.
In this embodiment, the phase pattern includes: for example, in the case that the processing module only includes the first processing unit, the phase pattern in the checking method of the power protection device may be the first phase pattern; in case the processing module comprises only a second processing unit, the phase pattern may be the second phase pattern described above; in case the processing module comprises only a third processing unit, the phase pattern may be the third phase pattern as described above.
Further, the display module may display the voltage indicator and the current indicator in different colors.
Further, the display module can display the angle value in a text form. Still further, the display module can also display the angle difference in a text form.
Furthermore, the quadrant corresponding conditions can be displayed simultaneously through characters. The condition of sending out the idle work can be displayed by characters.
In this embodiment, the data acquisition module is further capable of acquiring a first angle parameter and a second angle parameter. Wherein the first angle parameter is a parameter which can reflect A, B and the mutual leading or lagging relation between the three phases C on the system side. The second angle parameter is a parameter on the unit side capable of reflecting the mutual advance or lag relationship between A, B and the C three phases.
The processing module further comprises a third processing unit, and the third processing unit can respectively perform data conversion processing on the first angle parameter and the second angle parameter and obtain two sets of rotation vector coordinate parameters. The third processing unit can process the first angle parameter and the second angle parameter by using the above formulas 7 to 10.
The drawing module can also respectively draw the two groups of rotation vector coordinate parameters to obtain a system side angle graph and a unit side angle graph. The system side angle pattern and the unit side angle pattern may be respectively the same as the system side angle pattern and the unit side angle pattern in the above-described electric power protection device checking method.
The display module can also simultaneously display the system side angle graph and the unit side angle graph.
In summary, the advantages of the verification system and method of the power protection device of the present invention may include:
(1) the problem that relay protection phase display is not visual enough in an electric power production field can be solved, and related personnel are assisted to analyze protection faults so as to quickly lock fault points;
(2) the method can assist the overhaul or related users to clearly know the real-time condition of the data of the current protection record, avoid unnecessary mental labor and improve the efficiency in the aspects of equipment debugging, fault treatment and the like.
Although the present invention has been described above by reference to the accompanying drawings and exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes can be made to the exemplary embodiments of the present invention without departing from the spirit and scope defined by the claims.
Claims (9)
1. A method for verifying a power protection device, the method comprising the steps of:
collecting power data of a power protection device, wherein the power data comprises a voltage phase angle and a current phase angle of at least one of three phases;
respectively carrying out data conversion processing on the power data by adopting a formula 1, a formula 2, a formula 3 and a formula 4 to obtain a voltage rotating vector coordinate and a current rotating vector coordinate of at least one phase in the three phases;
drawing according to the voltage rotation vector coordinates and the current rotation vector coordinates to obtain a first phase graph;
checking the phase relation of the voltage and the current by using the first phase diagram;
wherein, formula 1 is:
xu＝getProperty(_root.c0,_x)+Math.cos((90-du)*Math.PI/180)*(getProperty(_root.c0,_width)-△t)/2，
wherein x isuIs the abscissa of the voltage rotation vector coordinate, c0 is the center of the circle, duThe method comprises the steps of calculating a voltage phase angle, wherein delta t is a correction coefficient, getProperty (root.c0, x) is an abscissa of a circle center on an acquired interface, getProperty (root.c0, width) is the diameter of the acquired circle, Math.PI/180 is used for converting an angle and a radian, and Math.cos () is used for calculating a cosine value of an object in a bracket;
the formula 2 is:
yu＝getProperty(_root.c0,_y)-Math.sin((90-du)*Math.PI/180)*(getProperty(_root.c0,_width)-△t)/2，
wherein, yuThe method comprises the steps that a voltage rotation vector coordinate is used as a vertical coordinate, getProperty (root.c0, _ y) is used as a vertical coordinate for obtaining a circle center on an interface, and Math.sin () is used for calculating a sine value of an object in a bracket;
formula 3 is:
xi＝getProperty(_root.c0,_x)+Math.cos((90-di)*Math.PI/180)*(getProperty(_root.c0,_width)-△t)/2，
wherein x isiAs abscissa of the vector coordinate of the rotation of the current, diIs the current phase angle;
formula 4 is:
yi＝getProperty(_root.c0,_y)-Math.sin((90-di)*Math.PI/180)*(getProperty(_root.c0,_width)-△t)/2，
wherein, yiIs the ordinate of the current rotation vector coordinate.
2. The method of checking a power protection device according to claim 1, wherein the first phase pattern includes: a circular, rectangular coordinate system and sets of pointers of a first type, wherein,
the circle is divided into four parts by the rectangular coordinate system, and the circle center is superposed with the origin of the rectangular coordinate system;
the number of the first type pointers is the same as the number of the phases of at least one phase of the three phases, and the first type pointers can correspond to one another, each group of the first type pointers comprises a voltage pointer corresponding to the voltage phase angle and a current pointer corresponding to the current phase angle, the voltage pointer takes the circle center as a starting point and takes the voltage rotation vector coordinate as an end point, and the current pointer takes the circle center as a starting point and takes the current rotation vector coordinate as an end point.
3. A method for verifying a power protection device, the method comprising the steps of:
collecting power data of a power protection device, wherein the power data comprises a voltage phase angle and a current phase angle of at least one of three phases;
respectively carrying out data conversion processing on the power data by adopting a formula 1, a formula 2, a formula 3 and a formula 4 to obtain a voltage rotating vector coordinate and a current rotating vector coordinate of at least one phase in the three phases; obtaining the difference value of the voltage phase angle and the current phase angle, and respectively carrying out data conversion processing on the difference value by adopting a formula 5 and a formula 6 to obtain the vector coordinate of the voltage current angle difference value of at least one phase in the three phases;
drawing according to the voltage rotation vector coordinate, the current rotation vector coordinate and the voltage and current angle difference value vector coordinate to obtain a third phase figure;
checking the phase relation of the voltage and the current and the power transmission condition by using the third phase diagram;
wherein, formula 1 is:
xu＝getProperty(_root.c0,_x)+Math.cos((90-du)*Math.PI/180)*(getProperty(_root.c0,_width)-△t)/2，
wherein x isuIs the abscissa of the voltage rotation vector coordinate, c0 is the center of the circle, duThe method comprises the steps of calculating a voltage phase angle, wherein delta t is a correction coefficient, getProperty (root.c0, x) is an abscissa of a circle center on an acquired interface, getProperty (root.c0, width) is the diameter of the acquired circle, Math.PI/180 is used for converting an angle and a radian, and Math.cos () is used for calculating a cosine value of an object in a bracket;
the formula 2 is:
yu＝getProperty(_root.c0,_y)-Math.sin((90-du)*Math.PI/180)*(getProperty(_root.c0,_width)-△t)/2，
wherein, yuThe method comprises the steps that a voltage rotation vector coordinate is used as a vertical coordinate, getProperty (root.c0, _ y) is used as a vertical coordinate for obtaining a circle center on an interface, and Math.sin () is used for calculating a sine value of an object in a bracket;
formula 3 is:
xi＝getProperty(_root.c0,_x)+Math.cos((90-di)*Math.PI/180)*(getProperty(_root.c0,_width)-△t)/2，
wherein x isiAs abscissa of the vector coordinate of the rotation of the current, diIs the current phase angle;
formula 4 is:
yi＝getProperty(_root.c0,_y)-Math.sin((90-di)*Math.PI/180)*(getProperty(_ro
ot.c0,_width)-△t)/2，
wherein, yiThe ordinate is the ordinate of the current rotation vector coordinate;
formula 5 is:
x1＝getProperty(_root.c0,_x)+Math.cos((90-d1)*Math.PI/180)*(getProperty(_r
oot.c0,_width)-△t)/2，
wherein x is1As abscissa of the vector coordinate of the angle difference of the voltage and current, d1Is the difference between the voltage phase angle and the current phase angle;
formula 6 is:
y1＝getProperty(_root.c0,_y)-Math.sin((90-d1)*Math.PI/180)*(getProperty(_r
oot.c0,_width)-△t)/2，
wherein, y1Is the ordinate of the vector coordinate of the voltage and current angle difference value.
4. The method for checking a power protection device according to claim 1 or 3, wherein the method further comprises the steps of: acquiring a first angle parameter capable of reflecting the mutual leading or lagging relation between three phases at the system side; acquiring a second angle parameter capable of reflecting the mutual leading or lagging relation between three phases on the unit side;
performing data conversion processing on the first angle parameter and the second angle parameter to obtain two groups of rotation vector coordinate parameters;
drawing according to the two groups of rotation vector coordinate parameters, and obtaining a system side angle graph and a unit side angle graph;
and judging whether the system and the unit belong to the same power supply or not according to the system side angle graph and the unit side angle graph.
5. The checking system of the power protection device is characterized by comprising a data acquisition module, a processing module, a drawing module and a display module, wherein,
the data acquisition module can acquire power data of the power protection device, wherein the power data comprises a voltage phase angle and a current phase angle of at least one of the three phases;
the processing module comprises at least one of a first processing unit and a second processing unit, wherein the first processing unit can perform data conversion processing on the voltage phase angle and the current phase angle and obtain a voltage rotation vector coordinate and a current rotation vector coordinate of at least one phase of the three phases; the second processing unit can calculate the difference value of the voltage phase angle and the current phase angle, then data conversion processing is carried out on the difference value, and the vector coordinate of the voltage current angle difference value of at least one phase in the three phases is obtained;
the drawing module can draw according to the coordinates obtained by the processing module and obtain a phase graph;
the display module can display the phase graph;
the first processing unit can perform data conversion processing on the voltage phase angle and the current phase angle by adopting an equation 1, an equation 2, an equation 3 and an equation 4;
wherein, formula 1 is:
xu＝getProperty(_root.c0,_x)+Math.cos((90-du)*Math.PI/180)*(getProperty(_root.c0,_width)-△t)/2，
wherein x isuIs the abscissa of the voltage rotation vector coordinate, c0 is the center of the circle, duThe method comprises the steps of calculating a voltage phase angle, wherein delta t is a correction coefficient, getProperty (root.c0, x) is an abscissa of a circle center on an acquired interface, getProperty (root.c0, width) is the diameter of the acquired circle, Math.PI/180 is used for converting an angle and a radian, and Math.cos () is used for calculating a cosine value of an object in a bracket;
the formula 2 is:
yu＝getProperty(_root.c0,_y)-Math.sin((90-du)*Math.PI/180)*(getProperty(_root.c0,_width)-△t)/2，
wherein, yuThe method comprises the steps that a voltage rotation vector coordinate is used as a vertical coordinate, getProperty (root.c0, _ y) is used as a vertical coordinate for obtaining a circle center on an interface, and Math.sin () is used for calculating a sine value of an object in a bracket;
formula 3 is:
xi＝getProperty(_root.c0,_x)+Math.cos((90-di)*Math.PI/180)*(getProperty(_root.c0,_width)-△t)/2，
wherein x isiAs abscissa of the vector coordinate of the rotation of the current, diIs the current phase angle;
formula 4 is:
yi＝getProperty(_root.c0,_y)-Math.sin((90-di)*Math.PI/180)*(getProperty(_root.c0,_width)-△t)/2，
wherein, yiIs the ordinate of the current rotation vector coordinate.
6. The verification system for a power protection device according to claim 5, wherein the first processing unit is further capable of performing normalization processing on the voltage phase angle and current phase angle data before performing the data conversion processing.
7. The verification system for a power protection device according to claim 5, wherein the phase pattern comprises a circle, a rectangular coordinate system, and a plurality of sets of pointers of the first type and/or a plurality of pointers of the second type located within the circle, the circle being divided into four parts by the rectangular coordinate system, the four parts corresponding to four quadrants, the center of the circle coinciding with the origin of the rectangular coordinate system, wherein,
the number of groups of the first-class pointers is the same as the number of phases of at least one phase in the three phases and can correspond to each other one by one, each group of the first-class pointers comprises a voltage pointer corresponding to the voltage phase angle and a current pointer corresponding to the current phase angle, the voltage pointer takes the circle center as a starting point and takes the voltage rotation vector coordinate as an end point, and the current pointer takes the circle center as a starting point and takes the current rotation vector coordinate as an end point;
the number of the second type pointers is the same as the number of the phases of at least one phase of the three phases and can correspond to one another, each second type pointer comprises an angle difference pointer corresponding to the difference, and the angle difference pointer takes the circle center as a starting point and the voltage and current angle difference vector coordinate as an end point.
8. The power protection device checking system according to claim 7, wherein in a case where the voltage pointer and the current pointer coincide, the drawing module is capable of extending a length of the shielded pointer, and the display module is capable of displaying the extension process in real time.
9. The power protection device verification system of claim 5, wherein the data collection module is further capable of collecting: the system comprises a reaction system side three-phase system, a reaction unit side three-phase system and a reaction unit side three-phase system, wherein the reaction system side three-phase system comprises a first angle parameter and a second angle parameter, the first angle parameter is in a mutual leading or lagging relationship, and the second angle parameter is in a mutual leading or lagging relationship;
the processing module further comprises a third processing unit, and the third processing unit can respectively perform data conversion processing on the first angle parameter and the second angle parameter to obtain two groups of rotation vector coordinate parameters;
the drawing module can also draw according to the two groups of rotation vector coordinate parameters and obtain a system side angle graph and a unit side angle graph;
the display module can also simultaneously display the system side angle graph and the unit side angle graph.
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