CN113533896A - Device and method for evaluating transformer substation signal transmission system - Google Patents
Device and method for evaluating transformer substation signal transmission system Download PDFInfo
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- CN113533896A CN113533896A CN202111077648.5A CN202111077648A CN113533896A CN 113533896 A CN113533896 A CN 113533896A CN 202111077648 A CN202111077648 A CN 202111077648A CN 113533896 A CN113533896 A CN 113533896A
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- G—PHYSICS
- 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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/15—Correlation function computation including computation of convolution operations
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- G—PHYSICS
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- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C25/00—Arrangements for preventing or correcting errors; Monitoring arrangements
Abstract
The invention discloses a device and a method for evaluating a signal transmission system of a transformer substation, comprising a signal measurement unit before power transformation; a power transformation equipment frequency modulation unit; a post-power-transformation signal measuring unit; the data processing system receives data of the signal measuring unit before power transformation, the frequency modulation unit of the power transformation equipment and the signal measuring unit after power transformation, creates a first functional relation among a plurality of target objects before power transformation equipment transformation and a second functional relation among a plurality of target objects after power transformation equipment transformation, analyzes a transformation coefficient between the first functional relation and the second functional relation to determine the working stability of the power transformation equipment before and after power transformation, and determines the transmission stability of the signal integration transmission unit according to the received data time difference between the signal measuring unit before power transformation and the signal measuring unit after power transformation; the method identifies the instability of data before the substation is accessed, and improves the accuracy of automatic physical examination of the substation.
Description
Technical Field
The invention relates to the technical field of transformer substations, in particular to a device and a method for evaluating a transformer substation signal transmission system.
Background
The transformer substation is a place for converting voltage and current, receiving electric energy and distributing electric energy in an electric power system, and the transformer substation in a power plant is a boosting transformer substation and is used for boosting the electric energy generated by a generator and then feeding the electric energy into a high-voltage power grid.
The electric equipment in the transformer substation is divided into primary equipment and secondary equipment, the primary equipment refers to equipment for directly producing, conveying, distributing and using electric energy and mainly comprises a transformer, a high-voltage circuit breaker, a disconnecting switch, a bus, a lightning arrester, a capacitor, a reactor and the like, the secondary equipment in the transformer substation refers to equipment for measuring, monitoring, controlling and protecting the operation working conditions of the primary equipment and a system, and the secondary equipment mainly comprises a relay protection device, an automatic device, a measurement and control device, a metering device, an automatic system and direct current equipment for providing power for the secondary equipment.
The data monitored by the secondary equipment of the transformer substation are processed, so that the automatic unmanned inspection work of the transformer substation can be realized, and the existing transformer substation signal transmission system evaluation system has the following defects:
the stability of the substation accessed to the power grid after being boosted can only be evaluated, the operation quality of the substation is evaluated according to the stability after being boosted, and the unstable data condition before being accessed to the substation cannot be identified, so that the problem of low accuracy of the operation quality of the substation is evaluated.
Disclosure of Invention
The invention aims to provide a device and a method for evaluating a substation signal transmission system, which aim to solve the technical problem that the operation quality precision of an evaluation substation is low due to the fact that the unstable data before the access of the substation cannot be identified in the prior art.
In order to solve the technical problems, the invention specifically provides the following technical scheme:
an apparatus for evaluating a substation signal transmission system, comprising:
a pre-transformation signal measuring unit for measuring a plurality of target objects before transformation by the transformation equipment;
the power transformation equipment frequency modulation unit is used for regulating and controlling the transformation grade of the power transformation equipment;
the post-power transformation signal measuring unit is used for measuring a plurality of target objects transformed by the power transformation equipment;
the signal integration transmission unit is used for transmitting the data of the signal measurement unit before power transformation, the frequency modulation unit of the power transformation equipment and the signal measurement unit after power transformation to a data processing system through different channels;
the data processing system is used for receiving and processing data of the signal measuring unit before power transformation, the frequency modulation unit of the power transformation equipment and the signal measuring unit after power transformation;
the data processing system receives data of the signal measuring unit before power transformation, the frequency modulation unit of the power transformation equipment and the signal measuring unit after power transformation, a first functional relation between a plurality of target objects before the power transformation equipment is transformed and a second functional relation between a plurality of target objects after the power transformation equipment is transformed are created through a parameter correlation module, a transformation coefficient between the first functional relation and the second functional relation is analyzed through an evaluation module to determine the working stability of the power transformation equipment before and after power transformation, and the evaluation module determines the transmission stability of the signal integrated transmission unit according to the received data time difference between the signal measuring unit before power transformation and the signal measuring unit after power transformation.
As a preferred embodiment of the present invention, the signal measurement unit before power transformation selects and monitors the target object based on the power transformation property of the power transformation device, and the signal measurement unit after power transformation selects and monitors the target object which is the same as the signal measurement unit before power transformation;
the target object is positively correlated with the regulation of the power transformation properties of the power transformation apparatus, including a voltage step-up operation and a voltage step-down operation.
As a preferred aspect of the present invention, a mathematical relation library is further provided in the data processing system, a functional relation for reflecting the target object in the power system is stored in the mathematical relation library, and the functional relation is used for calculating the working stability of the power transformation equipment;
the parameter association module selects a first functional relation and a second functional relation representing the association relation of the target object from a mathematical relation base.
As a preferred scheme of the present invention, the data processing system includes a storage module, where the storage module is configured to store received data of the pre-power-transformation signal measurement unit, the frequency modulation unit of the power transformation device, and the post-power-transformation signal measurement unit;
the frequency recording module is used for automatically updating the times of the storage module for storing the output data of the signal measuring unit before power transformation and the times of the storage module for storing the output data of the signal measuring unit after power transformation;
and the time recording module is used for automatically generating a first time point at which the storage module stores the output data of the signal measuring unit before power transformation at the same frequency and a second time point at which the output data of the signal measuring unit before power transformation at the same frequency are stored.
As a preferred embodiment of the present invention, the implementation process of analyzing the working stability of the signal integration transmission unit by the evaluation module is as follows:
the evaluation module extracts a first time point of the signal measurement unit before power transformation and a second time point of the signal measurement unit after power transformation, which are recorded by the storage module at the same frequency, and calculates a time difference between the first time point and the second time point;
and determining the working stability of the signal integration transmission unit according to the time difference of the data updated by the storage module at each frequency.
As a preferred aspect of the present invention, an implementation process of analyzing, by the evaluation module, the working stability of the power transformation device before power transformation is as follows:
distinguishing a target object directly regulated and controlled by the power transformation equipment and a target object indirectly regulated and controlled by the power transformation equipment based on the power transformation properties of the power transformation equipment, and determining the first functional relational expression and the second functional relational expression by taking the target object indirectly regulated and controlled as an independent variable and the target object directly regulated and controlled as a dependent variable;
determining an active range of a proportionality coefficient between the independent variable and the dependent variable;
calculating an actual proportionality coefficient between an independent variable and a dependent variable of the first function relational expression based on directly regulated and controlled target object data and indirectly regulated and controlled target object data which are monitored by the signal measurement unit before power transformation in real time;
and comparing the actual proportionality coefficient with the movable range of the proportionality coefficient to determine the working stability of the power transformation equipment before power transformation.
As a preferred scheme of the present invention, a two-dimensional coordinate system is created, and a time point at which a directly controlled target object in the pre-power transformation signal measurement unit and the post-power transformation signal measurement unit is obtained is taken as an abscissa, and the obtained directly controlled target object data is taken as an abscissa;
the evaluation module determines directly regulated and controlled target object data of the signal measurement unit before power transformation exceeding a set threshold value in the two-dimensional coordinate system and directly regulated and controlled target object data of the signal measurement unit after power transformation exceeding the set threshold value in the two-dimensional coordinate system so as to determine a change time point of working stability of the power transformation equipment before and after power transformation.
As a preferred aspect of the present invention, an implementation process of analyzing the working stability of the power transformation device by the evaluation module includes:
selecting the data of the directly regulated and controlled target object output by the signal measuring unit before power transformation from the storage module, and selecting the data of the directly regulated and controlled target object output by the signal measuring unit after power transformation at the same frequency;
calculating a ratio between data of the directly regulated target objects at the same frequency;
and comparing the ratio with the transformation grade output by the frequency modulation unit of the transformation equipment, and determining the working stability of the transformation equipment after transformation.
In order to solve the above technical problems, the present invention further provides the following technical solutions: an evaluation method for evaluating a device of a substation signal transmission system, comprising the steps of:
step 100, selecting a target object before measurement access to the power transformation of the power transformation equipment and a target object after the power transformation of the power transformation equipment based on the power transformation properties of the power transformation equipment;
200, sending the data of the target object to a data processing system through a signal transmission system, wherein the data processing system receives the data of the target object and stores the data in a storage module to form a database, and counting the time points of storing the data of the target object in the database each time;
step 300, creating a functional relation of the target objects, and judging the stability of the power transformation equipment before power transformation based on the proportionality coefficients of the target objects in the functional relation;
step 400, determining the stability of the power transformation equipment after power transformation according to the ratio of the target object before the power transformation of the power transformation equipment to the target object after the power transformation of the power transformation equipment.
Compared with the prior art, the invention has the following beneficial effects:
according to the method, the stability of the data before the transformer substation is connected to a power grid for power transformation is determined, and then the stability of the transformer equipment of the transformer substation is evaluated, so that the accuracy of automatic physical examination of the transformer equipment of the transformer substation is improved, the working stability of the transformer equipment of the transformer substation is judged from multiple angles, and in addition, the working stability of a signal transmission system is determined by extracting the transmission time before and after the transformer equipment with the same group of frequency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
Fig. 1 is a block diagram of an evaluation apparatus according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of an evaluation method according to an embodiment of the present invention.
The reference numerals in the drawings denote the following, respectively:
1-a pre-transformation signal measuring unit; 2-a frequency modulation unit of the power transformation equipment; 3-a post-power-transformation signal measuring unit; 4-a signal integration transmission unit; 5-a data processing system;
51-parameter association module; 52-an evaluation module; 53-a mathematical relationship library; 54-a storage module; 55-frequency recording module; 56-time recording module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention provides an apparatus and a method for evaluating a signal transmission system of a substation, where the evaluation system of the present embodiment first determines the stability of data before the substation is connected to a power grid for power transformation, and then evaluates the stability of a substation device of the substation, so as to improve the accuracy of automated physical examination of the substation device of the substation, and in addition, determines the working stability of the signal transmission system by extracting the transmission time before and after the substation device of the same group of frequencies.
The device for evaluating the substation signal transmission system specifically comprises: the system comprises a signal measuring unit 1 before power transformation, a frequency modulation unit 2 of power transformation equipment, a signal measuring unit 3 after power transformation, a signal integrated transmission unit 4 and a data processing system 5.
The pre-transformation signal measuring unit 1 is used for measuring a plurality of target objects before transformation by the transformation equipment, and the transformation equipment frequency modulation unit 2 is used for regulating and controlling the transformation grade of the transformation equipment; the post-power transformation signal measurement unit 3 is used to measure a plurality of target objects transformed by the power transformation equipment.
The signal measurement unit 1 before power transformation selects a monitoring target object based on the power transformation properties of the power transformation equipment, the signal measurement unit 3 after power transformation selects a target object which is the same as the target object before power transformation 1, the target object is positively correlated with the power transformation property regulation and control of the power transformation equipment, and the power transformation properties of the power transformation equipment comprise voltage boosting operation and voltage reducing operation.
The signal integration transmission unit 4 is used for transmitting data of the signal measurement unit 1 before power transformation, the frequency modulation unit 2 of the power transformation equipment and the signal measurement unit 3 after power transformation to the data processing system 5 through different channels;
and the data processing system 5 is used for receiving and processing data of the signal measuring unit 1 before power transformation, the frequency modulation unit 2 of the power transformation equipment and the signal measuring unit 3 after power transformation.
The data processing system 5 receives data of the signal measuring unit 1 before power transformation, the frequency modulation unit 2 of the power transformation equipment and the signal measuring unit 3 after power transformation, creates a first functional relation among a plurality of target objects before power transformation equipment transformation and a second functional relation among a plurality of target objects after power transformation equipment transformation through the parameter correlation module 51, analyzes a transformation coefficient between the first functional relation and the second functional relation through the evaluation module 52 to determine the working stability of the power transformation equipment before and after power transformation, and the evaluation module 52 determines the transmission stability of the signal integration transmission unit 4 according to the received data time difference of the signal measuring unit 1 before power transformation and the signal measuring unit 3 after power transformation.
The data processing system 5 includes a memory module 54, a frequency recording module 55 and a time recording module 56.
The storage module 54 is configured to store received data of the pre-transformation signal measurement unit 1, the transformation equipment frequency modulation unit 2, and the post-transformation signal measurement unit 3; the frequency recording module 55 is used for automatically updating the times of the storage module 54 for storing the output data of the signal measuring unit 1 before power transformation and the times of the storage module 54 for storing the output data of the signal measuring unit 3 after power transformation; the time recording module 56 is configured to automatically generate a first time point at which the storage module 54 stores the output data of the pre-transformation signal measuring unit 1 and a second time point at which the output data of the pre-transformation signal measuring unit 1 at the same frequency are stored.
The evaluation module 52 analyzes the operation stability of the signal integration transmission unit 4 by:
the evaluation module 52 extracts a first time point of the signal measurement unit 1 before power transformation and a second time point of the signal measurement unit 3 after power transformation, which are recorded by the storage module 54 at the same frequency, calculates a time difference between the first time point and the second time point, and determines the working stability of the signal integration transmission unit 4 according to the time difference of the data of each frequency updated by the storage module 54.
The data processing system 5 is further provided with a mathematical relation library 53, wherein a functional relation for reflecting the target object in the power system is stored in the mathematical relation library 53, and the functional relation is used for calculating the working stability of the power transformation equipment.
The parameter correlation module 51 selects a first functional relation and a second functional relation representing the correlation of the target object from the mathematical relation library 53.
The implementation process of analyzing the working stability of the power transformation equipment by the evaluation module 52 is as follows:
distinguishing a target object directly regulated and controlled by the power transformation equipment and a target object indirectly regulated and controlled by the power transformation equipment based on the power transformation properties of the power transformation equipment, and determining a first function relational expression and a second function relational expression by taking the target object indirectly regulated and controlled as an independent variable and the target object directly regulated and controlled as a dependent variable;
determining the activity range of a proportionality coefficient between an independent variable and a dependent variable;
calculating an actual proportionality coefficient between an independent variable and a dependent variable of a first function relation based on directly regulated and controlled target object data and indirectly regulated and controlled target object data which are monitored in real time by a signal measurement unit 1 before power transformation;
and comparing the actual proportionality coefficient with the movable range of the proportionality coefficient to determine the working stability of the power transformation equipment before power transformation.
Therefore, the data instability of the target object after the power transformation of the power transformation equipment caused by the data instability of the target object before the power transformation is eliminated, and the misjudgment probability of the working stability of the power transformation equipment is reduced.
The further implementation steps of judging the stability of the target object before the substation equipment works are as follows: a two-dimensional coordinate system is created, and the time point at which the target object directly regulated and controlled in the pre-power-transformation signal measuring unit 1 and the post-power-transformation signal measuring unit 3 is acquired is taken as the abscissa, and the acquired target object data directly regulated and controlled is taken as the abscissa.
And determining the directly regulated and controlled target object data of the signal measuring unit 1 before power transformation in the two-dimensional coordinate system, which exceeds a set threshold, and the directly regulated and controlled target object data of the signal measuring unit 3 after power transformation in the two-dimensional coordinate system, which exceeds the set threshold, so as to determine the change time point of the working stability of the power transformation equipment before and after power transformation.
It should be noted that the set threshold of the pre-transformation signal measuring unit 1 and the set threshold of the post-transformation signal measuring unit 3 have the same ratio relationship with the same type of directly controlled target object data in the pre-transformation signal measuring unit 1 and the post-transformation signal measuring unit 3.
When the data of the target object directly regulated and controlled by the signal measuring unit 1 before power transformation exceeds a set threshold, the signal measuring unit 3 after power transformation can monitor that the same target object exceeds the set threshold, and determine the change time point of the working stability of the power transformation equipment before power transformation.
When the data of the target object directly regulated and controlled by the signal measuring unit 1 before power transformation exceeds a set threshold value, and the signal measuring unit 3 after power transformation monitors that the data of the same target object does not exceed the set threshold value, determining the change time point of the working stability of the power transformation equipment.
The implementation process of analyzing the working stability of the power transformation equipment by the evaluation module 52 is as follows:
selecting the data of the directly regulated target object output by the signal measuring unit 1 before power transformation from the storage module 54, and selecting the data of the directly regulated target object output by the signal measuring unit 3 after power transformation at the same frequency;
calculating the ratio of the data of the directly regulated target objects with the same frequency;
and comparing the ratio with the transformation grade output by the frequency modulation unit 2 of the power transformation equipment to determine the working stability of the power transformation equipment after power transformation.
Thus, as shown in fig. 2, the present invention also provides an evaluation method for evaluating a device of a substation signal transmission system, comprising the steps of:
step 100, selecting a target object before measurement access to the power transformation of the power transformation equipment and a target object after power transformation of the power transformation equipment based on the power transformation properties of the power transformation equipment;
200, sending the data of the target object to a data processing system through a signal transmission system, receiving the data of the target object by the data processing system, storing the data in a storage module to form a database, and counting the time point of storing the data of the target object in the database each time;
step 300, creating a functional relation of the target objects, and judging the stability of the power transformation equipment before power transformation based on the proportionality coefficients of the target objects in the functional relation;
and 400, determining the stability of the power transformation equipment after power transformation according to the ratio of the target object before the power transformation of the power transformation equipment to the target object after the power transformation of the power transformation equipment.
The evaluation system of the embodiment firstly determines the stability of data before the transformer substation is connected into a power grid for power transformation, and then evaluates the stability of the transformer equipment of the transformer substation, so that the accuracy of automatic physical examination of the transformer equipment of the transformer substation is improved, the working stability of the transformer equipment of the transformer substation is judged from multiple angles, and in addition, the working stability of the signal transmission system is determined by extracting the transmission time before and after the transformer equipment of the same group of frequency.
The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present application and such modifications and equivalents should also be considered to be within the scope of the present application.
Claims (9)
1. An apparatus for evaluating a substation signal transmission system, comprising:
a pre-transformation signal measuring unit (1) for measuring a plurality of target objects before transformation by the transformation equipment;
the power transformation equipment frequency modulation unit (2) is used for regulating and controlling the transformation grade of the power transformation equipment;
a post-power transformation signal measuring unit (3) for measuring a plurality of target objects transformed by the power transformation equipment;
the signal integration transmission unit (4) is used for transmitting the data of the signal measurement unit (1) before power transformation, the frequency modulation unit (2) of the power transformation equipment and the signal measurement unit (3) after power transformation to the data processing system (5) through different channels;
the data processing system (5) is used for receiving and processing data of the signal measuring unit (1) before power transformation, the frequency modulation unit (2) of the power transformation equipment and the signal measuring unit (3) after power transformation;
the data processing system (5) is specifically configured to: receiving data of the signal measuring unit (1) before power transformation, the frequency modulation unit (2) of the power transformation equipment and the signal measuring unit (3) after power transformation, creating a first functional relation among a plurality of target objects before the power transformation equipment is transformed and a second functional relation among a plurality of target objects after the power transformation equipment is transformed through a parameter correlation module (51), analyzing a transformation coefficient between the first functional relation and the second functional relation through an evaluation module (52) to determine the working stability of the power transformation equipment before and after power transformation, and determining the transmission stability of the signal integrated transmission unit (4) through the evaluation module (52) according to the received data time difference between the signal measuring unit (1) before power transformation and the signal measuring unit (3) after power transformation.
2. An arrangement for evaluating a substation signal transmission system according to claim 1, characterized in that: the signal measuring unit (1) before power transformation selects and monitors the target object based on the power transformation property of the power transformation equipment, and the signal measuring unit (3) after power transformation selects and monitors the target object which is the same as the signal measuring unit (1) before power transformation;
the target object is positively correlated with the regulation of the power transformation properties of the power transformation apparatus, including a voltage step-up operation and a voltage step-down operation.
3. An arrangement for evaluating a substation signal transmission system according to claim 2, characterized in that: a mathematical relation library (53) is further arranged in the data processing system (5), a functional relation for reflecting the target object in the power system is stored in the mathematical relation library (53), and the functional relation is used for calculating the working stability of the power transformation equipment;
the parameter association module (51) selects a first functional relation and a second functional relation representing the association relation of the target object from a mathematical relation library (53).
4. An arrangement for evaluating a substation signal transmission system according to claim 3, characterized in that: the data processing system (5) comprises a storage module (54), wherein the storage module (54) is used for storing received data of the signal measuring unit (1) before power transformation, the frequency modulation unit (2) of the power transformation equipment and the signal measuring unit (3) after power transformation;
the frequency recording module (55) is used for automatically updating the frequency of the storage module (54) for storing the output data of the signal measuring unit (1) before power transformation and the frequency of the storage module (54) for storing the output data of the signal measuring unit (3) after power transformation;
and the time recording module (56) is used for automatically generating a first time point at which the storage module (54) stores the output data of the signal measuring unit (1) before power transformation at the same frequency and a second time point at which the output data of the signal measuring unit (1) before power transformation at the same frequency.
5. An arrangement for evaluating a substation signal transmission system according to claim 4, characterized in that: the evaluation module (52) analyzes the working stability of the signal integration transmission unit (4) by the following implementation process:
the evaluation module (52) extracts a first time point of the signal measurement unit (1) before power transformation and a second time point of the signal measurement unit (3) after power transformation, which are recorded by the storage module (54) at the same frequency, and calculates a time difference between the first time point and the second time point;
and determining the working stability of the signal integration transmission unit (4) according to the time difference of the data updated by the storage module (54) at each frequency.
6. An arrangement for evaluating a substation signal transmission system according to claim 5, characterized in that: the implementation process of analyzing the working stability of the power transformation equipment before power transformation by the evaluation module (52) is as follows:
distinguishing a target object directly regulated and controlled by the power transformation equipment and a target object indirectly regulated and controlled by the power transformation equipment based on the power transformation properties of the power transformation equipment, and determining the first functional relational expression and the second functional relational expression by taking the target object indirectly regulated and controlled as an independent variable and the target object directly regulated and controlled as a dependent variable;
determining an active range of a proportionality coefficient between the independent variable and the dependent variable;
calculating an actual proportionality coefficient between an independent variable and a dependent variable of the first function relational expression based on directly regulated and indirectly regulated target object data monitored by the signal measurement unit (1) in real time before power transformation;
and comparing the actual proportionality coefficient with the movable range of the proportionality coefficient to determine the working stability of the power transformation equipment before power transformation.
7. An arrangement for evaluating a substation signal transmission system according to claim 5, characterized in that: creating a two-dimensional coordinate system, taking the time point for acquiring the directly regulated and controlled target object in the pre-power-transformation signal measuring unit (1) and the post-power-transformation signal measuring unit (3) as an abscissa, and taking the acquired directly regulated and controlled target object data as an abscissa;
the evaluation module (52) determines directly regulated and controlled target object data of the pre-power transformation signal measuring unit (1) exceeding a set threshold value in the two-dimensional coordinate system and directly regulated and controlled target object data of the post-power transformation signal measuring unit (3) exceeding the set threshold value in the two-dimensional coordinate system so as to determine a change time point of work stability of the power transformation equipment before and after power transformation.
8. An arrangement for evaluating a substation signal transmission system according to claim 5, characterized in that: the evaluation module (52) analyzes the working stability of the power transformation equipment after power transformation, and the implementation process comprises the following steps:
selecting the data of the directly regulated target object output by the signal measuring unit (1) before power transformation from the storage module (54), and selecting the data of the directly regulated target object output by the signal measuring unit (3) after power transformation with the same frequency;
calculating a ratio between data of the directly regulated target objects at the same frequency;
and comparing the ratio with the transformation grade output by the transformation equipment frequency modulation unit (2) to determine the working stability of the transformation equipment after transformation.
9. An evaluation method applied to the device for evaluating a substation signal transmission system according to any one of claims 1 to 8, characterized by comprising the steps of:
step 100, selecting a target object before measurement access to the power transformation of the power transformation equipment and a target object after the power transformation of the power transformation equipment based on the power transformation properties of the power transformation equipment;
200, sending the data of the target object to a data processing system through a signal transmission system, wherein the data processing system receives the data of the target object and stores the data in a storage module to form a database, and counting the time points of storing the data of the target object in the database each time;
step 300, creating a functional relation of the target objects, and judging the stability of the power transformation equipment before power transformation based on the proportionality coefficients of the target objects in the functional relation;
step 400, determining the stability of the power transformation equipment after power transformation according to the ratio of the target object before the power transformation of the power transformation equipment to the target object after the power transformation of the power transformation equipment.
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