CN114371429A - Method and device for detecting deformation of transformer winding on line - Google Patents
Method and device for detecting deformation of transformer winding on line Download PDFInfo
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Abstract
The embodiment of the application provides a method and a device for detecting the deformation of a transformer winding on line, wherein the method for detecting the deformation of the transformer winding on line comprises the steps of obtaining a short-circuit impedance value and an impedance angle of a power transformer in an initial state, and rated current of the load side of the power transformer, determining the resistance component and reactance component of the short-circuit impedance, establishing the corresponding relation between the standard load power factor, the standard running current value and the standard voltage regulation rate, when the power transformer has short-circuit fault, measuring the real-time load power factor and real-time running current value of the power transformer, further determining the real-time voltage regulation rate, obtaining the reference standard voltage regulation rate corresponding to the real-time load power factor and the real-time running current value, and if the value of the real-time voltage regulation rate is not equal to the value of the reference standard voltage regulation rate, judging that the power transformer winding is deformed after the power transformer has a short-circuit fault. Therefore, whether the transformer winding is deformed or not can be monitored in real time when the power grid supplies power, and the reliability of power grid power supply is ensured.
Description
Technical Field
The embodiment of the application relates to the technical field of operation and maintenance of power transformation equipment, in particular to a method and a device for detecting deformation of a transformer winding on line.
Background
A power transformer is a device for transforming an ac voltage (current) of a certain value into another voltage (current) of the same frequency or different values, and is one of the main devices for supplying power to a power grid. The transformer winding is formed by winding a copper wire or an aluminum wire with higher conductivity, which is coated by an insulating material, is a circuit part of the power transformer, is directly connected with a power transmission line of a power grid, and is used for inputting and outputting electric energy.
The deformation of the transformer winding refers to the axial or radial dimension change of the transformer winding under the action of external force, and is usually represented by local distortion, bulge or displacement of the transformer winding. External forces that cause deformation of the transformer windings include mechanical and electrodynamic forces, wherein the mechanical forces are generated by impacts sustained by the power transformer during transport; the electric power is generated by short-circuit fault current surge inside the power transformer when the short-circuit fault of the power transformer or the lightning overvoltage surge occurs. The deformation of the transformer winding is a great hidden trouble for the safe operation of the power transformer, and can cause the power transformer to have faults and even spontaneous combustion. Therefore, how to accurately and quickly diagnose whether the transformer winding is deformed is very important for ensuring the normal operation of the power transformer and maintaining the safety and stability of power supply of a power grid.
One important indicator for determining whether a transformer winding is deformed is the voltage regulation rate of the transformer. The voltage regulation rate is influenced by the load power factor and the running current of the power transformer, and when the power transformer has a short-circuit fault, if the load power factor and the running current are abnormal, the voltage regulation rate is influenced to generate an abnormality, which indicates that a transformer winding is deformed during the short-circuit fault.
At present, the detection of the deformation of the transformer winding is completed through a transformer winding deformation test, and a frequency response method is generally adopted for detection, wherein firstly, each winding of the power transformer is grounded and fully discharged, all external connecting wires of the power transformer are removed or disconnected, then the power transformer is connected into a frequency response tester according to requirements, the frequency response of each phase of the power transformer is tested through the frequency response tester, and finally, test data obtained by the frequency response tester is processed, so that whether the transformer winding is deformed or not is judged. The method can not detect whether the transformer winding is deformed or not in real time when the power is supplied to the power grid, and if the transformer winding is not deformed, invalid power failure can be caused, so that the reliability of power supply of the power grid is influenced.
Disclosure of Invention
The application provides a method and a device for detecting transformer winding deformation on line, which can be used for solving the problem that the existing transformer winding deformation detection method cannot detect whether a transformer winding deforms or not in real time when a power grid supplies power, and the reliability of power grid power supply is influenced.
In a first aspect, an embodiment of the present application provides a method for online detecting deformation of a transformer winding, including:
acquiring a short circuit impedance value and an impedance angle of a power transformer in an initial state and rated current of a load side of the power transformer;
determining a resistance component and a reactance component of the short-circuit impedance according to the short-circuit impedance value and the impedance angle;
establishing a corresponding relation between the standard load power factor, the standard operation current value and the standard voltage regulation rate according to the rated current, the resistance component, the reactance component, a plurality of preset standard load power factors and a plurality of preset standard operation current values;
measuring a real-time load power factor and a real-time running current value of the power transformer when the power transformer has a short-circuit fault;
determining a real-time voltage regulation rate according to the rated current, the resistance component, the reactance component, the real-time load power factor and the real-time running current value;
acquiring a reference standard voltage regulation rate corresponding to the real-time load power factor and the real-time running current value from a corresponding relation among a standard load power factor, a standard running current value and a standard voltage regulation rate;
and if the value of the real-time voltage regulation rate is not equal to the value of the reference standard voltage regulation rate, judging that the power transformer winding deforms after the power transformer has a short-circuit fault.
In an implementation manner of the first aspect, the determining a resistive component and a reactive component of a short-circuit impedance according to the short-circuit impedance value and the impedance angle includes:
the resistive component is determined according to the following equation:
wherein Z isKFor the value of the short-circuit resistance,
ukr is the resistance component for the impedance angle;
the reactive component is determined according to the following equation:
wherein Z isKFor the value of the short-circuit resistance,
for the impedance angle, Ukx is the reactance component.
In an implementation form of the first aspect, the plurality of standard load power factors are set by:
determining a minimum load power factor, a load power factor value interval and a maximum load power factor of the power transformer;
and determining a plurality of standard load power factors according to the minimum load power factor, the load power factor value interval and the maximum load power factor.
In one implementable manner of the first aspect, the plurality of standard operating current values are set by:
determining a minimum operation current value, an operation current value interval and a maximum operation current value of the power transformer;
and determining a plurality of standard operating current values according to the minimum operating current value, the operating current value interval and the maximum operating current value.
In an implementation manner of the first aspect, the establishing a corresponding relationship between a standard load power factor, a standard operating current value, and a standard voltage adjustment rate according to the rated current, the resistance component, the reactance component, a plurality of preset standard load power factors, and a plurality of preset standard operating current values includes:
determining a target standard voltage regulation rate according to the rated current, the resistance component, the reactance component, the target standard load power factor and the target standard operation current value aiming at any target standard load power factor in a plurality of standard load power factors and any target standard operation current value in a plurality of standard operation current values;
and determining each standard load power factor, each standard operation current value and the corresponding standard voltage regulation rate as the corresponding relation among the standard load power factor, the standard operation current value and the standard voltage regulation rate.
In one implementation manner of the first aspect, the determining a target standard voltage adjustment rate according to the rated current, the resistance component, the reactance component, the target standard load power factor and the target standard operation current value includes:
determining a target standard voltage adjustment rate by the following formula:
wherein, INUkr is the resistive component, Ukx is the reactive component for the rated current,
is the target standard load power factor, IEyes of a userFor said target standard operating current value, Δ UEyes of a userTo the target standard voltage regulation rate, the
According to the formula
And (4) determining.
In a second aspect, an embodiment of the present application provides an apparatus for online detecting deformation of a transformer winding, where the apparatus is used to implement a method for online detecting deformation of a transformer winding in the first aspect and in various implementations, and the apparatus includes:
the short-circuit impedance value, impedance angle and rated current obtaining module is used for obtaining a short-circuit impedance value and an impedance angle of the power transformer in an initial state and rated current of a load side of the power transformer;
the resistance component and reactance component determining module is used for determining the resistance component and the reactance component of the short-circuit impedance according to the short-circuit impedance value and the impedance angle;
the corresponding relation determining module is used for establishing a corresponding relation among the standard load power factor, the standard operation current value and the standard voltage regulation rate according to the rated current, the resistance component, the reactance component, a plurality of preset standard load power factors and a plurality of preset standard operation current values;
the real-time parameter measuring module is used for measuring a real-time load power factor and a real-time running current value of the power transformer when the power transformer has a short-circuit fault;
the real-time voltage regulation rate determining module is used for determining a real-time voltage regulation rate according to the rated current, the resistance component, the reactance component, the real-time load power factor and the real-time running current value;
a reference standard voltage regulation rate obtaining module, configured to obtain a reference standard voltage regulation rate corresponding to the real-time load power factor and the real-time operating current value from a correspondence between a standard load power factor, a standard operating current value, and a standard voltage regulation rate;
and the transformer winding deformation judging module is used for judging whether the transformer winding deforms after the power transformer has the short-circuit fault, and if the value of the real-time voltage regulation rate is not equal to the value of the reference standard voltage regulation rate, judging that the transformer winding deforms after the power transformer has the short-circuit fault.
In one implementation form of the second aspect, the resistive component and reactive component determining module includes:
a resistance component determination unit for determining a resistance component according to the following formula:
wherein Z isKFor the value of the short-circuit resistance,
ukr is the resistance component for the impedance angle;
a reactance component determination unit for determining a reactance component according to the following formula:
wherein Z isKFor the value of the short-circuit resistance,
for the impedance angle, Ukx is the reactance component.
In an implementation manner of the second aspect, the correspondence determining module includes:
the standard load power factor presetting unit is used for presetting a plurality of standard load power factors;
the standard operating current value presetting unit is used for presetting a plurality of standard operating current values;
a target standard voltage adjustment rate obtaining unit, configured to determine a target standard voltage adjustment rate according to the rated current, the resistance component, the reactance component, the target standard load power factor, and a target standard operation current value, for any one of a plurality of standard load power factors and any one of a plurality of standard operation current values;
and the corresponding relation establishing unit is used for establishing the corresponding relation among the standard load power factor, the standard running current value and the standard voltage regulation rate.
In one implementation manner of the second aspect, the target standard voltage adjustment rate obtaining unit determines the target standard voltage adjustment rate by the following formula:
wherein, INUkr is the resistive component, Ukx is the reactive component for the rated current,
is the target standard load power factor, IEyes of a userFor said target standard operating current value, Δ UEyes of a userTo the target standard voltage regulation rate, the
According to the formula
And (4) determining.
The embodiment of the application provides a method and a device for detecting the deformation of a transformer winding on line, the method for detecting the deformation of the transformer winding on line comprises the steps of obtaining a short-circuit impedance value and an impedance angle of a power transformer in an initial state and a rated current of a load side of the power transformer, determining a resistance component and a reactance component of short-circuit impedance according to the short-circuit impedance value and the impedance angle, establishing a corresponding relation among a standard load power factor, a standard operating current value and a standard voltage regulation rate according to the rated current, the resistance component and the reactance component, a plurality of preset standard load power factors and a plurality of preset standard operating current values, measuring a real-time load power factor and a real-time operating current value of the power transformer when the power transformer has a short-circuit fault, and measuring the real-time load power factor and the real-time operating current value according to the rated current, the resistance component, the reactance component, the real-time load power factor and the real-time operating current value, and determining a real-time voltage adjustment rate, acquiring a reference standard voltage adjustment rate corresponding to the real-time load power factor and the real-time operation current value from the corresponding relation among the standard load power factor, the standard operation current value and the standard voltage adjustment rate, and judging that the power transformer winding deforms after the power transformer has a short-circuit fault if the value of the real-time voltage adjustment rate is not equal to the value of the reference standard voltage adjustment rate. Therefore, whether the transformer winding is deformed or not can be monitored in real time when the power grid supplies power, and the reliability of power grid power supply is ensured.
Drawings
Fig. 1 is a schematic diagram illustrating steps of a method for detecting deformation of a transformer winding on line according to a first embodiment of the present application;
fig. 2 is a schematic structural organization diagram of an apparatus for online detecting deformation of a transformer winding according to a second embodiment of the present application;
fig. 3 is a schematic structural organization diagram of a resistive component and reactive component determination module according to a second embodiment of the present application;
fig. 4 is a schematic structural organization diagram of a correspondence relation determining module according to a second embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application clearer, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The terminology used in the following examples is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of this application and the appended claims, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, such as "one or more", unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of the present application, "at least one", "one or more" means one, two or more, "a plurality" means two or more. The term "and/or" is used to describe an association relationship that associates objects, meaning that three relationships may exist; for example, a and/or B, may represent: a alone, both A and B, and B alone, where A, B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
The first embodiment of the present application discloses a method for detecting deformation of a transformer winding on line, which is specifically described below with reference to the accompanying drawings.
Fig. 1 is a schematic step diagram of a method for online detecting deformation of a transformer winding according to a first embodiment of the present disclosure, and as shown in fig. 1, the method for online detecting deformation of a transformer winding according to the first embodiment of the present disclosure includes:
Specifically, the initial state of the power transformer is a state of the power transformer when the power transformer is shipped from a factory.
And 102, determining a resistance component and a reactance component of the short-circuit impedance according to the short-circuit impedance value and the impedance angle.
Specifically, the resistance component is determined according to the following formula:
wherein Z isKFor the value of the short-circuit resistance,
ukr is the resistance component for the impedance angle;
specifically, the reactance component is determined according to the following formula:
wherein Z isKFor the value of the short-circuit resistance,
for the impedance angle, Ukx is the reactance component.
103, establishing a corresponding relation among the standard load power factor, the standard operation current value and the standard voltage regulation rate according to the rated current, the resistance component, the reactance component, a plurality of preset standard load power factors and a plurality of preset standard operation current values.
Specifically, step 103 includes:
setting a plurality of standard load power factors by:
determining a minimum load power factor, a load power factor value interval and a maximum load power factor of the power transformer;
and determining a plurality of standard load power factors according to the minimum load power factor, the load power factor value interval and the maximum load power factor.
Setting a plurality of standard operating current values by:
determining a minimum operation current value, an operation current value interval and a maximum operation current value of the power transformer;
and determining a plurality of standard operating current values according to the minimum operating current value, the operating current value interval and the maximum operating current value.
Determining a target standard voltage regulation rate according to the rated current, the resistance component, the reactance component, the target standard load power factor and the target standard operation current value aiming at any target standard load power factor in a plurality of standard load power factors and any target standard operation current value in a plurality of standard operation current values;
specifically, the target standard voltage adjustment rate is determined by the following formula:
wherein, INUkr is the resistive component, Ukx is the reactive component for the rated current,
is the target standard load power factor, IEyes of a userFor said target standard operating current value, Δ UEyes of a userTo the target standard voltage regulation rate, the
According to the formula
And (4) determining.
And determining each standard load power factor, each standard operation current value and the corresponding standard voltage regulation rate as the corresponding relation among the standard load power factor, the standard operation current value and the standard voltage regulation rate.
104, measuring a real-time load power factor and a real-time running current value of the power transformer when the power transformer has a short-circuit fault;
105, determining a real-time voltage regulation rate according to the rated current, the resistance component, the reactance component, the real-time load power factor and the real-time operation current value;
and 107, if the value of the real-time voltage regulation rate is not equal to the value of the reference standard voltage regulation rate, judging that the power transformer winding deforms after the power transformer has a short-circuit fault.
The first embodiment of the present application provides a method for detecting deformation of a transformer winding on line, which includes obtaining a short-circuit impedance value and an impedance angle of a power transformer in an initial state, and a rated current of a load side of the power transformer, determining a resistance component and a reactance component of a short-circuit impedance according to the short-circuit impedance value and the impedance angle, establishing a corresponding relationship between a standard load power factor, a standard operating current value, and a standard voltage regulation rate according to the rated current, the resistance component, the reactance component, a plurality of preset standard load power factors, and a plurality of preset standard operating current values, measuring a real-time load power factor and a real-time operating current value of the power transformer when a short-circuit fault occurs in the power transformer, determining a real-time voltage regulation rate according to the rated current, the resistance component, the reactance component, the real-time load power factor, and the real-time operating current value, and acquiring a reference standard voltage regulation rate corresponding to the real-time load power factor and the real-time operation current value from the corresponding relation among the standard load power factor, the standard operation current value and the standard voltage regulation rate, and if the value of the real-time voltage regulation rate is not equal to the value of the reference standard voltage regulation rate, judging that the power transformer winding deforms after the power transformer has a short-circuit fault. Therefore, whether the transformer winding is deformed or not can be monitored in real time when the power grid supplies power, and the reliability of power grid power supply is ensured.
The second embodiment of the present application discloses an apparatus for online detecting deformation of a transformer winding, which is used for executing the method for online detecting deformation of a transformer winding according to the first embodiment of the present application. Fig. 2 is a schematic structural diagram of an organization of an apparatus for online detecting transformer winding deformation according to a second embodiment of the present application, and referring to fig. 2, the apparatus includes:
a short-circuit impedance value, impedance angle and rated current obtaining module 10, configured to obtain a short-circuit impedance value and an impedance angle in an initial state of a power transformer, and a rated current at a load side of the power transformer;
a resistance component and reactance component determination module 20, configured to determine a resistance component and a reactance component of the short-circuit impedance according to the short-circuit impedance value and the impedance angle;
fig. 3 is a schematic structural organization diagram of a resistive component and reactive component determining module according to a second embodiment of the present application, and referring to fig. 3, the resistive component and reactive component determining module includes:
a resistance component determination unit 21 for determining a resistance component according to formula (1):
a reactance component determination unit 22 for determining a reactance component according to the formula (2):
a corresponding relation determining module 30, configured to establish a corresponding relation between the standard load power factor, the standard operating current value, and the standard voltage regulation rate according to the rated current, the resistance component, the reactance component, a plurality of preset standard load power factors, and a plurality of preset standard operating current values;
fig. 4 is a schematic structural organization diagram of a correspondence relation determining module according to a second embodiment of the present application, and referring to fig. 4, the correspondence relation determining module 30 includes:
a standard load power factor presetting unit 31 for presetting a plurality of standard load power factors;
a standard operating current value presetting unit 32 for presetting a plurality of standard operating current values;
a target standard voltage adjustment rate obtaining unit 33, configured to determine a target standard voltage adjustment rate according to the rated current, the resistance component, the reactance component, the target standard load power factor, and the target standard operation current value, for any one of a plurality of standard load power factors and any one of a plurality of standard operation current values;
specifically, the target standard voltage adjustment rate obtaining unit 33 determines the target standard voltage adjustment rate by formula (3):
and the corresponding relation establishing unit 34 is used for establishing a corresponding relation among the standard load power factor, the standard operation current value and the standard voltage regulation rate.
The real-time parameter measuring module 40 is used for measuring a real-time load power factor and a real-time running current value of the power transformer when the power transformer has a short-circuit fault;
a real-time voltage regulation rate determining module 50, configured to determine a real-time voltage regulation rate according to the rated current, the resistance component, the reactance component, the real-time load power factor, and the real-time operating current value;
a reference standard voltage adjustment rate obtaining module 60, configured to obtain a reference standard voltage adjustment rate corresponding to the real-time load power factor and the real-time operating current value from a corresponding relationship between a standard load power factor, a standard operating current value, and a standard voltage adjustment rate;
and a transformer winding deformation judging module 70, configured to judge whether the transformer winding is deformed after the power transformer has a short-circuit fault, and if the real-time voltage adjustment rate is not equal to the reference standard voltage adjustment rate, judge that the transformer winding is deformed after the power transformer has a short-circuit fault.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein.
This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains; it is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims. It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof; the scope of the invention is limited only by the appended claims.
Claims (10)
1. A method for detecting deformation of a transformer winding on line is characterized by comprising the following steps:
acquiring a short circuit impedance value and an impedance angle of a power transformer in an initial state and rated current of a load side of the power transformer;
determining a resistance component and a reactance component of the short-circuit impedance according to the short-circuit impedance value and the impedance angle;
establishing a corresponding relation between the standard load power factor, the standard operation current value and the standard voltage regulation rate according to the rated current, the resistance component, the reactance component, a plurality of preset standard load power factors and a plurality of preset standard operation current values;
measuring a real-time load power factor and a real-time running current value of the power transformer when the power transformer has a short-circuit fault;
determining a real-time voltage regulation rate according to the rated current, the resistance component, the reactance component, the real-time load power factor and the real-time running current value;
acquiring a reference standard voltage regulation rate corresponding to the real-time load power factor and the real-time running current value from a corresponding relation among a standard load power factor, a standard running current value and a standard voltage regulation rate;
and if the value of the real-time voltage regulation rate is not equal to the value of the reference standard voltage regulation rate, judging that the power transformer winding deforms after the power transformer has a short-circuit fault.
2. The method for detecting the deformation of the transformer winding on line according to claim 1, wherein the determining the resistance component and the reactance component of the short-circuit impedance according to the short-circuit impedance value and the impedance angle comprises:
the resistive component is determined according to the following equation:
wherein Z isKFor the value of the short-circuit resistance,
is the impedance angle, Ukr isThe resistance component;
the reactive component is determined according to the following equation:
wherein Z isKFor the value of the short-circuit resistance,
for the impedance angle, Ukx is the reactance component.
3. The method for detecting the deformation of the transformer winding on line according to claim 1, wherein the plurality of standard load power factors are set by the following method:
determining a minimum load power factor, a load power factor value interval and a maximum load power factor of the power transformer;
and determining a plurality of standard load power factors according to the minimum load power factor, the load power factor value interval and the maximum load power factor.
4. The method for detecting the deformation of the transformer winding on line as claimed in claim 3, wherein the plurality of standard operation current values are set by the following way:
determining a minimum operation current value, an operation current value interval and a maximum operation current value of the power transformer;
and determining a plurality of standard operating current values according to the minimum operating current value, the operating current value interval and the maximum operating current value.
5. The method according to claim 4, wherein the establishing a corresponding relationship between the standard load power factor, the standard operating current value and the standard voltage regulation rate according to the rated current, the resistance component, the reactance component, a plurality of preset standard load power factors and a plurality of preset standard operating current values comprises:
determining a target standard voltage regulation rate according to the rated current, the resistance component, the reactance component, the target standard load power factor and the target standard operation current value aiming at any target standard load power factor in a plurality of standard load power factors and any target standard operation current value in a plurality of standard operation current values;
and determining each standard load power factor, each standard operation current value and the corresponding standard voltage regulation rate as the corresponding relation among the standard load power factor, the standard operation current value and the standard voltage regulation rate.
6. The method for detecting the deformation of the transformer winding on line according to claim 5, wherein the step of determining a target standard voltage regulation rate according to the rated current, the resistance component, the reactance component, the target standard load power factor and the target standard operation current value comprises the following steps:
determining a target standard voltage adjustment rate by the following formula:
wherein, INUkr is the resistive component, Ukx is the reactive component for the rated current,
is the target standard load power factor, IEyes of a userFor said target standard operating current value, Δ UEyes of a userTo the target standard voltage regulation rate, the
According to the formula
And (4) determining.
7. An apparatus for on-line detecting deformation of transformer winding, which is used in the method for on-line detecting deformation of transformer winding according to any one of claims 1-6, the apparatus comprising:
the short-circuit impedance value, impedance angle and rated current obtaining module is used for obtaining a short-circuit impedance value and an impedance angle of the power transformer in an initial state and rated current of a load side of the power transformer;
the resistance component and reactance component determining module is used for determining the resistance component and the reactance component of the short-circuit impedance according to the short-circuit impedance value and the impedance angle;
the corresponding relation determining module is used for establishing a corresponding relation among the standard load power factor, the standard operation current value and the standard voltage regulation rate according to the rated current, the resistance component, the reactance component, a plurality of preset standard load power factors and a plurality of preset standard operation current values;
the real-time parameter measuring module is used for measuring a real-time load power factor and a real-time running current value of the power transformer when the power transformer has a short-circuit fault;
the real-time voltage regulation rate determining module is used for determining a real-time voltage regulation rate according to the rated current, the resistance component, the reactance component, the real-time load power factor and the real-time running current value;
a reference standard voltage regulation rate obtaining module, configured to obtain a reference standard voltage regulation rate corresponding to the real-time load power factor and the real-time operating current value from a correspondence between a standard load power factor, a standard operating current value, and a standard voltage regulation rate;
and the transformer winding deformation judging module is used for judging whether the transformer winding deforms after the power transformer has the short-circuit fault, and if the value of the real-time voltage regulation rate is not equal to the value of the reference standard voltage regulation rate, judging that the transformer winding deforms after the power transformer has the short-circuit fault.
8. The apparatus of claim 7, wherein the resistance component and reactance component determining module comprises:
a resistance component determination unit for determining a resistance component according to the following formula:
wherein Z isKFor the value of the short-circuit resistance,
ukr is the resistance component for the impedance angle;
a reactance component determination unit for determining a reactance component according to the following formula:
wherein Z isKFor the value of the short-circuit resistance,
for the impedance angle, Ukx is the reactance component.
9. The device for detecting the deformation of the transformer winding on line according to claim 7, wherein the correspondence determining module comprises:
the standard load power factor presetting unit is used for presetting a plurality of standard load power factors;
the standard operating current value presetting unit is used for presetting a plurality of standard operating current values;
a target standard voltage adjustment rate obtaining unit, configured to determine a target standard voltage adjustment rate according to the rated current, the resistance component, the reactance component, the target standard load power factor, and a target standard operation current value, for any one of a plurality of standard load power factors and any one of a plurality of standard operation current values;
and the corresponding relation establishing unit is used for establishing the corresponding relation among the standard load power factor, the standard running current value and the standard voltage regulation rate.
10. The device for detecting the deformation of the winding of the transformer on line as claimed in claim 9, wherein the target standard voltage regulation rate obtaining unit determines the target standard voltage regulation rate by the following formula:
wherein, INUkr is the resistive component, Ukx is the reactive component for the rated current,
is the target standard load power factor, IEyes of a userFor said target standard operating current value, Δ UEyes of a userTo the target standard voltage regulation rate, the
According to the formula
And (4) determining.
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