CN115980476A - Transformer running state evaluation method and device based on short circuit impact - Google Patents
Transformer running state evaluation method and device based on short circuit impact Download PDFInfo
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Abstract
The invention discloses a transformer running state evaluation method and device based on short circuit impact, which comprises the steps of monitoring the currents of bus breakers on three sides of a transformer in a fault wave recording device in real time through the fault wave recording device in a transformer substation, and collecting the short circuit current peak values on three sides of the transformer in the fault wave recording device when the situation that the transformer trips is monitored, wherein the three sides of the transformer comprise a high-voltage side of the transformer, a medium-voltage side of the transformer and a low-voltage side of the transformer; respectively calculating short-circuit current impact coefficients corresponding to three sides of the transformer according to the three-side short-circuit current peak values of the transformer; and calculating a short-circuit resistance loss value after the short-circuit impact of the transformer according to the short-circuit current impact coefficient, accumulating the short-circuit resistance loss value to obtain and obtain an operation state evaluation result of the transformer and a corresponding operation and maintenance strategy based on a total short-circuit resistance loss value, so that the reliable operation of the transformer can be ensured, and the risk potential can be found in advance.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a method and a device for evaluating the running state of a transformer based on short-circuit impact.
Background
The power transformer is an important device in a power grid, and the stable and reliable operation of the transformer plays an important role in the safety of the power grid.
The insufficient short-circuit resistance of the transformer is a main fault type of the transformer, wherein most of the short-circuit resistance is caused after the transformer is subjected to multiple short-circuit impacts. For the evaluation of the transformer after multiple short circuit impacts, at present, methods such as simulation, development of a true transformer test, development of a material test and the like are adopted, but a special calculation model is rarely used for calculating the problem and providing different disposal strategies.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method and the device for evaluating the running state of the transformer based on the short-circuit impact evaluate the running state of the transformer in real time according to the short-circuit impact condition of the transformer, and push an operation and maintenance strategy, so that the running reliability of the transformer is improved.
In order to solve the technical problem, the invention provides a transformer running state evaluation method based on short circuit impact, which comprises the following steps:
judging whether a transformer substation is provided with a fault recording device or not, if so, monitoring the currents of bus breakers on three sides of a transformer in the fault recording device in real time, and acquiring the short-circuit current peak values of the three sides of the transformer in the fault recording device when the situation that the transformer is tripped is monitored, wherein the three sides of the transformer comprise a high-voltage side of the transformer, a medium-voltage side of the transformer and a low-voltage side of the transformer;
respectively calculating short-circuit current impact coefficients corresponding to three sides of the transformer according to the three-side short-circuit current peak values of the transformer;
and calculating a short-circuit resistance loss value after the short-circuit impact of the transformer according to the short-circuit current impact coefficient, accumulating the short-circuit resistance loss value, and obtaining an operation state evaluation result of the transformer and a corresponding operation and maintenance strategy based on a total short-circuit resistance loss value.
In a possible implementation manner, calculating short-circuit current impact coefficients corresponding to three sides of the transformer according to the peak values of the short-circuit current on the three sides of the transformer respectively includes:
respectively obtaining maximum allowable short-circuit current peak values corresponding to three side windings of a transformer, wherein the three side windings of the transformer comprise a high-voltage side winding of the transformer, a medium-voltage side winding of the transformer and a low-voltage side winding of the transformer;
and respectively calculating the ratio of the short-circuit current peak values on the three sides of the transformer to the maximum allowable short-circuit current peak value corresponding to the windings on the three sides of the transformer, and taking the ratio as the short-circuit current impact coefficient corresponding to the three sides of the transformer.
In a possible implementation manner, after determining whether the substation has the fault recording device, the method further includes:
if the transformer substation does not have the fault recording device, reading circuit current effective values corresponding to three sides of the transformer, which are obtained by a protection device in the transformer substation;
and selecting a preset short-circuit current peak value coefficient based on the power grid voltage grade corresponding to the transformer, and obtaining the three-side short-circuit current peak value of the transformer according to the circuit current effective value and the preset short-circuit current peak value coefficient.
In a possible implementation manner, a preset short-circuit current peak coefficient is selected based on a power grid voltage level corresponding to a transformer, and the method specifically includes:
acquiring a power grid voltage grade corresponding to the transformer, wherein the selected preset short-circuit current peak coefficient is 2.55 when the power grid voltage grade is 110kV, and the selected preset short-circuit current peak coefficient is 2.69 when the power grid voltage grade is greater than or equal to 220 kV.
In a possible implementation manner, calculating a short-circuit capability loss resistance value after a short-circuit impact of the transformer according to the short-circuit current impact coefficient specifically includes:
acquiring the operation age coefficient of the transformer and the short circuit impact frequency of the transformer continuously suffering from short circuit impact within a preset time;
substituting the operation age coefficient, the short circuit impact frequency and the short circuit current impact coefficient corresponding to three sides of the transformer into a preset short circuit resistance loss value calculation formula, and calculating and obtaining a short circuit resistance loss value after the short circuit impact of the transformer;
wherein, the preset short-circuit resistance loss value calculation formula is as follows:
LOSS＝A·T·e max(CH,CM,CL)·N ；
in the formula, A is a constant, 1.67 is taken, T is a transformer operation age coefficient, N is a short-circuit impact frequency, CH is a short-circuit current impact coefficient of a transformer high-voltage side, CM is a short-circuit current impact coefficient of a transformer medium-voltage side, and CL is a short-circuit current impact coefficient of a transformer low-voltage side.
In a possible implementation manner, obtaining the operation age coefficient of the transformer specifically includes:
the method comprises the steps of obtaining the operation age of the transformer, determining the operation age grade corresponding to the current operation age based on the operation age grade divided in advance, and matching the corresponding operation age coefficient based on the operation age grade.
In a possible implementation manner, obtaining and obtaining an operation state evaluation result of the transformer and a corresponding operation and maintenance strategy based on the total loss value of the short-circuit resistance specifically includes:
determining the grade of the total loss value of the short-circuit resisting capability corresponding to the current total loss value of the short-circuit resisting capability based on the grade of the total loss value of the short-circuit resisting capability divided in advance;
and matching the corresponding evaluation result of the running state of the transformer and the operation and maintenance strategy thereof based on the grade of the total loss value of the short circuit resistance.
The invention also provides a transformer running state evaluation device based on short circuit impact, which comprises: the short-circuit current impact coefficient acquisition module is used for acquiring the impact coefficient of the short-circuit current;
the short-circuit current peak value acquisition module is used for judging whether a transformer substation is provided with a fault wave recording device or not, if so, monitoring the current of bus breakers on three sides of a transformer in the fault wave recording device in real time, and acquiring the short-circuit current peak values on three sides of the transformer in the fault wave recording device when the situation that the transformer is tripped is monitored, wherein the three sides of the transformer comprise a high-voltage side of the transformer, a medium-voltage side of the transformer and a low-voltage side of the transformer;
the short-circuit current impact coefficient acquisition module is used for respectively calculating the short-circuit current impact coefficients corresponding to three sides of the transformer according to the short-circuit current peak values of the three sides of the transformer;
and the running state evaluation module is used for calculating a short-circuit resistance loss value after the short-circuit impact of the transformer according to the short-circuit current impact coefficient, accumulating the short-circuit resistance loss value, and obtaining a running state evaluation result of the transformer and a corresponding operation and maintenance strategy based on a total short-circuit resistance loss value.
In a possible implementation manner, the short-circuit current impact coefficient obtaining module is configured to calculate short-circuit current impact coefficients corresponding to three sides of the transformer according to the peak values of the short-circuit currents at the three sides of the transformer, and specifically includes:
respectively obtaining maximum allowable short-circuit current peak values corresponding to three side windings of a transformer, wherein the three side windings of the transformer comprise a high-voltage side winding of the transformer, a medium-voltage side winding of the transformer and a low-voltage side winding of the transformer;
and respectively calculating the ratio of the short-circuit current peak values on the three sides of the transformer to the maximum allowable short-circuit current peak value corresponding to the windings on the three sides of the transformer, and taking the ratio as the short-circuit current impact coefficient corresponding to the three sides of the transformer.
In a possible implementation manner, the short-circuit current peak value obtaining module is configured to, after determining whether the substation has the fault recording device, further:
if the transformer substation does not have the fault recording device, reading circuit current effective values corresponding to three sides of the transformer, which are obtained by a protection device in the transformer substation;
and selecting a preset short-circuit current peak value coefficient based on the power grid voltage grade corresponding to the transformer, and obtaining the three-side short-circuit current peak value of the transformer according to the circuit current effective value and the preset short-circuit current peak value coefficient.
In a possible implementation manner, the short-circuit current peak obtaining module is configured to select a preset short-circuit current peak coefficient based on a power grid voltage level corresponding to the transformer, and specifically includes:
obtaining a power grid voltage grade corresponding to a transformer, wherein the selected preset short-circuit current peak value coefficient is 2.55 when the power grid voltage grade is 110kV, and the selected preset short-circuit current peak value coefficient is 2.69 when the power grid voltage grade is greater than or equal to 220 kV.
In a possible implementation manner, the operation state evaluation module is configured to calculate a short-circuit capability loss resistance value after a short-circuit impact of the transformer according to the short-circuit current impact coefficient, and specifically includes:
acquiring the operation age coefficient of the transformer and the short circuit impact frequency of the transformer continuously suffering from short circuit impact within a preset time;
substituting the operation age coefficient, the short circuit impact frequency and the short circuit current impact coefficient corresponding to three sides of the transformer into a preset short circuit resistance loss value calculation formula, and calculating and obtaining a short circuit resistance loss value after the short circuit impact of the transformer;
wherein, the preset short-circuit resistance loss value calculation formula is as follows:
LOSS＝A·T·e max(CH,CM,CL)·N ；
in the formula, A is a constant, 1.67 is taken, T is a transformer operation age coefficient, N is a short-circuit impact frequency, CH is a short-circuit current impact coefficient of a transformer high-voltage side, CM is a short-circuit current impact coefficient of a transformer medium-voltage side, and CL is a short-circuit current impact coefficient of a transformer low-voltage side.
In a possible implementation manner, the operation state evaluation module is configured to obtain an operation age coefficient of the transformer, and specifically includes:
the method comprises the steps of obtaining the operation age of the transformer, determining the operation age grade corresponding to the current operation age based on the operation age grade divided in advance, and matching the corresponding operation age coefficient based on the operation age grade.
In a possible implementation manner, the operation state evaluation module is configured to obtain and obtain an operation state evaluation result of the transformer and a corresponding operation and maintenance policy based on a total short-circuit resistance loss value, and specifically includes:
determining the grade of the total loss value of the short-circuit resisting capability corresponding to the current total loss value of the short-circuit resisting capability based on the grade of the total loss value of the short-circuit resisting capability divided in advance;
and matching the corresponding evaluation result of the running state of the transformer and the operation and maintenance strategy thereof based on the grade of the total loss value of the short circuit resistance.
The invention also provides a terminal device, which comprises a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to realize the short-circuit impact based transformer operation state evaluation method.
The invention also provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the method for evaluating the running state of the transformer based on short-circuit impact.
Compared with the prior art, the method and the device for evaluating the running state of the transformer based on short circuit impact have the following beneficial effects:
monitoring the currents of bus circuit breakers on three sides of a transformer in a fault wave recording device in real time through the fault wave recording device, and collecting the short-circuit current peak values on three sides of the transformer in the fault wave recording device when the condition that the transformer trips is monitored, wherein the three sides of the transformer comprise a high-voltage side of the transformer, a medium-voltage side of the transformer and a low-voltage side of the transformer; respectively calculating short-circuit current impact coefficients corresponding to three sides of the transformer according to the short-circuit current peak values of the three sides of the transformer; calculating a short-circuit resistance loss value after the short-circuit impact of the transformer according to the short-circuit current impact coefficient, accumulating the short-circuit resistance loss value to obtain and obtain an operation state evaluation result of the transformer and a corresponding operation and maintenance strategy based on a total short-circuit resistance loss value; the method can evaluate the running state of the transformer in real time according to the short circuit impact condition of the transformer, and push the operation and maintenance strategy, thereby ensuring the reliable running of the transformer and finding the risk hidden danger in advance.
Drawings
FIG. 1 is a schematic flow chart diagram illustrating an embodiment of a method for evaluating an operating state of a transformer based on short-circuit impact according to the present invention;
fig. 2 is a schematic structural diagram of an embodiment of a transformer operating state evaluation device based on short-circuit impact according to the present invention.
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 present application, 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.
Example 1
Referring to fig. 1, fig. 1 is a schematic flowchart of an embodiment of a method for evaluating an operating state of a transformer based on short-circuit impact according to the present invention, as shown in fig. 1, the method includes steps 101 to 104, which are as follows:
step 101: judging whether a transformer substation is provided with a fault recording device, if so, monitoring the currents of bus breakers on three sides of a transformer in the fault recording device in real time, and acquiring the short-circuit current peak values on three sides of the transformer in the fault recording device when the situation of tripping in the transformer is monitored, wherein the three sides of the transformer comprise a high-voltage side of the transformer, a medium-voltage side of the transformer and a low-voltage side of the transformer.
In an embodiment, when a substation is provided with a fault recorder, the bus breaker currents on three sides of a transformer in the fault recorder are monitored in real time, and specifically, the bus breaker current on the high-voltage side of the transformer, the bus breaker current on the medium-voltage side of the transformer and the bus breaker current on the low-voltage side of the transformer in the fault recorder are detected in real time.
In an embodiment, since the resistance value is close to 0 in a short circuit, theoretically, the current may reach infinity, and therefore, the tripping condition of each side circuit or the tripping condition of the transformer can be detected in real time by monitoring the currents of the bus breakers on three sides of the transformer in the fault recorder in real time and based on the change of the currents of the bus breakers on three sides of the transformer.
In one embodiment, when a tripping condition exists in the transformer, three-side short-circuit current peak values of the transformer in the fault recording device are collected, wherein the three-side short-circuit current peak values of the transformer comprise a high-voltage-side short-circuit current peak value I of the transformer Ht And the current peak value I of the short-circuit at the medium-voltage side of the transformer Mt And the current peak value I of the short-circuit at the low-voltage side of the transformer Lt 。
In one embodiment, when the transformer substation does not have a fault recording device, the effective values of circuit currents corresponding to three sides of the transformer, which are obtained by a protection device in the transformer substation, are read; the effective circuit current values corresponding to the three sides of the transformer comprise an effective circuit current value corresponding to the high-voltage side of the transformer, an effective circuit current value corresponding to the medium-voltage side of the transformer and an effective circuit current value corresponding to the low-voltage side of the transformer.
In an embodiment, a preset short-circuit current peak coefficient is selected based on a power grid voltage level corresponding to a transformer, specifically, the power grid voltage level corresponding to the transformer is obtained, when the power grid voltage level is 110kV, the selected preset short-circuit current peak coefficient is 2.55, and when the power grid voltage level is greater than or equal to 220kV, the selected preset short-circuit current peak coefficient is 2.69.
In one embodiment, the three-side short-circuit current peak value of the transformer is obtained according to the circuit current effective value and the preset short-circuit current peak value coefficient. Specifically, the effective values of the circuit currents corresponding to the three sides of the transformer are multiplied by the preset peak value coefficients of the short-circuit current, so as to obtain the peak value of the short-circuit current of the three sides of the transformer.
Step 102: and respectively calculating the short-circuit current impact coefficients corresponding to the three sides of the transformer according to the three-side short-circuit current peak values of the transformer.
In one embodiment, maximum allowable short-circuit current peak values corresponding to three side windings of a transformer are respectively obtained, wherein the maximum allowable short-circuit current peak values corresponding to the three side windings of the transformer include a maximum allowable short-circuit current peak value I corresponding to a high-voltage side winding of the transformer H Maximum allowable short-circuit current peak value I corresponding to medium-voltage side winding of transformer M Maximum allowable short-circuit current peak value I corresponding to low-voltage side winding of transformer L 。
Preferably, the maximum allowable short-circuit current is calculated more complicated, the influence on working conditions is more considered, and the calculation can be performed according to the method of the application guide rule of the national standard GBT13499-2007 power transformer for facilitating practical operation.
In one embodiment, the ratio of the short-circuit current peak value on three sides of the transformer to the maximum allowable short-circuit current peak value corresponding to the winding on three sides of the transformer is calculated respectively, and the ratio is used as the short-circuit current impact coefficient corresponding to three sides of the transformer.
Specifically, the short-circuit current impact coefficient corresponding to the three sides of the transformer comprises a short-circuit current impact coefficient C corresponding to the high-voltage side of the transformer H Short-circuit current impact coefficient C corresponding to medium-voltage side of transformer M Short-circuit current impact coefficient C corresponding to low-voltage side of transformer L 。
Wherein for short-circuit corresponding to high-voltage side of transformerCurrent impact coefficient C H Calculating the short-circuit current peak value I of the high-voltage side of the transformer Ht Maximum allowable short-circuit current peak value I corresponding to high-voltage side winding of transformer H The calculation formula of the ratio of (a) is as follows:
C H ＝I Ht /I H 。
wherein, the short-circuit current impact coefficient C corresponding to the medium-voltage side of the transformer M Calculating the peak value I of the short-circuit current at the medium-voltage side of the transformer Mt Maximum allowable short-circuit current peak value I corresponding to medium-voltage side winding of transformer M The calculation formula of the ratio of (a) is as follows:
C M ＝I Mt /I M 。
wherein, the short-circuit current impact coefficient C corresponding to the low voltage of the transformer L Calculating the short-circuit current peak value I of the low-voltage side of the transformer Lt Maximum allowable short-circuit current peak value I corresponding to low-voltage side winding of transformer L The calculation formula of the ratio of (a) is as follows:
C L ＝I Lt /I L 。
step 103: and calculating a short-circuit resistance loss value after the short-circuit impact of the transformer according to the short-circuit current impact coefficient, accumulating the short-circuit resistance loss value, and obtaining an operation state evaluation result of the transformer and a corresponding operation and maintenance strategy based on a total short-circuit resistance loss value.
In one embodiment, according to the short-circuit current impact coefficient, calculating a short-circuit resistance loss value after short-circuit impact of the transformer; specifically, the operation age coefficient of the transformer and the short circuit impact frequency of the transformer continuously suffering from short circuit impact within a preset time are obtained; substituting the operation age coefficient, the short circuit impact times and the short circuit current impact coefficient corresponding to three sides of the transformer into a preset short circuit resistance Loss value calculation formula, and calculating and obtaining a short circuit resistance Loss value Loss after the short circuit impact of the transformer;
wherein, the preset short-circuit resistance loss value calculation formula is as follows:
Loss＝A·T·e max(CH,CM,CL)·N ；
in the formula, A is a constant, 1.67 is taken, T is a transformer operation age coefficient, N is a short-circuit impact frequency, CH is a short-circuit current impact coefficient of a transformer high-voltage side, CM is a short-circuit current impact coefficient of a transformer medium-voltage side, and CL is a short-circuit current impact coefficient of a transformer low-voltage side.
Preferably, the short circuit impact frequency of the transformer continuously suffering from short circuit impact within a preset time is acquired by a wave recorder device in the transformer substation; the preset time is five minutes.
In an embodiment, the operation age coefficient of the transformer is obtained, specifically, the operation age of the transformer is obtained, the operation age grade corresponding to the current operation age is determined based on the operation age grades divided in advance, and the corresponding operation age coefficient is matched based on the operation age grade.
Preferably, the pre-divided operational age classes include: first-stage operation age, second-stage operation age, third-stage operation age, fourth-stage operation age, fifth-stage operation age, and sixth-stage operation age.
Wherein, the first-level operation age limit: when the operation period of the transformer is less than or equal to 5 years, T =5; secondary operation age: when the operation period of the transformer is more than 5 and less than or equal to 10 years, T =10; third-stage operation life: when the operation period of the transformer is more than 10 and less than or equal to 15 years, T =15; four-stage operation age: when the operation period of the transformer is more than 15 and less than or equal to 20 years, T =20; five-stage operation age: when the operation period of the transformer is more than 20 and less than or equal to 25 years, T =25; six-stage operation age: t =30 when the operational age of the transformer is > 25 years.
In an embodiment, the short-circuit resistance loss value is accumulated to obtain and is based on a short-circuit resistance total loss value, wherein an accumulation calculation formula is as follows:
TotalLoss＝∑Loss。
preferably, the step of accumulating the short-circuit resistance loss values refers to accumulating the short-circuit resistance loss values acquired in all time since the transformer is put into operation.
In one embodiment, the level of the total loss value of the short-circuit resistance corresponding to the current total loss value of the short-circuit resistance is determined based on the pre-divided level of the total loss value of the short-circuit resistance, and the corresponding evaluation result of the running state of the transformer is matched.
Preferably, the pre-divided grades of the total loss value of the short-circuit resistance capability are a first grade of the total loss value of the short-circuit resistance capability, a second grade of the total loss value of the short-circuit resistance capability, a third grade of the total loss value of the short-circuit resistance capability and a fourth grade of the total loss value of the short-circuit resistance capability.
Specifically, when the totaloss is larger than or equal to 180, determining that the level of the total loss value of the short-circuit resisting capacity corresponding to the current total loss value of the short-circuit resisting capacity is a first level of the total loss value of the short-circuit resisting capacity, and judging that the running state of the transformer is serious by matching the running state evaluation result of the transformer and the operation and maintenance strategy thereof, wherein the condition that the transformer needs to be subjected to power failure check as soon as possible is indicated; the checking content comprises the following steps: the method comprises the following steps of transformer oil chromatography test, winding deformation frequency response test, low-voltage short circuit impedance test, transformer core suspension inspection, factory return reinforcement and the like.
Specifically, when the totaloss is greater than or equal to 60, determining that the level of the total loss value of the short-circuit resisting capability corresponding to the current total loss value of the short-circuit resisting capability is a second level of the total loss value of the short-circuit resisting capability, and matching the evaluation result of the running state of the transformer and the operation and maintenance strategy thereof to judge the attention of the running state of the transformer to indicate that the transformer needs to be subjected to power failure check as soon as possible; the checking content comprises the following steps: transformer oil chromatography test, winding deformation frequency response test, low-voltage short circuit impedance test and the like.
Specifically, when the totaloss is larger than or equal to 30, the level of the total loss value of the short-circuit resistance corresponding to the current total loss value of the short-circuit resistance is determined to be the level of the third total loss value of the short-circuit resistance, the running state evaluation result of the transformer and the operation and maintenance strategy of the transformer are matched to judge that the running state of the transformer is abnormal, the tracking is enhanced, and at least 2 times of transformer oil chromatography tests are performed in Zhou Nakai.
Specifically, when totaloss is less than 30, the level of the total loss value of the short-circuit resistance corresponding to the current total loss value of the short-circuit resistance is determined to be the level of the total loss value of the short-circuit resistance, the running state evaluation result of the transformer and the operation and maintenance strategy thereof are matched to judge that the running state of the transformer is normal, the short-circuit impact is acceptable, and the transformer can run safely.
Example 2
Referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of a transformer operating state evaluation apparatus based on short-circuit impact, as shown in fig. 2, the apparatus includes a short-circuit current peak value obtaining module 201, a short-circuit current impact coefficient obtaining module 202, and an operating state evaluation module 203, specifically as follows:
the short-circuit current peak value acquisition module 201 is configured to determine whether a transformer substation is provided with a fault wave recording device, monitor bus breaker currents on three sides of a transformer in the fault wave recording device in real time if the fault wave recording device is provided with the fault wave recording device, and acquire a short-circuit current peak value on three sides of the transformer in the fault wave recording device when a tripping condition exists in the transformer, where the three sides of the transformer include a transformer high-voltage side, a transformer medium-voltage side and a transformer low-voltage side;
the short-circuit current impact coefficient obtaining module 202 is configured to calculate short-circuit current impact coefficients corresponding to three sides of the transformer according to the peak values of the short-circuit currents on the three sides of the transformer;
and the operation state evaluation module 203 is configured to calculate a short-circuit resistance loss value after short-circuit impact of the transformer according to the short-circuit current impact coefficient, accumulate the short-circuit resistance loss value, and obtain an operation state evaluation result of the transformer and a corresponding operation and maintenance strategy based on a total short-circuit resistance loss value.
In an embodiment, the short-circuit current impact coefficient obtaining module 202 is configured to calculate short-circuit current impact coefficients corresponding to three sides of the transformer according to the peak values of the short-circuit current on the three sides of the transformer, and specifically includes: respectively obtaining maximum allowable short-circuit current peak values corresponding to three side windings of a transformer, wherein the three side windings of the transformer comprise a high-voltage side winding of the transformer, a medium-voltage side winding of the transformer and a low-voltage side winding of the transformer; and respectively calculating the ratio of the short-circuit current peak values on the three sides of the transformer to the maximum allowable short-circuit current peak value corresponding to the windings on the three sides of the transformer, and taking the ratio as the short-circuit current impact coefficient corresponding to the three sides of the transformer.
In an embodiment, the short-circuit current peak value obtaining module 201 is configured to, after determining whether the substation has a fault recording device, further: if the transformer substation does not have the fault recording device, reading circuit current effective values corresponding to three sides of the transformer, which are obtained by a protection device in the transformer substation; and selecting a preset short-circuit current peak value coefficient based on the power grid voltage grade corresponding to the transformer, and obtaining the three-side short-circuit current peak value of the transformer according to the circuit current effective value and the preset short-circuit current peak value coefficient.
In an embodiment, the short-circuit current peak obtaining module 201 is configured to select a preset short-circuit current peak coefficient based on a power grid voltage class corresponding to the transformer, and specifically includes: acquiring a power grid voltage grade corresponding to the transformer, wherein the selected preset short-circuit current peak coefficient is 2.55 when the power grid voltage grade is 110kV, and the selected preset short-circuit current peak coefficient is 2.69 when the power grid voltage grade is greater than or equal to 220 kV.
In an embodiment, the operation state evaluation module 203 is configured to calculate a short-circuit capability loss resistance value after a short-circuit impact of the transformer according to the short-circuit current impact coefficient, and specifically includes: acquiring the operation age coefficient of the transformer and the short circuit impact frequency of the transformer continuously suffering from short circuit impact within a preset time; substituting the operation age coefficient, the short circuit impact frequency and the short circuit current impact coefficient corresponding to three sides of the transformer into a preset short circuit resistance loss value calculation formula, and calculating and obtaining a short circuit resistance loss value after the short circuit impact of the transformer; wherein, the preset short-circuit resistance loss value calculation formula is as follows:
LOSS＝A·T·e max(CH,CM,CL)·N ；
in the formula, A is a constant, 1.67 is taken, T is a transformer operation age coefficient, N is a short-circuit impact frequency, CH is a short-circuit current impact coefficient of a transformer high-voltage side, CM is a short-circuit current impact coefficient of a transformer medium-voltage side, and CL is a short-circuit current impact coefficient of a transformer low-voltage side.
In an embodiment, the operation state evaluation module 203 is configured to obtain an operation age coefficient of the transformer, and specifically includes: the method comprises the steps of obtaining the operation age of the transformer, determining the operation age grade corresponding to the current operation age based on the operation age grade divided in advance, and matching the corresponding operation age coefficient based on the operation age grade.
In an embodiment, the operation state evaluation module 203 is configured to obtain and obtain an operation state evaluation result of the transformer and a corresponding operation and maintenance policy based on a total loss value of the short-circuit resistance, and specifically includes: determining the grade of the total loss value of the short-circuit resisting capability corresponding to the current total loss value of the short-circuit resisting capability based on the grade of the total loss value of the short-circuit resisting capability divided in advance; and matching the corresponding evaluation result of the running state of the transformer and the operation and maintenance strategy thereof based on the grade of the total loss value of the short circuit resistance.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working process of the apparatus described above may refer to the corresponding process in the foregoing method embodiment, and is not described herein again.
It should be noted that the above-mentioned embodiment of the device for evaluating the operation state of the transformer based on short-circuit impact is merely illustrative, wherein the modules described as the separate components may or may not be physically separate, and the components displayed as the modules may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
On the basis of the above-mentioned embodiment of the short-circuit impact-based transformer operating state evaluation method, another embodiment of the present invention provides a short-circuit impact-based transformer operating state evaluation terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the short-circuit impact-based transformer operating state evaluation method according to any one of the embodiments of the present invention is implemented.
Illustratively, the computer program may be partitioned in this embodiment into one or more modules that are stored in the memory and executed by the processor to implement the invention. The one or more modules may be a series of instruction segments of a computer program capable of performing specific functions, and the instruction segments are used for describing the execution process of the computer program in the short-circuit impact based transformer operation state evaluation terminal device.
The transformer operation state evaluation terminal device based on short circuit impact can be a desktop computer, a notebook computer, a palm computer, a cloud server and other computing devices. The transformer operation state evaluation terminal equipment based on short circuit impact can comprise, but is not limited to, a processor and a memory.
The processor may be a Central Processing Unit (CPU), other general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like, and the processor is a control center of the short-circuit impact based transformer operation state evaluation terminal device, and various interfaces and lines are used to connect various parts of the whole short-circuit impact based transformer operation state evaluation terminal device.
The memory can be used for storing the computer program and/or the module, and the processor can realize various functions of the short-circuit impact based transformer operation state evaluation terminal equipment by operating or executing the computer program and/or the module stored in the memory and calling data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to the use of the mobile phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
On the basis of the above embodiment of the short-circuit impact based transformer operating state evaluation method, another embodiment of the present invention provides a storage medium, where the storage medium includes a stored computer program, and when the computer program runs, a device on which the storage medium is located is controlled to execute the short-circuit impact based transformer operating state evaluation method according to any one of the embodiments of the present invention.
In this embodiment, the storage medium is a computer-readable storage medium, and the computer program includes computer program code, which may be in source code form, object code form, executable file or some intermediate form, and so on. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, etc. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
In summary, the invention provides a method and a device for evaluating the running state of a transformer based on short circuit impact, wherein the current of bus breakers on three sides of the transformer in a fault recording device is monitored in real time through the fault recording device in the transformer substation, and when the situation of tripping in the transformer is monitored, the peak value of the short circuit current on three sides of the transformer in the fault recording device is collected, wherein the three sides of the transformer comprise a high-voltage side of the transformer, a medium-voltage side of the transformer and a low-voltage side of the transformer; respectively calculating short-circuit current impact coefficients corresponding to three sides of the transformer according to the three-side short-circuit current peak values of the transformer; and calculating a short-circuit resistance loss value after the short-circuit impact of the transformer according to the short-circuit current impact coefficient, accumulating the short-circuit resistance loss value to obtain and obtain an operation state evaluation result of the transformer and a corresponding operation and maintenance strategy based on a total short-circuit resistance loss value, so that the reliable operation of the transformer can be ensured, and the risk potential can be found in advance.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A transformer running state evaluation method based on short circuit impact is characterized by comprising the following steps:
judging whether a transformer substation is provided with a fault recording device or not, if so, monitoring the currents of bus breakers on three sides of a transformer in the fault recording device in real time, and acquiring the short-circuit current peak values of the three sides of the transformer in the fault recording device when the situation that the transformer is tripped is monitored, wherein the three sides of the transformer comprise a high-voltage side of the transformer, a medium-voltage side of the transformer and a low-voltage side of the transformer;
respectively calculating short-circuit current impact coefficients corresponding to three sides of the transformer according to the short-circuit current peak values of the three sides of the transformer;
and calculating a short-circuit resistance loss value after the short-circuit impact of the transformer according to the short-circuit current impact coefficient, accumulating the short-circuit resistance loss value, and obtaining an operation state evaluation result of the transformer and a corresponding operation and maintenance strategy based on a total short-circuit resistance loss value.
2. The method according to claim 1, wherein the step of calculating the short-circuit current impact coefficients corresponding to three sides of the transformer according to the short-circuit current peak values of the three sides of the transformer comprises:
respectively obtaining maximum allowable short-circuit current peak values corresponding to three side windings of a transformer, wherein the three side windings of the transformer comprise a high-voltage side winding of the transformer, a medium-voltage side winding of the transformer and a low-voltage side winding of the transformer;
and respectively calculating the ratio of the short-circuit current peak values on the three sides of the transformer to the maximum allowable short-circuit current peak value corresponding to the windings on the three sides of the transformer, and taking the ratio as the short-circuit current impact coefficient corresponding to the three sides of the transformer.
3. The method for evaluating the running state of the transformer based on the short circuit impact as claimed in claim 1, wherein after judging whether the transformer substation has a fault recording device, the method further comprises:
if the transformer substation does not have the fault recording device, reading circuit current effective values corresponding to three sides of the transformer, which are obtained by a protection device in the transformer substation;
and selecting a preset short-circuit current peak value coefficient based on the power grid voltage grade corresponding to the transformer, and obtaining the three-side short-circuit current peak value of the transformer according to the circuit current effective value and the preset short-circuit current peak value coefficient.
4. The method for evaluating the operation state of the transformer based on the short circuit impact as claimed in claim 3, wherein the step of selecting the preset short circuit current peak value coefficient based on the power grid voltage level corresponding to the transformer specifically comprises:
obtaining a power grid voltage grade corresponding to a transformer, wherein the selected preset short-circuit current peak value coefficient is 2.55 when the power grid voltage grade is 110kV, and the selected preset short-circuit current peak value coefficient is 2.69 when the power grid voltage grade is greater than or equal to 220 kV.
5. The method for evaluating the running state of the transformer based on the short-circuit impact as claimed in claim 1, wherein the step of calculating the short-circuit resistance loss value of the transformer after the short-circuit impact according to the short-circuit current impact coefficient specifically comprises the following steps:
acquiring the operation age coefficient of the transformer and the short circuit impact frequency of the transformer continuously suffering from short circuit impact within a preset time;
substituting the operation age coefficient, the short circuit impact frequency and the short circuit current impact coefficient corresponding to three sides of the transformer into a preset short circuit resistance loss value calculation formula, and calculating and obtaining a short circuit resistance loss value after the short circuit impact of the transformer;
wherein, the preset short-circuit resistance loss value calculation formula is as follows:
LOSS＝A·T·e max(CH,CM,CL)·N ；
in the formula, A is a constant, 1.67 is taken, T is a transformer operation age coefficient, N is a short-circuit impact frequency, CH is a short-circuit current impact coefficient of a transformer high-voltage side, CM is a short-circuit current impact coefficient of a transformer medium-voltage side, and CL is a short-circuit current impact coefficient of a transformer low-voltage side.
6. The method for evaluating the operating state of the transformer based on the short circuit impact as claimed in claim 5, wherein the obtaining of the operating age coefficient of the transformer specifically comprises:
the method comprises the steps of obtaining the operation age of the transformer, determining the operation age grade corresponding to the current operation age based on the operation age grade divided in advance, and matching the corresponding operation age coefficient based on the operation age grade.
7. The method for evaluating the operation state of the transformer based on the short-circuit impact as claimed in claim 1, wherein the obtaining of the operation state evaluation result of the transformer and the corresponding operation and maintenance strategy based on the total loss value of the short-circuit resisting capability specifically comprises:
determining the grade of the total loss value of the short-circuit resisting capability corresponding to the current total loss value of the short-circuit resisting capability based on the grade of the total loss value of the short-circuit resisting capability divided in advance;
and matching the corresponding evaluation result of the running state of the transformer and the operation and maintenance strategy thereof based on the grade of the total loss value of the short circuit resistance.
8. A transformer running state evaluation device based on short circuit impact is characterized by comprising: the short-circuit current impact coefficient acquisition module is used for acquiring the impact coefficient of the short-circuit current;
the short-circuit current peak value acquisition module is used for judging whether a transformer substation is provided with a fault wave recording device or not, if so, monitoring the current of bus breakers on three sides of a transformer in the fault wave recording device in real time, and acquiring the short-circuit current peak values on three sides of the transformer in the fault wave recording device when the situation that the transformer is tripped is monitored, wherein the three sides of the transformer comprise a high-voltage side of the transformer, a medium-voltage side of the transformer and a low-voltage side of the transformer;
the short-circuit current impact coefficient acquisition module is used for respectively calculating the short-circuit current impact coefficients corresponding to three sides of the transformer according to the short-circuit current peak values of the three sides of the transformer;
and the running state evaluation module is used for calculating a short-circuit resistance loss value after the short-circuit impact of the transformer according to the short-circuit current impact coefficient, accumulating the short-circuit resistance loss value, and obtaining a running state evaluation result of the transformer and a corresponding operation and maintenance strategy based on a total short-circuit resistance loss value.
9. A terminal device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor, when executing the computer program, implements the short-circuit impact based transformer operating state evaluation method according to any one of claims 1 to 7.
10. A computer-readable storage medium, comprising a stored computer program, wherein when the computer program is executed, the computer-readable storage medium is controlled to implement the method for evaluating an operation state of a transformer based on short-circuit impact according to any one of claims 1 to 7.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116522739A (en) * | 2023-06-29 | 2023-08-01 | 南昌科晨电力试验研究有限公司 | Transformer short-circuit impact control method and system based on data analysis |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116522739A (en) * | 2023-06-29 | 2023-08-01 | 南昌科晨电力试验研究有限公司 | Transformer short-circuit impact control method and system based on data analysis |
| CN116522739B (en) * | 2023-06-29 | 2023-09-26 | 南昌科晨电力试验研究有限公司 | Transformer short-circuit impact control method and system based on data analysis |
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