Large current transformer calibration system

Abstract

The present invention relates to the technical field of transformer calibration, and discloses a large current transformer calibration system comprising a basic parameter calibration module, a temperature calibration module, a dynamic stability calibration module, and a comprehensive evaluation module. The basic parameter calibration module comprises a voltage and current data acquisition unit, a voltage and current data analysis unit, and a transformer voltage and current evaluation unit. The system analyzes the voltage and current data through the basic parameter calibration module to obtain transformer voltage and current calibration evaluation data, then collects temperature data of multiple nodes during the transformer calibration process through the temperature calibration module, and calculates transformer temperature calibration evaluation data. The total number of transformers that meet the factory-set dynamic stability calibration is combined with the dynamic stability calibration module to obtain transformer dynamic stability calibration evaluation data, and finally obtains a comprehensive evaluation module. After collecting various data, the system immediately calculates the quality of the current batch of large current transformers, thereby improving work efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer calibration, in particular to a large current transformer calibration system. Background Art

[0002] Since the large-scale production and exchange of electric energy in the power system involves huge economic interests for various departments, electricity consumption is billed and settled between power plants and power grids, between interconnected lines, and between power grids and large users. The accuracy and reliability of high-voltage electric energy metering devices have become a focus of concern for all parties. Electric energy metering devices consist of high-voltage current and voltage transformers, electric energy meters, and secondary circuits. Current transformers and voltage transformers are electrical equipment responsible for measurement, metering, and protection functions in the power system. Their large number significantly impacts the safe and economic operation of the power grid. However, existing high-current transformer calibration systems are difficult to operate due to the large size and weight of the tested high-current transformers. Testing requires multiple staff members, posing significant safety risks. Staff members are required to actively enter data for calculations, resulting in low test efficiency. This testing method no longer meets testing requirements. Summary of the Invention

[0003] (1) Technical problems solved

[0004] In view of the shortcomings of the existing technology, the present invention provides a large current transformer calibration system, which has the advantages of improving the detection efficiency of the calibration process of large batches of large current transformers, and solves the above technical problems.

[0005] (2) Technical solution

[0006] To achieve the above object, the present invention provides the following technical solution: a large current transformer calibration system, comprising a basic parameter calibration module, a temperature calibration module, a dynamic stability calibration module and a comprehensive evaluation module;

[0007] The basic parameter verification module includes a voltage and current data acquisition unit, a voltage and current data analysis unit and a transformer voltage and current evaluation unit. The voltage and current data acquisition unit is used to collect voltage and current data during the experiment of the transformer. The voltage and current data analysis unit analyzes the voltage and current data collected by the voltage and current data acquisition unit to obtain voltage analysis data and current analysis data. The transformer voltage and current evaluation unit obtains transformer voltage and current verification evaluation data based on the voltage analysis data and current analysis data. The basic parameter verification module sends the calculated transformer voltage and current verification evaluation data to the comprehensive evaluation module.

[0008] The temperature verification module includes a mutual inductor temperature acquisition unit, a temperature analysis unit and a temperature evaluation unit. The mutual inductor temperature acquisition unit is used to collect the temperature of each node of the current mutual inductor during the verification process, and analyze the temperature through the temperature analysis unit. At the same time, the temperature evaluation unit calculates the analysis result of the temperature analysis unit and finally calculates the mutual inductor temperature verification evaluation data. The temperature verification module sends the calculated mutual inductor temperature verification evaluation data to the comprehensive evaluation module;

[0009] The dynamic stability verification module includes a dynamic stability verification data collection unit and a dynamic stability data evaluation unit. The dynamic stability verification data collection unit calculates the dynamic stability verification evaluation data of the transformer based on the total number of transformers that meet the factory-set dynamic stability verification during the dynamic stability verification process, and sends the obtained dynamic stability verification evaluation data of the transformer to the comprehensive evaluation module.

[0010] The comprehensive evaluation module obtains comprehensive evaluation data based on transformer voltage and current verification evaluation data, transformer temperature verification evaluation data, and transformer dynamic stability verification evaluation data.

[0011] As a preferred technical solution of the present invention, the specific expression for the voltage and current data collected by the voltage and current data acquisition unit during the experiment of the transformer is as follows:

[0012]

[0013] Among them, UICJ represents the data set collected by the voltage and current data acquisition unit, U1,…,U n ,…,U N I1,…,I2 represent the maximum voltage during the first transformer calibration process, ..., the maximum voltage during the nth transformer calibration process, ..., the maximum voltage during the Nth transformer calibration process, I1,…,I3 respectively. n ,…,I N They respectively represent the maximum current collected during the first transformer calibration process, ..., the maximum current collected during the nth transformer calibration process, ..., and the maximum current collected during the Nth transformer calibration process.

[0014] As a preferred technical solution of the present invention, the voltage and current data analysis unit analyzes the voltage and current data collected by the voltage and current data acquisition unit to obtain specific expressions of voltage analysis data and current analysis data as follows:

[0015]

[0016] Among them, U0 and I0 represent the rated voltage and current of the transformer, UFX represents the voltage analysis data, IFX represents the current analysis data, and |*| represents the absolute value. Indicates that all N transformers Perform the summation, Indicates that all N transformers Perform the summation.

[0017] As a preferred technical solution of the present invention, the transformer voltage and current evaluation unit obtains the specific expression of the transformer voltage and current verification evaluation data based on the voltage analysis data and the current analysis data as follows:

[0018]

[0019] Among them, UIPJ represents the transformer voltage and current verification evaluation data, UFX represents the voltage analysis data, IFX represents the current analysis data, and e represents the natural constant.

[0020] As a preferred technical solution of the present invention, the specific expression for the temperature of each node of the current transformer during the verification process collected by the transformer temperature acquisition unit is as follows:

[0021]

[0022] Among them, WDCJ represents the temperature data set of each node during the current mutual inductor calibration process, T1 1 ,…,T m 1 ,…,T M 1 They represent the first node temperature during the first transformer calibration process, ..., the mth node temperature during the first transformer calibration process, ..., the Mth node temperature during the first transformer calibration process, T1 n ,…,T m n ,…,T M n They represent the first node temperature during the nth transformer calibration process, ..., the mth node temperature during the nth transformer calibration process, ..., the Mth node temperature during the nth transformer calibration process, T1 N ,…,T m N ,…,T M N They respectively represent the temperature of the 1st node during the Nth transformer calibration process, ..., the temperature of the mth node during the Nth transformer calibration process, ..., and the temperature of the Mth node during the Nth transformer calibration process.

[0023] As a preferred technical solution of the present invention, the specific expression for analyzing the temperature by the temperature analysis unit is as follows:

[0024]

[0025] Among them, WDFX n Indicates the temperature analysis result during the nth transformer calibration process, Indicates the sum of all node temperatures of the nth transformer.

[0026] As a preferred technical solution of the present invention, the temperature evaluation unit calculates the analysis result of the temperature analysis unit and finally calculates the specific expression of the transformer temperature calibration evaluation data as follows:

[0027]

[0028] Among them, WDPJ represents the transformer temperature calibration evaluation data, max{T1 n ,…,T m n ,…,T M n} indicates T1 n ,…,T m n ,…,T M n The largest one, T0 represents the temperature safety threshold, WDFX n Indicates the temperature analysis result during the nth transformer calibration process, and |*| indicates the absolute value.

[0029] As a preferred technical solution of the present invention, the specific expression collected by the dynamic stability verification data collection unit is as follows:

[0030] DWD=[WD1,…,WD n ,…,WD N ]

[0031] Where DWD represents the data set collected by the dynamic stability verification data collection unit, WD1, ..., WD n ,…,WD N They represent the coefficients that meet the factory settings during the first transformer calibration process, ..., the coefficients that meet the factory settings during the nth transformer calibration process, ..., the coefficients that meet the factory settings during the Nth transformer calibration process, and Indicates that the nth transformer meets the factory settings during the calibration process, WD n =0 means that the nth transformer does not meet the factory settings during the calibration process.

[0032] As a preferred technical solution of the present invention, the dynamic stability data evaluation unit calculates the specific expression of the transformer dynamic stability verification evaluation data as follows:

[0033]

[0034] Wherein, f{DWD} represents the sum of all data in the data set DWD collected by the dynamic stability verification data collection unit, N represents the total number of transformers, and WDPJ represents the transformer dynamic stability verification evaluation data.

[0035] As a preferred technical solution of the present invention, the comprehensive evaluation module obtains the specific expression of comprehensive evaluation data based on the transformer voltage and current verification evaluation data, the transformer temperature verification evaluation data and the transformer dynamic stability verification evaluation data as follows:

[0036] ZHPJ=UIPJ+WDPJ+WdPj

[0037] Among them, ZHPJ represents comprehensive evaluation data, WdPJ represents transformer dynamic stability verification evaluation data, UIPJ represents transformer voltage and current verification evaluation data, and WDPJ represents transformer temperature verification evaluation data.

[0038] Compared with the prior art, the present invention provides a large current transformer calibration system with the following beneficial effects:

[0039] The present invention analyzes voltage and current data through a basic parameter verification module to obtain transformer voltage and current verification evaluation data, then collects temperature data of multiple nodes in the transformer verification process through a temperature verification module, and calculates transformer temperature verification evaluation data, and combines the total number of transformers that meet the factory-set dynamic stability verification through a dynamic stability verification module to obtain transformer dynamic stability verification evaluation data, and finally obtains a comprehensive evaluation module, so that the quality of the current batch of large current transformers can be immediately calculated after collecting various data, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Schematic diagram of the system framework of the present invention. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] See also Figure 1, large current transformer calibration system, including basic parameter calibration module, temperature calibration module, dynamic stability calibration module and comprehensive evaluation module;

[0043] The basic parameter verification module includes a voltage and current data acquisition unit, a voltage and current data analysis unit, and a transformer voltage and current evaluation unit. The voltage and current data acquisition unit is used to collect voltage and current data during the experiment of the transformer. The voltage and current data analysis unit analyzes the voltage and current data collected by the voltage and current data acquisition unit to obtain voltage analysis data and current analysis data. The transformer voltage and current evaluation unit obtains transformer voltage and current verification evaluation data based on the voltage analysis data and current analysis data. The basic parameter verification module sends the calculated transformer voltage and current verification evaluation data to the comprehensive evaluation module. The specific expression for the voltage and current data acquisition unit to collect voltage and current data during the experiment of the transformer is as follows:

[0044]

[0045] Among them, UICJ represents the data set collected by the voltage and current data acquisition unit, U1,…,U n ,…,U N I1,…,I2 represent the maximum voltage during the first transformer calibration process, ..., the maximum voltage during the nth transformer calibration process, ..., the maximum voltage during the Nth transformer calibration process, I1,…,I3 respectively. n ,…,I N They represent the maximum currents collected during the first transformer calibration process, ..., the maximum currents collected during the ...th transformer calibration process, ..., and the maximum currents collected during the Nth transformer calibration process, respectively. The voltage and current data analysis unit analyzes the voltage and current data collected by the voltage and current data acquisition unit to obtain specific expressions for voltage analysis data and current analysis data as follows:

[0046]

[0047]

[0048] Among them, U0 and I0 represent the rated voltage and current of the transformer, UFX represents the voltage analysis data, IFX represents the current analysis data, and |*| represents the absolute value. Indicates that all N transformers Perform the summation, Indicates that all N transformers Perform summation. In this embodiment, UFX=0.1, IFX=0.13. The transformer voltage and current evaluation unit obtains the transformer voltage and current verification evaluation data based on the voltage analysis data and the current analysis data. The specific expression is as follows:

[0049]

[0050] Among them, UIPJ represents the transformer voltage and current verification evaluation data, UFX represents the voltage analysis data, IFX represents the current analysis data, and e represents the natural constant. In this embodiment, UIPJ= UFX+IFX =e 0.1+0.13 =1.2586;

[0051] The temperature verification module includes a transformer temperature acquisition unit, a temperature analysis unit, and a temperature evaluation unit. The transformer temperature acquisition unit is used to collect the temperature of each node of the current transformer during the verification process, and analyze the temperature through the temperature analysis unit. At the same time, the temperature evaluation unit calculates the analysis result of the temperature analysis unit and finally calculates the transformer temperature verification evaluation data. The temperature verification module sends the calculated transformer temperature verification evaluation data to the comprehensive evaluation module. The specific expression of the temperature of each node collected by the transformer temperature acquisition unit during the verification process is as follows:

[0052]

[0053] Among them, WDCJ represents the temperature data set of each node during the current mutual inductor calibration process, T1 1 ,…,T m 1 ,…,T M 1 They represent the first node temperature during the first transformer calibration process, ..., the mth node temperature during the first transformer calibration process, ..., the Mth node temperature during the first transformer calibration process, T1 n ,…,T m n ,…,T M n They represent the first node temperature during the nth transformer calibration process, ..., the mth node temperature during the nth transformer calibration process, ..., the Mth node temperature during the nth transformer calibration process, T1 N ,…,T m N ,…,T M NThey represent the temperature of the first node during the N-th transformer calibration process, ..., the temperature of the m-th node during the N-th transformer calibration process, ..., the temperature of the M-th node during the N-th transformer calibration process. The specific expression for analyzing the temperature by the temperature analysis unit is as follows:

[0054]

[0055] Among them, WDFX n Indicates the temperature analysis result during the nth transformer calibration process, Indicates that the temperatures of all nodes of the nth transformer are summed. In this embodiment, the temperature evaluation unit calculates the analysis result of the temperature analysis unit and finally calculates the transformer temperature verification evaluation data. The specific expression is as follows:

[0056]

[0057] Among them, WDPJ represents the transformer temperature calibration evaluation data, max{T1 n ,…,T m n ,…,T M n} indicates T1 n ,…,T m n ,…,T M n The largest one, T0 represents the temperature safety threshold T0 = 85 ° C, WDFX n Indicates the temperature analysis result during the calibration of the nth transformer, |*| indicates the absolute value, WDPJ=0.36;

[0058] The dynamic stability verification module includes a dynamic stability verification data collection unit and a dynamic stability data evaluation unit. The dynamic stability verification data collection unit calculates the total number of transformers that meet the factory-set dynamic stability verification during the dynamic stability verification process, and obtains the transformer dynamic stability verification evaluation data through the dynamic stability data evaluation unit. The obtained transformer dynamic stability verification evaluation data is sent to the comprehensive evaluation module. The specific expression collected by the dynamic stability verification data collection unit is as follows:

[0059] DWD=[WD1,…,WD n ,…,WD N ]

[0060] Where DWD represents the data set collected by the dynamic stability verification data collection unit, WD1, ..., WD n ,…,WD NThey represent the coefficients that meet the factory settings during the first transformer calibration process, ..., the coefficients that meet the factory settings during the nth transformer calibration process, ..., the coefficients that meet the factory settings during the Nth transformer calibration process, and Indicates that the nth transformer meets the factory settings during the calibration process, WD n =0 indicates that the factory settings are not met during the nth transformer calibration process. The dynamic stability data evaluation unit calculates the transformer dynamic stability calibration evaluation data and obtains the specific expression as follows:

[0061]

[0062] Wherein, f{DWD} represents the sum of all data in the data set DWD collected by the dynamic stability verification data collection unit, N represents the total number of transformers, WdPJ represents the transformer dynamic stability verification evaluation data, and WdPJ=0.05;

[0063] The comprehensive evaluation module obtains comprehensive evaluation data based on the transformer voltage and current verification evaluation data, the transformer temperature verification evaluation data, and the transformer dynamic stability verification evaluation data. The specific expression of the comprehensive evaluation data obtained by the comprehensive evaluation module based on the transformer voltage and current verification evaluation data, the transformer temperature verification evaluation data, and the transformer dynamic stability verification evaluation data is as follows:

[0064] ZHPJ=UIPJ+WDPJ+WDPj

[0065] Among them, ZHPJ represents comprehensive evaluation data, WDPJ represents transformer dynamic stability verification evaluation data, UIPJ represents transformer voltage and current verification evaluation data, and WDPJ represents transformer temperature verification evaluation data. In this embodiment, ZHPJ=1.2586+0.36+0.05=1.6686. The smaller the value, the better the quality of the current batch of large current transformers.

[0066] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. High current transformer calibration system, characterized by: Including basic parameter verification module, temperature verification module, dynamic stability verification module and comprehensive evaluation module; The basic parameter verification module includes a voltage and current data acquisition unit, a voltage and current data analysis unit and a transformer voltage and current evaluation unit. The voltage and current data acquisition unit is used to collect voltage and current data during the experiment of the transformer. The voltage and current data analysis unit analyzes the voltage and current data collected by the voltage and current data acquisition unit to obtain voltage analysis data and current analysis data. The transformer voltage and current evaluation unit obtains transformer voltage and current verification evaluation data based on the voltage analysis data and current analysis data. The basic parameter verification module sends the calculated transformer voltage and current verification evaluation data to the comprehensive evaluation module. The temperature verification module includes a mutual inductor temperature acquisition unit, a temperature analysis unit and a temperature evaluation unit. The mutual inductor temperature acquisition unit is used to collect the temperature of each node of the current mutual inductor during the verification process, and analyze the temperature through the temperature analysis unit. At the same time, the temperature evaluation unit calculates the analysis result of the temperature analysis unit and finally calculates the mutual inductor temperature verification evaluation data. The temperature verification module sends the calculated mutual inductor temperature verification evaluation data to the comprehensive evaluation module; The dynamic stability verification module includes a dynamic stability verification data collection unit and a dynamic stability data evaluation unit. The dynamic stability verification data collection unit calculates the dynamic stability verification evaluation data of the transformer based on the total number of transformers that meet the factory-set dynamic stability verification during the dynamic stability verification process, and sends the obtained dynamic stability verification evaluation data of the transformer to the comprehensive evaluation module. The comprehensive evaluation module obtains comprehensive evaluation data based on transformer voltage and current verification evaluation data, transformer temperature verification evaluation data, and transformer dynamic stability verification evaluation data.

2. The large current transformer calibration system according to claim 1, characterized in that: The specific expression for the voltage and current data acquisition unit to acquire the voltage and current data during the experiment of the transformer is as follows: Among them, UICJ represents the data set collected by the voltage and current data acquisition unit, U1,…,U n ,…,U N I1, ..., I2 represent the maximum voltage during the first transformer calibration process, ..., the maximum voltage during the nth transformer calibration process, ..., the maximum voltage during the Nth transformer calibration process, I1, ..., I n ,…,I N They respectively represent the maximum current collected during the first transformer calibration process, ..., the maximum current collected during the nth transformer calibration process, ..., and the maximum current collected during the Nth transformer calibration process.

3. The large current transformer calibration system according to claim 2, characterized in that: The voltage and current data analysis unit analyzes the voltage and current data collected by the voltage and current data collection unit to obtain specific expressions of voltage analysis data and current analysis data as follows: Among them, U0 and I0 represent the rated voltage and current of the transformer, UFX represents the voltage analysis data, IFX represents the current analysis data, and |*| represents the absolute value. Indicates that all N transformers Perform the summation, Indicates that all N transformers Perform the summation.

4. The large current transformer calibration system according to claim 3, characterized in that: The transformer voltage and current evaluation unit obtains the transformer voltage and current verification evaluation data based on the voltage analysis data and the current analysis data. The specific expression is as follows: Among them, UIPJ represents the transformer voltage and current verification evaluation data, UFX represents the voltage analysis data, IFX represents the current analysis data, and e represents the natural constant.

5. The large current transformer calibration system according to claim 4, characterized in that: The specific expression for the transformer temperature acquisition unit to collect the temperature of each node during the current transformer calibration process is as follows: Among them, WDCJ represents the temperature data set of each node during the current mutual inductor calibration process, T1 1 ,…,T m 1 ,…,T M 1 They represent the first node temperature during the first transformer calibration process, ..., the mth node temperature during the first transformer calibration process, ..., the Mth node temperature during the first transformer calibration process, T1 n ,…,T m n ,…,T M n They represent the first node temperature during the nth transformer calibration process, ..., the mth node temperature during the nth transformer calibration process, ..., the Mth node temperature during the nth transformer calibration process, T1 N ,…,T m N ,…,T M N They respectively represent the temperature of the 1st node during the Nth transformer calibration process, ..., the temperature of the mth node during the Nth transformer calibration process, ..., and the temperature of the Mth node during the Nth transformer calibration process.

6. The large current transformer calibration system according to claim 5, characterized in that: The specific expression for analyzing the temperature by the temperature analysis unit is as follows: Among them, WDFX n Indicates the temperature analysis result during the nth transformer calibration process, Indicates the sum of all node temperatures of the nth transformer.

7. The large current transformer calibration system according to claim 6, characterized in that: The temperature evaluation unit calculates the analysis result of the temperature analysis unit and finally calculates the specific expression of the transformer temperature calibration evaluation data as follows: Among them, WDPJ represents the transformer temperature calibration evaluation data, max{T1 n ,…,T m n ,…,T M n } indicates T1 n ,…,T m n ,…,T M n The largest one, T0 represents the temperature safety threshold, WDFX n Indicates the temperature analysis result during the nth transformer calibration process, and |*| indicates the absolute value.

8. The large current transformer calibration system according to claim 7, characterized in that: The specific expression collected by the dynamic stability verification data collection unit is as follows: DWD=[WD1,…,WD n ,…,WD N ] Where DWD represents the data set collected by the dynamic stability verification data collection unit, WD1, ..., WD n ,…,WD N They represent the coefficients that meet the factory settings during the first transformer calibration process, ..., the coefficients that meet the factory settings during the nth transformer calibration process, ..., the coefficients that meet the factory settings during the Nth transformer calibration process, and WD n =1 means that the nth transformer meets the factory settings during the calibration process, WD n =0 means that the nth transformer does not meet the factory settings during the calibration process.

9. The large current transformer calibration system according to claim 8, characterized in that: The dynamic stability data evaluation unit calculates the specific expression of the transformer dynamic stability verification evaluation data as follows: Wherein, f{DWD} represents the sum of all data in the data set DWD collected by the dynamic stability verification data collection unit, N represents the total number of transformers, and WDPJ represents the transformer dynamic stability verification evaluation data.

10. The large current transformer calibration system according to claim 9, characterized in that: The comprehensive evaluation module obtains the specific expression of comprehensive evaluation data based on the transformer voltage and current verification evaluation data, the transformer temperature verification evaluation data, and the transformer dynamic stability verification evaluation data as follows: ZHPJ=UIPJ+WDPJ+WdPJ Among them, ZHPJ represents comprehensive evaluation data, WdPJ represents transformer dynamic stability verification evaluation data, UIPJ represents transformer voltage and current verification evaluation data, and WDPJ represents transformer temperature verification evaluation data.

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