Large-current transformer verification system

Abstract

The invention relates to the technical field of mutual inductor verification, and discloses a large-current mutual inductor verification system which comprises a basic parameter verification module, a temperature verification module, a dynamic stability verification module and a comprehensive evaluation module. The basic parameter verification module comprises a voltage and current data acquisition unit, a voltage and current data analysis unit and a mutual inductor voltage and current evaluation unit. The system analyzes voltage and current data through the basic parameter verification module to obtain transformer voltage and current verification evaluation data, then collects temperature data of a plurality of nodes in the transformer verification process through the temperature verification module, and calculates to obtain transformer temperature verification evaluation data. And the total number of the transformers which meet factory settings and are subjected to dynamic stability verification by the dynamic stability verification module is combined to obtain the dynamic stability verification evaluation data of the transformers, and finally the comprehensive evaluation module is obtained, so that the quality condition of the current batch of large-current transformers is calculated immediately after various data are collected, and the working efficiency is improved.

Description

Technical Field

[0001] The 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 of various departments, the electricity consumption between power plants and power grids, between interconnected lines, and between power grids and large users must be billed and settled according to the amount of electricity. The accuracy and reliability of high-voltage electric energy metering devices have also become a focus of concern for all parties. The electric energy metering device consists of high-voltage current and voltage transformers, electric energy meters, and secondary circuits. Among them, current transformers and voltage transformers are power equipment in the power system that are responsible for measurement, metering, protection, and other functions. There are many of them, which have a great impact on the safe and economic operation of the power grid. However, the existing large current transformer calibration system is difficult to operate due to the large and bulky size of the large current transformer under test. During the test, several staff members are required to handle it, which poses a great safety hazard. Staff members are required to actively enter data for calculation, which leads to low test efficiency. This detection method can no longer meet the detection requirements. Summary of the invention

[0003] 1. Technical issues to be solved

[0004] In view of the deficiencies in the prior art, the present invention provides a large current transformer calibration system, which has the advantages of improving the detection efficiency of a large batch of large current transformer calibration processes, and solves the above-mentioned technical problems.

[0005] (II) Technical solution

[0006] To achieve the above object, the present invention provides the following technical solutions: 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 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;

[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 is based on the total number of transformers that meet the factory-set dynamic stability verification during the dynamic stability verification of the transformers, and calculates the transformer dynamic stability verification evaluation data through the dynamic stability data evaluation unit, and sends the obtained transformer dynamic stability verification evaluation data to the comprehensive evaluation module;

[0010] 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.

[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 respectively 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 represent the maximum voltage during the first transformer calibration process,…,I4,…,I5 respectively represent the maximum voltage during the first transformer calibration process,…,I6,…,I7,…,I8,…,I9,…,I10 respectively represent the maximum voltage during the first transformer calibration process,…,I11,…,I12 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, ..., 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 collection 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 for all N transformers To sum, Indicates that for 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 collection unit is as follows:

[0021]

[0022] Among them, WDCJ represents the temperature data set of each node during the current transformer verification 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 1st 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.

[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. It means to sum the temperatures of all nodes 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 verification evaluation data as follows:

[0027]

[0028] Where 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 It indicates the temperature analysis result during the calibration of the nth transformer, 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 respectively 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 verification process, WD n =0 means that the factory settings are not met during the nth transformer 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, which has the following beneficial effects:

[0039] The present invention analyzes the voltage and current data through a basic parameter verification module to obtain transformer voltage and current verification evaluation data, then collects the temperature data of multiple nodes in the transformer verification process through a temperature verification module, and calculates the transformer temperature verification evaluation data, and combines the total number of transformers that meet the factory-set dynamic stability verification by the dynamic stability verification module to obtain the 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 calculated immediately after the data are collected, 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work 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 of the voltage and current data acquisition unit collecting 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 respectively 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 represent the maximum voltage during the first transformer calibration process,…,I4,…,I5 respectively represent the maximum voltage during the first transformer calibration process,…,I6,…,I7,…,I8,…,I9,…,I10 respectively represent the maximum voltage during the first transformer calibration process,…,I11,…,I12 n ,…,I N They respectively represent the maximum currents collected during the first transformer calibration process, ..., the maximum currents collected during the ...th transformer calibration process, ..., the maximum currents collected during the Nth transformer calibration process. 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:

[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 for all N transformers To sum, Indicates that for all N transformers The sum is calculated. 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 transformer temperature acquisition unit collects the specific expression of the temperature of each node during the current transformer verification process as follows:

[0052]

[0053] Among them, WDCJ represents the temperature data set of each node during the current transformer verification 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 respectively represent the temperature of the first node during the Nth transformer calibration process, ..., the temperature of the mth node during the Nth transformer calibration process, ..., the temperature of the Mth node during the Nth 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. It represents the sum of the temperatures of all nodes of the nth transformer. In this embodiment, the temperature evaluation unit calculates the analysis result of the temperature analysis unit and finally calculates the specific expression of the transformer temperature verification evaluation data as follows:

[0056]

[0057] Where 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 among them, T0 represents the temperature safety threshold T0 = 85°C, WDFX n It represents the temperature analysis result during the calibration of the nth transformer, |*| represents 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 is based on the total number of transformers that meet the factory-set dynamic stability verification during the dynamic stability verification process, and calculates the transformer dynamic stability verification evaluation data through the dynamic stability data evaluation unit, and sends the obtained transformer dynamic stability verification evaluation data 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 respectively 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 verification process, WD n =0 means that the factory settings are not met during the nth transformer verification process. The dynamic stability data evaluation unit calculates the specific expression of the transformer dynamic stability verification evaluation data 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, 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] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. High current transformer calibration system, characterized by: It includes 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 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 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 is based on the total number of transformers that meet the factory-set dynamic stability verification during the dynamic stability verification of the transformers, and calculates the transformer dynamic stability verification evaluation data through the dynamic stability data evaluation unit, and sends the obtained transformer dynamic stability verification evaluation data to the comprehensive evaluation module; 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.

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 respectively 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 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, ..., 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 for all N transformers To sum, Indicates that for all N transformers Perform the summation.

4. The large current transformer calibration system according to claim 3 is characterized in that: The specific expression of the transformer voltage and current evaluation data obtained by the transformer voltage and current evaluation unit based on the voltage analysis data and the current analysis data 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 verification process is as follows: Among them, WDCJ represents the temperature data set of each node during the current transformer verification 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 1st 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.

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. It means to sum the temperatures of all nodes 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 verification evaluation data as follows: Where 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 It indicates the temperature analysis result during the calibration of the nth transformer, 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 respectively 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 indicates that the nth transformer meets the factory settings during the verification process, WD n =0 means that the factory settings are not met during the nth transformer calibration process.

9. The large current transformer calibration system according to claim 8, characterized in that: The specific expression of the transformer dynamic stability verification evaluation data calculated by the dynamic stability data evaluation unit is 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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