Integrated intelligent verification system and method for secondary circuit of mutual inductor

Abstract

The invention relates to a mutual inductor secondary circuit integrated intelligent verification system and a method thereof, and belongs to the technical field of power system relay protection and measurement. Comprising a portable host, a multifunctional test terminal adapter and an intelligent analysis management platform. The method is efficient, safe and convenient to test; detection is comprehensive, and diagnosis is intelligent; data management facilitates operation and maintenance.

Description

Technical Field

[0001] This invention relates to an integrated intelligent verification system and method for the secondary circuit of a current transformer, belonging to the field of power system relay protection and measurement technology. Background Technology

[0002] In power systems, the correctness and integrity of the secondary circuits of current transformers and voltage transformers are fundamental to ensuring the reliable operation of relay protection devices and the accurate measurement of measuring instruments. Traditional secondary circuit verification relies heavily on manual labor, which has the following main drawbacks: Inefficient and high safety risks: Calibration personnel need to carry a variety of instruments (such as current booster and voltage booster, standard meters, multimeters, etc.) and travel back and forth between multiple points such as protection panels, terminal boxes, and transformer bodies to connect wires, test and record data. The workload is large and time-consuming, and there are safety hazards in working in the operating substation.

[0003] Incomplete verification items can easily lead to missed detections: Manual verification usually focuses on basic items such as circuit continuity and DC resistance. It is difficult to conduct a comprehensive and systematic inspection of hidden defects such as circuit load matching, multi-point grounding, parasitic circuits, and insulation coordination, which can easily leave hidden dangers.

[0004] Reliance on personal experience and inconsistent standards: The judgment of test results largely depends on the experience of the verification personnel, lacking unified and objective intelligent criteria, which can easily lead to misjudgment or omission.

[0005] Data management is fragmented: test data is mostly recorded manually, making it difficult to create electronic archives and hindering historical tracing, trend analysis, and lifecycle management. Summary of the Invention

[0006] Based on the problems described in the background, the problem that this invention aims to solve is: In the existing technology, some secondary circuit testing devices have emerged, but their functions are often relatively simple, or they only realize the automation of some test items. They lack a comprehensive solution for one-stop intelligent diagnosis and evaluation of the secondary circuit's "wiring correctness, circuit integrity, parameter matching, and insulation reliability".

[0007] To achieve the above objectives, the present invention provides the following technical solution: An integrated intelligent verification system for the secondary circuit of a current transformer, characterized in that it comprises: Portable host: integrates a programmable signal source, a high-precision data acquisition module, and a central processing unit; Multifunctional test terminal adapter: It integrates a multi-channel switching matrix to connect the host to the terminal block of the circuit under test and realizes automatic switching of test wiring; Intelligent analysis and management platform: running on the central processing unit, including a test process controller, a loop analysis and diagnostic engine, and an automatic report generator.

[0008] Preferably, the loop analysis and diagnosis engine has a built-in secondary loop model library, standard specification library, and fault feature library, which are used to perform horizontal comparison, vertical comparison, specification compliance check, and correlation analysis on multiple test data.

[0009] Preferably, the method includes the following steps: S1: Configure the parameters of the circuit under test and construct a virtual reference model; S2: The circuit under test is connected through the multi-functional test terminal adapter, and the test process controller automatically executes multiple tests in sequence, including circuit continuity, insulation, polarity, and load characteristics. S3: The loop analysis and diagnostic engine comprehensively analyzes all test data and provides diagnostic conclusions and defect location; S4: The report generator outputs a structured verification report and archives the test data.

[0010] Preferably, in step S2, the multi-item test is automatically completed by the host through controlling the action of the multi-channel switching matrix, switching between signal injection points and measurement points between different test items, without the need for manual rewiring.

[0011] Preferably, the comprehensive analysis in step S3 includes: comparing data from different phases of the same circuit horizontally, comparing measured data with theoretical values ​​from the virtual model vertically, checking the conformity of measured data with standard limits, and performing correlation reasoning based on multiple test results to diagnose complex defects.

[0012] The beneficial effects of this invention are: High efficiency and safety, one-click testing: Automatic wiring switching is achieved through a multi-functional test terminal adapter, which integrates complex multi-item tests into one process and completes them automatically, greatly improving the verification efficiency and reducing the operation time and safety risks of personnel in front of the power supply cabinet.

[0013] Comprehensive testing and intelligent diagnosis: The system integrates a full range of test items, from basic continuity to complex loads, grounding, and insulation. Through the built-in intelligent diagnostic engine, it performs multi-dimensional correlation analysis, which can discover hidden defects that are difficult to detect by manual verification, greatly improving the depth and reliability of verification.

[0014] Standardization and objectivity: The entire testing process and judgment criteria are controlled by the system program, avoiding errors caused by human factors and inconsistent standard implementation, thus ensuring the objectivity and authority of the verification results.

[0015] Data-driven management facilitates operation and maintenance: Automatically generated electronic reports and archived data establish a complete "health record" for secondary circuits, facilitating condition assessment, fault tracing, and preventive maintenance decisions, and strongly supporting the operation and maintenance management of smart substations. Detailed Implementation

[0016] Example 1: The calibration personnel connect the plug of the multi-functional test terminal adapter to the test terminal of the current loop terminal block of the protection panel.

[0017] On the touchscreen of the portable host, through the intelligent analysis and management platform interface, select the "Line Protection CT Secondary Circuit Verification" template and enter parameters such as the circuit number, CT ratio, and winding purpose.

[0018] Click "Start Verification". The system will automatically perform the following steps: First, control the switching matrix to perform continuity and DC resistance tests on each phase A, B, C, and N circuit. The screen displays the resistance value and "pass / alarm" status in real time.

[0019] Next, the insulation resistance tests between the windings and ground and between windings are performed automatically.

[0020] Then, a polarity check is performed by automatically injecting instantaneous current to determine if the polarity is correct.

[0021] Finally, a load characteristic test is performed, and the system outputs a set of gradient currents, automatically plotting and analyzing the loop current-voltage characteristic curve.

[0022] During the test, the loop analysis and diagnostic engine analyzes the data in real time. For example, if it is found that the DC resistance of phase A is 50% higher than that of other phases, and the phase exhibits slight nonlinearity during the load test, the engine will make a comprehensive judgment that "the phase A loop has a defect of excessive contact resistance, and it is recommended to check the terminal fastening".

[0023] Once all projects are completed, the system automatically generates a report summarizing all data, listing "Defect Found: Abnormal Contact Resistance in Phase A," and providing handling suggestions. Verification personnel can print the report on-site and upload the data to the station management system for archiving.

[0024] As can be seen from this embodiment, the present invention simplifies the complex verification work that originally required several hours and multiple people to a one-click operation by a single person in a short time, and can provide more comprehensive and intelligent diagnostic conclusions.

Claims

1. An integrated intelligent calibration system for a transformer secondary circuit, characterized in that, The application relates to a portable host computer, a multifunctional test terminal adapter and an intelligent analysis management platform. The portable host computer comprises a programmable signal source, a high-precision data acquisition module and a central processing unit. The multifunctional test terminal adapter is internally integrated with a multi-path switching matrix, which is used for connecting the host computer with a terminal row of a measured circuit and realizing automatic switching of test wiring. The intelligent analysis management platform is run on the central processing unit and comprises a test flow controller, a circuit analysis and diagnosis engine and a report automatic generator.

2. The system of claim 1, wherein, The circuit analysis and diagnosis engine is internally integrated with a secondary circuit model library, a standard specification library and a fault feature library, which are used for horizontally comparing, vertically comparing, checking specification compliance and correlatively analyzing a plurality of test data.

3. A method for integrated intelligent calibration of a transformer secondary circuit, characterized in that, The application further relates to a test method, which comprises the following steps: S1: configuring parameters of a measured circuit to build a virtual reference model; S2: connecting the measured circuit through the multifunctional test terminal adapter, and automatically and sequentially executing a plurality of item tests including circuit conduction, insulation, polarity and load characteristics by the test flow controller; S3: comprehensively analyzing all test data by the circuit analysis and diagnosis engine to give a diagnosis conclusion and defect positioning; S4: outputting a structured check report by the report automatic generator and archiving test data.

4. The method of claim 3, wherein, In the S2 step, the plurality of item tests are automatically completed by the host computer through controlling the action of the multi-path switching matrix to switch signal injection points and measurement points among different test items without manual reconnection.

5. The method of claim 3, wherein, In the S3 step, the comprehensive analysis comprises horizontally comparing data of different phases of the same circuit, vertically comparing measured data with theoretical values of the virtual model, checking the measured data with standard limits, and correlatively reasoning a plurality of test results to diagnose complex defects.