CN-122017397-A - Multi-class feeder terminal unit FTU self-adaptive testing device and method

CN122017397ACN 122017397 ACN122017397 ACN 122017397ACN-122017397-A

Abstract

The invention discloses a multi-class Feeder Terminal Unit (FTU) self-adaptive testing device and method, and aims to solve the problems that the existing FTU testing device is poor in adaptability and needs much manual intervention. The device comprises a mechanical support, an electrical connection, a self-adaptive test core, a data acquisition and processing module, a power supply module and an adaptive adjustment module. The self-adaptive test core comprises a model identification unit, a programmable test control unit and an excitation signal generation unit, wherein the model identification unit, the programmable test control unit and the excitation signal generation unit are used for realizing automatic identification of the FTU model through interface reading and image identification, and the programmable test control unit is used for calling a preset parameter library to drive the excitation signal generation unit to generate various analog signals. The electric connection module realizes the accurate butt joint of the FTU and each module through the self-adaptive interface matrix. The device can be automatically adapted to multiple FTUs without manual intervention, so that the testing accuracy and efficiency are improved, and the device is suitable for FTU batch detection scenes.

Inventors

ZHAO YING
TAN ZHENQI
LI LIANG
SHAN YUZHU
Liao Bangjian
SUN PEISHENG
LIU YUPENG
ZHOU XIAOXIAN
HE PENG

Assignees

国网重庆市电力公司长寿供电分公司

Dates

Publication Date: 20260512
Application Date: 20260108

Claims (10)

1. The self-adaptive testing device for the multi-class Feeder Terminal Unit (FTU) is characterized by comprising a mechanical supporting module, an electric connecting module, a self-adaptive testing core module, a data acquisition and processing module, a power supply module and an adaptive adjusting module; the mechanical support module comprises: The adjustable mounting platform adopts a modularized sliding rail design, an anti-skid clamp capable of being replaced quickly is arranged on the surface of the platform, and the clamp is driven pneumatically to automatically clamp and loosen the FTU; the self-adaptive test core module is respectively connected with the electric connection module, the data acquisition and processing module and the adaptation adjustment module in a bidirectional signal manner and is used for outputting model identification signals and test control signals to the corresponding modules and receiving status signals fed back by the modules; the self-adaptive test core module comprises an FTU model identification unit, a programmable test control unit and an excitation signal generation unit, wherein the FTU model identification unit comprises an interface reading assembly and an image identification module, and the interface reading assembly is in signal connection with a self-adaptive interface matrix unit of the electric connection module and is used for reading model identification information built in the FTU and transmitting the model identification information to the programmable test control unit; The image recognition module is in signal connection with the programmable test control unit and is used for shooting the FTU appearance mark and transmitting an image signal to the programmable test control unit; The programmable test control unit is internally provided with an industrial embedded processor and a real-time operating system, and is respectively connected with the FTU model identification unit, the excitation signal generation unit, the adaptation adjustment module and the data acquisition and processing module in a signal way, and is used for receiving model information transmitted by the FTU model identification unit, calling a preset test parameter library, outputting a test control signal to the excitation signal generation unit and the adaptation adjustment module, and simultaneously receiving test data transmitted by the data acquisition and processing module and comparing and analyzing the test data; The adaptive adjusting module is connected with the mechanical supporting module through driving signals and is used for driving the mechanical supporting module to complete position adjustment according to the adjusting signals output by the adaptive test core module, and the adaptive adjusting module comprises: The mechanical adjustment driving unit is linked with the adjustable mounting platform of the mechanical support module, drives the clamp to move through the servo motor, and realizes automatic adjustment of the mounting platform; The protocol adapting unit is internally provided with a plurality of standard communication protocol libraries and a custom protocol editing function and automatically matches corresponding communication protocol analysis modes according to the characteristics of communication protocols of FTUs of different manufacturers; the electrical connection module comprises an adaptive interface matrix unit and a signal conditioning unit, wherein a programmable logic controller and a contact detection sensor are arranged in the adaptive interface matrix unit, the programmable logic controller is in signal connection with the adaptive test core module, the contact detection sensor is in signal connection with the adaptive test core module and is used for collecting connection state signals of the FTU and an interface and feeding back the connection state signals to the adaptive test core module, one end of the signal conditioning unit is in signal connection with the adaptive interface matrix unit, and the other end of the signal conditioning unit is in signal connection with the adaptive test core module and the data acquisition and processing module; The power supply module is respectively in power supply connection with the mechanical support module, the electric connection module, the self-adaptive test core module, the data acquisition and processing module and the adaptive adjustment module and is used for outputting power supply signals for adapting the work of each module.
2. The multi-class feeder terminal unit FTU self-adaptive testing device according to claim 1, wherein the programmable testing control unit is respectively connected with the excitation signal generating unit, the adaptive adjusting module and the data acquisition and processing module through a Modbus or a Profinet bus to realize cooperative control signals, the analog grid voltage signal range generated by the excitation signal generating unit is 0-10kV, the analog grid current signal range is 0-500A, the signal precision is +/-0.2%, the generated switching value excitation signal is DC 24V or AC 220V, and the generated communication protocol excitation signal supports IEC 60870-5-101/104 and DL/T645 standard protocols.
3. The adaptive testing device for the multi-class feeder terminal unit FTU according to claim 1, wherein the data acquisition and processing module comprises a high-precision data acquisition unit, a data processing and analysis unit and a data storage and interaction unit, wherein the high-precision data acquisition unit is in signal connection with a signal conditioning unit of the electrical connection module and is used for receiving processed FTU response signals, acquiring voltage, current, switching value state and communication message data output by the FTU and transmitting the voltage, current, switching value state and communication message data to the data processing and analysis unit, the high-precision data acquisition unit is internally provided with a calibration module and is in signal connection with the programmable test control unit and is used for receiving calibration control signals output by the programmable test control unit and automatically completing acquisition precision calibration, the data processing and analysis unit is in a FPGA+DSP architecture and is used for receiving test data transmitted by the high-precision data acquisition unit and completing data filtering, signal amplitude and phase calculation, communication message and test parameter comparison and then transmitting test result signals to the programmable test control unit, and the data storage and interaction unit is connected with the data processing and analysis unit and the data processing and processing unit and the data processing and the communication message and the test parameter comparison are used for achieving an interface of a test interface, an HDMI or an interface.
4. The self-adaptive testing device of the multi-class feeder terminal unit FTU according to claim 1, wherein the power supply module comprises an input power supply unit and a self-adaptive power supply output unit, the input power supply unit is connected with an external power grid, a power supply filter and a surge protector are arranged in the input power supply unit and used for filtering and surge suppressing input power grid voltage and then transmitting the input power grid voltage to the self-adaptive power supply output unit, the self-adaptive power supply output unit is connected with the input power supply unit through a DC-DC conversion module and is in signal connection with the programmable test control unit and used for receiving power supply parameter signals output by the programmable test control unit, generating DC 12V, 24V and 48V direct current output voltages and transmitting the DC 12V, 24V and 48V direct current output voltages to the modules.
5. The device for adaptively testing the multi-class feeder terminal unit FTU according to claim 1, wherein the adaptation adjustment module further comprises a protocol adaptation unit, the protocol adaptation unit is in signal connection with the programmable test control unit, is internally provided with a plurality of standard communication protocol libraries and custom protocol editing functions, is used for receiving FTU model signals output by the programmable test control unit, automatically matches corresponding communication protocol analysis modes, adjusts protocol parameters such as baud rate, data bits, stop bits, check bits and the like, and ensures normal communication with the FTU.
6. The self-adaptive testing method of the multi-class Feeder Terminal Unit (FTU) is characterized by being realized based on a testing device comprising a mechanical supporting module, an electrical connecting module, a self-adaptive testing core module, a data acquisition and processing module, a power supply module and an adaptive adjusting module, and comprises the following steps: S1, test initialization and FTU feeding positioning The method comprises the steps of starting a power supply module to supply power for each module to finish self-inspection of each module, initializing a programmable test control unit of a self-adaptive test core module, loading a preset test parameter library and a communication protocol library, placing an FTU to be tested on an adjustable mounting platform, and realizing preliminary positioning and clamping through a pneumatic driving clamp; S2, FTU type self-adaptive identification The method comprises the steps of reading the built-in model identification information of the FTU through an interface reading assembly, checking read data through a checking algorithm, shooting the appearance identification of the FTU through an image recognition module, extracting features through a feature matching algorithm and matching the features with a preset feature library; s3, mechanical and protocol adaptation adjustment According to the FTU manufacturer information, matching a corresponding communication protocol, generating a proprietary analysis module by a self-defined protocol editing function through a nonstandard protocol, and verifying the protocol matching degree; S4, test parameter configuration and excitation signal generation Generating analog power grid voltage/current signals, switching value excitation signals and communication protocol excitation signals by adopting a direct digital synthesis technology, and transmitting the signals to an electric connection module after signal conditioning; s5, test execution and data acquisition The method comprises the steps of injecting conditioned excitation signals into an FTU to be tested, triggering the FTU to enter a test response state, collecting power grid signal response data, switching value action response data and communication response data of the FTU in real time, and preprocessing collected original data by adopting a filtering algorithm; s6, test data processing and result analysis Comparing the preprocessed test data with a standard threshold value, and calculating the relative deviation between the actual test data and the standard data; s7, test ending and report generation Stopping generating an excitation signal, powering off the FTU, loosening the mechanical clamp, resetting the mounting platform, resetting the interface array, automatically generating a standardized test report according to test data and analysis results, storing and uploading the standardized test report, recording abnormal information and triggering an alarm when an abnormality occurs in the test process, and outputting a processing suggestion.
7. The adaptive testing method of multi-class feeder terminal unit FTU according to claim 6, wherein the checking algorithm in S2 is a CRC-16 checking algorithm, and the expression is: , the data is an i-th model identification data byte, n is the length of the data byte, polynomial is a CRC-16 standard polynomial, and < is an exclusive OR operation symbol, wherein the check passing condition is that the calculated CRC value is consistent with the built-in check code of the FTU, and the auxiliary verification of image identification is triggered after repeated reading for 3 times when the check fails; the feature matching algorithm in S2 is a SIFT feature matching algorithm, and the matching degree calculation function is as follows: , M is the feature matching degree, S is the ith feature point set of the image to be identified, T is the ith feature point set of the standard model, M is the total number of feature points, n is an intersection operation symbol, U is a union operation symbol, and when M is more than or equal to 0.8, the matching is judged to be successful, and when M is less than or equal to 0.8, a model identification failure signal is output.
8. The multi-class feeder terminal unit FTU adaptive test method of claim 6 wherein the protocol matching verification function in S3 is: , And judging that the protocol is successfully matched when the P is more than or equal to 95%, otherwise, adjusting parameters to be matched again.
9. The method for adaptive testing of multi-class feeder terminal units FTU according to claim 6, wherein, The generation formula of the analog grid voltage/current signal in S4 is as follows: , , Wherein U (t) is an analog voltage signal at time t, I (t) is an analog current signal at time t, U is a voltage peak, I is a current peak, f is a signal frequency, t is a time variable, As an initial phase, θ is a phase difference between voltage and current; The switching value excitation signal is a periodic pulse signal, and the expression is as follows: , parameter definition: The amplitude of the switching value excitation signal at the moment t; The high level amplitude is called according to the FTU model parameter; the low level amplitude is called according to the FTU model parameter; pulse period sequence number; pulse period; Pulse width; the communication protocol excitation signal is generated in units of frames, and the timing expression of the single-frame signal is as follows: , parameter definition: Communication protocol excitation signals at the time t; the total bit number of a single frame signal; The data of the kth bit is used for processing the data, 0 Corresponds to a low level, and 1 corresponds to a high level; communication signal amplitude; A rectangular window function is used to determine the window, When (when) Otherwise ; The frame starting time is shown; the period of the bit is set to be equal to the period of the bit, B is the baud rate.
10. The method for adaptive testing of multi-class feeder terminal units FTU according to claim 6, wherein, The filtering algorithm in S5 is a Kalman filtering algorithm, and the formula is as follows: , , Wherein, the For the filtered data at time k, a is the state transition matrix, The method comprises the steps that data after filtering at the moment K-1 is obtained, B is a control matrix, u is K moment control input, K is K moment Kalman gain, z is K moment original acquired data, P is K-1 moment covariance matrix, A is transpose matrix of A, Q is process noise variance, and data acquisition frequency is set to be 1kHz; The relative deviation calculation function in S6 is: , Wherein, delta is relative deviation, X is actual test data, X is standard data, and the judgment standard is that the test item is qualified when delta is less than or equal to 5 percent, suspected unqualified when delta is less than or equal to 10 percent, and unqualified when delta is more than 10 percent; The scoring formula of the weighted scoring method in S6 is as follows: , Wherein S is the composite score, w is the j-th test item weight, S is the j-th test item score, and n is the total number of test items.

Description

Multi-class feeder terminal unit FTU self-adaptive testing device and method Technical Field The invention relates to the technical field of power system distribution automation equipment testing, in particular to a multi-class Feeder Terminal Unit (FTU) self-adaptive testing device and method. Background In a 10KV power distribution system, a Feeder Terminal Unit (FTU) is core equipment for realizing monitoring, control and protection of a power distribution line, and the performance stability of the FTU directly influences the safe and reliable operation of the power distribution system. The main current switch and the matched FTU in the current 10KV power distribution system can be divided into four types of electromagnetic spring operation type, electronic magnetic control type and electromagnetic magnetic control type according to the sampling mode and the action characteristic, and the operating voltage class covers a plurality of classes such as 24V, 48V and 380V. The existing FTU testing devices are designed in a targeted manner, namely each type of FTU or each operating voltage level corresponds to a set of proprietary testing device. According to statistics, 6 different test devices are required to be equipped for the main stream FTU type and voltage class. In actual test work, no matter in-warehouse batch test or on-site inspection test, all 6 sets of devices are needed to be carried by staff, so that the problems of inconvenient carrying and high storage cost exist, and a great amount of test time is wasted due to frequent replacement of the test devices. More importantly, the device is easy to have a type selection error in the replacement process, so that the test abnormality is caused, the accuracy of a test result is influenced, and a plurality of obstacles are brought to the FTU test work. In addition, the existing FTU testing device can only realize independent testing of a single FTU, cannot simulate the cascading operation state of a switch in an actual circuit, causes deviation between a testing scene and the actual operation scene, cannot comprehensively verify the performance of the FTU under the cascading working condition, and is difficult to meet the requirement of circuit simulation testing. In summary, the existing FTU testing device has the defects of poor compatibility, inconvenient carrying and use, low testing efficiency, easy replacement error, incapability of simulating cascade working conditions and the like, and a technical scheme capable of solving the problems is needed to be provided. Disclosure of Invention The self-adaptive testing device and the self-adaptive testing method for the FTUs of the multi-class feeder terminal units are provided, the testing requirements of the single-set device for adapting to different types, different operating voltage levels and different communication protocols of the FTUs are met, the traditional multi-set special testing device is replaced, the testing process is simplified, and the carrying and storage cost of testing equipment is reduced. The model identification unit is used for automatically identifying the model of the FTU, the automatic accurate butt joint of the FTU and the test interface is realized by means of the adaptation adjustment module and the mechanical support module, and the protocol analysis mode is automatically matched with the protocol adaptation unit, so that the manual intervention is reduced, and the risk of misoperation is reduced. The technical scheme which is convenient, efficient and reliable is provided for the FTU test, and the smooth development of the FTU test work of the 10KV power distribution system is ensured. The technical scheme of the invention is as follows: The self-adaptive testing device for the multi-class Feeder Terminal Unit (FTU) comprises a mechanical supporting module, an electrical connecting module, a self-adaptive testing core module, a data acquisition and processing module, a power supply module and an adaptive adjusting module; the mechanical support module comprises: The adjustable mounting platform adopts a modularized sliding rail design, an anti-skid clamp capable of being replaced quickly is arranged on the surface of the platform, and the clamp is driven pneumatically to automatically clamp and loosen the FTU; the self-adaptive test core module is respectively connected with the electric connection module, the data acquisition and processing module and the adaptation adjustment module in a bidirectional signal manner and is used for outputting model identification signals and test control signals to the corresponding modules and receiving status signals fed back by the modules; the self-adaptive test core module comprises an FTU model identification unit, a programmable test control unit and an excitation signal generation unit, wherein the FTU model identification unit comprises an interface reading assembly and an image identification module, and the interface reading