CN115356674A

CN115356674A - Intelligent testing method for mutual inductor

Info

Publication number: CN115356674A
Application number: CN202211074968.XA
Authority: CN
Inventors: 李涛昌; 宋仁丰; 王家晨; 冷传福; 高庆利; 邓叶; 李国念; 管永秋; 卫伟; 柳鑫; 邵富家; 朱松; 王作超; 刘家富
Original assignee: Dalian North Instrument Transformer Group Co Ltd
Current assignee: Dalian North Instrument Transformer Group Co Ltd
Priority date: 2022-09-02
Filing date: 2022-09-02
Publication date: 2022-11-18

Abstract

An intelligent test method for a mutual inductor belongs to the technical field of mutual inductors, and comprises the following specific test operation processes: in the assembly line operation, the assembled finished mutual inductor is transferred to a special tray, and the electric vehicle is adopted to transport to the head end of the test line, and the following steps are carried out in sequence: s1, carrying out a pressure resistance test; s2, detecting partial discharge; s3, pressing the forward button to the next station, and performing a direct current resistance measurement test; s4, performing an insulation resistance measurement test; s5, pressing a forward button to a next station, and performing polarity and accuracy inspection tests; s6, excitation characteristic detection test; the to-be-achieved bill and the certificate are printed and tied on a mutual inductor, and an electric vehicle is adopted to transport the to-be-achieved bill and the certificate to packaging and warehousing. The invention not only reduces manpower and material resources, but also improves the productivity, ensures the test precision, can also ensure the safety of test personnel, equipment and products, and really realizes the uniform and flexible allocation of test resources.

Description

Intelligent testing method for mutual inductor

Technical Field

The invention belongs to the technical field of mutual inductors, and particularly relates to an intelligent testing method for a mutual inductor.

Background

The routine test item is the last inspection gateway before the transformer manufacturing enterprise leaves the factory, the transformer manufacturing enterprise can leave the factory after passing strict and accurate routine tests, the process is to firstly carry out power frequency voltage withstand (induction voltage withstand for the voltage transformer) and partial discharge tests, then to transfer to the next station to carry out polarity, accuracy level, excitation characteristic, direct current resistance, insulation resistance and other inspection items, to carry out a series of wiring tests and to give an inspection report qualification certificate after passing, and then to transfer to the next procedure to package and leave the factory. At present, the conventional mutual inductor test routine process needs multi-person operation, manual transfer, high labor intensity and low detection efficiency, and meanwhile, potential safety hazards such as electric shock exist, so that an intelligent mutual inductor detection system and method are urgently needed to be developed, intelligent automatic detection can be realized, wiring detection can be carried out by one person, manual transfer is not needed, and the labor intensity is low, so that the factory test routine efficiency of a production enterprise is improved.

The conventional test process has problems:

1. 3 persons are required to operate simultaneously when the traditional test device is used for product test to ensure safety;

2. the traditional test device needs to select a plurality of circuits for error, volt-ampere and no-load tests, and is complicated;

3. during the test of the traditional test device product, the operations of switching guide resistance, switching standard, switching load and the like all need to be operated by a tester;

4. test data of the traditional test device needs to be recorded by personnel and then is input into a system, and whether a test result is qualified or not is identified for the second time;

5. in the traditional voltage test device, because the secondary voltages of the voltage transformers are various, the test circuit can only be connected with a limited number of load box devices, and the test circuit and the test device need to be frequently replaced by test personnel in the test process;

the traditional mutual inductor is complicated in routine test process, intelligent tests cannot be achieved, one person is still manually transferred to carry out wiring, the other person is still used for detection, test data is manually recorded, labor intensity is high, and safety coefficients and detection efficiency are low.

Disclosure of Invention

In order to solve the existing problems, the invention provides: an intelligent test method for a mutual inductor comprises the following steps of: in the assembly line operation, on shifting the assembled current transformer finished product to special tray, adopt the electric motor car to transport to the test wire head end, carry out following step in proper order:

s11, carrying out a voltage withstand test on the current transformer;

s12, detecting partial discharge of the current transformer;

s13, pressing the forward button to the next station to perform a direct current resistance measurement test;

s14, performing an insulation resistance measurement test;

s15, pressing a forward button to a next station, and carrying out a polarity accuracy test of the current transformer;

s16, carrying out volt-ampere characteristic detection test on the current transformer;

after being printed, the to-be-achieved list certificate is tied on a current transformer and is transported to a package for storage by an electric vehicle;

the specific test operation process of the voltage transformer is as follows: the assembled voltage transformer finished product is transferred to a special tray, an electric vehicle is adopted to transfer the voltage transformer finished product to the head end of a test line, and the following steps are sequentially carried out:

s21, performing a secondary end power frequency withstand voltage test of the voltage transformer;

s211, performing a power frequency withstand voltage test on the secondary wiring terminal of the voltage transformer to the ground through a high-voltage test bed;

s22, performing primary end power frequency withstand voltage test;

s221, completing a primary-to-secondary and ground power frequency voltage withstand test through a power frequency manual measurement and control system, a power frequency test transformer, a voltage division coupling capacitor and a power frequency peak value table;

s23, induction withstand voltage test;

s231, completing an induction voltage withstand test through a variable frequency power supply generator, a power frequency manual measurement and control system, a power frequency test transformer, a voltage division coupling capacitor and a power frequency peak meter;

s24, measuring partial discharge of the voltage transformer;

s241, completing partial discharge measurement through a variable frequency power supply generator, a power frequency manual measurement and control system, a power frequency test transformer, a voltage division coupling capacitor, a power frequency peak value meter and a multi-channel digital partial discharge detector;

s25, measuring the primary and secondary direct current resistance of the voltage transformer;

s251, completing primary and secondary direct current resistance measurement through a direct current resistance tester;

s26, measuring the insulation resistance of the voltage transformer;

s261, completing insulation resistance measurement through an insulation resistance tester;

s27, detecting the excitation characteristic of the voltage transformer;

s271, completing no-load detection of the excitation characteristic through an intelligent electric quantity tester;

s28, performing inflection point voltage test on the voltage transformer;

s281, completing an inflection point voltage test through a characteristic tester;

s29, testing the accuracy of the voltage transformer;

s291, automatically completing detection by the intelligent test system of the voltage transformer;

s210, performing an open triangle test on the voltage transformer;

s2101, finishing an open triangular test by using a residual voltage tester of the three-phase transformer;

the to-be-achieved list certification is printed and tied on a voltage transformer, and the to-be-achieved list certification is transported to a package for storage by an electric vehicle.

The invention has the beneficial effects that:

compared with the traditional test process, the invention has the following steps:

1. for 3 people concurrent operation that need of assurance safety when traditional testing arrangement product is experimental, only need 1 people now, and efficiency promotes and experimental accurate to some extent.

2. A plurality of sets of circuits are required to be selected in the traditional test device for error, volt-ampere and no-load tests, and the test device is more complicated and only needs one set of circuits at present.

3. When a traditional test device product is tested, operations such as switching guide resistance, switching standards, switching loads and the like need to be operated by a tester, and all the operations are automatically completed.

4. The test data of the traditional test device needs to be recorded by personnel and then is input into the system, whether the test result is qualified or not is identified for the second time, the test result is automatically extracted by a software system, the score is automatically stored and checked in real time, and a prompt box is added by voice to prompt whether the score of the tester is qualified or not.

5. The traditional voltage test device is various due to secondary voltage of a voltage transformer, the traditional current test device is various due to secondary current load of the current transformer, a test circuit can only be connected with a limited number of load box devices, test circuits and test devices need to be frequently replaced by test personnel in the test process, the number of the types of the load box devices is not limited, and the intelligent test system is used for completely controlling the test device.

The traditional mutual inductor has complicated routine test process, intelligent test cannot be realized, one person is manually transferred to connect the wire and the other person for detection, test data is manually recorded, the labor intensity is high, and the detection efficiency is low, so that an intelligent detection method and an intelligent detection system are urgently needed by production enterprises, the assembly line detection can be realized, the intelligent automatic detection can be realized, the labor intensity of detection personnel is reduced, and the misoperation is reduced; and secondly, the safety factor and the detection efficiency are improved.

From the safety perspective of personnel, equipment and products: the tester does not need to directly contact the power equipment, so that the electric shock accident caused by equipment electric leakage is fundamentally solved; the equipment management adopts standardized and systematic centralized control, so that the damage of the test equipment caused by errors in human operation is avoided; the intelligent test system is provided with a systematic and physical alarm protection function, so that the influence of the abnormal test equipment on the product is reduced to the maximum extent.

And (3) analyzing from the perspective of accuracy and reliability of detection data: the data generated in the test process is automatically captured to the information system platform by the information system, so that the writing error generated when the tester records is avoided. Moreover, the test result is judged whether to be qualified or not by the system, so that errors caused by misjudgment of testers are avoided; and (3) sampling data in the test process, and completely adopting a system self-sampling mode. The reasonable control is adopted within the range of the design requirement of the product, so that the influence of excessive intervention of testers on the product test result is avoided.

The analysis is carried out from the perspective of high detection efficiency: in order to guarantee the safety of testers, equipment and products to a high degree, 3 testers are required to complete the test process simultaneously according to the original regulations; corresponding work can be completed by only 1 tester, so that the problem of personnel redundancy is solved; the original test circuit has multiple sets of test circuits, multiple devices, high wiring frequency and low test circuit concurrency, so that test personnel operate frequently, the labor intensity is increased, and the working efficiency is reduced; the method has the advantages that the standardization and systematization centralized control is adopted, the line concurrency is increased, the wiring frequency is optimized, the labor intensity of testers is greatly reduced, the working efficiency is improved, and the life cycle of a product in the test process is greatly shortened; the training post-working period of the original new staff is long, and the field production requirement cannot be met in time; the intelligent test system for the current transformer is modularized in management, systematized in service, integrated in process and automatic in operation, only needs short-period training practice for testers, can work on duty, solves the problems that the skills of the testers are different in level and fatigue degree, the work efficiency is different, and continuous and stable output is guaranteed.

From the comprehensive point of view: the intelligent testing system for the mutual inductor has the advantages that the research and development success is realized, manpower and material resources are reduced, the productivity is improved, the testing accuracy is guaranteed, the safety of testing personnel, equipment and products can be guaranteed, and the unified and flexible allocation of testing resources is realized in the true sense.

Drawings

FIG. 1 is a flow chart of an intelligent testing method for a transformer of the present invention;

FIG. 2 is a schematic diagram of a power frequency withstand voltage test circuit of the current transformer of the present invention;

FIG. 3 is a schematic diagram of a partial discharge test circuit of the current transformer of the present invention;

FIG. 4 is a schematic diagram of a polarity accuracy test circuit of the current transformer of the present invention;

FIG. 5 is a schematic diagram of a power frequency withstand voltage test circuit of the voltage transformer of the present invention;

FIG. 6 is a schematic diagram of a partial discharge test circuit of the voltage transformer of the present invention;

FIG. 7 is a schematic diagram of a polarity accuracy test circuit of the voltage transformer of the present invention;

FIG. 8 is a relational diagram of an intelligent test system for a transformer of the present invention;

FIG. 9 is a circuit diagram of the accuracy testing of the intelligent testing system of the current transformer of the present invention;

FIG. 10 is a circuit diagram of a PLC control system of the intelligent test system of the current transformer of the present invention;

FIG. 11 is a current-voltage characteristic circuit diagram of the intelligent test system of the current transformer of the present invention;

FIG. 12 is a circuit diagram of the accuracy and no-load test of the intelligent test system of the voltage transformer of the present invention;

FIG. 13 is a voltage load box switching circuit diagram of the intelligent testing system of voltage transformers of the present invention;

fig. 14 is a circuit diagram of a PLC control system of the intelligent test system for a voltage transformer of the present invention.

Detailed Description

An intelligent test method for a mutual inductor comprises a current mutual inductor and a voltage mutual inductor, as shown in figure 1, the specific test operation process of the current mutual inductor is as follows: in the assembly line operation, on shifting the assembled current transformer finished product to special tray, adopt the electric motor car to transport to the test wire head end, carry out following step in proper order:

s11, carrying out a withstand voltage test on the current transformer;

s12, detecting partial discharge of the current transformer;

s14, performing an insulation resistance measurement test;

s16, carrying out a volt-ampere characteristic detection test on the current transformer;

printing a to-be-achieved note and a qualified certificate, tying the to-be-achieved note and the qualified certificate on a current transformer, and transferring the to-be-achieved note and the qualified certificate to a package and warehousing by adopting an electric vehicle;

s22, performing primary end power frequency withstand voltage test;

s23, induction withstand voltage test;

s24, measuring partial discharge of the voltage transformer;

s241, completing partial discharge measurement through a variable frequency power supply generator, a power frequency manual measurement and control system, a power frequency test transformer, a partial pressure coupling capacitor, a power frequency peak value meter and a multi-channel digital partial discharge detector;

s26, measuring the insulation resistance of the voltage transformer;

s27, detecting the excitation characteristic of the voltage transformer;

s28, performing inflection point voltage test on the voltage transformer;

s29, testing the accuracy of the voltage transformer;

s291, automatically completing detection by the intelligent voltage transformer testing system;

s210, carrying out an open triangle test on the voltage transformer;

In step S11 and steps S21 to S23, as shown in fig. 2 and fig. 5, the voltage values of the withstand voltage tests of the current transformer and the voltage transformer are adjusted by the power frequency test transformer, the power frequency manual measurement and control system starts to close the test button, the digital display time relay on the power frequency manual measurement and control system control cabinet tests the time, the power frequency peak meter monitors the voltage value of the test circuit, the voltage value is increased and decreased by the column contact voltage regulator, the partial pressure coupling capacitor transmits signals without partial discharge, the frequency conversion power frequency switching operation of the variable frequency power supply control cabinet is completed, the primary winding terminal of the current transformer to be tested is well connected with the secondary winding terminals and the grounding terminal test circuit, the ground power frequency is firstly subjected to withstand voltage, and then the ground power frequency is subjected to withstand voltage for two times to complete the power frequency withstand voltage test.

In step S12 and step S24, as shown in fig. 3 and fig. 6, the partial discharge test process of the current transformer and the voltage transformer is as follows: the power frequency manual test system adjusts a voltage value through a power frequency test transformer, transmits signals through a partial discharge-free voltage-dividing coupling capacitor, detects a test line voltage value through a power frequency peak value table, starts a test button to be closed after a primary winding terminal, secondary winding terminals and a grounding terminal test circuit of a tested current transformer are connected, starts a multichannel digital partial discharge detector at the same time, performs partial discharge square wave calibration by adopting a correction pulse generator, rotates a column type contact voltage regulator voltage boosting and reducing voltage value knob after no error, boosts to a required voltage value, reduces to a measurement voltage value to perform partial discharge detection, and presses an advancing button to a next station after detection is finished.

In step S13 and step S25, the test process of measuring the direct current resistance of the current transformer and the voltage transformer is as follows: in the direct current resistance measurement test, two terminals of a primary winding and two terminals of each secondary winding of the current transformer to be measured are connected with a loop resistance tester to respectively carry out primary and secondary direct current resistance measurement, and after the detection is finished, an advancing button is pressed to the next station.

In step S14 and step S26, the insulation resistance testing process of the current transformer and the voltage transformer is as follows: and connecting one end of the winding to be tested to an insulation resistance tester, grounding the other end of the insulation resistance tester or measuring the insulation resistance between the secondary winding and the ground at the first time by one end of the other winding, and pressing an advancing button to the next station after the detection is finished.

In step S15 and step S16, as shown in fig. 4, the polarity accuracy inspection automation test process of the current transformer includes: the current transformer is detected by a current transformer calibrator, difference is obtained by adopting a difference method principle, parameters such as a detected calibration point, a specific difference, an angle difference and the like are displayed by numbers, test data are read by test software, and the judgment of the transformation ratio of the detected current transformer is judged, whether wiring is correct or not and whether wiring is open-circuited or not are judged.

In the step S27 and the step S29, as shown in fig. 7, the voltage transformer polarity accuracy check automated testing process: the voltage transformer is detected by the voltage transformer calibrator, difference is obtained by adopting a difference method principle, parameters such as a detected calibration point, a ratio difference and an angle difference are displayed by numbers, test data are read by test software, and the judgment of the transformation ratio of the detected voltage transformer, whether wiring is correct and whether wiring is short-circuited is judged, the voltage transformer load box is used as a secondary load of the detected transformer during the accuracy test of the voltage transformer, the standard control box controls the transformation ratio gear conversion of the standard voltage transformer, and the intelligent electric quantity tester measures the excitation characteristic no-load current and the power loss test of the voltage transformer.

The operating system of the invention is as follows:

as shown in fig. 9, the accuracy testing circuit diagram of the current transformer intelligent testing system: the contactor KM1 is attracted, the input of the contact voltage regulator T1 is electrified, the output is connected to the input end of a T2 high-current transformer through a contactor KM2, the output of the T2 is connected to a primary terminal L (public end) of a standard current transformer, tb, L1 and L2 are respectively connected to contactors KM34, KM35 and KM36 to a primary terminal of a tested product. The measurement lead group switching contactors KM 3-KM 8 are connected to a current transformer calibrator K1x through a current load box, the secondary short-circuit contactors KM 21-KM 26 of the test products are connected to lead group end groups 1-6, and the common ends of the open-circuit voltage test switching contactors KM 9-KM 14 are connected to the input end of a PT106 current transformer open-circuit voltage tester.

As shown in fig. 10, the PLC control circuit diagram of the current transformer intelligent test system includes: the device comprises a Programmable Logic Controller (PLC), a relay, a circuit breaker, an alternating current contactor, a contact voltage regulator, a transformer, a standard current transformer, an electricity measuring instrument, a transformer, an overcurrent relay, a current transformer open circuit voltage tester, a voltage transformer, a large current transformer and a current transformer calibrator. The PLC is communicated with the PC upper computer, a protection function is formed by limit switches (SQ 1-SQ 8) at the input end of the PLC, and the output of the PLC drives relays (KA 1-KA 7) and alternating current contactors (KM 3-KM 32) to complete corresponding function conversion requirements.

As shown in fig. 11, a current-voltage characteristic testing circuit diagram of the current transformer intelligent testing system: the contactor KM31 is attracted, the input of the contact voltage regulator T is electrified, the output of the contact voltage regulator T is connected to the contactor KM6, the output of the contact voltage regulator T is connected to the contactor KM7 through the transformer T5, the output of the contactor KM7 is connected to the input end of the electric quantity measuring instrument, the contactors KM8 and KM9 form a large volt-ampere test, the output of the electric quantity measuring instrument is connected to the output common end of the error test switching guide group contactor through a volt-ampere test switching contactor.

As shown in fig. 14, the PLC control circuit diagram of the intelligent test system for voltage transformers includes a PLC programmable controller, a relay, a circuit breaker, an ac contactor, a contact voltage regulator, a control transformer, a standard voltage transformer, a power measuring instrument, a transformer, and an overcurrent relay. The PLC is communicated with the PC upper computer, and the relays (KA 1-KA 14) and the alternating current contactors (KM 5-KM 41) are driven by the PLC output to meet corresponding conversion requirements.

As shown in fig. 12, the accuracy and no-load test circuit diagram of the intelligent test system for the voltage transformer is as follows: the AC contactors KM1 and KM2 are attracted, the T1 contact voltage regulator is electrified, the output end of the T1 contact voltage regulator is connected to the input end of the control transformer through a current relay, each output end of the control transformer is connected to a T3 booster transformer or a T4 booster transformer and a PT1 standard voltage transformer and a PT2 standard voltage transformer through the conversion of the AC contactors KM 31-KM 41, and secondary output terminals of the standard voltage transformers are respectively connected to PT1 (KM 23, KM 24) and PT2 (KM 42). The error test secondary wiring is 3 groups in total, and switching is carried out through KM 25-KM 27.

And (3) no-load test: the AC contactor KM3 is attracted, the input end of the contact voltage regulator T5 is electrified, the output end of the contact voltage regulator T5 is connected into two voltage class test switching AC contactors (KM 45 and KM 46), the public end of the contact voltage regulator is connected with the input end of a power measuring instrument PF9805, and the output end of the contact voltage regulator T is connected into a test lead group switching AC contactor (KM 5-KM 7).

As shown in fig. 13, the load box switching circuit diagram of the intelligent test system for voltage transformers is as follows: the alternating current contactors KM 8-KM 30 are used for respectively connecting 6 voltage load boxes into the test guide groups, and each voltage load box can be randomly distributed to each test guide group according to test requirements.

As shown in fig. 8, the intelligent testing system for the mutual inductor is composed of an MES software information platform, a PLC control system, a control unit, an execution unit, a test detection device, a test line device and a display unit, wherein the PLC control system is connected with the execution unit through the control unit, and the test detection device and the test line device are connected with the MES software information platform.

The main functions of the intelligent test system of the mutual inductor are as follows:

1. the method comprises the steps of automatically detecting the accuracy of the mutual inductor, and automatically switching guide groups (levels), standards, test items, control units, extracting test equipment data and the like according to specific information of product 'table building' in a software system.

2. The open circuit test is automatically carried out on the current transformer, and the guide group (level), the standard, the test item, the control unit and the test equipment data are automatically switched according to the specific information of product 'table building' in a software system.

3. And performing auxiliary test on the volt-ampere item of the current transformer, and performing soft control switching on a guide group (level), automatic switching on a test item, automatic switching on a control unit, automatic extraction of test equipment data and the like according to specific information of a product.

4. Performing auxiliary test on the no-load item of the voltage transformer, and performing soft control switching guide group, automatic switching test item, automatic switching control unit, automatic extraction of test equipment data and the like according to specific product information;

5. a data information platform: the intelligent test system information platform of the mutual inductor is a matrix screen consisting of 12 70-inch screens, and is used for intensively displaying test site monitoring and test data (information data such as error data, curves, temperature and humidity).

The assembly line work, the mutual-inductor finished product that has assembled shifts to special tray on, adopt the electric motor car to transport to the test wire head end, withstand voltage, partial discharge detects at first, press the forward button to next station after accomplishing, carry out direct current resistance, insulation resistance, excitation characteristic etc. and inspect, press the forward button to next station after accomplishing, carry out polarity, the detection of the degree of accuracy, the intelligent automation of this process is accomplished, reach the test wire end after accomplishing, wait that the score list qualification certificate is printed and is tied and adopt the electric motor car to transport to packing warehouse entry on the mutual-inductor.

The voltage-withstand test and the partial discharge test are both carried out in a fully shielded room, the wiring test can be independently completed by one person, the standard is set according to the technical parameters of the product, then the primary and secondary power frequency voltage-withstand tests are carried out, then the partial discharge test is carried out (if needed), and the test is completed and then the test is transferred to the next station;

the detection of the insulation resistance is manually finished, the detection of the direct current resistance, the excitation characteristic, the polarity and the accuracy is intelligently and automatically finished, firstly, the test standard is extracted according to the technical parameters of the product, the accurate test operation button is automatically finished, the data is extracted according to the number of standard points, the data is stored and extracted, and finally, the paper quality certificate generated by printing is printed and tied on the mutual inductor;

in the test process of a product, inspectors need to frequently operate the power equipment, and when equipment failure or misoperation occurs, the system automatically gives an alarm, so that electric shock accidents cannot occur.

When the inspection personnel operate the equipment to test the product and record the test result, the system automatically extracts the test data, a plurality of devices run simultaneously, different equipment parameters are adjusted according to different products, and the products cannot be unqualified to leave factory.

2-3 persons are needed for matching optimization personnel in the test process, so that continuous and stable output is ensured; the training post-working period of new staff is short, the detection environment can be quickly adapted, and the requirements of inspectors are met; the wiring process is optimized, the number of product test lines is multiple, different lines need to be changed in the test process, and the test project can be completed by wiring for multiple times.

The excitation characteristic, polarity and accuracy detection process is as follows:

extracting test standards according to technical parameters of products, automatically completing accurate test operation buttons, extracting data according to the number of standard points, storing the data, extracting the data, and finally printing to generate a paper certificate which is tied on a current transformer;

firstly, according to the setting of specific parameters of products in a software information platform, a control system can automatically switch a guide group, a standard, a test level, a control unit and a test circuit;

then, controlling and driving servo motor equipment to drive a current adjusting device to carry out current rising or current falling;

finally, in the test process, the MES software information platform simultaneously collects test data information measured by the instrument, finally displays the test result, judges whether the test result is qualified or not and stores the test result;

the tester selects the information of the detected product, and the system loads the information in order according to the 'table building' data;

a tester selects a terminal in the loaded data, sets a test circuit scheme and a test accuracy item, and clicks a start button to detect; the system carries out automatic detection by combining the operation result of the tester;

the system sends the pilot group and the test project data to the PLC, sends the transformation ratio data to the calibrator, sends the load data to the load box, and then sends the start instruction to the PLC, namely, the full-automatic detection process starts, the PLC drives the voltage regulating device to raise and lower the voltage, the detection process is subject to the upper limit and the lower limit, the data in the calibrator is automatically stored in the detection interface in combination with the percentage requirement of precision, when the product terminals in the test circuit scheme are all detected, the system can send the stop instruction to the PLC, namely, the whole test process is finished, and the closed loop is finished.

In step S16, the excitation characteristic detection is executed by the specific steps including:

building a table: before a product detection test, a tester needs to establish basic information of a terminal, a transformation ratio, precision, load and an excitation characteristic voltage value of a product in a system.

The excitation characteristic detection test process is as follows:

firstly, testing personnel select to detect product information, and the system loads in order according to 'tabulation' data;

then, a tester selects a terminal with excitation detection in the loaded data, sets a test circuit scheme and a test no-load item, and clicks a start button to detect;

the system sends the pilot group and the test item data to the PLC, then sends a starting instruction to the PLC, namely, the detection process starts, the voltage regulating device is manually driven to rise and fall, the system sets the data range of the voltage by combining with meter building, the current data and the no-load loss data in the power meter are automatically stored in a detection interface, after the detection is manually judged and finished, a stop button is operated, the system sends the stopping instruction to the PLC, and then, the excitation characteristic detection test is finished.

Wherein, the test starting and the test intermediate process of the polarity accuracy test are provided with alarm mechanisms and are provided with corresponding execution strategies;

the intelligent test system performs state detection on the key nodes of the equipment at the beginning stage of the test: wiring accuracy, transformer range error and equipment limit state;

and (3) carrying out state monitoring on the middle process of the experiment: out of application range, open wiring, serious wiring error, instrument failure;

when fault alarm prompt occurs in the whole test process, the instruction of the test system is stopped, the test line is interrupted and returns to the original point, the test system can be started again after the fault is eliminated, and the whole process is provided with voice prompt.

The specific process of the alarm mechanism is as follows:

the alarm mechanism adopts 3 modes of active power failure, voice single broadcast and text prompt for the test circuit, and alarm information comes

From PLC controller and check gauge, to current transformer intelligent test system specifically as follows:

1) And the alarm information comes from the PLC controller and comprises the following situations, and the voice sheet broadcasting and the corresponding character prompting are carried out:

(1): fault of low limit switch 1 of large voltage regulator

(2): fault of lower limit switch 2 of large voltage regulator

(3): fault of limit switch on large voltage regulator

(4): lower limit 2 switch fault of small regulator

(5): fault of limit switch on small voltage regulator

(6): fault of low limit switch 1 of small voltage regulator

(7): limiting fault under volt-ampere

(8): volt-ampere upper limit fault

2) The alarm information comes from the check gauge and comprises the following conditions, and the voice list broadcasting and corresponding text prompting are carried out:

(1): exceeding the application range, not raising the test current continuously;

(2): the measuring range of the mutual inductor is wrong;

(3): a polarity error;

(4): the polarity of the mutual inductor is wrong, and the measuring range is wrong;

(5): secondary open circuit of the tested mutual inductor;

(6): the instrument is out of order and cannot work;

(7): and (5) serious wiring errors are caused, and the current is not continuously increased.

(8): current boost overrun

The intelligent test system for the voltage transformer specifically comprises the following steps:

(1): fault of limit switch under error

(2): fault of limit switch on error

(3): no load lower limit switch fault

(4): no load upper limit switch fault

2) The alarm information comes from the check gauge and includes following situation to carry out the plain report and correspond the text suggestion:

(1): the instrument is out of order and cannot work;

(2): the measuring range of the mutual inductor is wrong;

(3): a polarity error;

(5): secondary open circuit of the tested mutual inductor;

(6): a serious wiring error, the voltage is not required to be continuously increased;

(7): the primary voltage exceeds the measured voltage greatly, so that the use is safe;

(8): the primary voltage exceeds the standard voltage greatly, so that the use is safe;

(9): the voltage between Ao and Xo exceeds the maximum range of the instrument, and the voltage is not required to be increased continuously.

Alarm reset follow-up operation: after all alarms are generated, a tester needs to click a 'stop' button system to reset, and meanwhile, a reset instruction is sent to the PLC, namely, the equipment is reset to carry out current instructions and subsequent operations.

The functions and the purposes of all instruments and equipment of the intelligent test system of the current transformer are as follows:

1. current transformer calibrator

The functions are as follows: the current transformer calibrator is a special instrument for calibrating current transformers, adopts the principle of a difference method to perform difference taking, and then displays parameters such as a calibration point, a specific difference, an angle difference and the like which are tested by using numbers.

The function is as follows: the instrument reads test data through test software, converts functions and judges in the test process, such as the judgment of the transformation ratio of the tested current transformer, the correctness of wiring, the open circuit of the wiring and the like.

2. Open circuit tester for current transformer

The functions are as follows: the method is used for measuring the voltage peak value of each second of open circuit when the current transformer performs a secondary open circuit insulation test.

The function is as follows: the instrument reads the test data through the test software.

3. Current transformer load box

The functions are as follows: the secondary load is used as the secondary load of the tested transformer when the accuracy of the current transformer is tested.

The function is as follows: the instrument switches and controls the measuring range and the impedance (load) of the load box through test software and RS485 communication according to the selection of the secondary load during the accuracy test of the tested mutual inductor.

4. Standard two-stage current transformer

The functions are as follows: when the current transformer is used for the accuracy test of the current transformer, the current transformer is used as a standard current transformer.

The function is as follows: the instrument is provided with a range control box, and through RS485 communication, when the accuracy test is carried out according to the tested mutual inductor, the transformation ratio switching is carried out. The current transformer calibrator is matched with a current transformer calibrator.

5. Intelligent electric quantity tester

The functions are as follows: the method is used for testing the volt-ampere characteristic of the current transformer.

The function is as follows: when the instrument is used for testing the volt-ampere characteristic of the current transformer, test data are read through test software.

6. Control cabinet of intelligent test system of current transformer

The functions are as follows: the device is used for test item conversion, lead group switching, a control unit and the like during current transformer test.

The function is as follows: when the current transformer tests, the control execution unit that the controller (programmable controller) and test software in the switch board constitute mainly includes: the method comprises the steps of test item conversion, error group switching, voltage regulator device control, large current conversion device control, test power supply main loop control, test protection device control and the like.

7. Current regulator (Voltage regulator)

The functions are as follows: when the adjustable power supply device is used for the accuracy test of the current transformer, the adjustable power supply device is provided for the large-current transformer of the large-current conversion device.

The function is as follows: when the accuracy of the current transformer is tested, a controller in the control cabinet controls the servo driver to drive the servo motor to drive the voltage regulating mechanism, 0-450V voltage is output, and variable current is generated and used as a calibration point for the tested current transformer.

8. Large current conversion device

The functions are as follows: and converting the primary current of the standard current transformer.

The function is as follows: the standard current transformer has three terminals at a time, and switching is performed in the testing process, so that the switching is performed by using a high-current conversion device through a controller in a control cabinet.

The equipment models used by the current transformer test system are as follows:

industrial frequency test transformer YDTW-75/150,

Power frequency peak value table FZ-820,

Column contact transformer TEDGZ-75,

An industrial frequency manual measurement and control system IAM-1000,

Multi-channel digital partial discharge detector JFD-2010,

A correction pulse generator JZF-10,

Loop resistance tester HYHL-III,

Insulation resistance tester KEW3122A,

A current transformer calibrator HESA-BF,

A current load box FY51-BF,

Electric quantity measuring instrument PF9805,

Current transformer open circuit tester CT106-BF

A standard control box CTBFI,

A standard two-stage current transformer BDL-I,

There is no partial voltage coupling capacitor FOF-150kV/300pF.

The function and the purpose of each instrument and equipment of the intelligent test system of the voltage transformer are as follows:

1. voltage transformer calibrator

The functions are as follows: the voltage transformer calibrator is a special instrument for calibrating a voltage transformer, adopts the principle of a difference method to perform difference taking, and then displays parameters such as a calibration point, a specific difference, an angle difference and the like of a test by using numbers.

The function is as follows: and the test software samples data through the R232 interface and performs transformation ratio setting through the RS485 interface, and judges in the test process, such as the transformation ratio judgment of the tested voltage transformer, whether the wiring is correct, whether the wiring is open-circuit and the like.

2. Voltage transformer load box

The functions are as follows: the secondary load is used as the secondary load of the tested transformer when the accuracy of the voltage transformer is tested.

The function is as follows: the instrument switches and controls the range and the impedance (load) of the load box through test software and RS485 communication according to the selection of the secondary load during the accuracy test of the tested mutual inductor.

3. Standard voltage transformer

The functions are as follows: when the voltage transformer is used for the accuracy test of the voltage transformer, the voltage transformer is used as a standard voltage transformer.

The function is as follows: the instrument is provided with a range control box, and through RS485 communication, when the accuracy test is carried out according to the tested mutual inductor, the transformation ratio switching is carried out. The voltage transformer calibrator is matched with a voltage transformer calibrator.

4. Intelligent electric quantity tester

The functions are as follows: the method is used for testing the excitation characteristic of the voltage transformer.

The function is as follows: when the instrument is used for testing the no-load current and the power loss of the excitation characteristic of the voltage transformer, test software reads the no-load current and the power loss test data through an RS232 interface.

5. Intelligent test system control cabinet for voltage transformer

The functions are as follows: the device is used for test item conversion, guide group switching, a control unit and the like during voltage transformer test.

The function is as follows: when the voltage transformer tests, the control execution unit that the controller (programmable controller) and test software in the switch board constitute mainly includes: the method comprises the steps of conversion of test items, switching of error guide groups, control of a voltage regulator device, control of a test power supply main loop, test of a protection device and the like.

The voltage transformer test system uses the following equipment types:

industrial frequency test transformer YDTW-75/150,

Power frequency peak value table FZ-820

Column contact transformer TEDGZ-75,

An industrial frequency manual measurement and control system IAM-1000,

Multi-channel digital partial discharge detector JFD-2010,

A correction pulse generator JZF-10,

A variable frequency power supply SOYI-31030,

Loop resistance tester HYHL-III

Insulation resistance tester KEW3122A,

A voltage transformer calibrator PT101-BF,

Voltage load boxes FY50-BF, FY51-BF, FY52-BF

Electric quantity measuring instrument PF9805,

Standard control box CTBFI

Precision voltage transformer HJ12-35Y02/02

Residual voltage tester for SYCS-1608 type three-phase mutual inductor,

SYCS-1802 type characteristic tester,

There is no partial voltage coupling capacitor FOF-150kV/300pF of partial voltage of partial discharge.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and their concepts of the present invention within the technical scope of the present invention, and equivalent substitutions or changes are included in the technical solutions and their concepts.

Claims

1. The intelligent testing method of the mutual inductor is characterized in that the mutual inductor comprises a current mutual inductor and a voltage mutual inductor, and the specific test operation process of the current mutual inductor is as follows: in the assembly line operation, on shifting the assembled current transformer finished product to special tray, adopt the electric motor car to transport to the test wire head end, carry out following step in proper order:

s11, performing a withstand voltage test of the current transformer;

s12, performing partial discharge detection of the current transformer;

s13, pressing a forward button to a next station, and performing a direct current resistance measurement test;

s14, executing an insulation resistance measurement test;

s16, executing a volt-ampere characteristic detection test of the current transformer;

the specific test operation process of the voltage transformer is as follows: on shifting over to special tray with the assembled voltage transformer finished product, adopt the electric motor car to transport to the test wire head end, carry out following step in proper order:

s22, executing a primary end power frequency withstand voltage test;

s23, performing an induction withstand voltage test;

s24, performing partial discharge measurement of the voltage transformer;

s25, performing primary and secondary direct current resistance measurement of the voltage transformer;

s26, measuring the insulation resistance of the voltage transformer;

s27, detecting the excitation characteristic of the voltage transformer;

s28, performing an inflection point voltage test of the voltage transformer;

s29, performing an accuracy test of the voltage transformer;

s210, executing an open triangle test of the voltage transformer;

2. The intelligent testing method of the mutual inductor according to claim 1, wherein in steps S11 and S21-S23, the withstand voltage tests of the current mutual inductor and the voltage mutual inductor adjust the voltage value through a power frequency testing transformer, a power frequency manual measurement and control system starts a closing test button, a digital display time relay on a control cabinet of the power frequency manual measurement and control system tests time, a power frequency peak meter monitors the voltage value of a test circuit, a column contact voltage regulator steps up and steps down the voltage value, no partial discharge partial voltage coupling capacitor transmits signals, the variable frequency power supply control cabinet performs the variable frequency and power frequency switching operation, the test circuit of the primary winding terminal, the secondary winding terminals and the grounding terminal of the tested current mutual inductor is well connected, the primary ground frequency withstand voltage is firstly performed, and then the secondary and ground frequency withstand voltage are performed to complete the power frequency withstand voltage test.

3. The intelligent testing method for mutual inductors according to claim 1, wherein in the steps S12 and S24, the partial discharge test processes of the current transformers and the voltage transformers are as follows: the power frequency manual testing system adjusts a voltage value through a power frequency testing transformer, transmits signals without a partial discharge voltage-dividing coupling capacitor, detects a voltage peak value of a testing circuit through a power frequency peak value table, after a primary winding terminal, secondary winding terminals and a grounding terminal testing circuit of a tested current transformer are connected, a power frequency manual measurement and control system starts a test closing button, a multi-channel digital partial discharge detector is started at the same time, a correction pulse generator is adopted to carry out partial discharge square wave calibration, a rotary column type contact voltage regulator voltage boosting and reducing voltage value knob is rotated after error is avoided, the voltage boosting voltage value is increased to a required voltage value, the voltage value is reduced to a measuring voltage value to carry out partial discharge detection, and an advancing button is pressed to the next station after detection is finished.

4. The intelligent testing method for mutual inductor according to claim 1, wherein in the step S13 and the step S25, the test process of measuring the direct current resistance of the current transformer and the voltage transformer is as follows: in the direct current resistance measurement test, two terminals of a primary winding and two terminals of each secondary winding of the current transformer to be measured are connected with a loop resistance tester to respectively carry out primary and secondary direct current resistance measurement, and after the detection is finished, an advancing button is pressed to the next station.

5. The intelligent testing method for transformers according to claim 4, wherein in the steps S14 and S26, the insulation resistance testing processes of the current transformers and the voltage transformers are as follows: and connecting one end of the winding to be tested to an insulation resistance tester, grounding the other end of the insulation resistance tester or measuring the insulation resistance between the secondary winding and the ground at one time by one end of the other winding, and pressing an advancing button to a next station after the detection is finished.

6. The intelligent test method for the mutual inductor according to claim 1, wherein in the step S15 and the step S16, the polarity accuracy inspection automation test process of the current mutual inductor comprises: the current transformer is detected by a current transformer calibrator, difference is obtained by adopting a difference method principle, parameters such as a detected calibration point, a ratio difference and an angle difference are displayed by numbers, test data are read by test software, and the judgment of the transformation ratio of the detected current transformer, the judgment of whether wiring is correct and whether wiring is open-circuited are judged;

in the step S27 and the step S29, the voltage transformer polarity accuracy testing automated testing process: the voltage transformer is calibrated by the voltage transformer calibrator, the difference is obtained by adopting a difference method principle, parameters such as a calibration point, a ratio difference and an angle difference to be tested are displayed by numbers, test data are read by test software, and the ratio judgment, the wiring short circuit judgment, the secondary load of the tested transformer when the accuracy of the voltage transformer is tested are judged by the voltage transformer load box, the standard control box controls the conversion of the ratio gear of the standard voltage transformer, and the intelligent electric quantity tester measures the excitation characteristic no-load current and the power loss test of the voltage transformer.