CN115436731A - Intelligent transformer test system - Google Patents
Intelligent transformer test system Download PDFInfo
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- CN115436731A CN115436731A CN202211106944.8A CN202211106944A CN115436731A CN 115436731 A CN115436731 A CN 115436731A CN 202211106944 A CN202211106944 A CN 202211106944A CN 115436731 A CN115436731 A CN 115436731A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0416—Connectors, terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2688—Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
- G01R27/2694—Measuring dielectric loss, e.g. loss angle, loss factor or power factor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/20—Measuring number of turns; Measuring transformation ratio or coupling factor of windings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses an intelligent transformer test system, which comprises: an industrial control screen; the centralized processing controller unit is electrically connected with the industrial control screen; the test power supply unit is used for providing power supply of corresponding parameters during detection and is electrically connected with the centralized processing controller unit; the measurement and control module unit is used for executing a test task input by the industrial control screen and is electrically connected with the centralized processing controller unit; the input switching module is used for switching sampling signals of different detection items and corresponding acquisition modules in the test power supply unit, and is electrically connected with the centralized processing controller unit; and the output switching module is used for controlling the state of the transformer winding in the measuring process, wherein the state comprises pressurization, open circuit, short circuit or grounding, and the output switching module is electrically connected with the centralized processing controller unit. The problem of prior art carry out that the test time of transformer test is long work efficiency is low is solved.
Description
Technical Field
The invention relates to the technical field of transformer experiments, in particular to an intelligent transformer experiment system.
Background
The power transformer is the main equipment of the power system and has important significance for safe and reliable operation of a power grid. Test practices show that measuring the dielectric loss factor and the insulation resistance of the power transformer is an effective means for judging the insulation state of the power transformer; eighteen major power grid anti-accident measures of the national power grid clearly indicate that the strengthening of the on-load tap-changer test and the short-circuit impedance test has great significance for preventing major insulation accidents of the transformer. In addition, the direct current resistance test and the transformation ratio test are used as conventional test items of the transformer, are indispensable test items after the transformer is handed over, overhauled and changed with a tap changer, and are also important inspection items after faults.
The current situation of preventive tests of power transformers at home and abroad is as follows:
the transformer preventive test comprises tests such as transformer body dielectric loss, sleeve dielectric loss, body insulation resistance, winding direct-current resistance, on-load switch switching beat wave, winding direct-current resistance, low-voltage short-circuit impedance test and the like, the tests need different wiring modes of instruments with completely different principles to carry out measurement, and the tests need to be continuously lifted or even a lifting vehicle is adopted to change the wiring mode and replace different test lines, so that the test time is invisibly increased, and the outage period of a main transformer is prolonged.
At present, except for the provision of a preventive test on the power failure of a power transformer at regular intervals, an electric power department must perform off-line detection if abnormal signs occur in a preventive test period, which plays an active role in preventing serious accidents of the transformer and ensuring safe and reliable power supply. However, long-term working experience also finds that conventional tests have certain limitations:
from the economic perspective, regular tests and maintenance are required to be carried out in a power failure state, so the period of power failure maintenance is valuable, and if a plurality of state maintenance tasks aiming at the power converter equipment can be realized within a specified time, unnecessary economic loss can be reduced.
From the technical perspective, conventional maintenance tests have a lot of inconvenience, wiring among single tests is different, and a tester needs to adjust one wiring during each single test, so that the working efficiency is seriously reduced while the working strength is improved. In addition, repeated wiring easily causes measurement errors, and the accuracy of the test is reduced.
Disclosure of Invention
In order to solve the defects and shortcomings of the prior art, the invention aims to provide an intelligent transformer test system.
The technical scheme of the invention is as follows: an intelligent transformer testing system, comprising:
an industrial control screen;
the centralized processing controller unit is used for managing and controlling the test power supply unit, the measurement and control module unit, the input switching module and the output switching module according to the industrial control screen setting, and is electrically connected with the industrial control screen;
the test power supply unit is used for providing a power supply of corresponding parameters during detection and is electrically connected with the centralized processing controller unit;
the measurement and control module unit is used for executing a test task input by the industrial control screen and is electrically connected with the centralized processing controller unit;
the input switching module is used for switching between sampling signals of different detection items and corresponding acquisition modules in the test power supply unit, and is electrically connected with the centralized processing controller unit;
and the output switching module is used for controlling the state of the transformer winding in the measuring process, wherein the state comprises pressurization, open circuit, short circuit or grounding, and the output switching module is electrically connected with the centralized processing controller unit.
Specifically, the test power supply unit includes:
the variable-frequency high-voltage power supply is used for providing power for dielectric loss test;
the direct-current high-voltage power supply is used for providing power for the insulation resistance test;
the direct current constant current power supply is used for providing power for direct current resistance and on-load switch testing;
and the alternating current power supply is used for providing power for the transformation ratio and short-circuit impedance test.
Specifically, the measurement and control module unit includes:
the system comprises a dielectric loss measurement and control module, a data acquisition module and an industrial control screen, wherein the dielectric loss measurement and control module is used for acquiring data required by dielectric loss measurement and control, a 16-bit ad conversion chip is adopted, one input end of the ad conversion chip inputs a variable-frequency high-voltage signal, the other input end of the ad conversion chip inputs a signal of a tested product, two analog quantities are synchronously acquired, and the ad conversion chip is communicated with the industrial control screen through a 485 bus system;
the insulation resistance measurement and control module is used for collecting data required by insulation resistance measurement and control, a 16-bit ad conversion chip is adopted, one input end of the ad conversion chip inputs a direct-current high-voltage signal, the other input end of the ad conversion chip inputs a signal of a tested product, two analog quantities are synchronously collected, and the ad conversion chip is communicated with the industrial control screen through a 485 bus system;
the transformation ratio measurement and control module is used for collecting data required by transformation ratio measurement and control, a 16-bit ad conversion chip is adopted, alternating voltage signals are input into two input channels of the ad conversion chip, and the ad conversion chip is communicated with an industrial control screen through a 485 bus system;
the short-circuit impedance measurement and control module is used for acquiring data required by short-circuit impedance measurement and control, a 16-bit ad conversion chip is adopted, an alternating voltage signal is input to one input end of the ad conversion chip, an alternating current signal is input to the other input end of the ad conversion chip, two analog quantities are synchronously acquired, and the ad conversion chip is communicated with an industrial control screen through a 485 bus system;
the on-load switch measurement and control module is used for collecting data required by on-load switch measurement and control, a 16-bit ad conversion chip is adopted, direct current signals are input into three input ends of the ad conversion chip, and the ad conversion chip is communicated with the industrial control screen through a 485 bus system;
the direct current resistance measurement and control module is used for collecting data required by direct current resistance measurement and control and comprises 6 ad conversion chips and 6 power isolation modules, each ad conversion chip is electrically connected with a direct current constant current power supply through one power isolation module to form an independent power supply system, wherein the 3 ad conversion chips input direct current voltage, the other 3 ad conversion chips input direct current, and the 6 ad conversion chips are communicated with an industrial control screen through a 485 bus system.
Preferably, the ad conversion chips for the direct current resistance measurement and control module and the insulation resistance measurement and control module adopt ad7705, and the ad conversion chips for the dielectric loss measurement and control module, the on-load switch measurement and control module and the short-circuit impedance measurement and control module adopt ad7656.
Specifically, the output switching module comprises a low-voltage terminal wiring board, a high-voltage terminal wiring board, an output terminal wiring board, a support rod and a push-pull mechanism;
two ends of the support rod are respectively and fixedly connected with a low-voltage terminal wiring board and a high-voltage terminal wiring board, and an output terminal wiring board is connected to the support rod between the low-voltage terminal wiring board and the high-voltage terminal wiring board in a sliding manner;
the push-pull mechanism is arranged between a component consisting of the low-voltage end wiring board, the high-voltage end wiring board and the support rod and the output terminal wiring board, the push-pull mechanism moves to enable the output terminal wiring board to move on the support rod between the low-voltage end wiring board and the high-voltage end wiring board, the stroke of the push-pull mechanism is between the low-voltage end wiring board and the high-voltage end wiring board, and the push-pull mechanism is electrically connected with the centralized processing controller unit;
a low-voltage end static contact is arranged on one side, facing the output terminal wiring board, of the low-voltage end wiring board;
a high-voltage end static contact is arranged on one side, facing the output terminal wiring board, of the high-voltage end wiring board;
and one side of the output terminal wiring board facing the low-voltage end wiring board is provided with a low-voltage end moving contact matched with the low-voltage end static contact, and one side of the output terminal wiring board facing the high-voltage end wiring board is provided with a high-voltage end moving contact matched with the high-voltage end static contact.
Specifically, the push-pull mechanism comprises a stepping motor and a screw rod;
the screw rod is in transmission connection with a rotating shaft of the stepping motor, the screw rod is in threaded connection with the output terminal wiring board, and the stepping motor is electrically connected with the centralized processing controller unit.
Further, the device also comprises a reduction box;
the screw rod is in transmission connection with a rotating shaft of the stepping motor through a reduction gearbox.
Preferably, the support rods comprise 2.
The invention has the beneficial effects that: compared with the prior art, the industrial control screen inputs the test instruction, the centralized processing controller unit controls the output switching module to switch the power supply for testing the output corresponding parameters of the power supply unit according to the test instruction, and controls the input switching module to switch the corresponding acquisition module, so that the tests of body dielectric loss, sleeve dielectric loss, body insulation resistance, winding direct-current resistance, on-load switch switching beat wave, winding direct-current resistance and low-voltage short-circuit impedance are performed on the premise of not changing the wiring mode, the test time is reduced, and the working efficiency is improved.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a circuit structure diagram of the dielectric loss measurement and control module of the present invention;
FIG. 3 is a circuit diagram of the insulation resistance measurement and control module of the present invention;
FIG. 4 is a circuit structure diagram of the ratio-change measurement and control module of the present invention;
FIG. 5 is a circuit structure diagram of the short circuit impedance measurement and control module of the present invention;
FIG. 6 is a circuit structure diagram of the measurement and control module of the on-load switch of the present invention;
FIG. 7 is a circuit structure diagram of the DC resistance measurement and control module of the present invention;
FIG. 8 is a front view of an output switching module of the present invention;
fig. 9 is a perspective view of the output switching module of the present invention.
Detailed Description
The invention will be further described with reference to the following drawings and specific embodiments:
example 1 was carried out:
in order to solve the problem of long test time and low working efficiency of the transformer test in the prior art, referring to fig. 1, the invention adopts an intelligent transformer test system, which comprises: an industrial control screen; the centralized processing controller unit is used for managing and controlling the test power supply unit, the measurement and control module unit, the input switching module and the output switching module according to the industrial control screen setting, and is electrically connected with the industrial control screen; the test power supply unit is used for providing power supply of corresponding parameters during detection and is electrically connected with the centralized processing controller unit; the measurement and control module unit is used for executing a test task input by the industrial control screen and is electrically connected with the centralized processing controller unit; the input switching module is used for switching sampling signals of different detection items and corresponding acquisition modules in the test power supply unit, and is electrically connected with the centralized processing controller unit; and the output switching module is used for controlling the state of the transformer winding in the measuring process, wherein the state comprises pressurization, open circuit, short circuit or grounding, and the output switching module is electrically connected with the centralized processing controller unit.
Test instructions are input through the industrial control screen, the centralized processing controller unit controls the output switching module to switch the power supply for testing the output corresponding parameters of the power supply unit according to the test instructions, and controls the input switching module to switch the corresponding acquisition module, so that body dielectric loss, sleeve dielectric loss, body insulation resistance, winding direct-current resistance, on-load switch switching beat wave, winding direct-current resistance and low-voltage short-circuit impedance tests are performed on the premise of not changing a wiring mode, the test time is reduced, and the working efficiency is improved.
Specifically, referring to fig. 1, the test power supply unit includes: the variable-frequency high-voltage power supply is used for providing power for dielectric loss test; the direct-current high-voltage power supply is used for providing power for the insulation resistance test; the direct current constant current power supply is used for providing power for direct current resistance and on-load switch testing; and the alternating current power supply is used for providing power for the transformation ratio and short-circuit impedance test.
And providing power supplies with corresponding parameters for the corresponding test items.
Specifically, referring to fig. 1 to 7, the measurement and control module unit includes: the dielectric loss measurement and control module is used for acquiring data required by dielectric loss measurement and control, a 16-bit ad conversion chip is adopted, one input end of the ad conversion chip inputs a variable-frequency high-voltage signal, the other input end of the ad conversion chip inputs a signal of a tested product, two analog quantities are synchronously acquired, and the ad conversion chip is communicated with the industrial control screen through a 485 bus system; the insulation resistance measurement and control module is used for collecting data required by insulation resistance measurement and control, a 16-bit ad conversion chip is adopted, one input end of the ad conversion chip inputs a direct-current high-voltage signal, the other input end of the ad conversion chip inputs a signal of a tested product, two analog quantities are synchronously collected, and the ad conversion chip is communicated with the industrial control screen through a 485 bus system; the transformation ratio measurement and control module is used for collecting data required by transformation ratio measurement and control, a 16-bit ad conversion chip is adopted, alternating voltage signals are input into two input channels of the ad conversion chip, and the ad conversion chip is communicated with an industrial control screen through a 485 bus system; the short-circuit impedance measurement and control module is used for collecting data required by short-circuit impedance measurement and control, a 16-bit ad conversion chip is adopted, an alternating voltage signal is input to one input end of the ad conversion chip, an alternating current signal is input to the other input end of the ad conversion chip, two paths of analog quantities are synchronously collected, and the ad conversion chip is communicated with an industrial control screen through a 485 bus system; the on-load switch measurement and control module is used for collecting data required by on-load switch measurement and control, a 16-bit ad conversion chip is adopted, direct current signals are input into three input ends of the ad conversion chip, and the ad conversion chip is communicated with the industrial control screen through a 485 bus system; the direct current resistance measurement and control module is used for collecting data required by direct current resistance measurement and control, and comprises 6 ad conversion chips and 6 power supply isolation modules, wherein each ad conversion chip is electrically connected with a direct current constant current power supply through one power supply isolation module to form an independent power supply system, 3 ad conversion chips input direct current voltage, the other 3 ad conversion chips input direct current, and the 6 ad conversion chips are communicated with an industrial control screen through a 485 bus system.
Preferably, the ad conversion chips for the direct current resistance measurement and control module and the insulation resistance measurement and control module adopt ad7705, and the ad conversion chips for the dielectric loss measurement and control module, the on-load switch measurement and control module and the short-circuit impedance measurement and control module adopt ad7656.
And the high-precision sampling requirement is met.
In order to solve the problem that the measurement accuracy is reduced because the device needs to simultaneously perform a high-voltage test and a low-voltage test, and the leakage of the stray capacitance of the high-voltage test part easily affects the test result of the low-voltage part, in this embodiment, specifically, referring to fig. 8 and 9, the output switching module includes a low-voltage terminal board 1, a high-voltage terminal board 2, an output terminal board 3, a support rod 6, and a push-pull mechanism; two ends of the support rod 6 are respectively and fixedly connected with a low-voltage end wiring board 1 and a high-voltage end wiring board 2, and the output terminal wiring board 3 is connected to the support rod 6 between the low-voltage end wiring board 1 and the high-voltage end wiring board 2 in a sliding manner; the push-pull mechanism is arranged between a component consisting of the low-voltage terminal wiring board 1, the high-voltage terminal wiring board 2 and the support rod 6 and the output terminal wiring board 3, the push-pull mechanism moves to enable the output terminal wiring board 3 to move on the support rod 6 between the low-voltage terminal wiring board 1 and the high-voltage terminal wiring board 2, the stroke of the push-pull mechanism is between the low-voltage terminal wiring board 1 and the high-voltage terminal wiring board 2, and the push-pull mechanism is electrically connected with the centralized processing controller unit; a low-voltage end static contact 1-1 is arranged on one side of the low-voltage end wiring board 1 facing the output terminal wiring board 3; a high-voltage end static contact 2-1 is arranged on one side of the high-voltage end wiring board 2 facing the output terminal wiring board 3; one side of the output terminal wiring board 3 facing the low-voltage end wiring board 1 is provided with a low-voltage end moving contact matched with the low-voltage end fixed contact 1-1, and one side of the output terminal wiring board 3 facing the high-voltage end wiring board 2 is provided with a high-voltage end moving contact 3-1 matched with the high-voltage end fixed contact 2-1.
The central processing controller unit controls the push-pull mechanism to stretch so that the output terminal wiring board 3 moves on the support rod 6 between the pressure end wiring board and the high-voltage end wiring board 2, and when high voltage is required to be connected, the push-pull mechanism pushes the output terminal wiring board 3 to the high-voltage end wiring board 2 so that the high-voltage end movable contact 3-1 is contacted with the high-voltage end fixed contact 2-1 to realize switching of a high-voltage power supply; when low voltage is required to be connected, the push-pull mechanism pushes the output terminal wiring board 3 to the low voltage terminal wiring board 1, so that the low voltage terminal movable contact is contacted with the low voltage terminal fixed contact 1-1, and switching of a low voltage power supply is realized. Because the low-voltage terminal wiring board 1 and the high-voltage terminal wiring board 2 are respectively fixed at two ends by the support rod 6, the distance is long, the stray capacitance leakage of the high-voltage terminal wiring board 2 can hardly affect the low-voltage terminal wiring board 1, and the measurement accuracy is ensured.
Specifically, the push-pull mechanism comprises a stepping motor 4 and a screw rod 7; the screw rod 7 is in transmission connection with a rotating shaft of the stepping motor 4, the screw rod 7 is in threaded connection with the output terminal wiring board 3, and the stepping motor 4 is electrically connected with the centralized processing controller unit.
The lead screw 7 is driven by the stepping motor 4, so that the output terminal wiring board 3 can realize a larger stroke under a smaller length, and the terminal wiring board is ensured to be pushed to contact with the high-voltage terminal wiring board 2 and also to contact with the low-voltage terminal wiring board 1.
Further, the device also comprises a reduction box 5; the screw rod 7 is in transmission connection with a rotating shaft of the stepping motor 4 through the reduction box 5.
The reduction box 5 is used for improving the torque of the screw rod 7 and increasing the precision of the moving distance of the output terminal wiring board 3 on the screw rod 7.
Preferably, the support rods 6 comprise 2.
Through 2 bracing pieces 6, the rotation of the rotating shafts of the winding screw rods 7 of the output terminal wiring board 3, the low-voltage end wiring board 1 and the high-voltage end wiring board 2 can be limited, and the alignment precision of the movable contact and the fixed contact is ensured.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (8)
1. An intelligent transformer testing system, comprising:
an industrial control screen;
the centralized processing controller unit is used for managing and controlling the test power supply unit, the measurement and control module unit, the input switching module and the output switching module according to the industrial control screen setting, and is electrically connected with the industrial control screen;
the test power supply unit is used for providing power supply of corresponding parameters during detection and is electrically connected with the centralized processing controller unit;
the measurement and control module unit is used for executing a test task input by the industrial control screen and is electrically connected with the centralized processing controller unit;
the input switching module is used for switching sampling signals of different detection items and corresponding acquisition modules in the test power supply unit, and is electrically connected with the centralized processing controller unit;
and the output switching module is used for controlling the state of the transformer winding in the measurement process, the state comprises pressurization, open circuit, short circuit or grounding, and the output switching module is electrically connected with the centralized processing controller unit.
2. The intelligent transformer testing system of claim 1, wherein the test power supply unit comprises:
the variable-frequency high-voltage power supply is used for providing power for dielectric loss test;
the direct-current high-voltage power supply is used for providing power for the insulation resistance test;
the direct current constant current power supply is used for providing power for direct current resistance and load switch testing;
and the alternating current power supply is used for providing power for the transformation ratio and short-circuit impedance test.
3. The intelligent transformer test system of claim 1, wherein the measurement and control module unit comprises:
the dielectric loss measurement and control module is used for acquiring data required by dielectric loss measurement and control, a 16-bit ad conversion chip is adopted, one input end of the ad conversion chip inputs a variable-frequency high-voltage signal, the other input end of the ad conversion chip inputs a signal of a tested product, two analog quantities are synchronously acquired, and the ad conversion chip is communicated with the industrial control screen through a 485 bus system;
the insulation resistance measurement and control module is used for collecting data required by insulation resistance measurement and control, a 16-bit ad conversion chip is adopted, one input end of the ad conversion chip inputs a direct-current high-voltage signal, the other input end of the ad conversion chip inputs a signal of a tested product, two analog quantities are synchronously collected, and the ad conversion chip is communicated with the industrial control screen through a 485 bus system;
the transformation ratio measurement and control module is used for collecting data required by transformation ratio measurement and control, a 16-bit ad conversion chip is adopted, alternating voltage signals are input into two input channels of the ad conversion chip, and the ad conversion chip is communicated with an industrial control screen through a 485 bus system;
the short-circuit impedance measurement and control module is used for acquiring data required by short-circuit impedance measurement and control, a 16-bit ad conversion chip is adopted, an alternating voltage signal is input to one input end of the ad conversion chip, an alternating current signal is input to the other input end of the ad conversion chip, two analog quantities are synchronously acquired, and the ad conversion chip is communicated with an industrial control screen through a 485 bus system;
the on-load switch measurement and control module is used for collecting data required by on-load switch measurement and control, a 16-bit ad conversion chip is adopted, direct current signals are input to three input ends of the ad conversion chip, and the ad conversion chip is communicated with an industrial control screen through a 485 bus system;
the direct current resistance measurement and control module is used for collecting data required by direct current resistance measurement and control and comprises 6 ad conversion chips and 6 power isolation modules, each ad conversion chip is electrically connected with a direct current constant current power supply through one power isolation module to form an independent power supply system, wherein the 3 ad conversion chips input direct current voltage, the other 3 ad conversion chips input direct current, and the 6 ad conversion chips are communicated with an industrial control screen through a 485 bus system.
4. The intelligent transformer test system according to claim 3, wherein the ad conversion chips for the DC resistance measurement and control module and the insulation resistance measurement and control module are ad7705, and the ad conversion chips for the dielectric loss measurement and control module, the on-load switch measurement and control module and the short-circuit impedance measurement and control module are ad7656.
5. The intelligent transformer test system according to claim 1, wherein the output switching module comprises a low-voltage terminal wiring board (1), a high-voltage terminal wiring board (2), an output terminal wiring board (3), a support rod (6) and a push-pull mechanism;
two ends of the support rod (6) are respectively and fixedly connected with the low-voltage terminal wiring board (1) and the high-voltage terminal wiring board (2), and the output terminal wiring board (3) is connected to the support rod (6) between the low-voltage terminal wiring board (1) and the high-voltage terminal wiring board (2) in a sliding manner;
the push-pull mechanism is arranged between a component consisting of the low-voltage end wiring board (1), the high-voltage end wiring board (2) and the support rod (6) and the output terminal wiring board (3), the push-pull mechanism acts to enable the output terminal wiring board (3) to move on the support rod (6) between the low-voltage end wiring board (1) and the high-voltage end wiring board (2), the stroke of the push-pull mechanism is between the low-voltage end wiring board (1) and the high-voltage end wiring board (2), and the push-pull mechanism is electrically connected with the centralized processing controller unit;
a low-voltage end static contact (1-1) is arranged on one side, facing the output terminal wiring board (3), of the low-voltage end wiring board (1);
a high-voltage end static contact (2-1) is arranged on one side, facing the output terminal wiring board (3), of the high-voltage end wiring board (2);
one side of the output terminal wiring board (3) facing the low-voltage end wiring board (1) is provided with a low-voltage end moving contact matched with the low-voltage end fixed contact (1-1), and one side of the output terminal wiring board (3) facing the high-voltage end wiring board (2) is provided with a high-voltage end moving contact (3-1) matched with the high-voltage end fixed contact (2-1).
6. The intelligent transformer test system according to claim 5, wherein the push-pull mechanism comprises a stepping motor (4) and a lead screw (7);
the screw rod (7) is in transmission connection with a rotating shaft of the stepping motor (4), the screw rod (7) is in threaded connection with the output terminal wiring board (3), and the stepping motor (4) is electrically connected with the centralized processing controller unit.
7. The intelligent transformer testing system of claim 6, further comprising a reduction box (5);
the screw rod (7) is in transmission connection with a rotating shaft of the stepping motor (4) through the reduction gearbox (5).
8. Intelligent transformer testing system according to claim 5, characterized in that the support rods (6) comprise 2.
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| CN202211106944.8A CN115436731A (en) | 2022-09-10 | 2022-09-10 | Intelligent transformer test system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116907789A (en) * | 2023-09-12 | 2023-10-20 | 中国航空工业集团公司沈阳空气动力研究所 | Multi-system synchronous identification method and device based on pressure measurement |
| CN117665463A (en) * | 2023-12-14 | 2024-03-08 | 山东省产品质量检验研究院 | Transformer test system and method |
-
2022
- 2022-09-10 CN CN202211106944.8A patent/CN115436731A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116907789A (en) * | 2023-09-12 | 2023-10-20 | 中国航空工业集团公司沈阳空气动力研究所 | Multi-system synchronous identification method and device based on pressure measurement |
| CN116907789B (en) * | 2023-09-12 | 2023-11-28 | 中国航空工业集团公司沈阳空气动力研究所 | Multi-system synchronous identification method and device based on pressure measurement |
| CN117665463A (en) * | 2023-12-14 | 2024-03-08 | 山东省产品质量检验研究院 | Transformer test system and method |
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