CN218350484U - Full-range voltage transformer calibrator control system - Google Patents

Abstract

The utility model provides a full-range voltage transformer calibrator control system, which belongs to the technical field of testing instruments and meters, wherein the control system comprises an acquisition unit, a processing unit and a display unit, the acquisition unit comprises a signal acquisition module, the processing unit comprises a singlechip controller, a simulation debugging module, a filtering module and a transformer difference comparison module, and the display unit comprises a nixie tube display module; the signal acquisition module, the simulation debugging module, the filtering module, the mutual inductor difference value comparison module and the nixie tube display module are respectively connected with the single chip microcomputer controller. The utility model discloses control system is used for voltage transformer's error test, can use the standard voltage transformer of single transformation ratio, measures the mutual-inductor of various transformation ratios, including nonstandard transformation ratio voltage transformer, have good examination stability, accuracy and reliability.

Description

Full-range voltage transformer calibrator control system

Technical Field

The utility model belongs to the technical field of test instrument and meter, concretely relates to full-range voltage transformer calibrator control system.

Background

In an electric power system, a voltage transformer is used to transform a voltage, similar to a transformer. The purpose of voltage transformation of the transformer is to conveniently transmit electric energy, so that the capacity is large; the voltage transformer is mainly used for supplying power to a measuring instrument and a relay protection device, measuring the voltage, the power and the electric energy of a line, or protecting valuable equipment, a motor and a transformer in the line when the line fails, so that the capacity of the voltage transformer is small.

The basic structure of a voltage transformer is similar to that of a transformer, which also has two windings, a primary winding and a secondary winding. Both windings are mounted or wound on the core. Insulation is arranged between the two windings and between the windings and the iron core, so that electrical isolation is arranged between the two windings and between the windings and the iron core. When the voltage transformer operates, the primary winding is connected on the line in parallel, and the secondary winding is connected with an instrument or a relay in parallel. Therefore, when measuring the voltage on the high-voltage line, although the primary voltage is high, the secondary voltage is low, and the safety of operators and instruments can be ensured.

Because the voltage transformer needs to provide reliable and accurate signals for metering protection and monitoring, and the performance of the voltage transformer is related to the reliable operation of the whole power transmission system, the voltage transformer needs to be verified in the production, use or maintenance of the voltage transformer. Therefore, various voltage transformer check meters appear on the market, but in practical application, the phenomenon of serious deviation between a laboratory and a field check can often appear, and different check meter check results can also appear in practical application, so that a checker needs to repeatedly measure for many times to ensure the accuracy of the check results.

SUMMERY OF THE UTILITY MODEL

In order to further improve examination stability, accuracy and reliability etc. of voltage transformer check gauge, the utility model provides a full-scale voltage transformer check gauge control system for voltage transformer's error test can use the standard voltage transformer of single transformation ratio, measures the mutual-inductor of various transformation ratios, including nonstandard transformation ratio voltage transformer, has good examination stability, accuracy and reliability. The specific technical scheme is as follows:

a full-range voltage transformer calibrator control system comprises an acquisition unit, a processing unit and a display unit, wherein the acquisition unit comprises a signal acquisition module 6, the processing unit comprises a single-chip microcomputer controller 1, a simulation debugging module 2, a filtering module 4 and a transformer difference comparison module 8, and the display unit comprises a nixie tube display module 7; the signal acquisition module 6, the simulation debugging module 2, the filtering module 4, the mutual inductor difference comparison module 8 and the nixie tube display module 7 are respectively connected with the singlechip controller 1; the transformer difference value comparison module 8 is connected with a standard voltage divider 9 and a detected voltage divider 10; the standard voltage divider 9 is provided with a mutual inductor which is connected with a switch, and the output voltage is switched through the switch; the transformer difference comparison module 8 obtains difference signals from the standard voltage divider 9 and the detected voltage divider 10, and the difference signals are subjected to proportional amplification through the filtering module 4, so that the data in the whole linear range are stable and reliable;

the circuit of the signal acquisition module 6 comprises 3A/D conversion chips ICL7135, a reference voltage source, schmitt triggers CD40106, resistors and capacitors, wherein each A/D conversion chip ICL7135 is connected with the Schmitt trigger CD40106, the resistors and the capacitors, and the reference of 1A/D conversion chip ICL7135 is provided by the reference voltage source; and the signal acquisition module 6 is used for acquiring signals and transmitting the signals to the singlechip controller 1.

In the above technical solution, the control system further includes a power supply unit, the power supply unit includes a power module 3, and the power module 3 is connected to the single chip microcomputer controller 1.

In the above technical solution, the control system further includes a communication unit, the communication unit includes a communication module 5, and the communication module 5 is connected to the one-chip microcomputer controller 1.

In the above technical solution, the single chip microcomputer controller 1 includes an ATmega16 single chip microcomputer and a clock oscillator, and the ATmega16 single chip microcomputer is connected to the clock oscillator.

In the above technical solution, the connection is an electrical connection, and the electrical connection is a wired connection or a wireless connection.

The working principle of the system is as follows: after the standard transformer and the detected transformer terminal are connected, a corresponding strain ratio is selected through a switch, a difference signal and a standard signal of the standard voltage divider and the detected voltage divider are simultaneously transmitted into a transformer difference comparison circuit, after the difference signal and the standard signal are subjected to multiple filtering circuits and proportional amplification, three groups of data including percentage, ratio difference and angular difference are respectively taken out and transmitted to a signal acquisition module for acquisition, then the data are transmitted to a single chip microcomputer control module for processing and are transmitted to a nixie tube display module for display, and meanwhile, the data are transmitted to an upper computer through a communication module.

The utility model discloses a full range voltage transformer calibrator control system compares with prior art, and beneficial effect is:

1. the utility model discloses the system is used for voltage transformer's error test, can use the standard voltage transformer of single transformation ratio, measures the mutual-inductor of various transformation ratios, including nonstandard transformation ratio voltage transformer.

2. The system is provided with a communication module, an instrument can be connected with a computer for use through the communication module, under the on-line state, the instrument system transmits all measured data to the computer in real time, and a user can acquire and process data through upper computer software, so that the system is convenient and fast, and the data are accurate.

3. The utility model discloses the standard voltage divider of system is provided with mutual-inductor and switch, switches over certain proportion value that output voltage equals input voltage through the switch, has the advantage that the voltage proportion is accurate, stable and give arbitrary proportion. In addition, the device has the characteristics of high input impedance and low output impedance, and provides important performance for accurate electrical measurement.

4. The utility model discloses the examined voltage divider of system is provided with high accuracy mutual-inductor and switch, switches over through the switch and can measure multiple rated secondary voltage's the mutual-inductor that is surveyed, and operation and test data show directly perceived.

5. The utility model discloses the system utilizes mutual-inductor difference comparison module to get the difference signal with standard voltage divider and examined the voltage divider, through multiple filter circuit, the proportion enlargies the back, whole linear range's data is reliable and stable, then with the ratio of standard voltage divider voltage, take out percentage, than poor and angle difference three group data respectively, the transmission is gathered for signal acquisition module, the retransmission is handled and is shown for single chip microcomputer control module, the detection data accuracy and reliability have been guaranteed, it is little to reach the error, the reliability is higher.

6. The utility model discloses the single chip microcomputer controller module of system comprises ATmega16 singlechip and clock oscillator, has advantages such as small, the function is strong, the price is low.

7. The singlechip controller is used as a core, receives data processing data and sends the data to the nixie tube for display; the simulation debugging module provides convenience for the debugging process; the power supply module provides voltage for the whole circuit; the filtering module enables the waveform of the transmission signal to be smooth and stable; the communication module receives the command of the upper computer and transmits back the test data; the signal acquisition module acquires and transmits data of the difference comparison circuit to the single chip microcomputer; the nixie tube display module displays and processes the data processed by the singlechip; the transformer difference comparison module is used for respectively extracting three groups of data of percentage, ratio difference and angle difference from the ratio of the difference signals of the standard voltage divider and the detected voltage divider to the voltage of the standard voltage divider and transmitting the data to the signal acquisition module; the standard voltage divider outputs the transformation ratio required by the measurement and is used as a reference source for the measurement; the detected voltage divider selects corresponding rated voltage according to the detected mutual inductor, so that the calculation is simple and convenient, and the data is visual.

Drawings

Fig. 1 is the utility model relates to a full-scale voltage transformer calibrator control system's schematic diagram, wherein: the method comprises the following steps of 1-a single chip microcomputer controller, 2-a simulation debugging module, 3-a power supply module, 4-a filtering module, 5-a communication module, 6-a signal acquisition module, 7-a nixie tube display module, 8-a mutual inductor difference value comparison module, 9-a standard voltage divider and 10-a detected voltage divider.

Fig. 2 is the utility model relates to a full-scale range voltage transformer calibrator control system's single chip microcomputer controller circuit diagram.

Fig. 3 is the utility model relates to a full-scale voltage transformer calibrator control system's emulation debugging module circuit diagram.

Fig. 4 is the utility model relates to a full-scale voltage transformer calibrator control system's power module circuit diagram.

Fig. 5 is the utility model discloses a full-scale range voltage transformer calibrator control system's filter module circuit diagram.

Fig. 6 is the utility model relates to a full-scale voltage transformer calibrator control system's communication module circuit diagram.

Fig. 7 is the utility model relates to a full-scale voltage transformer calibrator control system's signal acquisition module circuit diagram.

Fig. 8 is the utility model relates to a full-scale voltage transformer calibrator control system's charactron shows circuit diagram.

Fig. 9 is an enlarged view of the position (a) in fig. 8.

Fig. 10 is an enlarged view of the position (b) in fig. 8.

Fig. 11 is an enlarged view of the position (c) in fig. 8.

Fig. 12 is the utility model relates to a full-scale voltage transformer check gauge control system's mutual-inductor difference comparison module connects standard voltage divider and is examined the circuit diagram of voltage divider.

Fig. 13 is an enlarged view of a portion of the transformer difference comparison module of fig. 12.

Fig. 14 is an enlarged view of the standard voltage divider portion of fig. 12.

FIG. 15 is an enlarged view of a portion of the voltage divider of FIG. 12.

Detailed Description

The present invention will be further described with reference to the following detailed description and accompanying fig. 1-15, but the present invention is not limited to these embodiments.

Example 1

A full-range voltage transformer calibrator control system is disclosed, as shown in figures 1-15, and comprises an acquisition unit, a processing unit and a display unit, wherein the acquisition unit comprises a signal acquisition module 6, the processing unit comprises a single chip microcomputer controller 1, a simulation debugging module 2, a filtering module 4 and a transformer difference comparison module 8, and the display unit comprises a nixie tube display module 7. The signal acquisition module 6, the simulation debugging module 2, the filtering module 4, the mutual inductor difference comparison module 8 and the nixie tube display module 7 are respectively connected with the single-chip microcomputer controller 1. The transformer difference comparison module 8 is connected with a standard voltage divider 9 and a detected voltage divider 10. The single chip microcomputer controller 1 comprises an ATmega16 single chip microcomputer and a clock oscillator, and the ATmega16 single chip microcomputer is connected with the clock oscillator. The standard voltage divider 9 is provided with a mutual inductor, the mutual inductor is connected with a switch, and output voltage is switched through the switch. The tested voltage divider 10 is provided with a mutual inductor which is connected with a switch, and the switch is used for switching rated secondary voltage. The transformer difference comparison module 8 obtains difference signals from the standard voltage divider 9 and the detected voltage divider 10, and the difference signals are subjected to proportional amplification through the filtering module 4, so that the data in the whole linear range are stable and reliable. The circuit of the signal acquisition module 6 comprises 3A/D conversion chips ICL7135, a reference voltage source, a Schmitt trigger CD40106, resistors and capacitors, wherein each A/D conversion chip ICL7135 is connected with the Schmitt trigger CD40106, the resistors and the capacitors, and the reference of 1A/D conversion chip ICL7135 is provided by the reference voltage source; and the signal acquisition module 6 is used for acquiring signals and transmitting the signals to the singlechip controller 1.

The control system also comprises a power supply unit and a communication unit, wherein the power supply unit comprises a power module 3, and the power module 3 is connected with the single-chip microcomputer controller 1; the communication unit comprises a communication module 5, and the communication module 5 is connected with the singlechip controller 1.

The working principle of the system is as follows: after the standard transformer and the detected transformer terminal are connected, a corresponding strain ratio is selected through a switch, a difference signal and a standard signal which are obtained by the standard voltage divider and the detected voltage divider are simultaneously transmitted into a transformer difference comparison circuit, after the difference signal and the standard signal are subjected to multiple filtering circuits and are amplified in proportion, three groups of data including percentage, ratio difference and angle difference are respectively taken out and transmitted to a signal acquisition module for acquisition, then the data are transmitted to a singlechip control module for processing and are transmitted to a nixie tube display module for display, and meanwhile, the data are transmitted to an upper computer through a communication module.

The single chip microcomputer controller of the system of the embodiment is used as a core, receives data processing data and sends the data to the nixie tube for display; the simulation debugging module provides convenience for the debugging process; the power supply module provides voltage for the whole circuit; the filtering module enables the waveform of the transmission signal to be smooth and stable; the communication module receives the command of the upper computer and transmits back the test data; the signal acquisition module acquires and transmits data of the difference comparison circuit to the single chip microcomputer; the nixie tube display module displays and processes data processed by the singlechip; the transformer difference comparison module is used for respectively extracting three groups of data of percentage, ratio difference and angle difference from the ratio of the difference signals of the standard voltage divider and the detected voltage divider to the voltage of the standard voltage divider and transmitting the data to the signal acquisition module; the standard voltage divider outputs the transformation ratio required by the measurement and serves as a reference source for the measurement; the corresponding rated voltage is selected by the detected voltage divider according to the detected mutual inductor, the calculation is simple and convenient, and the data is visual.

The control system of the embodiment is used for error testing of the voltage transformer, particularly for controlling the SZPT-3T full-range voltage transformer calibrator, and can use a standard voltage transformer with a single transformation ratio to measure transformers with various transformation ratios, including non-standard transformation ratio voltage transformers.

Wherein, standard mutual-inductor secondary voltage: the voltage of the water is 100V,

secondary voltage of the tested transformer: 230V,220V, 200V,150V,120V,115V,110V,100V,

110/3V, 100/3V; standard voltage divider has 6 plates: 1 V.times.3, 0.1V.times.10, 0.01V.times.10, 0.001V.times.10, 0.0001V.times.10, 0.00001V.times.10; error measurement range: the ratio difference f: less than or equal to 10.000 percent, angle difference delta: less than or equal to 199.9 minutes. The instrument control system introduces loads to the standard mutual inductor and the tested mutual inductor: less than or equal to 0.05VA. Standard inductive divider accuracy: less than or equal to 0.01 percent. Measurement error accuracy: ratio error (relative to full scale): less than or equal to +/-2%, and phase error: less than or equal to +/-2 percent. The system use conditions are as follows: a power supply: commercial power 220V plus or minus 10 percent; the temperature of the use environment: 10-40 ℃; humidity: less than or equal to 80 percent; test signal frequency: 50-60 Hz.

In the testing process, whether the instrument works normally can be judged, the set value of the standard voltage divider stepping plate is increased by 1%, the corresponding specific difference is changed to be 1% in the negative direction, the angular difference is not changed, and the data are confirmed to be actually measured data.

Example (c): if the 1V × 3 disc is set to 1 and the difference table shows that the value is 0.000%, the set value of the 0.01V × 10 step disc is increased by 1, and the display value is increased by 1%, i.e., 1.000%; the 0.001V × 10 step dial setting is increased by 1 and the displayed value is increased by 0.1%, i.e., displayed by 0.100%. And so on.

According to the system-controlled full-range voltage transformer calibrator, the tested voltage divider of the system is provided with the high-precision transformer and the switch, the tested transformers capable of measuring various rated secondary voltages can be switched by the switch, and operation and test data display are visual. The system utilizes a transformer difference comparison module to obtain difference signals of a standard voltage divider and a detected voltage divider, the difference signals pass through a multiple filter circuit and are amplified in proportion, data in the whole linear range are stable and reliable, then three groups of data including percentage, ratio difference and angular difference are respectively taken out according to the ratio of the difference signals to the voltage of the standard voltage divider, the data are transmitted to a signal acquisition module to be acquired, and then the data are transmitted to a single chip microcomputer control module to be processed and displayed, so that the accuracy and the reliability of detected data are guaranteed, the error is small, and the reliability is high.

Claims (4)

1. A full-range voltage transformer calibrator control system comprises an acquisition unit, a processing unit and a display unit, and is characterized in that the acquisition unit comprises a signal acquisition module (6), the processing unit comprises a single-chip microcomputer controller (1), a simulation debugging module (2), a filtering module (4) and a transformer difference comparison module (8), and the display unit comprises a nixie tube display module (7); the signal acquisition module (6), the simulation debugging module (2), the filtering module (4), the mutual inductor difference comparison module (8) and the nixie tube display module (7) are respectively connected with the single chip microcomputer controller (1);

the transformer difference value comparison module (8) is connected with a standard voltage divider (9) and a detected voltage divider (10); the standard voltage divider (9) is provided with a mutual inductor, the mutual inductor is connected with a switch, and output voltage is switched through the switch; the detected voltage divider (10) is provided with a mutual inductor which is connected with a switch, and the switch is used for switching rated secondary voltage; the transformer difference comparison module (8) obtains difference signals of the standard voltage divider (9) and the detected voltage divider (10), and the difference signals are amplified in proportion through the filtering module (4), so that the data in the whole linear range are stable and reliable;

the circuit of the signal acquisition module (6) comprises 3A/D conversion chips ICL7135, reference voltage sources, schmitt triggers CD40106, resistors and capacitors, wherein each A/D conversion chip ICL7135 is connected with the Schmitt trigger CD40106, the resistors and the capacitors, and the reference of 1A/D conversion chip ICL7135 is provided by the reference voltage sources; the signal acquisition module (6) is used for acquiring signals and transmitting the signals to the single chip microcomputer controller (1).

2. The full-range voltage transformer calibrator control system according to claim 1, wherein the control system further comprises a power supply unit, the power supply unit comprises a power supply module (3), and the power supply module (3) is connected with the single-chip microcomputer controller (1).

3. The full-range voltage transformer calibrator control system according to claim 1, wherein the control system further comprises a communication unit, the communication unit comprises a communication module (5), and the communication module (5) is connected with the single-chip microcomputer controller (1).

4. The full-scale voltage transformer calibrator control system according to claim 1, wherein the single-chip microcomputer controller (1) comprises an ATmega16 single-chip microcomputer and a clock oscillator, and the ATmega16 single-chip microcomputer is connected with the clock oscillator.

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