CN211669297U

CN211669297U - Double-channel high-precision voltage transformer

Info

Publication number: CN211669297U
Application number: CN201922343069.5U
Authority: CN
Inventors: 曹恩惠
Original assignee: Qingyan Electrical Wuhan Co ltd
Current assignee: Qingyan Electrical Wuhan Co ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-10-13
Anticipated expiration: 2029-12-23

Abstract

The utility model relates to a high-accuracy voltage transformer of binary channels, include: the system comprises a main control module, an A/D conversion module, a first multiple filtering module, a second multiple filtering module, a first multiple amplification module, a second multiple amplification module, a sampling module, a voltage negative feedback amplification module and a filtering module, wherein the A/D conversion module and the filtering module are connected with the main control module, the first multiple amplification module and the second multiple amplification module are connected with the A/D conversion module, the first multiple filtering module and the second multiple filtering module are respectively connected with the first multiple amplification module and the second multiple amplification module, the voltage negative feedback amplification module is connected with the filtering module, the sampling module is connected with a multistage voltage negative feedback amplification module, and the A/D conversion module is a high-precision A/D conversion module with a double A/D framework. The utility model discloses a binary channels high accuracy voltage transformer has high measuring accuracy, realizes simultaneously that it is experimental to duplex winding voltage transformer combined error.

Description

Double-channel high-precision voltage transformer

Technical Field

The utility model belongs to the check out test set field especially relates to a binary channels high accuracy voltage transformer.

Background

The electronic transformer is a decisive device for building a digital transformer substation and plays a vital role. Electronic mutual inductor products are released by a plurality of manufacturers at home and abroad, and the electronic mutual inductors in the market have various types and are also irregular in product quality.

At present, a mutual inductor calibrator in the market can only test one path of errors of a voltage mutual inductor basically, or carry out three-phase error test aiming at low levels of errors of an electric three-phase voltage mutual inductor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the above-mentioned current situation, provide a binary channels high accuracy voltage transformer.

The utility model adopts the technical proposal that: a dual channel high precision voltage transformer comprising: the display terminal, the A/D conversion module and the filtering module are connected with the main control module, the first multiple amplification module and the second multiple amplification module are connected with the A/D conversion module, the first multiple filtering module and the second multiple filtering module are respectively connected with the first multiple amplification module and the second multiple amplification module, the voltage negative feedback amplification module is connected with the filtering module, the sampling module is connected with the multistage voltage negative feedback amplification module, and the A/D conversion module is a high-precision A/D conversion module with a double A/D framework, the double A/D frameworks of the A/D conversion module are mutually independent, and are respectively connected with the first multiple amplification module and the second multiple amplification module.

The utility model has the effects that: a binary channels high accuracy voltage transformer, adopt two differential pressure passageways and have two AD frameworks AD conversion module can carry out the error experiment data analysis of combination simultaneously to two winding voltage sensors for carrying out data sampling analysis and processing, has high measuring accuracy, realizes the experiment to two winding voltage transformer combined error simultaneously.

Drawings

Fig. 1 is a schematic diagram of a dual-channel high-precision voltage transformer according to the present invention;

FIG. 2 is a circuit block diagram of a sampling module;

fig. 3 is a circuit diagram of the first multiple filtering module and the first multiple amplifying module.

Detailed Description

The utility model provides a high-accuracy voltage transformer of binary channels is introduced below in combination with the figure:

referring to fig. 1, for the present invention, a dual-channel high-precision voltage transformer includes: a main control module 1, a display terminal 2, an A/D conversion module 3, a first multiple filtering module 4, a second multiple filtering module 5, a first multiple amplifying module 6, a second multiple amplifying module 7, a sampling module 8, a voltage negative feedback amplifying module 9 and a filtering module 10, the display terminal 2, the A/D conversion module 3 and the filtering module 10 are connected with the main control module 1, the first multiple amplifying module 6 and the second multiple amplifying module 7 are connected with the A/D conversion module 3, the first multiple filtering module 4 and the second multiple filtering module 5 are respectively connected with the first multiple amplifying module 6 and the second multiple amplifying module 7, the voltage negative feedback amplification module 9 is connected with the filtering module 10, and the sampling module 8 is connected with the multistage voltage negative feedback amplification module 9.

The A/D conversion module 3 is a high-precision A/D conversion module with double A/D frameworks, the double A/D frameworks of the A/D conversion module 3 are mutually independent, and the double A/D frameworks of the A/D conversion module 3 are respectively connected with the first multiple amplification module 6 and the second multiple amplification module 7. The A/D conversion module with high precision and high stability provides basis for the combination of error experiments of the double-winding voltage transformer.

The main control module 1 comprises TMS320F28335 and XC95144 chips.

The display terminal 2 exchanges data with the main control module 1 through a device interface, and the A/D conversion module 3 is connected with the main control module 1 through a flat cable and a shielding wire.

The first multiple filtering module 4 comprises two second-order low-pass active filtering circuits of a CMOS analog multiplexer with the model number of ADG 409.

The second multiple filtering module 5 comprises two second-order low-pass active filtering circuits of a CMOS analog multiplexer with the model number of ADG409, and the circuit structure of the second multiple filtering module 5 is the same as that of the first multiple filtering module 4.

The first multiple amplifying module 6 is a multistage series voltage negative feedback amplifying circuit composed of an ultra-low drift operational amplifier with the model number of AD707, a high-precision module voltage resistor and a capacitor.

The second multiple amplifying module 7 is a multistage series voltage negative feedback amplifying circuit composed of an ultra-low drift operational amplifier with the model number of AD707, a high-precision modular voltage resistor and a capacitor, and the circuit structure of the second multiple amplifying module 7 is the same as that of the first multiple amplifying module 6.

The sampling module 8 comprises two double-path operational amplifiers with the model number of LF353 and a sampling resistor, and the sampling resistor is a high-precision modular voltage resistor.

In this embodiment, the filter further includes a voltage dial indicator channel signal input end 11, a first differential pressure channel 12, and a second differential pressure channel 13, where the voltage dial indicator channel signal input end 11, the first differential pressure channel 12, and the second differential pressure channel 13 are respectively connected to the sampling module 8, the first multiple filtering module 4, and the second multiple filtering module 5.

In this embodiment, a high-stability power module is further provided, and the high-stability power module supplies power to the a/D conversion module 3, the display terminal 2, and the main control module 1, respectively.

A voltage dial indicator channel signal is input from the sampling module 8, passes through the sampling module 8, the voltage negative feedback amplification module 9 and the filtering module 10, is processed, calculated and analyzed by the main control module 1, and displays a dial indicator value; the differential pressure signal channel I and the differential pressure channel II are two independent relatively independent channels, errors of the voltage transformer can be measured independently, the two channels are processed by the first multiple filtering module 4 (or the second multiple filtering module 5) respectively, amplified by the first multiple amplifying module 6 (or the second amplifying module 7), then pass through the A/D conversion module 3, finally signals are transmitted to the main control module 1 to be subjected to data calculation, analysis and processing to separate a ratio difference and a phase difference of test currents, and finally the signals are displayed by the display terminal 3.

A binary channels high accuracy voltage transformer, adopt two differential pressure passageways and have two AD frameworks AD conversion module can carry out the error experiment data analysis of combination simultaneously to two winding voltage sensors for carrying out data sampling analysis and processing, has high measuring accuracy, realizes the experiment to two winding voltage transformer combined error simultaneously.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A two-channel high-precision voltage transformer is characterized by comprising: the display terminal, the A/D conversion module and the filtering module are connected with the main control module, the first multiple amplification module and the second multiple amplification module are connected with the A/D conversion module, the first multiple filtering module and the second multiple filtering module are respectively connected with the first multiple amplification module and the second multiple amplification module, the voltage negative feedback amplification module is connected with the filtering module, the sampling module is connected with the voltage negative feedback amplification module, the A/D conversion module is a high-precision A/D conversion module with a double A/D framework, the double A/D frameworks of the A/D conversion module are mutually independent, and are respectively connected with the first multiple amplification module and the second multiple amplification module.

2. The dual-channel high-precision voltage transformer of claim 1, wherein the display terminal performs data exchange with the main control module through a device interface, and the a/D conversion module is connected with the main control module through a flat cable and a shielded cable.

3. The dual-channel high-precision voltage transformer of claim 1, wherein the master control module comprises TMS320F28335 and XC95144 chips.

4. The dual-channel high-precision voltage transformer of claim 1, wherein the first multi-filter module comprises two second-order low-pass active filter circuits of a CMOS analog multiplexer type ADG409, and the second multi-filter module comprises two second-order low-pass active filter circuits of a CMOS analog multiplexer type ADG 409.

5. The dual-channel high-precision voltage transformer of claim 1, wherein the first multiple amplification module is a multistage series voltage negative feedback amplification circuit composed of an ultra-low drift operational amplifier with model number AD707, a high-precision module voltage resistor and a capacitor, and the second multiple amplification module is a multistage series voltage negative feedback amplification circuit composed of an ultra-low drift operational amplifier with model number AD707, a high-precision module voltage resistor and a capacitor.

6. The dual-channel high-precision voltage transformer of claim 1, further comprising a voltage dial indicator channel signal input terminal, a first differential pressure channel and a second differential pressure channel, wherein the voltage dial indicator channel signal input terminal, the first differential pressure channel and the second differential pressure channel are respectively connected to the sampling module, the first multi-filtering module and the second multi-filtering module.

7. The dual-channel high-precision voltage transformer according to claim 1, further comprising a high-stability power module, wherein the high-stability power module supplies power to the a/D conversion module, the display terminal and the main control module respectively.