CN206248818U - A kind of DC voltage transformer frequency response detection means - Google Patents

Abstract

The utility model provides a frequency response detection device for a DC voltage transformer, which includes a standard voltage acquisition circuit, a calibrated voltage acquisition circuit, a waveform generation circuit, a waveform matching circuit, a frequency response detection circuit, a clock synchronization circuit, and a standard voltage acquisition circuit. The output voltage of the standard mainstream voltage divider is collected, and the output voltage of the calibrated DC voltage transformer is collected by the calibrated voltage acquisition circuit. The waveform generation circuit and the frequency response detection circuit receive the timing signal sent by the clock synchronization circuit to make the acquisition The calibrated voltage corresponds to the standard voltage collected at the same time as the calibrated voltage, and then the error of the frequency response of the calibrated voltage and the matching waveform of the calibrated voltage and the standard voltage are respectively obtained. The staff can fully understand the frequency response characteristics of the calibrated DC voltage transformer through the waveform and frequency response error.

Description

A frequency response detection device for a DC voltage transformer

technical field

The utility model relates to the technical field of transformer detection, in particular to a frequency response detection device for a DC voltage transformer.

Background technique

Compared with alternating current, direct current transmission has more advantages in high-power ultra-high voltage long-distance transmission, cable transmission, and asynchronous networking. As a measuring device for pole line voltage, direct current voltage transformer is an indispensable equipment in direct current transmission . DC voltage transformers are generally divided into electronic DC voltage transformers based on the principle of resistance voltage division and all-fiber DC voltage transformers.

DC voltage transformers are generally installed at high-voltage DC pole lines, neutral busbars and grounding pole lines in converter stations, and they are used as secondary access signals for DC system control and protection. After the DC voltage transformer is installed on site, it is generally only tested for its DC voltage measurement accuracy. However, the detection and research on the frequency response of the DC voltage transformer is not yet in-depth.

Utility model content

The purpose of the utility model is to provide a frequency response detection device of a DC voltage transformer to detect the frequency response of the DC voltage transformer.

A DC voltage transformer frequency response detection device includes: a standard voltage acquisition circuit, a calibrated voltage acquisition circuit, a waveform generation circuit, a waveform matching circuit, a frequency response detection circuit and a clock synchronization circuit;

The input end of the waveform generation circuit is respectively connected with the output end of the standard voltage acquisition circuit and the output end of the voltage acquisition circuit to be calibrated;

The input end of the frequency response detection circuit is respectively connected with the output end of the standard voltage acquisition circuit and the output end of the calibrated voltage acquisition circuit;

The output terminal of the waveform generating circuit is electrically connected to the input terminal of the waveform matching circuit;

The clock synchronization circuit is respectively connected with the standard voltage acquisition circuit, the calibrated voltage acquisition circuit, the frequency response detection circuit and the waveform generation circuit.

Further, the frequency response detection circuit includes a voltage amplitude detection circuit and a voltage phase detection circuit;

The voltage amplitude detection circuit is respectively connected with the standard voltage acquisition circuit and the calibrated voltage acquisition circuit;

The voltage phase detection circuit is respectively connected with the standard voltage acquisition circuit and the calibrated voltage acquisition circuit.

Further, the standard voltage acquisition circuit includes a voltage sensor and an A/D converter connected to the voltage sensor.

Further, the DC voltage frequency response detection device further includes a display, and the display is respectively connected to the waveform matching circuit and the frequency response detection circuit.

Further, the calibrated voltage acquisition circuit is a digital signal acquisition circuit.

Further, the voltage sensor is a broadband voltage sensor.

It can be seen from the above technical solutions that the utility model provides a frequency response detection device for a DC voltage transformer, which includes a standard voltage acquisition circuit, a calibrated voltage acquisition circuit, a waveform generation circuit, a waveform matching circuit, a frequency response detection circuit and clock synchronization circuit, the standard voltage collection circuit is connected with the standard DC voltage divider to collect the standard voltage output by the standard DC voltage divider, and the calibrated voltage collection circuit is connected to the calibrated DC voltage transformer to collect the calibrated DC voltage mutual inductance The calibrated voltage output by the device, the standard voltage acquisition circuit and the calibrated voltage acquisition circuit receive the timing signal sent by the clock synchronization circuit. The standard voltage acquisition circuit collects the standard voltage, while the calibrated voltage acquisition circuit collects the calibrated voltage, the waveform generation circuit and the frequency response detection circuit receive the timing signal sent by the clock synchronization circuit, and are used to make the collected calibrated voltage and the calibrated voltage The voltage is matched with the standard voltage collected at the same time, and the error of the frequency response of the calibrated voltage and the matching waveform of the calibrated voltage and the standard voltage are respectively obtained. The staff can fully understand the frequency response characteristics of the calibrated DC voltage transformer through the waveform and frequency response error.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only the present invention. For some embodiments of the present invention, those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts.

Fig. 1 is a schematic circuit diagram of a DC voltage transformer frequency response detection device provided by an embodiment of the present invention;

Fig. 2 is the circuit schematic diagram of the frequency response detection circuit of Fig. 1;

FIG. 3 is a schematic circuit diagram of the standard voltage acquisition circuit in FIG. 1 .

Among them, 101-standard voltage acquisition circuit, 102-voltage acquisition circuit to be calibrated, 103-clock synchronization circuit, 104-frequency response detection circuit, 105-waveform generation circuit, 106-waveform matching circuit, 107-display, 201-voltage amplitude Value detection circuit, 202-voltage phase detection circuit, 301-voltage sensor, 302-A/D transformer.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

The utility model provides a DC voltage transformer frequency response detection device comprising: a standard voltage acquisition circuit 101, a calibrated voltage acquisition circuit 102, a waveform generation circuit 105, a waveform matching circuit 106, a frequency response detection circuit 104 and a clock synchronization circuit 103;

The input end of described waveform generating circuit 105 is respectively connected with the output end of described standard voltage acquisition circuit 101 and the output end of calibrated voltage acquisition circuit 102;

The input end of the frequency response detection circuit 104 is respectively connected with the output end of the standard voltage acquisition circuit 101 and the output end of the calibrated voltage acquisition circuit 102;

The output terminal of the waveform generating circuit 105 is electrically connected to the input terminal of the waveform matching circuit 106;

The clock synchronization circuit 103 is respectively connected to the standard voltage acquisition circuit 101 , the calibrated voltage acquisition circuit 102 , the frequency response detection circuit 104 and the waveform generation circuit 105 .

The waveform generation circuit can use a band-pass filter and a decomposition filter, and the waveform matching circuit can be composed of a matched filter and a processor. The band-pass filter can filter the standard voltage and the voltage to be calibrated, and then decompose it through the decomposition filter. Then the signal processed by the matched filter is sent to the processor for data processing.

It can be seen from the above technical solutions that the utility model provides a frequency response detection device for a DC voltage transformer, which includes a standard voltage acquisition circuit 101, a calibrated voltage acquisition circuit 102, a waveform generation circuit 105, a waveform matching circuit 106, and a frequency response detection device. Circuit 104 and clock synchronization circuit 103, standard voltage acquisition circuit 101 is connected with standard DC voltage divider, to collect the standard voltage of the output of standard DC voltage divider, the voltage acquisition circuit 102 to be calibrated is connected with the DC voltage transformer to be calibrated , to collect the calibrated voltage output by the calibrated DC voltage transformer, the standard voltage acquisition circuit 101 and the calibrated voltage acquisition circuit 102 receive the timing signal sent by the clock synchronization circuit 103 . The standard voltage acquisition circuit 101 collects the standard voltage, while the calibrated voltage acquisition circuit 102 collects the calibrated voltage, the waveform generation circuit 105 and the frequency response detection circuit receive the timing signal sent by the clock synchronization circuit 103, and are used to make the collected calibrated voltage and Corresponding to the standard voltage collected at the same time as the calibrated voltage, then the error of the frequency response of the calibrated voltage and the matching waveform of the calibrated voltage and the standard voltage are respectively obtained. The staff can fully understand the frequency response characteristics of the calibrated DC voltage transformer through the waveform and frequency response error.

Further, the frequency response detection circuit 104 includes a voltage amplitude detection circuit 201 and a voltage phase detection circuit 202;

The voltage amplitude detection circuit 201 is respectively connected with the standard voltage acquisition circuit 101 and the calibrated voltage acquisition circuit 102;

The voltage phase detection circuit 202 is connected to the standard voltage acquisition circuit 101 and the calibrated voltage acquisition circuit 102 respectively.

The detection of the frequency response of the DC voltage transformer includes the detection of the voltage amplitude and the detection of the voltage phase. The detection of the voltage amplitude obtains the amplitude error of the calibrated voltage by detecting the amplitude of the standard voltage and the amplitude of the calibrated voltage; The phase detection circuit 202 obtains the phase error of the voltage to be calibrated by detecting the phase of the standard voltage and the phase of the voltage to be calibrated. Through the amplitude error and phase error of the voltage being calibrated, the staff can understand the frequency response characteristics of the DC voltage transformer being calibrated.

Further, the standard voltage acquisition circuit 101 includes a voltage sensor 301 and an A/D converter 302 connected to the voltage sensor 301 .

Since the output voltage signal of the standard DC voltage divider is usually an analog voltage signal, in order to detect and analyze the output voltage signal, the output voltage signal of the standard DC voltage divider needs to be converted into a digital signal by the A/D converter 302 . Furthermore, the voltage sensor 3017 can convert the analog voltage signal into a small voltage signal to ensure the accuracy of the voltage signal of the standard voltage divider.

Further, the DC voltage frequency response detection device further includes a display 107, and the display 107 is respectively connected to the waveform matching circuit 106 and the frequency response detection circuit 104.

The display 107 can display the matched waveforms of the standard voltage and the calibrated voltage, as well as the error value of the frequency response of the calibrated voltage, so that the staff can more intuitively understand the frequency response characteristics of the calibrated DC voltage transformer.

Further, the calibrated voltage acquisition circuit 102 is a digital signal acquisition circuit.

The output voltage signal of the DC voltage transformer is usually a digital signal, so the calibrated voltage acquisition circuit 102 is a digital signal acquisition circuit.

Further, the voltage sensor 301 is a broadband voltage sensor.

Since the output voltage of the standard DC voltage divider has a wide frequency range, the wide frequency voltage sensor 301 can be used to collect the complete frequency range of the standard DC voltage divider, making the detection result more accurate.

It can be seen from the above technical solutions that the utility model provides a frequency response detection device for a DC voltage transformer, which includes a standard voltage acquisition circuit 101, a calibrated voltage acquisition circuit 102, a waveform generation circuit 105, a frequency response detection circuit 104 and a clock synchronization Circuit 103, the standard voltage collection circuit 101 is connected with the standard DC voltage divider to collect the output standard voltage of the standard DC voltage divider, the calibrated voltage collection circuit 102 is connected with the calibrated DC voltage transformer to collect the calibrated The calibrated voltage output by the DC voltage transformer, the standard voltage acquisition circuit 101 and the calibrated voltage acquisition circuit 102 receive the timing signal sent by the clock synchronization circuit 103 . The standard voltage acquisition circuit 101 collects the standard voltage, while the calibrated voltage acquisition circuit 102 collects the calibrated voltage, the waveform generation circuit 105 and the frequency response detection circuit receive the timing signal sent by the clock synchronization circuit 103, and are used to make the collected calibrated voltage and Corresponding to the standard voltage collected at the same time as the calibrated voltage, then the error of the frequency response of the calibrated voltage and the matching waveform of the calibrated voltage and the standard voltage are respectively obtained. The staff can fully understand the frequency response characteristics of the calibrated DC voltage transformer through the waveform and frequency response error.

Other embodiments of the invention will be readily apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the utility model, which follows the general principles of the utility model and includes common knowledge or common knowledge in the technical field not disclosed by the utility model. conventional technical means. The specification and examples are to be considered exemplary only, with a true scope and spirit of the invention indicated by the following claims.

It should be understood that the present invention is not limited to the precise structure which has been described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (6)

1. a kind of DC voltage transformer frequency response detection means, it is characterised in that the DC voltage transformer frequency is rung Answering detection means includes：Normal voltage Acquisition Circuit (101), by school voltage collection circuit (102), waveform generating circuit (105), Waveform Matching circuit (106), frequency response detect circuit (104) and clock synchronization circuit (103)；

The input of the waveform generating circuit (105) respectively with the output end and quilt of the normal voltage Acquisition Circuit (101) The output end connection of school voltage collection circuit (102)；

The input of frequency response detection circuit (104) respectively with the output end of the normal voltage Acquisition Circuit (101) Connected with by the output end of school voltage collection circuit (102)；

The output end of the waveform generating circuit (105) is electrically connected with the input of the Waveform Matching circuit (106)；

The clock synchronization circuit (103) respectively with the normal voltage Acquisition Circuit (101), by school voltage collection circuit (102), frequency response detects circuit (104) and waveform generating circuit (105) connection.

2. DC voltage transformer frequency response detection means according to claim 1, it is characterised in that the frequency is rung Should detect that circuit (104) detects that circuit (201) and voltage-phase detect circuit (202) including voltage magnitude；

The voltage magnitude detects circuit (201) respectively with the normal voltage Acquisition Circuit (101) and by school voltage acquisition electricity Road (102) connects；

The voltage-phase detects circuit (202) respectively with the normal voltage Acquisition Circuit (101) and by school voltage acquisition electricity Road (102) connects.

3. DC voltage transformer frequency response detection means according to claim 1, it is characterised in that the standard electric The A/D converter (302) that pressure Acquisition Circuit (101) is connected including voltage sensor (301) and with voltage sensor (301).

4. DC voltage transformer frequency response detection means according to claim 3, it is characterised in that the direct current Voltage-frequency rate response detection device also include display (107), the display (107) respectively with Waveform Matching circuit (105) and Frequency response detects circuit (104) connection.

5. DC voltage transformer frequency response detection means according to claim 4, it is characterised in that described by school electricity Pressure Acquisition Circuit (102) is digital signal acquiring circuit.

6. DC voltage transformer frequency response detection means according to claim 5, it is characterised in that the voltage is passed Sensor (301) is wideband voltage sensor.