CN219162235U

CN219162235U - Broadband transient high-current detection sensor

Info

Publication number: CN219162235U
Application number: CN202320076855.7U
Authority: CN
Inventors: 王永平; 李安虎; 柴丽丽
Original assignee: Shandong Anlan Electronics Co ltd; Shandong Yuanxing Electronics Co ltd
Current assignee: Shandong Anlan Electronics Co ltd; Shandong Yuanxing Electronics Co ltd
Priority date: 2023-01-09
Filing date: 2023-01-09
Publication date: 2023-06-09
Anticipated expiration: 2033-01-09

Abstract

The utility model relates to the technical field of current collection sensors or current collection transformers, in particular to a broadband transient high-current detection sensor which comprises a Gao Pinluo coil, a low-frequency rogowski coil, a high-pass filter, a low-pass filter and a signal synthesis module. The input ends of the signal synthesis module are respectively and electrically connected with the output ends of the high-pass filter and the low-pass filter, and the signal synthesis module synthesizes the acquired high-frequency signals and the acquired low-frequency signals into acquisition signals with complete frequency spectrums. The utility model can realize the acquisition of broadband high-current signals, so that the acquired signals have complete waveforms in the frequency domain and achieve the effect of no distortion.

Description

Broadband transient high-current detection sensor

Technical Field

The utility model relates to the technical field of current collection sensors or current collection transformers, in particular to a broadband transient high-current detection sensor.

Background

When monitoring wide-frequency large dynamic current waveforms in a power system, a current sensor based on the rogowski coil principle is used. Wherein, broadband large dynamic current such as lightning strike discharge current, short-circuit fault current and the like. The lightning current is generated by the lightning arrester in the process of leading the lightning into the ground, and has the characteristics of large instantaneous amplitude, ultra-wide frequency spectrum and the like. Lightning arresters are very important protective devices in electrical installations, which can protect electrical equipment from lightning strikes or reduce the effects of lightning strikes. After a lightning stroke, the lightning arrester needs to be detected so as to ensure the normal lightning protection function. The lightning stroke current is a judging basis for the detection of the lightning arrester. The short-circuit fault current is a current generated when a short circuit occurs in a line or a device, and also has the above characteristics.

Rogowski coils are commonly used for detecting such large amplitude, wide frequency range currents. At present, although the Rogowski coil does not contain magnetic materials, no saturation phenomenon exists, the measuring range is wide, and the response frequency is wide. However, in actual engineering, there is an unavoidable problem that the frequency response is limited due to the influence of the distribution parameters. The measurement of the high frequency signal is limited when the low frequency is concerned, and the measurement of the low frequency signal is affected when the high frequency signal is concerned. Therefore, the utility model can not ensure that a current signal in a complete frequency domain can be detected without distortion, which is the technical problem to be solved.

Disclosure of Invention

The utility model aims to solve the technical problems that: a sensor capable of detecting a wide-band transient high current is provided.

The technical scheme for solving the technical problems is as follows: the broadband transient high-current detection sensor is characterized by comprising a high-frequency rogowski coil, a low-frequency rogowski coil, a high-pass filter, a low-pass filter and a signal synthesis module. A high-frequency sampling coil is arranged inside the Gao Pinluo coil; the low-frequency rogowski coil is internally provided with a low-frequency sampling coil. The high-pass filter is electrically connected with the output end of the Gao Pinluo coil; the low-pass filter is electrically connected with the output end of the low-frequency rogowski coil; the input ends of the signal synthesis module are respectively electrically connected with the output ends of the high-pass filter and the low-pass filter, and the signal synthesis module synthesizes the collected high-frequency signals and the collected low-frequency signals into the collected signals with complete frequency spectrum.

More preferably, the frequency spectrum range collected by the Gao Pinluo coil is 10 KHz-10 MHz.

More preferably, the frequency spectrum range acquired by the low-frequency rogowski coil is 5 Hz-100 KHz.

More preferably, the high-pass filter is electrically connected with the Gao Pinluo coil through an integrating circuit module or a self-integrating circuit module.

Preferably, the low-pass filter is electrically connected with the low-frequency rogowski coil through an integrating circuit module.

Preferably, the output ends of the high-pass filter and the low-pass filter are respectively connected with the signal synthesis module.

Preferably, the signal synthesis module comprises a capacitor connected with the high-frequency signal input end and the output end, and an inductor connected with the low-frequency signal input end and the output end.

The beneficial effects of the utility model are as follows:

the utility model can realize the acquisition of broadband high-current signals, so that the acquired signals have complete waveforms in the frequency domain and achieve the effect of no distortion.

Drawings

FIG. 1 is a schematic diagram of one embodiment of the present utility model.

Fig. 2 is a schematic diagram of a signal synthesizing module according to the present utility model.

In the figure:

500. an integrating circuit module; 600. an integrating circuit module; 700. a signal synthesis module; 400. a low pass filter; 300. a high pass filter; 200. a low frequency rogowski coil; 100. gao Pinluo's coil;

Detailed Description

In order to make the technical scheme and beneficial effects of the present utility model clearer, the following further explain the embodiments of the present utility model in detail.

The broadband transient high-current detection sensor comprises a Gao Pinluo coil 100, a low-frequency rogowski coil 200, a high-pass filter 300, a low-pass filter 400, an integrating circuit module 500 or an integrating circuit module 600 and a signal synthesis module 700.

The Gao Pinluo-type coil 100 is internally provided with a high-frequency sampling coil for collecting high-frequency signals in high current. The high-frequency sampling coil has fewer turns, small inductance, small turn-to-turn capacitance and high characteristic frequency, and is suitable for measuring high-frequency current. The actual example of the spectral range acquired by Gao Pinluo's coil 100 is 10 KHz-10 MHz. The low-frequency rogowski coil 200 is internally provided with a low-frequency sampling coil, the number of turns of the coil in the low-frequency sampling coil is more, the inductance is large, the turn-to-turn capacitance is large, the characteristic frequency is low, and the low-frequency rogowski coil is suitable for measuring low-frequency current. The actual example of the spectral range acquired by the low frequency rogowski coil 200 is 5Hz to 100KHz.

In the process of acquiring the current signal by the Gao Pinluo winding 100, the signal at the edge of the high-frequency region is distorted, so the high-pass filter 300 is provided to filter the signal detected by the high-frequency rogowski winding 100, and filter the signal at the edge of the high-frequency region with serious distortion. Similarly, the signals at the edges of the low frequency region in the low frequency domain acquired by the low frequency rogowski coil 200 are distorted, so that the low pass filter 400 is set to filter the signals at the edges of the low frequency region. Wherein the high frequency region edge refers to the edge at the lower frequency end in the frequency band, and the lower region edge refers to the edge at the higher frequency end in the frequency band.

The input ends of the signal synthesis module 700 are respectively electrically connected with the output ends of the high-pass filter 300 and the low-pass filter 400, and the signal synthesis module 700 synthesizes the collected high-frequency signals and the collected low-frequency signals into a collection signal with a complete frequency spectrum. For a complete transient high current, assume its frequency domain is f ₁ Hz～f ₂ Hz. Wherein the detection range of the low-frequency rogowski coil 200 is f ₁₁ ～f ₁₂ Wherein f ₁₁ ＜f ₁ ，f ₁₂ ＞f ₁ ，f ₂₁ ＜f ₂ ，f ₂₂ ＞f ₂ And f ₁₂ ＞f ₂₁ The Gao Pinluo

coils

100, 200 have a frequency domain with coincident detection regions, i.e. the frequency domain has possible distortionAnd filtering the distorted signal through a filter. And, the filtered signals also remain in overlapping range to facilitate the synthesis of a complete signal.

Since the rogowski coil has no magnetic core, the rogowski coil is a hollow annular coil, and the output of the rogowski coil is a voltage signal proportional to the differential of the measured current, the voltage signal is subjected to integral processing to obtain a voltage output signal proportional to the measured current. Therefore, the high pass filter 300 is electrically connected to the Gao Pinluo coil 100 through the integrating circuit module 500. The low-pass filter 400 is also electrically connected to the low-frequency rogowski coil 200 through an integrating circuit module 600.

After the high frequency signal and the low frequency signal are acquired, signal synthesis is performed using the signal synthesis module 700. As shown in fig. 2, signal synthesis of an analog signal of a high frequency signal and an analog signal of a low frequency signal may be implemented using the circuit in fig. 2. That is, the high-frequency signal is connected to the signal output terminal of the signal synthesizing module 700 through a capacitor, and the low-frequency signal is connected to the signal output terminal of the signal synthesizing module 700 through an inductor. The high-frequency signal and the low-frequency signal are firstly converted into digital signals, and a new complete frequency domain signal is formed after the two digital signals are subjected to superposition processing.

In summary, the above description is only a preferred embodiment of the present utility model, and is not intended to limit the scope of the present utility model, and the related workers can make various changes and modifications without departing from the scope of the technical idea of the present utility model. The technical scope of the present utility model is not limited to the description, but includes all equivalent changes and modifications in shape, construction, characteristics and spirit according to the scope of the claims.

Claims

1. The broadband transient high-current detection sensor is characterized in that:

comprising the following steps:

gao Pinluo, a high-frequency sampling coil is arranged inside the coil (100);

a low-frequency rogowski coil (200) with a low-frequency sampling coil inside;

a high-pass filter (300) electrically connected to the output end of the Gao Pinluo coil (100);

a low-pass filter (400) electrically connected to the output end of the low-frequency rogowski coil (200);

the input ends of the signal synthesis module (700) are respectively electrically connected with the output ends of the high-pass filter (300) and the low-pass filter (400), and the signal synthesis module (700) synthesizes the collected high-frequency signals and the collected low-frequency signals into the collected signals with complete frequency spectrums.

2. The broadband transient high current detection sensor of claim 1, wherein:

the frequency spectrum range collected by the Gao Pinluo coil (100) is 10 KHz-10 MHz.

3. The broadband transient high current detection sensor of claim 1, wherein:

the frequency spectrum range collected by the low-frequency rogowski coil (200) is 5 Hz-100 KHz.

4. The broadband transient high current detection sensor of claim 1, wherein:

the high-pass filter (300) is electrically connected with the Gao Pinluo coil (100) through an integrating circuit module or a self-integrating circuit module (500).

5. The broadband transient high current detection sensor of claim 1, wherein:

the low-pass filter (400) is electrically connected with the low-frequency rogowski coil (200) through an integrating circuit module (500).

6. The broadband transient high current detection sensor of claim 1, wherein:

and the output ends of the high-pass filter (300) and the low-pass filter (400) are respectively connected with the signal synthesis module (700).

7. The broadband transient high current detection sensor of claim 1, wherein:

the signal synthesis module (700) comprises a capacitor connected with the high-frequency signal input end and the output end, and an inductor connected with the low-frequency signal input end and the output end.