阅读说明：本技术 一种具有多量程输出的行波罗氏线圈 (Traveling wave Rogowski coil with multi-range output ) 是由 吕世超 于 2020-07-17 设计创作，主要内容包括：本发明公开了一种具有多量程输出的行波罗氏线圈,属于罗氏线圈技术领域,包括：罗氏线圈,用于测量电流信号；积分电路,用于将电流信号积分转换为电压信号；放大电路包括：大量程放大电路,用于放大大量程的电压信号；小量程放大电路,用于放大小量程的电压信号；高通滤波电路,用于对大量程放大电路与小量程放大电路的输出信号进行高通滤波,并分别通过大量程输出端与小量程输出端输出。本发明的有益效果在于：提供一种具有多量程输出的行波罗氏线圈,该罗氏线圈在测量行波电流时,具有两个量程输出：大量程和小量程,既可以用于测量大电流,也可以保证在小电流下的测量精度,降低对现场的施工难度,提高电流的测量精度。(The invention discloses a traveling wave Rogowski coil with multi-range output, which belongs to the technical field of Rogowski coils and comprises the following components: the Rogowski coil is used for measuring a current signal; the integrating circuit is used for integrating and converting the current signal into a voltage signal; the amplifying circuit includes: the wide-range amplifying circuit is used for amplifying a voltage signal with a large range; the small-range amplifying circuit is used for amplifying a small-range voltage signal; and the high-pass filter circuit is used for performing high-pass filtering on output signals of the large-range amplifying circuit and the small-range amplifying circuit and outputting the output signals through the large-range output end and the small-range output end respectively. The invention has the beneficial effects that: the traveling wave Rogowski coil with multi-range output is provided, and when the traveling wave current is measured, the Rogowski coil has two ranges of output: the large-range and small-range measuring device can be used for measuring large current, can also ensure the measurement precision under small current, reduces the construction difficulty on site, and improves the measurement precision of current.)

1. A traveling wave rogowski coil with multi-range output, comprising:

the Rogowski coil is used for measuring a current signal and comprises a first output end and a second output end;

the positive phase input end of the integrating circuit is connected with the first output end, the negative phase input end of the integrating circuit is connected with the second output end, and the integrating circuit is used for integrating and converting the current signal into a voltage signal;

an amplification circuit, the amplification circuit further comprising:

the positive input end of the wide-range amplifying circuit is connected with the output end of the integrating circuit and is used for amplifying the voltage signal with a wide range;

the positive input end of the small-range amplifying circuit is connected with the output end of the integrating circuit and is used for amplifying the voltage signal of a small range;

and the high-pass filter circuit is respectively connected with the output ends of the large-range amplification circuit and the small-range amplification circuit, is used for performing high-pass filtering on output signals of the large-range amplification circuit and the small-range amplification circuit, and respectively outputs the output signals through the large-range output end and the small-range output end.

2. The traveling-wave rogowski coil of claim 1, wherein the integrating circuit comprises:

the positive phase input end of the first operational amplifier is respectively connected with the first output end and a grounding end, and the negative phase input end of the first operational amplifier is connected with the second output end through a first resistor;

the two ends of the second resistor are respectively connected with the inverting input end of the first operational amplifier and the output end of the first operational amplifier;

and two ends of the first capacitor are respectively connected with the inverting input end of the first operational amplifier and the output end of the first operational amplifier.

3. The traveling-wave rogowski coil of claim 2, wherein the wide-range amplification circuit comprises:

the positive phase input end of the second operational amplifier is connected with the output end of the first operational amplifier through a second capacitor, and the negative phase input end of the second operational amplifier is connected with the output end of the second operational amplifier through a fourth resistor;

the two ends of the third resistor are respectively connected with the inverting input end of the second operational amplifier and the grounding end;

and two ends of the fifth resistor are respectively connected with the positive phase input end of the second operational amplifier and the grounding end.

4. The traveling-wave rogowski coil of claim 3, wherein the small-range amplification circuit comprises:

the positive phase input end of the third operational amplifier is connected with the output end of the first operational amplifier through a third capacitor, and the negative phase input end of the third operational amplifier is connected with the output end of the third operational amplifier through a seventh resistor;

the two ends of the sixth resistor are respectively connected with the inverting input end of the third operational amplifier and the grounding end;

and two ends of the eighth resistor are respectively connected with the positive phase input end of the third operational amplifier and the grounding end.

5. The traveling-wave rogowski coil of claim 4, wherein the high-pass filter circuit comprises:

a positive input terminal of the fourth operational amplifier is connected to the ground terminal through an eleventh resistor, and a negative input terminal of the fourth operational amplifier is connected to the output terminal of the fourth operational amplifier;

one end of the fourth capacitor is connected with the output end of the second operational amplifier, and the other end of the fourth capacitor is connected with the positive phase input end of the fourth operational amplifier through a fifth capacitor;

and the tenth resistor is respectively connected with the fifth capacitor and the output end of the fourth operational amplifier.

6. The traveling-wave rogowski coil of claim 5, further comprising a ninth resistor between the small-scale amplification circuit and the high-pass filter circuit, wherein two ends of the ninth resistor are respectively connected to the output end of the third operational amplifier and the fourth capacitor.

7. The traveling-wave Rogowski coil of claim 5, wherein the first operational amplifier, the second operational amplifier, the third operational amplifier and the fourth operational amplifier each comprise a positive supply terminal and a negative supply terminal;

the voltage of the positive power supply end is +5V, and the voltage of the negative power supply end is-5V.

Technical Field

The invention relates to the technical field of Rogowski coils, in particular to a traveling wave Rogowski coil with multi-range output.

Background

The rogowski coil is also called current measuring coil and differential current sensor, and is a ring coil uniformly wound on non-ferromagnetic material. The output signal of the Rogowski coil is the differential of the current to the time, and the input current can be really restored through a circuit for integrating the output voltage signal.

At present, the rogowski coil is widely used for measuring fault current in a power transmission line, but because the current change range of a measured object is large, when the rogowski coil with a single measuring range is used for measurement, the measurement range and the measurement precision are difficult to be considered at the same time. When a large-range Rogowski coil is used for measurement, the measurement precision under low current cannot be ensured; when the small-range Rogowski coil is used for measurement, large current cannot be measured, so that aiming at the problems, a traveling wave Rogowski coil with multi-range output is urgently needed to be designed so as to meet the requirement of practical use.

Disclosure of Invention

In order to solve the technical problem, the invention provides a traveling wave rogowski coil with multi-range output.

The technical problem solved by the invention can be realized by adopting the following technical scheme:

the invention provides a traveling wave Rogowski coil with multi-range output, comprising:

the Rogowski coil is used for measuring a current signal and comprises a first output end and a second output end;

the positive phase input end of the integrating circuit is connected with the first output end, the negative phase input end of the integrating circuit is connected with the second output end, and the integrating circuit is used for integrating and converting the current signal into a voltage signal;

an amplification circuit, the amplification circuit further comprising:

the positive input end of the wide-range amplifying circuit is connected with the output end of the integrating circuit and is used for amplifying the voltage signal with a wide range;

the positive input end of the small-range amplifying circuit is connected with the output end of the integrating circuit and is used for amplifying the voltage signal of a small range;

and the high-pass filter circuit is respectively connected with the output ends of the large-range amplification circuit and the small-range amplification circuit, is used for performing high-pass filtering on output signals of the large-range amplification circuit and the small-range amplification circuit, and respectively outputs the output signals through the large-range output end and the small-range output end.

Preferably, the integration circuit includes:

the positive phase input end of the first operational amplifier is respectively connected with the first output end and a grounding end, and the negative phase input end of the first operational amplifier is connected with the second output end through a first resistor;

the two ends of the second resistor are respectively connected with the inverting input end of the first operational amplifier and the output end of the first operational amplifier;

and two ends of the first capacitor are respectively connected with the inverting input end of the first operational amplifier and the output end of the first operational amplifier.

Preferably, the wide-range amplifying circuit includes:

the positive phase input end of the second operational amplifier is connected with the output end of the first operational amplifier through a second capacitor, and the negative phase input end of the second operational amplifier is connected with the output end of the second operational amplifier through a fourth resistor;

the two ends of the third resistor are respectively connected with the inverting input end of the second operational amplifier and the grounding end;

and two ends of the fifth resistor are respectively connected with the positive phase input end of the second operational amplifier and the grounding end.

Preferably, the small-range amplifying circuit includes:

the positive phase input end of the third operational amplifier is connected with the output end of the first operational amplifier through a third capacitor, and the negative phase input end of the third operational amplifier is connected with the output end of the third operational amplifier through a seventh resistor;

the two ends of the sixth resistor are respectively connected with the inverting input end of the third operational amplifier and the grounding end;

and two ends of the eighth resistor are respectively connected with the positive phase input end of the third operational amplifier and the grounding end.

Preferably, the high-pass filter circuit includes:

a positive input terminal of the fourth operational amplifier is connected to the ground terminal through an eleventh resistor, and a negative input terminal of the fourth operational amplifier is connected to the output terminal of the fourth operational amplifier;

one end of the fourth capacitor is connected with the output end of the second operational amplifier, and the other end of the fourth capacitor is connected with the positive phase input end of the fourth operational amplifier through a fifth capacitor;

and the tenth resistor is respectively connected with the fifth capacitor and the output end of the fourth operational amplifier.

Preferably, a ninth resistor is further included between the small-scale amplification circuit and the high-pass filter circuit, and two ends of the ninth resistor are respectively connected to the output end of the third operational amplifier and the fourth capacitor.

Preferably, the first operational amplifier, the second operational amplifier, the third operational amplifier and the fourth operational amplifier each comprise a positive power supply terminal and a negative power supply terminal;

the voltage of the positive power supply end is +5V, and the voltage of the negative power supply end is-5V.

The invention has the beneficial effects that:

the traveling wave Rogowski coil with multi-range output is provided, and when the traveling wave current is measured, the Rogowski coil has two ranges of output: the large-range and small-range measuring device can be used for measuring large current, can also ensure the measurement precision under small current, reduces the construction difficulty on site, and improves the measurement precision of current.

Drawings

FIG. 1 is a circuit diagram of a traveling wave Rogowski coil having a multi-range output according to the present invention;

FIG. 2 is a schematic diagram of a structure of a traveling wave Rogowski coil with multi-range output according to the present invention;

FIG. 3 is a circuit diagram of an integrating circuit according to the present invention;

FIG. 4 is a circuit diagram of an amplifying circuit according to the present invention;

fig. 5-6 are schematic circuit diagrams of high-pass filter circuits according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.

The invention provides a traveling wave Rogowski coil with multi-range output, which belongs to the technical field of Rogowski coils and comprises the following components as shown in figures 1 to 2:

the Rogowski coil 1 is used for measuring a current signal, and the Rogowski coil 1 comprises a first output end and a second output end;

the positive phase input end of the integrating circuit 2 is connected with the first output end, the negative phase input end of the integrating circuit 2 is connected with the second output end, and the integrating circuit is used for integrating and converting the current signal into a voltage signal;

and an amplifying circuit 3, the amplifying circuit 3 further comprising:

the positive input end of the wide-range amplifying circuit 31 is connected with the output end of the integrating circuit 2 and is used for amplifying voltage signals with wide range;

the positive input end of the small-range amplifying circuit 32 is connected with the output end of the integrating circuit 2 and is used for amplifying a small-range voltage signal;

and the high-pass filter circuits (40 and 41), the high-pass filter circuits (40 and 41) are respectively connected with the output ends of the large-range amplifying circuit 31 and the small-range amplifying circuit 32, are used for performing high-pass filtering on output signals of the large-range amplifying circuit 31 and the small-range amplifying circuit 32, and are respectively output through the large-range output end 401 and the small-range output end 411.

Specifically, the rogowski coil 1 is used for measuring traveling wave current, the traveling wave rogowski coil 1 includes a rogowski coil 1, an integrating circuit 2, an amplifying circuit 3 and high-pass filter circuits (40, 41), a current signal measured by the rogowski coil 1 is integrated by the integrating circuit 2 and converted into a voltage signal, the voltage signal is amplified by the amplifying circuit 3 and then passes through the high-pass filter circuits (40, 41), and the amplified voltage signal is high-pass filtered and then respectively output through a large-range output end 401 and a small-range output end 411.

Further, the amplifying circuit 3 comprises a wide-range amplifying circuit 31 and a small-range amplifying circuit 32, the wide-range amplifying circuit 31 amplifies the voltage signal of the wide range, and the amplified wide-range voltage signal is filtered by a high-pass filter circuit (40, 41) and then output through a wide-range output end 401; the small-range amplifying circuit 32 amplifies the small-range voltage signal, and the amplified small-range voltage signal is filtered by the high-pass filter circuit (40, 41) and then output through the small-range output terminal 411. When the Rogowski coil 1 is used for measuring traveling wave current, the Rogowski coil has two ranges of large-range output and small-range output, can be used for measuring large current, can also ensure the measurement accuracy under small current, reduces the construction difficulty on site, and improves the measurement accuracy of current.

In a preferred embodiment, the traveling-wave rogowski coil 1, wherein the integrating circuit 2 includes:

a first operational amplifier U1, the non-inverting input terminal of the first operational amplifier U1 is connected to the first output terminal and a ground terminal, respectively, and the inverting input terminal of the first operational amplifier U1 is connected to the second output terminal through a first resistor R1;

a second resistor R2, wherein two ends of the second resistor R2 are respectively connected to the inverting input terminal of the first operational amplifier U1 and the output terminal of the first operational amplifier U1;

a first capacitor C1, wherein two ends of the first capacitor C1 are respectively connected to the inverting input terminal of the first operational amplifier U1 and the output terminal of the first operational amplifier U1.

Specifically, as shown in fig. 3, a non-inverting input terminal and an inverting input terminal of the integrating circuit 2 are respectively connected to a first output terminal and a second output terminal of the rogowski coil 1, and the integrating circuit 2 is composed of a first operational amplifier U1, a first resistor R1, a second resistor R2 and a first capacitor C1, and is configured to integrate and convert a current signal measured by the rogowski coil 1 into a voltage signal.

It should be noted that the integrating circuit 2 is widely applied in the technical field, and is not limited to the integrating circuit 2 for integrating the current signal into the voltage signal, and is not described herein again.

In a preferred embodiment, the traveling-wave rogowski coil 1, wherein the wide-range amplification circuit 31 includes:

a second operational amplifier U2, wherein the non-inverting input terminal of the second operational amplifier U2 is connected to the output terminal of the first operational amplifier U1 through a second capacitor C2, and the inverting input terminal of the second operational amplifier U2 is connected to the output terminal of the second operational amplifier U2 through a fourth resistor R4;

a third resistor R3, wherein two ends of the third resistor R3 are respectively connected to the inverting input terminal and the ground terminal of the second operational amplifier U2;

a fifth resistor R5, wherein two ends of the fifth resistor R5 are respectively connected to the non-inverting input terminal and the ground terminal of the second operational amplifier U2.

Specifically, as shown in fig. 4, the wide-range amplifying circuit 31 is composed of a second operational amplifier U2, a second capacitor C2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5, and is configured to amplify a wide-range voltage signal.

In a preferred embodiment, the traveling-wave rogowski coil 1, wherein the small-range amplification circuit 32 includes:

a third operational amplifier U3, wherein the non-inverting input terminal of the third operational amplifier U3 is connected to the output terminal of the first operational amplifier U1 through a third capacitor C3, and the inverting input terminal of the third operational amplifier U3 is connected to the output terminal of the third operational amplifier U3 through a seventh resistor R7;

a sixth resistor R6, wherein two ends of the sixth resistor R6 are respectively connected to the inverting input terminal and the ground terminal of the third operational amplifier U3;

an eighth resistor R8, wherein two ends of the eighth resistor R8 are respectively connected to the non-inverting input terminal and the ground terminal of the third operational amplifier U3.

Specifically, as shown in fig. 4, the small-scale amplification circuit 32 is composed of a third operational amplifier U3, a third capacitor C3, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8, and is configured to amplify a small-scale voltage signal.

As a preferred embodiment, the traveling wave rogowski coil 1, as shown in fig. 5 and 6, wherein the high-pass filter circuit (40, 41) includes:

a fourth operational amplifier (U4, U5), wherein the non-inverting input terminal of the fourth operational amplifier (U4, U5) is connected to the ground terminal through an eleventh resistor (R11, R13), and the inverting input terminal of the fourth operational amplifier (U4, U5) is connected to the output terminal of the fourth operational amplifier (U4, U5);

one end of the fourth capacitor (C4, C6) is connected with the output end of the second operational amplifier U2, and the other end of the fourth capacitor (C4, C6) is connected with the non-inverting input end of the fourth operational amplifier (U4, U5) through a fifth capacitor (C5, C7);

and a tenth resistor (R10, R12) respectively connected to the fifth capacitor C5 and the output terminal of the fourth operational amplifier (U4, U5).

Specifically, the high-pass filter circuits (40, 41) are composed of fourth operational amplifiers (U4, U5), fourth capacitors (C4, C6), fifth capacitors (C5, C7), tenth resistors (R10, R12), and eleventh resistors (R11, R13), and are configured to perform high-pass filtering on output signals of the large-scale amplification circuit 31 and the small-scale amplification circuit 32, respectively.

In a preferred embodiment, the traveling-wave rogowski coil 1 further includes a ninth resistor R9 between the small-scale amplification circuit 32 and the high-pass filter circuit (40, 41), and both ends of the ninth resistor R9 are respectively connected to the output terminal of the third operational amplifier U3 and the fourth capacitor C4.

In a preferred embodiment, the traveling-wave rogowski coil 1, wherein the first operational amplifier U1, the second operational amplifier U2, the third operational amplifier U3 and the fourth operational amplifier (U4, U5) each include a positive power supply terminal and a negative power supply terminal;

the voltage of the positive power supply end is +5V, and the voltage of the negative power supply end is-5V.

The invention has the beneficial effects that:

the traveling wave Rogowski coil with multi-range output is provided, and when the traveling wave current is measured, the Rogowski coil has two ranges of output: the large-range and small-range measuring device can be used for measuring large current, can also ensure the measurement precision under small current, reduces the construction difficulty on site, and improves the measurement precision of current.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.