Integrator for Rogowski coil and its realizing method

A technology of integrators and coils, applied in the field of integrators of Rogowski coils, can solve problems such as instability and mapping errors

Active Publication Date: 2008-12-03
HANGZHOU VANGO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0036] The technical problem to be solved by the present invention is that, in order to overcome these defects, it is necessary to propose a new method based on The filter banks for the current measurement channel and the voltage measurement channel respectively form a Rogowski coil integrator

Method used

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  • Integrator for Rogowski coil and its realizing method
  • Integrator for Rogowski coil and its realizing method
  • Integrator for Rogowski coil and its realizing method

Examples

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Embodiment Construction

[0090] refer to figure 1 , showing a schematic diagram of a Rogowski coil, in which i(t) is the measured current, and e(t) is the measured electromotive force.

[0091] refer to figure 2 , which represents the schematic diagram of the ideal analog integration link realized by using an analog circuit.

[0092] refer to image 3 , which represents the schematic diagram of an ideal analog integral link approximated by using an inertial link. The figure shows that an ideal analog integrator is approximated as an inertial link. An ideal integrator consists of an op amp and several passive components. operational amplifier OP, a resistor R c and capacitance C. But it is not stable. The feedback resistor R in the circuit f It makes the system stable, but it will bring a large approximation error.

[0093] refer to Figure 4 , which represents one way to implement an analog integrator. The differential signal input passes through a stabilized filter H f (s)H i (s)=H f (s...

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Abstract

This invention relates to an integrator used in Rogowski coil and its realizing method composed of a pair of stable filters used in a current measurement channel and a voltage measurement channel, in which, an analog integrator includes an analog filter and a filter composed of the analog one cascaded with an ideal analog integrator, a digital integrator includes a digital filter and a filter composed of the filter cascaded with an ideal digital integrator, the integrator is realized according to the steps of analog and digital ways, which can be used in the measurement of electric energy accurately.

Description

technical field [0001] The invention belongs to the field of electric energy metering. In particular, it relates to a method for implementing an integrator for a Rogowski coil. The method includes a pair of analog or digital filters respectively used in the current measurement channel and the voltage measurement channel, and the filter bank implements the characteristics of an integrator and is used to cooperate with a Rogowski coil for differential signal output. Background technique [0002] In electric energy metering, current transformer is an indispensable and important device for measuring current. In addition to the traditional electromagnetic current transformer, the current transformer used in the power system also uses a differential current transformer with a Rogowski coil as the current sampling element. A new type of current sensor using a Rogowski coil can work in a differential state. At this time, the output of the transformer is not a current signal, but a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R22/06G01R22/10
CPCG01R15/181
Inventor 谭年熊王荣华
Owner HANGZHOU VANGO TECH
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