Self-calibration harmonic current transformer based on gapped iron core coil

A technology of iron core coil and harmonic current, applied in voltage/current isolation, instrument, measurement of electrical variables, etc.

Active Publication Date: 2014-03-12
浙江天际互感器股份有限公司
View PDF11 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this technical solution is that the use of air gap and shielding coil can only reduce the influence of leakage magnetic field so that the iron core is not suitable for saturation, but it cannot overcome the problem of narrow measurement frequency band and can only be used under power

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Self-calibration harmonic current transformer based on gapped iron core coil
  • Self-calibration harmonic current transformer based on gapped iron core coil
  • Self-calibration harmonic current transformer based on gapped iron core coil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0050] Example: such as figure 1 , figure 2 , image 3 As shown, the present invention is a self-calibrating harmonic current transformer based on a gapped iron core coil.

[0051] Iron core with gap (ring) 1, primary coil 2, secondary coil 4 for measurement, secondary coil 5 for protection, secondary coil 6 for monitoring, calibration coil 3 and annular shielding box 35 with slotted inner ring constitute the primary current Sensor; the secondary coil 4 for measurement, the secondary coil 5 for protection, the secondary coil 6 for monitoring and the calibration coil 3 are uniformly wound on the annular iron core 1 with a gap to form an annular core coil; the sampling resistor 7 is used A purely resistive precision resistor with a resistance value of 1KΩ and a temperature drift rate lower than 5ppm / °C; the digital-analog signal amplifier circuit 12 adopts a single-tube common-emitter amplifier circuit; Groove 36; communication interface 32 is RS485 communication interface. ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a self-calibration harmonic current transformer based on a gapped iron core coil. The transformer can output digital quantity and voltage simulation quantity which are linearly proportional to primary current containing harmonics, and can achieve the purposes of measurement and protection. The self-calibration harmonic current transformer comprises a gapped iron core, a primary coil, a measurement secondary coil, a protection secondary coil, a calibration coil, a monitoring secondary coil, an annular shielding box with a slotted inner ring, a first resistor, a second resistor, a third resistor, a sampling resistor, a first operational amplifier, a second operational amplifier, a third operational amplifier, a fourth operational amplifier, a first bidirectional voltage regulator tube, a second bidirectional voltage regulator tube, a third bidirectional voltage regulator tube, a fourth bidirectional voltage regulator tube, a signal conditioning circuit, an analog-to-digital converter, a microprocessor, a digital-to-analog conversion circuit, a calibration current drive circuit, a communication interface, and a first integral summation circuit and a second integral summation circuit which use a lossy integrator.

Description

technical field [0001] The invention relates to an electromagnetic measuring device, in particular to a self-calibrating harmonic current transformer based on an iron core coil with a gap for dual purposes of measurement and protection. Background technique [0002] Current transformer is a kind of current sensor, which is mainly used for grid electric energy measurement, electric energy quality analysis and safety protection. The national standard GB1208-2006 "Current Transformer" and GB / T20840.8-2007 "Transformer Part 8 Electronic Current Transformer" respectively stipulate the technical specifications of electromagnetic current transformer and electronic current transformer. The national standard GB / T14549-1993 "Power Quality Harmonics of Public Grid" and the national standard GB / T19862-2005 "General Requirements for Power Quality Monitoring Equipment" respectively stipulate the allowable value, detection method and current harmonic monitoring equipment of public grid har...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01R15/18G01R35/02
Inventor 谢岳祝顺峰唐福新毛培民
Owner 浙江天际互感器股份有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap