Microcomputer protector of current mutual inductor

A current transformer and protection device technology, which is applied in the field of protection devices for circuit facilities, can solve the problem that the protection principle of current transformer protection devices has not been greatly developed and innovated.

Active Publication Date: 2006-08-16
江苏能建机电实业集团有限公司
View PDF0 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In a word, the applicant feels in the in-depth research that the protection principle of the current transformer protect

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
  • Microcomputer protector of current mutual inductor
  • Microcomputer protector of current mutual inductor
  • Microcomputer protector of current mutual inductor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The microcomputer-based current transformer protection device of this embodiment mainly figure 2 Analog quantity acquisition circuit, image 3 Central processing circuit, Figure 4 Relay output circuit, Figure 5 Power supply circuit, and Figure 6 The external interface and display circuit constitute. Its external wiring such as figure 1 As shown, 1CT-4CT is an external high-voltage current transformer (CT for short), of which 3CT and 4CT are separate input circuits, which can be used to connect zero-sequence current. +KM1 and -KM1 are direct current, which is taken from the direct current bus (the power supply of this equipment can be used for DC220V or AC220V, and DC220V is generally used in the power system). 1DK is a small DC air switch. X2:1——X2:5, X2:6——X2:10, X2:11——X2:12, X2:13——X2:14 are the four sets of signal contacts of the protection device, the particularity of which is the input and Output through contact. Among them, X2:1——X2:5, X2:6——X2:10 each correspond...

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 consists of an analog quantity collecting circuit, a central process circuit, a relay output circuit, an external port and a display circuit. Wherein, the analog quantity collecting circuit comprises a primary side external current transformer, a voltage transformer whose two ends at secondary side is connected to a sampling resistor, a low-pass filter circuit passing by voltage of sampling resistor, and an positive input end of operational amplifier. The operational amplifier adopts voltage tracing method, and its output is connected to the AD input of CPU in central processing circuit. The output of switching value of CPU is connected to the controlled end of short circuit relay at primary side through photoelectrical coupler.

Description

Technical field [0001] The invention relates to a protection device for a circuit facility, in particular to a protection device for a current transformer. Background technique [0002] Modern power systems have increasingly higher requirements for automation, especially automatic measurement and automatic control. According to the applicant's understanding, current transformers and voltage transformers are widely used in existing power systems to control current, voltage, and frequency (which can be measured by collecting AC voltage). [0003] Generally, the protection of voltage transformers can be realized by leakage switches or air circuit breakers, which is relatively simple, while the protection of current transformers has not seen development for a long time. In fact, the open circuit of the current transformer is more serious than the short circuit of the voltage transformer. A short-circuit of the voltage transformer will burn itself at best, and an open current transfor...

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): H02H7/22H02H7/00
Inventor 许海洋郭余庆
Owner 江苏能建机电实业集团有限公司
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