Unlock instant, AI-driven research and patent intelligence for your innovation.

Electronic trip unit with user-adjustable sensitivity to current spikes

A technology of electronic tripping and tripping signals, applied in the direction of protection reacting to overcurrent, switches operated by ground fault current, electrical components, etc., capable of solving problems such as circuit breaker tripping

Inactive Publication Date: 2006-11-01
ABB (SCHWEIZ) AG
View PDF1 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This current spike can trip the circuit breaker even if the short circuit does not exist
Tripping from these current spikes is meaningless

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
  • Electronic trip unit with user-adjustable sensitivity to current spikes
  • Electronic trip unit with user-adjustable sensitivity to current spikes
  • Electronic trip unit with user-adjustable sensitivity to current spikes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] Refer to attached image 3 , the power distribution circuit is usually shown in 10. The power distribution circuit 10 includes a power source 12 , an upstream circuit breaker 14 , a downstream circuit breaker 16 , and at least one corresponding load 18 . Any number of other downstream circuit breakers 20 with corresponding loads 22 may also be included. It should be understood that circuit breakers 14, 16 and 20 may be of similar construction.

[0019] Refer to attached Figure 4 , the overall outline of the circuit breaker is shown in 20. The circuit breaker 20 includes a trip unit 22 , operating mechanism 24 and contacts 26 all secured within a housing 28 . Contacts 26 form part of the power distribution circuit 10 and are mechanically connected to the operating mechanism 24 . The operating mechanism 24 is used to receive a trip signal from the trip unit 22 , and the trip unit 22 is electrically connected to the power distribution circuit 10 . Upon receipt of th...

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

A circuit breaker trip unit (22) with user-adjustable sensitivity to current spikes, which includes a user-adjustable switch (30), a current sensor (32), an A / D converter (34), a microprocessor (36) and a power supply ( 37). The microprocessor (36) includes a plurality of registers (42-48) and built-in ROM (50). A short circuit protection algorithm within ROM (50) compares the line signal stored in threshold register (48) with preset thresholds stored in ROM (50). If the line signal exceeds this threshold, the microprocessor increments the peak count value in the peak count register (42). When the peak count reaches a limit value in the peak count register (42), the microprocessor (36) generates a trip signal.

Description

[0001] This application is a divisional application of a patent application with an application date of June 2, 2000, an application number of 00117986.1, and an invention title of "Electronic Trip Unit with Adjustable Sensitivity to Current Spikes by Users". technical field [0002] The present invention generally relates to circuit breaker trip units. Specifically, the invention relates to an electronic trip unit with adjustable current peak sensitivity. Background technique [0003] Electronic trip units are well known for use in circuit breakers. Trip units are used to provide short-circuit protection for power distribution circuits, among other purposes. In this role, the trip unit picks up current from the transmission lines of the power distribution system for use in detecting short circuit conditions. If a short circuit is detected, the trip unit sends a trip signal to an operating mechanism within the circuit breaker, such as a trip coil. After receiving the trip...

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): H02H3/08H02H3/093H01H83/02H02H1/04H02H3/02H02H3/44
CPCH02H1/04H02H3/08H02H3/44
Inventor A·J·梅塞利M·F·库勒
Owner ABB (SCHWEIZ) AG