Publication Date: April, 2005
Discount Price: $12.50 (Cdn)
Discount Price: $10.99 (U.S.)
|
CIRCUIT BREAKERS HANDBOOK VOL. 1
Circuit Breakers design, applications, safety, and maintenance are the most important aspects of this new technical handbook by the Electricity Forum -- giving electrical engineers and contractors the vital information they need to select and specify switchgear and control equipment. A more detailed section on proper maintenance and testing techniques is included. This 100+ page handbook discusses the details of this critical and timely issue.
CONTENT:
- A company story in advanced technologies for high-voltage switchgear
- Overview of currently available UIT-like systems
- A new measurement method of the dynamic contact resistance of HV equipment
- Arc resistant switchgear retrofits
- Timing tests
- Overcurrent protection in low voltage electrical circuits
- Overload or short circuit protection?
- On-line condition monitoring systems for high voltage breakers: a collaborative research project 1997-2001
- Overcurrent protection in long lines
- Solid state trip unit accessories
- Frequently asked questions about the magnetic actuators and AMVAC breakers
- Transient recovery voltage (TRV) for high-voltage circuit breakers
- Implementation of new monitoring tools and optimization of maintenance through the use of web-based technology
- Reliability study for the refurbishment of an HV/MV transformer substation
- Inspection, maintenance, and rebuilding options for older circuit-switchers
- Using electronic circuit protection technology to minimize factory downtime
- Power/Vac switchgear concepts
- Also: Directory of Manufacturers and Suppliers
- -- 96 Pages
Product Description: A device that is an automatically-operated switch which is designed to protect an electrical branch from damage caused by overload or short. Unlike a fuse which operates once and then has to be replaced, a can be reset (either manually or automatically) to resume normal operation. They are made in varying sizes, from small devices which protect an individual household appliance up to large switchgear designed to protect high voltage branches feeding an entire city.
Some types are implemented using a solenoid (electromagnet) whose pulling force increases as the current increases. The contacts are held closed by a latch and, as the current in the solenoid increases, the solenoid's pull releases the latch which then allows the contacts to open by spring action. Another method of sensing current is with a bimetallic strip, which heats and bends with increased current, and is similarly arranged to release the latch. Some types incorporate both techniques, with the electromagnet responding to short, large surges in current and the bimetallic strip responding to less extreme but longer-term overcurrent conditions. For larger currents, some types are usually arranged with pilot devices to sense a fault current and to operate the trip opening mechanism. - Wikipedia
|
