2017 New Style XJM7 Measuring Box (Low Voltage Power Measurement Box) to Munich Manufacturer

Overview:



Technical data

Product illustration

Tripping characteristic

Exterior and dimensions

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Our company puts emphasis on the management, the introduction of talented personnel, and the construction of staff building, trying hard to improve the quality and liability consciousness of staff members. Our company successfully attained IS9001 Certification and European CE Certification of 2017 New Style XJM7 Measuring Box (Low Voltage Power Measurement Box) to Munich Manufacturer, We appreciate your enquiry and it's our honor to work with every friend worldwide.


USE:

XJM7 series of lighting Power metering box is suitable in power centralized measurement management of apartment buildings office buildings. Pulse-type power meter can be installed  to according to the design needs to achieve computer management. Besides, proper location is preserved to install remote-measuring remote sensing equipment. There are small circuit breakers installed in the cabinet to protect the line from overload, short circuit. The power meter and circuit breaker rated current are selected by design.

In line with GB7251.1-1997 and 7251.3-1997 standards.

3C certificate:

XJM7 Measuring Box (Low Voltage Power Measu-2





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Electrical Faults ¦ Fault In Electrical Transmission Line ¦ Reason of faults ¦
Hi everybody, today I will share about Electrical Faults.
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An electric power system, a fault or fault current is any abnormal electric current. For example, a short circuit is a fault in which current bypasses the normal load. An open-circuit fault occurs if a circuit is interrupted by some failure. In three-phase systems, a fault may involve one or more phases and ground, or may occur only between phases. In a “ground fault” or “earth fault”, current flows into the earth. The prospective short circuit current of a predictable fault can be calculated for most situations. In power systems, protective devices can detect fault conditions and operate circuit breakers and other devices to limit the loss of service due to a failure.
There are I explain mainly two types electrical faults.
Symmetric fault. And
Asymmetric fault.

Symmetric fault
A symmetric or balanced fault affects each of the three phases equally. In transmission line faults, roughly 5% are symmetric. This is in contrast to an asymmetrical fault, where the three phases are not affected equally.
Asymmetric fault
An asymmetric or unbalanced fault does not affect each of the three phases equally. Common types of asymmetric faults, and their causes:
line-to-line. a short circuit between lines, caused by ionization of air, or when lines come into physical contact, for example due to a broken insulator. In transmission line faults, roughly 5% – 10% are asymmetric line-to-line faults.
line-to-ground . a short circuit between one line and ground, very often caused by physical contact, for example due to lightning or other storm damage. In transmission line faults, roughly 65% – 70% are asymmetric line-to-ground faults.
Reason of faults.
Insulation failure or break down.
Lighting surge.
Unbalance current or voltage.
Voltage drop.
Stability fall.
Mechanical fault in transmission line.
Over voltage.
Under Frequency.
Reversal of power.
Temperature Rise.

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Electrical Faults ¦ Fault In Electrical Transmission Line ¦ Reason of faults ¦
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content source by https://en.wikipedia.org/wiki/Fault_(power_engineering)

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