Cable-charging breaking current
Cable-charging breaking current
(OP)
Dear all expertise,
Please help me to explain what cable-charging breaking current is? What is different between 10A and 22A cable-charging breaking current in load break switch?
Can anyone provide a tutorial, or point me to a publication that can give me a good background on the subject?
Thank you very much.
Please help me to explain what cable-charging breaking current is? What is different between 10A and 22A cable-charging breaking current in load break switch?
Can anyone provide a tutorial, or point me to a publication that can give me a good background on the subject?
Thank you very much.






RE: Cable-charging breaking current
http://www.abb.com/GLOBAL/abbzh/ABBZH289.NSF/viewunid/2...$file/9.+SafeRing+SafePlus+-+Technical+Data.pdf
page 73 item 12 "Earth Fault Cable Charging"
http://www.abb.com/GLOBAL/ABBZH/ABBZH262.nsf/viewunid/E...$file/EDT+Compact+ENG_Ed2_May2001.pdf
http://www.cgswgear.com/products/sf72.5sfm.pdf
Transmission lines, especially high voltage ones, are charged with a capacitive charge that causes the cable charge breaking current.
There is also charging current to ground, which is a different current. It is often used for a selection of the system grounding method.
The charging current is a capacitive current that usually flows from electrical equipment to ground and flows to the system neutral.
Reference:
Electrical Transmission and Distribution Reference Book by Central Station Engineers of the Westinghouse Electric Corporation, East Pittsburgh, Pennsylvania, 1064,
Page 279 Section IV Typical Transmission Line Characteristics
RE: Cable-charging breaking current
Thank you very much for your answer. However, it doesn’t correct exactly. The question is what phenomena happen during open circuit connected with cable. And what is different between 10A and 22A breaking current?
Thank all expertise for helping again.
RE: Cable-charging breaking current
If there is any particular load break switch under consideration, then the load break switch manufacturer might be contacted for an application note for this product to have the switch parameters demonstrated via interruption of the cable charging and cable breaking capacitive reactance current that is a result of the stored capacitive energy in the cable.
RE: Cable-charging breaking current
Thank you very much for your answer. However, it doesn’t clear for me. I think that because of open question so it’s hard to answer. I shall ask again.
1. Difference in rated cable charging breaking current is up on difference in line capacitive, right?
2. What happen on contact of load break switch during breaking? …. High voltage transient or etc?
Thank all expertise for helping again^2.
RE: Cable-charging breaking current
RE: Cable-charging breaking current
IEEE Std 399-1997 (Brown Book) IEEE Recommended Practice for Industrial and Commercial Power System Analysis,
Chapter 11 Switching Transient Studies on page 313
Section 11.1.6 Transient Example: Capacitor Voltage
Figure 11-11 Capacitor Bank Switching
etc.