In distribution systems technique of neutral ground is usually
categorized into neutral unground, neutral ground via resistor, and
neutral-point grounding via arc suppression coil. Differnent
grounding ways decide various operating ways. With development of
economy , over-head line which is the main way of past power grid
has been replaced by cable running line. Meanwhile, some new
equipments such as hermetic compact structure of SF6 swichgear,
twisted polyethylene cable and zinc oxide arrester are more and
more widely applied. Therefore, non-effective grounding technique
is unsuitable to present situation. As a result, to set neutral
point grounding effectively is the important facet of power supply
we should work on.
If neutral grounding resistance cabinet is installed, the
current flowing through grounding point and neutral point would be
much lower than than when metallicity grounding. Therefore,
adopting neutral grounding via resistance could decrease transient
overvoltage when single-phase grounding, and eliminate arc flash
hazards like transient overvoltage and some resonant overvoltage
associated with the first ground fault, and moreover it could adopt
relays to quickly locate the fault circuit and clear it up.
Mingrui has outstanding technical researching team and
superior equipments,
specially concentrate on research &
development, production, sales and service of neutral grounding
series products of power distribution system. The transformer
neutral grounding resistance cabinet we developed and produced is
applicable to 6~*5KV power distribution grid of cable running lines
in cities, large industrial enterprises, factories, airports,
seaports, subway and etc. as well as 0.*6KV system in mine digging
and 0.4kv/6kv/*0kv system in power
plants.
