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past power grid has been replaced by cable running line.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.
