It is also possible that one of the
ground fault devices, installed and functional at the time of construction, became defective at a later date.
Voltage variation indicating a single-phase to
ground faultThe MME curve of the three-phase short-circuit fault (Figure 7) was similar to that of the single-phase
ground fault. The data matrix adopted the node voltage matrix, which can also be expressed as (4).
Hou, Review of
Ground Fault Protection Methods for Grounded, Ungrounded, and Compensated Distribution Systems, Schweitzer Engineering Laboratories, Inc., Pullman, WA USA, 2001.
Application of a scheme of insulation resistance continuous measurement in a 3-phase network for
ground fault location: M -
ground fault locator, TK - DC current clamp meter
Basically, the faults that occur in a network feeder are single line to
ground fault with resistance [R.sub.f], double line to line and line to
ground faults with arc resistance [R.sub.arc] and ground resistance [R.sub.f]-in different phases; that before presenting the fault detection algorithm, these two types of short circuit faults are modeled on the basis of figure 27.
The data base will be represented as follows: for phase A to
ground fault the frequency spectrum pertaining to such faults is shown in Figures 8 and 9.
For direct-driven wind turbine generators system, distribution network carrying an asymmetric
ground fault can cause its power output to reduce, which will lead its DC bus voltage to drop.
Double Phase to
Ground Fault with High Fault Resistance.
The influence of leakage (
ground fault) resistance and line loading were taken under consideration.
Zenith revealed the new ESP gauge
Ground Fault Immune at the European Artificial Lift Forum in Aberdeen, where a paper was presented on the results of a demonstration test.