GE DS200LDCCH1AGA processor module

GE DS200LDCCH1AGA processor module

Technical data of product parameters

The real power DS200LDCCH1AGAcomponent (real power component = proportion
of real power current x displacement voltage) of the zero-sequence power is monitored to detect E/F’s in systems with
Petersen coils and high-resistance grounded systems. The neutral component of the current in the healthy phases resulting
from their capacitances to ground and the inductive Petersen coil
current unite at the fault location and return to the source via the
faulted phase.A power relay is installed at both ends of every line with the exception of stub lines, which only require a relay at the source DS200LDCCH1AGA
end. If the E/F current is too low and has to be artificially increased, an overvoltage relay is fitted to detect the displacement
voltage and connect a grounding resistor temporarily to the starpoint. To avoid any incorrect response of the power relays while
this is being done, they are enabled after a short delay. The DS200LDCCH1AGA
section of the line with the fault is determined by comparison of
the relay directions.
The real power component of the E/F current is determined by
the resistive losses of the lines, the Petersen coils and the
grounding resistors. A typical value for the charging current of
overhead lines is around 2.5 A / 10 kV and 100 km. In the case
of cable systems, it can be determined from the cable data. The
minimum real power component of the current at the minimum
voltage at which the power relay has to operate can be determined according to the above procedure. The power at which it DS200LDCCH1AGA
must pick up must be set somewhat lower to allow for phase and
ratio errors of the c.t’s.
The parameter ‘Angle’ must be set to 0° to measure real power
in the forwards direction, respectively 180° to measure real
power in the reverse direction.
Assuming an overhead line system with an E/F current (sum of
the three phase currents) of 30 A and a real power current
component of 5 A. The core-balance c.t. has a ratio of 125:1.
The star-point v.t. has a secondary voltage of 100 V for a solid
E/F at the generator/power transformer terminals

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