GE IS200TRLYH2E IS200TRLYH2F BD MARK VI relay

Description

GE General Electric Technical Specifications: IS200TRLYH2E

Phase overcurrent protection comprises two time overcurrent, two instantaneous overcurrent, and a phase

IS200TRLYH2E directional element. The directional element determines whether current flow is in the forward or reverse direc

tion, as determined by the connected polarity of the input CTs and the Maximum Torque Angle selected for the

phase directional element. Each phase overcurrent element can be programmed to either disable directionality

or provide a trip for current flow in the forward/reverse direction only. Two elements allow the use of ‘Loset’ and

IS200TRLYH2E ‘Hiset’ detectors in autoreclose applications, zone-selective (blocking) schemes, and distinct settings for faults

in different directions. Phase overcurrent protection elements can be blocked individually or by logic inputs.

To increase security for three phase faults very close to the location of the VTs used to measure the polarizing

IS200TRLYH2E voltage, a voltage memory feature is incorporated. This feature remembers the last measurement of the

polarizing voltage which is greater than the MINIMUM POLARIZING VOLTAGE setting and uses it to determine direc

tion. The voltage memory remains valid for one second after the voltages have collapsed. Once the voltage

memory has expired, after one second, the phase overcurrent elements under directional control can be set to

block or trip on overcurrent. When set to Enabled, the setpoint BLOCK OC WHEN VOLT MEM EXPIRES will block the

operation of any phase overcurrent element under directional control when voltage memory expires. When set

to Disabled, directional blocking of any phase overcurrent element will be inhibited. The voltage memory is

updated immediately when the polarizing voltage is restored.

To complement the voltage memory feature, a ‘Close Into Fault’ (CIF) feature allows close-in faults to be

cleared when energizing a line. When the BLOCK OC WHEN VOLT MEM EXPIRES setpoint is Disabled, the CIF fea

ture permits operation of any phase overcurrent element if current appears without any voltage. When set to

Enabled the CIF feature inhibits operation of any phase overcurrent element under directional control under

these conditions. In both cases, directional blocking will be permitted to resume when the polarizing voltage

becomes greater than the ‘minimum polarizing voltage’ setting

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Lead time problem
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