Description
GE General Electric Technical Specifications: IS200VPROH1A
IS200VPROH1A Time overcurrent tripping time calculations are made with an internal ‘energy
capacity’ memory variable. When this variable indicates that the energy capac
ity has reached 100%, a time overcurrent trip is generated. If less than 100% is
accumulated in this variable and the current falls below the dropout threshold
IS200VPROH1A of 97 to 98% of the pickup value, the variable must be reduced. Two methods
of this resetting operation are available, Instantaneous and Linear. The Instan
taneous selection is intended for applications with other relays, such as most
static units, which set the energy capacity directly to zero when the current
falls below the reset threshold. The Linear selection can be used where the
relay must coordinate with electromechanical units. With this setting, the
energy capacity variable is decremented according to the following equation.
brand | Product Name | Product model | Order No |
GE Fanuc | Module card | IS200VPROH1A | nothing |
Place of Origin | Marketable land | Imported or not | defects liability period |
Europe and America | Nationwide and overseas | yes | a year |
Place of shipment | Delivery method | How to use | Applicable industries |
Xiamen | Shunfeng Express | Commissioning and installation | Power Plant Steel Plant Cement Plant Shipboard Papermaking |
Service advantages | Foreign import, goods preparation and supply | Reasonable price and reliable quality | Pictures are for reference only |
Product features | Primary source of goods, supply by model | After sales guarantee | Chen 1810693-7731 |
Directional overcurrent relaying is necessary for the protection of multiple source feeders, when it is essential
to discriminate between faults in different directions. It would be impossible to obtain correct relay selectivity
IS200VPROH1A through the use of a non-directional overcurrent relay in such cases. Fault directional control (ANSI device 67)
is incorporated into the relay for all phase, neutral, sensitive ground, and negative sequence overcurrent ele
ments. If directional control is selected, it will determine whether current flow in each phase is in the forward or
reverse direction, as determined by the connection of the phase source CTs, selected MTA angle, voltage and
current phasors. Each overcurrent element can be individually programmed to operate for flow only in specific
IS200VPROH1A directions. For increased security, all overcurrent elements under directional control add one power frequency
cycle of intentional delay to prevent operational errors on current ‘swings’.
Some terms commonly used in directional relaying are defined as:
Operating Current: the quantity whose directionality is to be tested.
Polarizing Voltage: a voltage whose phase will remain reasonably constant between a non-faulted and a
faulted system, used as a phase reference for the operating current.
Relay Connection: for phase directional relaying, the characteristic angle between the operating current
and the polarizing voltage in the non-faulted system.
Zero Torque Line: the boundary line between operating and blocking regions in the complex plane; in an
electromechanical directional relay, an operating current near this line generates minimum torque.
Maximum Torque Line: the line perpendicular, through the origin, to the Zero Torque Line in the complex
plane; in an electromechanical directional relay, an operating current near this line will generate a maxi
mum amount of torque.
Maximum Torque Angle (MTA): the angle by which the Maximum Torque Line is rotated from the Polariz
ing Voltage.
The following diagram specifically shows the phasors involved for phase A directional polarization, but the gen
eral principles can be applied to all directional elements.
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