Single Function Protection Products
Single Function Protection Products
IFC Time-overcurrent Relay
Type IFC relays are used for the protection of industrial and utility power systems against either phase or ground overcurrent. They are single-phase, non-directional, current sensitive AC devices. The basic operating mechanism (the time unit) produces one of several available operating characteristics with operating time inversely related to operating current to permit coordination with other protective devices. It consists of a magnetic-core operating coil, an induction disk, damping magnet, and a mechanical target. The IFC relay may also include a hinged-armature instantaneous overcurrent unit with its own target.
IAC Time-overcurrent Relay
Type IAC relays are used in the protection of industrial and utility power systems against either phase or ground overcurrent. They are single phase (although some models contain more than one unit), non-directional, current sensitive, AC devices. The basic operating mechanism (the time unit) produces one of several available operating characteristics. The operating time is inversely related to operating current which permits close coordination with other protective devices. It consists of a magnetic core operating coil, an induction disc, damping magnet, and a mechanical target. The IAC relay may also include one or more hinged armature instantaneous overcurrent units, with integral target.
IFCV TOC Relay with Voltage Restraint
The Type IFCV relays are draw out, induction disc time-overcurrent relays having voltage restraint and inverse time characteristics.
NGV Voltage Relay
The type NGV relay is a high-speed relay designed for calibration on decreasing voltage (drop-out), or increasing voltage (pick-up) and may be continuously energized at rated voltage. The NGV19 is a special relay available for application as a battery monitor.
PVD Differential Voltage Relay
The Type PVD21 relay is a single-phase, high-speed, high-impedance, voltage-operated relay designed to provide protection in bus differential schemes. The Type PVD21 utilizes the same operating principle (high impedance voltage) as the earlier PVD models, but provides faster operating speeds and higher seismic capabilities. Typical operating speed is 20 ms at 4X pickup. The Type PVD21 is mechanically interchangeable with the earlier PVD21 models, and provides additional output contacts.
SBD Differential Voltage Relay
The Type SBD11B is a single-phase, high-speed differential relay. It is specifically designed to provide bus differential protection, but may also be used for differential protection of shunt reactors. A high impedance, voltage measuring circuit with overcurrent supervision is used for fault detection. The utilization of static circuitry results in very short operating times. Output isolation is obtained with a telephone-relay, and a target seal-in unit is provided. A voltage selecting link allows the relay to operate on 48, 125, or 250 VDC. The relay is packaged in an S-2 type drawout case and requires no auxiliary CT's.
IAV Time Delay Voltage Relay
The Type IAV relays are single phase induction disk relays designed to respond, with time delay, to either an increasing or a decreasing voltage, or both. Some models are frequency compensated, and some include an instantaneous unit (hinged armature type). Most models listed in the Selection Guide include a target seal-in unit on all contacts.
GGP Power Directional Relays
The usual application of the GGP relay is to prevent motoring of a turbine-driven generator. Its intended purpose is to protect turbines not equipped with integral protective means if its steam supply is lost or reduced. Under such a condition the generator will take power from the bus and run light as a synchronous motor, driving the turbine at normal speed. With insufficient or no steam present in the turbine, the blades may be damaged by overheating as developed by windage. Under normal operating conditions, such heat is dissipated into the steam.
ICR Phase Sequence and Undervoltage
The Type ICR is a three-phase voltage operated induction-disk time delay relay designed to respond to phase sequence, open phase or undervoltage. Each ICR relay includes a basic induction-disk unit and may also include dual rated target seal-in units
IFV Time Delay Voltage Relay
The Type IFV relays are single phase induction disk relays designed to respond, with time delay, to an increasing voltage. Some models are frequency compensated, and some include an instantaneous unit (hinged armature type).
IJS Synchronism Check Relay
The Type IJS relay is an induction disk synchronism check relay that has two shaded pole U-magnet driving elements acting on opposite sides of a single rotating disk. One operating element drives the disk in the contact closing direction and the other in the restraining or opposite direction. The disk shaft is restrained by a spiral spring, to hold the contacts open when the relay is de-energized. The motion of the disk is slowed by permanent magnets to give a time delay.
JBC/JBCG/JBCV Phase and Ground Overcurrent Relay
The Types JBC, JBCG and JBCV relays consist of three units, an instantaneous power-directional unit (bottom) of the induction-cup type, a time overcurrent unit (middle) of the induction-disk type, and an instantaneous overcurrent unit (top) of the induction-cup type. The directional-unit contacts control the operation of both the instantaneous and the time-overcurrent units (directional control). In this application, the instantaneous unit provides high-speed protection for close-in high-current faults.
SAM Static Timing Relay
The SAM series of relays provide highly accurate and repeatable timing functions that produce a contact closure after a selected time delay has expired. The total time delay consists of the set time delay added to the operating time of the associated output relay (typically 2-6 ms).
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