» ABB Master Trip Relay Latest Jobs Openings in Companies in India
Often there is the application requirement to trip more than one breaker when the seriousness of the fault condition warrants it. With today’s protection relay technology, there is most likely only one relay available that must be tasked to trip all essential breakers. However, this lone relay will have only one trip signal that would not only have to be duplicated, but also extended to trip those extraneous breakers.
Advanced relay technology allows for programming the master trip signal to multiple programmable output contacts to wire to the multiple trip circuits. However, if the trip signal resets itself or drops out when the primary breaker opens to isolate the fault, it does not last long enough to trip all the breakers – this is the case in 2000R relay systems.
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To protect a.c. motors and small generators there is need for relays with multifunctional features. Protection against thermal overload, earth-fault, overcurrent, overvoltage and phase unbalance are some important features that are provided in modern protective relays.
SPAM 150 C is a current measuring multifunction relay for the complete protection of a.c. motors. The main area of application covers large or medium-sized three-phase motors in all types of conventional contactor or circuit-breaker controlled motor drives. The motor protection relay is available in two versions, one with a trip contact and the other with a breaking trip contact.
The high threshold AR is a sensitive high speed auxiliary relay with 4 normally open contacts designed to be secure against misoperation due to inadvertent grounding of a station battery or the trip lead. With the battery balanced with respect to ground, the maximum momentary voltage that can be applied to an auxiliary relay for either of these ground is half battery voltage. The operating level of the high threshold AR exceeds these levels. The type ARS relay is composed of 1 or 2 AR units with series resistors, a printed circuit module, and indicating contactor switches (ICS) when required.
The ITH is a solenoid operated device with an adjustable core screw which adjusts the ac current pickup of the device over a 2 or to 1 range. Operating speed of the ITH unit over nominal range (60 Hz base) is as follows: at 200% of trip setting - less than 1 cycle, at 500% of trip setting - 1/2 cycle, at 1000% of trip setting - 1/4 cycle.
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The AR relay is a four-pole auxiliary type relay designed for ultra high speed circuit breaker tripping duty in protective relaying systems. It is well suitable for bus arrangements where more than one breaker must be tripped. The relay mayalso be applied to provide isolation of primary and back-up relaying, and provide high speed tripping for zone 1 faults.
The high threshold AR is a sensitive high speed auxiliary relay with 4 normally open contacts designed to be secure against misoperation due to inadvertent grounding of a station battery or the trip lead. With the battery balanced with respect to ground,
The current measuring relay type RXIG is a static, instantaneous ac current relay which can be used as over- or undercurrent protection. The instantaneous and time delayed overcurrent protections with RXIG are used in a number of different applications, such as: short-circuit protection, earth-fault protection, capacitor bank unbalance protection generator interturn short-circuit protection, blockable overcurrent relays for busbar protection, special applications, such as blocking of tap changer regulation.
The overcurrent protections RAIG are built-up based upon the overcurrent relay RXIG 2. RAIG is available in several versions, with and without time-lag relay and with different duty on trip outputs.
The MMCO is a microprocessor-based multiphase instantaneous and time overcurrent relay. The MMCO uses microprocessor technology to incorporate eight time curve families into one relay. Any traditional COtype curve family may be selected from the relay’s memory.
The MMCO can be programmed and interrogated manually or remotely. All trip parameters (time curve, time dial, pickup, instantaneous) are programmable, and fault data and metering current values are accessible by push button selection from a scrolling digital display. A real-time clock option allows time-tagging of fault records, and display of present time.
The device type RD196 is an amperometric relay of maximum homopolar differential current to use to control the insulation towards earth of networks of energy supplier, of electric machines, etc. The device must be joined at a suitable toroidal current transformer of the TR line in the way to point out the earth leakage current of the system to control and to protect.
The toroidal current transformer point out the vectorial sum of the currents present on the active conductor of single-phase line, three-phase with or without neutral, in the way to point up the leakage current towards earth, depend
As the test block evolved, the Westinghouse Type FT (Flexitest) was developed, and was a test block with an insulated, draw-out style, protective relay case. Such a device is described in a Westinghouse Instruction Manual, I.L.41-076D, effectiveFebruary 1965. The test block at the lower edge of the case contains two color, coded "knife-blade test switches." Westinghouse recommends: "Always open the red handle switches first before any of the black handle switches.”
The individualknife-blade test switches provide the test technician with individual switching control of each external connection. The reference to the red handles is a recommendation to open the trip circuits
The MMCO greatly simplifies overcurrent relay selection and enhances the protective relay function. It can be programmed to fit virtually any overcurrent application, and provides valuable fault information not available from conventional relays. Communications options provide immediate retrieval of fault and status data, and the ability to reset or reconfigure the relay remotely.
The MMCO uses microprocessor technology to incorporate eight time curve families into one relay. Any traditional COtype curve family may be selected from the relay’s memory.
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CA generator differential relay is a single phase, induction disc type with inverse timing characteristics. It is provided with one operating winding and two restraining windings without taps. Designed for 2-winding transformer protection, the CA transformer differential relay has a constant percentage differential characteristic and inverse timing. It is a single-phase unit, and three relays are used for three-phase transformer protection The CA-16 relay is a single-phase differential relay used for protection of multicircuit buses up to a total of six circuits. The CA-26 relay provides differential protection for both 2- and 3-winding transformers. It is also suitable for combination
The MMCO greatly simplifies overcurrent relay selection and enhances the protective relay function. It can be programmed to fit virtually any overcurrent application, and provides valuable fault information not available from conventional relays. Communications options provide immediate retrieval of fault and status data, and the ability to reset or reconfigure the relay remotely.
The MMCO uses microprocessor technology to incorporate eight time curve families into one relay. Any traditional COtype curve family may be selected from the relay’s memory.
The type KV-1 is a high-speed single phase undervoltage relay particularly suited for applications where high drop-out ratio is desirable. This relay may be used for high-speed carrier tripping or carrier starting for phase fault clearing of a weak-feed terminal. Hot-Line reclosing is another application for this relay.
The type 47 relays provide three-phase undervoltage and phase-sequence protection for protection of motors, or for the initiation of bus transfer. A major benefit of this relay is that is is more sensitive to unbalanced voltages ("single-phasing") than many of the comparable electro-mechanical types.
The earth-fault relay SPAJ 110 C is designed to be used for selective earth-fault protection, either primary or back-up protection, in solidly earthed or low-resistance earthed power systems. The relay has two protection stages: a low-set overcurrent stage I 0 > and a high-set overcurrent stage I 0 .
The low-set stage operates with definite-time characteristic or with inverse-time characteristic, while the high-set stage operates with definite time characteristic only. The earth-fault relay is used both as primary and back-up earth-fault protection relay for feeders, transformers, generators and motors. The relay can be configured to cooperate with a residual voltage
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