Sepam series 40 specification form
... Modification of the control logic program by using logic equation editor. storage of information (even during control power supply outages). As an option, monitoring of the circuit breaker for maintenance statistics purpose: operating time, charging time, trip circuit supervision (covering pow ...
... Modification of the control logic program by using logic equation editor. storage of information (even during control power supply outages). As an option, monitoring of the circuit breaker for maintenance statistics purpose: operating time, charging time, trip circuit supervision (covering pow ...
electric lineman protection using user changeable password based
... where several circuits must be controlled by one signal. The first relays were used in long distance telegraph circuits as amplifiers: they repeated the signal coming in from one circuit and re-transmitted it on another circuit. Relays were used extensively in telephone exchanges and early computers ...
... where several circuits must be controlled by one signal. The first relays were used in long distance telegraph circuits as amplifiers: they repeated the signal coming in from one circuit and re-transmitted it on another circuit. Relays were used extensively in telephone exchanges and early computers ...
Supplementary Instructions for Reduced-Voltage
... For starters with a current transition relay (CTR on diagram) the recommended setting is the equivalent of 120 percent of motor full-load current. This setting may be increased as needed to obtain transition before the incomplete sequence timer operates, but the relay current setting should never be ...
... For starters with a current transition relay (CTR on diagram) the recommended setting is the equivalent of 120 percent of motor full-load current. This setting may be increased as needed to obtain transition before the incomplete sequence timer operates, but the relay current setting should never be ...
General-purpose, Low-cost, Two-pole Relays for Signal Circults
... The tests were conducted at an ambient temperature of 23°C. The contact resistance data are periodically measured reference values and are not values from each monitoring operation. Contact resistance values will vary according to the switching frequency and operating environment, so be sure to chec ...
... The tests were conducted at an ambient temperature of 23°C. The contact resistance data are periodically measured reference values and are not values from each monitoring operation. Contact resistance values will vary according to the switching frequency and operating environment, so be sure to chec ...
Three-phase monitoring relay for grid feeding CM-UFS.1, CM
... between the grid connected, decentral electrical energy source such as photovoltaic systems, wind turbines, block-type thermal power stations, and the public grid. In case the public grid is disconnected due to any reason, for instance during maintance work, the CM-UFS.1/CM-UFS.1x recognize this pow ...
... between the grid connected, decentral electrical energy source such as photovoltaic systems, wind turbines, block-type thermal power stations, and the public grid. In case the public grid is disconnected due to any reason, for instance during maintance work, the CM-UFS.1/CM-UFS.1x recognize this pow ...
General Specification for Digital Protective Relay of MV Switchgear
... 4.1.8 Differential protection shall integrate H2 and H5 Harmonic restraint to prevent a transformer nuisance tripping during the energising period and stability on external zone fault. 4.1.9 Alternative over current setting groups shall be selectable by logical conditions through logic inputs or com ...
... 4.1.8 Differential protection shall integrate H2 and H5 Harmonic restraint to prevent a transformer nuisance tripping during the energising period and stability on external zone fault. 4.1.9 Alternative over current setting groups shall be selectable by logical conditions through logic inputs or com ...
Document
... will respond to high-side ground faults as long as the highside ground source remains connected. Further, and important to our investigation, it is commonly stated that because the normal power flow is toward the low-side, the 67P may be set more sensitively and possibly faster than traditional high ...
... will respond to high-side ground faults as long as the highside ground source remains connected. Further, and important to our investigation, it is commonly stated that because the normal power flow is toward the low-side, the 67P may be set more sensitively and possibly faster than traditional high ...
INCH-POUND MIL-PRF-83536/11B 15 July 2002 SUPERSEDING
... 1/ Each relay possesses high level and low level capabilities. However, relays previously tested or used above 10 mA resistive at 6 V dc maximum or peak ac open circuits are not recommended for subsequent use in low level applications. 2/ The suffix letter L, M, P, or R to designate the applicable f ...
... 1/ Each relay possesses high level and low level capabilities. However, relays previously tested or used above 10 mA resistive at 6 V dc maximum or peak ac open circuits are not recommended for subsequent use in low level applications. 2/ The suffix letter L, M, P, or R to designate the applicable f ...
time delay relays
... THR-3 Series Encapsulated--Relay Output Programmable: Multi-Func tion, Multi-Time Range & M ul ti-V o lt ag e The THR-3 Series products are designed to replace thousands of products from Macromatic and many other manufacturers with just three Catalog Numbers. Each comes with four functions & four ti ...
... THR-3 Series Encapsulated--Relay Output Programmable: Multi-Func tion, Multi-Time Range & M ul ti-V o lt ag e The THR-3 Series products are designed to replace thousands of products from Macromatic and many other manufacturers with just three Catalog Numbers. Each comes with four functions & four ti ...
Protective relay
In electrical engineering, a protective relay is a device designed to trip a circuit breaker when a fault is detected. The first protective relays were electromagnetic devices, relying on coils operating on moving parts to provide detection of abnormal operating conditions such as over-current, over-voltage, reverse power flow, over- and under- frequency. Microprocessor-based digital protection relays now emulate the original devices, as well as providing types of protection and supervision impractical with electromechanical relays. In many cases a single microprocessor relay provides functions that would take two or more electromechanical devices. By combining several functions in one case, numerical relays also save capital cost and maintenance cost over electromechanical relays. However, due to their very long life span, tens of thousands of these ""silent sentinels"" are still protecting transmission lines and electrical apparatus all over the world. An important transmission line or generator unit will have cubicles dedicated to protection, with many individual electromechanical devices, or one or two microprocessor relays.The theory and application of these protective devices is an important part of the education of an electrical engineer who specializes in power systems. The need to act quickly to protect circuits and equipment as well as the general public often requires protective relays to respond and trip a breaker within a few thousandths of a second. In these cases it is critical that the protective relays are properly maintained and regularly tested.