- IEEE Mentor
... Attention is called to the possibility that implementation of this recommended practice may require use of subject matter covered by patent rights. By publication of this recommended practice, no position is taken with respect to the existence or validity of any patent rights in connection therewith ...
... Attention is called to the possibility that implementation of this recommended practice may require use of subject matter covered by patent rights. By publication of this recommended practice, no position is taken with respect to the existence or validity of any patent rights in connection therewith ...
sc200 Controller
... and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses and can radiate r ...
... and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses and can radiate r ...
sc200 Controller Full User Manual
... protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in ...
... protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in ...
Fuse Facts - Marine Electricity
... NUISANCE OPENING: Nuisance opening is most often caused by an incomplete analysis of the circuit under consideration. Of all the “Selection Factors” listed in the FUSE SELECTION GUIDE, special attention must be given to items 1, 3, and 6, namely, normal operating current, ambient temperature, and pu ...
... NUISANCE OPENING: Nuisance opening is most often caused by an incomplete analysis of the circuit under consideration. Of all the “Selection Factors” listed in the FUSE SELECTION GUIDE, special attention must be given to items 1, 3, and 6, namely, normal operating current, ambient temperature, and pu ...
Applications for SIPROTEC Protection Relays
... considered as a backup in the event of a fault which can then supply the faulty, disconnected busbar section with energy again. Each circuitbreaker operates autarchically and is controlled by one single multifunction relay. ...
... considered as a backup in the event of a fault which can then supply the faulty, disconnected busbar section with energy again. Each circuitbreaker operates autarchically and is controlled by one single multifunction relay. ...
Transient Voltage Surge Suppression
... assessment and protection. Research and standards committees publish many standards relating to surge risk and immunity. These standards however differ from one geography to another. Of importance is that there are two basic low voltage standards in the world. In the U.S. it is 120Vac, 60Hz. ( half ...
... assessment and protection. Research and standards committees publish many standards relating to surge risk and immunity. These standards however differ from one geography to another. Of importance is that there are two basic low voltage standards in the world. In the U.S. it is 120Vac, 60Hz. ( half ...
8. Molded Case Circuit Breakers
... The trip unit is the brains of the circuit breaker. The function of the trip unit is to trip the operating mechanism in the event of a short circuit or a prolonged overload of current. Traditional molded case circuit breakers use electromechanical (thermal magnetic) trip units (Module 5 covers this ...
... The trip unit is the brains of the circuit breaker. The function of the trip unit is to trip the operating mechanism in the event of a short circuit or a prolonged overload of current. Traditional molded case circuit breakers use electromechanical (thermal magnetic) trip units (Module 5 covers this ...
Residual Current Protective Devices
... currents. Another version in this device group is the residual current unit (RC unit). The customer can then mount the miniature circuit breaker versions suitable for a particular application (characteristic, rated current, switching capacity) on these RC units. Once assembled, these devices perform ...
... currents. Another version in this device group is the residual current unit (RC unit). The customer can then mount the miniature circuit breaker versions suitable for a particular application (characteristic, rated current, switching capacity) on these RC units. Once assembled, these devices perform ...
(Selective).
... in the EPSS shall be coordinated to optimize selective tripping of the circuit overcurrent protective devices when a short circuit occurs. * Explanation in NFPA 110 Annex A: “A.6.5.1: It is important that the various overcurrent devices be coordinated, so far as practicable, to isolate faulted circu ...
... in the EPSS shall be coordinated to optimize selective tripping of the circuit overcurrent protective devices when a short circuit occurs. * Explanation in NFPA 110 Annex A: “A.6.5.1: It is important that the various overcurrent devices be coordinated, so far as practicable, to isolate faulted circu ...
CLiP® APPLICATION TYPICAL QUESTIONS AND ANSWERS
... 4. Does the CLiP vent or issue a flame when it operates? No, the CLiP does not vent or issue a flame during interruption. It is not an expulsion device. It does allow a very gradual pressure relief through the stranding of its triggering wire so that personnel replacing the interrupter are not work ...
... 4. Does the CLiP vent or issue a flame when it operates? No, the CLiP does not vent or issue a flame during interruption. It is not an expulsion device. It does allow a very gradual pressure relief through the stranding of its triggering wire so that personnel replacing the interrupter are not work ...
Relays and Meters - GE Industrial Solutions
... The Multilin line of protection and control products are based on industry leading technologies essential for the reliable operation of mission-critical applications including generation, transmission, distribution, metering, motors, and communications. Multilin protection relays and systems are com ...
... The Multilin line of protection and control products are based on industry leading technologies essential for the reliable operation of mission-critical applications including generation, transmission, distribution, metering, motors, and communications. Multilin protection relays and systems are com ...
AFDD * Arcing Fault Protection
... At a high arc voltage and system impedance, the value of the arc current may lie below the magnetic tripping current of the overcurrent circuit breaker. ...
... At a high arc voltage and system impedance, the value of the arc current may lie below the magnetic tripping current of the overcurrent circuit breaker. ...
Power-Gard Technical Application (Littlefuse)
... terms of voltage, fuses may be rated for AC only, DC only, or both AC and DC. However, exceeding the voltage ratings or using an AC only fuse in a DC circuit could result in violent destruction of the fuse. ...
... terms of voltage, fuses may be rated for AC only, DC only, or both AC and DC. However, exceeding the voltage ratings or using an AC only fuse in a DC circuit could result in violent destruction of the fuse. ...
ILC LightMaster Specification Word Document
... maximum of 256. Each LightSync device shall have a unique address and shall be capable of being programmed to the applicable functions described in the Switched Input Types heading in this specification. Momentary push buttons are required to implement the momentary switch types and maintained switc ...
... maximum of 256. Each LightSync device shall have a unique address and shall be capable of being programmed to the applicable functions described in the Switched Input Types heading in this specification. Momentary push buttons are required to implement the momentary switch types and maintained switc ...
Power Distribution Systems
... distribution system in a building or an installation site is to receive power at one or more supply points and to deliver it to the individual lamps, motors and all other electrically operated devices. The importance of the distribution system to the function of a building makes it almost imperative ...
... distribution system in a building or an installation site is to receive power at one or more supply points and to deliver it to the individual lamps, motors and all other electrically operated devices. The importance of the distribution system to the function of a building makes it almost imperative ...
Transmission-Line Fault Analysis Using
... resistance, fault inception instance, etc.), ANN-based methods have been successful in detecting and classifying the faults, but they need a huge amount of training cases to achieve good performance. A combination of fuzzy set and wavelet transform method based on line current [6], while using simpl ...
... resistance, fault inception instance, etc.), ANN-based methods have been successful in detecting and classifying the faults, but they need a huge amount of training cases to achieve good performance. A combination of fuzzy set and wavelet transform method based on line current [6], while using simpl ...
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.