ELG3331: DESIGN OF LOGIC CIRCUIT Define the problem Write
... We translate the word statements into logic-like statements. Activate the relay if either or both switches are on. In such case, the output should be zero. This means that enough current (15 mA) will flow through the relay and RC. When both inputs are zero, the relay should not operate and the outpu ...
... We translate the word statements into logic-like statements. Activate the relay if either or both switches are on. In such case, the output should be zero. This means that enough current (15 mA) will flow through the relay and RC. When both inputs are zero, the relay should not operate and the outpu ...
Solid-State RelayS
... • Highest open-circuit voltage VOC and short-circuit current ISC combination in the industry • Ambient operating temperature from –40 °C to +100 °C • Certified by key international safety regulatory agencies such as UL, CUL, and VDE • Through-hole and surface mount DIP-8 packages • Pure tin lea ...
... • Highest open-circuit voltage VOC and short-circuit current ISC combination in the industry • Ambient operating temperature from –40 °C to +100 °C • Certified by key international safety regulatory agencies such as UL, CUL, and VDE • Through-hole and surface mount DIP-8 packages • Pure tin lea ...
120V/277V Relay Module
... For use with the following A21 120V/277V Lighting Control Panels: A21 3-Space Panel, A21 6-Space Panel, A21 9-Space Panel ...
... For use with the following A21 120V/277V Lighting Control Panels: A21 3-Space Panel, A21 6-Space Panel, A21 9-Space Panel ...
NeoSwitch - Dual Tech Low Voltage Wall Switch Sensor Spec Sheet
... universally recognized light icon pushbutton. Each relay can be set independently to Automatic On Mode or Manual On Mode. The sensor includes self-adaptive technology that continuously self-adjusts sensitivity and time delay in real-time, maximizing the potential energy savings that are available in ...
... universally recognized light icon pushbutton. Each relay can be set independently to Automatic On Mode or Manual On Mode. The sensor includes self-adaptive technology that continuously self-adjusts sensitivity and time delay in real-time, maximizing the potential energy savings that are available in ...
PSR-SxF/URM/4X1/2X2
... engineer. In the event of an error, replace the device immediately. Repairs, especially if the housing must be opened, may only be carried out by the manufacturer or authorized persons. Otherwise the warranty is invalidated. According to EN 50205, only one N/O contact and one N/C contact may be used ...
... engineer. In the event of an error, replace the device immediately. Repairs, especially if the housing must be opened, may only be carried out by the manufacturer or authorized persons. Otherwise the warranty is invalidated. According to EN 50205, only one N/O contact and one N/C contact may be used ...
REG670 Generator Protection Relay – Commissioning Guide Anders Hermans
... much load somewhere in the power system. By studying the change in voltage and current, the protective relay can supervise and protect the power system and its devices. (Andersson, L. et al. , 2012, p 274; Blackburn, J.A., et al., 2007, p 8) ...
... much load somewhere in the power system. By studying the change in voltage and current, the protective relay can supervise and protect the power system and its devices. (Andersson, L. et al. , 2012, p 274; Blackburn, J.A., et al., 2007, p 8) ...
Line Protection with Overcurrent Relays
... circuits in electric utility and in industrial systems, and on some subtransmission lines where the cost of distance relaying cannot be justified. It is used for primary ground-fault protection on most transmission lines where distance relays are used for phase faults, and for ground back-up protect ...
... circuits in electric utility and in industrial systems, and on some subtransmission lines where the cost of distance relaying cannot be justified. It is used for primary ground-fault protection on most transmission lines where distance relays are used for phase faults, and for ground back-up protect ...
unparalleled protection - I-Gard
... High-resistance grounding resistor This resistor is connected to the wye point of the transformer or generator supplying the facility. Its function is to limit ground fault currents to non-damaging levels under a single line-to-ground fault condition. This provides the user an opportunity to retain ...
... High-resistance grounding resistor This resistor is connected to the wye point of the transformer or generator supplying the facility. Its function is to limit ground fault currents to non-damaging levels under a single line-to-ground fault condition. This provides the user an opportunity to retain ...
716 Output Expansion Module
... 1. DMP recommends using 18 or 22-gauge unshielded wire for all keypad and LX-Bus circuits. Do not use twisted pair or shielded wire for LX-Bus and keypad bus data circuits. All 22-gauge wire must be connected to a power-limited circuit and jacket wrapped. 2. On keypad bus circuits, to maintain auxil ...
... 1. DMP recommends using 18 or 22-gauge unshielded wire for all keypad and LX-Bus circuits. Do not use twisted pair or shielded wire for LX-Bus and keypad bus data circuits. All 22-gauge wire must be connected to a power-limited circuit and jacket wrapped. 2. On keypad bus circuits, to maintain auxil ...
SPi-OCEF - Fundamentals Ltd
... distribution network. Indication is by a flashing LED and electrical output contacts. The device does not require a battery. ...
... distribution network. Indication is by a flashing LED and electrical output contacts. The device does not require a battery. ...
BSPM1275TN(R) / BSPM1320TN(R) / BSPM1385TN(R) / BS
... Class II single-pole surge arrester models are offered with MCOV ratings of 255, 275, 320, 385, 440 and 600 volts. TN System Arresters The features of these single-pole devices are for use as a single device or in combination with other devices. TT System Arrester Provides a current arresting means ...
... Class II single-pole surge arrester models are offered with MCOV ratings of 255, 275, 320, 385, 440 and 600 volts. TN System Arresters The features of these single-pole devices are for use as a single device or in combination with other devices. TT System Arrester Provides a current arresting means ...
Determination and Application of Practical Relaying
... When the study to establish the original loadability parameters was performed, it was based on the 4-hour facility rating. The intent of the 150% factor applied to the Facility Rating in the loadability requirement was to approximate the 15-minute rating of the transmission line and add some additio ...
... When the study to establish the original loadability parameters was performed, it was based on the 4-hour facility rating. The intent of the 150% factor applied to the Facility Rating in the loadability requirement was to approximate the 15-minute rating of the transmission line and add some additio ...
Sample Paper Two partitioned (1)
... 7) Diversity and maximum demand should be determined before beginning an installation a) for a reliable and cost effective design b) because the customer must be provided with the information c) in order that the correct supply rating is used d) as it is an REC requirement 8) When assessing the gen ...
... 7) Diversity and maximum demand should be determined before beginning an installation a) for a reliable and cost effective design b) because the customer must be provided with the information c) in order that the correct supply rating is used d) as it is an REC requirement 8) When assessing the gen ...
88974134 - Crouzet
... RBT (Removable Terminal Blocks) versions : verify the maximum current according to the type of connection used Utilization category DC-12 : 24 V, 1.5 A Utilization category DC-13 : 24 V (L/R = 10 ms), 0.6 A Utilization category AC-12 : 230 V, 1.5 A Utilization category AC-15 : 230 V, 0.9 A 12 A for ...
... RBT (Removable Terminal Blocks) versions : verify the maximum current according to the type of connection used Utilization category DC-12 : 24 V, 1.5 A Utilization category DC-13 : 24 V (L/R = 10 ms), 0.6 A Utilization category AC-12 : 230 V, 1.5 A Utilization category AC-15 : 230 V, 0.9 A 12 A for ...
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.