Embedded PIC Microcontroller Based Power Multimeter
... So this relay driver circuit is used to drive the relay using the +5V DC signal. Relay: Is a electromagnetic switch used to provide power supply to the motor through it. Alarm driver: A alarm operates on +12V DC. But the Microcontroller delivers +5V TTL signal. So this relay driver circuit is used t ...
... So this relay driver circuit is used to drive the relay using the +5V DC signal. Relay: Is a electromagnetic switch used to provide power supply to the motor through it. Alarm driver: A alarm operates on +12V DC. But the Microcontroller delivers +5V TTL signal. So this relay driver circuit is used t ...
Switch Yard Training Report NTPC Barh
... Bus bar are used to interconnect the loads and sources of electrical power . It connects incoming and outgoing transmission lines.It also connect generator and main transformer in power plant. Copper or Aluminium are generally used for busbar The bus bars of 400 kV switchyard are generally made up 4 ...
... Bus bar are used to interconnect the loads and sources of electrical power . It connects incoming and outgoing transmission lines.It also connect generator and main transformer in power plant. Copper or Aluminium are generally used for busbar The bus bars of 400 kV switchyard are generally made up 4 ...
Apparent Impedance of Ground Distance Relay using Variable Zero
... DISTANCE RELAYS The distance relay is a dual input relay viz. voltage and current and it operates such that it measures the positive sequence impedance of the faulted line. This is because the positive sequence component is the only common sequence component in all the types of faults. Therefore, th ...
... DISTANCE RELAYS The distance relay is a dual input relay viz. voltage and current and it operates such that it measures the positive sequence impedance of the faulted line. This is because the positive sequence component is the only common sequence component in all the types of faults. Therefore, th ...
CHAPTER 4
... help to imagine the spring that is part from the switch, but not shown on the symbol, tending the spring to press the moving contact down. Therefore, in the ‘normal’ position, the moving contact is down as far as it can go, whereas in the ‘actuated’ position, the contact is pushed up against the spr ...
... help to imagine the spring that is part from the switch, but not shown on the symbol, tending the spring to press the moving contact down. Therefore, in the ‘normal’ position, the moving contact is down as far as it can go, whereas in the ‘actuated’ position, the contact is pushed up against the spr ...
SUM 1001
... • The supply voltage is galvanically separated from the measurement circuit and is displayed via the LED "SUPPLY". • The measurand is recorded with an integrating full-wave rectification. With that, in certain limits, the monitoring of voltages, which are not sineshaped (e.g. voltages with a harmoni ...
... • The supply voltage is galvanically separated from the measurement circuit and is displayed via the LED "SUPPLY". • The measurand is recorded with an integrating full-wave rectification. With that, in certain limits, the monitoring of voltages, which are not sineshaped (e.g. voltages with a harmoni ...
Analog Annunciator Unit SACO 16 A3
... • A full choice of 26 standardized fieldselectable channel input signal types • Four alarm/trip levels per channel; two low set and two high set points • The last thirty events with time markings stored for local presentation • Bar graph, curve or numerical display of set and measured parameter valu ...
... • A full choice of 26 standardized fieldselectable channel input signal types • Four alarm/trip levels per channel; two low set and two high set points • The last thirty events with time markings stored for local presentation • Bar graph, curve or numerical display of set and measured parameter valu ...
CNT series Multifunction, Digital Time Delay Relay/Counter
... to secure CNT in panel mount applications. SSA-24C668 Protective Cover Clear, flexible cover slips snugly over bezel of CNT to help protect against dust and moisture. Durable cover also helps prevent inadvertant changes of programming switch settings. ...
... to secure CNT in panel mount applications. SSA-24C668 Protective Cover Clear, flexible cover slips snugly over bezel of CNT to help protect against dust and moisture. Durable cover also helps prevent inadvertant changes of programming switch settings. ...
Power system protection
... Modern high-speed circuit breakers operate in the range of 17 − 50ms, 1 − 3cysles; others operate at less than 83ms = 5cycles. Thus, the total clearing time (relays plus breaker) typically ranges from approximately 35 − 130ms = 2 − 8cycles In the lower-voltage systems, in which time-coordination is ...
... Modern high-speed circuit breakers operate in the range of 17 − 50ms, 1 − 3cysles; others operate at less than 83ms = 5cycles. Thus, the total clearing time (relays plus breaker) typically ranges from approximately 35 − 130ms = 2 − 8cycles In the lower-voltage systems, in which time-coordination is ...
Protection Fundamentals - Levine Lectronics and Lectric
... meter and control power flow • Reactors - to limit fault current (series) or compensate for charge current (shunt) • VT and CT - to measure primary current and voltage and supply scaled down values to P&C, metering, SCADA, etc. • Regulators - voltage, current, VAR, phase angle, etc. ...
... meter and control power flow • Reactors - to limit fault current (series) or compensate for charge current (shunt) • VT and CT - to measure primary current and voltage and supply scaled down values to P&C, metering, SCADA, etc. • Regulators - voltage, current, VAR, phase angle, etc. ...
Dynamic Testing of Generator Protection Using a Model Generator
... Saturation of main and relay CTs and switch-off transients are the main concerns when testing the stator differential protection. Particular attention must be paid to long-lasting external faults of small current magnitude but very long d.c. time constant. Small magnitude currents create small restr ...
... Saturation of main and relay CTs and switch-off transients are the main concerns when testing the stator differential protection. Particular attention must be paid to long-lasting external faults of small current magnitude but very long d.c. time constant. Small magnitude currents create small restr ...
Duke Energy System Protection Standard – Distribution
... protection scheme to return to a radial fed case. DER should not disconnect unnecessarily from the distribution system during over- and under-voltage and/or overand under-frequency excursions in the presence of a system wide fault or load flow event. However, de-sensitizing and/or removing this type ...
... protection scheme to return to a radial fed case. DER should not disconnect unnecessarily from the distribution system during over- and under-voltage and/or overand under-frequency excursions in the presence of a system wide fault or load flow event. However, de-sensitizing and/or removing this type ...
Arc detecting relay system
... With the normal version which disconnects the AC voltage on trip, there is no arc protection until the relay has been reset by pressing down the red button. A special version which does not disconnect the AC voltage on trip is available on order. When using this version the arc protection is restore ...
... With the normal version which disconnects the AC voltage on trip, there is no arc protection until the relay has been reset by pressing down the red button. A special version which does not disconnect the AC voltage on trip is available on order. When using this version the arc protection is restore ...
ABSTRACT: In this Paper, recently the demand for
... individual robots can still be achieved using a mouse or a joystick there is a one-to-one mapping between the joystick position and the robot velocity. Multi-robot systems require a much richer form of interaction. Instead of providing low-level control for individual robots, the user needs to provi ...
... individual robots can still be achieved using a mouse or a joystick there is a one-to-one mapping between the joystick position and the robot velocity. Multi-robot systems require a much richer form of interaction. Instead of providing low-level control for individual robots, the user needs to provi ...
- PAT tel doo
... In the standard configurations SPD type 2 / class II are used to protect the remote radio heads against surge voltage. SPD type 2 are capable of handling 40 kA (8/20 For lightning protection SPD type 1 + 2 / class I + II with coordinated spark gab technology are optional available. The current disch ...
... In the standard configurations SPD type 2 / class II are used to protect the remote radio heads against surge voltage. SPD type 2 are capable of handling 40 kA (8/20 For lightning protection SPD type 1 + 2 / class I + II with coordinated spark gab technology are optional available. The current disch ...
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.