Class-A Trip
... Turbine is tripped first, followed by the generator, through LFP / RP interlock. Trapped steam is allowed to do useful work as long as possible & when it is confirmed that the Stop Valve is closed fully/near fully, the generator is tripped. The closure of the Stop valve verified by the magnitude of ...
... Turbine is tripped first, followed by the generator, through LFP / RP interlock. Trapped steam is allowed to do useful work as long as possible & when it is confirmed that the Stop Valve is closed fully/near fully, the generator is tripped. The closure of the Stop valve verified by the magnitude of ...
Sepam sales promotion package
... Phase overcurrent and earth fault protection shall have an adjustable timer hold to allow restriking faults detection. Earth fault protection shall integrate a harmonic 2 restraint, which can be inhibited or activated. Alternative overcurrent setting groups will be selectable by logical conditions t ...
... Phase overcurrent and earth fault protection shall have an adjustable timer hold to allow restriking faults detection. Earth fault protection shall integrate a harmonic 2 restraint, which can be inhibited or activated. Alternative overcurrent setting groups will be selectable by logical conditions t ...
7_Armando-Maldonado_7
... Relay Protection, voltage and current inputs at one end of transmission line. ...
... Relay Protection, voltage and current inputs at one end of transmission line. ...
Protection, Control, and Automation System for a
... Overcurrent element 51S4 is set to operate on the maximum phase current IW. Overcurrent element 51S5 is set to operate on the maximum phase current IX. This essentially sets up two non-directional overcurrent elements that look at the line current each breaker sees in the substation. As mentioned ab ...
... Overcurrent element 51S4 is set to operate on the maximum phase current IW. Overcurrent element 51S5 is set to operate on the maximum phase current IX. This essentially sets up two non-directional overcurrent elements that look at the line current each breaker sees in the substation. As mentioned ab ...
Aquarium Lighting and Resource Monitor
... Thermistor Utilizes 10kΩ variable resistor which changes resistance with the temperature Measure into ADC using another 10kΩ resistor as a voltage divider Based on the Steinhart-Hart equation it is converted into degrees Fahrenheit ...
... Thermistor Utilizes 10kΩ variable resistor which changes resistance with the temperature Measure into ADC using another 10kΩ resistor as a voltage divider Based on the Steinhart-Hart equation it is converted into degrees Fahrenheit ...
Commonly Used Electrical Symbols
... Identifies the drawout circuit breaker represented by the symbol as a 1200 ampere circuit breaker. Indicates the fixed circuit breaker represented by the symbol as a 225 ampere, 3-pole breaker. Indicates that the transformer represented by the symbol is connected “Delta-Wye.” ...
... Identifies the drawout circuit breaker represented by the symbol as a 1200 ampere circuit breaker. Indicates the fixed circuit breaker represented by the symbol as a 225 ampere, 3-pole breaker. Indicates that the transformer represented by the symbol is connected “Delta-Wye.” ...
Chapter 5 Electrical Motor Controls
... 7. What is the typical amperage rating of a reed switch? .25 - .5 amps (google it) 8. Why is DC typically used for the magnetism of a reed switch circuit? Reed switch is so fast it could energize and de-energize on half cycles of 60 Hz AC 9. In a bias arrangement for a reed switch how many magnets a ...
... 7. What is the typical amperage rating of a reed switch? .25 - .5 amps (google it) 8. Why is DC typically used for the magnetism of a reed switch circuit? Reed switch is so fast it could energize and de-energize on half cycles of 60 Hz AC 9. In a bias arrangement for a reed switch how many magnets a ...
INSTALLATION INSTRUCTIONS Macromatic Industrial Controls Inc.
... 3. Set the low-profile selector switch to “ALTERNATE” for normal operation. In this mode, the unit will operate as a normal Alternating Relay, alternating between the two loads on each subsequent closing and open of the control switch. Setting the selector switch to either “LOAD 1” or LOAD 2” will l ...
... 3. Set the low-profile selector switch to “ALTERNATE” for normal operation. In this mode, the unit will operate as a normal Alternating Relay, alternating between the two loads on each subsequent closing and open of the control switch. Setting the selector switch to either “LOAD 1” or LOAD 2” will l ...
Switches & Relays
... A small current is passed though the coil which generates a magnetic field. This magnetic field pulls the armature down towards the coil. At the end of the armature is a contact. When the armature moves its contact touches the contact of the controlled circuit. This creates a closed circuit. (this i ...
... A small current is passed though the coil which generates a magnetic field. This magnetic field pulls the armature down towards the coil. At the end of the armature is a contact. When the armature moves its contact touches the contact of the controlled circuit. This creates a closed circuit. (this i ...
White Paper on Installing and Maintaining Protective Relay Systems
... Although failure of a protective relay system may have severe local or regional impacts, most protective relay systems are not required to operate to prove they are in working order. Ensuring that protection systems operate reliably is crucial, and a good preventive maintenance program ensures that ...
... Although failure of a protective relay system may have severe local or regional impacts, most protective relay systems are not required to operate to prove they are in working order. Ensuring that protection systems operate reliably is crucial, and a good preventive maintenance program ensures that ...
To read a diagram, we must understand a circuit. Here is Dictionary
... The numbers correspond with wires in the motor. The lines going to them from outside the circle are wires coming from the control box, or going to the brake. The start windings are numbers 8 and 5. The diagram should show a connection between the two as they are connected by a motor centrifugal sta ...
... The numbers correspond with wires in the motor. The lines going to them from outside the circle are wires coming from the control box, or going to the brake. The start windings are numbers 8 and 5. The diagram should show a connection between the two as they are connected by a motor centrifugal sta ...
4 Status Relay Output
... • Single Pole Double Throw (SPDT) contacts offer normally open or normally closed options • Output state is jumper programmable with one of four selections on SH402 on driver board • Relay contacts are fused at 2 Amps to protect the internal generator circuitry The Status Relay Output is a circuit b ...
... • Single Pole Double Throw (SPDT) contacts offer normally open or normally closed options • Output state is jumper programmable with one of four selections on SH402 on driver board • Relay contacts are fused at 2 Amps to protect the internal generator circuitry The Status Relay Output is a circuit b ...
Relay bases-00 for web.P65
... The B312NL has been designed to provide interfacing between a Series 300 detector and 12V security control panels that do not provide a reset facility, as the relay base is self-resetting. Therefore, the relay base will automatically reset the Series 300 detector when a fire alarm condition no longe ...
... The B312NL has been designed to provide interfacing between a Series 300 detector and 12V security control panels that do not provide a reset facility, as the relay base is self-resetting. Therefore, the relay base will automatically reset the Series 300 detector when a fire alarm condition no longe ...
Industrial Automation System
... used. Relays are used where it is necessary to control a circuit by a low-power signal (with complete electrical isolation between control and controlled circuits), or where several circuits must be controlled by one signal. Relays were used extensively in telephone exchanges and early computers to ...
... used. Relays are used where it is necessary to control a circuit by a low-power signal (with complete electrical isolation between control and controlled circuits), or where several circuits must be controlled by one signal. Relays were used extensively in telephone exchanges and early computers to ...
Bus Protection - GE Grid Solutions
... To prevent differential-relay operation should a CT open-circuit, the relay pickup is often made no less than about twice the load current of the most heavily loaded circuit; 8 if the magnitude of groundfault current is sufficiently limited by neutral-grounding impedance, lower pickup may be require ...
... To prevent differential-relay operation should a CT open-circuit, the relay pickup is often made no less than about twice the load current of the most heavily loaded circuit; 8 if the magnitude of groundfault current is sufficiently limited by neutral-grounding impedance, lower pickup may be require ...
26 10 00 mv protective relay 7ut613
... The overload protection shall be provided and can function with or without thermal input. The ground differential (restricted ground fault) shall be capable of either low or high impedance protection. The relay shall provide functionality that allows for RTD inputs for measuring external equipment t ...
... The overload protection shall be provided and can function with or without thermal input. The ground differential (restricted ground fault) shall be capable of either low or high impedance protection. The relay shall provide functionality that allows for RTD inputs for measuring external equipment t ...
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.