Protector
... Does not operate without grounding. Is sensitive up to 12 V between zero and grounding. Is very expensive. Disconnects all the home appliances from the mains. ...
... Does not operate without grounding. Is sensitive up to 12 V between zero and grounding. Is very expensive. Disconnects all the home appliances from the mains. ...
Function Of Starter
... In this method, 3-phase auto transformer with fixed tappings is used to obtain reduced voltage for starting the 3-phase induction motors. Normally 50% to 60% tappings can be used to obtain a safe value of starting current. Thus, 50% to 60% of the rated voltage is applied at starting and the auto tra ...
... In this method, 3-phase auto transformer with fixed tappings is used to obtain reduced voltage for starting the 3-phase induction motors. Normally 50% to 60% tappings can be used to obtain a safe value of starting current. Thus, 50% to 60% of the rated voltage is applied at starting and the auto tra ...
FEEDER PROTECTION SySTEM Economical and compact feeder
... cable and equipment insulation to break down, resulting in ground faults. Ground faults can be detected by either from the residual connection of the phase CTs or from the zero sequence CT. The FM2 can trigger a trip or an alarm if the ground fault pickup level is exceeded. A time delay may be enter ...
... cable and equipment insulation to break down, resulting in ground faults. Ground faults can be detected by either from the residual connection of the phase CTs or from the zero sequence CT. The FM2 can trigger a trip or an alarm if the ground fault pickup level is exceeded. A time delay may be enter ...
Summit 3208 GLD - Hotronic
... The Summit 3208GLD allows for up to four different telephone numbers to be programmed into the system. Up to 16 digits can be programmed for each telephone number. An additional number can be used in conjunction with the remote programming call back feature. The Summit 3208GLD supports either pulse ...
... The Summit 3208GLD allows for up to four different telephone numbers to be programmed into the system. Up to 16 digits can be programmed for each telephone number. An additional number can be used in conjunction with the remote programming call back feature. The Summit 3208GLD supports either pulse ...
Switching System - Market Central Inc
... The R6150 Ganged A/B Switching System is a 1U high 19 inch rack style gang switch that supports 5 RJ45 switch ports. The 5 RJ45 switch ports are ganged, meaning that they are controlled together. They may be controlled with the front panel toggle switch, or via a remote external toggle switch or ext ...
... The R6150 Ganged A/B Switching System is a 1U high 19 inch rack style gang switch that supports 5 RJ45 switch ports. The 5 RJ45 switch ports are ganged, meaning that they are controlled together. They may be controlled with the front panel toggle switch, or via a remote external toggle switch or ext ...
TYPE AKD-8 Low-Voltage Switchgear High Resistance Pulsing
... below one ampere, so that the resistor is usually set at 0.9 ampere, with an increase to 3.6 ampere during pulsing. For unusually large systems, taps are available for an initial ground current of 3.6 amps with pulsing to 7.3 amperes. Refer to Fig. 2 for typical system circuit elementary. ...
... below one ampere, so that the resistor is usually set at 0.9 ampere, with an increase to 3.6 ampere during pulsing. For unusually large systems, taps are available for an initial ground current of 3.6 amps with pulsing to 7.3 amperes. Refer to Fig. 2 for typical system circuit elementary. ...
Fault Analysis
... • The AC current flowing in the generator during the sub-transient period is called the sub-transient current and is denoted by I”. The time constant of the sub-transient current is denoted by T” and it can be determined from the slope. This current can be as much as 10 times the steady-state fault ...
... • The AC current flowing in the generator during the sub-transient period is called the sub-transient current and is denoted by I”. The time constant of the sub-transient current is denoted by T” and it can be determined from the slope. This current can be as much as 10 times the steady-state fault ...
ARCAT spec 262600 2009-9-15
... NOTICE: The specification guidelines in this document are intended to aid in the specification of products. Specific installations have specific requirements, and Rockwell Automation does not recommend or intend any specific application based solely upon the guidelines provided here. Because of the ...
... NOTICE: The specification guidelines in this document are intended to aid in the specification of products. Specific installations have specific requirements, and Rockwell Automation does not recommend or intend any specific application based solely upon the guidelines provided here. Because of the ...
NRF Series Circuit Protectors - Flexi
... manually turning OFF, make sure that the current is not applied (under no-load condition). ...
... manually turning OFF, make sure that the current is not applied (under no-load condition). ...
Advantages of Solid-State Relays Over Electro
... The contacts are the most important components in an EMR in terms of reliability. Their characteristics are significantly affected by factors such as the material of the contacts, the voltage and current values applied to them, the type of load, operating frequency, atmosphere, contact arrangement, ...
... The contacts are the most important components in an EMR in terms of reliability. Their characteristics are significantly affected by factors such as the material of the contacts, the voltage and current values applied to them, the type of load, operating frequency, atmosphere, contact arrangement, ...
DIP SWITCH ADJUSTMENT Multifunction timer ZMR , ZMRS, ZMRV
... timing functions and 8 different timing intervals in one unit. The function and timing intervals can be adjusted with DIP switches on the front panel of the relay. The multi-function timer can operate on either AC or DC voltage using two separate connections. For a 230V AC power supply use the termi ...
... timing functions and 8 different timing intervals in one unit. The function and timing intervals can be adjusted with DIP switches on the front panel of the relay. The multi-function timer can operate on either AC or DC voltage using two separate connections. For a 230V AC power supply use the termi ...
Overload Relays
... Class 11 - 3RV manual starters and switches provide control for machinery that does not require remote start-stop control. Class 11 - 3RV switches provide control for motors where overload protection is not required or is provided separately. Class 11 - 3RV manual starters are used for single and th ...
... Class 11 - 3RV manual starters and switches provide control for machinery that does not require remote start-stop control. Class 11 - 3RV switches provide control for motors where overload protection is not required or is provided separately. Class 11 - 3RV manual starters are used for single and th ...
USB-ERB08 - Measurement Computing
... The PWR LED turns on when 9 V power is supplied to the USB-ERB08. If the voltage supply is less than 6.0 V or more than 12.5 V, the PWR LED does not turn on. Do not connect external power to the POWER OUT connector The power connector labeled POWER OUT on the enclosure (PWR OUT on the board) is used ...
... The PWR LED turns on when 9 V power is supplied to the USB-ERB08. If the voltage supply is less than 6.0 V or more than 12.5 V, the PWR LED does not turn on. Do not connect external power to the POWER OUT connector The power connector labeled POWER OUT on the enclosure (PWR OUT on the board) is used ...
Monitoring Relays 3-Phase, 3-Phase+N, Multi
... (and neutral) DPB71 operates when all 3 phases are present at the same time, the phase sequence is correct and the phase-phase (or phase-neutral) voltage levels are within set limits. If one or more phase-phase or phase-neutral voltages exceeds the upper set level or drops below the lower set level, ...
... (and neutral) DPB71 operates when all 3 phases are present at the same time, the phase sequence is correct and the phase-phase (or phase-neutral) voltage levels are within set limits. If one or more phase-phase or phase-neutral voltages exceeds the upper set level or drops below the lower set level, ...
multiple input and output modules 500 series
... an external power supply or amplifier to operate, such as horns, strobes, speakers or bells. Upon command from the control panel, the SC-6 will disconnect the supervision and connect the external power supply across the load device. The first module is addressed from 01 to 94, while the remaining mo ...
... an external power supply or amplifier to operate, such as horns, strobes, speakers or bells. Upon command from the control panel, the SC-6 will disconnect the supervision and connect the external power supply across the load device. The first module is addressed from 01 to 94, while the remaining mo ...
Electrical Protection Methods and Devices
... • explain how the fire (rating) integrity of a structure shall be maintained in relation to the electrical installation • describe the hazards associated with mechanical movement associated with electric motors and the measures taken to mitigate the hazard • define the terms “direct contact” and ...
... • explain how the fire (rating) integrity of a structure shall be maintained in relation to the electrical installation • describe the hazards associated with mechanical movement associated with electric motors and the measures taken to mitigate the hazard • define the terms “direct contact” and ...
series rated combinations
... situation, both the upstream and the downstream devices will open. The simultaneous opening of both devices introduces impedance into the circuit, which reduces the let-through energy to a value that can be safely cleared. It is this added impedance that allows a lower rated device to be safely used ...
... situation, both the upstream and the downstream devices will open. The simultaneous opening of both devices introduces impedance into the circuit, which reduces the let-through energy to a value that can be safely cleared. It is this added impedance that allows a lower rated device to be safely used ...
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.