AXICOM Latching Relays
... They have features like mechanical locks or gears inside keeping the contacts in the switching position. Mechanical latching relays are not very common in recent telecom and signal relay designs and can be disregarded ...
... They have features like mechanical locks or gears inside keeping the contacts in the switching position. Mechanical latching relays are not very common in recent telecom and signal relay designs and can be disregarded ...
00A Microcontroller Relay Switch with Pushbutton Control Lab
... to a fiberglass circuit board in quantities of 1, 2, 4, 8, and 16 relays. Each relay requires an individual input signal (in this case from the microcontroller). The relays also require a common ground (Vss) and an input voltage (5v will be used—supplied from Vdd of the Basic Stamp microcontroller). ...
... to a fiberglass circuit board in quantities of 1, 2, 4, 8, and 16 relays. Each relay requires an individual input signal (in this case from the microcontroller). The relays also require a common ground (Vss) and an input voltage (5v will be used—supplied from Vdd of the Basic Stamp microcontroller). ...
T2500 3 Phase Overcurrent and Short Circuit Relay
... • Visual indication of power, pick-up and relay tripping on both relays • High precision digital countdown timer for delayed output • Normal function upon loss of supply due to built-in energy source • Accepts high supply voltage variations: 60 - 110% • Cost effective and highly reliable compact de ...
... • Visual indication of power, pick-up and relay tripping on both relays • High precision digital countdown timer for delayed output • Normal function upon loss of supply due to built-in energy source • Accepts high supply voltage variations: 60 - 110% • Cost effective and highly reliable compact de ...
SSR - The Inside Story
... Solid state relays can be either ac or dc voltage controlled, for ac control the ac signal is rectified and filtered to provide dc to the opto-transistor or opto-triac LED. Obviously the ac control versions can also be dc controlled, just one half of the rectifier is used. Application Considerations ...
... Solid state relays can be either ac or dc voltage controlled, for ac control the ac signal is rectified and filtered to provide dc to the opto-transistor or opto-triac LED. Obviously the ac control versions can also be dc controlled, just one half of the rectifier is used. Application Considerations ...
Application Note
... Why Solid State Relays? Although there are advantages to using both types of relays, solid state relays are fast becoming the better choice in many applications, especially throughout the telecommunication and microprocessor control industries. The high reliability and long life mean less field fail ...
... Why Solid State Relays? Although there are advantages to using both types of relays, solid state relays are fast becoming the better choice in many applications, especially throughout the telecommunication and microprocessor control industries. The high reliability and long life mean less field fail ...
Relays and Motor Control - Community College of Allegheny County
... the circuits while solid state (SSR) relays use electronics. Additionally, protective relays help guard against damage within equipment and components through the identification of electrical abnormalities like reverse currents and overloads. Relays are used in a wide variety of applications such as ...
... the circuits while solid state (SSR) relays use electronics. Additionally, protective relays help guard against damage within equipment and components through the identification of electrical abnormalities like reverse currents and overloads. Relays are used in a wide variety of applications such as ...
Dia 1 - XAMK Moodle
... All systems shall at all times be of such construction as to prevent danger The voltage appearing on exposed conductive parts due to fault dangerous and the voltage must be removed as quickly as possible It cannot be removed instantaneously since protective devices need a finite time to operate ...
... All systems shall at all times be of such construction as to prevent danger The voltage appearing on exposed conductive parts due to fault dangerous and the voltage must be removed as quickly as possible It cannot be removed instantaneously since protective devices need a finite time to operate ...
PDF Version
... of the products of voltage and current. A torque was produced A definite time reverse power relay, type WCG, produced only in case of equal fundamental or harmonic. by GEC in 1988 is shown in Fig. 11. Differential Protection These relays could be used for earth-fault detection too. The successor was ...
... of the products of voltage and current. A torque was produced A definite time reverse power relay, type WCG, produced only in case of equal fundamental or harmonic. by GEC in 1988 is shown in Fig. 11. Differential Protection These relays could be used for earth-fault detection too. The successor was ...
20151112 SOTWG Item 08c TOP-09 R1 Tasks
... The total complement of Protection System(s) that function collectively to protect an Element. Backup protection provided by a different Element’s Protection System(s) is excluded. Element Any electrical device with terminals that may be connected to other electrical devices such as a generator, tra ...
... The total complement of Protection System(s) that function collectively to protect an Element. Backup protection provided by a different Element’s Protection System(s) is excluded. Element Any electrical device with terminals that may be connected to other electrical devices such as a generator, tra ...
Relay Testing and Maintenance
... The shape of the time-current curve is essentially a function of the electromagnet iron circuit. As the current through the coil is increased, the flux increases, thereby increasing the torque and thus decreasing the operating time. However, at some current level above pickup, the iron begins to sat ...
... The shape of the time-current curve is essentially a function of the electromagnet iron circuit. As the current through the coil is increased, the flux increases, thereby increasing the torque and thus decreasing the operating time. However, at some current level above pickup, the iron begins to sat ...
ECE 472 POWER SYSTEMS II EXPERIMENT 4 – WEEK 5 TIME-OVERCURRENT PROTECTION
... both a graphical representation and numerical data for your system. Record the phase rotation and note that the power factor is leading or lagging. Next, connect the normally open switch between phases A and B on the receiving-end of the transmission line and push down on the green button for only t ...
... both a graphical representation and numerical data for your system. Record the phase rotation and note that the power factor is leading or lagging. Next, connect the normally open switch between phases A and B on the receiving-end of the transmission line and push down on the green button for only 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.