Helpful protective relay for High-Risk Applications
Reliable protective relay Styles for Industrial and Industrial Applications
CHINA – ?¡ãAny Electronics?¡À proudly presents their entire range of protective relay . They offer a complete set of protective relay merchandise and also other interrelated merchandise. These units are observed in distinctive applications such as industrial applications, industrial control circuits along with OEM Panels. These devices come with excellent precision and repeatability. The common protective relay that happen to be developed lately demand incredibly little panel space.
ge protective relays
protective relay training
Siemens 3TK28 26-2BB41 Safety Relay, For Emergency Stop and Protective Doors, Selectable Parameters, Spring Loaded Terminals, 45mm Width 45mm Width, 24VDC Rated Voltage
There was an error connecting to the Amazon web service, or no results were found for your query.
I Know there are equations for each diff relay ! but i have a problem how can i test the diff characteristic depending on those equations ?
And got the following answer:
It's always great to see answers from people who have no idea about the art and science of protective relaying... While the specific equations of your current differential relay will be given in the manufacturer's manual, you can still determine its major characteristics without the manual. Current differential relays use the concept of measuring the current flowing into and out of a device, and determining how much of that current is 'lost'. If this difference in current is excessive, the relay trips the breaker to de-energize the circuit(s). Usually, the discrimination is a percentage of the current flowing into the protected equipment, e.g. a 15% setting would trip for a difference or current 'loss' above that level. Since there may be measurement uncertainty, especially at low current levels, it is common for the trip characteristic to require a definite non-zero amount of difference current before tripping. (You wouldn't want a transformer differential to trip on magnetizing branch current.) Likewise, for tremendous levels of difference current, the relay may use an altered characteristic to provide faster tripping, or more security, depending on the application. The manufacturers usually provide very detailed descriptions of their relays. Look for ABB, Siemens, Schweitzer Engineering Labs (selinc.com), GE-Multilin. I would start by hooking up two 3-phase sets of current sources (the test set) to the relay and shoot a little current in it. Gradually increase the differential current until it trips. Do the same for higher "through" currents, and on the other phases. With enough testing, you will determine the characteristic. The manual will help you get the testing set up correctly. If you don't have a dual 3-phase test set, it may be possible to test the relay with a single-phase set, but only for a small number of the possible current differential relay configurations. Voltage differential relays work on basically the same principle, but they are limited in application. High impedance bus differential relays are a very different form of current differential relay. They rely on the saturation characteristics of matched sets of CTs to detect if a fault is within the bus protected zone (trip) or outside the zone (no-trip). These Hi-Z bus diff relays are basically over-voltage relays with a few extra features. Check with the engineer before twiddling...
The protective relay operate particularly effectively with various applications which might be particular to energy distribution and protection. The relays include wide adjustment ranges using a scale that is easy to read either in three or 4 digits based on the model. These protective relay help in escalating the flexibility with the applications, decrease the general power and upkeep charges. You’ll find relays which are made use of for common purposes which come in trustworthy designs with quick replacement selections. And there are actually models that happen to be utilised for industrial applications and heavier duty applications that function on big loads. These goods are made to meet the lifetime industrial handle requirements from the applications.
Their most recent merchandise would be the Time counter, Timer Delay, protective relay, Swift Connect Couplings, Electronic Motor Couplings, Aluminum Couplings, Morse Couplings and different other people. The website gives a detailed description of each and every model in numerous categories of protective relay couplings and sensors. These solutions are particularly helpful for high-risk applications. The protective relay are also out there with options like various timing ranges and functions. The company is currently in search of agents and dealers who can promote and sell their factory produced items. They’re normally on a lookout for developing new and more trustworthy merchandise based on the requirements and specifications of the business.