relay abb

ANY Timer Rrelay
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Protective Relaying: Theory and Applications (No Series)

Targeting the latest microprocessor technologies for more sophisticated applications in the field of power system short circuit detection, this revised and updated source imparts fundamental concepts and breakthrough science for the isolation of faulty equipment and minimization of damage in power system apparatus. The Second Edition clearly describes key procedures, devices, and elements crucial to the protection and control of power system function and stability. It includes chapters and expertise from the most knowledgeable experts in the field of protective relaying, and describes microprocessor techniques and troubleshooting strategies in clear and straightforward language.

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zaid asked How Can we test the diff relay characteristic?

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 relay abb perform really effectively with different applications which are certain to energy distribution and protection. The relays come with wide adjustment ranges using a scale that is definitely simple to study either in three or four digits as outlined by the model. These relay abb assist in escalating the flexibility of the applications, minimize the overall power and upkeep charges. You will find relays that are used for common purposes which are available in trustworthy designs with rapid replacement solutions. And there are actually models which are utilised for industrial applications and heavier duty applications that operate on big loads. These products are made to meet the lifetime industrial control requirements of the applications.
Their most current merchandise will be the Time counter, Timer Delay, relay abb, Fast Connect Couplings, Electronic Motor Couplings, Aluminum Couplings, Morse Couplings and various other people. The internet site presents a detailed description of each and every model in numerous categories of relay abb couplings and sensors. These products are particularly helpful for high-risk applications. The relay abb are also obtainable with functions like many timing ranges and functions. The corporation is presently trying to find agents and dealers who can promote and sell their factory created goods. They may be normally on a lookout for creating new and more dependable products according to the demands and needs on the sector.

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