Zobrazeno 1 - 10
of 20
pro vyhledávání: '"Stanley E. Zocholl"'
Autor:
Stanley E. Zocholl, Gabriel Benmouyal
Publikováno v:
IEEE Transactions on Power Delivery. 20:1240-1246
Standards specify an equation for the time-current characteristic of a thermal relay. When the equation is published without reference to its derivation, it may be mistaken for the characteristic of an inverse-time overcurrent relay which if implemen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0e5b320efb70ef5f0c0862e5ef92721f
https://doi.org/10.1109/tpwrd.2004.841304
https://doi.org/10.1109/tpwrd.2004.841304
Publikováno v:
IEEE Transactions on Power Delivery. 17:886-893
For pt.I see ibid., vol.16, p.485-91 (2001). This paper describes a new approach for transformer differential protection that ensures security for external faults, inrush, and overexcitation conditions and provides dependability for internal faults.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1eb732e419f061ac88e113298bfacc46
https://doi.org/10.1109/tpwrd.2002.803736
https://doi.org/10.1109/tpwrd.2002.803736
Publikováno v:
49th IEEE/IAS Industrial & Commercial Power Systems Technical Conference.
The thermal model providing motor overload protection is derived from the first order differential equation for heat rise due to current in a conductor. Only the stator thermal time constant and the service factor are the required settings. The therm
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0d14f5bcb9e97eccf820a433fe299327
https://doi.org/10.1109/icps.2013.6547350
https://doi.org/10.1109/icps.2013.6547350
Publikováno v:
2010 63rd Annual Conference for Protective Relay Engineers.
Two drastically different types of differential relays, one with a single set of very high-impedance inputs and another with multiple sets of low-impedance inputs, are available for bus differential protection. Protection engineers often question whi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3ffd3ba91e57d6befe6ab31665eea22f
https://doi.org/10.1109/cpre.2010.5469509
https://doi.org/10.1109/cpre.2010.5469509
Autor:
David Costello, Stanley E. Zocholl
Publikováno v:
2009 62nd Annual Conference for Protective Relay Engineers.
High-impedance bus differential relays have been applied successfully for decades. These relays are preferred for many reasons, including their speed, security, and ease of setting and wiring, as well as the high number of breakers that can be includ
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::570128c5ac492aaacbe3a99ed753959b
https://doi.org/10.1109/cpre.2009.4982532
https://doi.org/10.1109/cpre.2009.4982532
Autor:
Stanley E. Zocholl
Publikováno v:
2007 60th Annual Conference for Protective Relay Engineers.
The thermal limitations of induction motors are specified by thermal limit curves that are plots of the limiting temperature of the rotor and stator in units of I2t. This paper discusses the thermal protection provided by rotor and stator thermal mod
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eb07229be1b654432bbef0ae3329b60b
https://doi.org/10.1109/cpre.2007.359899
https://doi.org/10.1109/cpre.2007.359899
Autor:
Stanley E. Zocholl
Publikováno v:
2006 Record of Conference Papers - IEEE Industry Applications Society 53rd Annual Petroleum and Chemical Industry Conference.
The thermal limitations of induction motors are specified by thermal limit curves that are plots of the limiting temperature of the rotor and stator in units of l2t. This paper discusses the thermal protection provided by rotor and stator thermal mod
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4ea75db53c4bada39b6f4a491e790592
https://doi.org/10.1109/pcicon.2006.359713
https://doi.org/10.1109/pcicon.2006.359713
Autor:
Stanley E. Zocholl
Publikováno v:
59th Annual Conference for Protective Relay Engineers, 2006..
This paper shows the consequences of low accuracy ratings and analyzes the relay response for fault currents in the range of 25 kA to 50 kA, using the CT accuracy rating from the relay data acquisition. To ensure proper relaying performance, the user
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::35392bf95e176b16b15bd3912c4654fb
https://doi.org/10.1109/cpre.2006.1638702
https://doi.org/10.1109/cpre.2006.1638702
Autor:
Stanley E. Zocholl
Publikováno v:
59th Annual Conference for Protective Relay Engineers, 2006..
Induction motors require thermal protection to prevent overheating to cyclic as well as steady state overloads. This paper discusses the problem that occurred while a customer was testing the motor relay that trip prematurely when subjected to cyclic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::12ca8aca9c1938d87afd31d303c21fcd
https://doi.org/10.1109/cpre.2006.1638698
https://doi.org/10.1109/cpre.2006.1638698
Autor:
Joseph B. Mooney, Stanley E. Zocholl
Publikováno v:
57th Annual Conference for Protective Relay Engineers, 2004.
This paper serves as one of few references describing primary high-current testing of protective relays using low ratio current transformers. Accurate measurement of high-current magnitudes requires high ratio current transformers. However, it is the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8e9e0cc7050448bf8eeb085e0920bff2
https://doi.org/10.1109/cpre.2004.238491
https://doi.org/10.1109/cpre.2004.238491