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Analysis of integral snubber circuit design for transformers in urban high rise office building

Transformer failures have in recent years led to the development of Resistor-Capacitor snubber circuits for the protection of the transformer and winding insulation from the damaging effects of high-voltage high-frequency transients. Transformer insulation may be damaged if the Basic Insulation Leve...

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Main Author: Sutherland, P. E.
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Language:English
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description Transformer failures have in recent years led to the development of Resistor-Capacitor snubber circuits for the protection of the transformer and winding insulation from the damaging effects of high-voltage high-frequency transients. Transformer insulation may be damaged if the Basic Insulation Level (BIL) is exceeded, turn-to-turn insulation when there is excessive rate of change of voltage with time (dv/dt), and to switching devices by restrikes when the Transient Recovery Voltage (TRV) is exceeded. These transients are most often observed when dry-type transformers are close coupled to vacuum switching devices. Some manufacturers are now including snubbers in their transformer designs. This paper provides a thorough review of the causes of the transients, methods of analysis, and mitigation of the effects of these transients. An example is provided of transformers to be installed in the basement of an urban high rise office building, where the space is limited and the available fault current is high, where the transformer enclosure includes built-in snubber circuits. The strengths and weaknesses of current methods are examined. Recommendations are made for improvements in snubber circuit design and analysis.
doi_str_mv 10.1109/ICPS.2012.6229607
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E.</creator><creatorcontrib>Sutherland, P. E.</creatorcontrib><description>Transformer failures have in recent years led to the development of Resistor-Capacitor snubber circuits for the protection of the transformer and winding insulation from the damaging effects of high-voltage high-frequency transients. Transformer insulation may be damaged if the Basic Insulation Level (BIL) is exceeded, turn-to-turn insulation when there is excessive rate of change of voltage with time (dv/dt), and to switching devices by restrikes when the Transient Recovery Voltage (TRV) is exceeded. These transients are most often observed when dry-type transformers are close coupled to vacuum switching devices. Some manufacturers are now including snubbers in their transformer designs. This paper provides a thorough review of the causes of the transients, methods of analysis, and mitigation of the effects of these transients. An example is provided of transformers to be installed in the basement of an urban high rise office building, where the space is limited and the available fault current is high, where the transformer enclosure includes built-in snubber circuits. The strengths and weaknesses of current methods are examined. 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Recommendations are made for improvements in snubber circuit design and analysis.</description><subject>Cable insulation</subject><subject>Cable shielding</subject><subject>Conductors</subject><subject>Snubbers</subject><subject>Switches</subject><subject>Transformer failure</subject><subject>Transformer protection</subject><subject>Transformer snubber circuits</subject><subject>Transient analysis</subject><subject>Transient overvoltages</subject><subject>Transient rate of rise of voltage</subject><issn>2158-4893</issn><issn>2158-4907</issn><isbn>9781467306522</isbn><isbn>1467306525</isbn><isbn>9781467306515</isbn><isbn>1467306509</isbn><isbn>9781467306508</isbn><isbn>1467306517</isbn><fulltext>true</fulltext><rsrctype>conference_proceeding</rsrctype><creationdate>2012</creationdate><recordtype>conference_proceeding</recordtype><sourceid>6IE</sourceid><recordid>eNpVkMtqwzAURNUXNKT5gNKNfsDp1ZWsxzKENg0EWmj2RpZlR8VRimQv8vc1NF10NjNwmFkMIY8MloyBed6uPz6XCAyXEtFIUFdkYZRmQioOsmTlNZkhK3UhDKibfwzx9o9pw-_JIucvmKRKxkHNSLWKtj_nkOmppSEOvku2pzmOde0TdSG5MQy08Tl0kbanRIdkY57C0ac8FeiYahvpIXQHmkL200wbnKf1GPomxO6B3LW2z35x8TnZv77s12_F7n2zXa92RTAwFELaEhp0XDoAKbhpdAkCmHRaulpo79AyNL61HFEYI5luwSJwK4wyIPicPP3OBu999Z3C0aZzdXmL_wBNelkQ</recordid><startdate>201205</startdate><enddate>201205</enddate><creator>Sutherland, P. 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E.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-i90t-46a50d2c36c006439d8504016c86cb48ec2a129efa322499618f0a203a4979043</frbrgroupid><rsrctype>conference_proceedings</rsrctype><prefilter>conference_proceedings</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Cable insulation</topic><topic>Cable shielding</topic><topic>Conductors</topic><topic>Snubbers</topic><topic>Switches</topic><topic>Transformer failure</topic><topic>Transformer protection</topic><topic>Transformer snubber circuits</topic><topic>Transient analysis</topic><topic>Transient overvoltages</topic><topic>Transient rate of rise of voltage</topic><toplevel>online_resources</toplevel><creatorcontrib>Sutherland, P. E.</creatorcontrib><collection>IEEE Electronic Library (IEL) Conference Proceedings</collection><collection>IEEE Proceedings Order Plan (POP) 1998-present by volume</collection><collection>IEEE Xplore All Conference Proceedings</collection><collection>IEEE Electronic Library Online</collection><collection>IEEE Proceedings Order Plans (POP) 1998-present</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Sutherland, P. E.</au><format>book</format><genre>proceeding</genre><ristype>CONF</ristype><atitle>Analysis of integral snubber circuit design for transformers in urban high rise office building</atitle><btitle>48th IEEE Industrial &amp; Commercial Power Systems Conference</btitle><stitle>ICPS</stitle><date>2012-05</date><risdate>2012</risdate><spage>1</spage><epage>17</epage><pages>1-17</pages><issn>2158-4893</issn><eissn>2158-4907</eissn><isbn>9781467306522</isbn><isbn>1467306525</isbn><eisbn>9781467306515</eisbn><eisbn>1467306509</eisbn><eisbn>9781467306508</eisbn><eisbn>1467306517</eisbn><abstract>Transformer failures have in recent years led to the development of Resistor-Capacitor snubber circuits for the protection of the transformer and winding insulation from the damaging effects of high-voltage high-frequency transients. Transformer insulation may be damaged if the Basic Insulation Level (BIL) is exceeded, turn-to-turn insulation when there is excessive rate of change of voltage with time (dv/dt), and to switching devices by restrikes when the Transient Recovery Voltage (TRV) is exceeded. These transients are most often observed when dry-type transformers are close coupled to vacuum switching devices. Some manufacturers are now including snubbers in their transformer designs. This paper provides a thorough review of the causes of the transients, methods of analysis, and mitigation of the effects of these transients. An example is provided of transformers to be installed in the basement of an urban high rise office building, where the space is limited and the available fault current is high, where the transformer enclosure includes built-in snubber circuits. The strengths and weaknesses of current methods are examined. 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identifier ISSN: 2158-4893
ispartof 48th IEEE Industrial & Commercial Power Systems Conference, 2012, p.1-17
issn 2158-4893
2158-4907
language eng
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source IEEE Xplore All Conference Series
subjects Cable insulation
Cable shielding
Conductors
Snubbers
Switches
Transformer failure
Transformer protection
Transformer snubber circuits
Transient analysis
Transient overvoltages
Transient rate of rise of voltage
title Analysis of integral snubber circuit design for transformers in urban high rise office building
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