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Deprecated: Return type of Wikimedia\Rdbms\IResultWrapper::key() should either be compatible with Iterator::key(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/2/m/mjwiki/www/w/includes/libs/rdbms/database/resultwrapper/IResultWrapper.php on line 75

Deprecated: Return type of Wikimedia\Rdbms\ResultWrapper::valid() should either be compatible with Iterator::valid(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/2/m/mjwiki/www/w/includes/libs/rdbms/database/resultwrapper/ResultWrapper.php on line 117

Deprecated: Return type of Wikimedia\Rdbms\ResultWrapper::rewind() should either be compatible with Iterator::rewind(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/2/m/mjwiki/www/w/includes/libs/rdbms/database/resultwrapper/ResultWrapper.php on line 90

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Deprecated: Return type of MediaWiki\Session\PHPSessionHandler::destroy($id) should either be compatible with SessionHandlerInterface::destroy(string $id): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/2/m/mjwiki/www/w/includes/session/PHPSessionHandler.php on line 368

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Deprecated: Return type of MediaWiki\Session\Session::rewind() should either be compatible with Iterator::rewind(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/2/m/mjwiki/www/w/includes/session/Session.php on line 649

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Deprecated: Return type of & MediaWiki\Session\Session::offsetGet($offset) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/2/m/mjwiki/www/w/includes/session/Session.php on line 678

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Deprecated: Return type of MediaWiki\Session\Session::offsetUnset($offset) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/2/m/mjwiki/www/w/includes/session/Session.php on line 693

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Deprecated: Return type of FSFileBackendList::valid() should either be compatible with Iterator::valid(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/2/m/mjwiki/www/w/includes/libs/filebackend/FSFileBackend.php on line 941

Deprecated: Return type of FSFileBackendList::rewind() should either be compatible with Iterator::rewind(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/2/m/mjwiki/www/w/includes/libs/filebackend/FSFileBackend.php on line 927

Deprecated: Return type of RemexHtml\Tokenizer\PlainAttributes::offsetExists($key) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/2/m/mjwiki/www/w/vendor/wikimedia/remex-html/RemexHtml/Tokenizer/PlainAttributes.php on line 24

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Deprecated: Return type of RemexHtml\Tokenizer\LazyAttributes::offsetUnset($offset) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/2/m/mjwiki/www/w/vendor/wikimedia/remex-html/RemexHtml/Tokenizer/LazyAttributes.php on line 51

Deprecated: Return type of RemexHtml\Tokenizer\LazyAttributes::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/2/m/mjwiki/www/w/vendor/wikimedia/remex-html/RemexHtml/Tokenizer/LazyAttributes.php on line 83

Warning: Trying to access array offset on value of type null in /home/2/m/mjwiki/www/w/includes/profiler/SectionProfiler.php on line 99

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Polvender – MJwiki

Polvender

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En polvender er en 2-polet bryter eller 2-polet relé som skifter om polariteten på en elektrisk 2-leder.

En polvender er nyttig til flere ting på et MJ-anlegg:

Skifte kjøreretningen på analoge likestrømslokomotiver.
Skifte kjøreretningen på et isolert sporavsnitt på 2-skinnebaner i forbindelse med vendesløyfe eller trekantspor.
Skifte omleggingsretning på sporvekselmotorer av Tortoise-typen.

Prinsippskisser for 2-polede brytere/releer og hvordan de kobles for polvending

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