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Trenntransformatoren und galvanische Isolatoren


Trenntransformatoren und galvanische Isolatoren sorgen dafür, den PE-Leiter im bordeigenen Wechselstrom-Netz von der Landerde zu trennen. Dadurch wird elektrolytischer Korrosion vorgebeugt, die im besten Fall die Opferanoden zersetzt und im schlimmsten Fall Welle und Propeller angreift (bzw. bei Schiffen aus Metall den Rumpf). 

Trenntransformatoren sind teurer und aufwändiger. Dafür sind sie zuverlässiger und haben den Vorteil, dass sie ein polarisiertes Bordnetz ermöglichen, selbst wenn der Landstrom verpolt ist. Galvanische Isolatoren sind deutlich günstiger, haben aber die im Kasten unten beschriebenen Nachteile.

Expertenwissen: Trenntransformator

Transformatoren werden aus zwei Gründen eingesetzt: Zur galvanischen Trennung von Landstrom- und Bordnetz zwecks Vermeidung von elektrochemischer Korrosion und zur Polarisierung des Wechselstrombordnetzes. Sie bestehen aus einem Eisenkern, auf den – zählt man die Schirmwicklung mit – drei Spulen aus isoliertem Kupferdraht gewickelt sind. Fließt durch die Primärwicklung ein Wechselstrom, entsteht in der Spule ein alternierendes Magnetfeld. Dies wird durch den Eisenkern – der durch das Magnetfeld magnetisiert wird – in die Sekundärwicklung übertragen, in der es wiederum durch Induktion eine Spannung erzeugt. Das Verhältnis der Spannungen in Primär- und Sekundärwicklung entspricht dem Verhältnis der Windungszahlen. Sind diese gleich, ist die Spannung an der Sekundärseite gleich der an der Primärseite.

Trenntransformatoren sind mit einer Schirmwicklung versehen, damit bei einem Isolationsfehler der Primärwicklung keine Netzspannung auf den Kern oder die Sekundärwicklung übertragen werden kann. Die Schirmwicklung und der Kern werden mit dem landseitigen Schutzleiter verbunden. Der bordseitige Schutzleiter wird mit einem Pol der Sekundärwicklung verbunden, der somit zum Neutralleiteranschluss wird. So besteht keine Verbindung zwischen dem landseitigen und dem bordseitigen Schutzleiter.

Expertenwissen: Galvanische Isolatoren

Galvanische Isolatoren dürfen seit einigen Jahren eingesetzt werden, um eine gleichstrommäßige Trennung von Land- und Bordschutzleiter zu schaffen und somit die Gefahr von galvanischen Strömen – die elektrolytische Korrosion verursachen können – zu bannen. Sie bestehen aus zwei antiparallel geschalteten Dioden und sind somit für Wechselstrom in beide Richtungen durchlässig. Für kleine Gleichspannungen, die unter der Schleusenspannung der Dioden liegen (circa 1,6 bis 4 Volt), ist der Durchlass in beide Richtungen gesperrt. Galvanische Isolatoren müssen kurzzeitig einen Strom von 5.000 Ampere (im Falle eines Kurzschlusses) überstehen können. Es gibt jedoch zurzeit noch keine galvanischen Isolatoren, die mit einer adäquaten Funktionsüberwachung ausgestattet sind. Im Fehlerfall lassen sie bestenfalls Gleichströme durch, schlimmstenfalls sperren sie in beide Richtungen und unterbrechen so den Schutzleiter.

Diese Infobox ist ein Auszug aus "Elektrik auf Yachten" von Michael Herrmann. Das hervorragende Fachbuch behandelt sämtliche Fragestellungen zum Thema Strom an Bord. Die aktuelle Ausgabe gibt es direkt beim Autor als E-Book (PDF).

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SAMLEX - Galvanischer Isolator, GI 64
SAMLEX - Galvanischer Isolator, GI 64
SAMLEX - Galvanischer Isolator – 64 A – AC-AC – GI 64

€311.17* €327.55* (5% saved vs. recommended price)
previously €311.17*

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Samlex - Galvanian Insulation, GI 32
Samlex - Galvanian Insulation, GI 32
Samlex - Galvanian insulation - 32 a - AC -AC - GI 32

€245.32* €258.23* (5% saved vs. recommended price)
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Samlex - Galvanian Insolator GI 16
Samlex - Galvanian Insolator GI 16
SAMLEX - Galvanischer Isolator – 16 A – AC-AC – GI 16

€107.40* €113.05* (5% saved vs. recommended price)
previously €107.40*

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Victron - Separation Transformer 3600 W - Auto
Victron - Separation Transformer 3600 W - Auto
With automatic 115/230 Volt Input Switching· Safety and prevention of galvanic corrosion. With an isolation transformer full galvanic isolation between ship and shore power is achieved. It increases security, makes galvanic isolators unnecessary and prevents polarity problems.· Safety is taken for granted in power grids on land. If a short circuit or a ground fault a fuse by or a ground fault circuit interrupter (GFCI) burns disconnects the circuit. The connection of the grounding line of the shore connection with the metal parts of the vessel results, as described below, to galvanic corrosion. If the ground wire is omitted and only the phase and neutral are out on board, all mentioned fuses on board are ineffective and there is no short-circuit protection more.· Galvanic corrosion occurs when two dissimilar metals that are electrically connected to each other in a conductive liquid (an electrolyte), such as Seawater or lesser extent, fresh water are submerged.· It is a mistake to assume that galvanic corrosion can occur only in metal and aluminum hulls. In reality, it affects all ships when metal parts such as the propeller shaft and the outer skin or metallic feedthroughs with water come into contact, and the ship is grounded via the shore connection. It may be tempting to forego be the land connection to the protective conductor: this is however extremely for the persons on board, because the guards will not appeal (see above) more dangerous.· Soft start function and an inrush current limiter is a given at Victron isolation transformer so that problems can be avoided with high inrush currents.· Isolation transformer 3600 W with automatic Eingagsumschaltung· Input voltage 115/230 V with automatic 115/230 volt switching *· Output voltage 115/230 V *· Frequency 50/60 Hz· Performance 32/16 A· Soft start yes· Transformer type Toroidal (low noise, low weight)· Input protection yes· Housing material: aluminum, protection class IP21· Weight 24 kg· Dimensions (HxWxD): 362 x 258 x 218 mm* Suitable for the following stress conditions: 230 V / 230 V, 115 V / 115 V, 115 V / 230 V, 230 V / 115 V

€909.40* €1,069.81* (14.99% saved vs. recommended price)
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Philippi - Separation Transformer Type RTR 3600
Philippi - Separation Transformer Type RTR 3600
Isolation transformerType RTR 3600 115-230 // 230installed in the housing, incl. inrushand input voltage switchingS / N @

€1,357.40* €1,429.00* (5.01% saved vs. recommended price)
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Philippi - Separation Transformer Type RTR3600-230 // 115V
Philippi - Separation Transformer Type RTR3600-230 // 115V
Separation transformer Type RTR3600-230 // 115Vinstalled in the housing, including switch -on power limitationS/n @

€1,116.40* €1,175.00* (4.99% saved vs. recommended price)
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Philippi - Separation Transformer Type RTR3600-230 // 230V
Philippi - Separation Transformer Type RTR3600-230 // 230V
Isolation Transformer Type RTR3600-230 // 230installed in the housing, incl. inrushS / N @

€1,116.40* €1,175.00* (4.99% saved vs. recommended price)
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6 in stock

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Philippi - Galvanian Istor
Philippi - Galvanian Istor
Galvanic isolator AC 16A, Type Gi 16

€109.40* €115.00* (4.87% saved vs. recommended price)
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7 in stock

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Victron - Galvanian isolator VDI -16 - 16A
Victron - Galvanian isolator VDI -16 - 16A
According to CE-Richtilinien, the state protection manager must be connected to the negative direct current of your yacht.This means that the saildrive, engine, valves and much more are almost automatically connected to the land protection manager. Due to the connection between the protective conductor and the negative direct current, there can be a galvanic balance between the neighboring yacht, the marina or other buildings in the water and its yacht.If your ship is protected with anodes, these are used up. The installation of a galvanic insulator reduces zinc consumption.The insulator is connected between the land connection and 230 V electrical system.Maximum electricity 16 A.Housing made of anodized aluminum, waterproof in epoxy, protection class IP 67.Weight 1 kg, dimensions (LXBXH): 200 x 120 x 60 mm.

€118.40* €139.23* (14.96% saved vs. recommended price)
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VICTRON - isolating transformer 3600 W
VICTRON - isolating transformer 3600 W
· Safety and prevention of galvanic corrosion. With an isolation transformer full galvanic isolation between ship and shore power is achieved. It increases security, makes galvanic isolators unnecessary and prevents polarity problems.· Safety is taken for granted in power grids on land. If a short circuit or a ground fault a fuse by or a ground fault circuit interrupter (GFCI) burns disconnects the circuit. The connection of the grounding line of the shore connection with the metal parts of the vessel results, as described below, to galvanic corrosion. If the ground wire is omitted and only the phase and neutral are out on board, all mentioned fuses on board are ineffective and there is no short-circuit protection more.· Galvanic corrosion occurs when two dissimilar metals that are electrically connected to each other in a conductive liquid (an electrolyte), such as Seawater or lesser extent, fresh water are submerged.· It is a mistake to assume that galvanic corrosion can occur only in metal and aluminum hulls. In reality, it affects all ships when metal parts such as the propeller shaft and the outer skin or metallic feedthroughs with water come into contact, and the ship is grounded via the shore connection. It may be tempting to forego be the land connection to the protective conductor: this is however extremely for the persons on board, because the guards will not appeal (see above) more dangerous.· Soft start function and an inrush current limiter is a given at Victron isolation transformer so that problems can be avoided with high inrush currents.· Isolation transformer 3600 W· Input and output voltage 115/230 V *· Frequency 50/60 Hz· Performance 32/16 A· Soft start yes· Transformer type Toroidal (low noise, low weight)· Input protection yes· Housing material: aluminum, protection class IP21· Weight 23 kg· Dimensions (HxWxD): 362 x 258 x 218 mm* Suitable for the following stress conditions: 230 V / 230 V, 115 V / 115 V, 115 V / 230 V, 230 V / 115 V

€805.90* €948.43* (15.03% saved vs. recommended price)
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VICTRON - isolating transformer 2000 W
VICTRON - isolating transformer 2000 W
· Security and prevention of galvanic corrosion. A complete galvanic separation between the ship and the land network is achieved with a separator. It increases security, makes galvanic isolators superfluous and prevents polarity problems.· Safety is assumed in land grid on land as a matter of course. In the event of a short circuit or an ground error, a melting fuse burns through or an residual current circuit breaker (FI control switch) separates the circuit. The connection of the land line of the land connection with the metal parts of the ship, as described below, lead to galvanic corrosion. If the earth ladder is omitted and only the phase and the zero conductor are led on board, all the fuses mentioned on board are ineffective and there is no longer any short circuit protection.· Galvanic corrosion always arises when two different metals that are electrically conductively connected to each other are immersed in a conductive liquid (an electrolyte) such as sea water or polluted fresh water.· A mistake can be assumed that galvanic corrosion can only occur in aluminum or steel ships. In reality, it affects all ships as soon as metal parts such as the propeller and the shaft or metal outer skin implementations come into contact with water, and the ship is grounded via the land connection. It may be tempting to do without the protective conductor in the land connection: However, this is extremely dangerous for the people on board, since the protective devices then no longer appeal (see above).· Soft Start Function or a switch-on power limiter is a matter of course for the Victron separator that is avoided so that problems with high switch-on flows are avoided.Separation transformer 2000 WInput and output voltage 115/230 V *Frequency 50/60 HzPerformance 17/8.5 aSoft start yesTransformer type ring core (low noise level, low weight)Input securing yesHousing material: aluminum, protection class: IP21Weight 10 kgDimensions (HXBXT): 375 x 214 x 110 mm* Usable for the following tension: 230 V / 230 V, 115 V / 115 V, 115 V / 230 V, 230 V / 115 V

€572.40* €673.54* (15.02% saved vs. recommended price)
previously €572.40*

will be ordered for you

%
Philippi - Separation Transformer RTR 36 115 // 230
Philippi - Separation Transformer RTR 36 115 // 230
Separation transformer RTR with a housing made of seawater-resistant aluminum and plastic coating for the galvanic separation of the electrical system from the land network and to adapt the input or output voltage of your electrical network. With insignificance limitation.RTR 25: 2500 W continuous performance, weight 21 kgRTR 36: 3600 W continuous performance, weight 27 kgDimensions: L 410 x W 290 x H 170

€1,167.40* €1,229.00* (5.01% saved vs. recommended price)
previously €1,167.40*
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