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Marshalling box in a transformer

Question asked by Arp in #Coffee Room on Jan 5, 2011
Arp
Arp · Jan 5, 2011
Rank C3 - EXPERT
can someone please elaborate about marshalling box in a transformer?
it is having RTD(or thermocouples) for measurement of oil and winding temperatue only or something else also? Posted in: #Coffee Room
Arp
Arp · Jan 5, 2011
Rank C3 - EXPERT
please reply it..
vibhor_one
vibhor_one · Jan 8, 2011
Rank C3 - EXPERT
Marshalling box is a kind of panel which is situated next to transformer, it contains OTI or oil temperature indicator, WTI or winding temperature indicator, heater switch, pump control switch, fan control switch, mcb and contractors.

Let me know, if other queries rises in your mind.
Arp
Arp · Jan 9, 2011
Rank C3 - EXPERT
what is heater switch?
for what heater is used
and tell me some also about contractors?
vibhor_one
vibhor_one · Jan 9, 2011
Rank C3 - EXPERT
heater switch is used to dry heat process in which the moisture that is trapped inside the transformer is eliminated and contractors are terminal points in the panel box....
Arp
Arp · Jan 10, 2011
Rank C3 - EXPERT
thanks marshalling box is now clear
will you please also tell about oil surge relay in the transformer?
vibhor_one
vibhor_one · Jan 18, 2011
Rank C3 - EXPERT
[FONT="]It has only one float & operates when oil surges reach and strike the float of OSR. It is used with OLTC for detection of any damage or fault inside the tap changer and prevents tap changer from damages in case of low oil level in OLTC tank.[/FONT]
Hisham Bulushi
Hisham Bulushi · Oct 29, 2018
Rank E1 - BEGINNER

What about the connection in the marshalling box ? How WTI and OTI connected and mcb is it used for tripping purpose in case and of OTI and WTI heats up?

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