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info hunter

Posts: 44
Joined: Jul 2010
03-10-2010, 12:54 PM


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project report helper
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Posts: 2,270
Joined: Sep 2010
12-10-2010, 05:47 PM

.ppt   TRNSFORMER PROTECTION.ppt (Size: 41 KB / Downloads: 151)

Prepared by: MUHAMMAD ALI 10-M.Sc-EE-32

Protection Schemes
Protection Schemes

Percentage Differential Protection
Over current protection
Protection against magnetizing Inrush Current
Oil pressure relief Devices
Over Current Relays
Over fluxing Protection
Protection of Three winding Transformer

Types of Faults in Transformer

Internal Faults
Short circuiting in Transformer windind and Connections
Incipient faults
Core Faults
Regulator Faults

External Faults

Over loading

Percentage Differential Protection

Employed for Large Power transformer
Protect internal short circuits
A transformer is provided with on-load tap changing gear .The C.T. ratio is fixed.
When transformer is on-load, there is no-load current in the relay, Therefore, its setting should be greater than no-load current

Buchholz Relay

Gas actuated relay
Detects incipient faults
Buchholz Relay gives an alarm when a specific amount of gas is formed.
C2 H2 and H2 shows arcing in oil between constructed parts
CH4 , C2H4 and H2 indicates hot spot in insulation

Oil Pressure Relief devices

It is fragile disc.
It operates when the pressure exceeds 10 psi but close automatically when the pressure falls below the critical level.
Employed for large transformer of rating
2 MVA.
Employed for Distribution transformer of
200 kVA

Over current Relays

Protect transformer of rating 100 kVA and below 5 MVA.
Used as overload and fault protection.

Over fluxing Protection

Magnetic flux increases when voltage increases.
Reduction in frequency also increases the flux density.
= E K/f
= flux, f = frequency, E = applied voltage, K = constant
Therefore, to control flux, the ratio E/f is controlled. When E/f exceeds unity, it has to be detected.

Protection of Three winding Transformer

One of winding is connected to the source of supply.
Two windings feed loads at different voltages.
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Joined: Oct 2012
08-10-2012, 12:39 PM

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