132KV Current Transformer Outdoor Oil Immersed Single Phase

132kv current transformer outdoor oil immersed single phase 132kv current transformer outdoor oil immersed single phase used for the electric current measurement, energy measurement and relay protection in the electric power system with a rated voltage of 132kV. Live tank: In live tank current...

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132kv current transformer outdoor oil immersed single phase

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132kv current transformer outdoor oil immersed single phase used for the electric current measurement, energy measurement and relay protection in the electric power system with a rated voltage of 132kV.

Live tank: In live tank current transformers, the main core of the transformer is placed in the top tank. The top tank also houses the secondary winding which is termed as ‘live’part of the transformer  body. Before placing them inside the tank, which is typically made of mild steel, the core and secondary winding is insulated with various types of insulating material to protect it from high voltage current.

Dead tank: The primary winding in a dead tank CT is insulated similarly to other current transformers and is then brought down to the bottom tank where it is earthed. Further, the primary is made to pass through  an insulated porcelain. In Dead tank CTs, the length of the primary conductor decides the mechanical force exerted on the transformer when it is exposed to short time dynamic current. It is therefore important to increase  the length of the primary conductor to ensure that there is no damage to the transformer when it is exposed to high currents.


Product Name

132kv current transformer outdoor oil immersed single phase

Brand Name

HYEE

Origin

Dalian, China

Phase

Single

Coil Structure

Wound

Coil Number

1-6

Color

Brown/White

Frequency

50/60Hz

Certification

ASTA/CTQC/IEC/SGS/ISO9001

Package

Wooden Carton

Delivery Time:

30 days


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Difference between Live Tank and Dead Tank type CT:

Sr. No.

Live Tank CT

Dead Tank CT

1)     

In live tank CT, the core with the secondary winding is housed    in the top tank which is LIVE.(AT HIGH VOLTAGE)

In dead tank CT, the core and secondary winding is housed in the    bottom tank which is earthed or DEAD.

2)     

In Live Tank, the core and secondary winding is insulated against    the high voltage and housed in the top live tank.

In Dead Tank CT, the primary winding is brought down to the bottom    tank and it is insulated from the earthed tank and cores.

3)     

In Live Tank CT, we insulate the core and secondary winding.

In Dead Tank CT, we insulate the primary winding.

4)     

Only after application of pre-defined insulation on secondary,    primary is wound. Application of insulation over wound cores is easy.

It is practically difficult to apply the pre-defined insulation    over the primary because the primary needs to pass through the wound cores.

5)     

Insulation is robust and reliable.

Insulation is not robust.

6)     

Primary winding is of shortest possible length and its natural    shape offers high strength against the short time current dynamic forces.

The primary has to pass through the porcelain insulator and the    larger length of the primary conductor produces maximum mechanical force during short time dynamic current which might damage the insulation.

7)     

Heat generated during short time thermal current is the minimum    as primary copper volume is minimum and the heat dissipation is fast as the primary copper is directly in contact with transformer oil.

Heat generated during short time thermal current is maximum. Copper    volume is maximum and the heat dissipation is slow as the heat need to conduct through the major insulation which is normally a bad conductor of heat.

8)     

The transformer is compact and economical.

The transformer is bulky and costly.

9)     

Primary winding is uniformly distributed around Core, Hence CT    is truly low reactance type, which has inherent better transient performance.

10)  

As the length of Primary inside the CT is less (so resistance will    be less), the heat produced in the primary will be less.

As the length of Primary is more (so resistance will be more) compared    to Live Tank type CT, the heating will be more.

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Rated voltage, kV

132/138

Highest voltage for equipment, kV

145

Rated frequency, Hz

50; 60

Rated power frequency withstand voltage, kV

275

Rated lightning impulse voltage, kV

650

Flashover distance, mm

1100

Cree. distance, mm

W1:2900,W2:3630,W3:4500

Mechanical load, N

4000

Rated primary current, A

1~2500

Rated secondary current, A

1;2;5

Accuracy class

0.1; 0.2; 0.5; 0.2S; 0.5S; 0.5S; 5P; 10P; PX…

Rated output(recommended value), VA

1A: 10~50 VA

2A: 10~50 VA

5A: 15~50VA

Instrument security factor  FS

5; 10

Accuracy limit factors  ALF

10; 15; 20; 25; 30; 40

Short-time thermal current (Maximum), kA

40kA/3s


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