This document provides an overview of the key components of a 220kV substation in Dhandari Kalan-1, including cables, a 100MVA power transformer manufactured by ABB with specifications listed, lightening arrestors installed on each phase, vacuum and SF6 circuit breakers, isolators, a capacitor bank, the earthing system consisting of a buried conductor grid, and a wave trap for communication between substations. The document was authored by Gursimran Singh, an EEE student with roll number 1914787.

1. SWITCHGEAR(220 KV)
SUBSTATION
DHANDARI KALAN-1
BY- GURSIMRAN SINGH( EEE )
ROLL NO.- 1914787

2. OVERVIEW
 CABLE
 POWER TRANSFORMER
 LIGHTENING ARRESTER
 CIRCUIT BREAKER
 ISOLATOR
 CAPACITOR BANK
 EARTHING
 WAVE TRAP

3. CABLES

4. POWER
TRANSFORMER
Principle of operation:
Mutual Inductance
Losses in Transformer:
• Copper Loss
• Core loss
Hysteresis loss
Eddy current loss

5. POWER TRANSFORMER
220/66KV
DHANDARI KALAN-1

6. SPECIFICATION OF THE POWER
TRANSFORMER
Manufactured by ABB
Voltage Ratio- 220/66 KV
Class OF/AF Transformer
Rating- 100 MVA

7. LIGHTENING ARRESTOR ( THYRITE
TYPE)
Thyrite type Lightening
arrester consist of:
Series spark gap
Non- linear resistor
disc in series
(These discs are of
15cm diameter and19
mm thickness)

8. LIGHTENING ARRESTER INSTALLED AT EACH
PHASE AT 220 KV SUB STATION, DHANDARI
KALAN-1

9. CIRCUIT BREAKER
Vacuum circuit breaker
Are quenching medium- vacuum
voltage range- 3.3- 33 KV
breaking capacity - 250-2000 MVA
SF6 Circuit Breaker
ARC quenching medium – SF6 gas at 5kg pressure
Voltage range- 3.3- 765 KV
Breaking capacity- 1000- 50,000 MVA

10. ISOLATOR
Isolators are employed only for isolating
circuit when the current has already
been interrupted.
They operate under no load conditions
and are employed on both the side of
the circuit breaker.
Isolator consist of insulator posts
mounted on a support.
 There are fixed and moving contacts
each made of aluminium.

11. CAPACITOR BANK

12. EARTHING AT 220 KV SUB
STATION,
DHANDARI KALAN-1
The earthing system consist of an array of conductors
buried horizontally at the depth of 0.5m Such earthing is
called an earthing grid or earth mat.
The main steps in the design of the earthing grid are as
under:
1.Selection of material and size of the conductor of the
grid.
2. Arrangement of the grid conductors.CC
3. Connections to the grid.

13. WAVE TRAP
It is the effort to utilize the same transmission line
between two substations for the purpose of
communication.
It does the trapping of high frequency communication
signals.
Itv is relevant in PLCC system for communication
among various sub stations.
The wave trap offers high impedance to the high
frequeny communication signals.

14. WAVE TRAP INSTALLED AT 220KV SUB
STATION
DHANDARI KALAN-1

15. THANK YOU