This technical report refers to the electrical protection of all 132kV switchgear. These settings may be re-evaluated during the commissioning, according to actual and measured values. Protection selectivity is partly considered in this report and could be also re-evaluated. Names of parameters in this calculation may differ from those in appropriate device.

## Technical Data of the Lines

##### Main Line

Conductor Type | ACSR Lynx |

Length | 27.8 km |

Type | ZM Type Tower |

Positive sequence impedance | 0.1583 + j0.4004 (0.431 ∠68.4°) Ω/ km |

Zero sequence impedance | 0.3246 + j1.228 (1.27 ∠75.2°) Ω/ km |

Current capacity (A) | 487 |

##### Next Line

Conductor Type | ACSR Lynx |

Length | 36 km |

Type | ZM Type Tower |

Positive sequence impedance | 0.1583 + j0.4004 (0.431 ∠68.4°) Ω/ km |

Zero sequence impedance | 0.3246 + j1.228 (1.27 ∠75.2°) Ω/ km |

Current capacity (A) | 487 |

**Protection Settings Calculations for Lines**

**SEL-311C Distance Protection Settings**

Distance Zone

Non-Homogeneous Correction Angle

Load Impedance and Load Encroachment

Power Swing Detection/ Out of Step Detection

Switch on to Fault (SOTF)

Fuse failure scheme OR Loss of Potential (LOP)

**SEL-351A Back-up Over Current Settings**

Back up over current settings

## Technical Data of the Power Transformers

##### Transformers – 1

Type of cooling | ONAN / ONAF |

Vector Group | Dyn11 |

Rated Voltage HV V | 132000 |

Rated Voltage LV (V) | 11500 |

Full Load current HV ( A) | 87.48 / 113.72 |

Full Load current LV (A) | 1004.12 / 1305.35 |

Rated Power ( MVA) | 20 / 26 |

% impedance at normal tap (12 no.) | 10.15% / 13.20 % |

Type of tap changer | On load |

Voltage at maximum tap (V) | 145200 |

Voltage at minimum tap (V) | 118800 |

##### Transformers – 2

Type of cooling | ONAN / ONAF |

Vector Group | Dyn11 |

Rated Voltage HV V | 132000 |

Rated Voltage LV (V) | 11500 |

Full Load current HV ( A) | 43.7 / 56.9 |

Full Load current LV (A) | 502 / 652.7 |

Rated Power ( MVA) | 10 / 13 |

% impedance at normal tap (12 no.) | 10.15% / 13.20 % |

Type of tap changer | On load |

Voltage at maximum tap (V) | 145200 |

Voltage at minimum tap (V) | 118800 |

**Protection Settings Calculations for Power Transformers**

**SEL-787 Transformer Differential Protection**

Differential Pick-up

Slope-1 Setting

Slope-2 Setting

Differential Unrestrained (U87P (Un-restrained Differential Pick-up) )

2nd HARMONIC

5th HARMONIC

**SEL-351A Transformer HV Over Current**

Pick-up Setting

51PP (for phase fault element)

51GP (for earth fault element)

Time Multiplier Setting

### 11kV Outgoing Protection Settings

SEL-551C LT Over-Current and Earth Fault

CDG21 LT Neutral Standby AC series Earth Fault

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