Insulation Coordination is critical for minimizing costs and disruptions caused by insulation failures, ensuring they remain within economically and operationally acceptable limits. It plays a key role in verifying the correct rating and placement of lightning arresters in substations to maintain the required protective margin.
SEN EDS utilizes the DIgSILENT software package, supported by a comprehensive library of IEEE HV Engineering resources, to perform Insulation Coordination Studies for both AIS and GIS substations up to 400kV. Our expert services are available throughout Tamil Nadu, delivering optimal solutions for enhanced substation performance.
About Insulation Coordination
The main objective of the Insulation Coordination Study is to align the insulation levels of switchgear equipment with the protection measures. Overvoltage events such as cable energization, re-energization, fault application/clearing, and capacitor bank switching are carefully analyzed in the study to determine the appropriate size and placement of surge arresters.
The modeling and analysis follow the guidelines of IEC 60071 and the IEEE standard “Modelling Guidelines for Switching Transients,” as outlined by the Switching Transients Task Force of the IEEE Modelling and Analysis of System Transients Working Group. The network is precisely modeled, including all equipment stray capacitance values, to ensure accurate results.
- Insulation Coordination is a systematic process aimed at determining the optimal insulation levels for various components in a power system network. This involves the careful selection of insulation structures capable of withstanding expected voltage stresses on the system or equipment, along with the appropriate choice of surge arresters. The primary goal is to verify the adequacy of insulation levels for cables, gas-insulated switchgear (GIS) equipment, and transformers. This validation considers voltage stresses resulting from actions such as conductor switching (energization/re-energization), transformer operations, and fault occurrences.
- Our services across Tamil Nadu ensure that your substations are protected against insulation failures, delivering long-term performance and reliability.
Insulation Coordination Methodology
- Temporary Overvoltage (TOV):
- Short Duration Power Frequency Withstand Voltage Study:
- Unsymmetrical Cable Faults
- Lightning Overvoltage
Theoretical Background Analysis
- Shielding Failure
- Back Flashover
