Testing and Commissioning

Preliminary information 

In most of the cases the project of the construction of a new substation must be submitted before any further detailed studies to the approval of the utility operating the MV network that will feed the substation. The list of information to provide for this approval may be the result of preliminary discussions with the utility. Among all information, the following are generally required:

Maximum anticipated power (kVA) demand 

The method of evaluation of this parameter is detailed in section Power loading of an installation, it must take into account the future additional loads. As described there, two factors associated to the loads are used in the proposed method:

  • The factor of maximum utilization (ku)
  • The diversity factor (ks).

Layout and arrangement drawings of the proposed substation 

The following information may be required:

  • Situation of the substation with regard to traffic lane
  • Location of the substation inside the installation
  • Dispositions foreseen for the unrestricted access of the utility operating staff
  • Arrangement drawings showing clearly the location of the electrical equipment (MV Switchboard, transformers, Metering panel,…)
  • Routing of MV cables
  • Single line diagram and type of protections against phase to phase and phase to earth faults
  • Main characteristics of electrical equipment
  • Solution foreseen for the compensation of the reactive energy
  • Principle of the earthing system
  • Presence in the installation of a power generator operated in parallel with the MV network
  • Etc.

Degree of supply continuity required 

The consumer must estimate the consequences of a failure of supply in terms of:

  • Safety of the persons
  • Impact on the environment
  • Safety of the installation
  • Loss of production.

He shall indicate to the utility the acceptable frequency of the interruptions of the electricity and their durations.

Commissioning, testing, energizing 

When required by the local authority, commissioning tests and checking must be successfully completed to get the authorization to energize a new installation.

The following tests and checking are generally mandatory and applicable to the whole installation:

  • Verification that the main substation complies with all the requirements expressed by the utility
  • Measurement of earth-electrodes resistances
  • Electrical continuity of all equipotential and bonding conductors
  • Inspection and functional testing of all MV components
  • Dielectric test of switchgears and transformers
  • Inspection and testing of the LV parts of the installation
  • Mechanical and electrical interlocks checking
  • Protective-relays checking
  • Other additional tests and checking mat be required

Information and requirements provided by the utility 

Based on the information provided by the consumer, the utility must provide his proposition, his commitment and his own requirements concerning the connection of the substation:

  • Level of voltage
  • Supply by overhead line
  • Supply by underground cables
  • Single-line service, ring type supply, parallel feeders, etc.
  • Rated values concerning the voltage
  • Rated value concerning the current
  • Details concerning the applicable tariff and the billing of the electrical energy
  • Comments on drawings and information provided by the consumer
  • Specific requirements applicable to the substation.

The detailed studies of the substation must take into account all these parameters and requirements

Testing & Commissioning Services for:

  • Power Systems
  • Generation Equipment
  • Transformer
  • High Voltage
  • Fiber Optic
  • Transmission Line/ Underground Cable

Our Other Core Services Include:

  • Maintenance Solutions
  • Oil Filtration & Treatment
  • SF6 (Sulfur Hexafluoride)
  • In-house & Onsite Calibration Services