MMS 35/10(6) kV

Mobile modular substations of 35 kV are a transformer substation, consisting of one or more modules, the composition of which includes separate mobile platforms, ensuring its mobility.

MMS are used to handle the following tasks:

  • use as a main step-down or step-up distribution substation, including for electrical power consumers located in places where the construction of stationary substations is not cost-effective;
  • back-up of the primary equipment of the stationary substation in case of emergency power cutoffs;
  • intermittent connection to the power grid of objects under construction in case of absence of electric power supply during the construction period;
  • intermittent connection of consumers to the electrical power grid for the period of reconstruction of the existing stationary substation;
  • load shedding of electrical power grids during peak busy hours.

         MMS distinguishing features

  • MMS is a product of maximum operational readiness.
  • Ability to install various types and composition of equipment in accordance with the Customer’s requirements.
  • Possibility of increasing connections on a modular basis.
  • Convenience of assembling and operation.
  • Mobility and ease of car transportation by due to placing equipment on travelling platforms.
  • Reducing the duration of commissioning works by reducing the scope of work required to install equipment at the facility.
  • Reducing the size of the land parcel and the construction works scope on the site arrangement for the substation installation by reducing the substation dimensions in a mobile modular version.
  • Ability of connection to cable as well as to overhead power lines.

MMS operation conditions

  • MMS climatic version and placement category — Y1, XL1 by GOST 15150-69;
  • ambient air temperature from -60° C to +40° C;
  • type II atmosphere – industrial, environment – non-explosive, free of dust in concentrations that reduce the product parameter
  • air relative humidity up to 80% at the temperature of 20ºС;
  • installation altitude above sea level is no more than 1000 m;
  • wind speed up to 36 m/s (wind pressure up to 80 daN) in the absence of atmospheric ice, wind speed up to 15 m/s (wind pressure up to 14 daN) with the atmospheric ice with its thickness of 20 mm;
  • seismic resistance is 8 points per MSK- 64.

MMS of 35 kV composition includes:

  • feeder disconnector block with ground terminals;
  • 35 kV current transformer;
  • 35 kV voltage transformer;
  • 35 kV fault interrupter switch;
  • mobile version of power oil transformer 35 kV;
  • 35 kV excess-voltage suppressor;
  • specialized travelling platform (semitrailer).
  • 10 (6) kV switchgear;
  • auxiliary power transformer;
  • the operational power system with a compact storage battery and a recharging device;
  • central alarms cabinet;
  • relay protection and automatic equipment cabinet;
  • alternative current in-house cabinet;
  • telemetry equipment cabinet;
  • metering cabinet;
  • container storage unit;
  • jumper cables;
  • specialized travelling platform (semitrailer).

Depending on the MMS capacity and the number of 10 (6) kV outgoing lines, it is possible to place the equipment on a single specialized semitrailer.

Parameter nameЗначение параметра
Rated voltage, kV 
— high35
— medium20, 10, 6
— low0.4
Supply transformer capacity, MVAUp to 40
Frequency of alternative electric current, Hz 
Rated current of bus bars, А630, 800, 1000, 1250, 1600, 2000, 2500, 3150
Rated voltage of auxiliary circuits, V 
DC220
AC220, 380
Switchgear 110 kV parameters: 
– rated thermal current(1 s), кАUp to 50
– electrodynamic withstand nominal current, кАUp to 128
– cutoff current of the fault interrupter switch, кАUp to 50