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 +55° 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:
High voltage module
Low voltage module
High voltage module
- 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).
Low voltage module
- 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 name | Parameter value |
| Rated voltage, kV | |
| — high | 35 |
| — medium | 20, 10, 6 |
| — low | 0.4 |
| Supply transformer capacity, MVA | Up to 35 |
| Frequency of alternative electric current, Hz | |
| Rated current of bus bars, А | 630, 800, 1000, 1250, 1600, 2000, 2500, 3150 |
| Rated voltage of auxiliary circuits, V | |
| DC | 220 |
| AC | 220, 380 |
| Switchgear 110 kV parameters: | |
| – rated thermal current(1 s), кА | Up to 50 |
| – electrodynamic withstand nominal current, кА | Up to 128 |
| – cutoff current of the fault interrupter switch, кА | Up to 50 |