Mobile Substations

Mobile SubstationsMobile Substations

Mobile Substations

2

Ideas that work for the continuity of Service

Increase the continuity of service during emergencies by replacing a complete substation in case of failure condition Ensure service during maintenance Temporary over-capacity for - new neighborhoods - new industrial plants - remote locations - rural electrification projects For permanent and semi-permanent installations Integrate communications within electrical services

Reduced maintenance costs Continuity of service by reducing downtimes Electrical flexibility for maximum utilization and return on investment Maximum mobility Rapidly placed in service Quickly available for service Maximum reliability through of ordinated design Minimum clearance height for greater utilization Maximum KVA with minimum weight

IEM Mobile Substation 45 MVA, FOA,HV: 230 kV, LV:23 kV, 60 Hz Wye-Wye

IEM Mobile Substation 45 MVA, FOA,HV: 230 kV, LV:23 kV, 60 Hz Wye-Wye

A mobile substation is a complete electrical substation mounted on one or more trailers.

IEM mobile substations are turn-key solutions designed and manufactured to comply with customer speci-fications in order to provide a top class product.

Benefits of IEM Mobile Substations:

3

Applications of IEM Mobile Substations:

IEM transformers are designed, manufactured and tested in compliance with ANSI/IEEE, NEMA, IEC standards and customer specifications.Since 1995, IEM has been ISO-9001 certified in recognition of the quality systems implemented for the production of its multiple products.

IEM was established in 1948 by Westinghouse Electric Corporation and Mexican investors. Today, it is one of the most diversified electrical industries in Mexico, and its a part of GRUPO CONDUMEX, one of the largest Mexican industrial groups.

Our mission is to manufacture electrical equipment in cost-effective manner, in order to deliver price-competitive products with the quality and service that satisfy our customers requirements.

Mobile SubstationsMobile Substations

Mobile Substations

2

Ideas that work for the continuity of Service

Increase the continuity of service during emergencies by replacing a complete substation in case of failure condition Ensure service during maintenance Temporary over-capacity for - new neighborhoods - new industrial plants - remote locations - rural electrification projects For permanent and semi-permanent installations Integrate communications within electrical services

Reduced maintenance costs Continuity of service by reducing downtimes Electrical flexibility for maximum utilization and return on investment Maximum mobility Rapidly placed in service Quickly available for service Maximum reliability through of ordinated design Minimum clearance height for greater utilization Maximum KVA with minimum weight

IEM Mobile Substation 45 MVA, FOA,HV: 230 kV, LV:23 kV, 60 Hz Wye-Wye

IEM Mobile Substation 45 MVA, FOA,HV: 230 kV, LV:23 kV, 60 Hz Wye-Wye

A mobile substation is a complete electrical substation mounted on one or more trailers.

IEM mobile substations are turn-key solutions designed and manufactured to comply with customer speci-fications in order to provide a top class product.

Benefits of IEM Mobile Substations:

3

Applications of IEM Mobile Substations:

IEM transformers are designed, manufactured and tested in compliance with ANSI/IEEE, NEMA, IEC standards and customer specifications.Since 1995, IEM has been ISO-9001:2000 certified in recognition of the quality systems implemented for the production of its multiple products.

IEM was established in 1948 by Westinghouse Electric Corporation and Mexican investors. Today, it is one of the most diversified electrical industries in Mexico, and its a part of GRUPO CONDUMEX, one of the largest Mexican industrial groups.

Our mission is to manufacture electrical equipment in cost-effective manner, in order to deliver price-competitive products with the quality and service that satisfy our customers requirements.

Mobile Substations

Components

4

Lightning ArresterProtection level in coordination with transformer insulating level. In case windings have two or more voltage levels, multiple lightning arresters are used (one for each voltage level), which are interchanged at the same time the winding voltage level is changed.

Disconnecting SwitchSingle or three pole with capacity to interrupt transformer magnetizing currents. Can be operated locally or from a remote location.

HV BreakerDead tank SF6 circuit breakers are commonly used, with motor-wound spring operating mechanism, operable on even loss of auxiliary power.

S&C Circuit SwitcherCircuit switchers feature SF6 gas filled interrupters and single-pressure puffer technology for restrike-free, non-current chopping performance. Used when limited capacity due to space or alarm conditions are presented.

Power FusesNormally mounted between the lightning arrester and the transformer. Selected in accordance with voltage and current ratings.

Potential transformer and current transformerUsed to reduce voltage to 120 V and current to 5A for metering and protective relays. They also provide insulation between the primary and secondary circuits. For 25 kV and above PTs and CTs are suitable for outdoor use and below this range for indoors or outdoors in accordance with customer specifications.

High Voltage Section

Transformer Section

Mobile Substations 6

Trailer Chassis

All electrical equipment is distributed on a trailer base designed for this special application. The equipment is located so its weight is distributed for maximum mobility and at the same time, keeping electrical distances with enough safety margins for a reliable operation.

Trailer chassis normally include: dual wheels with multiply pneumatic tires, air brakes with emergency breakaway on all wheels, fittings for connecting the brake system to the tractor, choke blocks for holding the trailer stationary when disconnected from the tires, four heavy-duty screw jacks for leveling and removing the load from tires, towing eyes and storage compartments.

The trailer chassis is designed to meet with state and federal road regulations.

The mobile substation will travel at 60 mph on first class paved highway.

Since security is an important item on mobile substations, the trailer may be checked with off road testing for dynamic stress measurement using strain gauges.

Auxiliary transformer for control powerOil immersed, single or three phase and permanently connected to the low voltage of the main transformer.

LV BreakerA vacuum or SF6 breaker normally provides low voltage protection against short circuit currents. The breaker and its controls are mounted on the trailers low voltage end or in a different trailer depending on customer specifications.Three phase, metal enclosed, metal clad single busbar switchgears may be used for indoor installation. This kind of switchgear has a hermetically sealed primary enclosure, which provides protection against accidental contact and is independent of environmental effects

Protective RelaysFor protection against abnormal transformer differentials and sudden gas pressures. A wide variety of relays can be installed to meet specification needs

Lightning ArrestersFor each voltage rating coordinated with transformer insulation level to allow ample margin between protective level and insulation strength.

a) Potential transformer, b) Disconnecting switch with ground switch blade

c) Dead tank SF6 circuit breaker with rotating table and, d) lightning arrester.

Nelson trailer chassis and jeep dolly specially designed for mobile substations

a b c d

High Voltage Section

1. Lightning Arrester 2. Disconnect Blades 3. HV Breaker

Transformer Section

4. HV Bushings 5. Core type Transformer 6. Forced oil and air cooling (FOA) 7. DTC 8. LV Bushings

Low Voltage Section

9. Fused Disconnect Switches Cabinet 10. Auxiliary transformer 11. LV Breaker 12. Lightning Arrester 13. Power Fuses

14. Substation Metering, Control and Protection cabinet 15. Trailer chassis 16. Cable Rheels

1 2

4

8

6

9

11

12

13

16

15

57

3

Low Voltage Section

Lightning Arresters and Low Voltage Breaker on the low voltage

section of a 10 MVA, FOA Mobile Substation

BushingsBushings can be supplied as standard ceramic or with silicon insulation. Bushings are selected in accordance to voltage and current requirements.

TransformerCore or Shell type, with same thermal, mechanical, dielectric and economic advantages of IEM power transformers. - Compact design to optimize the transformer volume and reduce its total weight. - Designed to handle average winding temperature rise of 65, 75 or 95 C. - NOMEX/ pressboard or NOMEX insulation

Forced oil and air cooling (FOA)Forced oil cooling consists of a seamless tubular cooler heat exchanger plus a submerged pump and motor .A bearing wear monitor is proposed which stops the pump in the event bearing wear has reached and unsafe level.

Tap ChangersThe transformer could have one or more de-energized tap changers (DTC) on high or low voltage winding, delta-wye switches or on load tap changer (LTC) on high or low voltage winding. On all cases, external operating mechanism allows the voltage connections to be changed without opening the tank. LTC may be Resistive or inductive type and DTC may be Series-Parallel type.

High temper