Ormazabal Velatia mb.m series Instruction manual

LIB

mb.m

Outdoor metal prefabricated transformer

substation

General Instructions

IG-245-EN, version 05, 13/02/2020

In view of the constant evolution in standards and design, the characteristics of the elements contained in this manual are subject

to change without prior notice. These characteristics, as well as the availability of components, are subject to confirmation by

Ormazabal.

CAUTION!

When medium-voltage equipment is operating, certain components are live, other parts may be in movement and some may

reach high temperatures. Therefore, the use of this equipment poses electrical, mechanical and thermal risks.

In order to ensure an acceptable level of protection for people and property, and in compliance with applicable environmental

recommendations, Ormazabal designs and manufactures its products according to the principle of integrated safety, based on

the following criteria:

• Elimination of hazards wherever possible.

• Where elimination of hazards is neither technically nor economically feasible, appropriate protection functions are

incorporated in the equipment.

• Communication about remaining risks to facilitate the design of operating procedures which prevent such risks,

training for the personnel in charge of the equipment, and the use of suitable personal protective equipment.

• Use of recyclable materials and establishment of procedures for the disposal of equipment and components so

that once the end of their service lives is reached, they are duly processed in accordance, as far as possible, with the

environmental restrictions established by the competent authorities.

Consequently, the equipment to which the present manual refers complies with the requirements of section 11.2 of Standard

IEC 62271-1. It must therefore only be operated by appropriately qualified and supervised personnel, in accordance with the

requirements of standard EN 50110-1 on the safety of electrical installations and standard EN 50110-2 on activities in or near

electrical installations. Personnel must be fully familiar with the instructions and warnings contained in this manual and in other

recommendations of a more general nature which are applicable to the situation according to current legislation[1].

The above must be carefully observed, as the correct and safe operation of this equipment depends not only on its design but also

on general circumstances which are in general beyond the control and responsibility of the manufacturer. More specifically:

• The equipment must be handled and transported appropriately from the factory to the place of installation.

• All intermediate storage should occur in conditions which do not alter or damage the characteristics of the equipment

or its essential components.

• Service conditions must be compatible with the equipment rating.

• The equipment must be operated strictly in accordance with the instructions given in the manual, and the applicable

operating and safety principles must be clearly understood.

• Maintenance should be performed properly, taking into account the actual service and environmental conditions in

the place of installation.

The manufacturer declines all liability for any significant indirect damages resulting from violation of the guarantee, under any

jurisdiction, including loss of income, stoppages and costs resulting from repair or replacement of parts.

Warranty

The manufacturer guarantees this product against any defect in materials and operation during the contractual period. In the

event that defects are detected, the manufacturer may opt either to repair or replace the equipment. Improper handling of this

equipment and its repair by the user shall constitute a violation of the guarantee.

Registered Trademarks and Copyrights

All registered trademarks cited in this document are the property of their respective owners. The intellectual property of this manual

belongs to Ormazabal.

[1] For example, in Spain the “Regulation on technical conditions and guarantees for safety in high-voltage electrical installations” – Royal Decree

337/2014 is obligatory.

IG-245-EN version 05; 13/02/2020 3

General Instructions

mb.m

Contents

1. Description and main characteristics.......................4

1.1. Elements of the mb.m .......................4

1.1.1. Medium voltage switchgear..................6

1.1.2. Power transformer ...........................7

1.1.3. Low voltage switchgear . . . . . . . . . . . . . . . . . . . . . .7

1.1.4. Metal frame..................................7

1.2. Name plate ..................................8

1.3. Mechanical ratings...........................8

1.3.1. Dimensions and weight of mb.m for

transformer power below 2500 kVA...........8

1.3.2. Dimensions and weight of mb.m for

transformer power equal to or above

2500 kVA ....................................9

1.3.3. Dimensions and weight of mb.m with low

voltage outputs.............................10

2. Transport ..................................................................17

2.1. Location of accessories during transport .....17

2.2. Road haulage ...............................17

2.2.1. Transport agents............................17

2.2.2. Selecting the route for road transport .......18

2.2.3. Checking impact detectors..................18

2.2.4. Responsibility...............................18

2.2.5. Packing.....................................18

2.3. Sea transport ...............................19

3. Storage......................................................................20

4. Normal service conditions.......................................21

5. Installation ...............................................................22

5.1. Location ....................................22

5.2. Planning....................................23

5.3. Preparing the ground .......................24

5.4. Handling ...................................28

5.4.1. Handling the mb.m .........................28

5.4.2. Removing from an HC-type sea container....29

5.5. Cable access and sealing ....................32

5.6. Door adjustment............................34

5.7. Earthing circuit connection..................35

5.7.1. Recommended exterior protective earth

network ....................................35

5.8. Replacing the electrical equipment ..........36

5.8.1. Replacing the medium voltage switchgear...36

5.8.2. Replacing the transformer unit ..............37

5.8.3. Access to the transformer site ...............37

5.8.4. Transformer secondary connection ..........39

6. Recommended sequence of operations.................40

7. Maintenance.............................................................40

8. Annex: recommended tightening torques ............41

IG-245-EN version 05; 13/02/2020

Description and main characteristics General Instructions

mb.m

1. Description and main characteristics

Ormazabal's mb.m transformer substation is a frame-

mounted prefabricated metal transformer substation,

installed at ground level with outdoor operation, reduced

visual impact, standard-built, tested and supplied from the

factory as a single unit.

The mb.m transformer substation is designed following the

requirements set out in Standard IEC 62271-202.

mb.m is designed for installations in electrical networks

with rated voltage up to 40.5 kV in alternating current. Its

reduced weight and dimensions enable easy handling and

transport.

Optionally the mb.m can be supplied tested to internal

arc IAC-AB 20 kA 1 s, in accordance with Standard

IEC62271-202.

1.1. Elements of the mb.m

Ormazabal's mb.m transformer substation is characterised

by the fact that it includes outdoor medium voltage

switchgear and a metal frame-mounted outdoor-type

transformer unit.

The low voltage outputs model also includes low voltage

switchgear.

The main elements of the mb.m are:

• Medium voltage switchgear.

• Transformer unit.

• Metal frame assembly.

• Low voltage switchgear (in the low voltage outputs

model only).

IG-245-EN version 05; 13/02/2020 5

General Instructions

mb.m

Description and main characteristics

Other available options are:

• IP1X perimeter protection for the transformer unit.

• Oil collection tank with incorporated valve and lter.

• Low voltage cable bracket.

• Medium voltage cable bracket (clamp with maximum

diameter 95 mm and minimum diameter 48 mm).

• Medium voltage and/or low voltage terminal cover box.

• Closing system for the bottom cable input in the base of

the medium voltage cubicles.

• Lighting inside the medium voltage switchgear

enclosure.

• Outdoor low voltage feeder protection box.

• Terminal box for centralisation of sensor signals and

medium voltage switchgear.

1Medium voltage switchgear

2Transformer unit

3Metal frame assembly

Figure 1.1. Main elements of the mb.m

1Medium voltage switchgear

2Transformer unit

3Metal frame assembly

4Low voltage switchgear

Figure 1.2. Main elements of mb.m with LV outputs

IG-245-EN version 05; 13/02/2020

Description and main characteristics General Instructions

mb.m

1.1.1. Medium voltage switchgear

The medium voltage switchgear, in compliance with

Standard IEC 62271-200, includes a rust-protected

independent metal outer enclosure with front access.

The medium voltage electrical equipment that can be

incorporated is as follows:

• cgmcosmos (IEC), 24kV - 400/630A system, technical