ISOBUS MR

ISOBUS MR Details

INTENDED USE

The solid insulated busbar type ISOBUS MR is ideal for medium & low voltage safety critical projects. ISOBUS MR is both electrically and geometrically made to measure according to project specifications. Up to 36 kV & 6 500 A per single phase is possible. For shorter generator connections, where space is very limited, it is possible to provide up to 36 kV & 12 000 A. Here we use 2 X busbars per phase.

Low voltage systems:
AC DC
Nominal voltage Up to 1,2 kV Up to 2 kV
Nominal current Up to 12 000 А Up to 14 000 А

 

Medium voltage systems:
AC DC
Nominal voltage Up to 36 kV Up to 60 kV
Nominal current Up to 12 000 А Up to 14 000 А

FEATURES of ISOBUS MR

  • Touch safe
  • Small overall dimensions, up to 40% less space needed than cable systems
  • Tight bending radius, up to 80% tighter bend radius than cable systems
  • Designed and built using a modular installation approach
  • Suitable for outdoor & indoor applications
  • Ambient temperature from -50° to +55 °C
  • Very high degree of protection up to IP68
  • Suitable for marine & wet environments
  • High resistance to ultraviolet, chemicals and aggressive environments
  • Maintenance free
  • High degree of fire rating
  • No phase to phase short circuit possible
  • Partial discharge free according to IEC 60137
  • Modular distribution kit, simply bolted together with no special tools required
  • Natural (air) cooling
  • Very low power losses (I²R)
  • Lowest lifecycle costs for end clients

The busbar element’s construction

The busbar consists of elements of a various configurations; straight sections or with multiple angles, up to 10 meters in length. Connections sleeves connect the various elements together; this gives the system a modular approach. Flexible connections for generators, transformers and various switchgear are available; all in accordance with the requirement specifications for the busbar installation.

The basic conductor tube (1) can be aluminum or copper & either solid or hollow, depending upon amperage. Then the conductor tube is rapped with crepe paper and layers of semi conducting paper (2) in order to provide the capacitive grading layers. During manufacture under vacuum, epoxy is pulled through to ensure a void free partial discharge free composite dielectric (3). The embedded earth layer ensures that the system is touch safe whilst operational (4). To make connections easy between busbar — busbar and busbar — other equipment, there is a DIN flat terminal (5) at the ends of each element.
For low voltage solid insulated busbar type ISOBUS MR solutions up to 1.2 kV there are no capacitive grading layers & no earth layer required.

Examples of elements
Almost any geometric shape is possible, below are some examples.

Straight element

L-element

Z-element

Z-element

CONNECTION METHODS OF ELEMENTS
Separate elements of the busbar are connected to each other by flexible connectors, which allow for compensation of linear dilatation of the conductor due changing temperatures. The connection is enclosed in a connection sleeve (Figure 2) which has the cast insulation and pressure-tight flanges from both sides. For balancing the potentials between the current carrying conductor and the internal surface of the coupling a metal ring and a contact spring are provided.

SOLID INSULATED BUSBAR ISOBUS MR FIXATION SYSTEM
We use a special computer program to dimension the fixation system, taking into account short circuit current, natural frequency & weight. The distance between the mounting places of the busbar to the walls, ceiling or floor is calculated, prohibited distances are also calculated. Fixation of the busbar to the walls, ceiling or floors is carried out by means of polyamide clamps, aluminum x-profiles, fixing angles and hardware. Mounting to a wall allows both horizontal and vertical installation of the busbar. We can also mount to the floor when required.

ISOBUS MR FIREPROOF WALL PENETRATIONS
ISOBUS MR is compatible with any fireproof wall penetration which our clients require for their projects.

GROUNDING OF THE BUS BAR
The busbar equipment is individually grounded as follows, the bus bars, the connecting sleeves and the fixing system.

CONNECTION TO EQUIPMENT
According to individual project specifications and requirements, we select the optimal busbar path to ensure the safest and shortest route. Connections to other equipment can be from the top, the side, or underneath. Generator & transformer connections are done using high flexible copper connections. Protection boxes or special flanges can be supplied where necessary.

UL and IEEE Certifications are in process.

Type Tests
The ISOBUS busbar system is a type tested system. The following tests are performed:

  • Dry power-frequency voltage withstand test
  • Dry lightning impulse voltage withstand test
  • Temperature rise test
  • Verification of thermal short-time current withstand
  • Verification of dimensions

Additional Tests
In addition to the electrical type tests the following additional tests are performed:

  • Vibration and Shock tests respectively Seismic tests
  • Tests for mechanical stability
  • Fire tests
  • Climate tests to ensure the performance during operation, transportation and storage
  • Ingress Protection (IP) tests

Routine Tests
After manufacturing process, each element of a busbar system meaning the busbar elements and connection are routine tested following the IEC 60137. The following tests are performed:

  • Dimensional check of the conductors
  • Dry power-frequency voltage withstand test
  • Measurement of partial discharge quantity
  • Measurement of dielectric dissipation factor (tan δ) and capacitance at ambient temperature
  • Final visual inspection

THE STANDARD SET OF EQUIPMENT
Material
The busbar system is delivered to the site as complete solution ready for installation.
The delivery includes:

  • Busbar elements
  • Connection tubes
  • Flexible connectors
  • Flanges
  • Fixation system including double C-profile, screw material, angles material
  • Grounding material for connecting all busbar elements / parts
  • Installation manual
  • Installation drawings

If applicable additional material is supplied as well, like:

  • Connection box
  • High flexible connectors
  • Special flanges
  • Steel construction

DOCUMENTS
The content of the documentation is as follows:

  • Routine test report for each busbar element and connection tube
  • Operation and Installation manual
  • Assembly drawings of the busbar system
  • Packing list
  • Warranty information

ADDITIONAL EQUIPMENT AND ACCESSORIES
On request Tefelen can offer and deliver the following additional electrical equipment which will be integrated in the total busbar system solution:

  • Current transformers
  • Voltage transformers
  • Tap off boxes for example cable connections