ISOBUS MR

ISOBUS MR

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.

INTENDED USE

Solid resin insulated Busbar and bus pipe of type ISOBUS MR is ideal for low and medium voltage, safety critical projects. ISOBUS MR is both electrically and geometrically made to measure according to project specifications. Up to 36 kV and 6 500 A per single phase is possible. For shorter connections, where space is very limited, it is possible to provide up to 36 kV and 12,000 A by using two conductors per phase.

Low Voltage Systems:

  AC DC
Nominal voltage Up to 1.2 kV Up to 2 kV
Nominal Current Up to 12,000 A Up to 14,000 A

Medium Voltage Systems:

  AC DC
Nominal voltage Up to 36 kV Up to 60 kV
Nominal Current Up to 12,000 A Up to 14,000 A

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
  • Operating ambient temperature from -60° to +55°С/-75° to +131°F
  • Very high degree of ingress 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 basic conductor (1) can be aluminum or copper and either solid or hollow, depending upon amperage. The conductor is wrapped
by alternating insulated crepe paper layers and layers of semi-conducting paper (2) in order to provide the capacitive grading needed.
A vacuum system pulls epoxy resin through the entire length of the element to ensure a void free, partial discharge-free composite dielectric
(3) insulation. The Grounding layer ensures safety while operational (4). To make connections easy between Bus Pipe, and other terminating
equipment, there are end connectors (5) at the ends of each element. Custom end connectors are possible.

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 Bus Pipe elements are connected to each other by use of bus expansion compensators, which are flexible copper laminate connections. These allow for thermal expansion and contraction. They also allow build tolerances of up to ±2 inches per connection. The connection is then enclosed by a fully insulated connecting sleeve which has pressure-tight flanges on both sides. In order to balance the potential between the current carrying conductor and the internal surface of the connecting sleeve, a metal ring with contact spring is provided.

Bus Pipes have capacitive control therefore there is a red grading length on both ends. Separate Bus Pipe elements are connected to each other by use of bus expansion compensators, which are flexible copper laminate connections. These allow for thermal expansion and contraction. They also allow build tolerances of up to ±2 inches per connection.

The connection is then enclosed by a fully insulated connecting sleeve which has pressure-tight flanges on both sides. In order to balance the potential between the current carrying conductor and the internal surface of the connecting sleeve, a metal ring with contact spring is provided.

SOLID INSULATED BUSBAR ISOBUS MR FIXATION SYSTEM

We use a proprietary computer program to dimension the fixation system, taking into account short circuit current, natural frequency and weight. The distance between the mounting points of the Busbar to the walls, ceiling or floor is calculated by our software. 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 all Fireproof wall penetration requirements.

GROUNDING OF THE BUS BAR

The busbar equipment is individually grounded as follows: the bus bars, the connection 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.

Certificates issued for ISOBUS MR meet the requirements of ISO9001:2015.

ISOBUS MR and TKL quality is ensured by means of close final inspection of electrical equipment. All conductor materials (copper and aluminum pipes, rods and stripes), insulation materials, nylon clamps and components from sub suppliers are rigorously checked.

We also monitor each step of the electrical pathway during our production.

Each element of the Busbar/Bus Pipe is then high voltage tested in our in-house test cage.

Type Tests

The ISOBUS MR 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 DELIVERED EQUIPMENT

Material
The busbar system is delivered to the site as complete solution ready for installation.
The delivery includes:

  • Bus Pipe elements
  • Connecting sleeves
  • Flexible or high flexible bug expansion compensators for connection of elements to each other and connections of the Bus Pipe to equipment
  • Nuts and Bolts
  • Fixation system including aluminum x-profiles and hardware
  • Grounding cable
  • 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 Bus Pipe element and connecting sleeve
  • Operation and Installation manual
  • Assembly drawings of the Bus Pipe 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