Patent for Sale:

DC Bus Duct with Heat Dissipating Enclosure    

A high current DC bus duct system with clear enclosure, enhanced heat management, and moveable drop points.


The technology is directed to the field of electrical bus systems, particularly those of the type that carry large currents and thereby produce much excess heat. Electrical bus systems are commonly employed in telecommunications systems such as telephone and fiber optic systems where low voltages and high currents are required, preferably about 48 volts and 5,000 – 10,000 amperes.

These applications use large direct currents, it is better to use an assembly of copper bus bars rather than stranded wire. In a typical bus work assembly, a number of bus bars are provided, each being copper plates, typically having widths of about eight inches. The bus bars are typically provided in laminations of as many as fourteen for each electrical polarity,and the laminations of each polarity are separated in order to insure safety.

In a typical telecommunications system, alternating current (AC) is received from a supply, e.g., a utility, and passed through a rectifier to convert the current to direct current (DC). The direct current is conducted along the bus bar laminations, which “float” one or more battery strings which are then used to provide the load to the telecommunications system. The battery strings are typically an array of conventional lead-acid or nickel-cadmium batteries, and provide an electrical load at a consistent voltage and current.

For safety purposes, one common practice, is to enclose the bus bar laminations in a duct work. In this way, the bus bars are protected from external damage, e.g., from water leakage, and accidental short circuits that could result in injury to personnel and damage to equipment. Typically, the two bus bar polarities are retained within a safe proximity, so as to be enclosed within the same duct work assembly. The duct work relies on an airspace to provide a degree of electrical isolation. Such duct work has traditionally been fabricated of either galvanized steel or aluminum.

During non-peak usage periods, a bus assembly may only operate at 10% of a maximum load capacity, a current of about 1000 amperes. However, during peak usage times, current loads can approach 100% capacity, about 10,000 amps. This creates a considerable amount of heat in the bus assembly, which reduces conductivity and can result in an undesirable reduction in available service and even damage to the system. This heat problem can be complicated by the duct work enclosure, since the metal ducts absorb the heat from the bus bars and thus retain a considerable amount of heat within the enclosure.

The difficulties and drawbacks of previous systems are overcome by the electrical bus system of this patented technology in which first and second bus bar assemblies are provided for conducting electrical currents of respective first and second polarities. A bus duct enclosure is provided for enclosing the bus bar assemblies. The bus duct enclosure is adapted to provide a heat dissipative configuration. In one aspect of the invention, the bus duct enclosure can be formed of a substantially polycarbonate material, for providing convective heat dissipation from the bus bar assemblies.

The patented technology is capable of other and different embodiments and its several details are capable of modifications in various respects, all without departing from the invention.

Primary Application of the Technology

Ideal for DC power systems in Telecommunications applications.

Comments on Deal Structure, Potential Terms and Restrictions

This is an outright sale, subject to terms under Ch. 11 proceedings (purchase must have court approval).

Patent Summary

U.S. Patent Classes & Classifications Covered in this listing:

Class 174: Electricity: Conductors And Insulators

This class is for inventions relating to the structure of electrical conductors and insulators and insulators and the apparatus specialized to mounting, supporting, encasing in conduits, and/or housing the same. Conductors may be bare or be encased in insulation, may be single strand or plural strand, may be of single conductor form or there may be a plurality of conductors associated together to form a cable. Since all materials that have the property of being conductors of electricity and all devices made therefrom may be termed electrical conductors, only those structures that are specially designed to conduct electricity as their proximate purpose are placed in this class. Insulators are placed here when the structure thereof is claimed, which structure is specially designed for spacing two or more devices of different electrical potential from each other or for spacing one or more devices from ground. Since all materials which are poor conductors of electricity and devices made therefrom may be termed electrical insulators, only those structures whose proximate purpose is that already stated. Conduits are placed in this class only when some characteristic is claimed which limits the same to the electrical use.

Subclass 72B: Bus bars
Subclass 99B: Bus bars

Class 361: Electricity: Electrical Systems And Devices

Systems or devices which provide safety and protection for other systems and devices; control circuits for electromagnetic devices and non-electromagnetic-type relays. Systems or devices which discharge, or prevent the accumulation of electrical charge on or in an object or material; circuits for charging objects or materials. Systems for generating or conducting an electric charge. Systems which process electrical speed signals. Circuits for reversing the polarity of an electric circuit. Systems which cause the ignition of a fuel or an explosive charge. Systems and processes for demagnetizing a magnetic field. Transformers and inductors with integral switch, capacitor or lock. Electrostatic capacitors, per se. Housings and mounting assemblies with plural diverse electrical components. Electrolytic systems and devices.

Subclass 624: Having busbar arrangement
Subclass 637: Busbar or conductor arrangements
Subclass 650: Spaced parallel relationship