ProTec Company Information

	Eliminates corrosion, pipe blockages and water leaks, copper tracking, erosion and isolation valve failures to save on maintenance costs.
	Allows for the option of keeping existing switches to eliminate unnecessary replacement.*
	Maintains the Kirk Key Interlock by maintaining the original switches.*
	Increases the current carrying capacity from 1600 Amps to 2000 Amps.
	Includes heat sink fans for emergency cooling.
	Replaces individual fuses with three AC line fuses for better coordination.
	Designed for drop-in replacement for ease of installation.
	Includes field-serviceable diode bridge assemblies.
	Replaces 24 diode design with 6 diode design.
	Includes heat sink RTDs wired to RTD relays for monitoring or alarm.
	Includes thermostat-controlled back-up fans for added protection.
	Includes individual fuse status indicating lights.
	Provides the option of changing heat sink RTD relays to RTD transmitters for monitoring heat sink temperatures.

* With the ProTec Air Bridge 2000™ many switch options are available. ProTec, Inc. does offer new switches to replace the existing switches. ProTec, Inc. can also exchange existing switches for ones that have been refurbished in advance or can refurbish existing switches. Finally, should the existing switch not need replacing or refurbishment the ProTec Air Bridge 2000™ is designed specifically to be a bolt-in replacement for the original water-cooled bridges.

In the 1960’s and 1970’s water-cooled rectifiers were designed to provide the excitation requirements to the generator field. Large rectifier diodes had yet to be developed so multiple diodes and water-cooling were required to provide the high DC current rating. This substantially complicated the design and decreased reliability which has resulted in of world-class power electronic equipment pervasive problems including corrosion, pipe blockages, isolation valve failures, erosion, copper tracking and leaks.

The ProTec Air Bridge 2000™ is a convection air-cooled bolt-in replacement for the aged and problematic water-cooled diode bridges that were originally supplied with the Alterrex Excitation Systems. Named for its current carrying capacity, the ProTec Air Bridge 2000™ offers enhanced functionality, ease of use and minimal installation cost. The ProTec Air Bridge 2000™ is the economic answer to problematic water-cooled systems.

The ProTec Air Bridge 2000™ is a convection air-cooled replacement for the original water-cooled diode rectifiers. In order to minimize retrofit costs, it has been designed specifically to be a bolt-in replacement for the original water-cooled bridges. The ProTec Air Bridge 2000™ eliminates the need for cooling water thereby eliminating the expense of the maintenance and repair of leaks, copper tracking, corrosion, isolation valve failures, pipe blockages and erosion that have been common problems among the water-cooled systems.

The ProTec Air Bridge 2000™ not only eliminates the problems associated with water-cooled rectifiers, but it provides the benefit of increasing the current carrying capacity from 1600 Amps (the amp rating of the original bridge) to 2000 Amps. The original twenty-four diode system is replaced with a six-diode convection air-cooled system. Heat sink fans are included and controlled by heat sink thermostats if for any reason emergency cooling is needed. Each of the six diodes is mounted between two high efficiency heat sinks designed specifically for this application. The heat sink clamp is pre-calibrated and has a force indicator. Thermostats for controlling the heat sink fans and Resistive Temperature Detectors are wired to terminals for remote monitoring.

The ProTec Air Bridge 2000™ includes AC line fuses that have been selected to provide steady-state, short circuit and I2T protection of the diodes. The I2T protection will allow the fuse to clear before damage to the diode occurs. Blown fuse indicators are wired to a terminal strip for remote monitoring.

The ProTec Air Bridge 2000™ also includes two 2000 amp, 50 mV shunts - one in the positive and one in the negative output leg. The 50 mV shunt outputs are wired to terminals for remote monitoring.

Bridge Details	Original Diode Bridge	ProTec Air Bridge 2000™
Cooling Medium	Water	Ambient Air
Bridge Rating	1600 Amps	2000 Amps
Number of Diodes	24	6
Diode Current Rating	800 Amps	5000 Amps
Diode PIV	800 PIV	2400 PIV
Fuses	Individually Fused	3 AC Fuses with Indication
Ambient Temperature Rating	50º C	50º C
Fuse Indication	Fuse Indicating Lights	Fuse Status Lights
Diode Temperature Monitor	None	Heat Sink RTD's*
Diode Temperature Alarm	None	Heat Sink Temp Switches*
Snubbers	Individual Snubbers	6 DC snubbers
Emergency Cooling	None	Heat Sink Fans

*Standard equipment is one RTD and one temperature switch per heat sink.Additional temperature switches and/or RTD’s available. Relays for alarm or backup fans also available at the time of order.

Call ProTec Today for more information on this new retrofit solution.

ProTec Inc.
1930 Village Center Circle, Suite 3-149,
Las Vegas, NV 89134.

Contact: Kevin Nichols

Phone: 702.233.2220
Fax: 702.233.2221

E-mail ProTec

ProTec offers an efficient and cost effective alternative to printed circuit board replacement.

ProTec only uses equipment-e xperienced instructors with first-rate instructional skills.

We are committed to providing the highest quality field services, at a reasonable cost.