|
|
|
Phone:
800-324-8388
970-249-6129
Fax:
970-249-8919 |
PROTECTIVE RELAYING
Da-Tel offers two lines of protective relaying unit communications. FSK tone
technology is employed in the G-8945 Transfer-Trip System to provide one of the industry's most secure and most
dependable tone based packages.
A natural extension of the G-8945 is the G-9645 Digital Transfer-Trip System, introduced
in 1996. This system adds multiple trip inputs and outputs with the
secure benefits of a digital communications medium. Intended for asynchronous systems, the G-9645 communicates over dedicated
fiber, a fiber bank, or a digital microwave carrier.
Extensive tests are performed on each system in final test and the records are shipped with the system.
These tests simulate the common failures that occur in power generation and distribution systems.
The Tests Are:
Pulsed white noise bursts on the telephone lines.
One side grounded telephone line.
60Hz current injection into the operating telephone line.
Music injection into the operating telephone line.
Single frequency high voltage sweep through the active pass bands of the G-8945 system.
Open, short "file test" action on operating telephone line.
Microwave oscillator, modulator failure sweeping 600 channels through the G-8945 inputs.
G-8945 Tone Transfer-Trip System
|
|
Alarm Relay Outputs
Trip Relay Outputs 30A for 100ms @ 125Vdc
Solid-State Trip outputs 1A @ 125Vdc
Diagnostic module for back-to-back testing
Level and Status Module for monitoring key points and levels
Flash keying operation for higher dependability
Isolated trip inputs
Full SWC on all I/O's
|
|
DataSheet: G-8945.pdf 04-08-02 889KB
The G-8945 Transfer-Trip System uses FSK tones to move the trip signals
between terminals. Improved security against false trips is accomplished through detection of the
tone levels out of limits, a signal-to-noise measurement and timing checks.
The reliability of valid trip detection has also been increased due to an improved discriminator design.
G-9645 Digital Transfer-Trip System
|
|
Alarm Relay Outputs
Trip Relay Outputs 30A for 100ms @ 125Vdc
Solid-State Trip outputs 1A @ 125Vdc
Laptop configuration port using terminal program
Asynchronous operation to 38.4 kBPS
Continuous readout of communications link quality
Isolated trip inputs
Full SWC on all I/O's
Fiber Optic Interface
|
|
The G-9645 Transfer-Trip System employs redundant coding of the trip
inputs to dependably and securely move up to 4 trips in both directions. For systems not
requiring speeds faster than 2 cycles, the G-9625 modem with a leased-line input will serve
well over normal telephone lines.
For increased speed, a dedicated fiber link and a modem that
is attached to the rear of the shelf will provide up to 38.4kBPS operation to reduce the trip time to under 2ms
with no redundancy. Digital microwave systems or fiber banks supporting up to 38.4kBPS operation
in an asynchronous mode are recommended communication links.
Redundancy is the key to this system's dependability, security, and trip-through time.
The redundancy factor may be set to as many as four identical codes, or as few as one code
to validate a trip. With a higher redundancy value comes greater security with the compromise of trip-through time and the
dependability of getting a valid trip.
The G-9645A Transfer Trip Systems have now been field tested for 3 years. Twelve channela have been in full time service in a 69kv substation. A digital transfer trip system using dedicated fiber optic connection offers a solution to false trips due to telephone noise.
G-9645A Digital Fiber Optic Transfer-Trip System
(One trip, each direction, fiber optic)
|
FIBER OPTICS SPECIFICATIONS
Distances to 14 km
Single-mode Fiber
ST Connectors
Repeaters Available
G-9645A (One trip, each direction, fiber optic)
Webmaster Copyright © 1998-2003 Da-Tel Research Company Inc.
E-mail