POWER October 2013 - 22

rity scheme. The system provided to Termoyopal
was designed with multiple levels
of security clearances so that each user
account could be customized for secure
access to the system.
TTS's TMS-1000 control system uses
Rockwell's RSLogix5000 programming
software. RSLogix5000 follows the industrial
programming standard IEC 61131-3
and features the following programming
languages: Ladder Logic, Structured Text,
Sequential Function Chart, and Function
Block. These programming tools combined
with an intuitive operator interface (HMI)
platform would give Termoyopal the tools
to operate its power plant with much
greater facility than before.
The ability to easily network all the
units together also meant that all the unit
data could be viewed on HMI stations either
locally or remotely (Figure 1).
Execution
The plant upgrade began with the GE
Generating
Solutions for
CELEBRATING
YEARS
1983-2013
Frame 6B unit. The plant was conducting
a mechanical overhaul of the unit, and in
order to minimize the outage, Termoyopal
mobilized TTS technical advisors to
begin instrumentation upgrades and an
on-base unit rewire while the mechanical
works were still in progress. As part of
the system upgrade, TTS provided various
instrumentation enhancements, including
a performance monitor instrumentation
package and software algorithms to calculate
unit efficiency. With this information,
Termoyopal would be able to assess unit
historical performance and better determine
when to schedule unit maintenance
based on OEM recommendations. Other
instrumentation upgrades were installed
to improve available data from the unit
or improve reliability, including new flame
scanners and transmitters on the lube oil
and hydraulic oil circuits.
TTS then upgraded each of the Frame 5
units, replacing the existing turbine control
system and generator excitation and protection
systems. TTS performed the same onbase
rewire and instrumentation upgrades as
on the Frame 6. Two of the units were converted
from liquid-only operation to dual fuel
with the addition of gas fuel and fuel purge
systems. This work was carried out while in
the Sulzer Turbo Services Houston facility,
where a complete mechanical and electrical
overhaul and rehabilitation took place. The
new gas fuel systems included state-of-theart
all-electric stop and control valves, which
greatly simplified installation and gas fuel
operation.
All the units were equipped with a TTS
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POWER | October 2013
TMS-1000S control system, the simplex
version of the standard TMS-1000 turbine
control system, and aTMS-1000G digital
generator control and protection system.
The TMS-1000S is fully integrated with
the TMS-1000G through both hardwired
connections and communication connections
using industrial standard communications
protocols, such as Modbus,
to facilitate easy integration of functions
and the collection and presentation of
turbine and generator operational and
diagnostic information.
The TMS-1000S is built using the L72
ControlLogix processor. This allows the
TMS-1000S to be flexible in the ability
to accept a wide variety of signals, including
vibration with API 670 compliant
vibration modules. The TMS-1000G consists
of a digital AVR, digital generator
and transformer protection relays, synchroscope
with integrated check-synch,
automatic synchronizer, bus undervoltage
relays, and a generator multifunction
meter.
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POWER October 2013

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