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Power Line Carrier Systems
 

TDMS-Plus Power Line Carrier Communication:

CG Automation`s Power Line Carrier products use a 5,180 Hz carrier for two-way communication over the primary and secondary power distribution lines emanating from utility`s substation to reach devices located anywhere on the utilities power lines. In addition to control of capacitor banks, circuit breakers, sectionalizing switches, and reclosers; Our PLC devices can reduce the time and cost of diagnosing faults by monitoring power, voltage, current, power factors, temperature or other analog quantities at any point along the distribution feeder lines.

The excellent propagation characteristics of our 5,180 Hz carrier signal extends communication throughout the area serviced by each substation without the need for signal boosters or store and forward repeaters. Our carrier frequency, modulation and coupling techniques are the result of extensive research on the properties of power distribution systems as a communications medium. Power distribution systems constructed in accordance with REA standards and practices are generally ideal for CG Automation`s Distribution Line Carrier communications technique.

Carrier Signal:
Our low frequency 5,180 Hz carrier signal propagates through step down transformers and long feeder lines much better than higher frequency carrier systems. And Our Distribution Line Modem achieves a superior signal to noise ratio by using the 60 Hz power signal as the time base to derive its 5,180 Hz carrier frequency, placing the 60 Hz power harmonics in the exact nulls of the transmitted carrier signal energy. Automatic gain control circuits give the receiver a dynamic operating range of 36 dB.

Signal Modulation:
The 20 Hz, 2-phase DPSK modulation used to transmit from the substation to the end devices is is more immune to the high noise levels on the far ends of the power distribution system feeders. The 40 Hz 4-phase DPSK modulation used to transmit from the end devices back to the substation has a higher throughput for returning data and its reception is less effected by the relatively clean electrical environment of the substation power bus.

Signal Coupling:
Our Distribution Line Modem couples the carrier signal through matched single-phase distribution transformers on each phase, producing a balanced carrier signal on all three phases of the power bus with zero phase shift between the three lines. Natural capacitive coupling of the carrier between the three lines and through 3-phase capacitor banks restores balance of the signal between the three phases and enhances propagation.

Distribution Line Modem:
Our DLM-6100 Distribution Line Modem is installed in an STN-9150 Substation Terminal Node, and inserts a 5,180 Hz carrier signal on up to four (4) three-phase power busses. The TDMS-Plus Master Station and STN-9150 software identify which power bus the outgoing messages need to be transmitted on to reach the target field devices. The distributed intelligence in each STN-9150 Substation Terminal Node handles the tasks of polling for data and executing controls at the end devices within its communication range. This provides the TDMS-Plus Master Station with a single point of communication for hundreds of end device locations.

DAU-8010 Distribution Automation Unit:
The DAU-8010 is a poll or wall mounted unit in a rugged outdoor enclosure for monitoring and control of capacitor banks, circuit breakers, sectionalizing switches, and reclosers located along power feeder lines downstream from the substation. The DAU-8010 uses 5,180 Hz carrier for two-way communication over the primary and secondary power distribution lines emanating from utility`s substation and contains a distribution line modem, control relays, digital and analog I/O circuitry, microprocessor, and nonvolatile memory.

Specifications:
Control Outputs: 4, 240 Vac, 10A contacts
Analog Inputs: 5, ±1ma, ±20 ma
Status Inputs: 4
Accumulator Inputs: 2
Transmitted Signal: 5,180 Hz, synchronous 4-phase DPSK modulation
Receive Signal: 5,180 Hz, synchronous 2-phase DPSK modulation
Enclosure: NEMA4, pole-top or wall mounted, 20"H x 16"W x 9"D
Power: 120/240 Vac, 60 Hz
Environment: -40?C to +70?C, 5 to 100% humidity
Surge Withstand: IEEE 472-1974

LVT-8040 Line Voltage Transponder:
The LVT-8040 is a pole or wall mounted unit in a rugged outdoor enclosure which measures and stores power line voltage information at points along power feeder lines downstream from the substation. End-of-line voltage measurement by LVT`s can be used to directly control regulation at the substations. 24 hour survey data stored by LVT`s provides information for long range planning in load management schemes or reconfiguration of the distribution system.

The LVT-8040 uses 5,180 Hz carrier for two-way communication over the primary and secondary power distribution lines emanating from utility`s substation and eliminates the need to install or lease separate communication facilities or to dispatch personnel to pick up the readings. Each LVT can report: the current voltage; the minimum and maximum voltages during a weekly or monthly period; and a daily 24 hour survey.

Specifications:
120V range 240V range
Input Range: 100 to 135 VRMS 200 to 270 VRMS
Accuracy: ±.2 volt ±.4 volt
Sample Rate: 1 sec. 1 sec.
Survey: Hi/Low average - 15 min intervals – 24 hour capacity
Power Loss: 16 bit counter
Transmitted Signal: 5,180 Hz, synchronous 4-phase DPSK modulation
Receive Signal: 5,180 Hz, synchronous 2-phase DPSK modulation
Enclosure: Non-metallic NEMA 4, 12.5"H x 10.5"W x 7.25"D
Power: 120/240 Vac, 60 Hz
Environment: -40?C to +70?C, 5 to 100% humidity
Surge Withstand: IEEE 472-1974

AIM-7011 Addressable Intelligent Meter:
The AIM-7011 is a pole or wall mounted unit in a rugged outdoor enclosure which measures and stores power demand and energy consumption from meters with pulse initiator outputs at points along power feeder lines downstream from the substation. The AIM-7011 microprocessor computes KW, KWH, and KVARH and stores them in time-of-use categories: peak, shoulder, off-peak. The AIM-7011 also records and reports 24 hour demand survey data stored in 15 minute intervals. The AIM-7011 uses 5,180 Hz carrier for two-way communication over the primary and secondary power distribution lines emanating from utility`s substation.

CVT-8020 Communication Verification Transponder:
The CVT-8020 is a pole or wall mounted unit in a rugged outdoor enclosure which rapidly isolates faults by verifying communication specific points along power feeder lines using a 5,180 Hz carrier for two-way communication over the primary and secondary power distribution lines emanating from utility`s substation


Scope  
Application AreasStandardContact
Monitor & control downline devices beyond the Substation fence
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