for more ampacity, safety and transparency of Overhead Transmission Lines

OTLM

Real time monitoring and rating

OVERHEAD TRANSMISSION LINE MONITORING SYSTEM

OTLM (Overhead Transmission Line Monitoring) is a

system solution for monitoring and rating your exist-

ing or new overhead lines (OHL) based on real-time

monitoring of conductor temperature, sag, load, and

weather conditions. OTLM system supports more

efficient operation of OHL enhancing safety and flexi-

bility of grid operations. Dynamic operation supports

safe utilization of maximum capacity of OHL. OTLM

system aids in flexible and profitable operation of

assets. OTLM system with weather station and rating

software supports dynamic rating of OHL.

Efficiency: adding ampacity to your OHL.

Safety: alerting before critical loads and sag.

Flexibility: profitable utilisation of OHL and reaction on

transmission conditions.

Transparency: continuous data analyses of OHL.

The ampacity - current-carrying capacity of OHL - is

typically defined by average seasonal temperatures, with

limited cooling contribution from wind. This conserva-

tive approach might prove to be a missed opportunity.

OTLM system enables power utilities and system oper-

ators to increase ampacity of the existing OHL without

increasing the risk of equipment or system failure due to

higher loading.

The key elements for OHL dynamic thermal rating are

the conductor composition and construction, its tem-

perature and weather conditions along the OHL. While

considering the safety margins it is obvious that the key

information is the conductor temperature.

Dynamic versus static rating

Rated current (static rating) is defined on the basis of

conservative ambient conditions, conductor composition

and construction with high safety margins. Dynamic rat-

ing is a steady load that produces maximum operating

temperature computed on instantaneous basis for actual

loading, conductor temperature and weather conditions.

Sag measurement

OTLM system measures the OHL sag based on real time

inclination and conductor temperature measurements

that are combined within a mathematical model. For

additional sag accuracy, span measurements can be con-

ducted with a terrestrial laser scanner or a total station.

TECHNICAL BENEFITS

Engineering & Services

Installation, maintenance & integration with other system:

- definition of optimal position and number

of measuring points on OHL

- supervision of installation of OTLM device

- installation of servers and software

- commissioning

- maintenance of OTLM system

- uprating of OHL

- connection or integration of weather data

- connection to SCADA

- sag (clearance) measurements

- data analyses and management

Architecture

- Measurement unit (conductor temperature

conductor current, sag)

- CPU and communication with

mobile, WiFi, optics (OPGW)

- Power supply with current transformer

- Housing with fixing system

OTLM measures the temperature, the sag and the cur-

rent of power lines simultaneously. Measurements are

performed directly at the OTLM fixing points on the OHL

phase conductor and are transmitted to the OTLM Centre

via available communications channels with the exact GPS

time stamp. The current transformer and the supplying

unit provide power supply for the operation without any

other outside source of power supply.

Housing is made of fire resistant composite material for

heavy ambient conditions. In case of communication

failure data are stored locally in OTLM. Design of OTLM

and positioning of temperature sensors neutralize any

possible effect of ambient on precision of temperature

measurements of conductor. The installation is simple

and fast.

Communication

Communication system transmits measured values to con-

trol room via available communication channel.

OTLM system provides communication through mobile,

public/private channel and trough optic fibre (OPGW)

supporting a standardised IEC protocol with a GPS time

stamp. Measurements and high-resolution events are

transferred to the selected OTLM server and the control

centre (SCADA) via a standardised IEC protocol.

01 Under housing

- Inclination measurement- Humidity and ambient temp.

- Energy harvesting- Current measurement

02 Camera module

03 Temperature sensors

04 Current transformer

05 Fixing system - Live installation - Universal clamp

01

04

05

02

03

MONITORING & RATING

Monitoring, rating, adjusting, and alerting software

includes two direction communications (server-

OTLM).

OTLM Centre Software (web application):

- adjustable warning status of conductor on OHL (T>)

- adjustable alarm status of conductor on OHL (T>>)

- sag measurements

- setting of all OTLM parameters

- maximum connection: 1000 OTLM

- remote access

- GPS position with exact time stamp

for all OTLM measured data

- history data analyses

- report/import history data (.png, .jpeg, .gif, Excel)

Rating Architecture

- administrator service tools (adding

new OTLM, reports, etc.)

- different access levels

- easy user access via Web browser (service)

- connection or integration of weather data

- ampacity

- alert for icing (in early stage), clearance

and temperature

- connection to SCADA

- intuitive software

SCADA OTLM rating softwareOTLM and weather station

- Direct measurement of temperature,

current and sag (clearance)

- Ampacity

- Lightweight

- Easy installation (universal clamp)

- Intuitive software

- Connection to SCADA or other system

with standardized IEC protocol

- GPS position

- All measurements with exact GPS time stamp

- Two-stage alarm sending interval, triggered by

temperature of the conductor (T> and T »)

- Multiple communication protocol: mobile, optics, WiFi

- Local and remote access (setting of parameters)

- Data logging

- Open database

- No external power supply

GPS position and UTC clock

Notification triggered by ice or temperature

Housing - fire resistant composite material

Tested in accordance with:

IEC 60068-2-6

IEC 60068-2-31

IEC 60068-2-2

IEC 60068-2-1

IEC 60068-3-1

IEC 60068-2-14

IEC 60068-2-68

IEC 60529

IEC 60068-2-30

IEC 61000-4-2

IEC 61000-4-3

IEC 61000-4-4

SYSTEM BENEFITS & TECHNICAL DATA

Conductor temperature measurement

range from -40°C to +125°C

resolution 0.5°C

deviation ±2.0°C

Conductor current measurement

range from 65 A

resolution resolution 1 A

IEC 61000-4-5

IEC 61000-4-6

IEC 61000-4-8

IEC 61000-4-9

IEC 61000-4-10

IEC 61000-4-20

MIL-STD 810G - Method 509.5

MIL-STD 810G - Method 521.3

EN 303 446-1

EN 60950-1

EN 60950-22

Technical Data

Outside diameter (w x h) 300 x 296 mm

Length 300 mm

Weight approx. 9.0 kg

Diameter of a conductor from 15 to 45 mm

Min. operational current in conductor 65 A

Frequency 50 Hz. 60 Hz

Operating Temperature Range of OTLM from -40 to +85°C

Power Supply (current transformer) from 65 A

www.otlm.eu www.mosdorfer.com

Your direct contact:

OTLM, razvoj, proizvodnja in svetovanje, d.o.o.

Riharjeva ulica 38, 1000 Ljubljana, Slovenia

Phone +386 1 236 42 40, Fax: +386 1 283 40 25info@otlm.si

Mosdorfer GmbH

Mosdorfergasse 1, 8160 Weiz, Austria

Phone +43 3172 2505-0, Fax -29

office@mosdorfer.com

Wolfgang Troppauer, Business Unit Director MOVE:

Phone +43 664 403 92 80

wolfgang.troppauer@mosdorfer.com

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