2. _____________________________________________________________________________
LIQ-60 Design Specifications 2 of 5 Copyright GridSense 2012
1.0 INTRODUCTION
The LineIQ monitoring system allows electricity utilities and other operators of high and medium voltage
overhead conductor distribution and transmission lines to monitor and respond to faults and load changes on
the supply grid. Additionally, the LineIQ logs load current, conductor temperature & ambient temperature and
displacement power factor. The monitoring system consists of Conductor Mounted Sensors (CMS), data
collators (LIQ-Gateways), and remote or on-site PC-based analysis and control software. The LineIQ system
links to existing SCADA or Distribution Management systems. The CMS communicate with the data collators
(LIQ-Gateways) using short range radio. The LIQ-Gateway and CMS can also communicate with on-site PCs
(e.g. laptop) using short range radio, when an LIQ-LocalLink is connected to the PC. The LIQ-Gateways in
turn communicate with control rooms via a cellular modem or long range radio links, and can use a variety of
different communication standards.
2.0 TECHNICAL SPECIFICATIONS
2.1 LIQ-60 Specifications
2.1.1 General Specification
Item Description
Weight 2kg (4.4lb)
Humidity range 0 % to 100 %
Dimensions
Height: 315mm (12.4 in), Depth: 180mm (7 in),
Width: 140mm (5.5 in)
Status indicators Three high intensity LEDs, 2x red & one amber
Communication
Local-RF
Communication
RF range 30m (100ft)
line of sight.
3. _____________________________________________________________________________
LIQ-60 Design Specifications 3 of 5 Copyright GridSense 2012
2.1.2 Technical Specification
Item Description
Application
MV / HV overhead distribution networks, 4 wire,
multiple grounds, 3 wire, single phase, SWER and
mixed circuit installations.
Line voltage 5kV to 138kV
Frequency
Fault detection range: 5 – 25,000A
Load logging range: 1 – 25,000A (Accuracy +/- 5% or
+/- 1 A, whichever is greater).
Trigger principle
Algorithms based on electrical current ratios, adaptive
to the line signature i.e. load and voltage history. Inrush
restraint.
Memory
Total Memory = 196 Kbytes available.
Event data = 32 Kbytes
Load log = 164 Kbytes (optional)
Logged data
Time stamped, pre and post voltage status, pre and
post current values, 200ms of fault current waveform
(60ms pre and 140ms post fault), 2
nd
harmonic
calculations.
Battery specifications
4 x 2V, 2.5Ah rechargeable sealed lead acid battery
(SLA Battery), 10 years life typ.
Power source
Dual power circuitry – Solar panel and internal
SLA Battery
Current use Normal operation (No RF Transmission) = 5mA.
Clamping mechanism
A spring loaded conductor clamp. Mounting and de-
mounting by means of hot stick.
Conductor size Approx. 6mm (0.25 inch) – 32mm (1.25 inch) diameter.
Temperature ranges
Ambient operating
range
- 40
o
C to +70
o
C (- 40
o
F to
+160
o
F)
Range for accuracy
- 20
o
C to +65
o
C (- 4
o
F to
+120
o
F)
Conductor operating
range
- 40
o
C to +130
o
C (- 40
o
F
to +265
o
F)
Conductor, guaranteed
accuracy
- 20
o
C to +90
o
C (- 40
o
F to
+195
o
F)
4. _____________________________________________________________________________
LIQ-60 Design Specifications 4 of 5 Copyright GridSense 2012
2.2 LIQ-Gateway Specifications
2.2.1 Interfaces
Item Description
Internal Modem
RS232 connector and power.
1 start bit, 8 data bits, no parity & 1 stop bit with
RTS/CTS flow control.
RS232: male DB15 connector. Baud rates 1200, 2400,
4800, 9600, 14400, 19200, 28800, 33600 & 57600
baud.
PCB socket: TTL logic. Baud rates 1200, 2400, 4800,
9600, 14400, 19200, 28800, 33600 & 57600 baud.
Ethernet interface
port
10/100 MHz 10-base-T
Global Positioning System
(GPS)
50-channel GPS receiver with -160dBm sensitivity,
active antenna and accurate time keeping.
Communication protocols DNP3, IEC 61850 & Web Services.
2.2.2 Mechanical and Power
Item Description
Display Multi-colour high intensity LEDs
Power Consumption 8 mA at 12 V DC with no active communications
AC Power 110 or 230 V AC, 50 Hz or 60 Hz
Solar Power External 12 V, 20 W solar panel
DC Power 14 to 15 V DC rated at 1 A
Main Battery 12 V 5 Ah rechargeable sealed lead acid
Backup battery
Magnesium dioxide lithium coin, CR 2032, 3 V, ~225
mAh, operating temperature range -30° to +60° C (-22
to 140°F).
Dimensions
(l x w x d)
510 mm x 295 mm x 160 mm, (20 in x 11
5
/8 in x 6
5
/16
in)
Weight
7.6 kg (17 lbs.) LIQ-Gateway only, 15kg (33 lbs.)
typical with accessories in shipping case
