IEEE Electrification Magazine - December 2015 - 25

Corporate
Headquarters

GPS Time
Stamp

AHC

Corporate
Network
Station
GHM 1

Firewall
SCC: System Control Center
RCC: Regional Control Center
GMD DB: GMD Database
AHC: Asset Health Center
GHM: GIC/Harmonics Monitoring

Station
GHM 2

Station
GHM n

RCC n

Station
GHM 1

GMD
DB
SCC (Backup)

Station
GHM 1

SCC

RCC 1
Station
GHM 2

Station
GHM 2

RCC 2

Station
GHM n

Station
GHM n

Secure
Laptop

Secure Remote
Access Server

Figure 3. GMD-an overview.

provides standard outputs of either ac/dc current
(e.g., 4-20 mA) or dc voltage (e.g., ±5 Vdc or ±10 Vdc). It is preferable to choose ±10-Vdc output to feed into a GIC relay.
There are different design options available such as
solid- or split-core. For a new transformer, it is desirable to
choose the solid-core design. The split-core design can be
used for a retrofit installation without outage requirements.
The Hall-effect sensor can be chosen from different sizes
based on the range of dc to be measured. Appropriate sensor size must be chosen to fit transformer neutral insulated
cables. It is recommended that the dc sensor accommodate
at least ±500-A dc current with 0.5% accuracy over an
extended temperature range from -40 °C to +60 °C.
Hall-effect transducers should be tested for accuracy.
Additional tests such as environmental tests, measuring dc

with an ac background, should also be performed to determine acceptance.

GIc relay
The GIC relay converts transducer analog output signals into
numerical values. A transformer neutral lead may have a significant 60-Hz current (maybe as high as 100 A or more) due
to system imbalance induced by untransposed lines, mismatched single-phase equipment, or unbalanced loading;
hence, a built-in low-pass filter with cutoff frequency of 2-3 Hz
is required to filter out the ac components. The GIC relay will
pass GIC monitoring data via fiber to RTU or station computer in the control house (Figure 4) using distributed network
protocol (DNP) 3.0 or International Electrotechnical Commission 61850 protocol over multimode fiber. DNP 3.0 protocol
IEEE Elec trific ation Magazine / d ec em be r 2 0 1 5

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Table of Contents for the Digital Edition of IEEE Electrification Magazine - December 2015

IEEE Electrification Magazine - December 2015 - Cover1
IEEE Electrification Magazine - December 2015 - Cover2
IEEE Electrification Magazine - December 2015 - 1
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IEEE Electrification Magazine - December 2015 - Cover3
IEEE Electrification Magazine - December 2015 - Cover4
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http://www.nxtbook.com/nxtbooks/pes/electrification_september2015
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