GE N60 Instruction Manual page 14

PRODUCT DESCRIPTION
reception, any remote analog value can be re-sent, compared with another value or a constant threshold, added to or
subtracted from another local or remote analog value, subjected to the rate-of-change monitoring, and so on. This
powerful feature allows advanced applications, such as balancing power over wide areas, or adding extra security by
comparing local and remote measurements for consistency. It also facilitates simple telemetry.
Diagnostic features include an event recorder capable of storing 1024 time-tagged events, oscillography capable of
storing up to 64 records with programmable trigger, content, and sampling rate, plus data logger acquisition of up to 16
channels, with programmable content and sampling rate. The internal clock used for time-tagging can be synchronized
with an IRIG-B signal, using the Simple Network Time Protocol (SNTP) over the Ethernet port, or using the Precision Time
2
Protocol (PTP). This precise time stamping allows the sequence of events to be determined throughout the system. Events
can also be programmed (via FlexLogic equations) to trigger oscillography data capture that can be set to record the
measured parameters before and after the event for viewing on a computer. These tools significantly reduce
troubleshooting time and simplify report generation in the event of a system fault.
Several options are available for communication. A faceplate RS232 port can be used to connect to a computer to
program settings and monitor actual values. The rear RS485 port allows independent access by operating and engineering
staff. It can be connected to system computers with baud rates up to 115.2 kbps. All serial ports use the Modbus RTU
protocol. The IEC 60870-5-103 protocol is supported on the RS485 interface. IEC 60870-5-103, DNP, and Modbus cannot be
enabled simultaneously on this interface. Also only one of the DNP, IEC 60870-5-103, and IEC 60870-5-104 protocols can
be enabled at any time on the relay. When the IEC 60870-5-103 protocol is chosen, the RS485 port has a fixed even parity
and the baud rate can be either 9.6 kbps or 19.2 kbps. The 100Base-FX or 100Base-T Ethernet interface provides fast,
reliable communications in noisy environments. The Ethernet port supports MMS/UCA2, IEC 61850-90-5, Modbus/TCP,
TFTP, and PTP (according to IEEE Std. 1588-2008 or IEC 61588:2009(E)) protocols, and it allows access to the relay via any
standard web browser (N60 web pages). The IEC 60870-5-104 protocol is supported on the Ethernet port. The Ethernet
port also supports the Parallel Redundancy Protocol (PRP) of IEC 62439-3 (clause 4, 2012) when purchased as an option.
Secure Routable GOOSE (R-GOOSE) is supported with software options.
Settings and actual values can be accessed from the front panel or EnerVista software.
The N60 uses flash memory technology that allows field upgrading as new features are added. Firmware and software are
upgradable.
The following single-line diagram illustrates the relay functionality using American National Standards Institute (ANSI)
device numbers.
Table 2-1: ANSI device numbers and functions
Device number
25
27P
32
49
50DD
50G
50N
50P
51G
2-2
Function
Synchrocheck
Phase undervoltage
Sensitive directional power
Thermal overload protection
Disturbance detector
Ground instantaneous overcurrent
Neutral instantaneous overcurrent
Phase instantaneous overcurrent
Ground time overcurrent
N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL
Device number Function
51N Neutral time overcurrent
51P Phase time overcurrent
59P Phase overvoltage
67N Neutral directional overcurrent
67P Phase directional overcurrent
68 Power swing blocking
81O Overfrequency
81R Rate of change frequency
81U Underfrequency
CHAPTER 2: PRODUCT DESCRIPTION