Description - GE B90 Instruction Manual

PRODUCT DESCRIPTION
Several options are available for communication. An RS232 port (USB port with the graphical front panel) can be used to
connect to a computer for the programming of settings and the monitoring of 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-TX Ethernet interface provides fast, reliable communications in noisy environments. The Ethernet
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port supports IEC 61850, Modbus/TCP, TFTP, and PTP (according to IEEE Std. 1588-2008 or IEC 61588), and it allows access
to the relay via any standard web browser (B90 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 B90 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.
The available zones of differential protection and their size (maximum number of inputs) are optional and
controlled by the software option portion of the order code. The breaker failure function is also optional. See
the ordering section for information on the maximum number of zones and inputs for a given model. In
addition, different applications can require differing numbers of B90s with different hardware configurations.
Table 2-1: ANSI device numbers and functions supported
Device Function
number
27 Undervoltage
50 Instantaneous overcurrent
50/74 CT trouble
50/87 Unrestrained bus differential
2-2
Device Function
number
51 Time overcurrent
50BF Breaker failure
50EF End fault protection
B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CHAPTER 2: PRODUCT DESCRIPTION