2-2 C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
PRODUCT DESCRIPTION CHAPTER 2: PRODUCT DESCRIPTION
2
Several options are available for communication. An RS232 port (USB port with the graphical front panel) 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. 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
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 (C70 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 C70 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 supported
Device
number
Function Device
number
Function
27P Phase undervoltage 59N Neutral overvoltage
50BF Breaker failure 59NU Neutral voltage unbalance
50DD Disturbance detector 59P Phase overvoltage
50G Ground instantaneous overcurrent 59X Auxiliary overvoltage
50N Neutral instantaneous overcurrent 59_2 Negative-sequence overvoltage
50P Phase instantaneous overcurrent 60N Bank neutral current unbalance
50_2 Negative-sequence instantaneous overcurrent 60P Bank phase current unbalance
51G Ground time overcurrent 67N Neutral directional overcurrent
51N Neutral time overcurrent 67P Phase directional overcurrent
51P Phase time overcurrent 67_2 Negative-sequence directional overcurrent
51_2 Negative-sequence time overcurrent 87V Bank voltage differential
59B Bank phase overvoltage
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