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GE Multilin
B90 Low Impedance Bus Differential System
2-1
2 PRODUCT DESCRIPTION
2.1 INTRODUCTION
2
2 PRODUCT DESCRIPTION 2.1INTRODUCTION
2.1.1 OVERVIEW
The B90 Low Impedance Bus Differential System is a microprocessor-based architecture that provides protection and
metering for busbars with up to 24 feeders. The B90 protection system is a centralized architecture built on one B90 IED as
per requirements of a particular application. The IED is a full-featured B90 and as such can be accessed and programmed
individually. Protection and supervisory functions of the B90 include:
•
Multi-zone differential protection with both restrained (percent, biased) and unrestrained (unbiased, instantaneous)
functions incorporated. Differential protection is fast (typical response time: ¾ of a power cycle; maximum response
time: 1 power cycle) and secure. Security is achieved by using fast and reliable CT saturation detection algorithm and
a second, phase comparison operating principle.
•
Check-zone functionality is provided by programming one of the differential zones to enclose the entire bus
•
Dynamic bus replica functionality and multi-zone protection allowing application of the B90 to multi-section re-configu-
rable busbars
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Isolator monitoring feature monitors up to 48 isolators from the B90 IED
•
End fault protection (dead zone protection) is provided for up to 24 breakers
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CT trouble monitoring function is provided for each zone of differential protection
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Breaker fail function is provided for up to 24 breakers
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An instantaneous overcurrent function is available per each current input of the B90 system
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A time overcurrent function is available per each current input of the B90 system for backup protection
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An undervoltage function is provided per each voltage input of the B90 system for supervision purposes
Voltage and current metering is built into the relay as a standard feature. Current parameters are available as total wave-
form RMS magnitude, or as fundamental frequency only RMS magnitude and angle (phasor).
Diagnostic features include an event recorder capable of storing 1024 time-tagged events and oscillography capable of
storing up to 64 records with programmable trigger, 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 Protocol (PTP). This precise time stamping allows the sequence of events to be determined
between the B90 IEDs and 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 for the pro-
gramming of settings and the monitoring of actual values. The RS232 port has a fixed baud rate of 19.2 kbps. 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 IEC 61850, Modbus/TCP, and TFTP protocols, PTP (according to IEEE Std. 1588-2008 or IEC
61588), and 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.
Settings and actual values can be accessed from the front panel or EnerVista software.
The B90 IEDs use flash memory technology, which allows field upgrading as new features are added. The following
Single
line diagram
illustrates the relay functionality using ANSI (American National Standards Institute) 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 detailed information on the maximum number of zones and inputs for a given
model. In addition, different applications can require differing numbers of B90 IEDs with different hardware
configurations.
Содержание B90
Страница 10: ...x B90 Low Impedance Bus Differential System GE Multilin TABLE OF CONTENTS ...
Страница 50: ...2 20 B90 Low Impedance Bus Differential System GE Multilin 2 3 SPECIFICATIONS 2 PRODUCT DESCRIPTION 2 ...
Страница 118: ...4 28 B90 Low Impedance Bus Differential System GE Multilin 4 3 FACEPLATE INTERFACE 4 HUMAN INTERFACES 4 ...
Страница 284: ...5 166 B90 Low Impedance Bus Differential System GE Multilin 5 8 TESTING 5 SETTINGS 5 ...
Страница 334: ...10 8 B90 Low Impedance Bus Differential System GE Multilin 10 2 BATTERIES 10 MAINTENANCE 10 ...
Страница 338: ...A 4 B90 Low Impedance Bus Differential System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Страница 460: ...C 30 B90 Low Impedance Bus Differential System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Страница 476: ...E 10 B90 Low Impedance Bus Differential System GE Multilin E 1 IEC 60870 5 104 APPENDIX E E ...
Страница 502: ...viii B90 Low Impedance Bus Differential System GE Multilin INDEX ...