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1.1
IINTRODUCTION
MDAR (REL-300) version 2.60 is a special design for
China. It meets the general operation practices in
China.
MDAR (REL-300) version 2.60 is a microcontroller-
based line protection system. All measurement, pro-
tection and logic functions are performed by numeri-
cal/digital means. The basic relay provides three
zones of distance protection with instantaneous
directional high set trip and directional inverse time
overcurrent ground backup functions. MDAR (REL-
300) version 2.60 also has metering, fault location,
oscillographic and communication capabilities.
The capabilities of the basic MDAR (REL-300) ver-
sion 2.60 can be expanded to include any one or all
of the optional functions, such as out-of-step block,
pilot zone and single-pole trip. It may be used for
transmission line protection at any voltage level.
1.2
MAJOR DIFFERENCES BETWEEN
VERSIONS 2.60 AND 2.10
The hardware of the MDAR (REL-300) version 2.60
is the same as the standard MDAR (REL-300) ver-
sion 2.10, except the software is modified in the fol-
lowing areas:
1.2.1
Out-of-step logic.
(a)
OSB function is selectable. The selected OSB
blocks Z1/Z2 /pilot 3Ø-unit only. (note, it does
not supervise Z3).
(b)
The logic of using double blinder with OS timer
for OS detection is similar to the OS logic in the
standard MDAR (REL-300) version 2.10,
except the OS timer is changed from 50/0 to
50/(500, 1000) ms (i.e., setable reset timer).
(c)
For Z1 and pilot OSB, besides the normal logic
of [(21BO and not 21BI) and (OS timer)] for
supervision, an 200/(500, 1000) ms timer and
logic are added to the circuit for blocking when
the 21BI is operated for longer than 200 ms.
(d)
Separated out-of-step override timers, OSOT1
and OSOT2, for Z1 and Z2. Timer range is
(500, 1000/0) ms in stead of 400-4000/0 ms.
Section 1. PRODUCT DESCRIPTION
1.2.2
Single pole trip logic.
(a)
Use trip signals TRSLA, TRSLB, TRSLC and
the resetting of faulted phase current signal for
pole-disagreement identification.
(b)
The SPF, ROF and 62T logic for SPT have
been modified.
1.2.3
Due to the hardware limitation, the Stub bus
and 3-terminal protection function are not available in
version 2.60.
1.2.4
Load restriction for long line application is not
included in version 2.60 based on the specification
(refer to EPRI's Figure 1, dated 6/92).
1.2.5
Optional programmable output contact
arrangement is not available in version 2.60.
1.2.6
External wirings are different from the ver-
sion 2.10.
1.3
MDAR (REL-300) DESIGN CONCEPTS
The MDAR (REL-300) design concept is to provide a
design that combines ABB's relay design, manufac-
turing and application experience with new technol-
ogy to insure a product that will meet the needs of a
broad range of electric utility operations to satisfy
today's requirements and provide direction for tomor-
row's solutions, with hardware design simplicity and
increased software functionality.
1.3.1
The MDAR (REL-300) is designed for the
protection engineer
It enables the engineer to easily apply the appropri-
ate functional capabilities of MDAR (REL-300) to
meet a specific applications requirement.
Fault data and oscillographic information are also
available through remote communications to aid the
engineer to more effectively analyze system faults
and relay operations for future system design consid-
eration.
1.3.2
The MDAR (REL-300) is designed for system
operations
It provides operations the means to quickly access
fault location data, thereby minimizing transmission
line outage times.
I.L. 40-385.5
1-1
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