Basler BE1-51B Manual - Features
BE1-50/51B Retrofit Kits
FEATURES
• 15 field selectable, inverse, fixed time and British
Standard (BS142) time overcurrent curves on 200
series relays (10 on 100 series).
• Time characteristics extend to 40 X Pickup.
• Instantaneous overcurrent function.
• Wide setting ranges:
Time Overcurrent: 0.5 to 15.9 (5 Amp Unit)
0.1 to 3.18 (1 Amp Unit)
Inst. Overcurrent: 2.0 to 99 (5 Amp Unit)
0.2 to 19.8 (1 Amp Unit)
Inst. Overcurrent B: (on equipped models)
1.0 to 15.9 (5 Amp unit)
0.2 to 3.18 (1 Amp unit)
• Current pickup accuracy ± 2%.
• Timing accuracy ± 2%.
• Continuous automatic calibration.
• Less than 10% transient overreach.
• Zero Pickup setting for safety during installation.
• Timed Overcurrent Reset - Selectable Instantaneous
or Decay Characteristic (200 series relays only).
• 5VA burden (at nominal) self powered from 50/60 Hz
systems, utilizes standard 5 or 1 Amp CT secondaries.
• Drawout construction.
• Manual method for trip circuit testing.
• Standard magnetically latched targets for TOC
and IOC.
• Direct reading front panel controls.
• Positive visual indication that microprocessor is
executing code.
• UL recognized under standard 508.
• Qualified to the requirements of:
-IEEE C37.90.1 for SWC.
-IEEE C37.90.2 for RFI.
-IEC 255-5 for impulse.
APPLICATION
The BE1-50/51B is a single phase self powered, micro-
processor based time overcurrent relay. The relay is
designed for use in applications requiring time delayed
coordination for phase or ground overcurrent conditions.
The relay can be used to provide coordinated protection
for overhead and underground distribution circuits. Other
applications include overcurrent back-up protection for
transformers and generators, the protection of neutral
grounding resistors and reactors, and motors.
Since all of the time-current characteristics are included
within the relay, a standard relay may be ordered before
the coordination study is completed, thereby allowing the
physical construction to proceed. See Table 1 for avail-
able curve types. This is also an advantage as changes in
the system configuration or coordination may be accom-
plished without a hardware change.
All models include memory to replicate the decaying reset
of electromechanical relays even when power to the relay
is lost. Use this function for applications that require
coordination with the resetting of nearby electromechani-
cal relays.
An instantaneous overcurrent element is standard in the
relay. This element is designed to minimize transient
overreach. The "A" instantaneous element includes select-
able delay characteristics for improved coordination with
downstream devices and customer requirements. Three
instantaneous units are standard with the
BE1-50/51B-230, -234, and -239, replacements for the
IAC66K motor protection relay. BE1-50/51B models -235
through -238 and -241 include a second sensitive instan-
taneous element for arc flash mitigation applications.
2
Figure 1 - Functional Block Diagram - Models with 2 Instantaneous