Basler Electric BE1-700 - Manual (Page 13)

SECTION 1
• GENERAL INFORMATION
DESCRIPTION
The BE1-700 Digital Protective Relay is an economical, microprocessor based, multifunction system that
is available in a panel mount, non-drawout case. The relay can be purchased as a current relay (BE1-
700C) or as a voltage relay (BE1-700V). In this manual, function headings will note in parenthesis
whether it applies to a current or voltage relay. (See Figures 1-1 and 1-2.) Depending on the type of relay,
the BE1-700 features include the following. Functions are shown as C (current), V (voltage) or A (all -
either current or voltage).
• C Three-phase Overcurrent Protection
• C Ground Overcurrent Protection
• C Negative-Sequence Overcurrent Protection
• C Breaker Failure Protection
• V Voltage Protection
• V Frequency Protection
• A Control Protection
• A Communication
• A Breaker Monitoring
• A Metering Functions
• A Automatic Reclosing (optional)
BE1-700 relays have four programmable contact sensing inputs, five programmable outputs, and one
alarm output. Outputs can be assigned to perform protection, control, or indicator operations through
logical programming. For example, protection functions could be programmed to cause a protective trip.
Control functions could be programmed to cause a manual trip, manual close or automatic reclose.
Indicators could be configured to annunciate relay failure, a settings group change, and others.
Protection scheme designers may select from a number of pre-programmed logic schemes that perform
the most common protection and control requirements. Alternately, a custom scheme can be created
using BESTlogic
™.
A simplified "How to Get Started" procedure for BE1-700 users is provided in Section 2, Quick Start.
FEATURES
The BE1-700 family includes many features for the protection, monitoring, and control of power system
equipment. These features include protection and control functions, metering functions, and reporting and
alarm functions. A highly flexible programmable logic system called BESTlogic allows the user to apply
the available functions with complete flexibility and customize the system to meet the requirements of the
protected power system. Programmable I/O, extensive communication features and an advanced human-
machine interface (HMI) provide easy access to the features provided.
The following information summarizes the capabilities of this multifunction device. Each feature, along
with how to set it up and how to use its outputs is described in complete detail in the later sections of this
manual.
Input and Output Functions
Input functions consist of power system measurement and contact sensing inputs. Programmable contact
outputs make up the output functions.
Power System Measurement Functions
Three-phase currents or voltages are digitally sampled and the fundamental is extracted using a discrete
fourier transform (DFT) algorithm.
The voltage sensing circuits can be configured for single-phase, three wire or four wire voltage
transformer circuits. Voltage sensing circuitry provides voltage protection, frequency protection, and
metering. Neutral (residual) and negative-sequence voltage magnitudes are derived from the three-phase
voltages. Digital sampling of the measured frequency provides high accuracy at off-nominal values.
An auxiliary voltage sensing input provides protection capabilities for over/undervoltage monitoring of the
first and third harmonic of the VT source connected to the Vx input. This capability is useful for ground
fault protection or sync-check functions.
9376700990 Rev M BE1-700 General Information 1-1