Basler BE1-81 User manual
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W A R N I N G !
To avoid personal injury or equipment damage, only
qualified personnel should perform the procedures
presented in this manual.
INTRODUCTION
This Instruction Manual provides information concerning the
operationandinstallationoftheBE1-81DigitalUnderfrequencyRelay.
To accomplish this, the following is provided.
Specifications
Functional Characteristics
Mounting Information
Connections
Testing
ii
CONFIDENTIAL INFORMATION
OF BASLER ELECTRIC COMPANY, HIGHLAND, IL. IT IS LOANED FOR
CONFIDENTIAL USE, SUBJECT TO RETURN ON REQUEST, AND WITH THE
MUTUAL UNDERSTANDING THAT IT WILL NOT BE USED IN ANY MANNER
DETRIMENTAL TO THE INTEREST OF BASLER ELECTRIC COMPANY.
First Printing: October 1979
Printed in USA
© 1995, Basler Electric Co., Highland, IL 62249
May 1996
It is not the intention of this manual to cover all details and variations
in equipment, nor does this manual provide data for every possible
contingency regarding installation or operation. The availability and
design of all features and options are subject to modification without
notice. Should further information be required, contact Basler
Electric Company, Highland, Illinois.
BASLER ELECTRIC, BOX 269 HIGHLAND, IL 62249 USA
PHONE 618-654-2341 FAX 618-654-2351
iii
CONTENTS
SECTION 1 GENERAL INFORMATION 1-1
Purpose ...................................................... 1-1
Description .................................................... 1-1
Definite Time Option ......................................... 1-1
Inverse Time Option .......................................... 1-1
Relay Assembly ............................................. 1-1
Model and Style Number Description ................................ 1-1
Sample Style Number ........................................ 1-4
Style Number Identification Chart ............................... 1-4
Specifications .................................................. 1-5
SECTION 2 CONTROLS AND INDICATORS 2-1
SECTION 3 FUNCTIONAL DESCRIPTION 3-1
Functional Description ........................................... 3-1
Sensing ................................................... 3-1
Power Supply ............................................... 3-2
Power Supply Status Contacts .................................. 3-2
Voltage Inhibit Circuit ......................................... 3-2
Input Conditioning Circuit ...................................... 3-2
Crystal Reference Oscillator ................................... 3-2
Synchronizer Circuit .......................................... 3-3
Reference Circuit ............................................ 3-3
Period Difference Circuit ...................................... 3-3
Period Difference To Frequency Difference Circuit .................. 3-3
Threshold Setting Comparator .................................. 3-3
Definite Time Delay Circuit (Timing Option E1) ..................... 3-3
Inverse Time Delay Circuit (Timing Option D1) ..................... 3-3
Relay Output ............................................... 3-3
Internally Operated Target Driver ................................ 3-4
Current Operated Target Driver ................................. 3-4
Target Indicator ............................................. 3-4
SECTION 4 INSTALLATION 4-1
General ....................................................... 4-1
Relay Operating Precautions ...................................... 4-1
Dielectric Test .................................................. 4-1
Relay Mounting ................................................ 4-1
S1 Case, Panel Drilling Diagram, Semi-Flush Mounting .............. 4-2
S1 Case, Outline Dimensions, Front View ......................... 4-2
S1 Case, Single-Ended, Semi-Flush Mounting, Side View ............ 4-3
S1 Case, Single-Ended, Semi-Flush Mounting, Outline Dimensions ..... 4-4
S1 Case, Single-Ended, Projection Mounting, Panel Drilling Diagram .... 4-5
S1 Case, Single-Ended, Projection Mounting, Rear View ............. 4-6
S1 Case, Single-Ended, Projection Mounting, Side View ............. 4-7
S1 Case, Double-Ended, Semi-Flush Mounting, Side View ............ 4-8
S1 Case, Double-Ended, Semi-Flush Mounting, Outline Dimensions .... 4-9
iv
CONTENTS - Continued
SECTION 4 INSTALLATION - Continued
Relay Mounting - Continued
S1 Case, Double-Ended, Projection Mounting, Panel Drilling Diagram . . . 4-10
S1 Case, Double-Ended, Projection Mounting, Rear View .............4-11
S1 Case, Double-Ended, Projection Mounting, Side View .............4-12
Connections ...................................................4-13
AC Sensing Input Connections ..................................4-13
DC Control Connections .......................................4-14
Internal Connections, Style Number T?E ?1? A0S5? .................4-15
Internal Connections, Style Number T?E ?1C A2S5? ................4-16
SECTION 5 TESTING 5-1
General .......................................................5-1
Test Setup .....................................................5-1
Definite Time Delay (Option E1) Test Procedure .......................5-2
Inverse Time Delay (Option D1) Test Procedure .......................5-3
SECTION 6 MAINTENANCE 6-1
General .......................................................6-1
In-House Repair ................................................6-1
Storage .......................................................6-1
Test Plug ......................................................6-2
SECTION 7 Manual Change Information 7-1
1-1
SECTION 1
GENERAL INFORMATION
PURPOSE
BE1-81 Digital Underfrequency Relays are single-phase, solid-state, protective devices designed to
detect an underfrequency condition and provide an output to actuate external control circuits and/or
alarms. Both 50 hertz and 60 hertz styles are available with either definite time delay or inverse time
delay characteristics.
DESCRIPTION
BE1-81 relays compare the frequency of the applied voltage with a crystal oscillator reference frequency.
When the measured frequency is less than a preset level for a predetermined period of time, external
control circuits and/or alarms are actuated by the relay.
Definite Time Option
Definite time option trip frequency settings are set by three front panel thumbwheel switches. Setting
ranges are between 0.05 and 5.00 hertz in 0.05 hertz increments below nominal system frequency. The
delay time (measured in cycles of the underfrequency waveform) is set by two front panel thumbwheel
switches. Delay ranges are from 01 to 99 cycles. The actual trip time is the delay time setting, plus one
cycle.
Inverse Time Option
Inverse time option trip frequency settings are also set by three front panel thumbwheel switches and the
ranges are from 0.05 to 5.00 hertz in 0.05 hertz increments below nominal system frequency. The
inverse time delay characteristic is inversely proportional to the magnitude of the frequency difference
between the measured waveform and the trip frequency setting. This time may be adjusted to
correspond to a particular characteristic curve by a continuously adjustable front panel time dial. (Refer
to Figures 1-1 and 1-2.)
Relay Assembly
The relay assembly is mounted in a drawout cradle and enclosed in a standard, utility style, semi-flush
case. Individual circuit components are accessible by removal of the individual printed circuit boards
from the relay cradle and using an extender card (Basler part number 9 1655 00 100) to test or
troubleshoot. A front panel, electrically operated, manually reset target may be selected to indicate that a
fault has occurred and the relay has operated. A wide range of options permits the relay to be
specifically tailored to a variety of applications.
MODEL AND STYLE NUMBER DESCRIPTION
BE1-81 Digital Underfrequency Relays electrical characteristics and optional features are defined by a
combination of letters and numbers that make up its style number. The model number, together with the
style number, describe the options included in a specific device, and appear on the front panel, drawout
cradle, and inside the case assembly. Upon receipt of a relay, be sure to check its style number against
the requisition and packing list, to see that they agree.
BE1-81 General Information
1-2
Figure 1-1. Inverse Time Curves, 50 Hertz Option
BE1-81 General Information
1-3
Figure 1-2. Inverse Time Curves, 60 Hertz Option
BE1-81 General Information
1-4
Sample Style Number
Style number identification chart (Figure 1-3) defines the electrical characteristics and operational
features included in BE1-81 relays. For example, if the style number were T1E-E1C-A0N0F, the device
would have the following:
(T) Single phase sensing input type
(1) 120 Vac, 60 hertz nominal sensing input range
(E) One normally open relay output
(E1) Definite time delay
(C) Internal operating power obtained from 125 Vdc or 100/120 Vac - external source
(A) One internally operated target
(0) Internal relay operating power independent of sensed voltage
(N) No Option 2 available
(0) No auxiliary output
(F) Semi-flush mounting
Figure 1-3. Style Number Identification Chart
BE1-81 General Information
1-5
SPECIFICATIONS
Power Input One of the six types of power supplies listed in Table 1-1 may be optionally
selected to provide internal relay operating power.
Table 1-1. Power Supply Options
Frequency Sensing Input Input sensing circuits are nominally rated 120 Vac at the selected
frequency. Relay trip points may be manually set for a single-phase
underfrequency trip point from 45 to 50 hertz for the 50 hertz styles, or 55
to 60 hertz for the 60 hertz styles. Both styles are adjustable in 0.05 hertz
increments.
Sensing Burden Burden of the frequency sensing input is 2 VA for 50 hertz styles, and 1 VA
for 60 hertz styles.
Target Indicators Function targets may be specified as either internally operated, or current
operatedbyaminimumof0.2ampere throughtheoutputtripcircuit. When
current operated, the output circuit must be limited to 30 amperes for 0.2
seconds,7 amperes for2 minutes,and 3amperescontinuously. Internally
operated targets must be specified if the breaker control (trip) circuit is ac
powered.
Reset Time Reset is automatic and instantaneous when frequency increases above
selected pickup setting. (Target must be manually reset.)
Pickup Setting Pickup setting is adjusted in Hertz-below-nominal-frequency in 0.05 hertz
steps, using three front panel thumbwheel switches.
Pickup Accuracy The relay will pickup and check timing within 0.030 hertz of the trip point in
a 60 hertz system, and within 0.035 hertz in a 50 hertz system.
Table of contents
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