Basler BE1-50 User manual

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BE1-50 Introduction i
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 operation and installation of BE1-50
Instantaneous Overcurrent Relays. To accomplish this, the following is provided.
Specifications
Functional characteristics
Installation
Operational Tests
Mounting Information

ii BE1-50 Introduction
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.
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.
First Printing: January 1986
Printed in USA
© 1998, Basler Electric Co., Highland, IL 62249
November 1998
BASLER ELECTRIC
ROUTE 143, BOX 269
HIGHLAND, IL 62249 USA
http://www.basler.com, [email protected]
PHONE [phone] FAX [phone]

BE1-50 Introduction iii
CONTENTS
SECTION 1 GENERAL INFORMATION ................................. 1-1
Application ......................................................... 1-1
General ........................................................ 1-1
Ground Fault Detection ............................................ 1-1
Phase Fault Detection ............................................. 1-1
Combination With Other Protective Devices ............................ 1-2
Model and Style Number Description ..................................... 1-2
Style Number Identification Chart ........................................ 1-3
Specifications ....................................................... 1-3
SECTION 2 HUMAN-MACHINE INTERFACE ............................. 2-1
Controls and Indicators ................................................ 2-1
General ........................................................ 2-1
SECTION 3 FUNCTIONAL DESCRIPTION ............................... 3-1
General ............................................................ 3-1
Functional Description ................................................ 3-1
Step-Down Transformer ............................................ 3-1
Full-Wave Rectifiers ............................................... 3-1
Response Characteristics .......................................... 3-2
Pickup Settings .................................................. 3-2
Pickup Comparators ............................................... 3-2
Pulse Stretchers .................................................. 3-2
Outputs ........................................................ 3-2
Targets ......................................................... 3-2
Power Supply .................................................... 3-2
Power Supply Status Outputs ....................................... 3-3
SECTION 4 INSTALLATION .......................................... 4-1
General ............................................................ 4-1
Relay Operating Precautions ........................................... 4-1
Dielectric Test ....................................................... 4-1
Mounting ........................................................... 4-1
Connections ........................................................ 4-8
SECTION 5 TESTING ................................................ 5-1
General ............................................................ 5-1
Relay Operating Precautions ........................................... 5-1
Operational Test Procedure ............................................ 5-1
SECTION 6 MAINTENANCE .......................................... 6-1
General ............................................................ 6-1
In-House Repair ..................................................... 6-1
Storage ............................................................ 6-1
Test Plug .......................................................... 6-1

iv BE1-50 Introduction
CONTENTS-Continued
SECTION 7 MANUAL CHANGE INFORMATION ..........................7-1
Changes ........................................................... 7-1

BE1-50 General Information 1-1
SECTION 1 • GENERAL INFORMATION
APPLICATION
General
Instantaneous overcurrent relays provide phase and ground fault protection for distribution circuits,
generators, motors, transformers, and other major components of power systems. BE1-50 Instantaneous
Overcurrent Relays have a wide range of pickup settings and input configurations to accommodate
protection requirements for power systems. BE1-50 relays are available in single- or multi-phase for power
units. Some applications are illustrated in Figure 1-1.
Figure 1-1. Typical BE1-50 Applications
Ground Fault Detection
BE1-50 relays can be applied to monitor zero sequence currents that are indicative of ground faults. The
most sensitive method of ground fault protection utilizes a single current transformer through which all the
conductorsarepassed(Figure 1-1b). Anothermethod usesthe residualconnection ofthe three-phaseCTs
(Figure 1-1d) with the relay set higher than the normal system unbalance. The most direct method is to
place a CT in the neutral of a grounded wye connection for equipment such as power transformers or
generators (Figure 1-1c).
Phase Fault Detection
BE1-50relays canbe usedin twoways todetect phasefaults. The first methodisto place aninstantaneous
overcurrent element in each phasewith the setting higher than expected load current for any power system

1-2 BE1-50 General Information
element(Figure1-1a,d,e,f). Thesecondmethodiscalledself-balancingdifferentialprotection(Figure 1-2).
In this application, the two leads of each phase of the protected motor or generator are passed through the
window of the same associated phase current transformer so that the resulting secondary current is zero
under normal operating conditions.
Combination With Other Protective Devices
Because BE1-50 relays can provide complete phase and ground fault protection in one unit (and with
independent settings for phase and ground), they are often used to supervise other relay functions. In
distance protection, BE1-50 relays can be used to prevent misoperation for light loading conditions by
requiring a minimum current level before enabling the distance relay. As a fault detector, they are
particularly effective because of their sensitivity, speed, and drop-out ratio.
Figure 1-2. Self-Balancing Differential Protection
MODEL AND STYLE NUMBER DESCRIPTION
BE1-50Instantaneous OvercurrentRelayselectrical characteristics andoperational features are definedby
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 the style number against
the requisition and the packing list to ensure that they agree.
Style number identification chart (Figure 1-3) defines the electrical characteristics and operational features
included in BE1-50 relays. For example, if the style number were J6J A1P J1E1F, the device would have
the following:
(J) - 3-phase-and-neutral sensing
(6) - Phase sensing input range of 4.0 to 32 amperes.
(J) - Four normally open (N.O.) output relays.
(A1) - Instantaneous timing.
(P) - Operating power derived from 125 Vdc or 100/120 Vac.
(J) - Four internally operated targets.
(1) - Push-to-energize outputs (pushbuttons).
(E) - Neutral sensing range of 0.25 to 2.0 amperes.
(1) - N.O. auxiliary output relay.
(F) - Semi-flush mounting.

BE1-50 General Information 1-3
Figure 1-3. Style Number Identification Chart
SPECIFICATIONS
Current Sensing Sensing inputs are nominally rated at 50/60 Hz and have a frequency
range of 40 to 70 Hz. Current ratings and sensing burdens depend on the
sensing range and power supply type (defined by the style number), and
are shown in Table 1-1.
Pickup Range Continuously adjustable over the range defined by the style number with
independent ranges and adjustments for each phase and neutral pickup.
Pickup Accuracy ±2% or ±40 mA of pickup setting, whichever is greater.
Dropout Within 2% of pickup.
Timing 1.5 cycles or less from onset of overcurrent condition. (30 milliseconds at
50 Hz, 25 milliseconds at 60 Hz)
Power Supply Power supply Types F, G, and H derive operating power from the sensing
inputs at a maximum burden of 5 VA per phase at pickup. Externally
powered power supply ratings are shown in Table 1-2.

1-4 BE1-50 General Information
I
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Kt
Table 1-1. Current Ratings and Sensing Burdens
Power
Supply
Sensing Range
Designation Actual
Sensing
Range
Maximum Rating
50 or 60 Hz
For
Phase For Neutral Current Burden
Per Input
K* 1 Second Continuous
1 D 0.25 - 0.5A 144 12.0A 0.75A 8.5VA
2 E 0.5 - 1.0A 144 12.0A 1.5A 8.5VA
F, G 3 F 1.0 - 2.0A 625 25.0A 3A 8.5VA
or H 4 G 2.0 - 4.0A 2500 50.0A 6A 8.5VA
5 H 4.0 - 8.0A 10000 100 A 12A 8.5VA
6 J 8.0 - 16.0A 40000 200 A 20A 9.5VA
7 K 16.0 - 32.0A 90000 300 A 20A 14.0VA
O, P, 2 E 0.25 - 2.0A 10000 100 A 5A 0.2VA
R, S 4 G 1.0 - 8.0A 90000 300 A 10A 0.6VA
or T 6 J 4.0 - 32.0A 90000 300 A 20A 4.8VA
* Ratings other than continuous may be calculated using the equation:
where:
K = the indicated value
t = the time in seconds
I = maximum current
Table 1-2. Power Supply Burden
Type Nominal Input Voltage Input Voltage Range Burden at Nominal
O (Mid Range) 48 Vdc 24 to 150 Vdc 4.0 W
P (Mid Range) 125 Vdc
120 Vac 24 to 150 Vdc 90 to 132 Vac 4.0 W 10.0 VA
R (Low Range) 24 Vdc 12† to 32 Vdc 4.0 W
S (Mid Range) 48 Vdc
125 Vdc 24 to 150 Vdc 24 to 150 Vdc 4.0 W 4.0 W
T (High Range) 250 Vdc
240 Vac 62 to 280 Vdc 90 to 270 Vac 6.0 W 14.0 VA
†Type R power supply initially requires 14 Vdc to begin operating. Once operating, the voltage
may be reduced to 12 Vdc and operation will continue.
Output Circuits Output contacts are rated as follows:
Resistive:
120/240 Vac Make 30 A for 0.2 seconds, carry 7 A continuously, and break 7 A.
250 Vdc Make 30 A for 0.2 seconds, carry 7 A continuously, and break 0.3 A.
Inductive:
120/240 Vac, Make 30 A for 0.2 seconds, carry 7 A continuously, and break
125/250 Vdc 0.3 A. (L/R = 0.04).

BE1-50 General Information 1-5
Targets Function targets may be specified as either internally operated, or current
operated by a minimum of 0.2 A through the output trip circuit. When cur-
rent operated, the output circuit must be limited to 30 A for 0.2 seconds, 7
A for 2 minutes, and 3 A continuously.
RadioFrequency Maintainsproperoperationwhentestedforinterferenceinaccordance with
Interference (RFI) IECC C37.90-1989,
Trial-Use Standard Withstand Capability of Relay
Systems to Radiated Electromagnetic Interference from Transceivers.
Fast Transient Qualified to ANSI/IEEE C37.90.1-1989.
Isolation In accordance with ANSI/IEEE C37.90-1989 one minute dielectric (high
potential) test as follows:,
All circuits to ground: 2121 Vdc.
Input to output circuits: 1500 Vac or 2121 Vdc.
Shock In standard tests, the relay has withstood 15 g in each of three mutually
perpendicular planes without structural damage or degradation of perfor-
mance.
Vibration: In standard tests, the relay has withstood 2 g in each of three mutually per-
pendicular planes, swept over the range of 10 to 500 Hz for a total of six
sweeps,15minuteseachsweep,withoutstructuraldamageordegradation
of performance.
SurgeWithstandCapability QualifiedtoANSI/IEEEC37.90.1-1989StandardSurge Withstand Capabil-
ity (SWC) Tests for Protective Relays and Relay Systems.
UL Recognition UL recognized per Standard 508, UL File No. E97033.
Operating Temperature -40C (-40F) to +70C (+158F).
Storage Temperature -65C (-85F) to +100C (+212F).
Weight 17.5 pounds (7.76 kg) minimum.
Case Size S1.

BE1-50 Human-Machine Interface 2-1
SECTION 2 • HUMAN-MACHINE INTERFACE
CONTROLS AND INDICATORS
GENERAL
Table 2-1 lists and briefly describes the operator controls and indicators of the BE1-50 Instantaneous
Overcurrent Relay. Reference the call-out letters to Figure 2-1.
Table 2-1. Controls and Indicators
Letter Control or Indicator Function or Indicator
APHASE CURRENT ADJUST Multiturn potentiometer (no stops) sets the pickup
point for all phase overcurrent elements within the
relay. Continuously adjustable over the range
defined by the style number.
BNEUTRAL CURRENT
ADJUST Multiturn potentiometer (no stops) sets the pickup
point for all neutral overcurrent elements within
the relay. Continuously adjustable over the range
defined by the style number.
CPOWER Indicator LED illuminates to indicate that the relay power
supply is functioning.
D Target Reset Lever Linkage extends through bottom of front cover to
reset the target indicators.
E Target Indicators (Optional) Magnetically latching indicators are tripped to red
to indicate that the corresponding output relay
either has been energized (internally operated) or
that a minimum of 0.2 amperes has flowed
through the contacts (current operated).
F Push-to-Energize (Optional)
(Only available with power
supply types O, P, R, S, T)
Momentary pushbuttons are accessible through
the front panel and used to test output relays and
verify system wiring.

2-2 BE1-50 Human-Machine Interface
Figure 2-1. Location of Controls and Indicators

BE1-50 Functional Description 3-1
SECTION 3 • FUNCTIONAL DESCRIPTION
GENERAL
BE1-50 Instantaneous Overcurrent Relays are static devices that respond to the current magnitude of the
monitored circuit.
FUNCTIONAL DESCRIPTION
Figure 3-1 is a functional block diagram of the BE1-50 Instantaneous Overcurrent Relay.
Figure 3-1. Functional Block Diagram
Step-Down Transformer
Monitored system currents are applied to the primaries of internal current transformers and stepped down
to internal circuit levels. The internal current transformers provide 1500 V isolation for the twelve volt logic
circuits of the relay.
Full-Wave Rectifiers
Outputsfrom eachstep-down transformerarefull-wave rectified and applied to resistor networks to develop
voltages that represent the magnitude of the monitored system currents.

3-2 BE1-50 Functional Description
Res
p
onse Characteristics
Input current signals are rectified and passed through a low pass filter. Filtering smooths out current spikes
and provides a degree of security against operation on short term transients.
Filteringalsosmooths out theharmoniccomponenteffectsoncurrentsignals. Harmoniccomponent effects
are reduced approximately by 1/
n where n is the order of the harmonic. For example, the third harmonic
effect is reduced by filtering to 1/3rd. of what it would be without filtering. With filtering, the response
characteristics are similar to those of electromechanical relays.
Picku
p
Settin
g
s
A front panel multiple-turn potentiometer controls the pickup setting for all phases. The potentiometer
establishesthereferencevoltagerepresentativeofthesystemcurrentwhich will cause therelaytorespond.
On relay styles monitoring neutral current, an independent potentiometer is provided to establish the pickup
level for neutral.
Picku
p
Com
p
arators
The magnitude of each monitored current is compared with the appropriate pickup setting. When a pickup
setting is exceeded, a pulse stretcher for that phase (or neutral) is activated.
Pulse Stretchers
Because the sensed currents are full-wave rectified and minimally filtered to retain high speed operation,
the pulse output from the comparators must be extended.
Out
p
uts
Defined by the style number, individual output relays may be provided for each monitored phase (and
neutral). Oneoutputrelay may serveforallmonitoredphases(andneutral). Inaddition, oneauxiliaryoutput
relay may be provided that serves for all monitored phases (and neutral).
Tar
g
ets
Magnetically latching target indicators may be provided for each monitored phase and neutral. These
targets are actuated upon an overcurrent condition and may be either internally operated or current operat-
ed. Current operated targets require a minimum of 0.2 A flowing through their corresponding output relay's
contacts. Target indicators may be reset with the manual reset lever.
Power Su
pp
l
y
Basler Electric enhanced the power supply design for unit case relays. This new design created three, wide
rangepowersuppliesthatreplacethe fivepreviouspowersupplies. Stylenumberidentifiersfor thesepower
supplies have not been changed so that customers may order the same style numbers that they ordered
previously. The first newly designed power supplies were installed in unit case relays with EIA date codes
9638 (third week of September 1996). Relays with a serial number that consists of one alpha character
followed by eight numerical characters also have the new wide range power supplies. A benefit of this new
design increases the power supply operating ranges such that the 48/125 volt selector is no longer
necessary. Specific voltage ranges for the three new power supplies and a cross reference to the style
number identifiers are shown in the following table.

BE1-50 Functional Description 3-3
Table 3-1. Wide Range Power Supply Voltage Ranges
Power Supply Style Chart Identifiers Nominal Voltage Voltage Range
Low Range R 24 Vdc 12† to 32 Vdc
Mid Range O, P, S 48, 125 Vdc,
120 Vac 24 to 150 Vdc, 90 to 132 Vac
High Range T 125, 250 Vdc,
120, 240 Vac 62 to 280 Vdc, 90 to 270 Vac
† 14 Vdc is required to start the power supply.
Relay operating power is developed by the wide range, isolated, low burden, flyback switching, solid state
power supply. Nominal ±12 Vdc is delivered to the relay internal circuitry. Input (source voltage) for the
power supply is not polarity sensitive. A red LED turns ON to indicate that the power supply is functioning
properly.
Power Su
pp
l
y
Status Out
p
ut
A normally closed output relay may be provided, whose contact remains open when energized by the
presence of nominal voltage at the output of the power supply. If the power supply voltage fails or falls
below requirements, the power supply status output relay will deenergize, closing its contact. If the power
supply status output is provided, then auxiliary output contacts are not available.

BE1-50 Installation 4-1
SECTION 4 • INSTALLATION
GENERAL
When not shipped as part of a control or switchgear panel, relays are shipped in sturdy cartons to prevent
damage during transit. Immediately upon receipt of a relay, check the model and style number against the
requisition and packing list to see that they agree. Visually inspect the relay for damage that may have
occurredduring shipment. Ifthereis evidence ofdamage, immediately file aclaim with thecarrier andnotify
the Regional Sales Office, or contact the Sales Representative at Basler Electric, Highland, Illinois.
In the event the relay is not to be installed immediately, store the relay in its original shipping carton in a
moisture and dust free environment. When relay is to be placed in service, it is recommended that the
operational test procedure (Section 5) be performed prior to installation.
RELAY OPERATING PRECAUTIONS
Before installation or operation of the relay, note the following precautions:
1. A minimum of 0.2 A in the output circuit is required to ensure operation of current operated targets.
2. The relay is a solid-state device. If a wiring insulation test is required, remove the connecting plugs
and withdraw the cradle from its case.
3. Whentheconnecting plugs areremoved the relay isdisconnectedfromtheoperatingcircuit and will
not provide system protection. Always be sure that external operating (monitored) conditions are
stable before removing a relay for inspection, test, or service.
4. Be sure the relay case is hard wired to earth ground using the ground terminal on the rear of the
unit. It is recommended to use a separate ground lead to the ground bus for each relay.
DIELECTRIC TEST
In accordance with ANSI/IEEE C37.90-1989 one minute dielectric (high potential) test as follows:
All circuits to
g
round: 2121 Vdc.
Input to output circuits: 1500 Vac or 2121 Vdc.
MOUNTING
Because the relay is of solid state design, it does not have to be mounted vertically. Any convenient
mounting angle may be chosen. Relay outline dimensions and panel drilling diagrams are supplied in
Figures 4-1 through 4-9.

4-2 BE1-50 Installation
Figure 4-1. S1 Case, Panel Drilling Diagram, Semi-Flush Mounting
Figure 4-2. S1 Case, Outline Dimensions, Front View

BE1-50 Installation 4-3
Figure 4-3. S1 Case, Single-Ended, Semi-Flush Mounting, Outline Dimensions, Side View
Figure 4-4. S1 Case, Single-Ended, Projection Mounting, Outline Dimensions, Side View

4-4 BE1-50 Installation
Figure 4-5. S1 Case, Double-Ended, Semi-Flush Mounting, Outline Dimensions, Side View
Figure 4-6. S1 Case, Double-Ended, Projection Mounting, Outline Dimensions, Side View

BE1-50 Installation 4-5
Figure 4-7. S1 Case, Single-Ended, Panel Drilling Diagram, Rear View