Basler BE1-51 User manual

INSTRUCTION MANUAL
FOR
TIME OVERCURRENT RELAY
BE1-51
Publication Number:
Revision: C 01/98

BE1-51 - 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 BE1-51
Time Overcurrent Relays. To accomplish this, the following is provided.
Specifications
Functional characteristics
Operational Tests
Mounting Information

ii BE1-51 -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.
First Printing: July 1992
Printed in USA
© 1997, 1998, Basler Electric Co., Highland, IL 62249
January 1998
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
ROUTE 143, BOX 269
HIGHLAND, IL 62249 USA
http://www.basler.com, [email protected]
PHONE [phone] FAX [phone]

BE1-51 - Introduction iii
CONTENTS
Section 1 GENERAL INFORMATION 1-1
Description ............................................. 1-1
Standard Features ....................................... 1-1
Time Overcurrent Functions ............................. 1-1
Non-Integrating Timing Function ......................... 1-2
Integrating Timing Function ............................. 1-2
Built-in Test ......................................... 1-2
Options ............................................... 1-2
Timing ............................................. 1-2
Neutral Defeat ....................................... 1-3
Sensing Input Type ................................... 1-3
Sensing Input Range .................................. 1-3
Power Supply ....................................... 1-3
Targets ............................................ 1-3
Outputs ............................................ 1-3
Instantaneous Outputs ................................. 1-3
Packaging .......................................... 1-4
Model and Style Number Description ......................... 1-4
Specifications ........................................... 1-5
Time Overcurrent Characteristic Curves ....................... 1-8
Section 2 HUMAN MACHINE INTERFACE (Controls And Indicators) 2-1
Description ............................................. 2-1
Table 2-1. Controls and Indicators ........................... 2-1
Figure 2-1. Location Of Controls And Indicators ................ 2-2
Table 2-2. Sensing Input Ranges ........................... 2-4
Table 2-3. Timing Curve Selection Table ...................... 2-5
Table 2-4. Target Installation Configurations ................... 2-5
Section 3 FUNCTIONAL DESCRIPTION 3-1
General ............................................... 3-1
Block Diagram Analysis ................................... 3-1
Power Supply ....................................... 3-1
Current Sensing ...................................... 3-1
Figure 3-1. Functional Block Diagram ..................... 3-2
Tap Select and Tap Cal ................................ 3-3
Neutral Defeat ....................................... 3-3
Multiplexor .......................................... 3-3
Analog-To-Digital Converter and Level Detector .............. 3-3
Time Trip Comparator and Scaler ........................ 3-3
Microprocessor ...................................... 3-3
Instantaneous Overcurrent .............................. 3-3
Timed and Instantaneous Outputs ........................ 3-4
Auxiliary Outputs ..................................... 3-4
Push-to-Energize Pushbuttons ........................... 3-4
Power Supply Status Output ............................ 3-4
Target Indicator Circuits ................................ 3-4
Internally Operated Targets ............................. 3-4
Current Operated Targets .............................. 3-4

iv BE1-51 -Introduction
CONTENTS - Continued
Section 4 INSTALLATION 4-1
General ............................................... 4-1
Relay Operating Precautions ............................... 4-1
Dielectric Test .......................................... 4-1
Mounting .............................................. 4-1
Connections ............................................ 4-1
Figure 4-1. Typical External Connections, DC Powered ........... 4-2
Figure 4-2. Typical Sensing Connections, Sensing Input G or K ..... 4-3
Figure 4-3. Typical Sensing Connections, Sensing Input I or X ..... 4-3
Figure 4-4. Typical Sensing Connections, Sensing Input H or V ..... 4-4
Figure 4-5. Typical Internal Diagram, Sensing Input K With PSS .... 4-5
Figure 4-6. Typical Internal Diagram, Sensing Input I or X With PSS . 4-6
Figure 4-7. Typical Internal Diagram, Sensing Input G With PSS .... 4-7
Figure 4-8. Typical Internal Diagram, Sensing Input H or V With PSS 4-8
Figure 4-9. Panel Drilling Diagram, Semi-flush Mounting .......... 4-9
Figure 4-10. Outline Dimensions, Semi-flush Mounting ........... 4-9
Figure 4-11. Panel Drilling diagram, Projection Mounting .......... 4-10
Figure 4-12. Outline Dimensions, Projection Mounting ............ 4-10
Section 5 TESTS AND ADJUSTMENTS 5-1
General ............................................... 5-1
Required Test Equipment .................................. 5-1
Operational Test ......................................... 5-1
Preliminary Instructions ................................ 5-1
Test Setup For Sensing Input Type K ...................... 5-2
Test Setup For Sensing Input Type G ..................... 5-3
Test Setup For Sensing Input Type H or V .................. 5-3
Test Setup For Sensing Input Type I or X ................... 5-4
Time Overcurrent Pickup Test ........................... 5-4
Neutral Defeat Test ................................... 5-6
Timed Output Test .................................... 5-6
Instantaneous Overcurrent Pickup Test .................... 5-8
Adjustment Of Controls for Relay Operation .................... 5-10
Tap and Tap (Neutral) Selector Setting .................... 5-10
Time Overcurrent Curve Selection (Timing Type Z1, Z2, and Z3) . 5-11
Time Delay Selection .................................. 5-12
Neutral Time Delay Selection ............................ 5-12
Inst 1 Control Setting .................................. 5-13
Inst 2 Control Setting .................................. 5-14
Section 6 MAINTENANCE 6-1
General ............................................... 6-1
In-House Repair ......................................... 6-1
Storage ............................................... 6-1
Test Plug .............................................. 6-1
Section 7 MANUAL CHANGE INFORMATION 7-1

BE1-51 - General Information 1-1
SECTION 1 • GENERAL INFORMATION
DESCRIPTION
BE1-51 Time Overcurrent Relays are microprocessor based devices that monitor the magnitude of single-
phase, two-phase-and-neutral, or three-phase-and-neutral ac current to provide accurate time overcurrent
and instantaneous overcurrent protection for 50 hertz or 60 hertz power systems.
STANDARD FEATURES
Time Overcurrent Functions
Time overcurrent elements pick up over a range of 0.1 to 0.8 amperes, 0.3 to 2.4 amperes, 0.5 to 4.0
amperes, 1.5 to 12.0 amperes, 0.1 to 2.4 amperes, or 0.5 to 12.0 amperes and provide an adjustable time
delay that is proportional to the overcurrent. Time delay is initiated when the sensed current exceeds the
pickup point. When the current drops below the pickup point, the timing circuit is reset immediately. At reset,
the output contacts, if operated, are restored to normal.
Adjustment of the overcurrent pickup point is provided by controls on the relay front panel. Time delay is a
function of the characteristic curve that has been selected. Time delay is settable from 00 to 99 on the front
panel Time DIAL thumbwheel switch. Curve type is either selected as an option or, in some models, is
switch selectable.
Sixty-nine characteristic curves and three timing options are available. They are:
Characteristic curves:
Seven inverse time
Nine I2T
Seven inverse time with extended timing range
Nine I2T with extended timing range
Five British Standard 142 (E curves)
Seven integrating inverse time
Nine integrating I2T
Seven integrating inverse time with extended timing range
Nine integrating I2T with extended timing range
Timing option Z1 (switch selectable - 16 position) B & C curves:
Seven inverse time
Nine I2T
Timing option Z1 with option 2-D or 2-E, (switch selectable - 16 position) B and C curves:
Seven inverse time with extended timing range
Nine I2T with extended timing range
Timing option Z2 (switch selectable - 16 position) B and E (British Standard 142) curves:
Seven inverse time
One I2T
Five British Standard (BS) 142 (E curves)

1-2 BE1-51 - General Information
Timing option Z2 with option 2-D or 2-E, (switch selectable - 16 position) B and E (BS142) curves:
Seven inverse time with extended timing range
One I2T with extended timing range
Five British Standard 142 (E curves)
Timing option Z3 (switch selectable - 16 position) integrating B & C curves:
Seven integrating inverse time
Nine integrating I2T
Timing option Z3 with option 2-D or 2-E, (switch selectable - 16 position) integrating extended B & C
curves:
Seven integrating inverse time with extended timing range
Nine integrating I2T with extended timing range
Characteristic curves are shown by the graphs in Figures 1-2 through 1-70. Note that each graph (i.e.
function) consists of a set of representative curves. Each curve (as well as any between-curve interpolation)
is selectable by the front panel TIME DIAL, using a two-digit designation from 00 to 99. Because of space
limitations, each graph shows only 14 of the 100 possible selections.
Non-Integrating Timing
Timing options Z1 and Z2 and the characteristic curves available with those options use non-integrating
timing. Non-integrating timing is accomplished by timing at a gate that is not solely dependent on the
magnitude of the applied multiple of pickup current. The time-out value is calculated based on the type of
time curve characteristic selected, time dial setting, and the magnitude of the applied multiple of pickup
current. The time-out value is continuously updated during the timing cycle. When pickup is exceeded, a
timer is initiated. When the timer elapsed time exceeds the calculated time-out value, a time trip output signal
is generated.
This type of non-integrating time delay characteristic exhibits a dynamic characteristic that is immediately
responsive to changes of the applied multiple of pickup current.
Integrating Timing
Timing option Z3 and the characteristic curves available for that option uses integrating timing. Integrating
timing is accomplished by summing time increments that are based on the magnitude of the applied multiple
of pickup current, the time curve characteristic selected, and the time dial value. These time increments are
summed until a predetermined value is exceeded, then a time trip output signal is generated.
This type of integrating time delay characteristic simulates the operating characteristics of an
electromechanical overcurrent relay.
Built-In Test
A built-in test (BIT) switch mounted on the Logic Board provides diagnostic troubleshooting and calibration.
OPTIONS
Timing
An extended timing option multiplies by approximately 5.7, the standard time delays. The resulting curves
are shown following the standard curves—e.g., Figure 1-2 is timing type B1 and Figure 1-3 is the timing type
B1 with extended timing range.
When timing option Z1, Z2, or Z3 is specified, a printed circuit board mounted selector switch allows a choice
of up to sixteen different time overcurrent functions. Timing option Z1 or Z3 may be further specified as stan-
dard or extended time, depending upon option 2 selection.

BE1-51 - General Information 1-3
Neutral Defeat
When neutral defeat is specified, a front panel switch allows neutral current sensing to be disabled. This
function permits the user to energize desired circuits and not trip because of imbalanced current in the neutral
circuit. After the circuits are balanced, the neutral defeat function can be switched off and neutral current
sensing protection is provided.
Sensing Input Type
When single-phase, two-phase-and-neutral, three-phase, or three-phase-and-neutral sensing has been
specified, the front panel TAP selector and the front panel TAP CAL control set the pickup point for all
phases. An independent front panel TAP (NEUTRAL) selector and front panel CAL (NEUTRAL) control set
the neutral pickup point. Also, for three-phase-and-neutral sensing units, one of the seven sensing input
range combinations must be specified.
Sensing Input Range
For three-phase-and-neutral sensing units, input ranges are:
0.5 to 4.0 amperes (phase and neutral)
1.5 to 12 amperes (phase) and 0.5 to 4.0 amperes (neutral)
0.5 to 4 amperes (phase) and 1.5 to 12 amperes (neutral)
1.5 to 12 amperes (phase and neutral)
0.1 to 0.8 amperes (phase and neutral)
0.3 to 2.4 amperes (phase) and 0.1 to 0.8 amperes (neutral)
0.3 to 2.4 amperes (phase and neutral)
For all other units, two ranges are available. They are 0.5 to 12 amperes and 0.1 to 2.4 amperes.
Power Supply
Five power supply options are available. They are:
24 Vdc
48 Vdc
125 Vdc and 100/125 Vac
48 Vdc or 125 Vdc and 100/125 Vac
250 Vdc and 230 Vac
Targets
Single-phase relays have two function targets that indicate when the time delay or instantaneous elements(s)
have operated. On multiple phase relays, additional targets indicate which phase or neutral elements(s)
operated.
Function targets may be specified as either internally operated or current operated by a minimum of 0.2
amperes through the output trip circuit. When current operated, the output circuit must be limited to 30
amperes for 0.2 seconds, 7 amperes for 2 minutes, and 3 amperes continuously. Element targets are
internally operated.
Outputs
Optional normally opened, normally closed, or SPDT auxiliary output contacts may be selected. Contacts
actuate when the output relay is energized. Internally operated front panel mounted targets, and front panel
targets operated by the dc current in the output circuit are available for the time overcurrent and
instantaneous overcurrent functions. Optional front panel mounted PUSH-TO-ENERGIZE-OUTPUT
pushbuttons allow direct actuation of each output relay for external circuit testing.
Instantaneous Outputs
One or two instantaneous overcurrent outputs are optionally available. Each is adjustable up to 40 times the

1-4 BE1-51 - General Information
time overcurrent pickup point. When the sensed current exceeds the instantaneous overcurrent pickup point,
an output relay is energized. An independent front panel control (INST 1 or INST 2) adjusts the pickup point
for each optional output. If more than one phase is applied to the relay, the instantaneous pickup point will
be the same for all phases. If neutral current is sensed, a front panel INST 1 (NEUTRAL) provides
adjustment of the neutral pickup point. Instantaneous overcurrent elements are not voltage controlled.
Packaging
Each relay is mounted in a drawout cradle and enclosed in a standard utility style case with either semi-flush
or projection mounting (depending upon case style selected). Circuit components are accessed by removing
the individual printed circuit boards from the relay cradle. Use an extender card (Basler Electric part number:
9 1655 00 100) to test and troubleshoot the relay. An available test plug (Basler Electric part number: 10095
or G.E. part number 12XLA12A1) allows the relay to be tested in place without disturbing external control
circuit wiring.
MODEL AND STYLE NUMBER DESCRIPTION
Electrical characteristics and operational features included in a particular style of the BE1-51 Relay 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 the style number
against the requisition and the packing list to ensure that they agree.
Style Number Identification Chart (Figure 1-1) illustrates the manner in which the relay style number is
determined. For example, if the style number were H3E Z1P B1C1F, the device would have the following
characteristics:
H-3-Phase-and-neutral sensing.
3-Sensing input range of 1.5 to 12.0 for phase, 0.5 to 4.0 ampere for neutral.
E-N.O. outputs.
Z1 - Switch selectable time curves.
P-Operating power derived from 125 Vdc or 100/120 Vac.
B-Current operated targets.
2-2 instantaneous elements.
C-Push-to-energize outputs.
1-N.O. auxiliary timed output relay.
F-Semi-flush mounting.

BE1-51 - General Information 1-5
I
(50 X tap value or 500 A , whichever is less )
T
Figure 1-1. Style Number Identification Chart
SPECIFICATIONS
BE1-51 Time Overcurrent Relays electrical and physical specifications are as follows:
Sensing Input Burden Less than 0.1 ohms per phase or neutral.
Sensing Input Rating The maximum continuous rating is 20 A, 1 second current rating is 50X
(times) the maximum tap current selected, or 500 A, whichever is less. For
ratings other than those specified by the time curves, rating is a calculated
as follows:
Where:
I=MaximumCurrent
T=TimeofCurrentFlowinSeconds

1-6 BE1-51 - General Information
Graph 1-1. Instantaneous Response Time
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 and carry 30 A for 0.2 seconds, carry 7 A continuously, and break
0.3 A.
500 Vdc Make and carry 15 A for 0.2 seconds, carry 7 A continuously, and break
0.1 A.
Inductive:
120/240 Vac, Make and carry 30 A for 0.2 seconds, carry 7 A continuously,
125/250 Vdc and break 0.3 A. (L/R = 0.04).
Target Indicators 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.
Time Overcurrent Pickup Continuously adjustable over the current sensing input ranges specified
Selection Range in the Style Chart (Figure 1-1).
Time Overcurrent Measuring ±5% of the front panel TAP selector setting with the TAP CAL control fully
Accuracy CW. Repeatability is within ±2% of the setting.
Time Overcurrent Dropout Better than 95% of pickup level.
Ratio
Instantaneous Overcurrent Continuously adjustable over the range of 1 to 40 times the time
Pickup Range overcurrent pickup setting.
Instantaneous Overcurrent ±5% of the front panel TAP selector setting with the TAP CAL control fully
Measuring Accuracy CW. Repeatability is within ±2% of the setting.
Instantaneous Overcurrent Better than 98% of pickup level.
Dropout Ratio
Instantaneous Response Graph 1-1 shows the typical response for the instantaneous pickup
element.

BE1-51 - General Information 1-7
Time Delay Accuracy ±5% of the characteristic curve (Figures 1-2 through 1-38) for any
combination of the front panel TIME DIAL setting and the front panel
TAP/TAP CAL overcurrent pickup setting.
Repeatability is within ±2% of setting at 25 C.
Power Supply Input power may be obtained from a variety of ac or dc external power
sources. Available power supply options are as shown in Table 1-3.
Table 1-3. Power Supply Specifications.
Type
Nominal Input
Voltage
Input Voltage
Range
Burden at
Nominal
O (Mid Range) 48 Vdc 24 to 150 Vdc 4.9 W
P (Mid Range) 125 Vdc
120 Vac
24 to 150 Vdc
90 to 132 Vac
5.1 W
12.1 VA
†R (Low Range) 24 Vdc 12 to 32 Vdc 5.2 W
S (Mid Range) 48 Vdc
125 Vdc
24 to 150 Vdc
24 to 150 Vdc
4.9 W
5.1 W
T (High Range) 250 Vdc
230 Vac
68 to 280 Vdc
90 to 270 Vac
5.5 W
14.0 VA
NOTES:
All references are at 50/60 hertz.
†TypeRPowerSupplymayrequire14Vdctobeginoperation.Onceoperating,thevoltagemaybe
reduced to 12 Vdc.
Radio Frequency Field Tested using a five watt, hand-held transceiver operating at ran-
Interference (RFI) dom frequencies centered around 144 MHZ and 440 MHZ, with the
antenna located six inches from the relay in both horizontal and vertical
planes.
Isolation In accordance with IEC 255-5 and ANSI/IEEE C37.90, one-minute
dielectric (high potential) tests as follows:
All circuits to ground: 2121 Vdc.
Input to output circuits: 1500 Vac or 2121 Vdc
Surge Withstand Capability Qualified to ANSI/IEEE C37.90.1-1989
Standard surge Withstand
Capability (SWC) Tests for Protective Relays and Relay Systems.
UL Recognized UL Recognized per Standard 508, UL File No. E97033. Note: Relay is not
UL Recognized for output contact voltages greater than 250 volts and
input power supply voltages greater than 150 volts.
Operating Temperature -40 C (-40 F) to +70 C (+158 F).
Storage Temperature -65 C (-85 F) to +100 C (+212 F).
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
perpendicular planes, swept over the range of 10 to 500 hertz for a total
of six sweeps, 15 minutes each sweep, without structural damage or
degradation of performance.

1-8 BE1-51 - General Information
Weight
Single-Phase: 13.0 lbs. (5.90 kg)
Two-Phase-and-Neutral: 14.0 lbs. (6.35 kg)
Three-Phase: 14.0 lbs. (6.35 kg)
Three-Phase-and-Neutral: 14.4 lbs. (6.53 kg)
Case Size S1.
TIME OVERCURRENT CHARACTERISTIC CURVES
Graphs on the following pages illustrate sample characteristic curves for all of the time overcurrent functions
individually as options, or selectable by switch (if the Z1, Z2, or Z3 timing option is specified). Z1 option can
select any of the timing types designated as B1 through B8, and C1 through C8. Z2 option can select any
of the timing types designated as B1 through B8, and the British Standard timing types: E2, E4, E5, E6, and
E7. Z3 option can select the integrating algorithm for any of the timing types designated as B1 through B8,
and C1 through C8.
Note that there are two versions of each timing type: standard and extended timing. Both types are located
on the same page. The exception to this is the British Standard curves which do not have an extended timing
version. For any given relay, either the standard or the extended range version will apply, never both.
A drawing number is provided with each characteristic curve chart. Use this number to order the full-size (11"
X 17") characteristic curve chart on transparent paper (vellum). To order any of these characteristic curve
charts, contact Customer Service Department of the Power Systems Group, Basler Electric.

BE1-51 - General Information 1-9
Figure 1-2. Timing Type B1: Short Inverse.
(Drawing No. 99-0932)
Figure 1-3. Timing Type B1E: Short Inverse
With Extended Timing Range.
(Drawing No. 99-0944)

1-10 BE1-51 - General Information
Figure 1-4. Timing Type B2: Long Inverse
(Drawing No. 99-0931)
Figure 1-5. Timing Type B2E: Long Inverse
With Extended Timing Range.
(Drawing No. 99-0946)

BE1-51 - General Information 1-11
Figure 1-6. Timing Type B3: Definite Time
(Drawing No. 99-0933)
Figure 1-7. Timing Type B3E: Definite Time
With Extended Timing Range.
(Drawing No. 99-0942)

1-12 BE1-51 - General Information
Figure 1-8. Timing Type B4:
Moderately Inverse
(Drawing No. 99-0930)
Figure 1-9. Timing Type B4E: Moderately
Inverse With Extended Timing Range.
(Drawing No. 99-0945)

BE1-51 - General Information 1-13
Figure 1-10. Timing Type B5: Inverse
(Drawing No. 99-0929) Figure 1-11. Timing Type B5E: Inverse
With Extended Timing Range
(Drawing No. 99-0943)

1-14 BE1-51 - General Information
Figure 1-12. Timing Type B6: Very Inverse
(Drawing No. 99-0928)
Figure 1-13. Timing Type B6E: Very Inverse
With Extended Timing Range.
(Drawing No. 99-0941)

BE1-51 - General Information 1-15
Figure 1-14. Timing Type B7: Extremely
Inverse
(Drawing No. 99-0927)
Figure 1-15. Timing Type B7E: Extremely
Inverse With Extended Timing Range.
(Drawing No. 99-0940)