Basler BE1-59NC User manual

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Publication: 9 2794 00 990
Revision: A 01/98

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
operationandinstallationoftheBE1-59NCNeutralOvervoltageRelay.
To accomplish this, the following is provided.
Specifications
Functional characteristics
Mounting Information
Connections
Testing
REV A
ECA 14472

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: April 1994
Printed in USA
September 1994
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 [phone] FAX [phone]

iii
CONTENTS
Section 1 GENERAL INFORMATION 1-1
General ................................................ 1-1
Application .............................................. 1-1
Capacitor Bank Switching ............................... 1-1
Protection ........................................... 1-1
Input Sensing ........................................ 1-2
Alarms And Outputs ................................... 1-3
Model and Style Number Description ......................... 1-3
Sample Style Number .................................. 1-3
Style Number Identification Chart ......................... 1-4
Specifications ........................................... 1-4
Characteristic Curves ..................................... 1-6
Section 2 CONTROLS AND INDICATORS 2-1
Section 3 FUNCTIONAL DESCRIPTION 3-1
General ................................................ 3-1
Functional Description ..................................... 3-1
Inputs .............................................. 3-1
Filters .............................................. 3-1
Overvoltage Comparator ................................ 3-2
Definite Time Delay ................................... 3-2
Inverse Time Delay .................................... 3-2
Reference voltage Circuit ............................... 3-2
Power Supply ........................................ 3-2
Power Supply Status Contacts ........................... 3-2
Target Indicator Circuits ................................ 3-2
Section 4 INSTALLATION 4-1
General ................................................ 4-1
Relay Operating Precautions ............................... 4-1
Dielectric Test ........................................... 4-1
Relay Mounting .......................................... 4-1
Connections ............................................ 4-8
Section 5 TESTING 5-1
General ................................................ 5-1
Equipment Required ...................................... 5-1
Operational Test ......................................... 5-1
E2 Timing Option ..................................... 5-1
Typical Test Setup Timing Option E2 ...................... 5-2
Typical Test Setup Timing Option D1 Or D2 ................. 5-3
D1 Timing Option ..................................... 5-4
D2 Timing Option ..................................... 5-6

iv
CONTENTS - Continued
Section 6 MAINTENANCE 6-1
General ................................................ 6-1
Storage ................................................ 6-1
Test Plug ............................................... 6-1
Section 7 MANUAL CHANGE INFORMATION 7-1

1-1
SECTION 1
GENERAL INFORMATION
GENERAL
BE1-59NC Neutral Overvoltage Relays provide sensitive protection for capacitor banks. There are three
common types of capacitor bank failures that BE1-59NC Neutral Overvoltage Relays recognize. They are:
Unit dielectric failure.
Capacitor bank insulator failure.
Blown fuses.
BE1-59NC Neutral Overvoltage Relays protect for overvoltages due to internal voltage shifts that occur as
a result of these types of failures.
APPLICATION
Capacitor banks are widely used by utilities to maintain specified system voltage. Addition of capacitive
loads at appropriate points on the system compensate for heavy inductive loading that normally tends to
reduce voltage. This adding of leading megavars to compensate for the lagging megavar component of
electric loads is frequently referred to as power factor correction. Capacitor banks must be switched in
response to actual load conditions in order to obtain maximum power factor correction benefits.
Capacitor Bank Switching
One of the common methods of maximizing capacitor bank benefits is by evaluating the bus voltage. A
bandwidth surrounding the desired bus voltage level is established. When the bus voltage falls below the
bandwidth level, the capacitor bank is switched into the circuit. When the bus voltage rises above the
bandwidth level, the capacitor bank is switched out.
Protection
Protection of capacitor banks has always been difficult. It is especially difficult to sense failures inside the
capacitor banks because of the configuration. Experience indicates that most capacitor bank faults involve
one or more insulator failures with arcing across groups and/or phase-to-phase inside the bank. In most
cases, these types of faults are not seen by the bus differential or other protection unless the arcing spills
over to the area between the fuses and the circuit switcher. A fault across an insulator usually means that
one or more groups of parallel units are shorted. This will cause a neutral shift and unbalanced phase
currents. Unbalancedphasecurrentmagnitudesaredeterminedbythenumberofseriesconnectedgroups.
For full phase-to-neutral flashover, the maximum phase current is three times normal capacitor bank load
in the faulted phase.
Onemainprotection concern isovervoltagecascading. Acapacitorbankis unique inthatcascadingofunits
may take place after a predetermined number of unit fuses haveoperated. Normally aftera fuse has blown
in any other type of equipment, the faulted apparatus is disconnected and usually does not affect any
remaining equipment that is in service. That is not so with a capacitor bank. Each fuse that blows to isolate
the faulted unit sets up an increased voltage stress on the remaining units (Figure 1-1). Sometime later, the
nextweakestunit in thatgroupfails. As each successivefuseblows,thevoltage increases anotherstepand
rapidly causes the next unit to fail. Cascading takes place and results in serious damage to the capacitor
bankandpossiblehazardstopersonnel. Whilethecapacitorbankisfailing,thestationinminimallyaffected.

BE1-59NC General Information
1-2
The voltage is nearly normal, the current flow is almost unaffected, and station relay protection is not taking
any action until the failure has developed into a phase-to-phase or phase-to-ground fault.
A solution was to develop a protective scheme for the capacitor bank with the main emphasis on preventing
overvoltage cascading. To do this, a ground fault relay or neutral shift device had to be developed that was
sensitive enough to detect blown fuses for both alarming and tripping purposes. The best place to obtain
the sensing information is between the neutral of the capacitor bank and ground. Voltage differentials
between the normal capacitor bank status and that of one blown fuse are very small. However, BE1-59NC
Neutral Overvoltage Relays are sensitive enough to differentiate between these conditions and act
decisively.
Figure 1-1. Ungrounded 3-Phase, 3-Wire System
Input Sensing
BE1-59NC Neutral Overvoltage Relays receive the input signal from voltage sensing devices connected
between the capacitor bank neutral and ground. These voltage sensing devices can be potential
transformers or resistor potential devices. Ideally, the voltage across each leg of a capacitor bank is
balanced, and the voltage from neutral to ground is zero. If a single capacitor fails and blows the protecting
fuse, an unbalanced condition occurs that shifts the neutral and creates a small but measurable voltage.
Through the potential sensing devices, the neutral relay senses this voltage unbalance and reacts to give
the appropriate signal (usually an alarm or trip depending on the voltage level).
Further loss of more capacitors increases the neutral voltage. The relay senses this voltage increase, and
reacts to give the appropriate signal. This signal is usually a trip depending on the voltage levels and how
the protection scheme is designed.

BE1-59NC General Information
1-3
Alarms And Outputs
Sensitive settings on the relay are used as an alarm to alert that a fuse has blown and maintenance is
required. They would be typically set at a level corresponding to the voltage rise caused by one blown fuse.
The second output would have a setting that would be set to trip the capacitor bank off the bus or line when
the voltage exceeds 110% of the nominal capacitor bank voltage. This setting depends on the capacitor
bank size and configuration.
MODEL AND STYLE NUMBER DESCRIPTION
BE1-59NC Neutral Overvoltage Relays electrical characteristics and operational features are defined by a
combination of letters and numbers that make up the style number. Model numbers BE1-59NC designate
the relay as a Basler Electric, Class 100, Relay. 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.
Sample Style Number
Style number identification chart (Figure 1-2) defines the electrical characteristics and operational features
includedinBE1-59NC Neutral OvervoltageRelays. Forexample,ifthe model numberoftherelaywasBE1-
59NC, and the style number was A5E-E2J-C0S1F, the device would have the following features:
A- Single-phase voltage
5- 120 Vac, 60 Hz, nominal 1 to 20 Vac pickup
E- Two output relays with normally open contacts
E2 - Two setpoints; setpoint 1, definite timing 00.0 to 99.9 seconds; setpoint 2, definite timing
00.0 to 99.9 seconds
J- 125 Vdc or 100/120 Vac power supply
C- Internally operated targets
O- None
S- Push-to-energize outputs
1- Two auxiliary output relays, two SPDT sets of contacts; one for setpoint 1 and one for
setpoint 2
F- Semi-flush mounting case

BE1-59NC General Information
1-4
Figure 1-2. Style Number Identification Chart
SPECIFICATIONS
BE1-59NC Neutral Overvoltage Relays have the following features and capabilities.
Voltage Sensing Inputs Maximum continuous rating: 360 Vac for 100/120 Vac input, 480 Vac for
200/240 Vac input, with a maximum burden of 2 VA.
Sensing Input Ranges
Ranges 1 and 5 1 to 20 Vac pickup
Ranges 2 and 6 10 to 50 Vac pickup
Ranges 3 and 7 2 to 40 Vac pickup
Ranges 4 and 8 20 to 100 Vac pickup

BE1-59NC General Information
1-5
Pickup Accuracy
Ranges 1, 3, 5, or 7 ±2.0% or 100 millivolts, whichever is greater.
Ranges 2, 4, 6, or 8 ±2.0% or 200 millivolts, whichever is greater.
Dropout 98% of pickup within 7 cycles.
Timing Characteristics
Inverse Responsetimedecreasesasthedifferencebetweenthemonitoredvoltage
and the setpoint increases. The inverse time characteristics switch is
adjustable from 01 to 99 in 01 increments. Each position corresponds to
a specific curve except 00, which is instantaneous.
Definite Adjustable from 00.1 to 99.9 seconds, in steps of 0.1 seconds. Accuracy
is within 2.0 % or 100 milliseconds, whichever is greater. (A setting of 00.0
provides instantaneous timing.)
Accuracy Within±5%or25.0milliseconds(whicheverisgreater)oftheindicatedtime
for any combination of the time dial and within ±2% of the voltage
magnitude or 100 millivolts (for the 100/120 Vac sensing ranges) or 200
millivolts (for the 200/240 Vac sensing ranges) (whichever is greater) from
the actual pickup value. Inverse time is repeatable within ±2% or 25.0
milliseconds (whichever is greater) for any time dial or pickup setting.
Power Supply Refer to Table 1-1.
Table 1-1. Power Supply Specifications.
Type Nominal Input
Voltage
Input
Voltage
Range
Burden
at
Nominal
J 125 Vdc
120 Vac 62 to 150 Vdc 90 to 132 Vac 7.5 W 15.0 W
K 48 Vdc 24 to 60 Vdc 7.0 W
†L 24 Vdc 12 to 32 Vdc 7.5 W
‡Y 48 Vdc
125 Vdc 24 to 60 Vdc 62 to 150 Vdc 7.0 W 7.5 W
Z 250 Vdc
230 Vac 140 to 280 Vdc 190 to 270 Vac 12.0 W 33.5 VA
NOTES:
†Type L Power Supply may require 14 Vdc to begin operation.
Once operating, the voltage may be reduced to 12 Vdc.
‡Type Y Power Supply is field selectable for 48 or 125 Vdc.
Selection must be implemented at time of installation. This Power
Supply option is factory set for 125 Vdc.
Output Contacts 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

BE1-59NC General Information
1-6
0.1 A.
Output Contacts - Continued
Inductive:
120/240 Vac, Make and carry 30 A for 0.2 seconds, carry 7 A continuously, and break
125/250 Vdc 0.3 A. (L/R = 0.04).
Target Indicators Targets indicators are operated by a minimum of 0.2 A through the output
trip circuit. The output circuit must be limited to 30 A for 0.2 seconds, 7 A
for 2 minutes, and 3 A continuously. Target coil resistance is 0.1 ohm.
Isolation 1500 Vac at 60 hertz for one minute in accordance with IEC 255-5 and
ANSI/IEEE C37.90-1989 (Dielectric Test).
Radio Frequency Field Tested using a five watt, hand-held transceiver operating at random
Interference (RFI) frequencies centered around 144 MHz and 440 MHz, with the antenna
located six inches from the relay in both horizontal and vertical planes.
SurgeWithstandCapability QualifiedtoANSI/IEEEC37.90.1-1989
StandardSurge Withstand Capabil-
ity (SWC) Tests for Protective Relays and Relay Systems.
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 per-
pendicular planes, swept over the range of 10 to 500 Hz for a total of six
sweeps,15minuteseachsweep,withoutstructuraldamageordegradation
of performance.
Weight 13.6 pounds maximum.
Case Size S1.
CHARACTERISTIC CURVES
Figures1-3 (drawing number 99-1510) and1-4 (drawing number 99-1545) illustratethe overvoltage inverse
time curves for this relay. To order a full-size drawing on transparent paper (vellum) of these characteristic
curves, contact Customer Service Department of the Power Systems Group, Basler Electric, and request
the appropriate drawing number.

BE1-59NC General Information
1-7
Figure 1-3. Overvoltage Inverse Time Curves, Low Ranges
(Drawing Number 99-1510)

BE1-59NC General Information
1-8
Figure 1-4. Overvoltage Inverse Time Curves, High Ranges
(Drawing Number 99-1545)

2-1
SECTION 2
CONTROLS AND INDICATORS
GENERAL
Table 2-1 lists and describes the controls and indicators of BE1-59NC Ground Fault Overcurrent Relays.
Table 2-1. Controls and Indicators (Refer to Figure 2-1)
Letter Control or Indicator Function or Indicator
A OVERVOLTAGE 1 PICKUP
Adjustment A multiturn potentiometer that sets the overvoltage comparator threshold voltage. Continuously adjustable for
the sensing input voltage range.
B OVERVOLTAGE 1 PICKUP
LED A red LED that lites when overvoltage exceeds the pickup setting.
C OVERVOLTAGE 1 TIME
DIAL Thumbwheel switch that selects the desired overvoltage
output delay (inverse time characteristic curves 01 through
99). A setting of 00 is instantaneous.
D OVERVOLTAGE 2 TIME
DIAL Thumbwheel switch that selects the desired overvoltage
output delay (definite timing characteristic adjustable from
00.1 to 99.9 seconds, in 0.1 second increments). A setting
of 00 is instantaneous.
E POWER LED LED lites to indicate that the relay power supply is
functioning.
FTarget Reset Lever Linkage extending through bottom of front cover that resets
magnetically latching target indicators.
GTarget Indicators Magnetically latching targets that indicate that trip current in
excess of 0.2 A was present and that the associated output
relay has been energized.
H PUSH TO ENERGIZE
OUTPUT Switches Momentary pushbutton switches accessible by inserting a
1/8 inch diameter non-conducting rod through the front
panel. Pushbuttons are used to energize the output relays
to test external system wiring. If current flows in externally
operated target trip circuits, the targets drop.
I OVERVOLTAGE 2 PICKUP
LED A red LED that lites when overvoltage exceeds the pickup setting.
J OVERVOLTAGE 2 PICKUP
Adjustment A multiturn potentiometer that sets the overvoltage comparator threshold voltage. Continuously adjustable for
the sensing input voltage range.

BE1-59NC Controls and Indicators
2-2
Figure 2-1. Location of Controls and Indicators.

3-1
SECTION 3
FUNCTIONAL DESCRIPTION
GENERAL
BE1-59NC Neutral Overvoltage Relays are solid state digital devices that detect ground faults and
neutral overvoltages. Figure 3-1 illustrates the overall operation of the relay and the following
paragraphs describe the functional description.
Figure 3-1. Functional Block Diagram
FUNCTIONAL DESCRIPTION
Inputs
Sensed voltage developed across the input sensing device connected in the neutral-grounding current
transformer secondary is applied to the BE1-59NC Neutral Overvoltage Relay. Internal transformers
provide further isolation and step down for the relay logic circuits. BE1-59NC Neutral Overvoltage
Relays may also be used in ungrounded systems with voltage transformers connected in wye/broken
delta configurations. Typical connection methods are shown in Section 4. Overvoltage #1 and
Overvoltage #2 circuits are functionally the same except for timing characteristics.
Filters
Bandpass filters provide peak sensitivity at 50 or 60 hertz for the overvoltage #1 and overvoltage #2
inputs. Third harmonic rejection is 40 dB minimum.

BE1-59NC Functional Description
3-2
Overvoltage Comparator
Each overvoltage comparator circuit receives a sensing voltage from the bandpass filter and a reference
voltage from the front panel setting. When the input exceeds the setting reference, the comparator
output enables the timing circuit and the OVERVOLTAGE PICKUP LED turns ON.
Definite Time Delay
An output signal from the comparator circuit enables a counting circuit to be incremented by an internal
clock. When the counting circuit reaches the count that matches the number entered on the TIME DIAL,
the output relay and auxiliary relay are energized. However, if the sensed input voltage falls below the
pickup setting before the timer completes its cycle, the timer resets within 2.0 cycles.
The definite time delay is adjustable from 00.1 to 99.9 seconds in 0.1 second increments. Front panel
mounted switches determine the delay. Position 00.0 is instantaneous.
Inverse Time Delay
Inverse time delay circuits are identical to definite time delay circuits except that a voltage controlled
oscillator (VCO) is substituted for the clock signal. The VCO is controlled by a voltage derived from the
sensed input. Because the frequency of the oscillator is kept proportional to the sensed input voltage,
the desired inverse time delay is produced.
Inverse time characteristic curve thumbwheel switches are setable from 01 to 99 in 01 increments. Each
position corresponds to a specific curve setting except 00, which is instantaneous. Refer to Figures 1-3
and 1-4 to see the inverse time characteristic curves.
Reference Voltage Circuit
A constant voltage source provides a reference voltage to the potentiometers on the front panel. The
potentiometers, in turn, provide reference voltages to all the comparator circuits and establish the
threshold for each circuit.
Power Supply
The solid-state power supply is a low burden, flyback switching design that delivers a nominal plus or
minus twelve volts dc to the internal circuitry. Power supply inputs are not polarity sensitive. A red LED
lites to indicate that the power supply is functioning properly.
Power Supply Status Contacts
Power supply output contacts are monitored at the mother board. Normal supply voltage causes the
status relay to be continually energized. However, if at any time the voltage falls below requirements,
the relay drops out, and closes the normally closed contacts.
Target Indicator Circuits
A front panel target indicator is provided for each overvoltage element. These targets operate only when
a minimum of 0.2 amperes flows in the output circuit. A special reed relay in series with the output
contact provides the signal to the target indicator. Each target, when operated, is magnetically latched
and must be reset manually.

4-1
SECTION 4
INSTALLATION
GENERAL
When not shipped as part of a control or switchgear panel, the 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 occurred during shipment. If there is evidence of damage, immediately file a claim with the
carrier and notify 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 (Secton 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. Do not touch target indicator vanes. Always reset targets by use of the target reset lever.
3. The relay is a solid-state device. If a wiring insulation test is required, remove the connection
plugs and withdraw the cradle from its case.
4. When the connection plugs are removed, the relay is disconnected from the operating circuit 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.
5. 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 IEC 255-5 and ANSI/IEEE C37.90-1978, one-minute dielectric (high potential) tests
up to 1500 Vac (45-65 hertz) may be performed. This device employs decoupling capacitors to ground
from the input and output terminals. Leakage current of less than 5 milliamperes is to be expected at the
grouped power supply inputs or sensing inputs and less than 20 milliamperes at the outputs.
RELAY MOUNTING
Because the relay is of solid state design, it does not have to be mounted vertically. Any convenient
mounting angle may be chosen. Figures 4-1 through 4-13 provide relay outline dimensions and panel
drilling diagrams.

BE1-59NC Installation
4-2
Figure 4-1. S1 Case, Panel Drilling Diagram, Semi-Flush Mounting
Figure 4-2. S1 Case, Outline Dimensions, Front View

BE1-59NC Installation
4-3
Figure 4-3. S1 Case, Double-Ended, Semi-Flush Mounting, Side View