Bently Nevada 3500/82 Data sheet
Stator Insulation Monitoring System
Bently Nevada* Asset Condition Monitoring
Description
The Bently Nevada* Stator Insulation Monitoring System uses state of the art
technologies to measure the leakage current of motors sized up to 7.5 kV and
1000 Amps. The measurements are made while the motor is online and the
system processes the measured data in real time to determine the condition of
the stator insulation in the motor. The system consists of a 9-channel 3500/82
monitor that accepts inputs from the 350820 High Sensitivity Current
Transformer (HSCT), 350822 High Voltage Sensors (HVS), and 4-20 mA process
signals corresponding to motor temperature measurements. The 3500/82
processed data and results can be displayed on the 3500/94 Display. The user
can configure the 3500/82 using the 3500 Rack Configuration Software to
perform the following functions:
Display instantaneous stator leakage current on each phase of the
motor.
Display compensated dissipation factor and change in dissipation factor
Note: The 3500/82 monitor should not be used for machine protection.
The 3500/82 can accept 3 HSCT, 3 HVS, and 3 4-20mA process inputs from
stator RTD temperature measurements. Since the interface modules are
capable of driving long field cables, the monitor can be situated in a control or
instrumentation room up to 330 meters (1,000 feet) away from the motor or the
interface modules.
The 3500/82 is featured with measurement trending by comparing the current
measurements to any historical data taken in the last 10 years (if the historical
data is available). The time window for comparison is user configurable.
The 3500/82 monitor has eight buffered outputs for diagnostic purposes, 3 each
HVS and HSCT values for each of those corresponding inputs, an average
temperature from the temperature inputs, and a synchronization phase pulse
reference signal.
from a given reference point.
Display motor stator temperature and average temperature.
Display line voltage and frequency data values.
Retrieve historic data stored on board the monitor for data analysis.
Set alarm levels for annunciation.
Configure the temperature range and time period for learn and extend
modes for temperature learning, and view the current learning state.
View the number of temperature samples, vs. operating temperatures,
that builds the learning curve used for temperature compensation.
Specifications and Ordering Information
Part Number 323735-01
Rev. C (07/14)
Page 1 of 13
Monitor Specifications
Parameters are specified from +20 °C to +30 °C (+68 °F
to +86 °F) and at 50/60 Hz unless otherwise indicated.
Note: Operation outside these specified limits may result in a larger
variation in readings from what is listed below, or a loss of machine
monitoring all together.
Inputs
Input Signals
Accepts 3 HSCT, 3 HVS, and 3 420mA temperature inputs.
Input
Impedance
150 kΩ // 1nF (for HSCT & HVS)
200 Ω (for 4-20 mA temperature)
Input
Frequency
Range
40 to 70 Hz
Power
Consumption
(not including
external power
supply)
15 watts, typical
HSCT External
Power
Required
+24V ± 2% @ 0.75 A Nominal Over
temperature
Outputs
Front Panel
LEDS
OK LED
Indicates when the system is
operating properly.
TX/RX LED
Indicates when the 3500/82 is
communicating with other modules
in the 3500 rack.
Bypass LED
Indicates when the 3500/82 is in
Bypass Mode.
Buffered Outputs
The front of the monitor has eight
coaxial BNC connectors for each of
the HVS and HSCT outputs and
average temperature output, and a
phase reference pulse (Sync). Each
connector is short-circuit protected.
The output from all 8 BNCs is
voltage proportional to the input
signals.
Output
Impedance
499Ω ±1%
Output Range
HVS and HSCT
Channels (6
BNCs)
Dynamic: 1.6 to 10.4V, ±5%.
Bias: 6V ±5%.
Output Range
Average
Temperature
Channel (1
BNC)
2.0 to 10.0V, ±5%, for -40 to 200 °C
(default, but can be user
configurable)
Output Range
Sync (1 BNC)
Digital Pulse: 0 to 10.0V, ±5%.
Sensor Specifications
Parameters are specified from +20 °C to +30 °C (+68 °F
to +86 °F) and at 50/60 Hz unless otherwise indicated.
Note: Operation outside these specified limits may result in a larger
variation in readings from what is listed below, or a loss of machine
monitoring all together.
Sensitivity
HSCT Output
Sensitivity
3.3mV / mA nominal, each unit
marked with its specific sensitivity
±1%
Linearity: ±0.25%
Phase
Specifications and Ordering Information
Part Number 323735-01
Rev. C (07/14)
Page 2 of 13
6° nominal, each unit marked with
specific phase shift for that unit,
±0.5°.
Linearity: ±0.5°
Temperature impact on phase: +2°
at minimum operating temperature,
-1° at maximum operating
temperature.
Current
1.4 A peak to peak (sine wave) fullscale.
HVS Output
0.76mV / V ±5%
8 kVrms full-scale (line to neutral)
Interface Module Outputs
HSCT Interface
Module Output
Gain: 3V/V
HVS Interface
Module Output
Gain: 0.625V/V with 77 kΩ source
impedance
Temperature
Interface
Module Output
66.6 µA / °C ±2%. (default)
-40 to 200
°C full-scale (user
configurable)
Signal Conditioning in 3500/82 Monitor
HVS and HSCT
Overall
Frequency
Response
Direct
1 Hz to 8.5 kHz ±3.0 dB
User configurable
1X Filter
50 or 60 Hz
User configurable
Overall Accuracy
Amplitude
±1% of full-scale, Typical
±2% of full-scale, Maximum
Phase
±1°, Typical
±2°, Maximum
Filter Quality
High-Pass
2-pole (40 dB per decade)
Low-Pass
2-pole (40 dB per decade
Overall
Accuracy
±1% of full-scale, Typical
±2% of full-scale, Maximum
Temperature
Overall
Frequency
Response
3 Hz -3.0 dB
Overall
Accuracy
±1% of full-scale, Typical.
±2% of full-scale, Maximum.
Filter Quality
Low-Pass
2-pole (40 dB per decade)
Overall
Accuracy
±1% of full-scale, Typical.
±3% of full-scale, Maximum.
System Alert/Alarm Setting
Alarm
Setpoints
The user can use software
configuration to set Alert levels for
each value measured by the
monitor and Alarm setpoints for any
values measured by the monitor.
Alarms are adjustable from 0 to
100% of full-scale for each
measured value.
Specifications and Ordering Information
Part Number 323735-01
Rev. C (07/14)
Page 3 of 13
Alarm Time
Delays
The user can program alarm delays
using software as follows:
Alert & Danger
From 1 to 60 seconds in 1 second
Intervals.
Note: Applies to temperature, voltage and current measurements.
The 3500/82 system Alert/Alarms are for annunciation only and
should not be used for machine protection.
Environmental Limits
Operating Temperature Range
Transducers &
Interface Modules
−20 °C to +70 °C
(-4 °F to +158 °F)
3500/82 Monitor
−30 °C to +65 °C
(-22 °F to +149 °F)
MTL and P+F
Barriers
−20 °C to +60 °C
(-4 °F to +140 °F)
Storage Temperature
Transducers /
Interface Modules
−40 °C to +85 °C
(-40 °F to +185 °F)
3500/82 Monitor
−40 °C to +85 °C
(-40 °F to +185 °F)
MTL Barriers
−40 °C to +80 °C
(-22 °F to +149 °F)
P+F Barriers
−25 °C to +70 °C
(-13 °F to +158 °F)
Shock Survivability
Transducers
100 g peak, maximum
Interface Modules
200 g peak, maximum
3500/82 Monitor
200 g peak, maximum
Relative
Humidity
95% non-condensing
(75% non-condensing for P+F
barriers)
Magnetic Field
Susceptibility
<500µV/gauss (50 gauss, 50-60Hz)
Transducers
Common Mode
Line Current
Up to 1,000A rms, nominal
Line Voltage
†
Up to 7.5kV
rms, nominal
†
Operating voltage less than 2kV has limitations from the HVS.
Physical
Monitor Module
Dimensions
(Height x Width x Depth)
241.3 mm x 24.4 mm x 241.8 mm
(9.50 in x 0.96 in x 9.52 in)
Weight
0.97 kg (2.14 lb.)
I/O Module
Dimensions
(Height x Width x Depth)
241.3 mm x 24.4 mm x 91.1 mm
(9.50 in x 0.96 in x 3.90 in)
Weight
0.41 kg (0.91 lb.)
Rack Space Requirements
Monitor Module
1 full-height front slot
I/O Module
1 full-height rear slot
HVS and HSCT Interface Modules
Dimensions
(Height x Width x Depth)
Specifications and Ordering Information
Part Number 323735-01
Rev. C (07/14)
Page 4 of 13
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