Model 933A Portable Power Sentinel™

The perfect field analyzer for the power quality engineer, Model 933A Portable Power Sentinel™ is the most accurate and affordable portable power quality meter in the industry. The proprietary EnergyDSA™ Digital Signal Analysis algorithms allow the user to measure or record harmonics, flicker (per IEC 61000-4-15, PST and Instantaneous), K-factor and interruptions. The data logging capabilities allow the user to specify which data to log as well as when to log the data, continuously or when user specified thresholds are exceeded.

Time, Phase and Frequency Capabilities

Model 933A has the ability to also measure system time, phase, frequency and phasors. When synchronized using the IRIG-B IEEE-1344 unmodulated input or the GPS input, the Model 933A is capable of accurate revenue metering and synchrophasor analysis per the IEEE-1344. Pre-fault data is buffered for a half second allowing for accurate fault recording and event driven data analysis. The host processor and the DSP each have 128 MB of memory which provides ample space for data storage

Portability

Thanks to the high level of integration made possible with EnergyDSA™, this unit combines multiple capabilities into one compact, light weight instrument. Weighing less than 5.8 kg (12.8 lbs), the Portable Power Sentinel™ is a power quality monitor, a data and event logger, a system monitor, and a revenue meter designed to accompany you wherever you go and operate continuously for a full eight-hour shift. The unit comes pre-assembled with the adjustable tilt handle/bail assembly for easy transportability

Specification

Produkt Specifikation

Input/Output

Configuration

3 Ø:3-element, 2½-element, 2-element, selectable
1 Ø:2-element, 1½-element, 1-element, selectable

Voltage

Range (3 Ø/1 Ø)1 Vrms to 650 Vrms, selectable (phase-to-phase for 2 and 2½-element; phase-to-neutral for 1 and 3-element)
Overrange1200 V peak, nominal

Current

Model 933A-01 20 Amp direct input module:

Range (3 Ø/1 Ø)0.05 Arms to 20 Arms, selectable, per element
Low Range1 mA to 1 Arms
Overrange40 A peak, nominal (maximum continuous input current: 20 Arms per element, all ranges

VA, W, VAR

RangeAny voltage, current and number of elements within the specified limits

Compensation

CT and PTBoth magnitude and phase compensation, CT with 12 point nonlinear interpolation
TransformerBoth iron and copper loss

Frequency

Range45 Hz to 65 Hz, for specified accuracy
Harmonicsto 3 kHz

Inputs

VoltageSafety banana plugs
Current5-way binding posts (Model 933A-01)
Insulation400 volts, nominal, to neutral/chassis, surge voltage class III
600 volts, nominal, to neutral/chassis, surge voltage class II

Power Quality

Harmonics Measurement

Standard2nd to 50th (50 Hz or 60 Hz) per IEC 61000-4-7, 100 ms overlapping data window
MeasurementsTHD, K-factor, rms harmonic current and voltage, rms harmonic current and voltage with K-factor compensation (each harmonic magnitude is multiplied by the square of the harmonic number before summing), individual magnitude and phase
Logged DataSelectable, may be regularly logged or registered. Event-logged also available when user-specified limits are exceeded

Interruptions Logged Data

Selectable, may be regularly logged or registered. Event-logged also available when user-specified limits are exceeded.

Flicker

StandardPer IEC 61000-4-15, PST and Instantaneous
Logged DataSelectable, may be regularly logged or registered. Event-logged also available when user-specified limits are exceeded.

Limit Alarms

FunctionsUpper or lower limits may be set on most measured functions. Limits may also be set on maximum imbalance (ratio of Zero and Negative Sequence Components to Positive Sequence)
OutputVia system interface and display

Accuracy/Specifications

Accuracy Note

Accuracy specifications include all sources of uncertainty. Except as noted, specifications apply for the full operating range, including temperature (- 10 °C to + 50 °C), line voltage, input range including specified overrange, power factor, input frequency, and drifts over a one-year calibration interval. Specifications assume synchronization to GPS and operation in 3-element mode or in a well-balanced system where imbalance does not degrade accuracy.

Watts

0.05 % of reading, for voltage 7 Vrms to 650 Vrms and current 10 mA to 20 Arms and PF > 0.2

Vrms

0.05 % of reading or ± 5 mV, whichever is greater. (For voltage 50 Vrms to 650 Vrms and current 50 mA to 20 Arms)

Arms

0.05 % of reading or ± 0.1 mA, whichever is greater. (For voltage 50 Vrms to 650 Vrms and current 50 mA to 20 Arms)

Phase Angle, Ø

Ø: 0.01 °, phase-to-phase or voltage-to-current (For voltage 50 Vrms to 650 Vrms and current 50 mA to 20 Arms)
0.2 % (current 10 mArms to 50 mArms)

Ø underrange: 0.05 ° of reading (current 10 mArms to 50 mArms)

VA, VAh

0.05 % of reading (For voltage 50 Vrms to 650 Vrms and current 50 mA to 20 Arms)
0.1 % (current 10 mArms to 50 mArms)

VAR, VARh

same as W, Wh except replace PF with (1 – PF2)0.5

Power Factor

0.0002 · sin (Ø) (For voltage 50 Vrms to 650 Vrms and current 50 mA to 20 Arms)
0.001 · sin (Ø) (current 10 mArms to 50 mArms)

Harmonics

0.1 % THD or 5 % of reading, whichever is greater

Frequency

< 1 ppm (0.0001 %) of reading, 50 Hz or 60 Hz nominal, plus timebase error

System

Phase0.03 ° + [timebase error · 360 ° · frequency] (With GPS Option)
Time1 µs + timebase error (With GPS Option)

Event Inputs

± 10 µs (typical)

Flash Memory Data Storage

Host Processor

Capacity128 MB. See Operation Manual for record length and capacity calculations
DataAll functions measured and totalized by Model 933A; each record is stored with a time tag
Storage RateSelectable
Event data stored upon occurrence
Lifetime100,000 storage cycles minimum
Data RetentionIndefinite; no power or battery is required to retain data

DSP Processor

Capacity128 MB; about 1000 seconds or 17 minutes
DataPrimary waveform
Storage Rate10240 samples per second (approximately 170 samples per cycle). Fixed 30 cycles pre-fault data. Event data stored to Host Processor flash memory upon occurrence. User has same triggers as the Host Processor flash and can select the maximum fault duration, post fault recording time, and retrigger on/off.
Lifetime100,000 storage cycles minimum
Data RetentionIndefinite; no power or battery is required to retain data

System Control and Monitoring

System Time, Phase and Frequency

System TimeUnlimited accumulation with ± 1 µs resolution
Frequency6 digits, xx.xxxx Hz
System Phase0 ° to 360 ° with 0.01 ° resolution

Phasors

StandardPer IEEE Standard 1344 or PSCSV
Rate20 measurements/second

Interface

Operator

Display320 pixel x 240 pixel graphic LCD display with CCFL Backlight
Keyboard30 keys: 5 soft function, 7 dedicated function, 5 cursor control, power on/off and 12 key numeric key pad

Communications

SerialRS-232, RJ-11 modular connector
USBVersion 1.1, B-Type receptacle

Protocols

ProprietaryPowerSentinelCSV 933 (PSCSV933)

Synchronization

IRIG TTL-Level Shift

TTL-Level Shift per IEEE-1344 as output from an Arbiter Systems Model 1084B

General/Remote

Optional Remote GPS receiver available. See Accessory AS0077600

GPS TrackingGPS-L1 (1575.42 MHz); 12 channel (tracks up to 12 satellites)
GPS Acquisition2 minutes typical
GPS AccuracyUTC-USNO ± 1 µs (only need 1 satellite with correct position)
GPS Out of LockVia system interface and status display; optional, via contact closure

Timebase Error

GPS LockedLess than 1 µs, when locked to at least one satellite with correct position
Unlocked10 ppm, typical, after being locked for 10 minutes minimum
IRIG-BLess than 1 µs + accuracy of IRIG-B source

General

Physical

Size205 mm x 305 mm x 225 mm (8 in x 12 in x 8.8 in)
483 mm x 483 mm x 305 mm (16 in x 16 in x 12 in), shipping
Weight5.8 kg (12.8 lbs), maximum
9.1 kg (20 lbs), shipping

Environmental

TemperatureOperating: – 10 °C to + 50 °C
Nonoperating: – 40 °C to + 75 °C
HumidityNoncondensing

Power Requirements

Internal Battery

TypeNiMH
OperationEight hours typical
ChargingFour hours
Stand by Use5 VA typical

External Power

Range85 Vac to 264 Vac, 47 Hz to 63 Hz or 120 Vdc to 275 Vdc, 25 VA typical when charging battery, 5 VA typical standby use
InputIEC connector with fuse; surge withstand per ANSI C37-90.1 and IEC801-4 standard
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