931A Power System Analyzer
: 전력계통분석기 (3-Phase)  
   
   


931A 의 특징

용도: 전압, 전류, 전기량, 고조파, 위상, 트랜듀서(TD), Timer 등을 측정.
사용전압: 110 - 220 V AC 또는 Battery (재충전)

- 뛰어난 정확성으로 다른 장비에 대한 Calibration 장비로도 사용됨.
   * Doble Engineering Company 등.
- 가볍고 사용방법이 간편.
- 측정치의 저장 및 Review 가능, PC로 다운로드




Basic Measurements:

PowerDSA™를 이용한 Rms, Phase angle, Frequency, Voltage, Current 를 측정한다.

Accuracy:
전압, 전류: 0.05 %
위상: 0.05 °
Power Quantities
Watts (W), watthours (Wh), volt-amperes (VA), volt-ampere hours (VAh), volt-amperes reactive (VAR), volt-amperes reactive hours (VARh), and power factor (PF): PowerDSA™ analysis measures them all, with 0.11% basic accuracy.
Harmonics
total harmonic distortion (THD), even harmonic distortion (EHD), odd harmonic distortion (OHD) or K-factor; or as individual harmonic amplitude and phase.
ch1, ch2 입력의 각 고조파 크기표시.
최대 50차 고조파까지 표시가능


Waveform Display
You can view the signal waveforms for both channels on the high contrast 240x64 graphic display. Both channels are normalized to Channel 1 fundamental phase, so you can see, for example, the relationship between current waveform distortions and voltage phase.

Timer
The Model 931A's timer/counter measures relay operating times or elapsed test times, or counts input rates and events. View times in seconds or in terms of power-line cycles. Both inputs are independently opto-isolated for safety and flexibility.

Three-Phase Measurement

-Basic three-phase display
View voltage, current, phase, frequency and power quantities on one convenient display.

-Vector display
View voltages, currents and phase angles with their vector representation.
Voltage/Current Sequence display
View voltage, current and phase along with positive, negative and zero sequence values.

-Energy display
View voltage, current, phase, frequency and energy quantities on one convenient display.
Transducer Calibration
The outstanding accuracy of the Model 931A with PowerDSA™ is ideal for transducer calibration. The Model 931A includes the necessary dc voltage and current measurements to accurately measure transducer outputs, using a separate, opto-isolated input section. With only an external source or load box, or when making in-service measurements, the Model 931A provides complete field transducer calibration.

CT/PT Ratios
 Correction factors for external CTs and/or PTs, can be entered to display the measured results in input-side units. You can even measure ratios using the instrument's CH1/CH2 function. This example shows a nominal 200:1 (or 1000:5) current ratio; if Channel 1 is a CT burden voltage and Channel 2 CT secondary current, the result is the loop resistance in ohms.

Extended Measurement Ranges
For greater accuracy, the Model 09311A Auxiliary CT allows measurement of signals up to 400 amps with total basic accuracy of 0.1%. This CT mounts directly to the Model 931A, 930A, or 929A current input connectors and may be used for one two or three of the current inputs, depending on your needs.