SPWK

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Description
HC model SPWK watt / var transducers are compact, designed to be a very accurate mode with DC 1mA output directly proportional to an AC rated input. output of watt & var are isolated each other to eliminate ground effect. for utility, the unit are useful including industry, laboratories & process control requiring accurate power or engergy measurements.

 

Model & Ordering
 
    Model...SPWK
    101 - 1 phase / 2 wires ... 1 element
    201 - 3 phase / 3 wires ... 2 element
    301 - 3 phase / 4 wires ... 3 element
Specification
  • Accuracy : 0.25% RD + 0.02%RO / 23 + 3 oC
  • Input ( each element ) :
    • Range : Effective voltage 85-150V; current 0-6A
    • Over capability :
      • Voltage 200V continuous 250V ... 10sec / hour; 500V ... 2sec / hour
      • Current 15A continuous 50A ... 10sec / hour; 250A...1sec / hour; 400A ... 0.5sec / hour
    • Burden : Voltage < 0.1VA at 120V input; current < 0.2VA at 5A input
    • Frequency : Watt 57-63Hz; Var 60Hz only
    • Protection : Full protection for SURGE, EMI & RFI
  • Output ( isolated with input ) :
    • Range :
      •         
    • Output load : Maximum 10Kohm for 0 to +1 mA ouput
    • Output impedance > 30 Mega ohm
    • Response time < 400 ms from 0 to 99% RO at operating
    • Ripple < 0.5% P-P RO
    • Long term stability < 0.1% RO per year ( typically )
    • Temperature stability < 0.01% per degree C, from 0 to 55oC
    • Adjustment : Span +5% / 10%; zero +2.5% / 5% on request
    • Protection : No damage ... open or short; full prtection ... SURGE, EMI, RFI
    • Magnetic effection < 0.04% at center 400 A-T / M
  • Power Supply : AC 115 + 20%, 50-70Hz, < 6VA
  • Operation Condition :
    • Enviroment Temperature : -5 ~ 60 oC
    • Humidity : 20~99% RH non condensed
    • Elevation : Under 3000 meters
    • Magnetic Field : 500 A-T / M
    • Waveform :
      • Watt - Fundamental with 20% 3rd harmonics
      • Var - Sinusoidual
    • Power Factor : Any
    • Dielectric strength : 4KV AC rms 1 minute between input / output / power / case IEC688
    • Impulse Test : ANSI C37.90 / 1989, IEEE 587 / 1983, IEC255-3, 6KV (1.2 * 50 us), 3KA (8 * 20 us) ..... current only
    • Surge Test (ring wave) : IEEE 587 / 1983 (3KV - 0.5 us / 100 KHz), IEC255-3 (2.5KV - 0.25ms / 1MHz)