Hsiang Cheng Model SPWK

Utility Watt / Var Transducer Series

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Hsiang Cheng  SPWK Var/Watt transducers

Characteristics :
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  • Standard output of 0-1 mADC
  • Base accuracy of 0.25% +0.02% ro of reading
  • Dual Isolated outputs Watt/Var eliminating gorund effects
  • High magnetic field immunity
  • Meets IEEE SWC Test
Product Description:
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space HC model SPWK watt / var transducers are compact, accurate units with a 1mADC output that is directly proportional AC rated input. Watt & var circuits are isolated to eliminate inaccuracies due to ground effect. These units are ideal for utility and process control applications.
Model Application calibration vs output span( Watt / Var ) = D
WattsVars Elements V1 = 120 V V2 = 240 V
5A 5A
SPWK101 1E 1Ø 2W 500 1k
SPWK201 2E 3Ø 3W* 1k 2k
SPWK301 3E 3Ø 4W* 1.5k 3k
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Specifications :
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General Specifications
Accuracy ( 23±3°C ): 0.25% RD + 0.02%RO / 23 + 3° C
Effective voltage: 85-150V; current 0-6A
Over capability : Voltage 200V continuous 250V … 10sec / hour; 500V … 2sec / hourCurrent 15A continuous 50A … 10sec / hour; 250A…1sec / hour; 400A … 0.5sec / hour
Dielectric strength : 4KV AC rms 1 minute between input / output / power / case IEC688
Burden : Voltage < 0.1VA at 120V input; current < 0.2VA at 5A input
Frequency : Watt 57-63Hz; Var 60Hz only
Surge and impulse test ANSI C37.90 / 1989, IEEE 587 / 1983, IEC255-3, 6KV (1.2 * 50 us), 3KA (8 * 20 us) ….. current onlySurge Test (ring wave) : IEEE 587 / 1983 (3KV – 0.5 us / 100 KHz), IEC255-3 (2.5KV – 0.25ms / 1MHz)
Waveform: Watt – Fundamental with 20% 3rd harmonicsVar – Sinusoidual
Power Supply : AC 115 + 20%, 50-70Hz
Output ( isolated with input ) :
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 operatingRipple < 0.5% P-P RO
Stability
Temperature stability < 0.01% per degree C, from 0 to 55°C
Long term stability< 0.1% RO per year ( typically )
Storage condition Temperature range -20 to 70°C, RH 20 to 95% non condensed
Operating condition Temperature range -5 to 60 °C, RH 0 to 99% non condensed
Magnetic field effect < 0.04% at center 400 A-T / M
Power dissipation: < 6VA
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