RD-31 Dytronic Three-Phase Reference Standard
Features
Measurement
The RD-31 registers both forward and reverse energy flow and provides voltage, current, power and energy (Active, Reactive, Apparent) information.
Meter and Standard Testing
The RD-31 can be used with a controlled current source to test revenue meters and reference standards. In field applications the RD-31 can perform a true three phase meter accuracy test using existing service load.
Analog Sense
The RD-31’s Optional analog sense feature enables testing transducers and energy meters that provide an analog output from zero to 2 mA.
Overview
PRODUCT HIGHLIGHTS
The Radian RD-31 Three-phase Electricity Reference Standard achieves a level of accuracy and performance never before available in a portable standard.
The RD-31 utilizes Radian’s new Dytronic measurement technology consisting of a Radian designed Integrating Analog to Digital Signal Converter. Unlike off-the-shelf A/D Converters used in other instruments, Radian’s A/D Converter is specifically designed and optimized for power and energy measurement. This unique design makes the RD-31 absolutely unsurpassed in its ability to accurately measure “real world” waveforms. The RD-31’s A/D Converter is combined with Radian’s renowned electronically compensated voltage and current input transformers and a hermetically sealed reference set to provide the highest degree of accuracy, stability and versatility offered in a portable three-phase standard.
MEASUREMENTS
The RD-31 is a four quadrant three-phase measuring instrument that registers both forward and reverse energy flow and provides per phase voltage, current, power and energy (Active, Reactive, Apparent) information.
ANALOG SENSE
The optional analog sense feature enables testing of transducers and electronic energy meters that provide an analog current output from zero to 2 mA.
METER AND STANDARD TESTING
The RD-31 can be used with a controlled current source to test revenue meters and reference standards. In field applications the RD-31 can perform a true three phase meter accuracy test using existing service load. Pickups to sense meter disk rotation or calibration pulses of infrared, visible light or KYZ variety plug directly into the unit. The RD-31 is ideal for testing high end energy meters found in power plants, substations, inter-tie points and at large utility customer accounts. The RD-31 is also the perfect complement to relay test sets where it can serve as an active reference standard when testing meters or can be used to periodically certify the accuracy of the test set itself.
Technical Data
Package Contents
- RD-31 Standard
- RD-2x and RD-3x Manual CD
- RD-2x and RD-3x Getting Started Guide
- Cables
RD-3X Specifications
Unless stated specifications apply to the Radian Model RD-30, RD-31 and RD33. All accuracy specifications are guaranteed and include traceable accuracy to calibration standards used, 95% confidence level. Specifications are for 365 day calibration interval.
General |
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Operating Range: |
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Current |
0.02 to 120 Amp, (200 Amp optional) |
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Voltage |
30 to 630 Vac (60Hz), 30 to 525 Vac (50Hz) |
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Aux Power |
60 to 630 V (autoranging) |
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Frequency |
45 Hz to 65 Hz |
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PF Accuracy |
Power Factor |
RD-30 |
RD-31 |
RD-33 |
> 0.5 |
0.04 % |
0.02 % |
0.01 % |
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0.04 %/2PF |
0.02 %/2PF |
0.01 %/2PF |
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Harmonic Analysis |
< 64th (bandwidth 10000 Hz) |
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Dimensions: |
5"(127 mm), 17.5" (444.5 mm), 6.25" (158.7 mm) |
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Weight: |
16 lbs (7.2 kg), Shipping weight 28 lbs (12.6 kg) |
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Environment: |
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Operating & Storage Temp. |
-20°C to +70°C |
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Humidity |
0 % to 95 % non condensing |
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Vibration |
All non destructive |
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Safety: |
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Hi-Pot |
2.3 kVrms, 60 Hz for 60 seconds |
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Surge |
IEEE 472 and ANSI 37.90 |
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Fused |
Potential and Auxiliary Input |
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Warm-up: |
15 seconds |
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0.5
Interface |
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Display: |
Touch screen, color back lit LCD |
Communications: |
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Serial Port |
RS -232 |
Sensor Port |
Lemo type |
CT Port |
3 CT Inputs (optional Clamps from Radian) |
Inputs 1,2 & 3: |
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BNC Display gate |
150 Ohm pull up to 5 V, clamped at 5.7 V |
BNC Gate rate |
200 nS pulse width minimum, maximum 20 Hz repetition rate. |
Outputs 1, 2 & 3: |
Programmable KH value |
Current Inputs |
6 mm (<120 Amp), 8 mm (<200 Amp option) |
Aux & Potential Inputs |
4 mm |
Specifications |
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Function |
Reading |
Accuracy (ppm)3 |
Stability |
Cal Unc. |
Temperature Coefficient6 (ppm/°C) |
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RD-30 |
RD-31 |
RD-33 |
RD-30 |
RD-31 |
RD-33 |
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Voltage |
30 V to 630 V5 |
200 |
100 |
50 |
8 |
4 |
2 |
30 |
2.5 |
Current |
1 mA … 10 mA2 |
280 |
140 |
70 |
12 |
6 |
3 |
50 |
2.5 |
10 mA … 200 A |
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Power/Energy 3,4 |
1 mA … 10 mA2 |
400 |
200 |
100 |
16 |
8 |
4 |
80 |
5 |
10 mA … 200 A |
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Power Factor |
> 0.5 |
0.04 % |
0.02 % |
0.01 % |
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0.04%/2PF |
0.02%/2PF |
0.01%/2PF |
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Phase angle |
0° … 360° |
0.012° |
0.006° |
0.003° |
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RD-BR1 Burden & Ratio Analysis Specifications |
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Input Power |
RD Standard connection (Allows 60-600V at Site) |
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Measurement Inputs |
Primary CT Current: |
0.1 – 3000 Amperes, 50 or 60 Hz (using probes) |
Secondary CT Current: |
0.01 – 20 Amperes, 50 or 60 Hz |
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CT Primary Probe Input Voltage: |
3V RMS Max (using RR-CTA1) |
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Probe Scales: |
10mV/A |
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Accuracy |
Dependent on RD standard & clamp-on selected |
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CT Burden Testing |
CT Burden Value: |
0.1, 0.2, 0.5, 1.0,4.0,8.0 Ohms |
Resistive Element Tolerance: |
+/- 1% |
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Insertion Burden: |
+/- 0.04 Ohms |
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Notes:
1TCAL = 23°C
2 20mA/Reading x Accuracy Specification (ppm)
3 Includes variables of Stability, Power Factor, and Traceability Uncertainty
4 (30 V … 630 V) For 
1 second Test
5 Maximum 525 V at 50 Hz
6 Maximum -20 ºC … +70 ºC
Repeatability
RD-31 Menu for Measurements & Functionality
The last three digits determine the model. The first of the last three digits determines the measurement functions. The second digit determines if the unit has a built-in computer, power analysis option and/or analog sense input. The third of the last three digits determines the current input configuration and enclosure type.
| Specifying the first of the last three digits: RD-31-Xxx | |
| MODEL | MEASUREMENT FUNCTIONS |
| RD-31-2xx | Whrs, VARhrs, Volts, Amps, VAhrs, Qhrs, Watts, VARs,VA, Phase Angle, PF, Frequency |
| RD-31-3xx | Whrs, VARhrs, VAhrs, Qhrs, Volts, Amps, Watts, VARs,VA, Vhr, Ahr, V2hr, A2hr, Phase Angle, PF, Frequency Min & Max measurements: All indicating functions |
| RD-31-4xx | Whrs, Volts, Amps, VARhrs, Qhrs, VAhrs, Watts, VARs,VA, Vhr, Ahr, V2hr, A2hr, Phase Angle, PF, Frequency Min & Max: All indicating functions AVG response: VAhrs, VA, Volts, Vhrs, Amps, Ahrs |
| Specifying the second of the last three digits: RD-31-xXx | |
| -x0x | No computer, No power analysis, No analog sense input |
| -x1x | Built-in computer (with color display and WIN CE MobileSuite software) |
| -x2x | Power analysis (Harmonics, Trending and Vector Analysis) |
| -x3x | Built-in computer and Power analysis |
| -x4x | Analog Sense Input (for Volts, Amps, Watts, VARs, VA)(2mA DC max) |
| -x5x | Built-in computer and analog sense input |
| -x6x | Power analysis and analog sense input |
| -x7x | Built-in computer, power analysis and analog sense input |
| Specifying the third of the last three digits: RD-31-xxX | |
| -xx1 | 120 Amp (6mm insert) current inputs, Rack Mount |
| -xx2 | 200 Amp (bolt on) current inputs, Rack Mount |
| -xx3 | 120 Amp (6mm insert) current inputs, Portable |
| -xx4 | 200 Amp (bolt on) current inputs, Portable |
Accessories
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RD-BR1Burden & Ratio Analysis Module |
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RR-PCSuiteTesting and Analysis PC Software |
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RR-1HOptical Pickup |
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RR-KYZPulse Input Adapter with 4-Pin plug |
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RR-DSDisk Sensor |
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RR-KitSoftware for Custom Application Development |
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Cables and Leads
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Current Probes
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