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  505 CT Tester
 
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RD-33



Features



Measurement

The 505 Transformer Analyzer measures current transformer (CT) admittance, CT ratio, CT primary-to-secondary phase angle and the voltage, current and phase angle of the service. With the ‘Burden CT/PT Option’, it determines the CT secondary burden capability, the regulation of the potential transformer (PT) and its secondary burden capability and provides for CT core demagnetization.



Testing

The CT Admittance Test feature provides the capability of testing a CT with or without secondary current flow. The CT Ratio Test feature provides for measuring the CT ratio as an ‘Actual’ ratio or a ‘Best Fit’ ratio. CT or PT Burden Tests can be performed using two methods. The first method allows the user to add an individual burden to the secondary. The second method allows the user to add a complete sequence of burdens to the secondary.



Overview



The MODEL 505 Transformer Analyzer is designed for testing current transformers (CT) and potential transformers (PT) without interruption of the customer’s service.  This instrument measures CT admittance, CT ratio, CT primary-to-secondary phase angle and the voltage, current and phase angle of the service. With the ‘Burden CT/PT Option’, it determines the CT secondary burden capability, the regulation of the PT and its secondary burden capability and provides for CT core demagnetization.
 


The CT Admittance Test feature provides the capability of testing a CT with or without secondary current flow. It displays the admittance value of the CT loop which can be recorded and used as a reference value on future tests. Shorted turns, circuit shunts, minor deterioration in CT performance, defective watthour meter current coils, defective test switches, and high resistance connections are easily detected from the admittance value.
 


The CT Ratio Test feature provides for measuring the CT ratio as an ‘Actual’ ratio or a ‘Best Fit’ ratio. If the CT/PT Burden option is installed, ratios can be measured with and without burden applied. In addition, the phase angle between the primary and secondary is measured.



CT or PT Burden Tests can be performed using two methods. The first method allows the user to add an individual burden to the secondary. The second method allows the user to add a complete sequence of burdens to the secondary. The on-board microcontroller automatically applies the burden for 1 second to prevent resistive element burnout. The display provides for the recall of test values for each burden applied.  The Before Burden, and After Burden currents are displayed together with the Percent (%) of change between Before and After Burden readings.



The measurement technique of the 505 eliminates the uncertainty of burden testing in services where continuous current changes are present. It reduces the interpretative requirements of the user since the reduction of CT secondary loop current due to the addition of the selected burden is displayed as a % of the original current. This new measurement method can respond to CT secondary loop currents as low as 0.2 amperes.  When performing PT burden testing, both of the test methods can be performed with and without the meter voltage coil attached to the PT secondary.



A CT Demagnetization, or demag, can be done easily if the CT has at least 2.5 amperes in the secondary loop.  A quick demag test on a CT that is saturated can save time and money by preventing the uneccesary change out of a good CT.  This function applies a series of resistances in a smooth fashion from 0.1 ohm to 8 ohms and back down to 0.1 ohm again to the CT secondary loop. This over burden applied should drive the CT over the knee of the Bh curve (saturating the CT) and demagnetize the core. 



Data collected during the test may be saved.  Test records can be stored and downloaded to software provided for viewing and exporting the saved test results. Saved data may also be recalled for viewing from the 505.
 


The Model 505 Transformer Analyzer is the ultimate answer to in service CT and PT Testing!



Technical Data



Input Power

Service Voltage 10 – 530 VAC (600 VAC max.)
- OR -  
Internal Battery Pack Rechargeable (from service voltage or wall) Ni-Cad battery pack.  Auto power off when unit is idle.
 

Measurement Inputs

Service Voltage 10 – 530 VAC (600 VAC max.)
Primary CT Current 10 – 3000 Amperes, 50 or 60 Hz (using probes; see below)
Secondary CT Current 0.1 – 20 AAC, 50 or 60 Hz (25 AAC max.)
CT Primary Probe Input Voltage 3 VAC max.

CT Primary Probe Scales

1 mV/A, 2 mV/A, 5 mV/A, 10 mV/A,100 mV/A and 1000 mV/A

   

Measurement Resolution

Display 4 line, 40 Character Backlit LCD
Voltage

± 0.1V

Primary CT Current

± 0.1A

Secondary CT Current

± 0.01A

Admittance

± 0.01mS

Phase Angle 0 - 360º, ± 0.1º
Actual Ratio 999.99:5, ± 0.01
Best Fit Ratio 999.99:5, ± 1
   

Measurement Accuracy

Voltage ± 1.0% F.S.
Current ± 1.0% F.S.
Phase Angle ± 1.0º
   

CT Admittance Testing

Test Frequency 1575Hz
Measurement Ranges 0-1mS; 1-10mS; and 10-125mS (Auto ranging)
Insertion Burden 0.14 Ohms
Measurement Accuracy ±5% F.S.
   

Note: The presence or absence of AC current in the CT primary is unlikely to affect the admittance readings by more than ± 1.5% of F.S. value.

   

CT & PT Burden Testing

CT Burden Values 0.1, 0.2, 0.5, 1.0, 2.0, 4.0 and 8.0 Ohms
PT Burden Values 25, 50, 75, 100, 125, 150 and 175 VA
PT Secondary Voltage 10 - 135 VAC (140 VAC max.)

Measurement Accuracy with Burden Added

± 2% F.S.
Resistive Element Tolerance ± 5%
Insertion Burden ± 0.04 Ohms
   

CT Demagnetization

Demag Burden 8 Ohms max.


Memory

Flash Type - New Firmware can be installed without unit return



Temperature

Operating: 0°C to +50°C, Storage -20°C to +70°C.

Humidity: 10 to 95% non-condensing @35°C



Case

Black ABS case with carry handle.  Polycarbonate overlayed control panel.

Size: Approximately 10.00” (25.4 cm) L X 7.50” (19 cm) W x 8.50” (21.6 cm) H

Weight: Approximately 16 lbs. (7.3 Kg) with CT/PT Burden Option
Approximately 13 lbs. (5.9 Kg) without CT/PT Burden Option

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Warranty

Two year limited warranty, excluding battery pack.  Extended Warranty available.



Accessories



505-02 CT Test Leads  
505-03 CT Test Leads  
Model 3000 Rope CT  
MR521 Current Probe  
LW2000-15 AC Current Probe  
LW2000-16 AC Current Probe  

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