Product Highlights
The admittance test injects a small audio-frequency signal into the CT secondary loop and reads the result, with or without secondary current flowing. Record the value as a baseline for future tests. Shorted turns, circuit shunts, partial bypass of primary current, defective meter current coils or test switches, and high-resistance connections all show up in the admittance reading.
CT ratio is measured as an actual or a best-fit ratio, using clip-on probes on the primary from 10 to 3,000 A. With the burden option, the 505 samples the secondary current before and after each burden, displays the percent change, and works with secondary currents as low as 0.2 A. Up to 13 site test records can be stored and downloaded.
Features
- CT admittance testing, with or without secondary current, to find shorted turns, shunts, and high-resistance connections.
- CT ratio (actual or best fit) and primary-to-secondary phase angle, with clip-on primary probes from 10 to 3,000 A.
- Service measurements: 10–530 V, 0.1–25 A, and phase angle from 0 to 360°.
- Optional CT/PT Burden package: ANSI CT burdens of 0.1–8.0 ohms, PT burdens of 25–175 VA, PT regulation, and CT core demagnetization.
- Stores up to 13 site test records, with software for viewing and exporting results.
- Rechargeable battery or line power from 80–530 V service, with a backlit four-line display.
Uninterrupted Service CT/PT Testing
- Connect the 505 to the CT secondary loop and the service voltage, and clip the probe on the primary for ratio testing.
- Check admittance and compare it with the baseline from earlier tests to spot shorted turns, shunts, or poor connections.
- Measure ratio and phase angle between the primary and secondary.
- Run burden tests with the optional package, then save the site record for download.
Which UTEC CT Tester Fits the Job?
Both UTEC testers check CTs in service, without interrupting the customer. The UTEC 585 is a handheld burden tester for fast checks. The UTEC 505 adds CT admittance, ratio, and phase angle testing, plus optional CT and PT burden testing and CT demagnetization.
For complete meter site analysis that includes CT and PT testing, see the RADIAN RW-30X and RW-31X or the Powermetrix 6618A.
| UTEC 585 | UTEC 505 | |
|---|---|---|
| Tests | CT burden | CT admittance, ratio, and phase angle; service voltage, current, and phase angle; CT and PT burden and CT demagnetization (option) |
| Current | 0.1–20 A secondary | 0.1–25 A secondary; 10–3,000 A primary with clip-on probes |
| Burdens | ANSI 0.1–8.0 ohms, combinable up to 15.8 ohms | ANSI 0.1–8.0 ohms; PT burdens 25–175 VA (option) |
| Power | Six AA batteries | Rechargeable battery or line power |
| Data | Before, after, and percent change on screen | Stores 13 site test records for download |
| Best for | Quick burden checks at the test switch | Complete in-service CT and PT analysis |
UTEC 505 FAQ
What is CT admittance testing
The 505 injects a small audio-frequency signal into the CT secondary loop and measures the induced current to find the loop's admittance. Compared against a baseline, the reading reveals shorted turns, circuit shunts, partial bypass of primary current, defective meter current coils or test switches, and high-resistance connections.
Can the 505 test CTs without interrupting service
Yes. The 505 tests CTs and PTs in service, so the customer stays powered during the test. Admittance can be measured with or without secondary current flowing.
What does the CT/PT Burden option add
The option adds CT burden testing with ANSI burdens of 0.1–8.0 ohms, PT burden testing from 25 to 175 VA, PT regulation, and CT core demagnetization. It can be added to an existing 505, but the unit must return to the factory for installation.
How is CT ratio measured
Clip-on probes measure the primary current from 10 to 3,000 A, and the 505 compares it with the secondary current to show an actual or best-fit ratio and the primary-to-secondary phase angle. With the burden option, ratio can be measured with and without burden applied.
When is the UTEC 585 enough
If you only need to confirm a CT holds its output under added burden, the handheld UTEC 585 CT Burden Tester does that quickly at the test switch, on AA batteries.
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