ATTACHMENT B HI-POT TEST SHEET DAG-15.pdf

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J061--FY25: Lake Nona Medium Voltage Repair
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36C24825Q0885
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This document is a Hi-Pot Test Sheet for circuit DAG-15, dated 4/11/2025, detailing electrical cable insulation resistance and high-potential (Hi-Pot) test results for a 4/0 15KV cable. The test results reveal multiple significant findings: before the Hi-Pot test, measurements showed varying insulation resistance levels, with some phases displaying good conditions and others showing leakage or definite defects. During the Hi-Pot test at 15,000 volts, each phase shorting test resulted in a trip, indicating potential electrical system vulnerabilities. After the Hi-Pot test, only the W-E (white-to-earth) phase passed with a 7500 M Ohms reading, while other phases showed lower insulation resistance values, suggesting potential cable or splice degradation that could compromise electrical system reliability.

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PANEL DETAILS

CIRCUIT

DAG -15

CABLE DETAILS

4/0 15KV

CABLE MAKE

DATE

4/11/2025

IR VALUE MEASURMENT

(BEFORE HIPOT)

TEST VOLTAGE DURATION IR VALUE REMARKS

R-E 1000 1 MIN. 52M OHMS BELOW 400

W-E 1000 1 MIN. 11 G OHMS LIMIT OF SCALE

B-E 1000 1 MIN.

176 M OHMS BELOW 400

R-W 1000 1 MIN.

11 G OHMS SHOWS GOOD

W-B 1000 1 MIN. 2.6 G OHMS SHOWS LEAKAGE

B-R 1000 1 MIN.

211 M OHMS SHOWS DEFINAT DEFECT

HIPOT TEST TEST VOLTAGE DURATION LEAKAGE CURRENT

(IN mA)

REMARKS

R- PH SHORTING W-B-E 15,000 1 MIN.

TRIP ON EACH TEST THE HIGH VOLTAGE SUPPLY

W-PH SHORTING B-R-E 15,000 1 MIN.

TRIP TRIPPED BEFORE ANY SHOWN VOLTAGE COULD

B-PH SHORTING R-W-E 15,000 1 MIN. TRIP BE DETECTED BY THE METER

IR VALUE MEASURMENT

(AFTER HIPOT)

TEST VOLTAGE DURATION IR VOLTAGE REMARKS

R-E 5000 1 MIN. 45 M OHMS

W-E 5000 1 MIN. 7500 M OHMS ONLY CABLE TO PASS THIS TEST

B-E 5000 1 MIN. 105 M OHMS

R-W 5000 1 MIN.

W-B 5000 1 MIN.

B-R 5000 1 MIN.

TESTED BY WITNESSED BY

Sheet1

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