Doble Test Modes

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Apparatus Maintenance and Power Management for Energy Delivery

Test Modes of Doble Test Equipment

Five Pieces of Information 1) Current 2) Watts Loss

3) Power Factor 4) Capacitance 5) Power Factor Vs. Voltage Characteristic Knowledge Is Power

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Apparatus Maintenance and Power Management for Energy Delivery

Basic Laws of Electricity •A Difference in Potential Must Exist Between Two Points in order for current to flow •Current Always Returns to It’s Source! •Current Always Takes the Path of Least Resistance

Knowledge Is Power

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Apparatus Maintenance and Power Management for Energy Delivery

Components of Simplified Test Circuits •Power Source •Current & Loss Meter •High-Voltage Test Cable •Low-Voltage Test Lead •Insulation Specimen •Test Ground •Test Set Operation is Based on the Relative Positions of the Power Source, Current & Loss Meter, and the Insulation Specimen With Respect to the Various Test Leads and Ground. Knowledge Is Power

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Apparatus Maintenance and Power Management for Energy Delivery

Basic Test Circuits •GST - Ground •GST - Guard •UST •GST - Grounded-Specimen Test •The Grounded Specimen Tests Measures Current Flowing to Ground via Meter Circuit •UST - Ungrounded Specimen Test •The Ungrounded Specimen Test Measures Current Flowing to an Ungrounded (Floating) Meter Circuit Knowledge Is Power

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Apparatus Maintenance and Power Management for Energy Delivery

Simplified Doble Test Circuit

Knowledge Is Power

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Apparatus Maintenance and Power Management for Energy Delivery

Simplified Doble Test Circuit

Grounded-Specimen Test Mode (GST-Ground) Knowledge Is Power

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Apparatus Maintenance and Power Management for Energy Delivery

Simplified Doble Test Circuit

Grounded-Specimen Test Mode (GST-Guard) Knowledge Is Power

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Apparatus Maintenance and Power Management for Energy Delivery

Simplified Doble Test Circuit

Ungrounded Specimen Test Mode (UST) Knowledge Is Power

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Apparatus Maintenance and Power Management for Energy Delivery

C2

Test Set GST-Gnd

Ground Lead

C1

C3 Ground

Low Voltage Lead

HV Cable

Test Set GST-Guard

C2

Test Set UST

Gu ard

Ground Lead

C1

Low Voltage Lead Current & Loss Meter

C3 Ground

Ground Lead

C2

C1

C3 Ground

Simplified Doble Test Circuit

IA

IA + IB

Knowledge Is Power

SM

Apparatus Maintenance and Power Management for Energy Delivery

IB

Simplified Doble Test Circuit

IA

IA

Knowledge Is Power

SM

Apparatus Maintenance and Power Management for Energy Delivery

IB

Simplified Doble Test Circuit

IA

IB

Knowledge Is Power

SM

Apparatus Maintenance and Power Management for Energy Delivery

IB

Doble Test Circuit HV Cable

IA GST-Ground Red Blue CA

IB

CB

IC CC

High-Voltage Transformer Blue LV Lead

Red LV Lead IA+IB+IC

GUARD Current & Loss Meter

Knowledge Is Power

SM

Apparatus Maintenance and Power Management for Energy Delivery

Ground Lead

Simplified Doble Test Circuit HV Cable

GST-Guard Red Ground Blue

CA

IA IB

IC

CB

CC

High-Voltage Transformer Red LV Lead Blue LV Lead Measure IB+IC

GUARD Current & Loss Meter

Knowledge Is Power

SM

Apparatus Maintenance and Power Management for Energy Delivery

Ground Lead

Simplified Doble Test Circuit HV Cable

GST-Guard Blue Ground Red

IA CA

IB CB

IC CC

High-Voltage Transformer

Blue LV Lead

Red LV Lead Measure IA+IC GUARD Current & Loss Meter

Knowledge Is Power

SM

Apparatus Maintenance and Power Management for Energy Delivery

Ground Lead

Simplified Doble Test Circuit HV Cable

GST-Guard Red Blue CA High-Voltage Transformer

IA IB

IC

CB

CC

Red LV Lead Blue LV Lead

Measure IC

GUARD Current & Loss Meter

Knowledge Is Power

SM

Apparatus Maintenance and Power Management for Energy Delivery

Ground Lead

Simplified Doble Test Circuit HV Cable

UST-Measure Red Ground Blue

IA CA

IB CB

IC CC

High-Voltage Transformer

Blue LV Lead

Red LV Lead

Measure IA

GUARD METER

Do Not Measure IB+IC Knowledge Is Power

SM

Apparatus Maintenance and Power Management for Energy Delivery

Ground Lead

Simplified Doble Test Circuit HV Cable

UST-Measure Red And Blue

CA

IA IB

IC

CB

CC

High-Voltage Transformer

Blue LV Lead

Red LV Lead

Measure IA+IB

GUARD METER

Do Not Measure IC Knowledge Is Power

SM

Apparatus Maintenance and Power Management for Energy Delivery

Ground Lead

Doble Test Circuit HV Cable

UST-Measure Blue Ground Red

IA CA

IB

CB

IC CC

High-Voltage Transformer

Red LV Lead

Blue LV Lead

Measure IB

GUARD METER

Knowledge Is Power

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Apparatus Maintenance and Power Management for Energy Delivery

Ground Lead

Doble High-Voltage Test Cable Outboard Pothead Ground Terminal Guard Terminal Ground Shell

Guard Shield

High-Voltage Conductor

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Guard-to-Ground High-Voltage-to-Guard Insulating Sleeve Insulating Sleeve

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Apparatus Maintenance and Power Management for Energy Delivery

HighVoltage Test Hook

Connecting The High Voltage Lead: Right Acceptable Spacing Between Guard/Ground Rings on Hook and Porcelain Surface

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Apparatus Maintenance and Power Management for Energy Delivery

Connecting The High Voltage Lead: Wrong Not Enough Space Between Guard/Ground Rings on Hook and Porcelain Surface

Knowledge Is Power

SM

Apparatus Maintenance and Power Management for Energy Delivery