ANSI/NETA ATS-2025 Review Flashcards

Practice flashcards for the ANSI/NETA ATS-2025 Standard covering inspection and electrical testing procedures for power equipment.

What is the required test duration for a dielectric withstand voltage test on each bus phase for outdoor bus structures?

The test duration shall be for $1\text{ minute}$.

According to Table 100.12, what should be used for bolt-torque levels in the absence of manufacturer’s published data?

Table 100.12 of the ANSI/NETA ATS-2025 standard.

Bolted connection resistance values for outdoor bus structures should be investigated if they deviate from similar connections by more than what percentage?

Values which deviate by more than $50\text{ percent}$ of the lowest value.

For engine generators, what is the required test duration for insulation-resistance tests on machines larger than $200\text{ horsepower}$ ($150\text{ kilowatts}$)?

Test duration shall be $10\text{ minutes}$.

What is the required minimum polarization index value for engine generators according to Section 7.22.1.D.1.1?

The polarization index value shall not be less than $2.0$.

For machines $200\text{ horsepower}$ or less, what is the required duration for the insulation-resistance test?

Test duration shall be $1\text{ minute}$.

What calculation is required for engine generators of $200\text{ horsepower}$ or less during insulation-resistance testing?

Calculate the dielectric-absorption ratio.

What NFPA standard governs the performance testing of emergency engine generator systems?

NFPA 110.

What is the recommended minimum dielectric absorption ratio for an engine generator?

The dielectric absorption ratio shall be greater than $1.0$.

What instrument is used to perform resistance measurements through bolted connections?

A low-resistance ohmmeter.

In a UPS system, where should the DC undervoltage trip level be set for the inverter input breaker?

Set according to manufacturer’s published data.

During a UPS electrical test, how should static transfer from inverter to bypass be tested?

Using normal load, if possible.

What is monitored during the test of a UPS system's oscillator?

The free running frequency of the oscillator.

What must be verified regarding the moving current-carrying parts of an automatic transfer switch (ATS)?

Appropriate lubrication on moving current-carrying parts.

What is the applied DC potential for insulation-resistance tests on $600\text{-volt}$ rated control wiring in an ATS?

$1000\text{ volts dc}$.

What is the applied DC potential for insulation-resistance tests on $300\text{-volt}$ rated control wiring in an ATS?

$500\text{ volts dc}$.

What is the minimum allowable insulation-resistance value for control wiring in an automatic transfer switch?

It shall not be less than $2\text{ megohms}$.

What is the required test duration for insulation-resistance tests on the poles of an automatic transfer switch?

$1\text{ minute}$.

Which section of the NETA standard covers the calibration and setting of relays and timers?

Section 7.9.

During the inspection of automation systems, what firmware-related information must be recorded?

Firmware revisions and software revisions.

How should digital outputs be verified in an automation system?

By operating the controlled device.

What check should be performed with the setting engineer for automation devices?

Check for applicable firmware updates and product recalls.

What must be confirmed regarding the date and time on automation devices?

Verify devices display the correct date and time and events are accurately timestamped.

Which ASTM standard is used to test the dielectric breakdown voltage of an insulating liquid sample?

ASTM D 877.

What does the MAC test stand for in the context of vacuum interrupter testing?

Magnetron atmospheric condition test.

In the absence of manufacturer data, what is the maximum allowable pressure for a vacuum interrupter?

Each vacuum interrupter pressure shall not be greater than $1 \times 10^{-2}\text{ Pa}$.

How many orders of magnitude can a vacuum interrupter's pressure deviate from adjacent poles before failing?

It shall not deviate by more than two orders of magnitude.

Which ASTM standard is used for sampling insulating liquid?

ASTM D 923.

What is the required current level used to test a sectionalizer counting function?

Simulated fault current greater than $160\text{ percent}$ of continuous current rating.

What does the operations counter of an oil sectionalizer indicate per close-open cycle?

It shall advance one digit per cycle.

What instrument is used to perform fiber fracture and construction defect inspection in fiber-optic cables?

An optical time domain reflectometer (OTDR).

In fiber-optic testing, what unit is used to express attenuation loss measurements?

$\text{dB/km}$.

What must be verified regarding visible cable bends in fiber-optic cables?

They must not be less than the manufacturer’s minimum allowable bending radius.

For Electric Vehicle Charging Systems (EVCS), what is the investigation threshold for protective conductor resistance?

Resistance values that exceed $0.5\text{ ohms}$.

List two specific pilot signals tested in EV charging systems.

Proximity pilot and Control pilot.

What safety verification is required for the battery area of a Battery Energy Storage System (BESS)?

Verify that battery area fire suppression equipment is installed.

At what point should power quality measurements be performed during the start-up of a BESS?

At the point of medium voltage interconnection.

What IEEE standard is used for power quality results comparison in BESS?

IEEE 1547.

In PV systems, which components require polarity tests?

Individual cables and PV string combiner boxes.

What specific performance test is mandatory for PV arrays in accordance with manufacturer data?

I-V curve measurements.

What are the two types of insulation resistance tests performed on PV strings?

Dry insulation resistance and Wet insulation resistance.

What is the purpose of system function tests according to Section 8?

To prove the correct interaction of all sensing, processing, and action devices.

What imaging capability is required for equipment used in thermographic surveys?

Capable of detecting a minimum temperature difference of $1^{\text{o}}\text{ C}$ at $30^{\text{o}}\text{ C}$.

When should a follow-up thermographic survey be performed after final acceptance?

Within $12\text{ months}$ of final acceptance by the owner.

According to Table 100.18, what action is recommended for a temperature rise between similar components of $1^{\text{o}}\text{ C}$ to $3^{\text{o}}\text{ C}$?

Possible deficiency; warrants investigation.

According to Table 100.18, what is the significance of a temperature rise ($\text{ΔT}$) greater than $40^{\text{o}}\text{ C}$ over ambient air?

Major discrepancy; repair immediately.

What is the frequency range for spot measurements of magnetic fields in EMF testing?

$40\text{ to }800\text{ hertz}$.

At what height above the floor are magnetic field spot measurements taken?

One meter.

What is the investigation threshold for magnetic flux densities at a perimeter wall?

Above $3.0\text{ mG}$.

What IEEE standard is the baseline for conducting magnetic field evaluations?

IEEE 644.

How long must a Gaussmeter be positioned to determine temporal variations of magnetic fields?

$24\text{ to }48\text{ hours}$.

Name three sensor technologies for online partial discharge (PD) surveys.

Transient-earth voltage (TEV), High-frequency current transformer (HFCT), and Airborne acoustic.

What does the acronym TEV stand for in PD testing?

Transient-earth voltage.

What does the acronym VIS stand for in PD testing?

Voltage indicator system.

According to Table 100.23.1, what is the action for a TEV signal of $20\text{ to }30\text{ dB}$ with a phase-angle related component?

Locate and repair as soon as practical.

What is the recommended action for an airborne acoustic PD signal showing a phase-related component greater than $6\text{ dB}$?

Locate and repair as soon as possible.

Define the 'As-found' condition.

Condition of the equipment when taken out of service, prior to testing.

Define the 'As-left' condition.

Condition of equipment at the completion of inspection and testing, after any corrective action or design change.

What is the definition of 'Low Voltage' (LV) based on ANSI C84.1?

A class of nominal system voltages $1000\text{ volts}$ or less.

What is the voltage range for 'Medium Voltage' (MV)?

Nominal system voltages greater than $1000\text{ volts}$ and less than $100\text{ kV}$.

What is the voltage range for 'High Voltage' (HV)?

Nominal system voltages equal to or greater than $100\text{ kV}$ and equal to or less than $230\text{ kV}$.

Define the term 'Shall' as used in NETA specifications.

Indicates a mandatory requirement.

Define the term 'Should' as used in NETA specifications.

Indicates that a provision is not mandatory but is recommended as good practice.

What is 'Time-travel analysis' in circuit breaker testing?

The measurement of opening and closing strokes from the initiating signal to the complete at-rest position.

According to Table 100.1, what is the recommended minimum insulation resistance for equipment rated at $1000\text{ volts}$ using a $1000\text{-volt dc}$ test?

$100\text{ megohms}$.

What is the minimum DC test voltage for equipment with a nominal rating of $15,000\text{ volts}$ per Table 100.1?

$2,500\text{ volts}$.

Per Table 100.3, what is the maximum dissipation factor ($20^{\text{o}}\text{ C}$) for a mineral oil liquid-filled power transformer?

$0.5\text{ percent}$.

What is the maximum water content in ppm for new mineral oil in equipment rated above $230\text{ kV}$ (ASTM D1533)?

$10\text{ ppm}$.

What is the minimum dielectric breakdown voltage in kV for silicone insulating liquid in new transformers (ASTM D1816)?

$30\text{ kV}$.

What is the maximum neutralization number for new silicone insulating liquid per Table 100.4.2?

$0.01\text{ mg KOH/g}$.

According to Table 100.5, what is the recommended minimum insulation resistance for a dry transformer with a coil rating greater than $5,000\text{ volts}$?

$25,000\text{ megohms}$.

What is the DC test voltage for a $15\text{ kV}$ extruded dielectric shielded power cable at $100\text{ percent}$ insulation level?

$56\text{ kV}$.

What is the minimum duration for a DC high-potential test on medium-voltage cables?

$15\text{ consecutive minutes}$.

What is the VLF ($0.1\text{ Hz}$) phase-to-ground acceptance test voltage for a $15\text{ kV}$ rated cable system?

$21\text{ kV RMS}$.

According to Table 100.7, what is the maximum trip time at $300\text{ percent}$ current for a $100\text{ ampere}$ frame breaker rated $251-600\text{ V}$?

$160\text{ seconds}$.

What is the high-side tolerance for an electronic trip unit's instantaneous trip setting?

$+30\text{ percent}$.

What is the field test voltage (AC) for an instrument transformer with a BIL of $95\text{ kV}$?

$25.5\text{ kV}$.

According to Table 100.10, what vibration limit grade applies to machines with no special requirements?

Grade 'A'.

What is the recommended minimum insulation resistance at $40^{\text{o}}\text{ C}$ for AC windings built after $1970$ (form-wound coils)?

$100\text{ megohms}$.

What is the bolt torque for a $1/2\text{-inch}$ SAE Grade $5$ steel bolt (cadmium or zinc plated)?

$48\text{ pound-feet}$.

What is the nonlubricated torque value for a $1/2\text{-inch}$ silicon bronze fastener?

$40\text{ pound-feet}$.

What is the minimum purity requirement for SF6 gas by volume per Table 100.13?

Greater than $98.5\text{ percent}$.

What is the maximum SO2 decomposition product limit for SF6 gas?

Less than $5\text{ ppmv}$.

What temperature is Table 100.14.1 used to correct insulation resistance values to?

$20^{\text{o}}\text{ C}$.

A resistance test on solid insulation at $35^{\text{o}}\text{ C}$ uses what multiplier to correct to $20^{\text{o}}\text{ C}$ per Table 100.14.1?

A multiplier of $2.00$.

What is the maximum field applied AC test voltage for a recloser in the $14.4\text{ kV}$ nominal voltage class with a $95\text{ kV}$ BIL?

$35\text{ kV}$.

Per Table 100.17, what is the maximum AC test voltage for isolated phase generator lead bus rated at $24.5\text{ kV}$?

$37.0\text{ kV}$.

What is the maximum field applied DC test voltage for an insulation class of $15.0\text{ kV}$ per Table 100.19?

$28.8\text{ kV}$.

For a $125\text{ V dc}$ rated control voltage, what is the DC voltage range for circuit breaker opening functions?

$70 \text{ to } 140\text{ volts dc}$.

What is the recommended DC voltage range for solar PV dry insulation-resistance tests if manufacturer data is missing?

Table 100.1.

What is the minimum bending radius for a single-conductor shielded cable?

$12 \times \text{overall diameter}$.

What is the minimum bending radius for an interlocked armor nonshielded cable?

$7 \times \text{overall diameter}$.

Define 'Extra-high voltage' (EHV).

Nominal system voltages greater than $230\text{ kV}$ but less than $1000\text{ kV}$.

Define 'Ultra-high voltage' (UHV).

Nominal system voltages equal to or greater than $1000\text{ kV}$.

According to Appendix B, what is the recommended test for a 'High' reliability MV Tape Shield cable?

$60\text{ min VLF Monitored withstand}$ and $Diagnostic TD with Tip-Up$.

At what frequency should tan-delta analysis be performed?

$0.1\text{ Hz}$.

What does the 'As-left' value refer to in testing results?

Test values obtained after any corrective action or design change has been performed.

What constitutes 'Extruded Dielectric Insulation' for cables?

Insulation such as PE, XLPE, TRXLPE, or EPR applied using an extrusion process.

What constitutes 'Laminated Dielectric Insulation' for cables?

Insulation formed in layers, typically fluid-impregnated tapes like PILC or MIND.

In Table 100.23.2, what is the recommended action for an HFCT signal greater than $500\text{ pC}$ with a phase related component?

Locate and repair as soon as possible.