ANSI/NETA ATS-2025 Inspection and Test Procedures

Practice flashcards covering ANSI/NETA ATS-2025 standard for inspection and testing of various electrical power equipment.

What is the first step in the visual and mechanical inspection of circuit switchers?

Compare equipment nameplate data with drawings.

In the absence of manufacturer's published data, which table should be used for torque values of bolted electrical connections in circuit switchers?

Table $100.12$.

What specific pressure must be verified for circuit switcher interrupters?

$\text{SF}_6$ pressure.

According to ANSI/NETA ATS-2025, how should as-found and as-left operation counter readings be documented for circuit switchers?

They should be recorded during the visual and mechanical inspection.

What duration is required for the insulation-resistance test on circuit switcher poles phase-to-ground?

The transcript specifies to follow manufacturer's data or use Table $100.1$, usually requiring a one-minute test for control wiring.

What is the applied potential for an insulation-resistance test on $300$-volt rated cable in circuit switcher control wiring?

$500\text{ volts dc}$.

What is the applied potential for an insulation-resistance test on $600$-volt rated cable in circuit switcher control wiring?

$1000\text{ volts dc}$.

Which optional chemical test is performed on circuit switchers in accordance with Section 9?

A thermographic survey.

What is the criterion for investigating bolted connection resistance values in circuit switchers?

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

How many digits should a circuit switcher operation counter advance per close-open cycle?

The counter shall advance one digit.

What is the minimum acceptable insulation-resistance value for circuit switcher control wiring?

Not less than $2\text{ megohms}$.

If manufacturer's data is absent, which table is used for minimum pickup voltage of circuit switcher trip and close coils?

Table $100.20$.

What must be done for units with solid-state components during control wiring insulation-resistance tests?

Follow the manufacturer’s recommendation.

What does a passed dielectric withstand voltage test on a circuit switcher imply?

No evidence of distress or insulation failure is observed by the end of the total time of voltage application.

What specific type of inspection is required for network protector arc chutes?

Verify that arc chutes are intact.

For network protectors, what should be used to verify maintenance device availability?

Verify that maintenance devices are available for servicing and operating the network protector.

What test is performed on the submersible enclosure of a network protector?

A leak test in accordance with manufacturer’s published data.

What is the test duration for insulation-resistance tests on each pole of a network protector?

One minute.

What ratio must be verified for network protectors in accordance with Section 7.10?

Current transformer ratios.

Which circuit value must be measured for each network protector power fuse?

Resistance.

What is the maximum allowable minimum pickup voltage for a network protector motor control relay?

Not more than $75\text{ percent}$ of rated control circuit voltage.

What is the maximum acceptable motor closing voltage for a network protector?

$75\text{ percent}$ of rated control circuit voltage.

Which relay types are tested under Section 7.9.1?

Electromechanical and Solid-State protective relays.

What must be removed from relay cases during visual inspection?

Shipping restraint material and any foreign material.

What is the purpose of burnishing contacts in electromechanical relays?

To ensure contacts are clean and make good contact.

For the 21 Distance Relay, what must be plotted according to ANSI/NETA ATS-2025?

The impedance circle.

What two points are determined for the 24 Volts/Hertz Relay?

Pickup frequency at rated voltage and pickup frequency at a second voltage level.

What are the 'live' and 'dead' set points determined for a 25 Sync Check Relay?

Live line, live bus, dead line, and dead bus.

For an inverse time 27 Undervoltage Relay, what is determined in addition to pickup/dropout?

Time delay at a second point on the timing curve.

What characterizes the 32 Directional Power Relay test?

Determining the directional unit maximum torque angle and plotting the operating characteristic.

Which test is specific to the 40 Loss of Field Relay to ensure accuracy?

Test for spurious torque.

What is determined for the 46N Negative Sequence Current Relay regarding the (I2)^2t curve?

Verify two points on the $(I_2)^2t$ curve.

For a 47 Phase Sequence Voltage Relay, what is the sudden application voltage for the time delay test?

$120\text{ percent}$ of pickup.

What parameters are determined for a 49T Temperature (RTD) Relay?

Trip resistance and reset resistance.

What is determined for the 50BF Breaker Failure relay?

Current supervision pickup, time delays, and all initiate inputs/used outputs.

How many points on the time-current curve must be tested for a 51 Time Overcurrent Relay?

Two points.

For the 63 Transformer Sudden Pressure Relay, what specific circuit should be verified?

The 63 FPX seal-in circuit.

What is determined for the 79 Reclosing Relay regarding unsuccessful reclosing?

Verify lockout for unsuccessful reclosing.

For the 81 Frequency Relay, what is determined besides set points and time delay?

Undervoltage cutoff.

What is measured for the 85 Pilot Wire Monitor?

Overcurrent pickup, undercurrent pickup, and pilot wire ground pickup level.

Which restraint characteristic must be determined for an 87 Differential Relay?

Harmonic restraint.

What is the requirement for relay spiral springs?

They shall be concentric.

In microprocessor-based relays, what information must be recorded regarding firmware?

Firmware revision and software revision.

What must be uploaded to a microprocessor-based relay during inspection?

The owner-supplied relay settings file.

What action is performed on fault counters and event records after microprocessor relay testing is complete?

Reset all fault counters and delete all event records.

What must be verified for light sensors in Arc Energy Reduction Systems?

Relay light sensor pickup values are above maximum ambient light values.

What is the minimum insulation-resistance requirement for current transformer secondary wiring at $1000\text{ volts dc}$?

The test results shall not be less than values shown in Table $100.5$.

According to IEEE C57.13.1, what test is performed on current transformers used for relaying?

An excitation test.

What standard is used for performing a polarity test on current transformers?

$\text{IEEE C57.13.1}$.

How many grounding points are allowed in current transformer secondary circuits?

Only one grounding point.

At what voltage rating must current transformers begin receiving insulation power-factor tests?

$38\text{ kV}$ and above.

What is the phase angle error tolerance for revenue metering voltage transformers per IEEE C57.13.8.1.1?

$\text{Equal to or less than } \pm 0.9\text{ mrad (three minutes)}$.

What is the ratio error tolerance for revenue metering voltage transformers?

$\pm 0.1\text{ percent}$.

What must be measured for capacitor sections of CCVTs?

Capacitance.

What reduction in voltage is required for a capacitor rated over $600\text{ volts}$ within $5\text{ minutes}$ of disconnection?

Reduced to $50\text{ volts}$.

What is the required discharge time for capacitors rated $600\text{ volts}$ or less to reach $50\text{ volts}$?

$1\text{ minute}$.

For electromechanical metering devices, what must be verified regarding rotating disks?

Freedom of movement, end play, and alignment.

What must be recorded for microprocessor-based metering devices besides model and serial numbers?

Firmware revision, software revision, and rated control voltage.

In step voltage regulators, what is inspected prior to unloading the unit?

The impact recorder.

What is calculated during the insulation-resistance test of step voltage regulator windings?

Polarization index.

At what voltage rating is a power factor test (ASTM D 924) required for regulator insulating liquids?

$46\text{ kV}$ or higher.

What is the tolerance for winding-resistance test values compared to factory values for regulators?

They should not vary by more than $2\text{ percent}$.

What constitutes a pass for the dielectric withstand test on a regulator?

No evidence of distress or insulation failure observed by the end of total voltage application.

What test is performed specifically on vacuum interrupters in load tap-changers?

Magnetron atmospheric condition (MAC) test.

What is the maximum pressure for a vacuum interrupter in the absence of manufacturer data?

$1 \times 10^{-2}\text{ Pa}$.

What is the typical excitation-current pattern for a three-legged core transformer?

Two similar current readings and one lower current reading.

Which NEC article governs grounding system compliance according to Section 7.13?

NFPA 70, Article $250$.

What is the maximum allowable resistance for a grounding electrode in a large industrial system?

$5\text{ ohms}$.

What is the maximum allowable resistance for a generating station ground?

$1\text{ ohm}$ or less.

What point-to-point resistance value in a grounding system requires investigation?

Values that exceed $0.5\text{ ohm}$.

In low-voltage ground-fault systems, what must be verified regarding phase conductors and sensors?

Verify that all phase conductors and the neutral pass through the sensor in the same direction.

What is the minimum system neutral-to-ground insulation resistance for ground-fault systems?

$1\text{ megohm}$.

What is the maximum allowable time delay for a ground fault protective device at $3000\text{ amperes}$?

$1\text{ second}$ per NFPA 70 Article $230.95$.

For rotating machinery larger than $200\text{ HP}$, what is the duration of the insulation-resistance test?

$10\text{ minutes}$.

What is the minimum polarization index value for AC induction motors?

$2.0$.

What is the calculated ratio for machines $200\text{ HP}$ and less during an insulation test?

Dielectric-absorption ratio ($60/30\text{ second}$ periods).

What is the minimum dielectric absorption ratio for rotating machinery?

$1.4$.

Which analysis is performed on a running machine under load to detect cracked rotor bars?

Current signature analysis.

At what sideband magnitude in a current signature analysis is a broken bar indicated?

Magnitudes less than $40\text{ dB}$ from the power frequency.

In synchronous motors, what test is performed on all rotating field poles?

An AC voltage-drop test.

What is the allowable variance between poles in a synchronous motor pole-to-pole AC voltage drop test?

Not to exceed $10\text{ percent}$ variance.

What is determined by recording stator current and voltage during the acceleration period of a synchronous motor?

Locked-rotor current and acceleration time to near synchronous speed.

What is the purpose of a V-curve plot for a synchronous motor?

To check correct exciter operation by plotting stator current versus excitation current.

For DC motors, what is the investigative threshold for commutator bar-to-bar resistance deviation?

Greater than $5\text{ percent}$.

What must be checked for DC motors having both shunt and series field windings?

Relative polarity must be checked and leads marked.

What is verified for motor starters regarding contact gap and wipe?

That they are in accordance with manufacturer’s published data.

What specific test is performed on vacuum interrupters for medium-voltage motor starters?

Vacuum bottle integrity test (dielectric withstand voltage).

What is the required insulation-resistance value for motor control wiring?

Not less than $2\text{ megohms}$.

In adjustable speed drive systems, what is compared with motor full-load current to verify settings?

Drive overcurrent setpoints.

What percentage of rated control circuit voltage is required for reduced control voltage tripping in AC systems?

$55\text{ percent}$.

For DC ground-fault systems, what is the required reduced control voltage tripping capability?

$80\text{ percent}$.

What electrolyte measurement is taken for flooded lead-acid batteries?

Specific gravity and temperature.

What is the allowable variance in cell voltages for a battery in float mode?

Within $0.05\text{ volt}$ of each other.

What is the investigative threshold for battery cell internal ohmic values?

Variation by more than $25\text{ percent}$ between identical cells.

For VRLA batteries, where is the temperature measured during electrical tests?

The negative post.

What is measured and recorded regarding the AC component on a DC battery charger?

AC ripple current and voltage.

For low-voltage surge protective devices, how should the ground lead be attached?

With the shortest wire length possible.

What specific electrical test is performed on substation class surge arresters?

A watts-loss test.

Under Section 7.20.1, what must be measured for internal discharge resistors in capacitors?

Resistance.

What is the winding-resistance tolerance for dry-type reactors compared to factory results?

Within $1\text{ percent}$.