Feichun Cable · cable-system commissioning engineering
What Acceptance Criteria or Pass/Fail Thresholds Are Commonly Used for Partial Discharge Measurements on New Cable Installations?
There is no technically defensible universal picocoulomb limit for every newly installed cable circuit. A sound acceptance specification combines a successful withstand test, a stated test waveform and voltage, demonstrated end-to-end detection sensitivity, rejection of external interference, source localization, PD inception and extinction behavior, phase-resolved pattern analysis, and an explicit decision rule for the cable, joints and terminations.
IEEE 400.3-2022IEC 60270:2025PDIV / PDEVApparent chargeLocalizationPRPDPass / Hold / FailCommissioning baseline
Direct answer: use a multi-parameter acceptance envelope, not a universal pC number
For a new installed cable system, the most common defensible criterion is: no repeatable, defect-related, localized partial discharge attributable to the cable, a joint or a termination at the specified commissioning voltage, above a detection sensitivity that has been demonstrated for the relevant location. PD that persists at or below normal phase-to-ground operating voltage U0 is normally a reject or rework condition.
PASS
Withstand completed; sensitivity demonstrated; no repeatable localized defect PD at the required voltage; no PD remains at U0 on the descending voltage step.
HOLD
Source is weak, intermittent, only above U0, not localized, or masked by noise. Perform source separation, repeat testing or an agreed complementary diagnostic.
FAIL
Repeatable internal or accessory PD is localized at or below U0, PDEV is at or below U0, activity grows materially with voltage, or the withstand test fails.
INVALID
The required sensitivity cannot be demonstrated, background exceeds the criterion, calibration is incomplete, or the test waveform differs from the approved procedure.
Do not write “PD shall be below 10 pC” by itself. Without voltage, waveform, bandwidth, calibration method, background level, cable length, sensor location, source-location rule and treatment of external corona, that sentence is not an auditable acceptance criterion.
Why field measurements do not have one universal picocoulomb threshold
| Variable | Effect on recorded PD | Acceptance implication |
|---|---|---|
| Circuit length | High-frequency pulses attenuate and disperse as they propagate; distant defects may appear smaller. | A terminal sensitivity check does not automatically prove sensitivity at every joint. |
| Accessory interfaces | Impedance changes create reflections and multiple arrivals. | Location algorithms and sensor placement must account for the circuit topology. |
| Measurement bandwidth | IEC 60270 charge-based systems, HFCT/UHF sensors and online monitors observe different spectral content. | Numbers from unlike systems are not directly interchangeable. |
| Voltage waveform | Power-frequency, resonant, VLF and DAC excitation produce different charge dynamics and phase references. | Limits and baselines must be attached to the named method. |
| Background interference | Switching supplies, radio signals, corona, grounding loops and test equipment may imitate PD. | A raw amplitude crossing is not a failure until the source is classified. |
| Defect physics | A small internal void, surface discharge, floating electrode and external corona have different risk. | Pattern, repetition, voltage dependence and location matter as much as qIEC. |
| Temperature and history | Thermal state, voltage dwell and previous overvoltage affect inception and extinction. | Record the sequence and allow the specified stabilization time. |
Apparent charge in pC is a calibrated terminal quantity representing the equivalent charge transfer that would create the observed terminal response. It is not a direct measurement of the microscopic charge inside the defect.
Which standards control the acceptance logic?
| Document | Current public status | Role | What it does not provide |
|---|---|---|---|
| IEEE 400.3-2022 | Active; published 2023 | Guide for online or externally energized field PD detection, measurement and location on installed shielded cable systems, including cable, joints and terminations. | No single universal field pC pass/fail value. |
| IEC 60270:2025 | Edition 4.0 | Charge-based quantities, circuits, frequency ranges, calibration, instruments, procedures and interference discrimination. | No product-independent installed-cable acceptance limit. |
| IEC 60502-2 | 2014+A1:2024 with COR1:2026 | Product requirements for extruded-insulation cables from 6 kV up to 30 kV rated voltage classes. | Factory values are not automatically field thresholds for a complete installed circuit. |
| IEC 60840 | 2020+A1:2023; corrected 2025 | Cable systems above 30 kV up to 150 kV and their accessories. | Does not justify importing a lower-voltage factory threshold without the applicable system procedure. |
| IEC 62067:2022 | Edition 3.0 | Cable systems above 150 kV up to 500 kV and their accessories. | Commissioning remains system- and project-specific. |
| ANSI/NETA ATS-2025 | Current acceptance-testing specification | Framework for suitability for initial energization, with medium-voltage cable acceptance tables and reliability guidance. | Its public scope does not establish one universal PD amplitude. |
| IEEE 400.4 | DAC field-testing guide under revision | Framework for damped AC field testing and PD diagnostics. | Results must remain tied to the DAC waveform and procedure. |
Figure 1 — How factory evidence, field measurement conditions and the acceptance decision fit together.
Factory limits versus field acceptance: the numbers engineers often confuse
| Context | Commonly referenced value | Proper engineering use | Misuse to avoid |
|---|---|---|---|
| IEC 60502-2 routine cable test | Less than 10 pC at 1.73 U0 | Factory routine benchmark on a defined cable specimen using the prescribed measurement method. | Do not automatically apply it at one end of a long installed circuit. |
| IEC 60502-2 type-test sequence | 5 pC reference level at 1.73 U0 | Factory type-test reference associated with the specified sequence and specimen. | Do not present it as a universal commissioning limit. |
| Accessory design/production tests | Low-pC limits and specified extinction voltage are common in applicable joint and termination standards. | Use the exact accessory standard, voltage class, edition and approved drawing. | Do not quote a generic accessory number without the applicable document. |
| Offline installed-system PD | No universal pC value | Specify absence of localized defect PD above a verified sensitivity at the test voltage, plus PDIV/PDEV and pattern rules. | Do not accept an unlocalized terminal amplitude alone. |
| Online PD survey | No universal pC-equivalent value | Use multi-sensor correlation, pattern, location, operating condition and baseline/trend. | Do not compare an HFCT reading directly with an IEC 60270 factory pC number. |
Contract rule: if a project adopts a 10 pC field criterion, the test provider must demonstrate end-to-end detection at or below 10 pC at each relevant evaluation location. If that sensitivity cannot be proven, the numerical criterion is not technically enforceable and the result is invalid—not a pass.
Common acceptance matrix for a new installed cable circuit
| Observation | Typical classification | Engineering rationale | Required action |
|---|---|---|---|
| Withstand completed; required sensitivity demonstrated; no localized defect activity at the specified voltage | PASS | Electrical strength and PD diagnostic conditions both meet the approved procedure. | Save raw data and establish the commissioning baseline. |
| No PD on the descending step at U0; any prior activity is confirmed as external corona | PASS | Source attribution prevents external interference being mistaken for insulation PD. | Document evidence used for classification. |
| Repeatable cable/accessory PD begins or persists at or below U0 | FAIL / REWORK | The defect is active under normal electrical stress. | Localize, inspect, repair or replace, then repeat the full agreed test. |
| PDEV is at or below U0 | FAIL / REWORK | Once initiated, discharge remains active at normal operating voltage. | Do not energize until disposition is approved. |
| Localized activity only above U0, weak but repeatable | HOLD / ENGINEERING REVIEW | It may reveal a defect with operating margin, but risk depends on voltage, type and growth behavior. | Apply the project’s required PDEV margin and defect-specific rules. |
| Unlocalized activity or conflicting sensor locations | HOLD | Defect attribution is incomplete. | Reconfigure sensors, perform time-of-flight analysis or use complementary detection. |
| Background noise is above the contractual threshold | INVALID TEST | Absence of recorded PD cannot prove absence of detectable PD. | Reduce noise, change timing/location/bandwidth, or reschedule. |
| Calibration pulse is visible at the near end but not verified across the circuit | INVALID FOR REMOTE POINTS | Long-cable attenuation can hide a distant defect. | Verify at relevant joints/ends or model and validate the transfer function. |
| Breakdown, flashover or protective trip during withstand | FAIL | The circuit did not withstand the approved test stress. | Investigate and repair before any repeat test. |
PDIV and PDEV often carry more risk information than qmax
Partial-discharge inception voltage (PDIV) is the increasing-voltage level at which specified, repeatable PD first appears. Partial-discharge extinction voltage (PDEV) is the decreasing-voltage level below which that activity ceases. Because many defects exhibit hysteresis, PDEV is normally the more direct question for operating risk.
| Finding | Interpretation | Typical disposition |
|---|---|---|
| No PD through the specified test voltage | Best outcome, provided sensitivity and noise requirements were satisfied. | Pass. |
| PDIV > U0, PDEV > U0 | Activity exists only above normal stress; the margin may or may not meet the project requirement. | Review against specified margin and defect type. |
| PDIV > U0, PDEV ≤ U0 | Overvoltage can trigger activity that remains active at normal stress. | Reject or rework. |
| PDIV ≤ U0 | Defect is capable of initiating during normal operation. | Reject or rework. |
| PDIV/PDEV cannot be determined because of noise | The voltage threshold is not measurable. | Invalid; improve the test condition. |
Some project programs require PDEV above a contractual margin such as 1.3 U0 or 1.5 U0. Such a margin can be conservative and useful, but it must be identified as a project or component-specific requirement—not attributed as a universal IEEE 400.3 threshold.
Figure 2 — A controlled up/down voltage sequence reveals inception, extinction and phase-resolved behavior.
Detection sensitivity is part of the acceptance criterion
| Requirement | Engineering purpose | Evidence in report |
|---|---|---|
| Known calibrator or reference pulse | Checks measurement-chain response and scaling. | Calibrator identity, charge setting, validity and connection point. |
| Relevant injection location | Tests the propagation path from a potential defect to the sensor. | Near end, far end and accessible joint locations as required. |
| End-to-end visibility | Proves the contractual threshold is detectable after attenuation. | Signal-to-noise ratio and recovered magnitude at each channel. |
| Frequency response | Documents how the selected bandwidth changes pulse amplitude and shape. | Filter settings, bandwidth, coupling device and sensor transfer data. |
| Background before and during energization | Separates ambient noise, source noise and voltage-dependent events. | Noise floor at each voltage step and with source energized/de-energized. |
| Timing synchronization | Enables time-of-flight location and phase-resolved mapping. | Clock reference, phase reference and channel timing verification. |
| Repeatability check | Detects unstable wiring, grounding or processing artifacts. | Repeated calibration response before and after the test. |
Calibration boundary: injecting a charge at one terminal calibrates the response at that injection point. It does not recreate every defect pulse spectrum and does not prove the same apparent-charge sensitivity at a remote joint unless the propagation path is verified.
External corona and electromagnetic noise must not become false failures
| Possible source | Useful evidence | Typical response |
|---|---|---|
| Internal insulation void | Stable bipolar phase windows, voltage dependence, repeated location inside cable/accessory. | Defect-related; disposition by PDIV/PDEV, level and location. |
| Surface discharge at termination | Pattern changes with humidity/cleaning; optical or acoustic correlation near stress-control surface. | Inspect assembly, contamination, clearance and stress cone. |
| External corona | Localized in air near exposed energized hardware; often unipolar pattern and sensitive to geometry. | Correct test setup or document exclusion from cable-system PD. |
| Floating metal | Distinct repetitive pattern; may change when bonding or mechanical contact changes. | Inspect shields, grounds, screens and test connections. |
| Switching or radio interference | Appears on reference antenna or multiple unrelated channels; not tied consistently to test voltage. | Use time gating, correlation and narrower justified bandwidth. |
| Test-source discharge | Appears with source energized before the cable is connected or follows source-side sensor. | Repair, shield or reconfigure source before acceptance testing. |
Offline power-frequency, VLF, DAC and online PD are not numerically interchangeable
| Method | Strength | Limitation | Acceptance rule |
|---|---|---|---|
| Power-frequency / resonant AC | Electrical stress and phase behavior are comparatively close to service-frequency conditions. | Equipment size and circuit capacitance can be demanding. | Tie pC, PDIV/PDEV and withstand voltage to the approved resonant setup. |
| VLF sinusoidal | Compact source for long capacitive circuits. | Frequency-dependent charge transport and accessories may respond differently. | Use method-specific voltage, duration and interpretation; do not transplant a factory power-frequency limit. |
| DAC | Useful for PD inception, extinction and location with a decaying oscillatory waveform. | Voltage varies during the oscillation; charge estimation and pattern construction are system-specific. | Follow the stated DAC guide/procedure and retain waveform parameters. |
| Online at operating voltage | No outage or external overvoltage; observes real loading and environment. | Highest interference burden and often non-conventional sensors. | Use location, correlation, classification and trend; avoid universal pC-equivalent pass/fail. |
| Monitored withstand | Combines voltage withstand with real-time PD warning and localization. | Requires a predetermined stop rule and trained interpretation. | Define maximum voltage, dwell, alarm/stop criteria and post-test PDEV check. |
Acceptance must identify whether the source is cable, joint or termination
| Component | Typical new-installation defect | PD evidence | Corrective focus |
|---|---|---|---|
| Extruded cable | Contamination, protrusion, insulation void, semiconductive-screen defect or installation damage. | Repeatable location in a cable section; characteristic phase and voltage dependence. | Confirm route damage and manufacturing traceability; replace affected length where required. |
| Premoulded joint | Incorrect positioning, trapped air, contamination, screen cut error or inadequate interface pressure. | Pulse location at joint; possible surface/interface pattern. | Open under controlled procedure, inspect workmanship and install a new approved kit. |
| Heat-shrink or cold-shrink joint | Moisture, wrinkles, incorrect overlap, voids or poor stress-control geometry. | Joint-localized activity with voltage-dependent repetition. | Verify preparation dimensions, environmental controls and installer record. |
| Termination | Stress-cone misplacement, contamination, moisture, inadequate clearance or grounding error. | Electrical PD plus possible acoustic/optical indication near exposed end. | Distinguish internal/interface discharge from external air corona. |
| Bonding link / sheath connection | Floating screen, loose ground, incorrect cross-bonding or test-lead geometry. | Floating-metal patterns or false location caused by reflections. | Correct the bonding system and repeat calibration before retest. |
Figure 3 — Multi-ended or distributed sensing improves source attribution and exposes attenuation at remote accessories.
Long circuits: why the farthest joint may govern test validity
| Risk | Consequence | Mitigation |
|---|---|---|
| Pulse attenuation | A remote defect falls below the noise floor. | Use sensors at both ends or accessible joints; verify transfer sensitivity. |
| Dispersion | Pulse broadens and peak amplitude falls. | Use validated bandwidth and location-dependent correction cautiously. |
| Multiple reflections | A single defect appears at several times or locations. | Build a topology/reflection map before classifying sources. |
| Cross-bonding sections | Bonding hardware changes propagation and sensor response. | Record link-box configuration and use section-specific calibration. |
| Parallel circuits | Coupled pulses may be assigned to the wrong feeder. | Correlate simultaneously across circuits and use reference sensors. |
| Unavailable joints | Direct injection or local sensor placement is impossible. | Document the residual blind zone and obtain owner approval of the limitation. |
Illustrative two-ended location relation
x ≈ (L + v·Δt) / 2
where x = distance from the first synchronized sensor, L = cable-section length,
v = verified propagation velocity, and Δt = difference in first-arrival times.This relation is only as reliable as the topology, synchronization, velocity estimate and first-arrival identification.
Recommended commissioning test sequence
| Step | Action | Acceptance checkpoint |
|---|---|---|
| 1. Document review | Confirm cable and accessory standards, rated voltage, U0, lengths, joint map, bonding, prior factory reports and approved test method. | All identifiers match the installed circuit. |
| 2. Physical inspection | Inspect terminations, grounds, link boxes, phase clearances and test connections. | No visible condition that would invalidate or endanger the test. |
| 3. Background survey | Record sensors with source off, auxiliary systems in relevant states and reference antenna active. | Noise is below or separable from the contractual sensitivity. |
| 4. Calibration/sensitivity | Inject the reference signal at agreed locations and verify every acquisition channel. | End-to-end detection requirement is met. |
| 5. Voltage ramp | Raise voltage in controlled steps with defined dwell, recording q, pulse rate, phase pattern and location. | No stop criterion is crossed. |
| 6. Withstand dwell | Hold the specified voltage and duration while monitoring PD and leakage/protection signals. | Withstand passes and no prohibited localized PD develops. |
| 7. Descending steps | Reduce voltage and identify PDEV, including a dwell at U0. | No defect PD persists at U0; required PDEV margin is met. |
| 8. Post-check | Repeat calibration, confirm instrument state and inspect terminations. | Measurement chain remained valid throughout. |
| 9. Disposition | Classify each source as cable, accessory, external, interference or unresolved. | Pass/Hold/Fail is supported by traceable evidence. |
A practical decision workflow
| Gate | Question | Yes | No |
|---|---|---|---|
| Validity | Was the specified waveform used and was sensitivity demonstrated? | Continue. | Invalid; correct the setup. |
| Withstand | Did the circuit complete the required voltage and duration? | Continue. | Fail and investigate. |
| Source | Is recorded activity repeatable and attributable to the cable system? | Localize and classify. | Document external/noise evidence or hold if unresolved. |
| Operating stress | Does defect PD occur or persist at/below U0? | Fail/rework. | Assess margin above U0. |
| Margin | Does PDEV exceed the project-required margin? | Assess amplitude, pattern and stability. | Hold or fail per specification. |
| Final evidence | Are location, PRPD, voltage history and raw files complete? | Approve pass if all gates meet criteria. | Hold pending a complete record. |
Figure 4 — A numerical amplitude is only one gate in the final decision.
What the final acceptance report must contain
| Category | Required fields | Why it matters |
|---|---|---|
| Asset identity | Circuit ID, cable manufacturer/type, voltage, conductor size, insulation, route length, drum and accessory serial/lot references. | Connects the result to the installed asset. |
| Circuit topology | Lengths, joint positions, terminations, link boxes, grounding and cross-bonding state. | Enables defensible localization and future comparison. |
| Test source | Waveform, frequency, voltage measurement, ramp, dwell, duration and protection/stop settings. | Defines the electrical stress actually applied. |
| Measurement chain | Coupler/sensor, acquisition instrument, bandwidth, filters, gain, sampling and synchronization. | Determines comparability and detection limits. |
| Sensitivity | Calibrator/reference, injection points, recovered signals, noise floor and pre/post verification. | Proves the acceptance threshold was observable. |
| PD data | qIEC or stated alternative unit, pulse rate, PRPD, PDIV, PDEV, location, polarity and time trend at every voltage step. | Supports source classification and risk assessment. |
| Disposition | Each cluster labeled cable, joint, termination, external, interference or unresolved; final Pass/Hold/Fail rationale. | Prevents a single peak value from replacing engineering judgment. |
| Raw evidence | Native data, screenshots, calibration files, photos, environmental conditions and signatures. | Allows independent audit and future baseline comparison. |
Model acceptance clauses for a procurement or commissioning specification
1. Scope
The test shall include the complete installed shielded cable system, including cable sections, joints, terminations and bonding interfaces identified on the approved circuit schedule.2. Method
The approved test waveform, frequency, voltage steps, maximum voltage, dwell and withstand duration shall be stated. Method substitution requires written engineering approval.3. Sensitivity
Before and after voltage application, the contractor shall demonstrate detection of the contractual reference signal at every relevant evaluation location. Failure to demonstrate the required sensitivity makes the result invalid.4. PD acceptance
No repeatable, defect-related and localized PD attributable to the installed cable system shall be present at the specified acceptance voltage above the demonstrated detection sensitivity.5. Operating-voltage rule
Any repeatable cable, joint or termination PD that initiates or persists at or below U₀ shall be classified as nonconforming. PDEV shall exceed U₀ and any additional project margin stated in the data sheet.6. Source discrimination
External corona and electromagnetic interference may be excluded only when supported by phase-resolved, time-correlated, multi-sensor, optical/acoustic or other documented evidence.7. Deliverables
The report shall include PDIV, PDEV, magnitude/unit definition, pulse rate, PRPD, location, voltage history, noise, sensitivity evidence, raw data and disposition of every cluster.8. Retest
After repair or accessory replacement, the entire agreed acceptance sequence shall be repeated and linked to the original nonconformance record.
The owner should add a project-specific PDEV margin, numerical sensitivity target and test-voltage schedule only after confirming the cable class, accessory standards, circuit length, test method and achievable noise floor.
Applying the criteria to high-consequence cable systems
| System | Commissioning risk | PD acceptance emphasis |
|---|---|---|
| Ship-to-shore crane supply | Long feeder routes, vibration, joints near moving structures and high interruption cost. | Joint localization, remote sensitivity, termination corona control and baseline retention. |
| RTG/RMG crane distribution | Power-electronic noise, grounding complexity and compact equipment rooms. | Reference sensors, source separation and simultaneous multi-channel acquisition. |
| Mining equipment feeder | Mechanical damage, moisture, contamination and difficult accessory access. | Pre-test inspection, section-by-section sensitivity and strict PD-at-U0 rejection. |
| Conveyor system | Long distributed routes and many transitions or joints. | Accurate topology, reflection mapping and clear blind-zone disclosure. |
| Industrial process plant | Continuous-process consequences and multiple interference sources. | Coordinated outage, low-noise test window and auditable Hold criteria. |
| Critical auxiliary power | Failure can disable protection, cooling or safe shutdown functions. | Conservative PDEV margin, independent review and complete raw-data archive. |
Feichun Cable engineering and compliance boundary
Engineered for maximum safety in demanding environments, our cable systems comply with global standards including ATEX, IECEx, VDE, CE, UKCA, EAC, and the Russian Fire Safety Certificate. They are the trusted choice for heavy-duty mining equipment, ship-to-shore cranes, RTG/RMG cranes, and conveyor systems where high reliability is non-negotiable.
Certificate applicability must be verified for the exact product, manufacturing site, certificate number, validity period and intended project. A partial-discharge commissioning result evaluates the tested installed insulation system under the stated procedure; it does not by itself establish any listed product or market certification.
Frequently asked questions and RFQ inputs
Is 10 pC the normal field pass limit?
No universal rule makes 10 pC valid for every installed circuit. It can be a contractual limit only when the measurement definition and end-to-end sensitivity at relevant locations are demonstrated.
Does zero displayed pC prove a defect-free circuit?
No. It proves only that the instrument displayed no activity above its effective sensitivity and processing threshold under the test conditions.
Should any PD above U0 fail?
Not automatically. Repeatable localized activity above U0 requires review against the specified PDEV margin, defect type, amplitude, repetition, stability and applied test stress.
What is the clearest failure condition?
Repeatable, localized internal or accessory PD at or below U0, especially when PDEV is at or below U0 or activity grows with voltage.
Can online readings be compared with factory pC?
Usually not directly. Online HFCT or UHF measurements may not satisfy the same apparent-charge definition, bandwidth or calibration geometry as a factory IEC 60270 circuit.
Does a withstand pass override PD findings?
No. Withstand and PD diagnostics answer different questions. A circuit can survive the test duration while containing an active defect that warrants rework.
Minimum PD acceptance RFQ data
Cable system: rated voltage · U₀ · insulation · conductor · screen · length · joint count · termination type
Topology: joint distances · bonding/cross-bonding · link boxes · parallel circuits · accessible sensor points
Test method: power-frequency/resonant · VLF · DAC · online · monitored withstand
Voltage schedule: ramp · steps · dwell · test voltage · duration · descending U₀ dwell
Acceptance: sensitivity target · required locations · PDEV margin · PD-at-U₀ rule · stop criteria
Measurement: IEC 60270 or non-conventional sensor · bandwidth · synchronization · localization method
Environment: temperature · humidity · interference survey · adjacent energized equipment
Documents: factory PD reports · accessory standards · installation records · raw data format · baseline retention
Technical sources and argument support
- IEEE 400.3-2022 — active guide covering online or externally energized PD detection, measurement and location on new or service-aged installed shielded cable systems, including joints and terminations.
- IEC 60270:2025 — current charge-based PD measurement standard covering quantities, circuits, frequency ranges, calibration, instruments, procedure and interference discrimination.
- IEC 60502-2:2014+A1:2024/COR1:2026 — current consolidated/corrected product-standard route for extruded-insulation cables from 6 kV to 30 kV rated voltage classes.
- Technical comparison of IEC 60502-2 and the corresponding VDE cable requirements — concise tabulation supporting the cited 10 pC routine-test and 5 pC type-test reference levels at 1.73 U0; the governing standard remains the controlled IEC text.
- IEC 60840:2020+A1:2023 — cable systems above 30 kV up to 150 kV, with a correction issued in 2025.
- IEC 62067:2022 — cable systems above 150 kV up to 500 kV.
- IEEE 404-2022 and IEEE 48-2020 — test requirements and procedures for shielded cable joints and terminations.
- IEEE 400.4 — field testing of shielded cable systems using damped alternating current.
- ANSI/NETA ATS-2025 — acceptance-testing framework for initial energization, including medium-voltage cable acceptance tables and cable reliability guidance.
- NETA World — Measuring Partial Discharge on Medium-Voltage Cables — practical discussion of test-voltage ranges, PDIV/PDEV and the absence of established universal field thresholds.
- CIGRE Technical Brochure 662 — guidance on conventional and unconventional PD detection and the importance of measurement method, calibration and source discrimination.
This article distinguishes normative product limits from common engineering practice. Standards are copyrighted; the article summarizes public scope and engineering implications rather than reproducing controlled procedures. Test voltage, duration, sensitivity and final acceptance must be established from the applicable full standards, the owner’s specification, manufacturer instructions and the approved cable-system design.
