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DOBLE’S PARTIAL DISCHARGE SOLUTIONS FOR

Rotating Machines

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What is Partial Discharge?Inside all insulation systems exist imperfections known as “voids”.

There can be a number of causes, but in the end these voids actas the catalyst for the creation of partial discharge (PD).

PD is the localized movement of charge that damages surrounding

insulation. Over time this cumulative damage can lead to a failure.

SOLUTIONS FOR ROTATING MACHINES An Introduction to Partial Discharge

www.doble.com

The Doble Approach to Partial Discharge for

Rotating Machines

Phase 1: TESTING

When partial discharge occurs in rotating machines the bars or

coils become loose, resin binders deteriorate, stress relief systems

fail or end windings become cracked or contaminated.

The onset and progress of deterioration can be evaluated via trend

analysis. Periodic on-line testing is performed with Doble’s or other

pre-installed sensors.

Testing solutions are a low-cost introduction to PD testing and can

be used to test multiple machines.

Phase 2: MONITORING

Monitoring is used to assess the condition of insulation over

time to watch the progress of deterioration and plan preventative

action.

Maintenance can be scheduled more accurately to avoid costly

interruptions caused by in-service failures.

Monitoring can be done with Doble’s sensors or other pre-existing

sensors. This offers the highest level of defense for your mostcritical assets.

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Doble’s Experts Can Help By:

• Breaking down and analyzing test data

• Preparing formal reports

• Giving recommendations on next steps if PD is found

Did You Know?

Key ParametersRepetition Rate:

Indication of the overall PD level

Apparent Charge [pC], PD signal [mV]:

Quanties the PD magnitude IEC 60270

Phase Resolved PD (PRPD):

PD analysis that characterizes the cause and severity

These key parameters are supported by International Standards such asIEC 60270.

Partial Discharge Solutions Support and ServicesIt’s not always possible to maintain PD experts on your staff. Rely on Doble’s

engineers for speciality diagnostic testing and advanced engineering support.

Options include Services Agreements for leased and purchased equipment and

expert Consulting and Testing services.

An Introduction to Partial Discharge SOLUTIONS FOR ROTATING MACHINES

www.doble.com

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SOLUTIONS FOR ROTATING MACHINES Testing for Partial Discharge

www.doble.com

Phase 1: Testing for Partial Discharge

PD-Smart

Why test for PD with Doble?

Do you want to get the best value in

test equipment and test a large eet

of machines?

Are you new to PD testing?

Do you want to make a limited initial

investment?

Do you wish to monitor a less critical

rotating machine?

Would like to have the exibility

to test the rotating machine in the

future and just want to install the

couplers and connections now?

The PD-Smart offers advanced partial discharge analysis for stators in

motors, generators and synchronous compensators.

Using permanently installed couplers (Doble’s or pre-existing sensors),

periodically monitor the condition of rotating machines while they

remain in-service.

One device can test all of the winding from end-to-end throughout your

rotating machines.

PD-Smart Features

» Rugged & Portable

» Interference Rejection

» State-of-the-Art Electronics

» Standards ready

» Modular Voltage Options

» Coupling Options

» Scalable

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Testing for Partial Discharge SOLUTIONS FOR ROTATING MACHINES

Signal Splitter

Terminal Box

Noise GatingSensor optional 4th coupler

Motor or

Generator

Buswork

N e u t r a l

Support

LDC-5/S2

Calibrator

FailSafe LF Couplers

& Installation Kits

PD-Smart

Notebook PC

Testing Rotating Machines for Partial Dischargewith the PD-Smart

PD-Smart for Rotating Machines Accessories

A typical PD-Smart testing system consists of:

• 1 PD-Smart with Software and Accessories

• 3 FailSafe / LF Coupler (PDDC-24 or PDDC-17)

4th coupler is an option

• 3 (4) Coupler Installation Kits

• 1 Terminal Box

• 1 Signal Splitter

• 1 External Calibrator

Thanks to the Bus Coupler Matching Unit,

you can use your existing couplers to test

or monitor for partial discharge.

The Bus Coupler Matching Unit will

improve signals from your existing installed

couplers.

This avoids costly outages that would be

necessary to replace the high frequency

couplers with low frequency couplers.

PD Testing With Existing High Frequency Couplers

www.doble.com

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SOLUTIONS FOR ROTATING MACHINES Monitoring for Partial Discharge

www.doble.com

PD-Guard Features

» Highly sensitive PD Detection

» Advanced Analysis Tools

» Rugged and Reliable

» Condition Based Maintenance

» Interference Rejection

» Automatic Calibration

» Scalable

» Alarm Notifcations

Why monitor for PD with

Doble?

Do you need to monitor a critical

motor?

Are you monitoring major

generators?

Do you want the assurance that you

will not miss a rapidly progressing

PD event?

Are you monitoring a problematic

machine and suspect its condition

may worsen in a short period of

time?

Phase 2: Monitoring for Partial Discharge

PD-Guard

Rely on the PD-Guard to monitor and assess insulation

condition over time, providing the time to plan corrective action.

PD-Guard will continuously monitor your assets, alerting you

before partial discharge reaches a critical stage.

The PD-Guard can be used to monitor one critical machine or is

scalable for a multi-unit site.

The PD-Guard monitors high voltage machines such as turbo

generators, hydro generators and high voltage motors.

Alarm notications warn you before partial discharge reaches a

critical state.

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Monitoring for Partial Discharge SOLUTIONS FOR ROTATING MACHINES

PD-Guard for Rotating Machines Accessories

A typical PD-Guard monitoring system consists of:

• 1 PD-Guard Partial Discharge Monitor

• 1 License for the PD Evaluation Server and associated

PD-Guard Analysis Software

• 3 FailSafe / LF Coupler (PDDC-24 or PDDC-17)

4th coupler as option

• 3 (4) Coupler installation kits

• 1 Fiber-optic Link

• 1 Database and Evaluation Server

• 1 External Calibrator

Monitoring Rotating Machines for Partial Dischargewith the PD-Guard

Doble offers the FailSafe and LF Coupler: the PDDC-17 and PDDC-24

for 17.5kV and 24kV applications.

Both couplers provide the deep sensing ability of a low frequency

capacitor and are designed for three phase and neutral rotating

machines.

The Doble FailSafe LF Coupler (PDDC-24), has the additional feature

of a fused element. Given the higher voltage applications possible

with this coupler, this added feature allows PD monitoring equipment

to be attached to buswork with greater safety and reliability.

FailSafe and LF Couplers

Rotating

Machine

LDC-5/S2

Calibrator

Fiber Optic

LAN

PD-Guard

C

B

A Buswork

N e u t r a l

optional 4th coupler

Alarm relay Box (optional)

Remote PC

LAN / WAN / Internet

PD Evaluation

Server

FailSafe LF Couplers

& Installation Kits

Support

Trend

Auto Alarm

Analysis

+

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MKT-SL-PD Solutions for RM-03/12

Doble is ISO Certifed

Doble is an ESCO Technologies Company

Expert Help When You Need It

It may not be possible to maintain PD experts on your staff. Rely

on Doble’s engineers for specialty diagnostic testing and advancedengineering support.

Client Services Support

Whether you purchase, rent or lease a Doble PD system, we would

recommend that you also have a Client Services support agreement. Doble

has multiple options for clients of all types - utilities, commercial and

industrial facilities or service providers. With this agreement, you would be

eligible for expert analysis of your test data from Doble PD systems along

with periodic written reports depending on the level of your agreement.

Product, applications and data analysis training can also be part of these

agreements.

Doble Power Services

Doble’s Power Services group can also provide on-site, non-invasive

testing services.

Electromagnetic Interference (EMI) Diagnostics

A partial discharge survey using EMI Diagnostics is a non-invasive

measurement technique that can detect and classify a wide variety of EMI

signals generated by electrical and mechanical system defects including

motor/generator stator problems, misalignment and bearing problems.

Partial Discharge AssessmentDoble can visit your site to download data from pre-installed monitors or

make spot measurements using our instrumentation. A data assessment

can be provided on an annual basis.

Doble Knowledge is Power

Founded in 1920, Doble Engineering Company works with clients

around the world to help minimize risk and maximize the performance

of their power systems. Doble has a reputation for excellence, earned

through the expertise of its engineers and the quality of its products

and services. Doble is the industry’s knowledge leader and supportsthe sharing of best practices and industry knowledge through a series

conferences around the globe.

Doble’s Client Committee on Rotating Machinery Doble’s Rotating Machinery Client Committee reviews topics of greatest

interest and concern, shares service advisories, best practices and

lessons learned. Members are Doble Services Agreement clients

and participation is limited to representatives from utility, industrial or

testing companies to facilitate open discussion without the presence of

manufacturers. The committee meets twice a year at the International

Conference of Doble Clients and the Client Committee Meetings.

TOGETHE

RWEPOWERTHEWORLD

Doble Engineering Company

Worldwide Headquarters

85 Walnut Street

Watertown, MA 02472 USA tel +1 617 926 4900

fax +1 617 926 0528

www.doble.com

SOLUTIONS FOR ROTATING MACHINES Partial Discharge Solutions Support and Services

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