Atec Biddle-27000 User Manual

Page 3

PARTIAL DISCHARGE DETECTION SYSTEMS

Power Separation Filter

Bushing

Tap

Coupler

Bridge

Coupling

Unit

APPLICATIONS

The keystone of all partial discharge
detection systems is the partial dis-
charge detector. This unit provides all of
the instrumentation necessary for mak-
ing partial discharge level
measurements when used with appro-
priate auxiliary components. The Biddle
partial discharge detector combines cali-
bration, amplification and oscilloscope
display sections in an attractive panel
suitable for rack mounting.

Electronic measurement circuitry
contained within the Series 27000
detector permits quantifying and
expressing partial discharge in objec-
tive terms. This decreases the need for
reliance on subjective operator inter-
pretations of test results, and
allows for consistent, repeatable evalu-
ation and comparison of test data.

FEATURES AND BENEFITS

Five built-in types of data readout pro-
vide a wide range of test data formats:
• CRT display
• Three simultaneous channels off

analog output suitable for graphic
recording of peak partial discharge

(picocoulombs), average partial dis-
charge (microamperes) and
apparent partial discharge energy
or power loss (milliwatts)

• Digital display of any of the above

selected data channels

• Programmable partial discharge

overlimit trip indicator

• RS-232C interface permits data

archiving and test report generation.

A standard computer interface unit
provides for archiving data and re-
motely controlling detector sensitivity
and calibration.

Three built-in types of interference con-
trol permit testing under adverse local
noise conditions:
• Fully adjustable partial discharge

inspection windows automatically
synchronized to the test voltage

• A partial discharge level detector

with programmable response for
partial discharge signal magnitude
level, signal repetitions per half-
cycle and consecutive half-cycles

• A partial discharge measurement

circuit that employs digital filtering
for minimizing the effects of noise

Automatic synchronization of scope
display, calibration signals and window-
gating circuits allows full function test-
ing at frequencies from 50 to 500 Hertz.

Switchable passband options increase
interference control and expand the
range of testing applications.

Selectable, multiformat scope display
accommodates user preferences:
• Available baseline formats: sinusoi-

dal, flat-line and elliptical. Baseline
phase verification is provided by 0
and 270

markers.

• Available partial discharge signal

formats: unrectified pulses, or posi-
tive or negative polarity only

Built-in calibration signal generator
simplifies test data quantification.

Detector meets the requirements of IEC
270, IEEE 454-73; ASTM D-1868; IEEE
C57.113; ICEA T-24-380; AEIC CS5, CS6, CS7;
NEMA WC5, WC7, 502, 540; UL 1072; ICEA S
61-402, S 66-524, S 68-516; and MIL-T-27.

Schematic diagram showing basic partial discharge detection system configurations available with Series 27000 detector