Page 47 - dehn-catalogue-safety-equipment_0

3. Verify that the Installation is dead – DEHNcheck Phase Comparator

Design of Phase Comparators
Phase comparators in accordance with EN/IEC 61481-1 (DIN VDE 0682- The red ring indicates the end of the insulating element in the direction
431-1) are designed for testing for in-phase condition of three-phase of the test electrode. This provides the user with a visible limit of contact
systems. with live parts in the installation. The insulating element situated between
Only electrically skilled or instructed persons are allowed to test for in- the red ring and the hand guard must not contact live parts, however, it
phase condition. may contact earthed parts.
Phase comparators have to be tested for correct operation immediately The test electrode is the part of the phase comparator that is used to
before and after use. make contact with the part of the installation to be tested.
Phase comparators without self-testing element have to be tested for
correct operation by making contact with a part of the installation con-
nected to operating voltage. Single-pole PHV I 1
Testing for in-phase condition by means of a phase comparator is consid- Phase Comparator
ered live working.
Phase comparators may only be used for the nominal voltage / nominal
voltage range as indicated on the rating plate. The user may be at risk if
the phase comparator is used for voltages other than indicated on the
rating plate (incorrect indication, electric shock, arcing). lO
Phase comparators labelled “For indoor and outdoor installations” must
not be used in wet weather conditions. 2
Phase comparators labelled “Also suitable for use in wet weather condi-
tions” may be used in all weather conditions such as rain, snow, fog and
dew. 3
Phase comparators in accordance with IEC/EN 61481-1 (DIN VDE 0682-
431-1) are only suitable to a limited extent for use in factory assembled 4
(type tested) installations.
Due to the restricted space in these installations, flashover may occur
when inserting the test prod into the installation. The user of the phase
comparator or the operator of the switchgear installation must contact lG
the manufacturer of the type-tested installation to find out whether the
phase comparator may be used in the installation. lI
Design of phase comparators
Phase comparators can be designed as two-pole devices (resistive phase 5
comparators) in accordance with IEC/EN 61481-2 (DIN VDE 0682-431-2
or as single-pole devices (capacitive phase comparators) in accordance
with IEC/EN 61481-1 (DIN VDE 0682-431-1).
The design of single-pole phase comparators is similar to that of capacitive 6
voltage detectors. The functional principle of single-pole phase compara- 3. DEHNcheck Phase Comparator
tors is based on a microprocessor controlled electronic storage system.
PHV and PHV I phase comparators are complete devices and are tested 7
as a complete unit.
Single-pole phase comparators consist of a handle with hand guard, in-
sulating element, indicator and test prod with contact electrode. Two-pole
phase comparators additionally have a connecting cable.
The insulating element is the section of a phase comparator between the
hand guard and the red ring. It ensures that the user maintains an ade-
quate safety distance for safe operation. 1 Test electrode lG Total length of the phase comparator
The test prod with a contact electrode above the red ring allows to reach 2 Test prod lO Length of the top section
remote parts of the installation and to eliminate the influence of interfer- 3 Red ring lI Length of the insulating element
ence fields. 4 Indicator
The hand guard provides a visible barrier between the handle and the 5 Insulating element
insulating element and prevents the user from making contact with the 6 Hand guard
insulating element. 7 Handle
Storage Bags and Transport Cases
158
Cases: Sheet steel or plastic
Bags: Artificial leather or canvas

Maintenance Tests according to German regulations DGUV Vorschrift 3 (former BGV A3)
According to the German regulations DGUV Vorschrift 3 (former BGV A3), phase comparators have to be 145
tested for compliance with the prescribed limits as stated in the Electrical Safety Rules. This test is performed
in the high-voltage test laboratory of DEHN and includes
– measurement of the leakage current
2025 – test for clear indication
– test for protection against bridging
Wiederholungsprüfung
Nächste – visual inspection, manual tests and measurements
The maintenance test is documented in a test report and on the device.
The test intervals depend on the operating conditions of the phase comparators, e.g. frequency of use,
environmental conditions and transport. According to the German regulations DGUV Vorschrift 3, however,
it is advisable to carry out a maintenance test at least every 6 years.
Valid as of January 1, 2019 You will find detailed product information on our website 45