Megger PCITS2000/2, Руководство пользователя

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The PCITS600/2 and PCITS2000/2 Primary Current Injection Test Sets are rugged, self-contained
instruments designed for operation by one person. They provide facilities for testing all elements of
electricity supply/distribution protective equipment.
The PCITS600/2 is built into a tough moulded plastic casing, with carrying handles, and has a protective
cover over the terminal panel. A transportation trolley is available separately. The PCITS2000/2 is
constructed in a sheet steel case on a two wheeled trolley, and can be used in either its horizontal or
vertical position. The terminal panel for each instrument contains the range switch, power supply switch,
output terminals and time counter terminals. The test set is operated from a separate hand-held controller
linked to the main unit by an expandable coiled lead.
The, fully variable, current outputs from each test set are:-
PCITS600/2 600 A at 0-4 V a.c.
300 A at 0-8 V a.c.
PCITS2000/2 2000 A at 0-3 V a.c.
1,000 A at 0-6 V a.c.
The supply voltage requirements are 220 V/240 V + 6% -10% 50 Hz/60 Hz single phase, i.e. 198 V to
254 V, at full output current. Two auxiliary voltage outputs are available from each set; 0 to 125 V a.c. and 0
to 250 V a.c. It is important to note that on the main current outputs a duty cycle applies above 40% of rated
output.
The test sets have magnetic circuit breakers, fuse and thermal protection. Output test leads are available as
separate items.
The illustration of figure 1 shows the components of the terminal panel and controller and their function is
briefly described below.
Power Input
The mains supply cable is permanently connected through a strain relieving gland. Adjacent to this is a
green/yellow terminal by which the test set may be separately earthed so that total reliance for earthing is
not placed on the supply cable. The supply cable must be terminated with a suitable plug bearing in mind
the kVA rating of the test set. Observe the correct polarity when connecting a plug to the cable; brown to
line, blue to neutral and green/yellow to earth.
The power supply switch is a two-position on/off type marked ‘
●●
’ and ‘
❙❙
’, and there is an amber indicating
lamp to show when the power is switched on.
Output Terminals
The main heavy current output terminals have wing-nut screw clamps and those for the auxiliary voltage
output and time counter will take normal spade connectors or 4 mm plugs (Current output, voltage output
and time counter each have their own pair of terminals).
Range Switch
A two-position rotary switch selects the higher and lower current/auxiliary voltage ranges. Apart from this
coarse range selection the remainder of the operation of the test set is achieved via the hand-held
controller. The higher current range (600 A or 2000 A) should be used for most testing purposes. The lower
current range (300 A or 1000 A) is provided to enable current injection into high impedance loads at a
higher output voltage.
Hand-held Controller
The hand-held controller has grip pads whereby it may be fixed in place on the main unit of the test set. It
may be used in that position but more likely it will be lifted off and held in the hand during operation. This
facility enables the user to leave the heavy main unit on the floor and still control the test while observing
closely the protective relay under test (which may be a metre or so above the floor).
The test set incorporates a microprocessor and utilises the benefits from this type of circuitry. The controller
has an alpha-numeric dot-matrix liquid crystal display. The programme menus, set-up instructions and test
General Description
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