Máy tạo dòng điện PCU2 mk5

Features

· 20kVA 5 minute output capability

· Continuously variable output

· Multi-function timing system

· Digital true RMS memory

ammeter

· Bright LED displays

· Automatic switch-off at end of test

· Centralised control and metering

· Separate control and loading units

· Output up to 10kA

· Low impedance, dual-range

outputs

The  PCU2  Mk5  primary  current  injection  system  is  ideally

suited to commissioning and maintenance testing where very

high currents are required.  The system consists of separate

control and loading units for maximum flexibility.  The control

unit contains all control and metering circuitry, and is linked to

the loading unit by control and metering cables.  

The  control  unit may  be used with  one  of  two  loading  units

providing between 5000A or 6000A for 5 minutes or up to 10

or 12kA for short periods.  Each loading unit has two outputs

which may  be  connected  in  series  or  parallel  for maximum

flexibility.   For  example,  the  LU6000 may  be  configured  to

either give a maximum current of 3000A at 6.6V or 6000A at

3.3V.

The control and loading units are each housed in tough steel

cases  fitted with  castors and protective  lifting handles.  The

loading  units  have  a  small  plan  area  to  allow  them to  be

positioned as close as possible to the test object, minimising

power requirements and maximising the available current.

The PCU2 Mk5  control  unit  is  shown  here with  an  LU5000

loading unit.  This combination may be used to inject currents

of up to 5000A for 5 minutes, 8000A for 5 seconds or 10000A

for 1 second.

This unit is ideally suited to all primary current injection tasks,

including  testing  under  and  over  current  relays,  circuit

breakers and CT ratio testing. 

PCU2 mk5 

The control unit is rated at 20kVA and has digital metering.  A

memory  facility  is  provided  on  the  metering  to  hold  the

current reading when the  output trips or is switched off.  The

current  is  automatically  switched  off when  the  device  under

test trips.

A  flexible  timing  system  is provided, allowing  timing  tests  to

be carried out  to a  resolution of 1ms.  Selection  for normally

open or normally closed contacts is automatic, and the status

of  the  contacts  is  shown on  the  front panel.   Timing modes

are  available  to  test  under  and  overcurrent  devices,

reclosers, under and over  voltage devices,  current  trips and

circuit breakers.

PCU2 mk5 System Specification

Metering

The AC output current is metered by a true RMS 4 digit memory

ammeter with an LED display. 

Timing System

The  PCU2  mk5  has  a  flexible  timing  system  with  two  contact

inputs and  5 operating modes.  Both  the start and stop  contact

circuits  will  accept  volt  free  contacts.   Each  contact  circuit

automatically selects  for N/O or N/C contacts, and  the status of

each  contact  input  is shown by an LED.   In addition  to contact

operation,  the  first  timing  channel  may  be  triggered  by a  dc

voltage  between  24  and  240V.   The  timing  system  will  also

respond  to  the  rise  and  fall  of  current  in  the  test  object  for

devices where no auxiliary contact is available. A pulse mode is

also provided to allow injection for short periods (500ms) to avoid

unnecessarily heating thermal trips.

Timer resolution                       1ms

Timer full scale                         999.999s

Timer accuracy                        ±0.01%rdg+2d

                                                   ±0.01%rdg+3d current operated mode

Contact O/C voltage                 24V

Contact S/C current                100mA

Vdc input range                        24-240Vdc

Timer mode                                Timer start                    Timer stop

Normal                                       ‘On’ button                 Contact

Single contact                            Contact 1                   Contact 1

Dual contact                               Contact 1                   Contact 2

Current                                       Current >20%             Current <20%

                                                   of range                        of range

Off                                              Timer inactive

Accessories supplied with system

Spare fuse set, operating manual.

1 x 5m loading unit power interconnection lead. 

1 x 5m loading unit metering interconnection lead.

1 x 2m mains lead 

Unit                     Dimensions                           Weight

Control unit          660 x 400 x 740mm                     115kg

LU5000                 660 x 400 x 740mm                     155kg

LU6000                 660 x 400 x 740mm                    135kg

Optional Output Lead Set Specifications

A  range  of  output  lead  sets  are  available  to  complement  the

PCU2  mk5  system  with  current  ratings  between  3000A  and

6000A.  The leads are double insulated and have good flexibility.

Type                Length               CSA                 Termination

3000AL          2.5m                  560mm2

           Copper bar

4000AL          2.5m                  700mm2

           Copper bar

5000AL          2m                     840mm2

           Copper bar

6000AL          2m                     1120mm2

         Copper bar

Other  output

lead  lengths

are  available

on request.

28  PCU2 mk5 Data sheet rev 1  27/03/08

    Parallel mode  Series mode

Range 1   Full scale  5000A  2500A

Resolution  1A  1A

Accuracy  0.6% rdg+6d  0.6% rdg+6d

Current trip  5500A  2750A

Full scale  10.00kA  5.00kA

Resolution  0.01kA  0.01kA

Accuracy  0.6% rdg+6d  0.6% rdg+6d

Current trip  11000A  5500A

Range 2

Memory ammeter aquisition time      200ms

Loading Unit Output

The output of the loading unit is continuously variable from zero.

Each unit may be operated in series/parallel mode to allow for a

greater  range  of  load  impedances.    All  metering  and  tripping

functions are handled by the control unit.

Protection and Safety

The  PCU2  mk5  and  loading  units  are  CE  marked  and  are

designed to meet the requirements of BS EN61010.

The  system  is  protected  by  a  circuit  breaker  and  fuse  on  the

mains  input, a circuit breaker on  the  loading unit output  and an

electronic trip on the output.

Supply Requirements

230V±10%       49-61Hz           1ph       23kVA 5 min/46kVA  1s

Temperature Range

Storage -20°C to 60°C, Operating 0°C to 45°C