Doc. SIE62153
Rev. 1
Page 4/24
1 GENERAL
1.1 The instrument
The instrument DRTS.3 PLUS (digital relay test system, three phase) is a programmable and
automatic relay test set, that permits for the automatic verification of digital protection relays, such
as those used in Medium and High voltage networks.
As compared to the former DRTS.3, the DRTS.3 PLUS version generates 15 A instead of 12.5 A.
The test bench is housed in a case 3 U high, that contains: the power supply, the interface circuits,
the control boards, the voltage and current amplifiers. The set is housed into an aluminium
container with handle for ease of transportation; the instrument is supplied with a plastic bag for
protection during transit.
The instrument operates in connection with a computer, that controls it via the RS232 serial port or
the USB port. The firmware FWH6, contained in a FLASH EPROM resident into the instrument,
allows the instrument to interpret all commands received from the computer and to transmit test
results.
Software running on the P.C. allow the user to:
. Control all current and voltage outputs, for the simulation of all types of faults: in particular, faults
that are produced on a distribution network with the neutral connected to ground;
. Change the output in a ramp or step mode;
. Define the state of inputs and outputs between two fault simulations;
. Simulate complex evolution, with faults that change during the test.
RS232
A1
C 1
ANALOG INPUT
C 5
A2
C 2
C 6
A3
C 3
C 7
A4
C 4
C 8
C
C
IMP1
250 5 A
V
~
V
~
V
~
250 V
~
EXT. AMP.
20 A
~
250 V
~
10 V
---
20 mA
---
0
0
DRTS-6
AUTOMATIC RELAY TESTING
AND MEASUREMENT SYSTEM
OK
!
ERR
ON
110/230 V 50/60 Hz
~
T16A 250V
!
V 1
V 2
V 3
I 4
I 5
I 6
IN
VN
V
---
15 A
~
260 V
---
125/300 V
~
V0/V4
I1
I2
I3
IMP2
IN
!
DRTS.3 PLUS FRONT PANEL
RTS.3
