14
Note
: DS1 is equipped with an internal event recorder that re-
cords all the events and operations the switch is requested to
perform. ABB’s service technician can detect any misuse of the
reset, homing and upstream CB functions.
The warranty and ABB’s liability for the DS1 will become void
following misuse of the special input.
When a reset command is given, DS1 resets
the alarm and returns to its operating state.
This operation can only take place if DS1
has been de-energized.
Is strictly forbidden to reset an Alarm that
occurs when DS1 is in service in order to
enable it to become operative again.
ABB declines all liability for the DS1 fol-
lowing failure to comply with this rule.
IMPORTANT
Operators who manage the DS1 must
be informed that use of the upstream
CB Interlock (maintenance mode) when
the switch is energized by MV can result
in serious malfunctioning of the entire
apparatus.
3.6 Electrical characteristics of the INPUT
The DS1 input electrical characteristics are summarized in the
table below:
Description
Activation
Voltage
Average Power
Required
Reaction
time
Open
24 VDC
5W
20 ms
Close
24 VDC
5W
20 ms
Interlock
24 VDC
<1W
1 sec
Reset
24 VDC
5W
20 ms
Homing
24 VDC
5W
20 ms
UP STREAM CB
24 VDC
<1W
1 sec
Table 5. DS1 - Description of the input
3.7 Input Acceptance Logic
When the system is ready to operate, the Input Acceptance
Logic is as follows:
− Level-triggered Open Trip command
− Edge-triggered Close Trip
Consult the detailed functional description and diagnostics
section for a description of the condition that enables opera-
tion.
3.8 DS1 functional descriptions
DS1 performs synchronous switching with the control sys-
tem constantly engaged with the upstream voltage reference.
To achieve this, the signal from a voltage divider (mandatory
phase to ground on phase R) is detected by its control system.
When commissioning has terminated, DS1 is ready to operate
2-3 seconds after its control system has measured the AC volt-
age reference (the Ready relay is closed at this stage).
−
Close
command, DS1 closes the circuit.
−
Open
command, DS1 opens the circuit.
Open/Close are accomplished by synchronizing the move-
ment of the power part in order to energize and de-energize
the power capacitor bank with the internal power diode when
requested by the substation.
In addition to its main function, DS1 is equipped with a pow-
erful diagnostics able to identify internal faults (motor, control
system, etc.) in the system before the operation.
Ready Output OFF (Not ready Condition)
The switch is not ready to operate. This situation:
− can be temporary at power up (for the time required by the
DS1 Control System to charge the main capacitor and per-
form system diagnostics);
− can occur when upstream voltage is not present;
− can occur when the interlock circuit has been opened;
− can occur when the time required for the MV capacitor bank
to discharge after an Open operation has not elapsed (DS1
allows a configurable time to discharge the MV capacitor
bank by applying a mask on close command-close com-
mand inhibition).
Standard Close command inhibition is 5 minutes. DS1 ap-
plies the same Close command inhibition setting at startup.
Please contact ABB for special close command inhibition
times or to bypass this function;
− can occur when the control system is overheated (automati-
cally recovered when the temperature returns below a trip-
ping threshold). The maximum admissible operating temper-
ature for DS1 (external to the switch) is +55 °C;
− can be due to internal diagnostic faults (e.g. communica-
tion lost between the three controls, incorrect internal volt-
age power rails, or encoder coherence test not passed). All
the internal diagnostic faults automatically recover when the
system re-acquires full functionality.
Alarm Output ON (Alarm Condition)
The alarm status of the switch will be provided by a clean con-
tact that is normally open when the switch is fully operating.
This contact will be closed by the DS1 control system when a
faulty condition is detected. An alarm status also implies Ready
output OFF (Not Ready Condition)
−
Ready ON
: the switch is fully operating. The dry contact of
the ready status is closed. Installation of a lamp (conforming
to the current capability of the contact) is recommended.
The lamp (or the contact) will be OFF (or open) if a faulty
condition occurs and prevents synchronized switching.
Provided
by
Northeast
Power
Systems,
Inc.
(NEPSI)