| Description
RED 421
is a numerical four stage ground fault protection for power transmitting
networks. Event Recorder and Disturbance Recorder functions are integrated
into the device. Communication with SCADA or substation controller equipment
(work wtation) is available. The connection can be done via serial interfaces
through the choice of data cable, modem, or optical fibers.
Relay protection functions
ANSI 50N, 51N, 67N: Overcurrent ground fault
protection (OGFP)
| |
Directional or non-directional
ground-fault protection with definite time delay
Up to 4 stages and possibility for switching ON or OFF for each
stage separately
Each stage can be set in forward or reverse direction or non- directional
Each stage can utilize communication logic: receive and/or send
PLC acceleration command with operating of its measuring elements
Each stage can be used in switch-onto-fault logic (SOTF) with manual
or remote energizing of the line
Each stage individually can be blocked by the fuse failure supervision
function
The directional relay of each stage individually can be blocked
by the fuse failure supervision function
Current elements: 1 for each stage
Settings of each stage: (0,1 ... 40).In
Reset ratio: 0,93
Accuracy: ± 2,5 % of set value
Operating time: up to 30 ms
Directional elements: 1 for each stage
Working range:
- in forward direction: [157,5°...180°...-22,5°]
- in reversal direction: [-22,5°...0°...157,5°]
No dead zone
Accuracy: ± 1 °
Timers: 1 for each stage
Setting for each stage: 0,00 ... 10,00 s
Accuracy: ± 0,5 % of the set value but not less than 10 ms |
Data aquisition & remote control functions
Remote measurement
| |
Measures, processes and
archives information about instant and integral values for the analogue
quantities of the protected line;
Calculates the average “rms” values of the voltage for each second
and sends them through the local network to the connected PC work
station (WS)
Sends the data to the WS for maximal registered values
The measured analogue values are displayed continuously on the LCD
of the device
The remote measurements are sent periodically through LAN to the work
station. |
Remote control
| |
The function permits direct
control of the line’s circuit breaker and disconnectors in two ways
– by means of SCADA-system (remote control commands from work station
PC received trough the local network) or initiated by pressing of
spatially designed push buttons “I” and “O” situated on the device’s
front panel. |
Remote signalization
| |
RED
421 receives processes and archives the following information:
Primary equipment
status change;
Warning and
alarm signalization received from external devices for relay pro-tection
and automation – operation of load shedding relays and auxiliary power
supply failure relays, for example
Pick-up and
drop-off of the current and voltage relays of the internal relay protection
functions
Trip commands
sent to the CB from internal relay protection functions
Alarm signalization
related to the remote control function operation (CB or disconnectors)
– failure in execution of the remote control command, attempt for
not permitted command issuing and etc.
Signalizations
for controlled values limit overreaching
The device time
synchronizations (by front panel or remotely)
Changing of
the working parameters of the device (new configuration, new re-lay
protection settings and new parameters for remote control functions)
Clearing of
the data from Event Recorder or Disturbance recorder |
Event Recorder function
| |
The event recorder memory
buffer is designed for up to 2000 records.
Each of the records consists of information about the event type,
the real time of its appearance (year, month, day, hour, minute, second,
second/1000) and in certain cases – some numerical data characterizing
the process recorded.
The information recorded is stored in non-volatile memory and can
be shown on the device’s display and/or memorized on the PC running
the MMI program.
In the unit’s memory the stored event can be found and displayed using
the following attributes:
Last stored
event
The events stored during the last hour
The events stored during last 24 hours
The events stored during the last month (up to the same moment in
the previous month)
The records stored during the chosen day |
Disturbance Recorder function
| |
For each of the event included
into the Event recorder can be set to initiate additional more detailed
oscillographic data collection. The period of the data collection
consist of two intervals pre-history duration and during the fault.
These records consist of all measured and calculated analogue values
(wave-form), binary inputs and outputs and processing points. The
values recorded are measured with maximal sampling frequency of the
device. The records from the Disturbance recorder function can be
transferred to the connected PC running MMI service program. On the
Work station PC (SCADA-system) the information recorded can be added
to the archive displayed in graphical way and used for detailed analysis
of the primary events and the behavior of the relay protections and
primary equipment. |
Working in SCADA-system
| |
The device can be connected
to Work Station in SCADA-system by means of local network. The network
is based on RS485 or fiber optic – the respective interface connector
is used. The communication protocol is IEC 60870-5-103 / IEC 61850.
The device’s data acquisition and remote control functions are performed
by means of work station – measuring, signaling, remote control
(opening or closing command to the circuit breaker, disconnecttors,
earthing switch).
Additionally by work station facilities the device can be configured
its settings parameters, can be read and corrected and all stored
into unit’s memory data can be archived. Also all data stored by
means of “Disturbance recorder” and “Event recorder” functions can
be transferred and archived into WS for farther analysis. |
Human Machine Interface (HMI)
Man Machine Interface - MMI
Technical data
POWER
SUPPLY |
|
| Rated
voltage, Un |
24/48/110/220
V DC/AC |
| Working
range |
-20
% ... +20 % |
DC
supply interruption |
According
to IEC 60255-11:
0,1 s / 100 % при 220 V;
0,02 s / 100 % при 24 V |
| Burden |
6
W at 220 V DC |
| ANALOG
INPUTS |
|
| Frequency |
|
| -rated
values fn |
50
Hz (option 60 Hz) |
| -
operational range |
46
... 52 Hz |
Voltage
inputs |
1
pcs |
| Rated voltage, Un |
100
V |
| Operational
range |
(0,01...1,3).Un
|
| Consumption at Un |
0,1 VA |
| Continuously Voltage Withstand |
2,5.Un
|
| Current
Inputs |
1
бр. |
| Rated
current, In |
5
А (or 1 A) |
| Range of precise operation |
(0,2
... 40).In |
| Thermal current withstand
acc. IEC 60255-6, IEC 60255-3 |
continuous
- 10.In
for 10 s - 10.In
for 1 s - 100.In
for 10 ms - 250.In |
| Consumption |
<0,18 VA at In = 5 A
< 0,03 VA at In = 1 A |
| BINARY
INPUTS |
|
| Total
number |
4
pcs. (option - 8 pcs.) |
| Auxiliary
power supply |
|
-
Rated voltage |
24/48/110/220
V DC/AC
(optional AC binary inputs) |
| -
Operational range |
176...342
V DC at Un=220 V DC
65 ... 171 V DC at Un=110 V DC |
| Burden in each input circuit |
<0,7 W at 220 V DC |
BINARY
OUTPUTS |
|
| Total
number |
5
pcs. (option - 8 pcs.) |
Electromechanical relays with NO/NC contacts |
8
А max
250 V
AC / DC max
2 000
VA
< 10
ms operation time |
| CONSTRUCTION
|
|
| External part |
Metal welded box |
| Flush
mounting |
|
| Dimensions |
300
mm x 195 mm x 51 mm |
| Weight |
2
kg |
| Protection degree (according to IEC
529) |
Front
panel: IP52
Terminal blocks: IP20 |
| Surface
mounting |
|
| Dimensions |
280
mm x 165 mm x 40 mm |
| Weight |
2,5
kg |
| Protection degree (according to IEC 529) |
Front
panel: IP52
Terminal blocks: IP20 |
| INTERFACES |
|
| Communication
protocols: |
IEC 60870-5-103, IEC 60870-5-NEO,
IEC 61850 |
| Optical interface |
l= 650 nm
POF (1 mm до 50 m)
HCS (1 mm до 500 m) |
| RS485 electrical |
38,4 kbit/s max |
| RS232
current loop / optical head |
9,6
kbit/s |
| ELECTRICAL
TESTS |
|
| Insulation
Tests |
IEC
60255-5, class 3 |
| –
High Voltage Test |
2,5
kV; 50 Hz; 1 min |
| –
Impulse Voltage Test |
5
kV; 1,2 / 50 ms; 0,5 J |
| –
Insulation Resistance Test |
>100
MW ; 500 V DC |
| ELECTROMAGNETIC
COMPATIBILITY (EMC) |
|
| EMC
– disturbance immunity |
|
| Electrostatic
Discharge |
IEC
60255-22-2; EN 61000-4-2, calss 4 |
| –
Air discharge |
15
kV; 150 pF; Ri = 330 W
|
| –
Contact discharge |
8
kV; 150 pF; Ri = 330 W
|
| Radio-frequency Electromagnetic Field: |
IEC
60255-22-3; EN 61000-4-3, class 3 |
| –
Non-modulated |
80 MHz ... 1000 MHz,
10 V/m, 80% AM,
1 kHz; |
| –
Amplitude modulated |
900
MHz, 10 V/m, 200 Hz |
| Fast Transients |
IEC
60255-22-4; EN 61000-4-4, class 4:
2 kV; 5/50 ns; 5kHz;
burst length 15 ms;
repetition rate 300 ms;
duration 1 min
|
| Surge
immunity |
IEC
60255-22-5; EN 61000-4-5, class 3 |
| |
2
kV line to earth 1.2/50 ms (8/20
ms) |
| |
1
kV line to earth 1.2/50 ms (8/20
ms) |
| Conductive
radio disturbances |
IEC
60255-22-6; EN 61000-4-6, class 3
10 V; 150 kHz…80
MHz;
80% АМ; 1кHz |
| Power frequency magnetic field |
EN
61000-4-8, class 4
30 A/m continuous
300 A/m
за 3 s; 50 Hz |
| High frequency disturbance |
IEC
60255-22-1, EN 61000-4-12, class 3
1 MHz, 400 shots/s,
duration 2 s |
| –
Common mode |
2,5
kV |
| –
Differential mode |
1kV |
| EMC
- emissions |
|
| Interruptions to and alternating component (ripple)
in d.c. auxiliary energizing quantity of measuring relays |
IEC
CISPR 22 class А |
| MECHANICAL
TESTS |
|
| During operation |
|
| Vibration |
IEC
60255-21-1; IEC 60068-2-6
10 Hz … 60 Hz:
amplitude 0,075 mm;
60 Hz …150 Hz: 1 g
1 oct/min; 20 cycles |
| Shocks |
IEC
60255-21-2; IEC 60068-2-27
Half sine, 15 g, duration 11ms |
| Seismic tests |
IEC
60255-21-3, class 1 |
| During
transport (with standard package) |
|
| Vibrations |
IEC
60255-21-1; IEC 60068-2-6
5 Hz … 8 Hz:
amplitude 7,5 mm;
8 Hz …150 Hz: 2 g;
1 oct/min; 20 cycles |
| Shocks |
IEC
60255-21-2; IEC 60068-2-27
Half sine, 30 g, duration 18ms |
| AMBIENT
CONDITIONS |
|
| During
transportation and storage |
IEC 60068-2-1;
IEC 60068-2-2 |
| –
During transportation and storage |
-40
... +70 ° C |
| –
During exploitation |
-5
...+55 ° C |
| Relative air humidity |
IEC
60068-2-3: 95% at 40 ° C |
|
