Schweitzer Engineering Laboratories SEL-2594 User manual

Date Code 20010827 SEL-2594 Contact Transfer Module
SEL-2594 Contact Transfer Module
Instruction Manual
i3346a
The SEL-2594 transfers contact status for
control, alarm or protective relay transfer trip
commands (teleprotection). The SEL-2594
provides eight contact inputs and eight
contact outputs. The contact input status of
one SEL-2594 is transferred to another
SEL-2594 contact output through IEEE
C37.94 compliant channels over digital
multiplexers. Prior to this interface,
connections between teleprotection
equipment and multiplexers have been
electrical only. Because low energy signal
interfaces are susceptible to electromagnetic
interference (EMI) and ground loops, the
fiber optics interface eliminates data
corruption due to these conditions.
➤Isolation Fiber optic connections
provide isolation and prevent ground
loops associated with electric
communications cables.
➤Immunity Fiber optics provide
immunity to radiated and induced voltages associated with control wiring.
➤Simple LEDs indicate the state of inputs, contact outputs and channel status. All settings are
made with a control switch—PC software is not required.
➤Secure 16 user selectable addresses for transmit and receive allows up to 240 unique address
combinations.
➤High Speed The SEL-2594 uses one 64-kilobit time slot in a digital multiplexer, and provides 8
millisecond back-to-back operate time.
1 to 8
Contact Inputs
1 to 8
Contact Outputs
SEL-2594
Contact
Transfer
Modu e
SEL-2594
Contact
Transfer
Modu e
Digita
Network
Up to 2 km of
mu timode fiber
Digita
Mu tip exer
C37.94 Comp iant
Channe Card
Digita
Mu tip exer
C37.94 Comp iant
Channe Card
Features, Benefits, and Applications

2
SEL-2594 Contact Transfer Module Date Code 20010827
Product Overview
roduct Overview
Figure 1 provides a functional overview of the SEL-2594.
Figure 1 SEL-2594 Functional Overview
FRONT
LEFT RIGHT
END
Wide range
power supp y
consumes
ess than
5 watts.
A arm contacts
signa se f-test
and received
communications
channe status.
Leve -sensitive
contact inputs
do not assert
during dc
grounds when
app ied to center-
grounded systems.
LEDs indicate
input and output
status, channe
activity, device
status, and
communications
channe hea th.
Fiber-optic port
provides e ectrica
iso ation. Communications
protoco enhances
data transfer security.
Quick setup.
Rugged and
compact
f ush mount
enc osure
withstands
EMI, RFI,
shock, and
vibration.
Output
contacts
rated for
trip and
c ose duty.
Each output
contact has
both "a" and
"b" contacts
for f exibi ity.
Screw
termina s
accept ring
ugs with
wires up to
#10 AWG.
A termina s
are c ear y
numbered.
Large
range for
insta ing
outdoors.
+85˚C
–40˚C

3
Date Code 20010827 SEL-2594 Contact Transfer Module
App ications
Applications
rotection High-speed protective relay systems rely on teleprotection equipment to send
and receive transfer tripping commands between substations. Modern utility
grade digital multiplexers include teleprotection channel cards that provide
this function using one or more of the multiplexer time slots. Often the
multiplexer is co-located with the communications equipment in the
substation, however, the communications equipment and protective relays can
be physically located in separate buildings. The physical equipment separation
requires long control cable runs between devices, increasing susceptibility to
problems associated with metallic control wiring. The SEL-2594 provides a
contact interface between the protective relay and IEEE C37.94 compliant
multiplexer equipment via a short haul fiber interface.
Figure 2 The SEL-2594 Is a Low-Cost Tele rotection
System for Use with IEEE C37.94 Com liant Digital Multi lexers
SCADA Use the SEL-2594 to extend the reach of SCADA Remote Terminal Units
(RTU). Communicate control and alarm points between remote circuit
breakers/circuit switchers and RTUs via the SEL-2594.
f
Figure 3 Use the SEL-2594 to Extend
RTU Status and Control to Other Locations
Fiber-Optic
Mux
SEL-2594
Re ay
Fiber-Optic
Mux
SEL-2594
Re ay
Digita
Mu tip exer
SEL-2594
SCADA
RTU
SEL-2594
Digita
Mu tip exer
Digita
Communications
Network
Contro signa s
to/from the
remote device

4
SEL-2594 Contact Transfer Module Date Code 20010827
Functiona Description
Functional Description
Figure 4 SEL-2594 Functional Block Diagram
Transmit Section The contact input information is passed through an input encoder, where the
contact status is encoded into a 64 kilobit per second data packet. This
“Payload” packet includes the status bits for the eight contact inputs, error
detection bits, contact output framing bits, and transmit address bits per switch
setting 1–4. The completed transmit payload packet is sent to the C37.94
framer section. The C37.94 framer section formats the payload data into a
transport frame that is used between the SEL-2594 and the multiplexer channel
card. This frame is transmitted at 2.048 megabits per second and includes
header and overhead bits, per IEEE Standard C37.94.
Figure 5 Frame Structure
The Multiplexer The transport frame is stripped off at the multiplexer channel card and the
payload data is included as a DS0 channel in the multiplexer payload. At the
remote multiplexer the DS0 data is decoded and inserted into a new transport
C37.94 frame and sent to the remote SEL-2594.
Receive Section The SEL-2594 receives data frame from the multiplexer channel card. In the
framer section the payload data is separated from the transport frame and sent
to the output decoder section. The RX LED lights if the C37.94 transport
frame is valid. In the output decoder, error detection bits are checked. If errors
are detected, the DATA LED extinguishes, the contact outputs de-energize and
the packet is discarded. If the error detection check passes, the address
information is decoded and compared to the receive address setting on
switches 5–8. If the address is different than expected, the DATA LED
extinguishes and the output contacts de-energize.
Contact
Inputs
Contact
Outputs
Output
Decoder
Input
Encoder
C37.94
Framer
TX RX
L
E
D
S
L
E
D
S
L
E
D
S
to Mu tip exer
Header Overhead Pay oad
C37.94 Frame
Transport Frame SEL-2594 Data

5
Date Code 20010827 SEL-2594 Contact Transfer Module
Configuring the SEL-2594
Configuring the SEL-2594
The SEL-2594 has a 10 position dip switch to set the transmit address, receive
address and timing mode as shown in Figure 6.
Figure 6 SEL-2505 Control Switch Position Identifications
Setting the
Transmit and
Receive Addresses
Set the transmit (TX) address of each local SEL-2594 to match the receive
(RX) address of the remote SEL-2594. The RX and TX addresses of each
device should always be set to different numbers. The SEL-2594 detects a loop
back condition when it receives the same address as the TX address setting.
When the SEL-2594 detects loop back, it illuminates the LOOP LED and
extinguishes the DATA LED. The SEL-2594 disables the contact outputs to
prevent acting on its own message during loop back.
The SEL-2594 provides 16 transmit and receive address choices. Table 1 lists
the switch positions for the 16 addresses.
Switch No. Function
1—4 Transmit Address (TX)
5—8 Receive Address (RX)
9 Timing Mode
10 Reserved
OFF
ON
10 9 8 6754321
Table 1 Transmit and Receive Address Settings
Switch Switch Switch Switch Address
TX
RX
4
8
3
7
2
6
1
5
OFF OFF OFF OFF 1
OFF OFF OFF ON 2
OFF OFF ON OFF 3
OFF OFF ON ON 4
OFF ON OFF OFF 5
OFF ON OFF ON 6
OFF ON ON OFF 7
OFF ON ON ON 8
ON OFF OFF OFF 9
ON OFF OFF ON 10
ON OFF ON OFF 11
ON OFF ON ON 12
ON ON OFF OFF 13
ON ON OFF ON 14
ON ON ON OFF 15
ON ON ON ON 16

6
SEL-2594 Contact Transfer Module Date Code 20010827
Configuring the SEL-2594
Setting
the Timing Mode
Switch 9 sets the timing mode for the SEL-2594. For normal operation set this
switch to ON. In this mode, timing is recovered from the host multiplexer.
When testing SEL-2594 devices without a multiplexer, connect the fiber
directly between two SEL-2594s and set Switch 9 to the test position on only
one SEL-2594.
When connecting two SEL-2594s back-to-back, set one timing mode switch to
OFF. With the timing mode switch set to OFF, the SEL-2594 provides timing
source for both of the SEL-2594s.
Connecting
the SEL-2594
to a Multiplexer
Use a duplex fiber optic patch cord to connect the SEL-2594 to an IEEE
C37.94 compliant channel card. Connect the TX ST connector on the
SEL-2594 to the RX ST connector on the multiplexer channel card, and
connect the RX ST connector on the SEL-2594 to the TX ST connector on the
multiplexer channel card, as shown in Figure 7.
Figure 7 Fiber-O tic Connections
RX TX
62.5 µm or 50 µm
mu timode fiber
patchcord
Mu tip exer
channe card
interface

7
Date Code 20010827 SEL-2594 Contact Transfer Module
Testing the SEL-2594
Testing the SEL-2594
Test the SEL-2594 with either a direct fiber connection to another SEL-2594,
or with two SEL-2594s connected through a multiplexer.
Step 1. Configure the SEL-2594 dip switch ID settings. Make sure the
TX address of the local SEL-2594 matches the RX address of
the remote SEL-2594. If the connection between the SEL-2594s
is direct fiber, set the timing control switch 9 to off (test) on one
SEL-2594. If the test setup includes multiplexers set switch 9 to
on (normal) on both SEL-2594s.
Step 2. Connect the chassis ground terminal of the SEL-2594 to ground
(Terminal1).
Step 3. Connect and apply rated voltage to the power supply inputs of
the SEL-2594 (positive to terminal 4, negative to terminal 3).
The ENABLE LED should illuminate. The form “B”ALARM
contact will remain closed and the ALARM LED will
illuminate (red) due to no communications.
Step 4. Press the lamp test button. All LEDs should illuminate. When
you release the button, the contact input and output LEDs
should extinguish and the remainder will return to indicating the
current communication status.
Step 5. Make the fiber optic connections between SEL-2594s either
directly or through a multiplexer by connecting the transmit
(TX) fiber on one unit to the receive fiber (RX) on the other.
The DATA, TX, and RX LEDs on both devices should
illuminate. In addition the form “B”ALARM contact should
open, and the ALARM LED should extinguish.
Step 6. Apply rated voltage to IN1 on one device. The IN1 LED should
illuminate on this device. On the other SEL-2594 the OUT1
contact should close and the OUT1 LED should illuminate.
Step 7. Repeat step 6 for the remaining contacts.
Step 8. To test the loop-back feature, set switch 9 to test, connect a
single fiber between the TX and RX on the same device. The
LOOP LED should illuminate and the DATA LED should
extinguish.
Alarm Conditions Figure 8 on page 8 illustrates the operation of the yellow alarm bit and LED.
A yellow alarm is a remote receive alarm communicated from the local
channel card to the local SEL-2594 via a predefined alarm bit in the frame. A
yellow alarm is declared when the local multiplexer channel card is not
receiving data from the local SEL-2594. The channel card sets the yellow
alarm bit in the transport frame header in the transmit direction back to the
SEL-2594. If the SEL-2594 is still receiving data from the channel card, the
yellow alarm bit is decoded and the ALARM LED is illuminated yellow.
When valid transport frames are received but the payload data is invalid, the
ALARM LED will be red, the DATA LED will turn off, and the RX LED will
remain lit.

8
SEL-2594 Contact Transfer Module Date Code 20010827
Testing the SEL-2594
Figure 8 Link Failure and Yellow Alarm Condition
LED Indications
NOTE: The SEL-2594 can decode and
display the yellow alarm bit but does not
generate a yellow alarm.
NOTE: Implementation o the yellow
alarm bit is not a requirement o IEEE
Standard C37.94. Check the multiplexer
channel card data sheet to veri y use.
M
U
L
T
I
P
L
E
X
E
R
M
U
L
T
I
P
L
E
X
E
R
SEL-2594SEL-2594
ALARM
RX
DATA
ALARM
RX
DATA
Ye ow ALARM
LED indicated
Ye ow ALARM
bit set
Fai ure of individua fiber path
The DATA LED is OFF, indicating
no pay oad data detected
Indicates receipt of va id
C37.94 transport frames
When i uminated the ENABLE
LED indicates that the SEL-2594
has power app ied, has passed
the se f-test routines, and is
ready to receive data.
IN1 through IN8 indicate that vo tage is
app ied to the corresponding contact
input termina s.
TX LED indicates the SEL-2594 is
transmitting data.
OUT1 through OUT8 indicate that the
contact output associated with that
LED is energized.
An i uminated LOOP LED indicates
that the SEL-2594 is receiving data
with the same channe address that
it is transmitting.
When i uminated, the DATA LED
indicates the received pay oad
data has passed a error checks.
When this LED is off, the contact
outputs and a arm re ays are
de-energized.
RX LED indicates receipt of va id
C37.94 transport frames.
A red ALARM LED indicates that DATA
or ENABLE criteria have not been
met.
A ye ow ALARM LED indicates the
SEL-2594 is receiving va id data from
the mu tip exer but the mu tip exer
is not receiving va id data from the
SEL-2594.

9
Date Code 20010827 SEL-2594 Contact Transfer Module
SEL-2594 Operating Time Performance
SEL-2594 Operating Time erformance
Figure 9 depicts the time to transfer a contact closure between a local and
remote SEL-2594. This figure includes a nominal 0.5 millisecond multiplexer
through delay. Actual through delay will vary depending on multiplexer type
and network configuration.
Figure 9 End-to-End O erating Time Diagram
Input
SEL-2594
Contact
Power Fiber-Optic
Transmitter
SEL-2594
Output
Fiber-Optic
Receiver
MULTIPLEXER
MULTIPLEXER
6.5 ms
0.5 ms 8 ms Tota
1 ms

10
SEL-2594 Contact Transfer Module Date Code 20010827
Mechanica Diagram
Mechanical Diagram
Figure 10 SEL-2594 Dimensions and Drill Diagram

11
Date Code 20010827 SEL-2594 Contact Transfer Module
Specifications
Specifications
Output Contacts
IEEE C37.90 Tripping Output Performance.
Make: 30 A
Carry: 6 A
MOV protected: 270 Vac rms
360 Vdc continuous
Optoisolated Inputs
250 Vdc: Pickup 210 –300 Vdc
Dropout <150 Vdc
125 Vdc: Pickup 105 –150 Vdc
Dropout <75 Vdc
110 Vdc: Pickup 88 –132 Vdc
Dropout <66 Vdc
48 Vdc: Pickup 38.4–60 Vdc
Dropout <28.8 Vdc
24 Vdc: Pickup 15 –30 Vdc
Note: 24, 48, 110, and 125 Vdc optoisolated inputs draw approx. 4
mA of current.
Contact Input/Output Update Rate
1 kHz
Power Supply
Rated: 125/250 Vdc or Vac
Range: 85–350 Vdc or 85–264 Vac
Burden: <5 W
Rated: 48/125 Vdc or 125 Vac
Range: 36–200 Vdc or 85–140 Vac
Burden: <5 W
Back-to-Back Operate Time Without Propa ation Delay
8 ms
Protocol
IEEE C37.94*
Port Speed (Data Rate)
64 kbps (1DS0)
Fiber Optic
Operatin Temperature Ran e
–40°to +85°C
–40°to +185°F
Unit Wei ht
2.73 kg (3 lb, 0 oz)
Dimensions
338.6 mm x 165.1 mm x 55.4 mm
(13.33" H x 6.5" W x 2.18" D)
Type Tests
Dielectric: IEC 255-5: 1977, 2.5 kV rms, 1 min
Environmental: IEC 68-2-1: 1990
IEC 68-2-2: 1974
Damp Heat Cycle: IEC 68-2-30:1980
Impulse: IEC 255-5: 1977, 5 kV 0.5 J
Electrostatic
Discharge: IEC 801-2: 1991, Level 4
IEC 255-22-2: 1989, Level 4
Radio Frequency
Immunity: IEC 801-3: 1984
IEC 255-22-3: 1989
Fast Transient Burst: IEC 801-4: 1988, Level 4
IEC 255-22-4: 1992, Level 4
Surge Withstand: IEC 255-22-1: 1988
IEEE C37.90.1: 1989
5 kV Impulse: IEC 255-5: 1997
Vibration: IEC 255-21-1: 1988
Endurance: Class 1
Response: Class 2
Shock and Bump: IEC 255-21-2: 1988
Bump: Class 1
Shock Withstand: Class 1
Shock Response: Class 2
Certifications
ISO: Module is designed and manufactured to an ISO-9001 certified
quality program.
CE Mark.
* At the time o this printing, the IEEE C37.94 had not been released.
This device is compliant to C37.94 Dra t 6 dated 11-1-2000.
Optical Fiber
Core Size
Optical
Budget
50 µm
62.5 µm
9.0 dB
13.0 dB
2 km Fiber
820 nm Typical ttenuation
5.6 dB (margin = 3.4 dB)
6.2 dB (margin = 6.8 dB)

SEL-2594 Contact Transfer Module Date Code 20010827
SCHWEITZER ENGINEERING L BOR TORIES
2350 NE Hopkins Court • Pu man, WA 99163-5603 • USA
Phone: [phone] • Fax: [phone]
Internet: www.se inc.com • E-mai : info@se inc.com
!C UTION: The module contains devices
sensitive to Electrostatic Discharge (ESD). When
working on the module with the ront panel
removed, work sur aces and personnel must be
properly grounded or equipment damage may
result.
!C UTION: Removal o enclosure panels exposes
circuitry which may cause electrical shock which can
result in injury or death.
!D NGER: Contact with instrument terminals may
cause electrical shock which can result in injury or death.
!D NGER: Contact with this circuitry may cause
electrical shock that can result in injury or death.
Schweitzer Engineering Laboratories, SELOGIC, Connectorized, Job Done, SEL-PROFILE, and are
registered trademarks of Schweitzer Engineering Laboratories. A brand or product names appearing
in this document are the trademark or registered trademark of their respective ho ders. U.S. and For-
eign Patents Pending.
The software (firmware), schematic drawings, modu e commands, and modu e messages are copyright
protected by the United States Copyright Law and Internationa Treaty provisions. A rights are
reserved. You may not copy, a ter, disassemb e, or reverse-engineer the software. You may not provide
the software to any third party.
The information in this manua is furnished for informationa use on y and is subject to change without
notice. The Eng ish anguage manua is the on y approved SEL manua .
ã 2001 Schweitzer Engineering Laboratories. A rights reserved.
!TTENTION: Le module contient des pièces
sensibles aux décharges électrostatiques. Quand on
travaille sur le module avec les panneaux avant ou du
dessus enlevés, toutes les sur aces et le personnel
doivent être mis à la terre convenablement pour
éviter les dommages à l’équipement.
!TTENTION: Le retrait des panneaux du boîtier
expose le circuit qui peut causer des chocos électriques
pouvant entraîner des blessures ou la mort.
!D NGER: Tout contact avec les bornes de
raccordement de l’appareil peut causer un choc
électrique pouvant entraîner des blessures ou la mort.
D NGER: Tout contact avec ce circuit peut être
la cause d’un choc électrique pouvant entraîner des
blessuers ou la mort.
!
Notes