CMTCS_
Trip Circuit Supervision
1MRS752363-MUM
Issued: 10/1997
Version: F/23.06.2005
Data subject to change without notice
Contents
1. Introduction ................................................................................................ 2
1.1
Features................................................................................................ 2
1.2
Application ............................................................................................ 2
1.3
Input description ................................................................................... 3
1.4
Output description................................................................................. 3
2. Description of operation............................................................................ 4
2.1
Configuration ........................................................................................ 4
2.2
Operation criteria .................................................................................. 4
2.3
Alarm acknowledgement....................................................................... 6
2.4
Resetting............................................................................................... 6
3. Parameters and events .............................................................................. 7
3.1
General ................................................................................................. 7
3.2
Setting values ....................................................................................... 8
3.3
3.2.1
Actual settings ............................................................................. 8
3.2.2
Control settings............................................................................ 8
Measurement values............................................................................. 9
3.3.1
Input data..................................................................................... 9
3.3.2
Output data .................................................................................. 9
3.3.3
Events.......................................................................................... 9
4. Technical data .......................................................................................... 10
CMTCS_
Distribution Automation
1.
Introduction
1.1
Features
• The trip coil control and measuring circuits are continuously supervised regarding
interruptions, and an alarm is issued in case of an interruption
• In the RED 500 Platform, two trip output relays are provided with trip circuit
supervision
1.2
Application
This document specifies the functions of the trip circuit supervision function blocks
CMTCS1 and CMTCS2 used in products based on the RED 500 Platform. The
function blocks are identical in operation.
The function block does not perform the supervision itself but it is used as an aid for
configuration. The functional part belongs mainly to the self-supervision tasks of the
PS_ card.
Table 1 .
Protection diagram symbols used in the relay terminal
ABB
IEC
ANSI
CMTCS_
TCS_
TCS_
For IEC symbols used in single line diagrams, refer to the manual “Technical
Descriptions of Functions, Introduction”, 1MRS750528-MUM.
Figure 1. Function block symbols of CMTCS1 and CMTCS2
2
CMTCS_
Distribution Automation
1.3
1.4
Input description
Name
TCSSTATE
Type
Digital signal (BOOL, active low)
Description
Trip circuit supervision state
from I/O-card
BS
Digital signal (BOOL, active high)
Blocking signal of the trip circuit
supervision
Output description
Name
ALARM
Type
Digital signal (BOOL, active high)
Description
Trip circuit supervision alarm
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CMTCS_
Distribution Automation
2.
Description of operation
2.1
Configuration
The trip circuit supervision status signals from the PS1 card (TCS1 and TCS2) can be
connected by means of the Relay Configuration Tool. The blocking signals can also
be configured by the user with the configuration tool.
2.2
Operation criteria
The trip circuit supervision is based on the constant current injection principle. If the
resistance of the trip circuit exceeds a certain limit, e.g. because of loose contacts or
oxidation, or if the OPEN contact has welded, the voltage over the OPEN contact falls
below 20 V dc and the supervision function of the trip circuit is activated.
The supervision state (TCS1 or TCS2) is logical TRUE when the trip circuit condition
is OK and FALSE when a trip circuit fault has occurred. The TCSSTATE input is
used for monitoring the supervision state. The function block includes a delay
parameter that can be defined by the user. If the fault time exceeds the delay parameter
time, the ALARM output of the function block is activated along with the respective
notification on the MMI.
The input/output circuits are galvanically isolated from each other. The constantcurrent generator forces a 1.5 mA measuring current through the circuit-breaker trip
circuit. The constant current generator is connected over the trip contact of the circuit.
The current generator for the TCS1 is connected to the terminals X4.1/12-13 and the
current generator for the TCS2 to the terminals X4.1/17-18 of the RE_ 54_ terminal.
Under no-fault conditions, the voltage over the contact of the constant current
generator must be above 20 V ac/dc.
Mathematically, the operating condition can be expressed as:
Uc – (Rhext + Rhint + Rs) x Ic ≥ 20 V ac/dc
where
4
Uc
operating voltage over the supervised trip circuit
Ic
measuring current through the trip circuit, approximately 1.5 mA
(0.99 ... 1.72 mA)
Rhext
external shunt resistor value
Rhint
internal shunt resistor value, 1 kΩ
Rs
trip coil resistance value
CMTCS_
Distribution Automation
The resistor Rhext must be so calculated that the trip circuit supervision current through
the resistor is low enough not to influence the trip coil of the circuit breaker. On the
other hand, the voltage drop over the resistor Rhext must be low enough not to
jeopardize the operating condition presented in the formula above.
The following values are recommended for the resistor Rhext in Figure 2 below:
Operating voltage Uc
48 V dc
Shunt resistor Rhext
1.2 kΩ, 5 W
60 V dc
5.6 kΩ, 5 W
110 V dc
22 kΩ, 5 W
220 V dc
33 kΩ, 5 W
-
Uc
+
TCS_
Ic
20 V
Rh int
1 kW
CMTCS_
A
L
M
R
A
TCSSTATE ALARM
BS
Rh ext
Rs
TCSfunc
Figure 2. Operating principle of the trip circuit supervision (TCS) function
To avoid unnecessary alarms, the trip circuit supervision can be blocked by the BS
signal, which makes it possible to disable the supervision output when the circuit
breaker is withdrawn, i.e. when the four-pole status of both the circuit breaker and the
circuit breaker truck is undefined.
Moreover, to avoid unnecessary alarms, CMTCS_ should be blocked by the BS signal
when a trip signal initiated by a protection function block is activated.
The event E3 is not sent if the object is blocked in the initial condition (after reset).
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CMTCS_
2.3
Distribution Automation
Alarm acknowledgement
The ALARM output will reset automatically when the fault disappears or when the BS
signal is activated. The user cannot reset the output without disabling the function.
2.4
Resetting
The operation indications of the function block can be reset via the general parameter
F001V011 or the push-button C on the front panel of the MMI, which both affect all
function blocks.
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CMTCS_
Distribution Automation
3.
Parameters and events
3.1
General
• Each function block has a specific channel number for serial communication
parameters and events. The channel for CMTCS1 is 191 and that for CMTCS2
192.
• The data direction of the parameters defines the use of each parameter as follows:
Data direction
R, R/M
Description
Read only
W
Write only
R/W
Read and write
• The different event mask parameters (see section “Control settings”) affect the
visibility of events on the MMI or on serial communication (LON or SPA) as
follows:
Event mask 1 (FxxxV101/102)
SPA / MMI (LON)
Event mask 2 (FxxxV103/104)
LON
Event mask 3 (FxxxV105/106)
LON
Event mask 4 (FxxxV107/108)
LON
For example, if only the events E3, E4 and E5 are to be seen on the MMI of the
relay terminal, the event mask value 56 (8 + 16 + 32) is written to the “Event mask
1” parameter (FxxxV101).
In case a function block includes more than 32 events, there are two parameters
instead of e.g. the “Event mask 1” parameter: the parameter “Event mask 1A”
(FxxxV101) covers the events 0...31 and “Event mask 1B”(FxxxV102) the events
32...63.
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CMTCS_
Distribution Automation
3.2
Setting values
3.2.1
Actual settings
Parameter
Code
Values
Unit
Default
Data
Explanation
direction
Alarm delay
S1
0...300.000 s
3
R/W
Alarm delay
Activation
S2
0 or 1
1)
1
R/W
Activation of TCS function
Default
Data
Explanation
1)
3.2.2
Activation
-
0 = Inactive; 1 = Active
Control settings
Parameter
Code
Values
Unit
direction
Event mask 1
V101
0...15
-
10
R/W
Event mask 1 for event transmission
(E0 ... E3)
Event mask 2
V103
0...15
-
10
R/W
Event mask 2 for event transmission
(E0 ... E3)
Event mask 3
V105
0...15
-
10
R/W
Event mask 3 for event transmission
(E0 ... E3)
Event mask 4
V107
0...15
-
10
R/W
Event mask 4 for event transmission
(E0 ... E3)
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CMTCS_
Distribution Automation
3.3
Measurement values
3.3.1
Input data
Parameter
Code
Values
Unit
Default
Data
Explanation
direction
BS state
1)
3.3.2
I2
Blocking signal
0 or 1
1)
-
0
R/M
Blocking signal state
Data
Explanation
0 = Inactive; 1 = Active
Output data
Parameter
Code
Values
Unit
Default
direction
Alarm state
1)
3.3.3
O1
Alarm state
0 or 1
1)
-
0
R/M
Alarm state
0 = Inactive; 1 = Active
Events
Code
Weighting
Default
coefficient
mask
Event reason
Event state
E0
1
0
Trip circuit superv. 1 or 2 alarm
Reset
E1
2
1
Trip circuit superv. 1 or 2 alarm
Activated
E2
4
0
Trip circuit superv. 1 or 2 block
Inactive
E3
8
1
Trip circuit superv. 1 or 2 block
Active
9
CMTCS_
4.
Distribution Automation
Technical data
Alarm delay accuracy
The accuracy depends on the function block execution interval
(that can be selected) and the setting value (whether the setting
value is a multiple of the execution interval or not). The symbol
“Tex” denotes the execution interval in ms.
Alarm pulse delay:
± 2 % of set value or ±10 ms (if the delay is a multiple of
the execution interval)
± 2 % of set value or 0...Tex±10 ms (if the delay is not a
multiple of the execution interval)
Configuration data
Task execution interval (Relay Configuration Tool): 100 ms
at the rated frequency fn = 50 Hz
Technical revision history
10
Technical revision
Change
A
-
B
-