
1.1 Overall Operation
19
7UM61 Manual
C53000-G1176-C127-3
tion is possible as well). The 4th voltage input is for displacement voltage measure-
ment for stator earth fault protection.
The IA input amplifier group allows high impedance connection for analog input values
and contains filters optimized for measured value processing bandwidth and speed.
The AD analog digital converter group contains high resolution
Σ∆
digital converters
(22 bits) and memory components for data transfer to the microcomputer.
Microcomputer
System
The implemented software is processed in the microcomputer system (
µ
C). Essential
functions are:
• Filtering and conditioning of the measured signals,
• Continuous monitoring of the measured quantities
• Monitoring of the pickup conditions for the individual protective functions
• Querying of limit values and time sequences,
• Control of signals for logical functions,
• Decision for trip commands
• Signalling of protection behaviour via LEDs, LCD, relays or serial interfaces
• Storage of indications, fault data and fault values for fault analysis,
• Management of the operating system and its associated functions such as data re-
cording, real-time clock, communication, interfaces, etc.
Adaptation of Sam-
pling Frequency
The frequency of the measured quantities is continuously measured and used for ad-
justing of the actual sampling frequency. This ensures that the protection and mea-
surement functions produce correct results over a wide frequency range. This ensures
measuring accuracy in the frequency range from 11 Hz to 69 Hz.
The sampling frequency adaptation can, however, operate only when at least one a.c.
measured quantity is present at one of the analog inputs, with an amplitude of at least
5 % of rated value (“operational condition 1”).
If no suitable measured values are present, or if the frequency is below 11 Hz or above
70 Hz, the device operates in mode “operational condition 0”.
Binary Inputs and
Outputs
Binary inputs and outputs from and to the computer system are routed via the I/O
modules (inputs and outputs). The computer system obtains the information from the
system (e.g remote resetting) or the external equipment (e.g. blocking commands).
Outputs are mainly commands that are issued to the switching devices and messages
for remote signalling of events and states.
Front Elements
Optical indicators (LEDs) and a front display panel (LC display) provide information on
the function of the device and indicate events, states and measured values. Integrat-
ed control and numeric keys in conjunction with the LCD facilitate local interaction with
the device. By this means all information on the device such as design and setting pa-
rameters, operation and disturbance indications and measured values can be queried,
(see also SIPROTEC
®
System Description /1/), and setting parameters can be
changed.
www
. ElectricalPartManuals
. com
Содержание Siprotec 7UM611
Страница 16: ...Contents 16 7UM61 Manual C53000 G1176 C127 3 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 232: ...2 Functions 232 7UM61 Manual C53000 G1176 C127 3 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 292: ...3 Mounting and Commissioning 292 7UM61 Manual C53000 G1176 C127 3 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 410: ...A Appendix 410 7UM61 Manual C53000 G1176 C127 3 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 412: ...Literature 412 7UM61 Manual C53000 G1176 C127 3 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...