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General| Brand | ABB |
|---|---|
| Model | PR521 |
| Category | Computer Hardware |
| Language | English |
Ensure suitable installation room conditions for electrical and electronic apparatus.
All installation, service, and maintenance must be by qualified personnel.
Adhere to standard and legal requirements for installations and safety.
Follow manual instructions and pay attention to specific symbols.
Check that the apparatus's rated performance is not exceeded during service.
Ensure personnel have access to the manual and necessary information.
Use only original spare parts for maintenance and replacement.
Disconnect the PR521 unit before performing insulation tests.
Emphasizes responsible behaviour for overall safety.
Information for PR521 unit installation and service.
Careful reading recommended for correct product use.
Standard packing protects the unit; contact ABB for special requirements.
Check apparatus for integrity and report any damage within five days.
Lists accompanying documents for the protection unit shipment.
Unpack and check unit; repack using original material if not installed immediately.
Store in a dry, dust-free, covered area within a specified temperature range.
PR521 integrated with HAD circuit-breakers, supports ANSI functions (50-51-51N).
Protections can be two or three-phase based on C.S. connection.
Unit is self-powered and operates with >=20% rated C.S. current.
Lists relevant IEC, CEI, and EN standards.
Specifies ambient operating and storage conditions.
Details mechanical dimensions, weight, IP rating, and MTBF.
Specifies switching capacity, voltage, current, and lifespan.
Correct installation is critical; must be done by qualified personnel.
Disconnect the PR521 unit before insulation testing.
Unit is mounted on HAD circuit-breakers and supplied by C.S.
Connects to circuit breaker terminals for remote control and toroidal transformer.
Refer to circuit-breaker manual for terminal board access.
Programming by qualified personnel; disconnect before insulation tests.
Adjust 51/51N functions based on circuit-breaker's rated current capacity.
C.S. provide energy and signal for current detection.
Unit supports four different C.S. rated values (40, 80, 250, 1250 A).
Illustrates dip switch position indication.
Explains how PR521 processes current (RMS and Peak values).
Uses 4 dip switches to select C.S. type.
Warning for setting multiple C.S. types simultaneously, affects alarm LED.
Protection and trip functions are guaranteed regardless of C.S. setting.
Lists overcurrent (51) and short-circuit (50) protection functions.
Details the overcurrent protection function and its 4 curve families.
Indicates S1-S4 curves for future use; standard version selects one of four.
Uses 5 dip switches to set the threshold value for I>.
Lists 32 threshold values from 0.2 to 1 x In.
Protection cannot be excluded, ensuring self-protection against overloads.
Specifies tolerance for I> thresholds according to IEC 255-3.
Uses 2 dip switches to select one of four time-current relationships.
Defines Fixed Time-Delay curve parameters and dip switch settings.
Defines Normally Inverse curve parameters and dip switch settings.
Defines Very Inverse curve parameters and dip switch settings.
Defines Extremely Inverse curve parameters and dip switch settings.
Uses 4 dip switches to adjust trip time by setting K value.
Lists 16 available K values from 0.1 to 1.6.
Specifies tolerances for trip times based on curve type.
Provides an example of setting overcurrent protection characteristics.
Example for setting overcurrent protection with specific parameters.
Shows the dip switch configuration for the example setting.
Describes protection indicated by I>> with adjustable trip time t>>.
Uses 4 dip switches to set the threshold value for I>>.
Lists 14 thresholds; protection can be excluded.
Specifies tolerance for I>> thresholds.
Uses 3 dip switches to set trip time t>>.
Lists 8 trip times from 0.1 s to 0.8 s.
Specifies tolerance for trip time t>>.
Example for setting selective short-circuit protection.
Shows dip switch configuration for the example setting.
Provides instantaneous definite time-delay thresholds indicated by I>>>.
Uses 4 dip switches to set the threshold value for I>>>.
Lists 15 threshold values and their tolerances.
Provides an example of setting instantaneous short-circuit protection.
Illustrates the front nameplate of the PR521 unit.
Explains the function of each element on the front nameplate.
Unit performs 50-51 functions plus earth fault 51N.
Explains methods for determining earth fault current (internal/external toroidal).
Lists overcurrent, short-circuit, and earth fault protection functions.
Details protection using internal toroidal transformer.
Uses 4 dip switches to set threshold value for lo>.
Lists 14 threshold values from 0.45 to 1.10 x In.
Uses 4 dip switches to adjust trip time (0-0.75s).
Shows possible setting values for trip time (to>).
Conditions for lo> activation and inhibition based on current.
Specifies tolerance for trip time.
Example for setting earth fault protection with internal toroidal transformer.
Shows dip switch configuration for the example.
Details protection using external toroidal transformer.
Uses 4 dip switches to set threshold value for lo>.
Lists 14 threshold values from 0.05 to 0.70 x In.
Specifies tolerance for lo> thresholds.
Uses 4 dip switches to set trip time (to>).
Refers to section 6.3.1.1.2 for trip time settings.
Conditions for lo> activation and inhibition.
Specifies tolerance for trip time.
Example for setting earth fault protection with external toroidal transformer.
Shows dip switch configuration for the example.
Illustrates the front nameplate of the PR521 unit.
Explains the function of each element on the front nameplate.
Integrated relay provides protection tripped signal.
Describes automatic and manual reset methods for the relay signal.
Yellow LED indicates timing or C.S. setting errors.
Table shows LED status based on error and timing conditions.
Enables remote opening of circuit-breaker via demagnetisation release.
Specifies conditions for remote opening command execution.
Details cable length and type for electromagnetic compatibility.
Function availability and non-impact on signalling relay.
Operations by qualified personnel; disconnect before insulation tests.
At least the described test must be performed before service.
Verifies microcontroller and demagnetisation release functionality.
Recommends repeating the test annually.
Lists PR521, demagnetisation release Y03, and Test Device TT2.
Advised to provide serial numbers when ordering parts.
TT2 accessory for PR521/PR512 performs signal reset and release test.
Details TT2 unit settings, battery check, and dip switch usage.
Shows the Definite Time-delay trip curve for overcurrent protection.
Shows the Normally Inverse time-delay trip curve for overcurrent protection.
Shows the Very Inverse time-delay trip curve for over-current protection.
Shows the Extremely Inverse time-delay trip curve for over-current protection.
Shows the definite time-delay trip curve for short-circuit protection.
Shows the definite time-delay curve for internal earth fault protection.
Shows the definite time-delay curve for external earth fault protection.
Refers to document 'Circuit diagram n° 401701' for detailed information.
Provides wiring diagrams for the PR521 unit.
Shows connector details and important warnings.
Details connections for XK1, XK2, and XK3 terminals.
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