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| Motor
Protection |
Transformer
Protection |
Power
Generation Protection |
| STR 49-50-51R-46-37-66-50N-51N |
SSG 50-51-67-50N-51N-59N-67N |
NTG |
| SVR 27-59-59N-27P-47-27T-59T |
SKC 49-50-51-50N-51N-87-87N |
SKC 49-50-51-50N-51N-87-87N |
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SIG 50-51-50N-51N |
SCF 25 |
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SHG 50-51-50N-51N |
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STR - Microprocessor-based
relay for motor protection 49-50-51R-46-37-66-50N-51N
Description
The relay STR is intended for the complete protection of high power motors with
medium voltage or low voltage supply. Several protection functions incorporated in a
single relay assure the protection of the motor against all the different fault
conditions; overheating caused by mechanical overload or by an abnormal supply, locked
rotor, too long starting, interruption of one phase conductor, current unbalance, short
circuit between phases, short circuit between turns, earth fault, underload running, too
frequent startings.
Characteristics
The relay STR features the following principal characteristics:
 | three input measuring circuits for the line currents |
| measuring circuit, provided with a band pass filter for residual current |
| protection functions and final relays completely programmable by user |
| direct read-out of all quantities by means of digital display on the front panel |
| counting of the number of operations performed by each function |
| storing the values of input quantities corresponding to the last operation |
| optional blocking circuit to perform accelerated protection schemes |
| serial communication circuit |
| continuous monitoring of internal circuits |
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SVR 27-59-59N-27P-47-27T-59T
Microprocessor-based relay for voltage protection
DESCRIPTION
The relay type SVR is intended for the protection of electric lines and machines against voltage variations. The following protection and monitoring functions are available, all with independent time delay:
undervoltage protection (27),
overvoltage protection (59),
residual voltage protection (59N) against earth faults (available upon request),
positive sequence undervoltage protection (27P),
negative sequence overvoltage protection (47),
dead line monitoring (27T),
live line monitoring (59T).
The relay SVR features the following principal characteristics:
* three-phase measuring circuit for the line voltage, with star or delta connection;
* measuring circuit, provided with a band pass filter, for the residual voltage;
* protection functions and final relays completely programmable by the user;
* direct read-out of all the input quantities by means of digital display on the front panel;
* counting the number of operations for each function;
* storing the values of input quantities corresponding to the last operation;
* optional digital input circuit, to perform adaptive protection schemes;
* serial communication circuit;
* continuous monitoring of internal circuits.
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SSG
50-51-67-50N-51N-59N-67N
Feeder directional/non directional phase and earth overcurrent digital relay
DESCRIPTION
The relays type SSG are intended for the protection against overloads, short circuits and earth faults in radial networks, ring mains or variable structure networks.
The relay features the following characteristics:
* directional and not directional functions for both overcurrent and earth fault protections;
* phase lock loop circuit with memory of the reference voltage for the directional functions (67);
* protection functions and final relays fully programmable;
* selectable operation curves with independent or dependent time both for the overcurrent and for the earth fault functions;
* direct read-out of all the input quantities by means of digital display on the front panel;
* counting of the number of operations performed for each function;
* counting of the cumulative switched currents for each pole of the circuit breaker;
* storing the values of input quantities corresponding to the eight last operation and trace memory, triggered when trip occours, with pre and post-trigger;
* blocking circuit, to perform accelerated protection schemes;
* optional digital input circuits;
* continuous monitoring of internal circuits;
* real time clock with memory backup;
* serial communication circuit RS485 with MODBUS RTU protocol.
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SIG 50-51-50N-51N Phase and earth overcurrent digital relay
DESCRIPTION
The relay type SIG is intended for the protection of electric lines and machines against overloads, short circuits and earth faults.
The relay SIG features the following principal characteristics:
* three input measuring circuits for the line currents;
* measuring circuit, provided with a band pass filter, for the residual current;
* protection functions and final relays completely programmable by the user;
* selectable operation curves with independent or dependent time as well for the overcurrent as for the earth fault function;
* direct read-out of all the input quantities ;
* counting of the number of operations performed for each function;
* counting of the cumulative switched currents for each pole of the circuit breaker;
* storing the values of input quantities corresponding to the eight last operations (START or TRIP) and trace memory with pre and post-trigger (2.5 + 2.5s);
* two different setting configuration;
* blocking circuit, to perform accelerated protection schemes;
* digital input circuits;
* serial communication circuit RS485 with MODBUS® RTU protocol;
* trip circuit supervision (TCS);
* breaker failure protection (BF);
* programmable disablement on lighting with programmable time setting;
* real time clock with memory backup;
* continuous monitoring of internal circuits.
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SKC 49-50-51-50N-51N-87-87N
Microprocessor-based current differential relay with overcurrent, earth fault and thermal elements
DESCRIPTION
The differential current relays type SKC is intended for the protection of generators, large motors, two winding power transformers and short lines. The following functions are provided:
thermal (49) for transformer programmable on one of the two sides;
overload (51) and short circuit (50) independently programmable on both sides;
earth fault (50N-51N) or restricted earth fault (87N);
biased differential function for transformers with second and fifth harmonic restraint (87T);
biased differential function for motors, generators, and short lines (87G).
The relay SKC feature the following characteristics:
* seven current inputs, where six are provided for current phase measurements and the last one dedicated for residual current measurement;
* internal compensation of phase shift and ratio matching for transformers differential function (87T); conventional external compensation can also be selected with external CT's;
* stabilizing circuit with dual slope with variable bias makes the differential functions of SKC relay insensitive to external fault (87T, 87G);
* second and fifth harmonic restraint stabilization with strong magnetizing inrush currents and overexitation condition (87T) based on numerical processing of differential current (DFT algorithm);
* alernative set thresholds for 49-50-51-50N-51N/87N protection functions which are automatically enabled upon detection of high second harmonic above a programmable set-point to prevent tripping for transformer energization (inrush);
* earth fault protection insensitive to thirth and higher harmonic components;
* selectable operation curves with independent or dependent time (first thresholds) for overcurrent and earth fault functions;
* trip counting performed for each function;
* shorting values of input quantities corresponding to the four last operations (START or TRIP) and trace memory with pre and post trigger;
* four final relays, independently programmable as energized/de-energized and latched/no-latched;
* three signalling LEDs (ON,TRIP,ALARM);
* two digital inputs circuits;
* double set-point groups (bank A and bank B)
* blocking circuits to perform accelerated protection schemes either with programmable logic from internal funtions with block circuits of external protection relays;
* trip circuit supervision (TCS)
* breaker failure protection (BF)
* serial communication circuit RS485 with MODBUS RTU protocol;
* real time clock with memory backup;
* continuous monitoring of internal circuits ;(SELF TEST).
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NTG Generator multifunction protection relay
DESCRIPTION
The NTG digital protection relay integrates a number of functions required for the protection of generators. It is used in power stations from gas, steam, hydraulic turbine, or diesel driven generators, operating in parallel with the public grid and/or in isolation and with any neutral state and grid layout.
According to the hardware configurations BASIC and PRO, the NTG protection relay can be shipped with different sets of protection functions.
NTG performs the following protection functions:
21-51V Underimpedance or Voltage-controlled overcurrent protection
24 Overexcitation (V/Hz)
26 Thermal protection by 8 PT100 thermometric probes
27 Undervoltage
27H-59H Third harmonic Under/Overvoltage (100% stator ground)
32 Directional power
32R Reverse power
37P Underpower
40 Loss of Field
46 Negative sequence overcurrent
49 Thermal overload
50/51 Overcurrent
50+27 Switch onto standstill (InadvertentEnergizing)
50G/51G-87N Neutral overcurrent (90% stator ground in current) or, alternatively, high impedance restricted earth fault.
59 Overvoltage
59N Neutral overvoltage (90% stator ground in voltage)
64F Rotor ground
81> Over frequency
81< Under frequency
BF Breaker failure
74CT Phase CT monitoring
74VT Line VT monitoring
74TCS Trip circuit monitoring
The key features for Monitoring, Metering and Automation are:
Metering of all the generator electrical quantities
Frequency tracking within the generator frequency range 20...80 Hz
Circuit Breaker monitoring and diagnostics
Firmware Updating
Two setting parameter groups for all the relay protection function
Logic selectivity
Sequential trip logic
Sequence of events logging
MODBUS TCP/IP communication interface through copper (RJ45) or fibre-optic (FX) connections
Extensive I/O: up to 16 logical input, 16 output relays, 24 signalling LED
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SCF - Microprocessor-based
synchronising relay 25
Description
The relay type SCF is
intended for synchronising of generator units and paralleling to the network. Several
functions which are necessary to carry out the paralleling are accomodated in a single
relay. The design is based on a microprocessor to assure a high degree of adaptivity and
ease of use.
Characteristics
The SCF relay features the following principal characteristics:
| possibility to control both frequency and voltage of the interested machine |
| setting of the operative parameters by means of membrane front keyboard |
| direct read-out of all measured quantities and operative parameters by means of
digital display on the front panel |
| high effectiveness and hence fast operation due to digital processing of the
input quantities |
| serial communication circuit |
| high reliability assured by suitable checking actions and continuous monitoring
of internal circuits |
| possibility to use a single relay as well as for installations with several
generators |
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