SQ 0204, SQ 0214 - synchroscope

SQ0214.jpg

Description

Features

Measurement of phase difference between bus bar and generator
Five instruments in one (SQ 0x14)
Circular display of δφ phase difference
Magnified display of phase difference δφ = +-20 degree
Microprocessor controlled
Simple synchronisation conditions setting
Output relay for synchronisation (pulse or permanent contact)
“Dead busbar” functionality
Power supply from bus bar or generator
Standard 96x96 mm or 144x144 mm din housing
LCD with backlight for voltage, frequency and/or δφ monitoring (sq 0x14 only)
High immunity to emc disturbances
Special functions set with three jumpers inside the instruments
Status output (option)
Green led for indication of both voltages
Lloyd’s and Bureau Veritas certificates (SQ 0204, SQ 0214, ship version)

Application

SQ 0204 and SQ 0x14 are microprocessor controlled synchronoscopes. They are availiable with or without LC-Display or output relay and can be used for manual or semi-automatic synchronisation processes. The internal output relay is activated, as soon as the prior adjustes synchronisation conditions are fulfilled. In addition the SQ 0x14 provides a LCD, which shows bus bar voltage U_BB and generator voltage U_GEN, as well as both frequencies f_BB and f_GEN or bus bar frequency f_BB and phase difference Δφ. Hence the SQ0x14 can replace two serperate voltmeters and two frequeny meters.

Function

The meter consists of 24 circular arranged LEDs, which show the actual phase difference Δφ with a resolution of 20°. Within the synchronisation range (between -20° and +20°) the resolution is higher (5° el. Grad). A frequency difference between the input voltages (U_GEN and U_BB) of more than 3 Hz is indicated through 3 blinking LEDs either in the FAST-range (f_GEN > f_BB) or in the SLOW-range (_fGEN < f_BB). When the synchronsiation conditions are fulfilled, the green SYNC-LED is lit. A red ΔU-LED is lit, when the voltage difference is exceeding the predefined value. Three potentiometers adjusting of the synchronisation conditions can be found on the back of the meter:

Permissible phasen difference Δφ
Permissible voltage difference ΔU
Switching delay for the relay

The relay is fired (impulse or permanent contact), when the phasedifference and the voltage difference remain within the defined values for the duration of the defined switching delay. As soon as one value exeeds the conditions, the permanent contact is open immediatly. the activation of the relay is indicated by the SYNC-LED on the meter.

The synchronoscopes are availiable:
Without relay
With relay (impulse- or permanent contact)
With “dead bus bar”-function
the output relay can additionally be activated, when the generator voltage is higher than 80% of the nominal voltage un and the bus bar voltage ubb is below the defined offset value. The default offset value is 20% of the nominal value.
With „dead bus bar" and "dead generator“-function
the relais can additionally be activated, when one if the voltages (U_bb or U_gen) is higher than 80% of the nominal voltage un and the according other voltage(ubb or ugen) is lower than the defined offset value.
With status output (optional)
the status output (open collector) monitors the microprocessor system. In case of an micro processor error this output has a high resistance.

The SQ 0x14 shows on its display two voltages (U_BB, U_GEN) and two frequencies (f_BB, f_GEN). If the difference between f_BB and f_GEN is less than 0.02 Hz, the phase difference Δφ will be displayed.

ordering code

Downloads

en-List-7-Analogue-Panel-Meters.pdf