hobut protection relays : synchronising check

The M200-PLL & PLD are synchronised check relays, also known as paralleling relays. They are used to ensure that two AC supplies are synchronised, frequency, phase angle and voltage have to be within preset limits. The M200-PLL can monitor either main bus bar and incoming generator, or two generators. The PLL has customer adjustment of the vifferential voltage of between 10 to 30%. This voltage corresponds to 6 to 20 electrical degrees. The unit compares the input voltage and phase relationship of the bus bar as to that of the generator, when the signal is within preset limits, the relay energises. The M200-PLD operates as the M200-PLL but has the additional feature of the dead bus facility. This enables the relay to energise with a generator supply only, which is a common requirement where mains failure occurs.

INPUT
Rated value Un:	57.8 < 500V ±25%
Frequency:	50 / 60 / 400Hz
Burden:	< 4VA terminals marked GEN<2VA terminals marked BUS
Overload:	1.5 x continuous 10 x Un for 3 seconds
SETPOINT
Range:	Adjustable 10% to 30% of nominal system voltage (6-20 electrical degrees)
Repeatability:	Better than 0.5% of span
Differential:	Fixed at 5%
Operating time:	Typically 500mS
AUXILIARY
Both units are self powered
WEIGHT&CASE	Approx 0.6kg. 100mm case

M200-PLL	1 generator 1 bus or 2 generators
M200-PLD	1 generator 1 bus with dead bus facility
Both units can be used on single or 3 phase systems.

Product Code	System Voltage	Frequency	Options
M200-PLD	400V	50Hz	Cal at 35ºC