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Transformer Differential Protection
RZL-05.T2, RZL-05.T3

Application

Microprocessor devices of RZL-05.T series are intended to perform differential protection of two-winding and three-winding power transformers with 35 - 110 kV HV winding. Devices are to be mounted in relay sections of switchgears and also relay panels and substation control boards.

Download the catalog. Relay Protection and Automation Devices.

Features

Two differential protection zones: differential current cutoff without restraining and sensitive differential current protection restrained in case of external fault out of protection area and from magnetising inrush current.
Current circuits performance supervision production blocking in case of loss.
Five-stage overcurrent protection including current cutoff with magnetizing current inrush restriction, current overload protection with the definite and independent time-delay. For overcurrent protection stages available an option of voltage controlled start.
Logical selectivity busbar protection.
Three-stage ground fault protection of HV winding. Zero-sequence fault current may be measured or calculated.
Phase loss protection (negative-sequence) current protection.
Logics of internal transformers protection performance. Each internal protection command might be configured to trip or to initiate an emergency alarm.
Light-sensor arc fault protection.
Breaker failure protection.
User-defined programmable logic.
Solid ambient conditions withstand (-40...+55 °C).
Multi-lingual LCD interface: English, Ukrainian, Russian.

RZL-05.T - restraining curve — **Restraining curve of differential protection**

Technical parameters

Parameters	RZL-05.T2 -		RZL-05.T3 -
Parameters	1	5	1	5
Power supply units parameters
Operating voltage range, DC / AC, 50 Hz	90 – 360 V / 80 – 254 V
Power-on availability time	0,3 s
Operating supply interruption	0,5 s
Independent supply channels (auxiliary voltage circuits)	2
Device burden	2x13 Wt
Current input parameters
Rated input current	5 A
Line current inputs number	6		9
Measurable current range	0,3 - 125,0 A
Maximum monitored current value	150 A
Basic relative measurement accuracy	±2 %
Current thermal withstand, continuous / 1 s	10 / 500 A
Zero-sequence current input parameters
Rated zero-sequence input current (3Io)	1 A	5 A	1 A	5 A
Line current inputs number	1
Measurable current range	0,01 - 2 A	0,5 - 125 A	0,01 - 2 A	0,5 - 125 A
Maximum monitored current value	10 A	150 A	10 A	150 A
Current thermal withstand, continuous / 1 s	5 / 100 A	15 / 500 A	5 / 100 A	15 / 500 A
Voltage input parameters
Phase voltage	100 V
Number of inputs	4
Rated voltage range	1 - 150 V
Maximum controlled voltage	200 V
Linear voltages measurement accuracy	±2 %
3Uo voltage measurement accuracy	±3 %
Voltage thermal withstand, continuous /1 s	150 / 300 V
Measurement accuracy of phase angles between current 3Іо and voltage 3Uо	±3 deg
Thermal sensor input parameters
Number of inputs	1
Temperature range	0- 100 °C
Binary input parameters
Number of inputs	9		17
Rated AC, DC voltage	220 V
Response voltage level	132 - 176 V
Response time	not less 40 ms
Current consumption at 220 V: - power-on current - continuous	20 mA 4 mA
Maximum voltage, continuous	310 V
Dry contact binary input parameters
Number of inputs	13		17
Dry contact circuits source voltage	DC 24 V
Binary output parameters
Number of binary outputs	13		17
Max AC voltage trip	400 V
Maximum AC current	5 A (10 A for K1 output)
Max DC voltage trip	300 V
Maximum DC LR-circuit trip current, time constant τ≤20 ms	0,2 A (0,4 A for K1 output)
Arc fault protection sensors parameters
Number of inputs	3
Response threshold	900 – 1700 lux
Communication
PC communication interface	USB - 1 pcs
Automated Control System communication interface	RS-485 - 2 pcs
Data Protocol	MODBUS RTU
Connection speed	9600...115200 bps
Other
Mounting type	Flush
Device dimensions (WxHxD)	205x240x195 mm		265x240x195 mm
Weight, less then	6,5 kg		10 kg
LED indicators total / configurable	20 / 16
Operating ambient temperature range	- 40 to + 55 °C
Maximum Humidity at 25 °C	98 %
Insulation resistance, more than	50 MΩ
Insulation overvoltage withstand, Instantaneous / continuous	2,0 kV , 50 Hz 5,0 kV pulse

Wiring Diagram example

RZL-05.DP-13 - wiring diagram — Wiring diagram of external circuits to the devices **RZL-05.T3-5**

Dimensions