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Advanced Protection and Control Devices
for Substations and Switchgears 1 - 45 kV
RZL-05.A

Application

New modified electronic microprocessor devices series RZL-05 are used for protection, automation, control and monitoring of power distribution network elements. Devices are the most suitable for incoming / outgoing feeder (RZL-05.Ax B) and busbar section coupler (RZL-05.Ax BS) bays of 1 - 45 kV distribution networks.

Devices can be installed in relay cubicles of switchgear bays.

Download the catalog. Relay Protection and Automation Devices.

Features

Protection, automation and control of an intended network elements;
Operating parameters settings via built-in HMI and PC software tool: functions activation/deactivation, protection stages values and time delay for each stage etc.;
Three photosensor inputs of arc-fault protection;
Each photosensor input independent configuration;
Fault recorder and event log;
Total fault record duration over 600 s;
A solid number of inputs, outputs and indicating LEDs;
Flexible configuration settings;
Non-volatile storage of setting, events, fault recordings;
Data transfer including current parameter and function settings, apparatus state, events, measurements;;
Remote control functions;
Wire connection terminals with end-position locking plug;
Steel casing;
Front side USB interface;;
Two RS-485 interfaces of MODBUS data transfer protocol;
Real-time self-supervision;
Self-blocking on internal failure to prevent false operations;
Two mutually redundant power supply units;
Optional current circuits low-burden redundant power supply;
AC/DC power supply source;
Binary inputs optocoupler isolations;
Supply inputs and all signal circuits are galvanically isolated;
Solid overvoltage withstand;
Solid ambient conditions withstand;

Technical parameters

Power supply units parameters
Operating voltage range, DC or AC	90 - 254 V
Power-on availability time	0,19 s
Operating supply interruption	0,5 s
Independent supply channels (auxiliary voltage circuits)	2
Device burden	10 Wt
Supply from current transformer circuits (optional)	2
Continuous current withstand	2,5 - 20,0 A
Current input parameters
Rated input current	5A
Line current inputs number	3
Measurable current range	0,3 - 200,0 A
Current thermal withstand, 1 s	10 (500) A
Rated zero-sequence input current (3Io)	1 A
Measurable current 3Io range	0,01 - 4,00 A
Voltage input parameters
Phase voltage	100 V
Number of inputs	3
Rated voltage range	1 - 150 V
Maximum continuous voltage	130 V
Thermal sensor input parameters
Number of inputs	1
Temperature range	0 - 125 °C
Communication
USB interface	1
RS485 interface	2
Data protocol	Modbus RTU
Connection speed	9600, 19200, 38400 kbps
Binary input parameters
Numbers of inputs	17
Rated AC, DC voltage	230 V
Response voltage level	132 - 176 V
Response time	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	3
Dry contact circuits source voltage, DC	24 V
Binary output parameters
Number of binary outputs	17
Maximum DC voltage trip	300 V
Maximum AC voltage trip	400 V
Maximum AC current	8 A (16 A for K1 output)
Maximum DC LR-circuit trip current, time constant τ ≤ 20 ms	0,3 A (0,6 A for K1 output)
Other
Mounting type	Flush
Device dimensions (WxHxD)	265x240x190 mm
LED indicators total / configurable	20/8
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	5 / 2 kV
Weight, less then	10 kg

Function

Function	ANSI	RZL-05.Ax B				RZL-05.Ax BS
Protection		1	2	3	4	1	2	3	4
Overcurrent (OCP)	50/51	•	•	•	•	•	•	•	•
Voltage-restrained OCP	50V/51V	•	•	•	•	•	•	•	•
OCP stage blocking by binary input		•	•	•	•	•	•	•	•
Directional OCP	67	•	•	•	•	•	•	•	•
Negative-sequence overcurrent	46	•	•	•	•	•	•	•	•
Switch on to fault high-speed protection	50HS	•	•	•	•	•	•	•	•
Logic Selectivity Busbar protection	68	•	•	•	•	•	•	•	•
Zero-sequence OCP (unidirectional ground-fault protection)	50N/51N	•	•	•	•
Directional ground-fault protection (directional zero-sequence power protection)	67N	•	•	•	•
Zero-sequence overvoltage protection	59N	•	•	•	•	•	•	•	•
Overvoltage protection	59	•	•	•	•	•	•	•	•
Undervoltage protection with a current-permissive instance	27	•	•	•	•	•	•	•	•
Negative-sequence overvoltage protection	47	•	•	•	•	•	•	•	•
Phase conductor break protection (negative sequence or negative to positive sequence ratio cirrent)	46BC	•	•	•	•	•	•	•	•
OCP/zero-sequence OCP stage activation by binary signal (current-restrained intertrip)		•	•	•	•	•	•	•	•
ARC-fault protection (3 optofibre sensor inputs)				•	•			•	•
Overtemperature protection		•	•	•	•	•	•	•	•
Automation functions
Auto-reclosing	79	•	•	•	•
Automatic underfrequency load shedding	81L	•	•	•	•
HV Breaker failure back-up	50BF	•	•	•	•	•	•	•	•
Automatic load transfer		•	•	•	•	•	•	•	•
Automatic initial scheme restore		•	•	•	•	•	•	•	•
Monitoring and indication functions
Breaker closing circuits supervision	74TCS	•	•	•	•	•	•	•	•
Temperature monitoring via thermal sensor	38/49T	•	•	•	•	•	•	•	•
Protection operation alarm lockout (LED and output state save until manual reset)		•	•	•	•	•	•	•	•
Internal malfunction alarm	30	•	•	•	•	•	•	•	•
Voltage transformer secondary circuits supervision		•	•	•	•	•	•	•	•
Parameter setting groups switch on binary input activation/deactivation		•	•	•	•	•	•	•	•
Service functions
Non-volatile memory event log		•	•	•	•	•	•	•	•
Non-volatile memory fault recorder with 600 s total record duration		•	•	•	•	•	•	•	•
Fault recorder on binary input activation		•	•	•	•	•	•	•	•