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Relay Protection Devices for 6 - 35 kV Distribution Networks
RZL-01

Application

The microprocessor relay protection device RZL-01 is designed to perform the functions of relay protection, automation, control, registration and alarms of:

cable and overhead 6-35 kV lines;
backup power transformer protection and others.

The device is designed for installation in relay sections and compartments of switchgears, in control panels and boxes located in the relay halls and on the control desks of power substations 6-35 kV.

The device can be used for protection of distribution networks elements as an independent device, and in combination with other devices of relay protection and control systems.

Download the catalog. Relay Protection and Automation Devices.

Features

Performance of protection functions, automatics and control, complies with regulations requirements
User-defined variable internal configuration (binary inputs, outputs and LEDs)
Configuration setting via human-machine interface and/or software tool included
Entering and saving settings of protection and relay control devices
Free assignment of LED indicators for displaying status of binary inputs, starts/operation of the overcurrent protection / ground fault protection (OCP/GFP), re-closure failure, OCP acceleration, and other service functions
One current-time responsible OCP stage
Configurable binary outputs for protection start/operation functions of OCP/GFP, automatic reclosing, circuit breaker failure backup, busbar lockout protection
Free configurable 16 channels of event logging (logic functions and binary input/output state)
Remote control, measuring, alarm signalization, entry and change of settings via communication lines
Self-supervision (watchdog) and self-blocking on failure
Opto-coupler binary inputs insulation

Protection functions

Each OCP stage acceleration on CB closing operations
Single-stage non-concentrated GFP protection
Busbar instantaneous protection lockout
Interconnecting of external protection

Automation function

CB operation on external commands
Single/double automatic re-closing after OCP/GFP operation, external protection command on binary input (IN). Reclosing operation on the certain OCP stages
CBFP on designated overcurrent stages by "Working GFP" signal, by external signal from designated binary input (IN)

Additional service functions

Built-in clock and calendar
Measurement of phase currents and zero sequence current 3I0, and their primary/secondary value display
Digital fault recorder with non-volatile memory
Event log
Statistics register
Multi-lingual LCD interface: English, Ukrainian, Russian

Technical parameters

Rated input signals, auxiliary power supply
Rated input phases current In / zero-sequence current 3I₀ In_3I₀	5 A or 1 A / 1 A
Voltage range (DC or AC)	90-250 V AC/DC, 45-55 Hz
Powerconsumption + per each binary output energized	5 V·A + 0,4 V·A
Instantaneous current inrush on energize (10 μs)	10 A
Operating supply interrupt duration	500 ms
Self-test availability time: - Auxiliary voltage supply - Current circuits supply	50 ms 150 ms
Self-test duration	250 ms
Backup supply from current circuits (RZL-01.02, RZL-01.03)
Minimum / Rated / Continuous current	4 A / 5A / 20 A (4 In)
Voltage input power	2,5 V·A
Maximum analog input power	12 V·A
Three-stage overcurrent protection /OCP/
Current setting range	0,1 — 25 In, step 0,1 A
OCP time-delay instance setting range	0 — 32 s, step 0,05 s
OCP acceleration instance setting range / OCP setting time	0 — 5 s / 0 — 5 s, step 0,1 s
Non-directional ground-fault protection /GFP/
Current instance setting range	0,01 - 1 A, step 0,01 A
Time-delay setting range	0 — 32 s, step 0,05 s
Auto-reclosing /AR/
1st and 2nd ARC cycles time-delay setting range	0,8 — 600,0 s, step 0,1 s
Next ARC cycle availability time range	0,9 — 600,0 s, step 0,1 s
AR preparation time	30 — 600,0 s, step 0,1 s
Breaker failure back-up
Current instance setting range	0,1 — 25 In, step 0,1 A
Time-delay setting range	0,1 — 4,0 s, step 0,1 s
Binary inputs
RZL-01.01, RZL-01.02, RZL-01.03 voltage activation binary inputs with opto-coupler insulation	6
RZL-01.02 D2, RZL-01.03 D2 voltage activation binary inputs with opto-coupler insulation dry contact binary inputs (galvanically connected with power supply circuits)	4 2 (inputs D5, D6)
RZL-01.02 D3, RZL-01.03 D3 voltage activation binary inputs with opto-coupler insulation dry contact binary inputs (galvanically connected with power supply circuits)	3 3 (inputs D4, D5, D6)
RZL-01.02K1 voltage activation binary inputs with opto-coupler insulation	5
Input-to-output command transfer time-delay setting range (for each input)	0 — 32,0 s
Control voltage DC Un	220 V (110 V*) U«1» > 0,6Un; U«0» < 0,4Un
Control voltage AC 50 Hz Un	220 V (110 V*) U«1» > 0,8Un; U«0» < 0,45Un
Dry contact inputs internal supply module voltage	310 V (154 V) DC *
Operation threshold deviation	±0,1·Un
Input resistance	50 kOhm
Binary outputs
Number of programmable outputs - NO+NC contact / - NO contact	1 / 4 (1 / 3 - in RZL-01.02K1)
Internal fail signal output, switch contact	1
Switching ability of relay contacts - Maximum tripping AC voltage / current / power (cosφ=0,6) - Maximum turn-on DC voltage / current / (τ=30 ms) - Maximum DC tripping power - Rated continuous AC/DC current	220 V, 5 A, 1000 VA (cosφ=0,6) 250 V / 0,4 A 30 Wt 8 A
Insulation parameters
Current inputs insulation to coating and voltage inputs between inputs and input to the ground	AC 2000 V, 50 Hz, 1 min
The rest, galvanically isolated. circuits (except for the closing of the relay contacts)	AC 1500 V, 50 Hz, 1 min
Outputs of NO contacts of electromagnetic relays	AC 500 V, 50 Hz, 1 min
Short-time thermal resistance of current circuits
RZL-01.01: during 1 sec / 60 sec	80·In / 8·In
RZL-01.02 and RZL-01.03: during 1 sec / 60 sec	50·In / 4·In
Device surge, static electicity, disturbance withstand performed by GOST 29280 (EN61000-4-2 - EN61000-4-11)
Analog inputs withstand: - voltage surges (three positive, three negative)	5kV, 1,2/50 μs, 3 "+", 3 "-"
- high frequency disturbance (maximum instantaneous vakue): longitude / transverse	2,5 kV / 1,0 kV
- operating supply interrupt duration	500 ms
Operating ambient temperature range Storage and transportation	UHL4: -20°C ... +55°C, UHL3.1: -40°C ... +70°C
Communication
Protocol	Modbus RTU
Interfaces / Connection speed	RS485 / 9600 / 19200 / 38400 bps RS232 / 19200 bps

* Also available modification with binary inputs control voltage 110 V (to be specified in order list).
** Binary inputs D4, D5, D6 for modifications RZL-01.xx D2/D3 are supplied from an internal power module and their terminals are galvanically connected with power supply terminals.