Protection and Control Devices
for Protection and Control of Voltage Transformer
RZL-05.VT

Digital oscilloscope
Event log

Integration in
SCADA-system

Environment temperature
-40°C...+55°C

User-defined logics

Application

Microprocessor devices RZL-05.VT are used for relay protection, automation, control, registration and alarm signaling of voltage transformers 110–35–10(6) kV of complete switchgears at power and industrial facilities.

Devices are designed for facilities: distribution networks, transformer substations, stations with guaranteed (AC, DC or rectified voltage) and non-guaranteed operational current.

Devices are to be mounted into relay cubicles of switchgears, relay panels.

Devices have user-defined logics inclusion.

 Download the catalog. Relay Protection and Automation Devices.

Features

• Complex substation protection by voltage (monitoring and control of voltage transformer VT1 of the first busbar section, VT2 - auxiliary transformer).
• Operating parameters settings via built-in HMI and PC software tool: functions activation/deactivation, protection stages values and time delay for each stage e t.c.
• Individual configuration of each photosensor input.
• Flexible configuration settings.
• Non-volatile storage of settings, events, fault recordings.
• Total waveform recording duration 600 s.
• A solid number of output relays, incl. one reinforced relay for switching high values instantaneous currents, switching in circuits with high inductance, and one bistable relay, eliminating the need to install additional relays.
• Remote configuration and data transfer including current parameters and function settings, apparatus state, events, measurements via RS-485 interface by MODBUS RTU protocol.
• Remote control of HV devices via MODBUS RTU protocol.
• Steel casing.
• Front side USB interface.
• Real-time self-supervision.
• Two switchable setting groups.
• Two mutually redundant power supply units.
• Universal AC/DC power supply source.
• Supply input and all signal circuits are galvanically isolated.
• Solid overvoltage withstand.
• Optocoupler-insulated binary inputs.
• Interredundant hardware and software to improve the reliability of protection, automation functions and data transfering.
• Presence of digital inputs, controlled by "dry contact", and which saves execution of their functions when switching-off operational power supply.
• Solid ambient conditions withstand (-40...+55 °C).
• Multi-lingual LCD interface: English, Ukrainian, Russian.

Functions

Protection functions	ANSI
Voltage-restrained OCP	50V/51V
Zero-sequence overvoltage protection (3 stages)	59N
Overvoltage protection (2 stages)	59
Undervoltage protection (3 stages)	27
Auxiliary channel overvoltage protection
Reverse sequence overfrequency protection
External protection by binary input
Arc fault protection by binary input
Overfrequency protection
Device overheat protection
Parameter setting groups switch by binary input    activation/deactivation
Automation functions
Automatic underfrequency load shedding	81L
Monitoring and indication functions
Combined undervoltage protection with control of operability of auxiliary channel voltage circuits
Voltage transformer secondary circuits supervision
Swithgear bay temperature supervision
Voltage circuits supervision

Technical parameters

Power supply units parameters
Operating voltage range, DC or AC	90 – 254 V
Power-on availability time	0,3 s
Operating supply interruption	0,5 s
Independent supply channels (auxiliary voltage circuits)	2
Device burden	8 Wt
Voltage input parameters
Phase voltage	100 V
Number of measurable phases voltages	3
Measured phases voltages range	0,5 – 130 V
Number of measured 3U0 voltage	1
Number of measured line voltage 100 V of VT2	1
Number of measured line voltage 380 V of auxiliary transformer	2
Measured phases voltages range:   - line voltage of VT2   - line voltage of auxiliary transformer	1 - 150 V 1 - 570 V
Voltage thermal withstand:   - continuous    / VT1, VT2   - continuous    / auxiliary transformer   - 1 s            / VT1, VT2   - 1 s            / auxiliary transformer	150 V 400 V 300 V 600 V
Thermal sensor input parameters
Number of inputs	1
Temperature range	0 - 125 °C
Communication
PC communication interface	USB - 1 pcs
Automated Control System communication interface	RS-485 - 2 pcs
Data Protocol	MODBUS RTU
Connection speed via USB, RJ-485	9600...38400 bps
Binary input parameters
Number of inputs	12
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	3
Dry contact circuits source voltage	DC 24 V
Binary output (relay) parameters
Number of binary outputs	12
AC voltage trip	400 V
Maximum AC current	8 A (16 A for K1 output)
DC voltage trip	300 V
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)	205x240x195 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	2,0 kV, 50 Hz 5,0 kV pulse
Weight, less then	6,5 kg

 Download the catalog. Relay Protection and Automation Devices.