Automatic Tap-Changing Voltage Control Device
RZL-05.AVC
Digital oscilloscope
Event log
Integration in
SCADA-system
Environment temperature
-40°C...+55°C
User-defined logics
Application
RZL-05.AVC intended for automatic and manual voltage control of a two- and three-winding three-phase power transformer with a motor driven on-load tap-changer. Devices are designed to automatically maintain the voltage at the LV-side of a power transformer within given limits around a set target voltage. RZL-05.AVC also has all necessary supervision and auto-blocking functions.
Download the catalog. Relay Protection and Automation Devices.
Operational capabilities
- Automatic, manual and remote on-load tap-changer control.
- Monitoring of boundary values of currents and voltage, regulation and alarm blocking if boundary conditions.
- Drive and voltage circuits supervision.
- Tap-changer interlocking via external contact.
- Simultaneous control of two bus systems.
- Correction of the regulated voltage level depending on the on-load current.
- Generation of pulse or continuous on-load tap-changer control commands.
- Operability monitoring of on-load tap-changer in pulsed operation mode.
- Operational switching of regulation from one bus system to another.
- Operation blocking and alarm upon detection of the on-load tap-changer failure.
- Operation blocking and alarm upon detection of the overload, 3Uо overvoltage or a low measured voltage.
- Fast changeover of two pre-selected settings groups and operating modes of voltage maintenance.
- Present tap-changer stage measurement.
- 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
- Automatic, manual and remote (via serial interface) on-load tap-changer control.
- Monitoring of boundary values of currents and voltage, regulation and alarm blocking if boundary conditions.
- Drive and voltage circuits supervision.
- Tap-changer interlocking via external contact.
Technical parameters
| Power supply units parameters | |
|---|---|
| Operating voltage range, DC or AC | 90 – 254 V |
| Power-on availability time | 0,2 s |
| Operating supply interruption | 0,5 s |
| Independent supply channels (auxiliary voltage circuits) | 2 |
| Device burden | 8 Wt |
| Current input parameters | |
| Rated input current | 5 A |
| Number of line current inputs | 4 |
| Measurable current range | 0,5 – 15,0 A |
| Current thermal withstand, continuous/1s | 10 / 100 A |
| Voltage input parameters | |
| Phase voltage | 100 V |
| Number of measurable line voltage inputs | 4 |
| Rated voltage range | 1 – 150 V |
| Maximum continuous voltage | 130 V |
| Thermal sensor input parameters | |
| Number of inputs | 1 |
| Temperature range | 0 - 125 °С |
| 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 parameters | |
| Number of binary outputs | 13 |
| 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 20 ms | 0,3 A (0,6 A for K1 output) |
| Other | |
| Mounting type | Flush |
| Device dimensions (WxHxD) | 205x240x190 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 kg |
Wiring diagram
Download the catalog. Relay Protection and Automation Devices.