GWPR320-BCU Bay Control Unit

1. GWPR320-BCU Bay Control Unit -Product Introduction

• The GWPR320-BCU is a digital bay control unit supplied by GoWatron for electrical measurement acquisition from two bays, common signal monitoring and remote control of common equipment. It combines measurement, status monitoring, control, event recording and communications in a single device, providing field data and control interfaces for substation control systems.
• The unit uses a high-performance 32-bit dual-core microcontroller architecture. The main processor incorporates a digital signal processor (DSP) and a floating-point unit (FPU). An independent 16-bit analogue-to-digital converter (ADC) supports analogue signal acquisition. Analogue measurements and binary inputs are processed in real time. The modular hardware design facilitates configuration and maintenance, while an LCD and front-panel keypad allow users to view measurements, adjust settings and perform on-site commissioning.
• For configurations equipped with synchronising functions, the unit evaluates the voltages on both sides of the circuit breaker and the applicable closing conditions according to the selected mode. In synchronising mode, it uses the configured closing advance time to compensate for circuit breaker closing time and determine when to issue the close command.

2. GWPR320-BCU Bay Control Unit-Product Functions

2.1 Configuration Selection

• Optional DC analogue outputs: A three-channel 4–20 mA output option is available depending on configuration.
• DC analogue inputs and outputs are optional. Configuring three DC analogue inputs makes the Ux2 synchronising voltage input unavailable and restricts synchronising functionality. The available combination of analogue inputs and synchronising channels depends on the hardware and firmware configuration.

2.2 Electrical Measurement and Acquisition

• Acquires voltage and current signals and provides power, frequency and other electrical measurements, depending on configuration.
• Supports analogue measurement acquisition from two bays and measurement of common signals.
• Offers optional 4–20 mA DC analogue inputs for signals from external transducers.
• Offers an optional three-channel 4–20 mA output arrangement, available depending on configuration, with selectable measured quantities and configurable scaling limits.

2.3 Binary Status Monitoring

• Acquires status signals from circuit breakers, disconnectors, earthing switches and external equipment.
• Supports local display and remote viewing of binary input states.
• Records status changes to support operational monitoring and event analysis.

2.4 Remote Control

• Receives remote control commands via Ethernet or RS-485.
• Provides up to eight pairs of remote control outputs for opening and closing circuit breakers, operating disconnectors and earthing switches, issuing transformer tap-changer raise/lower commands and performing other control duties.
• Supports Remote/Local control selection.
• Provides direct remote control outputs and separate synchronism-supervised closing outputs, each operating according to its respective logic and the project-specific control circuit design.

2.5 Synchronism Supervision and Controlled Closing

Synchronising functions are available depending on configuration. The following closing modes are supported:

• Synchronism supervision can be initiated by a local manual close command or a remote close command. In the applicable checking modes, the unit blocks the close output when the required conditions are not satisfied and issues an alarm if the checking process fails or times out.
• Configuration C provides two synchronising channels. The two channels must not be enabled simultaneously.

2.6 Communications and Time Synchronisation

• Provides two Ethernet ports and two RS-485 communication ports.
• Supports IEC 60870-5-103 over Ethernet and Modbus RTU, with IEC 61850 available as an option.
• Supports time synchronisation via SNTP, communication messages and IRIG-B.
• Provides a dedicated IRIG-B time synchronisation interface.
• Supports remote viewing of operating status, equipment parameters, binary input states and self-supervision information.
• Supports remote viewing and modification of the relevant settings.

2.7 Event Recording and Maintenance

• Records function operations, operator actions and self-supervision events.
• Supports local and remote reset of unit indications.
• Provides output relay testing and event simulation for on-site commissioning.
• Supports an external serial dot-matrix printer for printing settings, event records and disturbance records.

3. GWPR320-BCU Bay Control Unit-Technical Specifications

3.1 Overall Dimensions and Panel Cut-out Dimensions

The GWPR320-BCU is designed for flush mounting in a panel. Overall dimensions and panel cut-out dimensions are shown below. All dimensions are in mm.

4.GWPR320-BCU Bay Control Unit-Applications

4.1 Substation Bay Measurement and Control

• The unit acquires electrical measurements and switching equipment status, executes remote control commands and transmits operating information to the substation control system for centralised monitoring and control.

4.2 Distribution Substations and Industrial Power Distribution Systems

• The GWPR320-BCU is suitable for measurement and control systems in factories, industrial parks and distribution substations. It supports acquisition of voltage, current and other operating data, together with remote operation of circuit breakers and associated switching equipment.

4.3 Common Signal Monitoring

• The unit collects common equipment status, external alarm signals and transducer signals, and transmits this information to the control system for centralised operational monitoring.

4.4 Circuit Breaker Closing Requiring Synchronism Supervision

• The unit is suitable for circuit breaker closing applications requiring dead-voltage checking, synchronising or closed-loop checking. It evaluates the applicable conditions according to the selected configuration and operating mode, and issues the close output when those conditions are satisfied.

4.5 Multi-channel Voltage Monitoring

• The GWPR320-BCU-B provides multiple voltage inputs for centralised acquisition of several sets of voltage signals. It is suitable for applications primarily requiring voltage monitoring and binary status acquisition.

4.6 Substation Control and SCADA Integration

• The GWPR320-BCU operates as a field measurement and control unit connected to a substation control system, communication gateway or SCADA system via Ethernet or RS-485. An optional IEC 61850 configuration is available for projects requiring this protocol.