GoWatron -One-Stop Power & Energy Solutions

The GoWatron GWPR300-VTP Busbar VT Paralleling Relay integrates voltage monitoring, abnormal voltage alarms and VT secondary voltage circuit paralleling and de-paralleling. It continuously monitors the voltages of two busbar sections and automatically establishes the secondary paralleling connections when the primary busbar paralleling status, paralleling permissive signal and relevant voltage criteria are satisfied. It also provides overvoltage, undervoltage and residual overvoltage alarms.

Communication:
• Two Ethernet ports supporting IEC 60870-5-104;
• Two optional Ethernet ports supporting IEC 61850;
• One RS-485 communication port supporting Modbus RTU.

The GoWatron GWPR320-BCU Bay Control Unit is a digital measurement and control device integrating electrical measurement, binary status acquisition, remote control, synchronism supervision, controlled closing and communications. It is designed for bay measurement and control and common signal monitoring in substations, distribution substations and industrial power distribution systems. Available in A, B and C configurations, the unit offers different combinations of voltage inputs, current inputs and synchronising channels. Two Ethernet ports and two RS-485 ports support integration with substation control or SCADA systems via IEC 60870-5-103 over Ethernet and Modbus RTU, with IEC 61850 available as an option.

The GWPR300-MBD Motor Magnetic Balance Differential Protection Relay is a numerical protection and control relay designed by GoWatron specifically for high- and low-voltage induction motors. It integrates protection, measurement, control, communications, and disturbance recording functions. The relay can be installed in a centralised protection panel or locally in a switchgear cubicle.

• The relay provides two RS-485 interfaces supporting Modbus RTU communication, one of which shares its connection with the time synchronisation interface. This shared interface can be configured for either serial communication or time synchronisation, while other communication and time synchronisation functions remain available as supported by the device configuration.
• It is equipped with dual Ethernet ports (supporting the IEC 60870-5-103 over Ethernet protocol, with optional IEC 60870-5-104 or IEC 61850 protocols).
• It supports time synchronisation via communication messages, SNTP, or IRIG-B.

• The GWPR400-FV Underfrequency and Undervoltage Protection and Load Shedding Relay is a numerical protection and control relay designed to support power system frequency and voltage stability. It integrates underfrequency protection (ANSI 81U), undervoltage protection (ANSI 27), automatic load shedding, accelerated load shedding based on the rate of change of frequency (df/dt) and the rate of change of voltage (dU/dt), voltage transformer (VT) circuit failure supervision and protection blocking functions.
• The GWPR400-FV relay monitors the voltage of two busbar sections and provides eight underfrequency load-shedding stages and eight undervoltage load-shedding stages, each comprising five basic stages and three special stages. Its programmable trip output matrix supports up to 60 load feeder circuits in total, enabling selective load disconnection to reduce the risk of frequency and voltage instability.
• The relay provides two Ethernet ports and one RS-485 interface, supporting IEC 60870-5-103, IEC 60870-5-104 and Modbus communication protocols, with optional IEC 61850. NTP and IRIG-B time synchronisation are also supported. The GWPR400-FV relay can be integrated into substation automation systems (SAS) and SCADA platforms for remote monitoring, event recording, disturbance recording and operational data transmission.

• The GoWatron GWPD-S-HFCT High-Frequency Current Transformer Partial Discharge Sensor is designed for insulation condition monitoring of power cables and cable accessories. It uses a high-frequency current transformer (HFCT) to detect partial discharge pulses propagating through cable screen earthing circuits and convert them into voltage signals. An associated acquisition unit processes and transmits these signals, providing data to help identify potential insulation defects.
• The split-core design allows installation without disconnecting the monitored earthing conductor, facilitating monitoring upgrades to existing installations. Wired and wireless configurations are available. Combined with power-frequency synchronisation and a compatible monitoring system, the sensor supports analysis of pulse amplitude, repetition rate, phase distribution and trends to assist insulation condition assessment and maintenance planning. Applications include substations, power plants, renewable energy installations and industrial power distribution facilities.

• The GWPD-S-AE from GoWatron is an acoustic emission (AE) partial discharge sensor designed for insulation condition monitoring of electrical equipment. It captures ultrasonic acoustic emissions generated by partial discharge to support equipment condition assessment and condition-based maintenance.
• The sensor has an ultrasonic detection frequency range of 40 ± 1 kHz and a detection dynamic range of −10 to 60 dBμV. Wireless and RS-485 wired versions are available, with internal or wireless power-frequency synchronisation. The sensor features magnetic mounting, an IP66 protection rating and an operating temperature range of −40 to +85 °C. Monitoring arrangements should suit the equipment structure and acoustic propagation conditions.

The GWPD-S-TEV TEV partial discharge sensor from GoWatron is designed for metal-enclosed electrical equipment, including high-voltage switchgear and ring main units (RMUs). It is available in a LoRaWAN wireless version and an RS-485 wired version. The sensor has a TEV detection bandwidth of 3–100 MHz and a TEV detection dynamic range of 0–60 dBmV. It supports internal or wireless power-frequency synchronisation. The wireless version incorporates a lithium thionyl chloride battery with a nominal battery life of more than six years, while the wired version uses an external power supply. With an IP66 protection rating, the GWPD-S-TEV provides measurement data for online partial discharge monitoring, insulation condition assessment and condition-based maintenance.

• The GWPS-110V/220V-400AH AC/DC Integrated Power Supply System from GoWatron is designed for substations, power plants, industrial facilities and renewable energy step-up substations. Available in 110 V DC or 220 V DC configurations, it incorporates a battery bank rated at 400 Ah, together with AC distribution, high-frequency switching rectifiers, DC distribution, battery charging control, insulation monitoring, and central monitoring and control. Rectifier capacity is selected to meet load and charging requirements, while backup supply duration is calculated from the load profile and battery discharge characteristics.
• The system supplies DC power to protection relays, circuit-breaker tripping and closing circuits, substation automation equipment and DC emergency lighting. Following loss of the AC input, the battery bank continues to supply the DC loads. An optional inverter or uninterruptible power supply (UPS) can supply designated AC loads, and a DC/DC power supply can be provided for communication equipment.
• The system can be configured as a five- or six-cabinet arrangement, with individual cabinet dimensions of 2,260 × 800 × 600 mm (H × W × D). The arrangement includes battery charger, DC distribution and battery cabinets, with separate AC distribution or inverter cabinets where required. The final cabinet schedule depends on the system voltage, battery dimensions, number of outgoing feeders and selected equipment. A separate UPS cabinet is optional.