GWPR300‑TB Transformer Backup Protection Relay
Product Desc
GoWatron GWPR300‑TB transformer backup protection relay is designed for transformers with 33kV‑132kV voltage classes. Select GWPR300‑THB for high‑voltage side and GWPR300‑TLB for low‑voltage side. It enables flexible backup protection configuration for high‑, medium‑ and low‑voltage sides of transformers, integrating protection, measurement & control, communication and fault recording functions. Equipped with a 32‑bit high‑performance MCU and DSP floating‑point arithmetic unit, it adopts 16‑bit high‑precision AD sampling. Featuring modular hardware design and galvanic isolation between strong and weak circuits, it delivers excellent EMC performance, adapting to harsh substation environments with high temperature and severe electromagnetic interference. It provides comprehensive fault protection and real‑time data acquisition & monitoring for power transformers.
- Communication: Dual Ethernet ports and RS‑485 interface; supports IEC‑104, Modbus‑RTU protocols, with optional IEC61850 (MMS).
- Time Synchronization: IRIG‑B code time synchronization, SNTP network time synchronization.
- Supports external printer for outputting protection settings, event reports and fault recording files.
Accuracy
≤ 0.2%
Quick Response
≤ 100ms
Reliable Protection
Comprehensive Protection
Quality Assurance
ISO 9001 Certified
Technical Support
24/7 Expert Support
Fast Delivery
Global Shipping
Warranty
2-Year Warranty
Product Introduction
- GoWatron GWPR300‑TB transformer backup protection relay adopts a panel‑mounted fully‑enclosed chassis. Its hardware consists of AC sampling module, power supply module, relay output module, digital input (DI) module, CPU module and HMI module. The modular architecture facilitates on‑site maintenance. Operating temperature ranges from ‑40℃ to 70℃ with wide‑range AC/DC power supply support. Passive relay outputs feature high contact capacity. Its insulation and EMC performance comply with international standards, providing immunity against electrostatic discharge, surge, electrical fast transient and other field interferences. Equipped with LCD display and physical operation keys, it supports local setting configuration, status viewing, event access and device commissioning. Built‑in large‑capacity memory stores abundant event logs and fault recording data for post‑fault analysis. It is the preferred device for transformer backup protection in power transmission & distribution projects.
Product Functions
Protection Functions
- (ANSI 50N/51N) Zero‑sequence Overcurrent I & II Protection (Trip, configurable with zero‑sequence directional element and zero‑sequence voltage blocking)
- (ANSI 51N) Zero‑sequence Overcurrent III Protection (Alarm / Trip selectable)
- (ANSI 51N) Zero‑sequence Inverse‑time Overcurrent Protection (Trip; Normal / Very / Extremely inverse characteristics selectable)
- (ANSI 51G) Gap Zero‑sequence Overcurrent Protection (Alarm / Trip selectable)
- (ANSI 51/67) Phase Overcurrent I, II & III Protection (Trip, configurable with directional element and composite voltage blocking)
- (ANSI 51) Phase Inverse‑time Overcurrent Protection (Trip; Normal / Very / Extremely inverse characteristics selectable, configurable with directional element and composite voltage blocking)
- (ANSI 49) Overload Protection (Alarm / Trip selectable)
- Cooling Fan Start‑up Protection (Triggered by overcurrent, operates to start cooling equipment)
- On‑load Tap‑changer Blocking Protection (Triggered by overcurrent, operates to block on‑load tap‑changing)
- (ANSI 59) Overvoltage Protection (Trip)
- (ANSI 27) Undervoltage Protection (Alarm / Trip selectable)
- (ANSI 59N) Zero‑sequence Overvoltage Protection (Alarm / Trip selectable)
Alarm & Supervision Functions
- PT Circuit Break Supervision Alarm
- PT Loss‑of‑voltage Alarm
- Control Circuit Break Alarm
- System Power Failure (Alarm / Trip mode configurable)
- SF6 Gas Pressure Fault (Alarm / Trip mode configurable)
- Non‑electrical Quantity 1~4 Protection (Alarm / Trip selectable; accepts transformer body signals such as Buchholz (gas accumulation), winding temperature and pressure relief device)
Measurement & Control Functions
- Full‑scale acquisition of three‑phase voltages, zero‑sequence voltage, protective & measuring three‑phase currents and zero‑sequence current; measures active power, reactive power, power factor and frequency; performs four‑quadrant energy metering.
- Supports multi‑channel active digital input acquisition and multiple independent relay remote‑control outputs, realizing complete binary‑status acquisition and remote‑control output capability.
Event & Fault Recording
- Stores multi‑type event logs including protection operations, alarms, binary‑status changes and device self‑tests.
- Fault recording outputs files in standard COMTRADE format, fully capturing pre‑fault and post‑fault waveforms.
- Supports switching and copying of multiple setting groups; provides local output contact commissioning test function.
Application Scenarios
- Backup protection for high‑, medium‑ and low‑voltage sides of main transformers in 33kV‑132kV substations
- Suitable for transformer protection & control cubicles in industrial, mining and industrial‑park self‑owned power stations
- Transformer protection projects for photovoltaic and wind‑power step‑up stations
- Transformer protection for power distribution systems in mining, metallurgical and chemical industries
- New construction and retrofit projects for water conservancy and rail‑transit power transmission & distribution systems
