GWPC300-TP transformer protection panel
Product Desc
The GWPC300-TP transformer protection panel is primarily used for the protection and control of step-up and step-down transformers in 132 kV, 66 kV and 33 kV substations and power plants. It is a complete secondary cabinet integrating a full suite of main transformer relay protection, measurement and control, signal processing, and control circuits, serving as the core secondary apparatus of substations and power plants.
Measurement Accuracy
≤ 0.2%
Quick Response
≤ 20 ms
Reliable Protection
Comprehensive Protection
Quality Assurance
ISO 9001 Certified
Technical Support
24/7 Expert Support
Fast Delivery
Global Shipping
Warranty
2-Year Warranty
Product Overview
- The GWPC300-TP Main Transformer Protection Panel is an integrated secondary complete set of equipment specially designed for main transformers in 33kV, 66kV and 132kV substations, as well as step-up and step-down main transformers in power plants. It integrates core functions including transformer protection, data measurement and control, on-load tap-changer regulation, signal monitoring and communication transmission. The panel enables real-time monitoring of main transformer operating conditions and rapid fault isolation, providing essential protection for the safe and stable operation of main transformers.
- The equipment adopts an IEC standard secondary cabinet with dimensions (H×W×D): 2260mm × 800mm × 600mm, integrally welded from cold-rolled steel plates to ensure a robust structure and high mechanical strength, suitable for long-term indoor operation in substations. The cabinet is equipped with a tempered glass viewing window, anti-theft lock, top heat dissipation structure, bottom cable entry holes and copper earthing busbars, offering excellent dustproof, moisture-proof, anti-condensation and EMI-resistant performance. Fully fitted with standard auxiliary accessories such as mounting rails, wiring ducts, insulating partitions, terminal blocks and wire markers inside the cabinet, it adopts physically segregated routing of power and control circuits to effectively mitigate electromagnetic interference. Neatly arranged wiring simplifies commissioning and maintenance, and the whole panel fully complies with power engineering acceptance criteria.
Product Functions
- (ANSI 87TU) Transformer Differential Instantaneous Protection (Trip)
- (ANSI 87T) Percentage Restrained Differential Protection (Trip, restrained by 2nd Harmonic Component and CT Secondary Circuit Broken Condition)
- CT Secondary Circuit Broken Alarm (Alarm)
- Differential Current Exceed Limit Alarm (Alarm)
- (ANSI 50) Stage I Phase Instantaneous Overcurrent Protection (Trip)
- (ANSI 51) Stage II Phase Definite Time Overcurrent Protection (Trip)
- (ANSI 51) Stage III Phase Definite Time Overcurrent Protection (Trip, restrained by Direction and Compound Voltage)
- (ANSI 51) Inverse Time Phase Overcurrent Protection (Trip, Normal / Very Inverse / Extremely Inverse Curves Optional, restrained by Direction and Compound Voltage)
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(ANSI 67) Directional Overcurrent Protection (Trip, restrained by Direction and Compound Voltage)
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(ANSI 46) Negative Sequence Overcurrent Protection (Alarm / Trip Optional)
- (ANSI 49) Thermal Overload Protection (Alarm / Trip Selectable)
- Cooling Fan Start-up Control (Fan Activation)
- On-Load Tap Changer Voltage Regulation Block Control (Voltage Regulation Blocking)
- (ANSI 51N) Stage II Zero Sequence Definite Time Overcurrent Protection (Trip, No Restraint)
- (ANSI 51N) Stage II Zero Sequence Definite Time Overcurrent Protection (Trip, restrained by Zero Sequence Direction and Zero Sequence Undervoltage)
- (ANSI 51N) Stage III Zero Sequence Definite Time Overcurrent Protection (Alarm / Trip Selectable)
- (ANSI 51N) Inverse Time Zero Sequence Overcurrent Protection (Trip, Normal / Very Inverse / Extremely Inverse Curves Optional)
- (ANSI 51G) Neutral Gap Zero Sequence Overcurrent Protection (Alarm / Trip Selectable)
- (ANSI 59) Phase Overvoltage Protection (Trip)
- (ANSI 27) Phase Undervoltage Protection (Alarm / Trip Selectable)
- (ANSI 59N) Zero Sequence Overvoltage Protection (Alarm / Trip Selectable)
- (ANSI 60) PT Broken Circuit Protection (Alarm)
- (ANSI 60) PT Loss of Voltage Protection (Alarm)
- Control Circuit Broken Alarm (Alarm)
- Station Auxiliary Power Loss Protection (Alarm / Trip Selectable)
- (ANSI 63) SF6 Gas Pressure Abnormal Protection (Alarm / Trip Selectable)
- (ANSI 63) Main Tank Light Gas Relay Protection (Trip / Alarm Selectable)
- (ANSI 63) Main Tank Heavy Gas Relay Protection (Trip / Alarm Selectable)
- (ANSI 63) OLTC Light Gas Relay Protection (Trip / Alarm Selectable)
- (ANSI 63) OLTC Heavy Gas Relay Protection (Trip / Alarm Selectable)
- (ANSI 49) Temperature Rise Protection (Alarm / Trip Selectable)
- (ANSI 49) High Temperature Protection (Trip / Alarm Selectable)
- (ANSI 49) Cooling System Fault Protection (Trip / Alarm Selectable)
- (ANSI 63) Pressure Relief Device Protection (Trip / Alarm Selectable)
- (ANSI 49) Oil Temperature Abnormal Protection (Trip / Alarm Selectable)
- (ANSI 63) Oil Level Abnormal Protection (Trip / Alarm Selectable)
Core Hardware Configuration Inside Panel
The complete set of dedicated secondary core equipment for the main transformer is fully integrated into the panel, with complete configuration and full functionality:
- GWPR300-TD Transformer Differential Protection Relay – 1 unit
- GWPR300-THB Transformer HV Backup Protection Relay – 1 unit
- GWPR300-TLB Transformer LV Backup Protection Relay – 1 unit
- GWPR300-TNE Transformer Non-Electrical Quantity Protection Relay – 1 unit
- GWPR300-TMC Transformer Body Measurement & Control Unit – 1 unit
- GWPR300-OLTC Transformer On-Load Tap Changer Controller – 1 unit
- Transformer Temperature Monitor – 1 unit
Functions & Applications
- Differential Main Protection – Provides instantaneous tripping for severe faults such as internal winding short circuits, inter-turn short circuits, and lead wire short circuits, thereby preventing catastrophic equipment damage.
- HV & LV Backup Protection – Integrates multiple protection functions, including composite voltage-blocking overcurrent, zero-sequence overcurrent, neutral gap zero-sequence overvoltage, overload, zero-sequence voltage protection, and cooling system fault protection. It fully covers fault scenarios such as external short circuits, neutral grounding faults, overloads, and cooling system abnormalities, ensuring all-round backup protection.
- Non-Electrical Quantity Protection – Provides real-time acquisition of transformer body signals, including Buchholz relay, oil temperature, pressure relief, and abnormal oil level. It supports heavy gas tripping, light gas alarming, high-temperature alarm/tripping, and pressure relief protection to monitor latent internal faults.
Measurement, Control & Communication System
- The measurement and control unit collects real-time analog data from each side of the transformer, including three-phase voltages, three-phase currents, active/reactive power, power factor, oil temperature, and winding temperature. It also acquires binary signals such as circuit breaker status, disconnector status, tap changer position, and mechanism energy storage status.
- The equipment supports mainstream communication protocols including IEC 61850, Modbus, IEC 60870-103 and IEC 60870-104. It uploads full-station operating data, fault records, and alarm information to the substation background monitoring system in real time, enabling remote monitoring, data retrieval, and intelligent operation and maintenance (O&M).
