GWPR300-T Station Transformer Protection Relay

GWPR300-T Station Transformer Protection Relay – Left View

GWPR300-T Station Transformer Protection Relay – Right View

GWPR300-T Station Transformer Protection Relay – Terminal View

GWPR300-T Station Transformer Protection Relay

Functions(ANSI) 50/50N 51/51N 51G 46 49 59/59N 27 46 63 71 26

Product Desc

The GWPR300-T Station Transformer Protection Relay is an integrated protection, measurement and control device suitable for station service transformers, earthing transformers and similar equipment in 132 kV and 66 kV substations. The device uses a high-performance 32-bit microcontroller with integrated DSP and FPU capabilities, and features comprehensive protection functions, high-precision sampling, a user-friendly human–machine interface and multiple communication interfaces. It integrates protection, measurement, control, communication, fault recording and printing functions, and is widely used in substation automation systems for station service transformers and earthing transformers.

Communication Functions

2 Ethernet ports (supporting IEC 60870-5-104)
Optional IEC 61850 support via the 2 Ethernet ports
1 RS-485 communication port (supporting Modbus RTU)
Supports time synchronisation via communication protocol messages, SNTP and IRIG-B

Request Quote

+8617621210051

+86-17621210051

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

1. Product Introduction

The GWPR300-T Station Transformer Protection Relay is a multifunctional device integrating protection, measurement and control for station service transformers, earthing transformers and similar equipment in 132 kV and 66 kV substations. The device uses a high-performance 32-bit microcontroller with integrated DSP and FPU capabilities for protection calculations, output logic processing, event recording, fault recording and communication with the supervisory system. The hardware uses independent 16-bit analogue-to-digital converters for high-precision sampling, together with an algorithm for filtering abnormal sample values to improve immunity to interference during AC signal acquisition.
The GWPR300-T Station Transformer Protection Relay provides comprehensive protection functions. Each protection element is modular, independent and flexibly configurable. The device features a user-friendly human–machine interface and convenient on-site testing functions. It is equipped with dual Ethernet ports, an RS-485 serial communication port and an IRIG-B time synchronisation port to support integration into various automation systems.

Main technical features:

High-performance 32-bit microcontroller with integrated DSP and FPU capabilities
Independent 16-bit analogue-to-digital converters for high-precision sampling and high immunity to interference
Modular protection design with independently configurable protection elements
Fully enclosed chassis with an integrated front panel and strict separation between power circuits and low-level signal circuits
Supports dot-matrix printers for printing settings, event records and fault records

2. Product Functions

Overcurrent Protection

(ANSI 50/51) Three-stage overcurrent protection (trip, with configurable definite-time delays and optional composite voltage supervision)
(ANSI 51) Inverse-time overcurrent protection (trip, with selectable standard inverse, very inverse and extremely inverse characteristics and optional composite voltage supervision)
(ANSI 49) Overload protection (alarm/trip selectable)
(ANSI 51G) Stage I zero-sequence overcurrent protection (trip, with zero-sequence voltage blocking)
(ANSI 51G) Stage II zero-sequence overcurrent protection (trip, with zero-sequence voltage blocking)
(ANSI 51G) Stage III zero-sequence overcurrent protection (alarm/trip selectable)
(ANSI 51G) Stage I low-voltage-side zero-sequence overcurrent protection (trip)
(ANSI 51G) Stage II low-voltage-side zero-sequence overcurrent protection (trip)
(ANSI 51G) Stage III low-voltage-side zero-sequence overcurrent protection (alarm/trip selectable)

Negative-Sequence Protection

(ANSI 46) Stage I negative-sequence overcurrent protection (trip, for excessive negative-sequence current caused by phase loss or other abnormal conditions)
(ANSI 46) Stage II negative-sequence overcurrent protection (alarm/trip selectable, for protection against current unbalance)

Voltage Protection

(ANSI 59) Overvoltage protection (trip)
(ANSI 27) Undervoltage protection (alarm/trip selectable)
(ANSI 59N) Residual overvoltage protection (alarm/trip selectable)

Monitoring and Alarms

VT (PT) circuit failure alarm (supervision of voltage circuit abnormalities)
Trip circuit supervision alarm

System Protection

System loss-of-supply protection (alarm/trip selectable, combining undervoltage and no-current criteria)

Non-Electrical Protection

(ANSI 63) Main transformer door-open protection (alarm/trip selectable)
(ANSI 71) Load control (alarm/trip selectable)
(ANSI 71G) Buchholz relay alarm input (gas accumulation alarm)
(ANSI 71G) Buchholz relay trip input (oil surge trip)
(ANSI 26/49) Temperature-rise protection (alarm/trip selectable)
(ANSI 26/49) Overtemperature protection (alarm/trip selectable)
Non-electrical protection 1 (alarm/trip selectable; ANSI number depends on the connected signal type)
Non-electrical protection 2 (alarm/trip selectable; ANSI number depends on the connected signal type)

Measurement and Control Functions

Voltage measurement: Ua, Ub, Uc, Uab, Ubc, Uca, 3U0, U0z
Current measurement: Ia, Ib, Ic, ia, ib, ic, 3i0, i0z, 3i0L
Power measurement: P, Q, cosφ
Energy metering: EP+, EP−, EQ+, EQ−
Supports 21 active binary inputs (AC/DC 220 V, DC 110 V or DC 48 V; to be specified when ordering)
Supports 13 independent relay outputs and 1 device loss-of-supply signalling output

Printing Function

Supports dot-matrix printers via a serial interface for printing settings, event records and fault records

Recording Functions

Protection events: records the time, operating value and protection function name for each protection operation, with a capacity of up to 128 records
Alarm events: records the time, operating value and alarm name for each alarm event, with a capacity of up to 128 records
Communication events: records changes in communication status, with a capacity of up to 128 records
Operation records: records user operations, including setting changes and the enabling or disabling of protection functions, with a capacity of up to 128 records
Self-check events: records events generated by the device self-check functions, with a capacity of up to 16 records
Fault records: records waveforms associated with protection operations, with a capacity of up to 32 records

3. Application Scenarios

Protection, measurement and control of station service transformers in 132 kV and 66 kV substations
Protection, measurement and control of earthing transformers
Integrated protection, measurement and control for station service transformers and earthing transformers
Distribution systems requiring overcurrent, overload, negative-sequence, zero-sequence, overvoltage and undervoltage protection
Applications requiring integration into substation automation systems via IEC 60870-5-104, IEC 61850 (optional) or Modbus RTU
Substation automation projects requiring fault recording, event recording and printed reports
Industrial installations requiring dual Ethernet ports, RS-485 communication and an IRIG-B time synchronisation interface

Frequently Asked Questions (FAQ)

Q:What voltage levels is the GWPR300-T Station Transformer Protection Relay suitable for?

The GWPR300-T Station Transformer Protection Relay is suitable for protection, measurement and control applications involving station service transformers, earthing transformers and similar equipment in 132 kV and 66 kV substations. These voltage levels refer to the substation system voltages. The relay receives CT and VT secondary signals for protection and measurement; it is not directly connected to the primary high-voltage circuits.

Q:What rated CT secondary currents and control circuit supply voltages does the GWPR300-T Station Transformer Protection Relay support?

The GWPR300-T Station Transformer Protection Relay supports rated AC current inputs of 1 A and 5 A. The supported control circuit supply voltages are AC/DC 220 V, DC 110 V and DC 48 V. The required configuration and any customisation requirements must be specified when ordering. The control circuit supply voltage, binary input voltage and relay auxiliary supply voltage must be confirmed separately for the ordered configuration.

Q:What communication protocols and time synchronisation methods does the GWPR300-T Station Transformer Protection Relay support?

The GWPR300-T Station Transformer Protection Relay supports IEC 60870-5-104 and Modbus RTU as standard, with IEC 61850 available as an option. It supports time synchronisation via communication protocol messages, SNTP and IRIG-B. The relay is equipped with 2 Ethernet ports and 1 RS-485 port for integration into substation automation systems.

Q:What recording functions does the GWPR300-T Station Transformer Protection Relay provide?

The GWPR300-T Station Transformer Protection Relay stores protection events (128 records), alarm events (128 records), communication events (128 records), user operation records (128 records), self-check events (16 records) and fault records (32 records). It also supports dot-matrix printers for printing settings, event records and fault records.

Q:Can the overcurrent protection of the GWPR300-T Station Transformer Protection Relay use composite voltage supervision? What does the composite voltage criterion include?

Yes. Overcurrent stages I, II and III, and inverse-time overcurrent protection, can use composite voltage supervision. The composite voltage criterion typically combines an undervoltage element and a negative-sequence voltage element. When either voltage element picks up, the voltage supervision condition is satisfied; the overcurrent element must also meet its current and timing criteria before operating. The exact logic and response to VT (PT) circuit failure must follow the relay manual and the actual configuration.

Q:How does the GWPR300-T Station Transformer Protection Relay select between calculated and directly measured zero-sequence current and voltage?

The GWPR300-T Station Transformer Protection Relay can select calculated values or values from dedicated inputs using the corresponding control word settings. For zero-sequence current, the calculated value is designated i0z, while the directly measured value is designated 3i0. For zero-sequence voltage, the calculated value is designated U0z, while the directly measured value is designated 3U0. The control word names, selection logic and scaling relationships must follow the relay manual.

Q:Does the GWPR300-T Station Transformer Protection Relay support non-electrical protection? What does it include?

The GWPR300-T Station Transformer Protection Relay supports non-electrical protection inputs for main transformer door-open protection, load control, Buchholz relay alarm and trip signals, temperature-rise protection, overtemperature protection, non-electrical protection 1 and non-electrical protection 2. The Buchholz gas accumulation signal initiates an alarm, while the Buchholz oil surge signal initiates a trip. The other listed functions can be configured for alarm or trip. The input names and operating modes must match the actual relay configuration.

Q:Does the GWPR300-T Station Transformer Protection Relay support remote modification of settings and control words?

The GWPR300-T Station Transformer Protection Relay supports remote modification of settings and control words. The corresponding “Remote Setting Modification” or “Remote Control Word Modification” software enable setting must be set to “1”. These enable settings can only be changed locally.

Q:How are settings saved after modification on the GWPR300-T Station Transformer Protection Relay? What is the password?

After modifying parameters on the GWPR300-T Station Transformer Protection Relay, enter the save password when prompted upon exiting the parameter settings screen. The password stated in the supplied documentation is 1000. Operation must follow the applicable version of the relay manual and the access permissions configured on site.

Q:What are the operating temperature range and electromagnetic immunity specifications of the GWPR300-T Station Transformer Protection Relay?

The GWPR300-T Station Transformer Protection Relay has an operating temperature range of −40 to +70 °C and a storage and transport temperature range of −40 to +80 °C. The specified relative humidity range is 5% to 90%, with no condensation inside the device. The specified electrostatic discharge immunity test levels are ±8 kV for contact discharge and ±15 kV for air discharge. The applicable test conditions and standards must be confirmed against the product technical documentation and test reports.