GWPR200-T Transformer Protection Relay – Left-Side View

GWPR200-T Transformer Protection Relay – Right-Side View

GWPR200-T Transformer Protection Relay – Terminal Diagram

GWPR200-T Transformer Protection Relay

Functions(ANSI) 50/50N 51/51N 59/59N 27 81U 60 74 63 26 71

Product Desc

The GWPR200-T is a digital transformer protection relay designed for power systems rated up to 33 kV. It integrates protection, measurement, control, communication and fault recording functions.It can be installed in a centralized protection panel or locally in a switchgear cubicle.

The relay supports RS-485 with Modbus RTU,
optional dual Ethernet ports with IEC 60870-5-103 over Ethernet,
and time synchronization via communication messages, SNTP or 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

Product Description

The GWPR200-T provides integrated protection, measurement and control for distribution transformers, station service transformers and auxiliary transformers. It continuously monitors current, voltage, active power, reactive power, frequency, power factor and energy.
When a short circuit, overload, earth fault, abnormal voltage, abnormal frequency or transformer non-electrical fault is detected, the relay issues an alarm or trip command according to the configured pickup setting and operating delay.
The relay features a large LCD for displaying real-time measurements, protection settings, circuit-breaker status and event records. It provides 14 binary inputs and eight configurable relay outputs, supports local and remote circuit-breaker control, and incorporates event recording, disturbance recording and continuous self-supervision.

Product Functions

Protection Functions

(ANSI 50/51) Three-stage phase overcurrent protection—stages I, II and III (trip; optional undervoltage and negative-sequence voltage supervision)
(ANSI 51) Inverse-time phase overcurrent protection (trip; Standard Inverse, Very Inverse and Extremely Inverse curves; optional undervoltage and negative-sequence voltage supervision)
(ANSI 51) Definite-time overload protection (alarm or trip selectable)
(ANSI 50N/51N) Stage I earth-fault overcurrent protection (trip)
(ANSI 50N/51N) Stage II earth-fault overcurrent protection (alarm or trip selectable)
(ANSI 51N) Inverse-time earth-fault overcurrent protection (trip; Standard Inverse, Very Inverse and Extremely Inverse curves)
(ANSI 50N/51N) LV-side earth-fault overcurrent protection (alarm or trip selectable)
(ANSI 59) Overvoltage protection (trip)
(ANSI 27) Undervoltage protection (alarm or trip selectable)
(ANSI 59N) Zero-sequence overvoltage protection (alarm or trip selectable)
(ANSI 81U) Underfrequency load shedding (trip)
(ANSI 60) VT circuit supervision (alarm; blocks undervoltage protection)
(ANSI 74) Circuit-breaker control-circuit supervision (alarm)
(ANSI 27) Loss-of-supply protection (alarm or trip selectable)
(ANSI 63) Buchholz protection (trip)
(ANSI 26) High transformer temperature protection (alarm or trip selectable)
(ANSI 26) Transformer overtemperature protection (alarm or trip selectable)
(ANSI 71) Transformer oil-level supervision (alarm or trip selectable)
(ANSI 63) Pressure-relief device protection (alarm or trip selectable)
Programmable non-electrical protection inputs for transformer enclosure door status, external load-control trip and two spare non-electrical protection signals

Measurement Functions

Voltage: phase-to-neutral voltages, phase-to-phase voltages and zero-sequence voltage
Current: three-phase protection currents, three-phase metering currents, zero-sequence current and LV-side zero-sequence current
Electrical quantities: active power, reactive power, power factor and system frequency
Energy metering: forward and reverse active and reactive energy

Control and Recording Functions

Local and remote circuit-breaker open and close control
14 binary inputs and eight configurable relay outputs
Configurable trip, alarm and fault-annunciation outputs
Protection operation records, alarm records, sequence-of-events (SOE) records and operation records
Disturbance recording, continuous self-supervision and abnormal-condition alarms

Applications

The GWPR200-T is suitable for transformer protection and control in:

33 kV, 22 kV, 11 kV, 6.6 kV and 3.3 kV power distribution systems
Unearthed, resistance-earthed and solidly earthed systems
Distribution transformers
Station service transformers
Auxiliary transformers
Utility substations and power plant auxiliary power systems
Industrial, mining and petrochemical power distribution systems
Wind, solar PV and other renewable energy facilities
Centralized protection panels and switchgear-mounted applications

Frequently Asked Questions (FAQ)

Q:What is the GWPR200-T 33 kV & 11 kV Substation Transformer Protection Relay?

The GWPR200-T 33 kV & 11 kV Substation Transformer Protection Relay is a digital relay integrating transformer protection, measurement, circuit-breaker control, communication, event recording and disturbance recording. It is suitable for distribution, station service and auxiliary transformers in systems rated up to 33 kV.

Q:Which ANSI protection functions does the GWPR200-T support?

The GWPR200-T supports the following principal protection functions:
• ANSI 50/51 phase overcurrent protection
• ANSI 50N/51N earth-fault overcurrent protection
• ANSI 27 undervoltage protection
• ANSI 59 overvoltage protection
• ANSI 59N zero-sequence overvoltage protection
• ANSI 81U underfrequency load shedding
• ANSI 60 VT circuit supervision
• ANSI 63 Buchholz and pressure-relief device protection
• ANSI 26 transformer temperature protection
• ANSI 71 oil-level supervision

Q:Is the GWPR200-T suitable for both 33 kV and 11 kV transformers?

Yes. The GWPR200-T is suitable for transformer protection in 33 kV, 22 kV, 11 kV, 6.6 kV and 3.3 kV systems. CT and VT ratios, protection settings, auxiliary power supply and binary input voltage must be configured according to the project requirements.

Q:What types of transformers can the GWPR200-T protect?

The GWPR200-T Transformer Protection Relay can be applied to:
• Distribution transformers
• Substation service transformers
• Power plant auxiliary transformers
• Industrial power distribution transformers
• Transformers used in wind and solar PV facilities
The required protection configuration should be selected according to the transformer rating, connection and earthing method.

Q: Does the GWPR200-T provide voltage-supervised overcurrent protection?

Yes. Its three-stage and inverse-time phase overcurrent elements can be supervised by undervoltage and negative-sequence voltage elements. This improves fault sensitivity and helps prevent unwanted operation under normal loading or temporary overload conditions.