BWDK-E201EF Transformer Temperature Controller-INNO

Dry-type transformers are critical assets in modern power distribution networks, commercial buildings, and industrial facilities. Maintaining safe operating temperatures is essential to prevent insulation breakdown and extend equipment lifespan.

The BWDK-E201EF INNO Dry-Type Transformer Temperature Controller (also referred to as the IB-E201EF series by Fuzhou INNO) is an embedded, industrial-grade thermal management unit. It combines three-phase temperature monitoring, intelligent cooling fan control, and remote SCADA integration into a durable iron-shell enclosure.

Decoding the BWDK-E201EF Model Name

Understanding the model nomenclature helps engineers verify that the unit matches their exact panel and SCADA requirements:

BWDK / IB-E201: Embedded metal-case dry-type transformer temperature control box.
Code “E” (Analog Output): Equipped with independent 4–20mA DC analog current outputs, enabling direct connection to PLC systems or remote analog meters.
Code “F” (Communication): Includes an RS485 serial communication interface (typically supporting the Modbus-RTU protocol) for real-time remote monitoring and smart grid integration.

Key Features of the INNO BWDK-E201EF Controller

1. Real-Time Three-Phase Monitoring

The controller uses Pt100 platinum resistance sensors embedded in the three-phase windings of the transformer. Users can switch between automatic three-phase cyclic display and maximum temperature phase display with a single button.

2. Intelligent Cooling Fan Control & Timed Excitation

When winding temperatures reach the preset threshold, the controller automatically starts the cooling fans to dissipate heat. It also supports manual fan overrides and a timed fan excitation function, which periodically runs the fans to prevent mechanical seizing during long periods of low load.

3. Comprehensive Alarm & Trip Protection

To safeguard high-value transformers, the BWDK-E201EF provides multi-stage relay outputs:

Over-Temperature Alarm: Alerts operators when winding heat exceeds safe operational limits.
Over-Temperature Trip: Sends a trip signal to disconnect the circuit breaker if temperatures reach critical levels.
Sensor Fault & Door Open Alarms: Detects Pt100 sensor short circuits or open circuits, and monitors enclosure cabinet doors for unauthorized access.

4. “Black Box” Event Recording

In the event of a power outage or thermal trip, the built-in “Black Box” memory retains the exact temperature readings of all three phases and the operational status at the moment of the fault, simplifying post-event diagnostics.

Technical Specifications (BWDK-E201EF)

Below are the standard technical parameters for the INNO BWDK-E201EF / IB-E201EF series:

Parameter	Specification
Measurement Range	-30.0°C to +240.0°C
Resolution	0.1°C
Ambient Temperature	-20°C to +55°C (Humidity < 95% at 25°C)
Working Voltage	AC 220V (+10%, -15%), 50Hz / 60Hz (±2Hz)
Fan Output Capacity	9A / 250VAC (or 5A / 250VAC depending on sub-variant)
Control / Alarm Output	5A / 250VAC; 5A / 30VDC (Resistive)
Power Consumption	≤ 8W
Analog Output (E)	3 or 4 independent channels of 4–20mA DC
Communication (F)	RS485 serial interface
Overall Dimensions	400mm × 320mm × 100mm (H × W × D)
Panel Cutout Size	371mm × 301mm (H × W)

Applications

The BWDK-E201EF INNO controller is widely deployed across demanding electrical environments:

Power Substations & Utility Grids: Reliable SCADA telemetry via 4–20mA and RS485.
Renewable Energy Plants: Wind turbines, solar inverters, and energy storage step-up transformers.
Commercial & Industrial Infrastructure: Data centers, hospitals, rail transit systems, and manufacturing plants.

Frequently Asked Questions (FAQ)

Q1: What is the difference between BWDK-E201D, BWDK-E201E, and BWDK-E201EF?

BWDK-E201D: Standard temperature monitoring, fan control, and alarm/trip relays.
BWDK-E201E: Adds 4–20mA analog current output to the standard features.
BWDK-E201EF: Combines standard functions with both 4–20mA analog output (E) and RS485 serial communication (F).

Q2: Can the BWDK-E201EF test its own relays without overheating the transformer?

Yes. The controller features a simulation test function. Technicians can simulate high-temperature conditions from the front keypad to verify that fan relays, over-temperature alarms, trip circuits, and 4–20mA outputs are functioning properly during commissioning.

Q3: Does it support custom upgrades like fiber optic temperature sensing?

Yes. For high-voltage or heavy electromagnetic interference (EMI) environments, the INNO E201 platform can be customized with Ethernet, Profibus communication, multi-channel monitoring, or fiber optic temperature sensors.