1、 Background

In the power system, the operating environment of key equipment such as medium and high voltage switchgear, terminal boxes, ring main units, and box transformers directly determines their working stability and service life. Low temperature can easily cause mechanical components of equipment to jam, high temperature can accelerate insulation aging, and moisture and condensation are more likely to cause serious accidents such as creepage and flashover, resulting in widespread power outages or equipment damage. The traditional manual monitoring and adjustment method has low efficiency, slow response, and cannot adapt to environmental changes in real time, making it difficult to meet the precise control requirements of temperature and humidity for power equipment. To address this pain point, Ankerui Electric Co., Ltd. has developed the WHD series intelligent temperature and humidity controller, which builds a strong operational safety barrier for power equipment through automated and precise environmental control.

2、 Product Overview

The WHD series temperature and humidity controller is an intelligent control device designed specifically for optimizing the internal environment of power equipment. The core consists of three parts: sensors, controllers, and heaters (or fans), which can achieve real-time monitoring and automatic adjustment of temperature and humidity. This series of products covers four major models: WHD48, WHD72, WHD46, and WHD20R. It supports 1-3 temperature and humidity control channels and is compatible with various installation methods such as embedded and rail mounted. It can also expand auxiliary functions such as RS485 communication, alarm output, and transmission output. Its working principle is: the sensor collects real-time environmental temperature and humidity data, and the controller analyzes and processes it. When the value reaches the preset threshold, the heater or fan automatically starts to perform heating, cooling, and dehumidification operations. After the value returns to the normal range, it automatically stops without manual intervention throughout the process. At the same time, it has functions such as fault alarm and forced regulation, fully ensuring the stability of the equipment environment.

3、 Product features and parameters

（1） Core Features

1. Accurate monitoring and efficient regulationThe temperature measurement accuracy reaches ± 1 ℃, the humidity accuracy is ± 5% RH, and it can accurately capture environmental changes; Preset default control logic (such as ≤ 5 ℃ heating, ≥ 85% RH dehumidification,>40 ℃ air blowing), with flexible adjustment of hysteresis to avoid frequent start stop of equipment and achieve higher regulation efficiency.

2. Rich models and strong adaptabilityCovering four shapes: 48 square, 72 square, 46 slot, and 20R guide rail, it supports 1-3 temperature and humidity control channels, and auxiliary functions can be selected as needed (communication, alarm, and transmission can be selected or combined), adapting to the installation space and functional requirements of different power equipment.

3. Fully functional, safe and reliableIn addition to basic temperature and humidity control, it also has extended functions such as sensor disconnection alarm, forced heating/blowing, and transmission output; The average trouble free working time is ≥ 50000 hours, the insulation resistance is ≥ 100M Ω, the power frequency withstand voltage reaches 2kV/1min, the anti-interference ability is strong, and the operation is stable.

4. Easy to operate, efficient operation and maintenanceEquipped with clear panel display and buttons, supporting on-site parameter programming settings, automatically returning to measurement status after 1 minute of no operation; Supporting MODBUS (RTU) communication protocol, data can be remotely read and parameters can be modified through the upper computer to achieve centralized operation and maintenance management.

5. Flexible installation and standardized wiringSupports embedded hole installation and DIN35mm rail installation. The sensor and controller are connected using four core shielded wires, with a maximum distance of 20 meters. The communication cable shielding layer is grounded to effectively reduce interference.

（2） Key parameters

4、 Application scenarios

The WHD series temperature and humidity controller focuses on regulating the internal environment of power equipment, with core application scenarios including:

1. Medium and high voltage switchgear: prevent insulation failure caused by moisture and condensation inside the cabinet, avoid aging of switch components due to high temperature, and ensure the reliability of switch operation;

2. Terminal box: solves the problems of large temperature difference and easy condensation in outdoor terminal boxes, protects the wiring terminals from oxidation and short circuit;

3. Ring network cabinet: Maintain stable temperature and humidity inside the cabinet, prevent insulation performance degradation caused by SF6 gas leakage, and ensure the continuity of ring network power supply;

4. Box type transformer: adapted to the narrow and enclosed environment characteristics of box type transformers, avoiding low-temperature freezing and cracking of components, and high-temperature damage to transformer insulation layers;

5. Other electrical equipment, such as distribution panels, relay protection cabinets, etc., require precise control of environmental temperature and humidity in electrical equipment scenarios.

5、 Summary

The WHD series temperature and humidity controller has the core advantages of "precise monitoring, intelligent regulation, and safety and reliability". Through rich model selection, comprehensive functional configuration, and stable operating performance, it is suitable for the environmental control needs of 110kV and below voltage level power equipment. It can not only automatically avoid equipment failures caused by abnormal temperature and humidity, reduce operation and maintenance costs and power outage losses, but also support remote operation and data tracing, which is in line with the trend of intelligent development of power systems. Whether it is an outdoor terminal box or an indoor switchgear, the WHD series can provide customized environmental control solutions, becoming an "intelligent environment manager" to safeguard the safe operation of power equipment and provide solid guarantees for the stable and efficient operation of the power system.