CN206152472U - Transformer oil electromagnetic induction auxiliary heating device - Google Patents

Abstract

The utility model relates to an electromagnetic induction auxiliary heating device for transformer oil. It is characterized in that it includes steel oil pipes (2) respectively connected to the oil inlet of the transformer and the oil outlet of the oil filter unit, and at least three sets of heating coils (1) are sequentially installed on the steel oil pipes (2) along the length direction. , temperature sensors are respectively installed at both ends and in the middle of the steel oil pipe (2), all the control circuits of the heating coil (1) and all temperature sensors are connected to the temperature controller (3) respectively, and are connected to the oil outlet of the transformer respectively. The oil return pipe (5) connected with the oil inlet port of the oil filter unit. The trial proves that after adopting the heating device of the utility model, the transformer oil can be effectively heated, the oil filtering time can be significantly reduced, and the working efficiency can be improved.

Description

Transformer oil electromagnetic induction auxiliary heating device

technical field

The utility model relates to an electromagnetic induction auxiliary heating device for transformer oil.

Background technique

During the long-term operation of AC or converter transformers, the insulating oil is affected by external impurities, contact with air, and high temperature of the equipment itself, so that the quality of the oil gradually deteriorates, and the deteriorated insulating oil will not play its due role. insulation and cooling effect. Therefore, when the transformer is newly installed or overhauled, it is necessary to filter the insulating oil to remove water and impurities in the oil, improve the electric strength of the oil, protect the paper insulation in the oil, and improve the physical and chemical properties of the oil to a certain extent. .

During the oil treatment of the transformer, it is necessary to heat the oil to promote the evaporation of water in the oil and the precipitation of gas. In order to avoid the aging of the insulating oil caused by excessive temperature, the construction process requires that the heating temperature of the oil is generally 55-60 ℃, and it is further stipulated that when the oil temperature reaches 55-60 ℃, the hot oil circulation timing starts. In actual work, the heating of transformer oil is mainly realized by the heating function of the oil filter unit. Because the oil filter is limited by its own power and volume, its heating power is not high, and it takes a long time to reach the temperature required by the construction process. The specified temperature cannot be reached at all, especially in winter construction, which greatly prolongs the oil filtering time, and the oil filtering efficiency is low, which affects the safe and stable operation of the transformer equipment. Thereby urgently need a kind of transformer oil auxiliary heating device, to improve oil filtering work efficiency, guarantee oil product quality.

Utility model content

The purpose of the utility model is to provide a transformer oil electromagnetic induction auxiliary heating device, which can significantly shorten the treatment time of the transformer oil, and improve the oil filtering quality and work efficiency.

An electromagnetic induction auxiliary heating device for transformer oil, which is special in that it includes steel oil pipes respectively connected to the oil inlet of the transformer and the oil outlet of the oil filter, and at least three oil pipes are sequentially set on the steel oil pipe along the length direction. A group of heating coils, temperature sensors are respectively installed at both ends and in the middle of the steel oil pipe, all the heating coil control circuits and all temperature sensors are respectively connected to the temperature controller, and are respectively connected to the transformer oil outlet and the oil filter unit. The oil return pipe connected to the oil port.

Wherein the steel oil pipe is covered with a thermal insulation layer.

Among them, manual butterfly valves are installed at both ends of the steel oil pipe.

Wherein the heating coil is connected with the thyristor variable frequency power supply through the control circuit so as to supply power.

The trial proves that after adopting the heating device of the utility model, the transformer oil can be effectively heated, the oil filtering time can be significantly reduced, and the working efficiency can be improved.

Description of drawings

Accompanying drawing 1 is the structural representation of the utility model.

detailed description

As shown in Figure 1, the utility model provides a transformer oil electromagnetic induction auxiliary heating device, which includes steel oil pipes 2 connected with the oil inlet of the transformer and the oil outlet of the oil filter respectively, and the steel oil pipe 2 along the Six sets of heating coils 1 are set sequentially in the length direction, (intelligent) temperature sensors are respectively installed at both ends and in the middle of the steel oil pipe 2, and all the heating coil 1 control circuits and temperature sensors are respectively connected with the temperature controller 3, and It includes an oil return pipe 5 communicating with the oil outlet of the transformer and the oil inlet of the oil filter respectively. Wherein the steel oil pipe 2 is covered with a heat insulation layer, and manual butterfly valves 4 are respectively installed at both ends of the steel oil pipe 2 . In addition, the heating coil 1 is connected to a thyristor variable frequency power supply through a control circuit to provide power.

Example 1:

When the utility model is in use, it is connected in series between the transformer equipment and the oil filter equipment, and uses the principle of electromagnetic induction heating to auxiliary heat the transformer oil to ensure the oil quality and work efficiency, and ensure the safe and stable operation of the transformer equipment. The transformer oil electromagnetic induction auxiliary heating device is mainly composed of steel oil pipe 2, heating coil 1, temperature sensor, thyristor frequency conversion power supply system, temperature controller 3, alarm, indicator light, etc.

The utility model adopts a frequency conversion power supply system, and by adjusting the current to change the alternating magnetic flux, the electric energy is converted into magnetic energy, so that the heated steel body senses the magnetic energy and self-heats to achieve the purpose of heating the transformer oil in the steel oil pipe 2. Divide the heating coil 1 into six sections (groups), put them in step by step according to the needs, and adjust them within the range of 0-100°C, so that the surface heat load is less than 1.0w/square centimeter. The steel cylinder is wrapped with thermal insulation material to reduce heat loss and improve thermal efficiency.

Arrange temperature probes at multiple points in the oil inlet and outlet and in the middle of the pipeline, output the collected temperature to the display screen of the temperature controller 3 through 4-20mA, and automatically set the oil temperature value through the temperature controller 3 to automatically control the heating coil 1. Carry out start-stop control so that the oil temperature of the transformer does not meet the specified requirements, start one or more sets of heating coils 1, and stop heating step by step after the oil temperature reaches the specified value.

When the temperature of the heating coil 1 is higher than the maximum temperature setting value (such as 85°C), it will give an alarm in two ways of buzzing and flashing of the alarm light and automatically stop. When the amount of oil is too low, it will give an alarm in two ways, buzzing and flashing of the alarm light, and automatically shut down to avoid damage to the heater caused by dry burning. When one group of heating coils 1 fails, another group is automatically put into heating. In the event of short circuit, overcurrent, overload and overvoltage, an alarm signal will be sent through the corresponding intermediate relay and thermal relay. The buzzing alarm is set on the panel and the local button is reset.

When the utility model is in use, it is connected in series in the oil filter circuit. A flange is set in the circuit to realize the connection of the pipeline, and a manual butterfly valve 4 is set to realize the opening and closing of the heating circuit. The butt joint surface is provided with grooves and rubber pads to ensure sealing . On the control panel of temperature controller 3, set work, stop, and fault alarm indicator lights to monitor the working status of the device.

Using method and working principle of the present utility model are:

First of all, the utility model is connected with the transformer and the oil filter equipment respectively. During normal operation, the eddy current generated by electromagnetic induction can be used for auxiliary heating of the transformer oil as required. When the temperature does not meet the requirements, multiple sets of heating coils 1 are automatically put in to meet the requirements. Afterwards, it will automatically stop step by step, and when there is an abnormal operation, it will automatically alarm and stop. The above functions are all conventional functions of the existing temperature controller. The application of the device greatly improves the processing speed and efficiency of the transformer oil, thereby ensuring the stable and reliable operation of the transformer.

Claims (4)

1. A transformer oil electromagnetic induction auxiliary heating device is characterized in that: it comprises a steel oil pipe (2) communicated with the oil inlet of the transformer and the oil outlet of the oil filter machine respectively, and the steel oil pipe (2) along the length There are at least three sets of heating coils (1) installed in sequence, and temperature sensors are respectively installed at both ends and in the middle of the steel oil pipe (2). The control circuits of all heating coils (1) and all temperature sensors are respectively connected with the temperature controller (3) connection, also includes the oil return pipe (5) that is respectively communicated with the oil outlet of the transformer and the oil inlet of the oil filter unit. 2. The transformer oil electromagnetic induction auxiliary heating device according to claim 1, wherein the steel oil pipe (2) is covered with a heat insulation layer. 3. The electromagnetic induction auxiliary heating device for transformer oil according to claim 1, wherein manual butterfly valves (4) are respectively installed at both ends of the steel oil pipe (2). 4. The transformer oil electromagnetic induction auxiliary heating device according to claim 1, wherein the heating coil (1) is connected to a thyristor variable frequency power supply through a control circuit to supply power.