High-frequency non-contact rapid heating device and method for distribution transformer terminal

A technology for distribution transformers and rapid heating, which is applied in the direction of induction heating devices, induction heating, induction heating control, etc., which can solve the problems of finding material differences and achieve non-destructive, non-contact, and rapid heating effects

Inactive Publication Date: 2018-08-21

GUANGZHOU POWER SUPPLY CO LTD

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AI-Extracted Technical Summary

Problems solved by technology

It is difficult to find material differences from conventional items such as short cir...

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Method used

[0026] Moreover, the induction heating coil in the high-frequency heating device can heat the terminals of the distribution transformer, which has the characteristics of size adaptation, simple and fast, uniform and non-destructive, safe and efficient. The insulating hot shoe can overcome the shortcoming of the heating terminal dissipating heat too quickly in the air, and has the characteristics of insulation and heat insulation.

[0034] The main components of the high-frequency heating circuit are a host, an induction heating coil and an insulating hot shoe. The host is connected to a 380V power frequency three-phase AC power supply. The front panel of the host has function keys for setting heating current, heating time, heat preservation time, cooling time and "automatic/manual". The back of the host is equipped with a three-phase air switch to control the opening of the external circuit. broken. The high-frequency and large current output by the host flows to the induction heating coil wound into a spiral shape, and a stron...

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Abstract

The invention relates to the nondestructive detection technology for distribution transformer equipment, and particularly relates to a high-frequency non-contact rapid heating device and a method fora distribution transformer terminal. The device comprises a temperature control device, a high-frequency heating device and a water circulation device, wherein the temperature control device comprisesa temperature collector, a temperature control alarm and a thermal relay; the high-frequency heating device comprises a main engine, an induction heating coil and an insulating hot boot; and the water circulation device comprises a circulation water pool. The method mainly comprises the following steps: wiring of each device is completed; parameters of a host panel are set; each device is startedsequentially, and heating power is adjusted; and each circuit is cut off after a temperature rise limit value is achieved. the device can heat the terminal in a condition in which the non-contact transformer terminal is nondestructive, has the advantages of simplicity, high efficiency and high automatic degree, and is mainly used for quickly and efficiently heating the terminal of each type of distribution transformer, and thus, a thermoelectric method is used to discriminate a winding material.

Application Domain

Induction heating controlInduction heating apparatus

Technology Topic

Water circulationSurface plate +11

Image

Examples

Experimental program(1)

Example Embodiment

[0021] The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0022] This embodiment provides a high-frequency non-contact rapid heating device for terminals of a distribution transformer, which specifically includes:

[0023] Temperature control device: It mainly includes temperature collector, temperature control alarm and thermal relay, which can monitor and shut down the heating temperature;

[0024] High-frequency heating device: It mainly includes the host, induction heating coil and insulating hot shoe, which can realize rapid and efficient heating of the terminals of the distribution transformer;

[0025] Water circulation device: It mainly includes a circulating pool and a main engine to realize heating and cooling of the high-frequency heating circuit.

[0026] Moreover, the induction heating coil in the high-frequency heating device can heat the terminals of the distribution transformer, and has the characteristics of size adaptation, simplicity and speed, uniformity and losslessness, safety and efficiency. Insulating hot shoes can overcome the shortcomings of too fast heat dissipation of heating terminals in the air, and have the characteristics of insulation and heat insulation.

[0027] This embodiment also provides a high-frequency non-contact rapid heating method for a distribution transformer terminal, which specifically includes the following steps:

[0028] S1. Connect the temperature control device, high-frequency heating device and water circulation device, adjust the installation position of the insulation hot shoe and induction heating coil to suit the heating demand of the distribution transformer terminal, and ensure that the required installation work is completed;

[0029] S2. Start the water pump M to turn on the cooling water, close the external power switch, the equipment air switch and the panel power switch, the thermal relay is closed, and the "work" indicator light is on;

[0030] S3. Set the "automatic" mode on the host panel, which includes heating, heat preservation and cooling time in sequence. When the cooling is over, the cooling light is off, and a heating process is completed at this point;

[0031] S4. The connected temperature collector is responsible for collecting the temperature value of the metal joint at the heating terminal of the distribution transformer. The threshold value of the connected temperature control alarm is set according to the national standard for the temperature rise limit of the structural parts of the distribution transformer box. After the value exceeds the threshold, an alarm signal can be sent to control the relay to open.

[0032] In specific implementation, such as figure 1 As shown, from the overall point of view, the high-frequency heating device wiring diagram can be composed of three circuits: temperature control circuit I, high-frequency heating circuit II and water circulation circuit III. Here are the following:

[0033] The main components of the temperature control loop are temperature collectors, temperature control alarms and thermal relays: the temperature collectors collect the temperature of the distribution transformer terminals, and the temperature control alarms judge whether it exceeds the threshold set by itself according to the corresponding collected values. If the threshold is exceeded, an alarm signal will be sent and the thermal relay will be activated to disconnect the external circuit.

[0034] The main components of the high-frequency heating circuit are the host, induction heating coils and insulating hot shoes. The host is connected to a 380V power frequency three-phase AC power supply. The front panel of the host has function keys for setting heating current, heating time, holding time, cooling time and "auto/manual". The back of the host is equipped with a three-phase air switch to control the opening of the external circuit. Off. The high-frequency large current output by the host flows to the spiral-shaped induction heating coil, and a strong magnetic flux of instantaneous change in polarity is generated in the coil. The magnetic flux penetrates the entire transformer terminal and generates phase in the terminal opposite to the heating current. Corresponding to a large eddy current. Due to the electrical resistance of the heated metal parts, a lot of Joule heat will be generated, which will increase its temperature rapidly to achieve the purpose of heating. The insulating hot shoe is sleeved outside the heating coil to play the role of insulation and heat insulation.

[0035] The water circulation loop is mainly composed of the main engine and the circulating pool. The circulating pool fills the main engine through a water pump connected to a 220V single-phase AC power source. The main engine and the circulating pool are connected with water inlet and outlet pipes, which can speed up the heat dissipation and cooling of the main engine.

[0036] Such as figure 2 As shown, a high-frequency non-contact rapid heating device and method for a distribution transformer terminal specifically includes the following steps:

[0037] 1. Connect the temperature control circuit, high-frequency heating circuit and water circulation circuit, adjust the installation position of the insulation hot shoe and induction heating coil to suit the heating demand of the distribution transformer terminal, and ensure that the required installation work is completed;

[0038] Specifically, the size of the coil can be adapted according to the size of the heated workpiece.

[0039] When installing the water circulation circuit, due to the excessive pumping force of the water pump, it is necessary to pay attention to the tightness of the two ends of the inlet and outlet pipes. If necessary, the iron hoops can be reinforced to prevent water from overflowing during the heating process.

[0040] The circulating pool can be replaced with a plastic bucket of the same size, and the water storage capacity should not be less than two-thirds of its own volume. The water needs to be changed frequently to ensure the cleanliness of the water quality.

[0041] 2. Start the water pump M to turn on the cooling water, close the external power switch, the equipment air switch and the panel power switch, the thermal relay is closed, and the "work" indicator light is on;

[0042] Specifically, pay attention to the operation sequence of each switch. First start the water pump M to ensure the smoothness of the water circulation circuit, then close the external power switch and the equipment air switch, and finally turn on the panel power switch to ensure the normal operation of the host in the presence of water.

[0043] 3. Set the "Auto" mode on the host panel, which includes heating, heat preservation and cooling time in sequence. When the cooling is over, the cooling light will be off, and a heating process has been completed at this point;

[0044] Specifically, in order to facilitate the operation and increase the degree of automation of the device, the "automatic" mode is generally selected, and the heating time, holding time and cooling time are set in sequence. During the heating process, pay attention to observe whether there is water overflow at the end of each water pipe, whether each display of the host panel is normal, and whether there is local overheating in the heating part.

[0045] 4. The temperature collector is responsible for collecting the temperature value of the metal joint at the heating terminal of the distribution transformer. Excessive temperature will affect the performance of the transformer and it is difficult to achieve non-destructive testing. Therefore, the threshold of the temperature control alarm is set according to the national standard for the temperature rise limit of the structural parts of the distribution transformer box. When the temperature of the metal joint exceeds this After the threshold value, an alarm signal can be sent to control the opening and closing of the thermal relay.

[0046] Specifically, the temperature collector collects the temperature of the heating terminal of the distribution transformer through the thermocouple wire. When attaching the thermocouple to the terminal, pay attention to adding an insulating tape to prevent the eddy current from affecting the accuracy of the thermocouple. When the temperature rise limit is reached, pay attention to the turn-off sequence of the switches. First turn off the panel switch, then turn off the external power switch, and finally turn off the water pump.

[0047] It should be understood that the parts not elaborated in this specification belong to the prior art.

[0048] Although the specific embodiments of the present invention have been described above with reference to the accompanying drawings, those of ordinary skill in the art should understand that these are only examples, and various modifications or modifications can be made to these embodiments without departing from the principles and principles of the present invention. substance. The scope of the present invention is limited only by the appended claims.

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Classification and recommendation of technical efficacy words

Heating fast

High-frequency non-contact rapid heating device and method for distribution transformer terminal

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

Example Embodiment

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Description & Claims & Application Information

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