CN203102001U - Power Transformer Oil Surface Temperature Controller Calibration Device - Google Patents

Abstract

The utility model relates to a check device for an oil level temperature controller of a power transformer. The check device is structurally characterized in that a composite sensor is arranged in a constant-temperature oil tank and connected with a pointer temperature meter, a signal contact state display instrument, a temperature display instrument and a heat resistance instrument respectively; the pointer temperature meter is connected with the signal contact state display instrument; and in the signal contact state display instrument, a light-emitting diode is connected in parallel into a circuit board with a battery. The check device can be used for saving the working time and the workload and reducing unnecessary erroneous judgments in the test process, only needs to be operated by few persons before test, can be used for achieving the purpose of automatic checking in the test process, and has numerous outstanding advantages of low manufacture cost, simplicity in operation, accurate test result, clear data and the like.

Description

Power Transformer Oil Surface Temperature Controller Calibration Device

technical field

The utility model relates to a calibration device in a power system, in particular to a calibration device for an oil surface temperature controller of a power transformer, which is used for calibration of various temperature instruments, temperature measuring resistors and winding temperature controllers in the power system It is widely used in the field of electric power test.

Background technique

Transformer operating temperature control directly affects the economical and safe operation of the transformer, as well as the stability of the power grid. This requires the temperature controller on the transformer to be able to accurately indicate the temperature of the transformer, to send out an alarm signal in time when the temperature of the transformer rises, and to start the air cooling equipment to cool down in time. It can monitor the transformer temperature remotely and accurately in real time. In the past, the calibration of thermostats required three steps: temperature, resistance, and contacts, and at least 3 people were required to cooperate to complete it, which took about 4 hours. Moreover, the thermostat consists of 6 sets of contact contacts evenly distributed in a circular joint with a diameter of only 25mm, and the arrangement is dense. In many years of test work, it has been found that there are uncertain factors in the working method used to verify the thermostat. . Whether the first switch contact is operating accurately at the set temperature, the method of using a multimeter to touch the thermostat will inevitably touch adjacent contacts during the test, or touch other contacts by mistake, which will bring problems to the calibration work. Unnecessary trouble and a lot of repetitive work will be caused, and misjudgment of test results will also occur. The accuracy, scientificity and intelligence of the test must be required in the power production test. Obviously, the traditional test method cannot meet the rapid development of the current power grid equipment.

Contents of the invention

The utility model aims at the problems existing in the above-mentioned prior art, and provides a verification device for an oil surface temperature controller of a power transformer, which solves the problem that the prior art easily leads to misjudgment in the actual verification operation.

The technical scheme of the utility model is as follows:

The composite sensor temperature package is placed in the constant temperature oil tank, and the composite sensor is respectively connected to the pointer thermometer, the signal contact state display device, the temperature display device and the thermal resistance device; the pointer thermometer is connected to the signal contact state display device; the signal contact state display device is , the LEDs are connected in parallel to the circuit board with the battery.

The light emitting diodes are 6 light emitting diodes of different colors.

Described battery is 2 section No. 5 dry batteries.

The composite sensor is respectively connected with the temperature display instrument through two Pt100 resistance modules.

The composite sensor is connected with a constant current source.

The terminal of the connecting cable between the pointer thermometer and the signal contact state display instrument is an aviation connector.

The advantages and effects of the utility model are as follows:

1. The utility model can meet the requirements of the transformer temperature controller verification procedure, and can display the test results accurately and intuitively.

2. The utility model can solve the safety problems existing in previous tests, improves the safety of calibration, and reduces the damage rate of test equipment.

3. The connection cable used for the connection cable between the pointer thermometer and the signal contact state display instrument is an aviation connector, which has the characteristics of shockproof, waterproof, and safe plug-in, which can reduce the influence of the test environment on the test results.

4. The utility model can be designed and improved for compatibility and scalability according to the actual situation of the power system. For example, the temperature display instrument can be designed to have the function of circuit fault judgment.

5. The utility model adopts a combined structure, and the replacement of each component is convenient. The structure is reasonable, the performance is superior, and the matching is complete, which can meet the calibration requirements of various types of thermostats in actual work.

Compared with the old-fashioned test method of using a multimeter to judge in the past, it saves working time and workload, and reduces unnecessary misjudgments in the test process. This set of equipment only needs a little manual operation before the test, and the test process realizes the purpose of automatic calibration, and has many significant advantages such as low cost, simple operation, accurate test results, and clear data.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a schematic diagram of the principle of the signal contact state display device of the present invention.

In the figure, 1. Temperature display instrument I, 2. Thermal resistance instrument, 3. Temperature display instrument II, 4. Composite sensor, 5. Oil tank, 6. Pointer thermometer, 7. Signal contact state display instrument, 401, DIN42554, 402, Pt100, 701, plug, 702, lead terminal, 703, light emitting diode.

Detailed ways

Example 1

The composite sensor 4 temperature package is placed in the constant temperature oil tank 5, and the composite sensor 4 is respectively connected to the pointer thermometer 6, the signal contact status display instrument 7, the temperature display instrument I 1, the temperature display instrument II3 and the thermal resistance instrument 2; the pointer thermometer 6 and the signal contact status display Instrument 7 is connected, and the terminal of the connecting cable between the pointer thermometer and the signal contact state display instrument is an aviation connector; the signal contact state display instrument is that 6 light-emitting diodes 703 of different colors are connected in parallel with 2 AAA dry batteries circuit board. The composite sensor adopts a DIN42554 standardized thermometer base, and is respectively connected to the temperature display instrument through two Pt100 resistance modules.

Example 2

The composite sensor is connected with a constant current source. Other structures are with embodiment 1.

Working principle and process of the present utility model are as follows:

During the test, put the composite sensor temperature package of the thermostat in the constant temperature oil tank that can be heated automatically. The cable connector of the thermostat is connected to the signal contact state display instrument. The installed LEDs do not emit light. When the temperature of the oil tank rises, the volume of the temperature-sensing medium in the temperature-sensing part of the thermostat changes accordingly. This volume increment is transmitted to the elastic element of the pointer thermometer through the capillary, so that it produces a corresponding displacement. After the displacement is amplified by the mechanism, it will drive the pointer to indicate the temperature change, and drive the micro temperature switch to close. At this time, you can clearly and intuitively see that the circuit of the light-emitting diode at the contact is connected and glows. As the temperature of the oil tank continues to rise , other light-emitting diodes will also emit light at their set contact action temperature. When the temperature of the oil tank drops, the volume of the temperature-sensing medium inside the thermostat becomes smaller, the contact is disconnected, and the light-emitting diode goes out. In this way, the verification of the contact state of the thermostat is successfully completed. The two Pt100 resistance modules in the composite sensor are respectively connected to the corresponding temperature display instrument fixed on the test bench. When using a platinum thermal resistance to measure temperature, connect the platinum thermal resistance to the temperature display device, and measure the resistance value of the platinum thermal resistance through the temperature display device, thereby displaying the temperature. With the continuous improvement of the safety requirements for transformer operation, the winding temperature controller, as a winding temperature change monitoring device, has been more and more widely used in transformers. A constant current source is also installed on the transformer calibration device to meet the calibration of the winding thermostat. The compound sensor of the winding temperature controller is inserted into the oil hole on the top of the transformer oil tank. When the transformer load is zero, the reading of the winding thermometer is the temperature of the oil surface on the top layer of the transformer oil tank. When the transformer is loaded, the current proportional to the load taken out by the transformer current transformer is adjusted by the current matching device and flows through the heating wire embedded in the composite sensor, and the heating wire generates heat to make the temperature in the composite sensor The medium expands further, and the displacement of the elastic element of the pointer thermometer increases. Use connecting wires to connect the corresponding contacts of the calibrated winding thermostat to the constant current source. By adjusting the current output of the constant current source, simulate the temperature rise of the transformer under load in actual operation. An ammeter is installed between the devices to monitor the current value provided by the constant current source at any time.

Claims (6)

1. power transformer pasta temperature controller calibration equipment is characterized in that the compound sensor thermometer bulb places thermostatic oil bath, and compound sensor is concatenation pointer thermometer, signal contact state display instrument, Wen Xianyi and thermal resistance instrument respectively; The pointer thermometer is connected with signal contact state display instrument; Described signal contact state display instrument is the light emitting diode wiring board that has battery that inserts in parallel.

2. power transformer pasta temperature controller calibration equipment according to claim 1 is characterized in that described light emitting diode is 6 different color LEDs.

3. power transformer pasta temperature controller calibration equipment according to claim 1 is characterized in that described battery is No. 5 dry cells of 2 joints.

4. power transformer pasta temperature controller calibration equipment according to claim 1 is characterized in that described compound sensor is connected with Wen Xianyi respectively by two Pt100 resistive module.

5. power transformer pasta temperature controller calibration equipment according to claim 1 is characterized in that described compound sensor connects constant current source.

6. power transformer pasta temperature controller calibration equipment according to claim 1 is characterized in that the connector lug of the stube cable of described pointer thermometer and signal contact state display instrument is an Aviation Connector.

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