Testing device for temperature control box of dry-type transformer
By designing a dry transformer temperature control box testing device, using phase sequence switching switch and temperature test simulation resistance to simulate thermistor resistance values at different temperatures, the problem of inefficient testing in the prior art is solved, and the rapid and accurate testing of the temperature control box is achieved.
Patent Information
- Application Number
- CN202421681776.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-16
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-07-16
AI Technical Summary
In the prior art, when testing dry transformer temperature control boxes, wiring needs to be frequently replaced and resistance value is adjusted, resulting in inefficient testing.
A dry-type transformer temperature control box testing device is designed, which is connected to the connector of the thermistor connected to the temperature control box through the temperature control box. The phase sequence switching switch, test temperature switching switch and temperature test simulation resistor are used to simulate the thermistor resistance values at different temperatures to achieve rapid and accurate testing of the temperature control box.
The device can quickly and accurately perform temperature-controlled box testing, avoiding frequent wiring replacement and resistance adjustment steps, significantly improving the testing efficiency.
Smart Images
Figure CN222748883U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electrical equipment, in particular to a dry-type transformer temperature control box testing device. Background Art
[0002] In the power system of the subway, a large number of dry-type transformers are needed. Among them, in the dry-type transformer, a temperature control box is needed to detect the temperature of the coil and the core of the transformer and send out an alarm or trip signal after the coil and the core of the transformer reach the set temperature to protect the safe and normal operation of the transformer. Therefore, the normal operation of the temperature control box is very important, and the temperature control box needs to be tested regularly. Among them, the temperature control box detects the temperature of the coil and the core of the transformer through multiple groups of thermistors. Specifically, the thermistors connected to the temperature control box include four groups of PT100, one group of PTC130 and one group of PTC150. When each group of thermistors reaches the set temperature, the temperature control box needs to take corresponding actions to protect the transformer. A normally operating temperature control box will sound an alarm when any group of the thermistors reaches the set temperature. When any group of PT100 reaches the set temperature, and both PTC130 and PTC150 reach the set temperature, a tripping action will be triggered. The test of the temperature control box is to test the action of the above temperature control box. Specifically, the thermistor connected to the temperature control box is replaced with a test resistor, and the resistance value of the test resistor is adjusted so that the test resistor reaches the resistance value of the thermistor at different temperatures to simulate the thermistor at different temperatures. At present, the test of the temperature control box uses three resistance boxes to simulate the resistance values of PT100, PTC130 and PTC150 at different temperatures respectively, and connects them to the corresponding interfaces of the temperature control box for testing. There are four groups of PT100, which need to be wired and tested separately, which reduces the test efficiency. During the test, it is necessary to look up the table and adjust the resistance value of the resistance box to simulate the resistance value of the thermistor at different temperatures, which also affects the test efficiency of the temperature control box. Utility Model Content
[0003] The utility model aims to provide a dry-type transformer temperature control box testing device, specifically to provide a device which is simple to operate and can quickly and accurately test the temperature control box.
[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a test device for a temperature control box of a dry-type transformer, comprising a temperature control box connector, a test power supply, a phase sequence switching switch, a first test temperature switching switch, a first temperature test simulation resistor, a second test temperature switching switch and a second temperature test simulation resistor, the temperature control box connector is connected to a connector connected to a thermistor on the temperature control box to be tested, the temperature control box connector is connected to the first temperature test simulation resistor and the second temperature test simulation resistor through multiple relay switches, and the test power supply controls the multiple relay switches through the phase sequence switching switch, the first test temperature switching switch and the second test temperature switching switch.
[0005] Specifically, it also includes a temperature fine-tuning switch and a temperature fine-tuning analog resistor. The temperature fine-tuning switch controls whether the temperature fine-tuning analog resistor is connected in series with the first temperature test analog resistor through a relay switch.
[0006] Specifically, the phase sequence switching switch, the first test temperature switching switch and the second test temperature switching switch are band switches.
[0007] Specifically, the temperature fine-tuning analog resistor is composed of a dip switch and a plurality of resistor groups.
[0008] Specifically, the test power supply includes a battery, a boost circuit, a charging circuit and a power display circuit. The charging circuit and the power display circuit are electrically connected to the battery, and the battery is connected to the power supply required by the boost circuit output relay switch.
[0009] The beneficial effects of the utility model are as follows: by setting the temperature control box joint to be directly connected to the thermistor connection interface on the temperature control box, and by setting the phase sequence switching switch to simulate the switching of four groups of PT100 thermistors, the test temperature switching switch and different temperature test simulation resistors are used to simulate the resistance values of different thermistors at different temperatures, thereby realizing fast and accurate testing of the temperature control box. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Attached Figure 1 Schematic diagram of the overall circuit connection of the test device of the dry-type transformer temperature control box in the embodiment. DETAILED DESCRIPTION
[0011] Example 1, reference Figure 1A test device for a dry-type transformer temperature control box, comprising a temperature control box connector, a test power supply, a phase sequence switching switch, a first test temperature switching switch, a first temperature test simulation resistor, a second test temperature switching switch and a second temperature test simulation resistor, wherein the temperature control box connector is connected to a connector connected to a thermistor on the temperature control box to be tested, and the temperature control box connector is connected to the first temperature test simulation resistor and the second temperature test simulation resistor through multiple relay switches, and the test power supply controls the multiple relay switches through the phase sequence switching switch, the first test temperature switching switch and the second test temperature switching switch.
[0012] In this embodiment, the phase sequence switching switch is used to switch the first temperature test simulation resistor to different pins of the temperature control box connector by controlling the state of the relay switch, thereby switching the simulation of different groups of PT100 thermistors. The first test temperature switching switch is used to switch the resistance value of the first temperature test simulation resistor connected to the temperature control box connector, thereby simulating the resistance value of the PT100 thermistor at different temperatures. The first temperature test simulation resistor connected to the temperature control box connector can be adjusted by switching the first test temperature switching switch, wherein the first temperature test simulation resistor can be composed of multiple groups of resistors connected in series. The first test temperature switching switch is used to adjust the number of resistors of the first temperature test simulation resistor connected to the temperature control box connector by controlling the on and off of different relay switches. The more groups of resistors are connected, the larger the resistance value is, thereby simulating the resistance value of PT100 at higher temperatures. In addition, it should be noted that because the temperature control box will still trigger an alarm when the resistance value connected to the pins of the four groups of PT100 connected to the temperature control box is too low or open, and when testing, the first temperature test simulation resistor is only connected to the pins corresponding to one group of PT100 of the temperature control box; therefore, in order to avoid the alarm being triggered due to the lack of resistors connected to the pins corresponding to the other three groups of PT100, it is necessary to set a group of initial resistors on the relay switch corresponding to the phase sequence switching switch (each group of pins of the four groups of PT100 connected to the temperature control box corresponds to a relay switch), and the relay switch is a double-controlled relay switch, specifically a double-pole double-throw relay switch. When the phase sequence switching switch controls one of the relay switches to connect the first temperature test simulation resistor to one of the groups of pins of the PT100 connected to the temperature control box, the other three groups of pins can be connected to their corresponding initial resistors through their corresponding relay switches. The second temperature test simulation resistor is used to simulate the resistance of PTC130 and PTC150 thermistors at different temperatures, and the second test temperature switching switch is used to switch the resistance of the second temperature test simulation resistor connected to the temperature control box connector, wherein the second temperature test simulation resistor is composed of multiple groups of independent resistors, which are used to simulate the resistance of PTC130 and PTC150 thermistors at different set temperatures. The second temperature switching switch can control the on and off of different relay switches, thereby switching the resistance of the second temperature test simulation resistor connected to the temperature control box connector. When the test device of this embodiment tests the temperature control box, it only needs to unplug the connector of the thermistor on the temperature control box, plug in the temperature control box connector of the test device, and select parameters through the phase sequence switching switch, the first test temperature switching switch and the second test temperature switching switch, so as to realize the test of the temperature control box without frequently changing the wiring and adjusting the resistance value, thereby effectively improving the test efficiency. Among them, the above-mentioned phase sequence switching switch, the first test temperature switching switch and the second test temperature switching switch can preferably adopt a band switch.The test power supply of this embodiment includes a battery, a boost circuit, a charging circuit and a power display circuit. The charging circuit and the power display circuit are electrically connected to the battery. The battery is connected to the boost circuit to output the power required by the relay switch. The test power supply can power the relay switch so that the relay switch can perform corresponding actions according to the states of the phase sequence switching switch, the first test temperature switching switch and the second test temperature switching switch. Among them, the charging circuit can charge the battery, and the power display circuit can detect and display the battery power by connecting to the battery, so that the operator can know the remaining power of the battery in time. The battery outputs the power required by the relay switch through the boost circuit to power the relay switch.
[0013] Specifically, the test device of this embodiment also includes a temperature fine-tuning switch and a temperature fine-tuning analog resistor, and the temperature fine-tuning switch controls whether the temperature fine-tuning analog resistor is connected in series with the first temperature test analog resistor through a relay switch. The temperature fine-tuning switch can control whether the temperature fine-tuning analog resistor is connected in series with the first temperature test analog resistor through the relay switch, so as to select whether to start the temperature fine-tuning function. When the resistance value of the first temperature test analog resistor needs to be fine-tuned during the test, the temperature fine-tuning analog resistor can be connected in series with the first temperature test analog resistor by starting the temperature fine-tuning function and then connected to the temperature control box connector. By adjusting the resistance value of the fine-tuning resistor, the temperature simulation value can be adjusted. Among them, the temperature fine-tuning analog resistor is composed of a dip switch and a plurality of groups of resistors. The temperature fine-tuning analog resistor adjusts the resistance value of the temperature fine-tuning analog resistor by coordinating the state of the dip switch with a plurality of groups of resistors. By controlling the dip switch, the number of resistors connected in series with the first temperature test analog resistor can be adjusted, thereby adjusting its resistance value.
[0014] Of course, the above are only preferred implementations of the present utility model, and are not intended to limit the scope of use of the present utility model. Therefore, any equivalent changes made to the principles of the present utility model should be included in the protection scope of the present utility model.
Claims
1. A dry-type transformer temperature control box test device, characterized in that: It includes a temperature control box connector, a test power supply, a phase sequence switching switch, a first test temperature switching switch, a first temperature test simulation resistor, a second test temperature switching switch and a second temperature test simulation resistor. The temperature control box connector is connected to a connector connected to a thermistor on the temperature control box to be tested. The temperature control box connector is connected to the first temperature test simulation resistor and the second temperature test simulation resistor through multiple relay switches. The test power supply controls the power supply to the multiple relay switches through the phase sequence switching switch, the first test temperature switching switch and the second test temperature switching switch.
2. A dry-type transformer temperature control box testing device according to claim 1, characterized in that: It also includes a temperature fine-tuning switch and a temperature fine-tuning analog resistor. The temperature fine-tuning switch controls whether the temperature fine-tuning analog resistor is connected in series with the first temperature test analog resistor through a relay switch.
3. A dry-type transformer temperature control box testing device according to claim 1, characterized in that: The phase sequence switching switch, the first test temperature switching switch and the second test temperature switching switch are band switches.
4. A dry-type transformer temperature control box testing device according to claim 2, characterized in that: The temperature fine-tuning analog resistor is composed of a dip switch and a plurality of resistor groups.
5. A dry-type transformer temperature control box testing device according to claim 1, characterized in that: The test power supply includes a battery, a boost circuit, a charging circuit and a power display circuit. The charging circuit and the power display circuit are electrically connected to the battery, and the battery is connected to the boost circuit to output the power required by the relay switch.