Portable transformer coil insulation tester

Abstract

The utility model relates to the field of transformer coil insulation detection, in particular to a portable transformer coil insulation tester, which comprises an insulation detection module, a voice alarm module, a power supply module and a test terminal, the insulation detection module comprises an impedance matching unit and an optocoupler detection unit, the impedance matching unit comprises resistors R1, R2 and R3, one end of the resistor R1 is connected with a power supply VCC, and the other end of the resistor R2 is connected with an optocoupler detection unit. The other end of the resistor R1 is connected with the test point I, one path of the test point II is connected to a pin 1 of the optocoupler chip through the resistor R3, the other path of the test point II is connected to a pin 2 of the optocoupler chip through the resistor R2, the pin 2 of the optocoupler chip is grounded, a pin 3 of the optocoupler chip is connected with a power supply VCC and is connected to an enabling end of the alarm module, and the test terminal is respectively connected with the test point I and the test point II. The device is small and exquisite, is convenient to carry, is high in detection precision, can achieve the in-factory detection of a lead, and discovers the insulation damage of the lead in advance.

Description

Technical Field

[0001] The utility model relates to the field of transformer coil insulation detection, in particular to a portable transformer coil insulation tester. Background Art

[0002] As a key equipment of the power system, the transformer plays an important role in the safe and stable operation of the system. The coil is the core component of the transformer. Reliable coil insulation is of great significance to the long-term stable operation of the transformer, especially for high-voltage power transformers such as UHV and converter transformers.

[0003] At present, the insulation detection between transformer coil conductors is mainly carried out using a multimeter or an insulation megger, which is inconvenient to carry and measure. Some people use the method of modifying doorbells, which is convenient for detection but has problems such as low detection accuracy, low voice alarm sound, and poor battery life. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a portable transformer coil insulation tester, which is small in size, easy to carry, and has high detection accuracy. It can realize factory-entry detection of wires and detect wire insulation damage in advance.

[0005] In order to solve the technical problem, the technical solution adopted by the utility model is: a portable transformer coil insulation tester, including an insulation detection module, a voice alarm module, a power supply module and a test terminal, the insulation detection module includes an impedance matching unit and an optocoupler detection unit, the impedance matching unit includes resistors R1, R2, and R3, one end of the resistor R1 is connected to the power supply VCC, the other end of the resistor R1 is connected to the test point I, the test point II is connected to the pin 1 of the optocoupler chip through the resistor R3, the other end of the test point II is connected to the pin 2 of the optocoupler chip through the resistor R2, the pin 2 of the optocoupler chip is grounded, the pin 3 of the optocoupler chip is connected to the power supply VCC and to the enable end of the alarm module, and the test terminals are respectively connected to the test point I and the test point II.

[0006] Furthermore, the alarm module includes a doorbell chip and a speaker, the enable end of the doorbell chip is connected to pin 3 of the optocoupler, the power supply end of the doorbell chip is connected to the power supply VCC, and the output end of the doorbell chip is connected to the speaker.

[0007] Furthermore, the insulation detection module, voice alarm module and power module are installed in the chassis. The chassis includes a cover and a body. The cover is provided with a speaker hole for fixing the speaker. The body is provided with a charging terminal and a power switch. The test terminal extends from the inside of the chassis to the outside of the chassis.

[0008] Furthermore, the test terminal uses an alligator clip terminal or a test probe.

[0009] Furthermore, a diode D1 and a capacitor C1 are connected in parallel between pin 1 and pin 2 of the optocoupler chip, the positive electrode of the diode D1 is connected to pin 2 of the optocoupler chip, the negative electrode of the diode D1 is connected to pin 1 of the optocoupler chip, and a resistor R4, a capacitor C2 and a resistor R5 are connected in parallel between pin 3 and pin 4 of the optocoupler chip.

[0010] Furthermore, the power switch is connected between the power source VCC and the resistor R1 .

[0011] The beneficial effects of the utility model are as follows: the device of the utility model is small, easy to carry, and has high detection accuracy. It can not only realize the detection of wires entering the factory and discover the insulation damage of the wires in advance; but also can detect the insulation damage of the wires that may occur in the process of transformer coil winding, coil baking, and body pressing, and give voice alarm prompts for the insulation-damaged coil wires, so as to realize the timely discovery and treatment of insulation damage between coil wires, reduce the rework and rewinding of coils, and save manpower, material resources and processing time. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the circuit schematic diagram of a portable transformer coil insulation tester;

[0013] Figure 2 This is a schematic diagram of the chassis of a portable transformer coil insulation tester;

[0014] Figure 3 This is a schematic diagram of the internal structure of a portable transformer coil insulation tester;

[0015] In the figure: 1. box cover, 2. box body, 3. charging terminal, 4. power switch, 5. lithium battery pack, 6. insulation detection module, 7. test terminal, 8. speaker. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0017] Example 1

[0018] This embodiment discloses a portable transformer coil insulation tester. Figure 3As shown, it includes an insulation detection module, a voice alarm module, a power module and a test terminal. The insulation detection module includes an impedance matching unit and an optocoupler detection unit. The impedance matching unit includes resistors R1, R2 and R3. The optocoupler detection unit includes an optocoupler chip and its auxiliary circuits. The alarm module includes a doorbell chip and a speaker. One end of the resistor R1 is connected to the power supply VCC through a power switch, and the other end of the resistor R1 is connected to the test point I. The test point II is connected to the pin 1 of the optocoupler chip through the resistor R3, and the other end of the test point II is connected to the pin 2 of the optocoupler chip through the resistor R2. The pin 2 of the optocoupler chip is grounded, and the pin 3 of the optocoupler chip is connected to the power supply VCC and connected to the enable end of the doorbell chip. The power supply end of the doorbell chip is connected to the power supply VCC, and the output end of the doorbell chip is connected to the speaker. The test terminals are respectively connected to the test point I and the test point II.

[0019] The auxiliary circuit of the optocoupler chip includes a diode D1, a capacitor C1, a capacitor C2, a resistor R4 and a resistor R5. The diode D1 and the capacitor C1 are connected in parallel between pin 1 and pin 2 of the optocoupler chip. The positive electrode of the diode D1 is connected to pin 2 of the optocoupler chip, the negative electrode of the diode D1 is connected to pin 1 of the optocoupler chip, and the capacitor C2, the resistor R4 and the resistor R5 are connected in parallel between pin 3 and pin 4 of the optocoupler chip.

[0020] The working principle of the insulation tester described in this embodiment is: one test terminal is connected to any wire of the coil, and the other test terminal is connected to any other wire of the coil. If the insulation of the coil is good, there is no input voltage at test point II, the optocoupler chip is not turned on, the doorbell chip behind it is also not turned on, the speaker does not sound, and no alarm occurs; if the insulation layer of the coil is damaged, the power supply is turned on through the coil, a voltage is generated at test point II, the optocoupler chip is turned on, the doorbell chip behind it is also turned on, the speaker sounds, and an alarm prompt is generated.

[0021] like Figure 2 , 3 As shown, the insulation detection module 6, the voice alarm module, and the power module are installed in the chassis. The chassis includes a cover 1 and a body 2. The cover 1 is provided with a speaker hole for fixing a speaker. The speaker 8 is fixed in the speaker hole. The body 2 is provided with a charging terminal 3 and a power switch 4. The test terminal 7 extends from the inside of the chassis to the outside of the chassis.

[0022] In this embodiment, the impedance matching unit adjusts the R1-R3 resistors to detect the insulation status of transformer coils with different structures. The optocoupler detection unit uses the TLPxx series optocoupler chip to determine the insulation status between any two wires. The doorbell FLMxx series IC chip is used to control the speaker to broadcast the fault signal, realizing the sound alarm of insulation fault between any two wires of the transformer coil.

[0023] The power module adopts a large-capacity lithium battery pack 5 to output a +4.1V voltage signal, which not only realizes the power supply of each module of the entire device, but also provides power support for the insulation fault test circuit between the transformer coil wires.

[0024] The test terminal uses an alligator clip terminal or a test probe to achieve reliable access to any two wires of the transformer coil.

[0025] The chassis includes a cover 1 and a body 2, which are made of bent metal sheets and assembled through fasteners to install and fix each module to achieve structural support for the entire device.

[0026] The box cover 1 is matched with the speaker 8 to design a speaker hole so that the speaker sound can be transmitted outwards.

[0027] The box body 2 adopts an integrated design of the device box body and the mounting hole, which is convenient for the device to be installed and fixed.

[0028] The charging terminal 3 uses a 5.5*2.1mm socket to charge the lithium battery pack 5 .

[0029] The power switch 4 adopts a 10*15mm boat-type switch to realize the power supply switching of the lithium battery pack 5 to the entire device module and the test circuit.

[0030] The speaker 8 adopts a speaker to play the alarm sound.

[0031] Using the insulation tester described in this embodiment to perform insulation testing includes the following steps:

[0032] S01) Press the power switch 4 to power on the entire device, short-circuit the two test terminals 7, and perform a functional test before the device is put into use. The device alarm proves that it is working normally;

[0033] S02) Connect one test terminal 7 to one wire of the coil, and connect another test terminal 7 to any other wire of the coil;

[0034] S03) The insulation detection module 6 collects the potential information of the two test terminals 7 to determine the insulation status of the coil wire;

[0035] S04) Voice Alarm Module The voice control unit receives the coil conductor insulation fault alarm indication sent by the insulation detection module 6 and sends it to the voice broadcast unit speaker 8 for playing.

[0036] S05) Repeating operations S02)-S04) can realize the insulation status test of any two wires of the transformer coil.

[0037] What is shown above is only a preferred embodiment of the utility model, and is not intended to limit the scope of implementation of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of this patent, and these improvements and substitutions should also be regarded as the scope of protection of this patent.

Claims

1. A portable transformer coil insulation tester, characterized in that: It includes an insulation detection module, a voice alarm module, a power supply module and a test terminal. The insulation detection module includes an impedance matching unit and an optocoupler detection unit. The impedance matching unit includes resistors R1, R2 and R3. One end of the resistor R1 is connected to the power supply VCC, and the other end of the resistor R1 is connected to the test point I. One end of the test point II is connected to the pin 1 of the optocoupler chip via the resistor R3, and the other end of the test point II is connected to the pin 2 of the optocoupler chip via the resistor R2. The pin 2 of the optocoupler chip is grounded, and the pin 3 of the optocoupler chip is connected to the power supply VCC and to the enable end of the alarm module. The test terminals are respectively connected to the test point I and the test point II.

2. The portable transformer coil insulation tester according to claim 1, characterized in that: The alarm module includes a doorbell chip and a speaker. The enable end of the doorbell chip is connected to pin 3 of the optocoupler, the power supply end of the doorbell chip is connected to the power supply VCC, and the output end of the doorbell chip is connected to the speaker.

3. The portable transformer coil insulation tester according to claim 2, characterized in that: The insulation detection module, voice alarm module and power module are installed in the chassis. The chassis includes a cover and a body. The cover is provided with a speaker hole for fixing the speaker. The body is provided with a charging terminal and a power switch. The test terminal extends from the inside of the chassis to the outside of the chassis.

4. The portable transformer coil insulation tester according to claim 1, characterized in that: The test terminals use alligator clip terminals or test probes.

5. The portable transformer coil insulation tester according to claim 1, characterized in that: A diode D1 and a capacitor C1 are connected in parallel between pin 1 and pin 2 of the optocoupler chip, the positive electrode of the diode D1 is connected to pin 2 of the optocoupler chip, the negative electrode of the diode D1 is connected to pin 1 of the optocoupler chip, and a resistor R4, a capacitor C2 and a resistor R5 are connected in parallel between pin 3 and pin 4 of the optocoupler chip.

6. The portable transformer coil insulation tester according to claim 3, characterized in that: The power switch is connected between the power source VCC and the resistor R1 .

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