Insulation detection instrument

Abstract

The embodiment of the utility model provides an insulation detection instrument, and belongs to the technical field of electrical electronics. The insulation detection instrument is used for detecting whether insulation of insulation equipment is normal or not and comprises a wiring terminal, a diode, a first triode, a first alarm, a power source and a resistor R1, the first triode and the first alarm are connected in series, and a series circuit formed by the first triode and the first alarm is connected to the two ends of the power source in parallel; the cathode of the diode is connected with the base of the first triode; one end of the wiring terminal is connected with the anode of the power supply, and the other end is connected with the anode of the diode and the resistor R1; and two ends of the resistor R1 are respectively connected with the other end of the wiring terminal and the emitting electrode of the first triode. According to the invention, the online insulation detection of the insulation equipment is realized, the problem that the insulation detection cannot be carried out during the operation of the equipment is solved, and the normal operation of the equipment is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the electrical and electronic technical field, in particular to an insulation detection instrument. BACKGROUND

[0002] Normal electrical insulation is the guarantee of safe operation of electrical and instrument equipment, and the vast majority of damage to electrical and instrument equipment is caused by insulation damage. Insulation damage is often caused by external moisture, insulation resistance drop, and then current circulation loop is formed in the insulation skin, thereby causing insulation breakdown and electrical accidents.

[0003] Instrument equipment such as flow meters, differential pressure transmitters, radar level meters, etc. must be closed according to the specification requirements, especially in explosion-proof applications, a flexible connecting pipe is used, but due to insulation aging or installation reasons, rainwater or condensed water droplets may enter the interior, reducing the internal insulation and damaging the instrument. For example, high-voltage cable trenches and bridge interiors are prone to water ingress, and some cable trenches have accumulated water for years. Once the cable skin is damaged, insulation breakdown will occur, causing large-scale power outages and even personnel injury accidents.

[0004] In view of the above problems, insulation detection of the equipment is needed, and most of the existing technologies for insulation detection are to detect after power failure, which cannot determine the insulation condition during operation and cannot guarantee the normal operation of electrical and instrument equipment. The on-line insulation detection technology cannot solve the problem of power supply for insulation detection, such as high-voltage cables, which require low-voltage input, and the insulation detection between low-voltage and high-voltage is difficult and expensive, so the on-line insulation detection equipment is expensive. CONTENT OF THE INVENTION

[0005] The purpose of the embodiments of the present application is to provide an insulation detection instrument for solving at least one problem existing in the prior art.

[0006] In order to achieve the above-mentioned purpose, the embodiments of the present application provide an insulation detection instrument for detecting whether the insulation of an insulation equipment is normal, the insulation detection instrument comprising: a terminal, a diode, a first triode, a first alarm, a power supply, and a resistor R1, wherein the first triode and the first alarm are connected in series, and the series circuit formed by the two is connected in parallel across the power supply; the cathode of the diode is connected to the base of the first triode; one end of the terminal is connected to the positive electrode of the power supply, and the other end of the terminal is connected to the anode of the diode and the resistor R1; and the two ends of the resistor R1 are respectively connected to the other end of the terminal and the emitter of the first triode.

[0007] Optionally, the first alarm is a buzzer.

[0008] Optionally, the first triode is a 9013 triode.

[0009] Optionally, the insulation detection instrument further comprises a second triode and a second alarm, the base of the second triode is connected to the emitter of the first triode, the collector of the second triode is connected to the collector of the first triode, and the connection is in the form of a Darlington tube, for increasing the amplification of the current; the second alarm is connected in parallel across the first alarm.

[0010] Optionally, the second alarm is a light-emitting diode.

[0011] Optionally, the light-emitting diode is connected in series with a resistor R3, and the series circuit formed by the two is connected in parallel across the first alarm.

[0012] Optionally, the second triode is a 9013 triode.

[0013] Optionally, the insulation detection instrument further comprises:

[0014] An adjustable resistor, one end of the adjustable resistor is connected to the resistor R1, and the other end is connected to the emitter of the second triode.

[0015] Optionally, the insulation detection instrument further comprises a capacitor, the capacitor is connected in parallel across the power supply, for stabilizing the power supply voltage.

[0016] Optionally, the power supply is a silver-zinc battery or a solar cell.

[0017] Through the above technical solution, the present disclosure connects the triode and the alarm in series, connects the diode and the triode, and connects the terminal and the positive pole of the power supply, one end of the diode is connected to the resistor R1, the resistor R1 is connected to the emitter of the triode, and the other end is connected to the negative pole of the power supply. Through this connection mode, when the insulation of the to-be-tested insulation equipment is normal, the resistance of the terminal is equivalent to infinity, the voltage of the diode is 0, and the triode is not conductive; when the insulation decreases, the resistance of the terminal decreases, causing the anode voltage of the diode to rise, and when the voltage rises to exceed the breakdown voltage of the diode and the triode, the triode is conductive, the alarm is alarmed, and thus the insulation of the to-be-tested equipment can be detected; and when the insulation of the to-be-tested equipment is normal, the triode remains in a cut-off state. Through this mode, the equipment whose insulation needs to be detected is directly connected to the two ends of the terminal for insulation detection, without the need to stop power supply of the equipment, and insulation detection during normal operation of the equipment is realized.

[0018] Other features and advantages of the embodiments of the present disclosure will be described in detail in the following specific implementation part. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of embodiments of the application, and are incorporated in and constitute a part of this specification, illustrate embodiments of the application, and together with the description serve to explain embodiments of the application, but do not limit the application. In the drawings:

[0020] Figure 1 is a structural diagram of an insulation detection instrument provided by an embodiment of the present disclosure;

[0021] Figure 2 is a structural diagram of another insulation detection instrument provided by an embodiment of the present disclosure.

[0022] Legend of reference signs

[0023] 1, power supply; 2, terminal; 3, resistor R1; 4, diode; 5, buzzer; 6, first triode; 7, second triode; 8, light-emitting diode; 9, adjustable resistor; 10, capacitor; 11, resistor R3. DETAILED DESCRIPTION

[0024] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0025] Figure 1 is a circuit structural diagram of an insulation detection instrument provided by an embodiment of the present disclosure. As shown in Figure 1 the insulation detection instrument includes a terminal, a diode, a first triode, a first alarm, a power supply, and a resistor R1, wherein the first triode and the first alarm are connected in series, and the series circuit formed by the first triode and the first alarm is connected in parallel across the power supply; the cathode of the diode is connected to the base of the first triode; one end of the terminal is connected to the positive electrode of the power supply, and the other end of the terminal is connected to the anode of the diode and the resistor R1; and the two ends of the resistor R1 are respectively connected to the other end of the terminal and the emitter of the first triode.

[0026] Specifically, after the two ends of the insulation equipment to be detected are clamped by alligator clips and connected to the two ends of the terminal by leads, when the insulation of the insulation equipment is normal, the resistance of the terminal is equivalent to infinity, at this time the voltage at the anode of the diode is 0, and the first triode is not conductive; when the measured insulation equipment is in a position prone to water accumulation, such as the inside of a bridge or the inside of a cable trench, the insulation will decrease after the equipment is waterlogged, thereby the resistance of the terminal decreases, at this time the voltage at the anode of the diode rises, and when the voltage exceeds the breakdown voltage of the diode and the first triode, the first triode is conductive, the alarm is triggered, and the inspector is prompted that the insulation of the measured equipment has decreased or the equipment has been waterlogged. The resistor R1 is used to avoid short circuit of the circuit.

[0027] In some embodiments, the first alarm is a buzzer.

[0028] In some embodiments, the first triode is a 9013 triode.

[0029] Specifically, the 9013 triode as a low-power amplifier, its amplification is very high, can amplify the weak input signal to sufficient amplitude to drive the latter circuit. And, 9013 triode has low noise characteristics, so that it can be used in high sensitivity circuit, to ensure the clarity and accuracy of the signal. In addition, 9013 triode has low voltage characteristics, so that it can work in low voltage environment, thereby reducing the difficulty of power management. Most importantly, 9013 triode small size, light weight, not only helps to save circuit board space, reduce the weight and cost of the whole machine, but also helps to improve the portability and maintainability of electronic equipment. In addition, 9013 triode can be connected to remote equipment, such as DCS, PLC, fire host, etc., can be observed at any time in the background equipment insulation. Those skilled in the art can use different triodes according to different actual applications, the embodiments given in the present disclosure are only exemplary.

[0030] Figure 2 is another structure diagram of the insulation detection instrument provided by the embodiment of the present disclosure. As shown in Figure 2 the insulation detection instrument further comprises a second triode and a second alarm, the base of the second triode is connected to the emitter of the first triode, the collector of the second triode is connected to the collector of the first triode, connected in the form of darlington tube, for improving the amplification of the current; the second alarm is connected in parallel across the first alarm.

[0031] Specifically, by connecting the first triode and the second triode in series, the form of darlington tube is connected, so that the current amplification of the two triodes is multiplied, thereby greatly improving the current amplification capability of the whole circuit. For example, if the amplification of the two triodes is 100, then after connecting into darlington tube, the amplification will reach 10000, effectively improving the amplification of the current.

[0032] In addition, by connecting the diode and the two triodes in series, the conduction voltage of the triode is improved, so as to ensure that the triode remains in the off state when the insulation of the measured equipment is normal, and the power supply does not need to release electric energy, or release uA level current, greatly saving the loss of electric energy.

[0033] In some embodiments, the second alarm is a light-emitting diode.

[0034] In some embodiments, the light emitting diode is connected in series with the resistor R3, and the series circuit is connected in parallel between two ends of the first alarm.

[0035] It can be understood that the light emitting diode is connected in series with the resistor R3 to limit the current through the LED, preventing the diode from being damaged due to excessive current. Furthermore, the light emitting diode is connected in parallel between two ends of the first alarm to perform audible and visual alarm when insulation degradation or equipment water ingress is detected.

[0036] In some embodiments, the second triode is a 9013 triode.

[0037] In some embodiments, the insulation detection instrument further comprises an adjustable resistor, one end of the adjustable resistor being connected with the resistor R1, and the other end being connected with the emitter of the second triode.

[0038] It can be understood that the adjustable resistor is connected in series with the resistor R1 as a comparison resistor, and adjusting the resistance value of the adjustable resistor can adjust the alarm resistance value of the detected insulated equipment. Since the triode is turned on when the insulation of the detected insulated equipment is degraded, and the voltage at the comparison resistor and the voltage at the terminal are fixed values when the breakdown voltage is reached, the resistance value ratio of the external device to be measured at the terminal and the comparison resistor is fixed due to the relationship between the voltage and the resistance, and changing the resistance value of the adjustable resistor can achieve the purpose of adjusting the alarm value of the detected insulated equipment.

[0039] In some embodiments, the insulation detection instrument further comprises a capacitor connected in parallel between two ends of the power supply to stabilize the power supply voltage.

[0040] In some embodiments, the power supply is a silver-zinc battery or a solar cell.

[0041] It can be understood that since the insulation detection instrument provided by the embodiments of the present disclosure hardly needs to consume power when the detected insulated equipment is normal, a silver-zinc battery or a solar cell is used for power supply, which can be used for a long time without replacing the battery, and therefore the insulation detection instrument can be embedded in the measured high-voltage equipment, thereby ingeniously solving the problem of difficulty in insulation detection between high and low voltages caused by power supply of the detected high-voltage equipment by a low-voltage power supply, and the battery has a small size and is easy to install, thereby increasing the flexibility of the equipment.

[0042] So far, the embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein according to the above description.

[0043] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, and are not intended to limit the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be replaced equivalently without departing from the scope and spirit of the present disclosure. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict.

[0044] It should also be noted that the terms "comprising", "containing", or any other variant thereof are intended to cover non-exclusive inclusion, so that a product or device that includes a list of elements not only includes those elements, but also includes other elements not explicitly listed, or inherent to such product or device. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the product or device comprising the element.

[0045] The acquisition, transmission, storage, use, processing, etc. of data in the technical solutions of the present application comply with the relevant provisions of national laws and regulations.

[0046] The above is only an embodiment of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the scope of claims of the present application.

Claims

1. An insulation testing instrument, used to detect whether the insulation of insulating equipment is normal, characterized in that, The insulation detection instrument comprises a terminal, a diode, a first triode, a first alarm, a power supply and a resistor R1, The first triode and the first alarm are connected in series, and the series circuit is connected in parallel across the power supply; The cathode of the diode is connected to the base of the first triode; One end of the terminal is connected to the positive pole of the power supply, and the other end is connected to the anode of the diode and the resistor R1; and The two ends of the resistor R1 are respectively connected to the other end of the terminal and the emitter of the first triode.

2. The insulation detection instrument of claim 1, wherein, The first alarm is a buzzer.

3. The insulation detection instrument of claim 1, wherein, The first triode is a 9013 triode.

4. The insulation detection instrument of claim 1, wherein, The insulation detection instrument further comprises: a second triode and a second alarm, The base of the second triode is connected to the emitter of the first triode, and the collector of the second triode is connected to the collector of the first triode, forming a Darlington tube for increasing the current amplification factor; The second alarm is connected in parallel across the first alarm.

5. The insulation detection instrument of claim 4, wherein, The second alarm is a light-emitting diode.

6. The insulation detection instrument of claim 5, wherein, The light-emitting diode is connected in series with a resistor R3, and the series circuit is connected in parallel across the first alarm.

7. The insulation detection instrument of claim 4, wherein, The second triode is a 9013 triode.

8. The insulation detection instrument of claim 4, wherein, The insulation detection instrument further comprises: an adjustable resistor, one end of which is connected to the resistor R1, and the other end is connected to the emitter of the second triode.

9. The insulation detection instrument of claim 1, wherein, The insulation detection instrument further comprises: a capacitor connected in parallel across the power supply for stabilizing the power supply voltage.

10. The insulation detection instrument of claim 1, wherein, The power supply is a silver-zinc battery or a solar cell.

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