CN104502439A - Device for detecting defects of insulating tool for hot-line work - Google Patents

Abstract

The invention discloses a defect detection device for an insulating tool used for live work, which includes a sensor, a control module, a defect detection module for inter-layer detection and layer-along detection, and a stepping motor. The output terminal of the defect detection module is connected to the control module The input end of the sensor is connected to the input end of the control module, and the output end of the defect detection module is connected to the stepper motor. To achieve the purpose of realizing the safety detection of insulating tools with high efficiency.

Description

Defect detection device for insulating tools for live working

technical field

The invention relates to the field of electric tool detection, in particular to a defect detection device for an insulating tool for live working.

Background technique

At present, there are many types of insulating tools and safety protection equipment used in live work, and the structure is very different. Their insulation performance is directly related to the safety of workers and equipment. Therefore, the management and use of insulation tools and safety protection equipment must comply with the "State Grid Corporation of China According to the requirements of the relevant regulations in the Electric Power Safety Work Regulations (Circuit Part), strictly abide by the regulations in the safety regulations and conduct regular tests to find out the existing defects and hidden dangers in time.

Live working safety protection equipment includes insulation protection equipment, insulation masking tools and shielding equipment. Long-term use is easy to wear and accumulate dirt on the surface, resulting in thinner interlayer thickness and reduced surface resistance, which affects electrical insulation performance and threatens operation safety. Existing insulation tool detection technology is first to check the quality of the insulation, through human eyes to observe whether there are punctures and glue openings, whether there is air leakage or cracks, etc. After observation, if there are no above defects, on the premise of ensuring that the insulating tools are clean and dry, immerse the insulating tools in the insulating liquid tank for testing, and apply voltage to the insulating tools through the electrodes. According to different levels of insulating tools, the AC withstand voltage value and leakage The high voltage to be applied is selected with different current values, and the high voltage is applied for several minutes. If there is no flashover, no breakdown, and no obvious heating, the test is passed, otherwise it cannot be passed. All the above tests need to be carried out in insulating fluid. After the test, the insulating tool is stained with insulating fluid and cannot be used for live work immediately. Another method is to use a shaking meter to measure the resistance on site, which requires two workers to work together. This method cannot fully detect the insulating tools, and the detection efficiency is low.

Contents of the invention

The purpose of the present invention is to solve the above problems and propose a defect detection device for insulated tools for live working, so as to realize the advantages of high efficiency and safety detection of insulated tools.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A defect detection device for insulating tools for live work, including a sensor, a control module, a defect detection module for interlayer detection and layer-along detection, and a stepping motor, the output end of the defect detection module is connected to the input end of the control module , the output end of the sensor is connected to the input end of the control module, and the output end of the defect detection module is connected to the stepper motor.

Preferably, the defect detection module includes a TL494 chip, a transistor P1, a field effect transistor Q1, a diode D4 and a diode D5, and a resistor R13 and a resistor R12 are connected in series between the IN+ input terminal of the TL494 chip and ground, and the resistor On the node between R13 and resistor R12, a resistor R11 is connected in series, a resistor R16 is connected in series between the VREF reference output terminal of the TL494 chip and the IN- input terminal of the TL494 chip, a resistor R15 is connected in series on the CMPEN input terminal of the TL494 chip, and a resistor R14 is connected in series. The series circuit composed of the capacitor C13 is connected in parallel with the resistor R15, the C1 input terminal of the TL494 chip is connected to the collector of the triode P1, the E2 output terminal of the TL494 chip is connected to the anode of the diode D5, and the anode of the diode D5 It is connected with the base of the triode P1, the cathode of the diode D5 is connected with the emitter of the triode P1, the cathode of the diode D5 is connected in series with the grid of the field effect transistor Q1, the resistor R17 is connected in series, the source of the field effect transistor Q1 and A Zener diode is connected in series between the drains of the field effect transistor Q1, the anode of the Zener diode is connected to the source of the Field effect transistor Q1, the drain of the Field effect transistor Q1 is connected in series with the anode of the diode D4, and the diode D4 The cathode of the resistor R20 is connected in series, and the two ends of the resistor R20 are connected in parallel with a resistor C7.

Preferably, the resistance of the resistor R11 is 500MΩ, the resistance of the resistor R12 is 1MΩ, and the capacitance of the capacitor C7 is 10uF.

Preferably, the stepper motor is divided into a horizontal stepper motor and a vertical stepper motor, if the defect detection module detects a defect, the control module sends a marking control signal to the stepper motor, and the horizontal stepper motor drives the track back to the The defect point, the vertical stepping motor drives the water core pen to move to the defect point to complete the positioning, the horizontal stepping motor starts again, and the defect point positioned by the vertical stepping motor is used as the center to move left and right to mark.

The technical solution of the present invention has the following beneficial effects:

In the technical solution of the present invention, the pulse signal sent by the defect detection module can detect the insulating layer of the insulating tool, which can be realized by a single person, and achieves the purpose of realizing the safety detection of the insulating tool with high efficiency.

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is a functional block diagram of an insulating tool defect detection device for live working according to an embodiment of the present invention;

Fig. 2 is an electronic circuit diagram of the defect detection module according to the embodiment of the present invention.

Detailed ways

The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

As shown in Figure 1, a defect detection device for insulating tools for live work, including sensors, control modules, defect detection modules and stepping motors for inter-layer detection and layer-along detection, the output terminal of the defect detection module and the control module The input end of the sensor is connected to the input end of the control module, and the output end of the defect detection module is connected to the stepper motor.

As shown in Figure 2, the defect detection module includes TL494 chip, triode P1, field effect transistor Q1, diode D4 and diode D5, the series resistor R13 and resistor R12 between the IN+ input terminal of the TL494 chip and the ground, the resistor R13 and the resistor A resistor R11 is connected in series at the node between R12, a resistor R16 is connected in series between the VREF reference output terminal of the TL494 chip and the IN- input terminal of the TL494 chip, a resistor R15 is connected in series at the CMPEN input terminal of the TL494 chip, a series circuit composed of a resistor R14 and a capacitor C13 In parallel with resistor R15, the C1 input terminal of the TL494 chip is connected to the collector of the triode P1, the E2 output terminal of the TL494 chip is connected to the anode of the diode D5, and the anode of the diode D5 is connected to the base of the triode P1, the diode D5 The cathode of the diode is connected to the emitter of the triode P1, the resistor R17 is connected in series between the cathode of the diode D5 and the grid of the field effect transistor Q1, and the voltage regulator diode is connected in series between the source of the field effect transistor Q1 and the drain of the field effect transistor Q1, and the voltage is stabilized The anode of the diode is connected to the source of the field effect transistor Q1, the drain of the field effect transistor Q1 is connected in series with the anode of the diode D4, the cathode of the diode D4 is connected in series with a resistor R20, and both ends of the resistor R20 are connected in parallel with a resistor C7.

The resistance value of the resistor R11 is 500MΩ, the resistance value of the resistor R12 is 1MΩ, and the capacitive reactance of the capacitor C7 is 10uF.

Stepper motors are divided into horizontal stepper motors and vertical stepper motors. If the defect detection module detects a defect, the control module sends a mark control signal to the stepper motor, and the horizontal stepper motor drives the crawler back to the defect point. The stepping motor drives the water core pen to move to the defect point to complete the positioning, and the horizontal stepping motor is started again, and the defect point positioned by the vertical stepping motor is used as the center to move left and right for marking.

The node labeled 12v in Figure 2 is connected to the control module through a relay, and when the control module issues an interlayer detection command, the relay pulls in the 12v power output. The pins IN+ and IN- of the TL494 chip are the positive and negative input terminals of the error amplifier; the pin CMPEN is the comparator input terminal of the TL494 chip; the pin DTC is the dead time control terminal; the pins RT and CT are Oscillator input terminal; pins C1, C2 and VCC are power input; pin CNTLO is output control terminal; pin E1 and E2 are output terminal; pin VREF is reference voltage output terminal; pin IN2- and IN2+ are error The positive input and negative input of the amplifier. The pins of the TL494 chip are commonly used functions by those skilled in the art, and the meanings of the pins in English are clear and definite.

In Figure 2, the resistor R11 and the resistor R12 are connected in series to divide the voltage and act as the input resistor of the amplifier. The diode D5 is used as a protection diode to prevent the output high-voltage inverter from affecting the TL494. The triode P1 is used for current amplification. The capacitor C7 and the resistor R20 are connected in parallel and then connected in series with the diode D4. To prevent the boost module from affecting the low voltage module. The TL494 chip is a fixed-frequency pulse width modulation circuit with a built-in linear sawtooth oscillator. The oscillation frequency can be adjusted through a resistor and a capacitor connected to RT and CT. The oscillation frequency is as follows:

                                                

The width of the output pulse is realized by comparing the positive polarity sawtooth voltage on the capacitor C4 with the other two control signals. The 1:10 boost module is connected through the J3 terminal in the figure. If a defect is detected, the inter-layer detection defect signal and the layer-along detection defect signal are sent to the control module, and the control module sends the stepping motor control signal and the marking control signal to the stepping motor. The defect marking is realized by the stepping motor, track and water core pen. If a defect is detected, the control module sends a marking control signal to the stepping motor. The stepping motor in the horizontal direction drives the track to return to the defect point, and the stepping motor in the vertical direction drives the water core. The pen moves downward to further locate the defect point, and the horizontal stepping motor starts again to move left and right with the defect point as the center for marking.

The magnification factor of the step-up module for interlayer defect detection is 1:20. The stepper motor drive mainly consists of three directions: x, y, and z.

The working process of the defect detection device for insulating tools for live working is as follows:

1. Device initialization,

Due to a power failure or the termination of the previous detection process, the photoelectric sensor did not stop at the initial position, and the photoelectric sensor needs to be initialized to the initial point before a new detection begins.

2. Dimension detection of insulating tools,

Different insulating tools have different sizes and thicknesses, so it is necessary to judge the size and thickness of insulating tools through horizontal and vertical sensors, thereby limiting the horizontal detection width and longitudinal compression thickness. Horizontal and vertical sensors are photoelectric sensors.

3. Detection,

It adopts linkage in three directions of x, y, and z, and cooperates with horizontal scanning mode high-voltage output to realize defect detection of insulating tools.

4. Defect marking,

When a defect is detected, the control module sends a stop detection command, returns to the defect location and marks the defect type.

Insulated tool defect detection device for live work, the initialization signal comes from the limit sensor, when the limit sensor outputs a high level, it means that the detection sensor is not in the initial position, the control module sends a homing command to the stepping motor, and the stepping motor drives the sensor Moving towards the initial position, when the detection sensor reaches the initial position, the limit sensor generates a low level input to the control module, thereby completing the device initialization. Step 2. Taking one side of the insulating tool as a reference point, the detection sensor moves from left to right. When no obstruction is detected, it is the other boundary of the insulating tool. Record the number of rotations of the stepping motor to calculate the running path and the width of the insulating tool. The stepping motor in the vertical direction drives the sensor in the vertical direction to move downward, and the pressure sensor determines the thickness of the insulating tool according to the force on the bottom surface of the insulating tool, and records the limit value in the vertical direction. Step 3. By applying high voltage between layers and along the surface, and with the cooperation of sensors in the three directions of x, y, and z, scan from left to right and from top to bottom to detect interlayer and surface defects of insulating tools. Step 4. When a defect is detected, the control module sends a stop detection command, and sends a return command to the previous point, and marks it (red mark for interlayer defects, blue mark for surface defects).

The interlayer detection of the technical solution of the present invention can be done by arranging special electrodes along the surface and between layers, and applying voltage on the two electrodes for several minutes to observe whether there is flashover, breakdown, or obvious heating. And a mobile detection method is adopted (that is, the electrode is detected horizontally, and the insulating tool moves upwards evenly to realize a comprehensive detection). The control module is used to control the entire detection process. After the power is turned on, the sensor detects the size of the insulating tool for positioning, and then applies high voltage between layers and along the surface and uses the mobile detection method to detect the defect. After detecting the defect, it automatically marks the defect type and continues the detection.

In summary, the technical solution of the present invention has the following effects:

1. For the detection of interlayer defects of insulating tools for live work, the interlayer detection should be separated from the insulating liquid, and has the same effect as the detection in the insulating liquid.

2. The surface defect detection of insulating tools used for live work should fully cover the insulating tools and be completed efficiently.

3. The detection process is one-button operation, efficient and reliable.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (4)

1. a hot line job insulating tool defect detecting device, it is characterized in that, comprise sensor, control module, for interlayer detect and along layer detect defects detection module and stepper motor, the described output terminal of defects detection module is connected with the input end of control module, the output terminal of described sensor is connected with the input end of control module, and the output terminal of described defects detection module connects stepper motor.

2. hot line job insulating tool defect detecting device according to claim 1, it is characterized in that, described defects detection module, comprise TL494 chip, triode P1, field effect transistor Q1, diode D4 and diode D5, resistance in series R13 and resistance R12 between the IN+ input end of described TL494 chip and ground, resistance in series R11 on node between described resistance R13 and resistance R12, resistance in series R16 between the VREF reference output of described TL494 chip and the IN-input end of TL494 chip, resistance in series R15 on the CMPEN input end of described TL494 chip, the series circuit that resistance R14 and electric capacity C13 forms is in parallel with resistance R15, the C1 input end of described TL494 chip is connected with the collector of triode P1, the E2 output terminal of described TL494 chip is connected with the anode of diode D5, and the anode of diode D5 is connected with the base stage of triode P1, the negative electrode of this diode D5 is connected with the emitter of triode P1, resistance in series R17 between the negative electrode of described diode D5 and the grid of field effect transistor Q1, series voltage stabilizing diode between the source electrode of described field effect transistor Q1 and the drain electrode of field effect transistor Q1, the anode of described voltage stabilizing diode is connected with the source electrode of field effect transistor Q1, the drain electrode of described field effect transistor Q1 is connected with the anode of diode D4, this diode D4 negative electrode resistance in series R20, the two ends parallel resistance C7 of this resistance R20.

3. hot line job insulating tool defect detecting device according to claim 1 and 2, is characterized in that, the resistance of described resistance R11 is 500M Ω, and the resistance of described resistance R12 is 1M Ω, and the capacitive reactance of described electric capacity C7 is 10uF.

4. hot line job insulating tool defect detecting device according to claim 3, it is characterized in that, described stepper motor is divided into horizontal direction stepper motor and vertical direction stepper motor, if defects detection module detects defect, control module sends marking of control signal to stepper motor, horizontal direction stepper motor drives crawler belt to be back to defect point, vertical direction stepper motor drives water core pen to move to defect point and completes location, and horizontal step motor again starts side-to-side movement centered by the defect point of vertical direction stepper motor location and marks.