Insulator string resistance testing device

Abstract

The utility model provides an insulator string resistance testing device, which comprises a control mainboard, a display, a high-voltage module and an ampere meter, the output end of the high-voltage module is electrically connected with one end of an insulator to be tested through a first test line, the other end of the insulator to be tested is connected with a ground wire through a second test line, the ground wire is grounded, and the ampere meter is electrically connected with the control mainboard. The ampere meter is mounted on a ground wire; the control mainboard is respectively connected with the display, the high-voltage module and the ampere meter, the control mainboard is used for supplying power to the high-voltage module, collecting current data detected by the ampere meter and transmitting the current data to the display, and the high-voltage module is used for outputting high-voltage direct current. According to the utility model, the high-voltage module is matched with the ammeter to test the insulator, current data passing through the insulator can be obtained, and the accurate resistance value of the insulator can be calculated according to the relation between the current and the resistance, so that the damage degree of the insulator can be accurately judged according to the resistance value of the insulator and the model of the insulator.

Description

TECHNICAL FIELD

[0001] The utility model relates to insulator test technical field especially relates to a kind of insulator string resistance testing device. BACKGROUND

[0002] Insulator is one of the equipment widely used in power system, and its advantages and disadvantages are directly related to the safe and stable operation of power system, and once damaged, it will cause flashover trip accident. Therefore, it is necessary to detect the inferior insulator in the insulator. Insulation resistance is an important parameter to represent the advantages and disadvantages of insulator, and good insulation resistance is an important prerequisite for normal operation.

[0003] The current detection method of insulator mainly includes infrared temperature measurement method, distribution voltage method, ultraviolet imaging method, etc. The infrared temperature measurement method detects the surface temperature anomaly of insulator to judge the insulation performance of insulator, and its disadvantage is that the detection result is greatly affected by environmental temperature, and the error is large. The distribution voltage method locates zero value point by measuring voltage distribution anomaly of insulator string, and its disadvantage is that the detection result is easy to be disturbed by electromagnetic interference, and the safety risk is relatively high. The ultraviolet imaging method uses ultraviolet rays generated by corona discharge and surface discharge, and converts invisible ultraviolet light into visible light by special equipment, so as to judge the insulation performance of insulator, and its disadvantage is that it needs to be tested in dark environment, and the degradation degree of insulator cannot be quantified.

[0004] The above detection methods are qualitative measurement, and the resistance value of insulator cannot be accurately measured, so the damage degree of insulator cannot be accurately judged. INVENTION CONTENTS

[0005] The utility model provides a kind of insulator string resistance testing device, solve the problem that the performance detection method of insulator in prior art cannot accurately measure the resistance value of insulator, so as to accurately judge the damage degree of insulator and other problems.

[0006] The technical scheme of the utility model is as follows:

[0007] The utility model provides a kind of insulator string resistance testing device, including control mainboard, display, high voltage module and ammeter, the output of high voltage module is electrically connected with one end of the insulator to be measured by first test line, the other end of the insulator to be measured is connected with ground wire by second test line, the ground wire is grounded, and the ammeter is installed on the ground wire;The control mainboard is connected with display, high voltage module and ammeter respectively, the control mainboard is used to power supply for high voltage module, and the current data detected by ammeter is transmitted to display, and the high voltage module is used to output high voltage direct current.

[0008] The utility model discloses a high -voltage module cooperation ammeter tests insulator, can obtain the current data of insulator, and according to the relationship of current and resistance can calculate the accurate resistance of insulator, thereby can judge the damage degree of insulator according to the resistance of insulator and its model accurately. And because the insulator has certain parasitic capacitance, if the resistance of insulator is measured by alternating current or pulse current, there will be certain error, and the utility model discloses that the problem can be avoided by high -voltage module output direct current and tests insulator.

[0009] Preferably, the high-voltage module is provided with a plurality of high-voltage modules, the number of high-voltage modules is half the number of insulators on the insulator string, each high-voltage module provides a test voltage for two adjacent insulators; the second test line is alternately connected to the end of the adjacent insulator with the first test line; a plurality of relay modules are installed on the control mainboard, and the control mainboard controls the on-off of the plurality of high-voltage modules through the plurality of relay modules; a switch is provided on each second test line, and the switch is electrically connected to the control mainboard; the on-off state of the plurality of relay modules and the switch is controlled by the control mainboard to select any one insulator on the insulator string for testing; by designing a plurality of high-voltage modules and a plurality of test lines, any insulator at any position on the insulator string can be selected for testing by the control mainboard, without the need for repeated re-wiring, which is convenient to operate and improves the testing efficiency of the insulator string.

[0010] Specifically, the high-voltage module comprises an inverter, a booster and a rectifier connected in sequence, the inverter is used to convert the low-voltage direct current output by the control mainboard into low-voltage alternating current, the booster is used to convert the low-voltage alternating current into high-voltage alternating current, and the rectifier is used to convert the high-voltage alternating current into high-voltage direct current output.

[0011] Specifically, a DC-DC circuit is installed on the control mainboard for outputting low-voltage direct current to the high-voltage module.

[0012] Preferably, a current comparator and an alarm are installed on the control mainboard, the current comparator compares the collected current with the reference current, and when the collected current is greater than the reference current, the alarm is controlled to alarm; by integrating the current comparator and the alarm on the control mainboard, an alarm can be given when a fault (resistance value below the safety threshold) occurs in a certain insulator. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0014] Figure 1 It is the circuit principle diagram of the insulator string resistance testing device of the utility model;

[0015] Figure 2 It is the connection structure schematic diagram of the control mainboard and each electric appliance element in the utility model embodiment;

[0016] In the drawing: 1, control mainboard;2, display;3, high voltage module;4, ammeter;5, first test line;6, insulator;7, second test line;8, ground wire;9, multiway relay module;10, switch;11, DC-DC circuit;12, current comparator;13, alarm. DETAILED DESCRIPTION

[0017] The technical scheme of the utility model will be described clearly and completely in combination with the utility model embodiments below, and obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0018] Reference Figure 1 、 2 The utility model provides a kind of insulator string resistance testing device, including control mainboard 1, display 2, high voltage module 3 and ammeter 4, the output of high voltage module 3 is electrically connected with one end of the insulator to be measured 6 by first test line 5, another end of the insulator to be measured 6 is connected with ground wire 8 by second test line 7, ground wire 8 is grounded, and ammeter 4 is installed on ground wire 8;Control mainboard 1 is connected with display 2, high voltage module 3 and ammeter 4 respectively, and control mainboard 1 is used to power supply high voltage module 3, and current data detected by ammeter 4 is transmitted to display 2, and high voltage module 3 is used to output high voltage direct current.

[0019] The utility model can obtain current data through insulator 6 by high voltage module 3 cooperation ammeter 4 to test insulator 6, and the accurate resistance value of insulator 6 can be calculated according to the relationship between current and resistance, so that the damage degree of insulator 6 can be accurately judged according to the resistance value and model of insulator 6. And since there is certain parasitic capacitance in insulator 6, if alternating current or pulse current is used to measure the resistance of insulator 6, there will be certain error, and the utility model can avoid this problem by outputting direct current to test insulator 6 by high voltage module 3.

[0020] Preferably, as Figure 1As shown, the high-voltage module 3 is provided with a plurality of high-voltage modules 3, the number of high-voltage modules 3 is half the number of insulators 6 on the insulator string, each high-voltage module 3 provides a test voltage for two adjacent insulators 6; the second test line 7 is alternately connected to the end of the adjacent insulator 6 with the first test line 5; the control mainboard 1 is provided with a plurality of relay modules 9, the control mainboard 1 controls the on-off of the plurality of high-voltage modules 3 through the plurality of relay modules 9, each second test line 7 is provided with a switch 10, the number of first test lines 5 is the same as the number of high-voltage modules 3, and the number of second test lines 7 is one more than the number of first test lines 5; the switch 10 is electrically connected to the control mainboard 1, and the on-off state of the plurality of relay modules 9 and the switch 10 is controlled by the control mainboard 1 to select any one insulator 6 on the insulator string for testing; by designing a plurality of high-voltage modules 3 and a plurality of test lines, any insulator 6 at any position on the insulator string can be selected for testing by the control mainboard 1, without the need for repeated re-wiring, convenient operation, and improved testing efficiency of the insulator string.

[0021] As shown in the embodiment, Figure 1 、 2 There are 10 insulators 6 in series on the insulator string, 5 high-voltage modules 3, 5 first test lines 5, 6 second test lines 7, 5 relay modules and 6 switches 10 need to be set; the circuit structure is as shown in Figure 1 .

[0022] Specifically, the high-voltage module 3 includes an inverter, a booster and a rectifier connected in sequence, the inverter is used to convert the low-voltage direct current output by the control mainboard 1 into low-voltage alternating current, the booster is used to convert the low-voltage alternating current into high-voltage alternating current, and the rectifier is used to convert the high-voltage alternating current into high-voltage direct current output, in the embodiment, the output of the high-voltage module 3 is 60KV high-voltage direct current, and the specific output voltage value can be flexibly adjusted according to the actual situation, the positive electrode of the output end of the high-voltage module 3 is connected with the steel cap or steel foot of the insulator 6, and the other end is grounded.

[0023] Specifically, as shown in Figure 2 The control mainboard 1 is provided with a DC-DC circuit 11 for outputting low-voltage direct current to the high-voltage module 3; in the embodiment, the input of the control mainboard 1 is DC12V, and the output is DC1.25-35V.

[0024] Preferably, as shown in Figure 2As shown, the control mainboard 1 is provided with a current comparator 12 and an alarm 13, the current comparator 12 compares the collected current with a reference current, and when the collected current is greater than the reference current, the alarm 13 is controlled to alarm; by integrating the current comparator 12 and the alarm 13 on the control mainboard 1, when a certain insulator 6 is found to be faulty (the resistance value is lower than the safety threshold), the alarm can be prompted.

[0025] In this embodiment, the method for calculating the resistance value of the insulator according to the collected current value is as follows:

[0026] Before testing, a resistor with a known resistance value in the laboratory is connected to the circuit instead of the insulator, after the high-voltage module 3 is turned on, the value of the ammeter 4 is collected, a plurality of groups of current-resistance data are collected through multiple experiments, and the mapping relationship (fitting function) between the current and the resistance is obtained through data fitting; in actual testing, according to the mapping relationship between the current and the resistance, the resistance value of the insulator can be calculated according to the collected current data.

[0027] The working principle of the testing device in this embodiment is as follows:

[0028] First, according to Figure 1 As shown, 11 test lines are connected to the insulator string to be tested, and any one insulator 6 can be selected for testing according to requirements, for example, the third insulator 6 from left to right is selected for testing, then the switch 10 on the second test line 7 on the left side of the third insulator 6 needs to be closed by the control mainboard 1, and the relay corresponding to the high-voltage module 3 on the right side of the third insulator 6 needs to be turned on, high-voltage direct current is output by the high-voltage module 3, the high-voltage direct current flows into the ground wire 8 from the second test line 7 on the left side of the third insulator 6 after passing through the third insulator 6, and then flows into the ground after passing through the ammeter 4, the current data of the ammeter 4 is collected by the control mainboard 1, the collected current value is displayed through the display 2, and then the resistance value is calculated according to the corresponding relationship between the current value and the resistance value. In the specific implementation process, each insulator 6 on the insulator string can also be tested in sequence from left to right.

[0029] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An insulator string resistance testing device, characterized by, The utility model relates to an insulator testing device, including control mainboard (1), display (2), high voltage module (3) and ammeter (4), the output of high voltage module (3) is connected with the one end of the insulator (6) to be measured through first test line (5), the other end of the insulator (6) to be measured is connected with ground wire (8) through second test line (7), ground wire (8) is grounded, and ammeter (4) is installed on ground wire (8), control mainboard (1) is connected with display (2), high voltage module (3) and ammeter (4) respectively, control mainboard (1) is used to power supply for high voltage module (3), and the current data transmission of the current data detected by ammeter (4) is given to display (2), and high voltage module (3) is used to output high voltage direct current.

2. A device for testing the resistance of a string of insulators as claimed in claim 1, wherein, The high voltage module (3) is provided with multiple, the number of high voltage module (3) is half of the number of insulator (6) on insulator string, and each high voltage module (3) provides test voltage for two adjacent insulators (6) respectively, second test line (7) and first test line (5) are alternately connected in the end of adjacent insulator (6), and multiple relay module (9) is installed on control mainboard (1), control mainboard (1) controls the on-off electricity of multiple high voltage modules (3) through multiple relay module (9), and switch (10) is arranged on each second test line (7), and switch (10) is electrically connected with control mainboard (1), and the on-off state of multiple relay module (9) and switch (10) is controlled by control mainboard (1), and any one insulator (6) on insulator string is selected to carry out testing.

3. A device for testing the resistance of a string of insulators as claimed in claim 1, wherein, The high voltage module (3) includes inverter, booster and rectifier connected in sequence, the inverter is used to convert low voltage direct current output by control mainboard (1) into low voltage alternating current, the booster is used to convert low voltage alternating current into high voltage alternating current, and the rectifier is used to convert high voltage alternating current into high voltage direct current output.

4. A device for testing the resistance of a string of insulators as claimed in claim 1, wherein, DC-DC circuit (11) is installed on control mainboard (1) and is used to output low voltage direct current to high voltage module (3).

5. A device for testing the resistance of a string of insulators as defined in claim 1, wherein Current comparator (12) and alarm (13) are installed on control mainboard (1), current comparator (12) compares the current collected with reference current, and when the current collected is greater than reference current, alarm (13) is controlled to alarm.

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