Sleeper insulating property testing device

Abstract

In the field of national railway transportation, the electrical characteristic of a track circuit in the signal specialty begins to fluctuate greatly due to the rising of air temperature, and the lowest voltage is reduced to 230mV (technical standard: track voltage is not lower than 240mV). One-time adjustment of a track circuit cannot be achieved, and on-site investigation confirms that the insulation resistance of a sleeper of the track circuit does not reach the standard. In the sleeper ballast bed resistance testing process, a universal meter and a clamp meter are manually adopted for testing in the past, the sleeper insulation resistance value is calculated through voltage and current after testing is completed, the method has high requirements for professional skills of personnel and instrument accuracy, and if the insulation value is too low, the instrument testing data error is larger, and the testing accuracy is higher. And two instruments are needed for testing in the process, so that the problems of low efficiency and large test data error exist, the handling of hidden danger problems of equipment is influenced, and the railway driving safety is threatened. In order to solve the problems of inaccurate insulation resistance data, low efficiency and non-uniform instruments in the sleeper insulation performance testing process by manually using a universal meter and a clamp meter, the invention provides a sleeper insulation performance testing device, a YK3015 digital insulation resistance tester, also named as a megohmmeter, and a high-voltage insulation resistance tester, which simultaneously complete voltage and current numerical values, and can be used for testing the insulation performance of a sleeper. And a sleeper resistance operation result is displayed, and performance judgment (YES: insulation performance qualification and NO: insulation performance disqualification) is carried out, so that the data accuracy is practically improved.

Description

TECHNICAL FIELD

[0001] National railway transport enterprises (electricity, construction field) BACKGROUND

[0002] In the field of railway transportation, the electrical characteristics of the track circuit of the signal profession begin to fluctuate greatly due to the rise of air temperature, with the voltage decreasing from 633 mV to 290 mV, and the lowest voltage being 230 mV (technical standard: track voltage not less than 240 mV). The track circuit cannot be adjusted at one time, and the original reason is that the sleeper insulation resistance of the track circuit does not meet the standard, which leads to the failure to ensure the normal operation of the track circuit and the existence of great traffic safety hazards.

[0003] In the sleeper track bed resistance test, the testers used to use a multimeter and a clamp meter to test, and the sleeper insulation resistance value was calculated by voltage and current after the test. This method requires high professional skills of the testers and high accuracy of the instruments. If the insulation value is too low, the test data error of the instruments will be larger, and the process needs to use two instruments for testing, which has the problems of low efficiency and large test data error, thereby affecting the disposal of equipment hidden dangers and threatening the safety of railway traffic. SUMMARY

[0004] In order to solve the problems of inaccurate insulation resistance data, low efficiency and non-uniform instruments in the process of testing the insulation performance of sleepers by using a multimeter and a clamp meter by manual operation, a sleeper insulation performance testing device is invented, which can complete the voltage and current values, display the sleeper resistance calculation results, and perform performance judgment (YES: insulation performance is qualified; NO: insulation performance is unqualified), thereby improving the data accuracy. The testing device is shown in Figure 1 .

[0005] The testing method is as follows:

[0006] Before testing, the sleeper fasteners are removed, and the sleeper bolts are polished and rusted after removal to ensure good contact of the test points.

[0007] (2) In the test, 12V storage battery is converted into 220V alternating current through an inverter, and then adjusted to 30-60V alternating current through an adjustable transformer, and loaded on the bolts on both sides of the sleeper.

[0008] (3) The sleeper insulation resistance is calculated by testing voltage and current in dry conditions.

[0009] (4) The sleeper insulation resistance is calculated by testing voltage and current in wet conditions. BRIEF DESCRIPTION OF DRAWINGS

[0010] The utility model will be further explained in detail in combination with the drawings and specific embodiments:

[0011] Figure 1 The schematic diagram of the test device of the present application;

[0012] Figure 2 The appearance diagram of the test device of the present application;

[0013] Figure 3 The program diagram of the power inverter subsystem of the present application;

[0014] Figure 4 The program diagram of the insulation resistance test subsystem of the present application;

[0015] Figure 5 The program diagram of the voltage and current test subsystem of the present application;

[0016] Figure 6 The schematic diagram of the first pillow test data of the present application;

[0017] Figure 7 The schematic diagram of the second pillow test data of the present application. DETAILED DESCRIPTION

[0018] The track circuit system of a newly installed automatic block section of a railway station is ZPW-2000A, wherein the total length of a certain track section is 1099 meters, there are 11 50μF compensation capacitors in the section, and the adjustment table range is 252-681mV; the present transmission level is 3-level, and the receiving end adjustment voltage level is 86-level.

[0019] Due to the temperature rebound, the main track voltage of a certain section began to fluctuate greatly, from 633mV to 290mV, and the voltage was as low as 230mV (technical standard: track voltage is not lower than 240mV). In order to ensure the safety of train operation, the railway transportation department led the organization of the track maintenance department, design unit and construction unit to go to the scene for testing, and randomly selected three sleepers from the track bed of the section for testing, and re-anchored the anchor bolts of two of them.

[0020] (1) Test data before anchoring:

[0021] The first sleeper spike: left strand resistance 6KΩ, right strand resistance 8KΩ, sleeper insulation value: 1.888KΩ.

[0022] The second sleeper spike: left strand resistance 4KΩ, right strand resistance 5KΩ; sleeper insulation value: 0.971KΩ.

[0023] The third sleeper spike: left strand resistance 2KΩ, right strand resistance 8KΩ; sleeper insulation value: 1.308KΩ. (not re-anchored)

[0024] According to Clause 4.2.3 of the "China Railway Corporation Enterprise Standard - Concrete Sleeper Spiral Spike Anchoring" Q / CR352-2016, the insulation resistance between two spiral spikes after anchoring should not be less than 120KΩ. It was confirmed that the resistance values ​​of the spiral spikes on the newly laid track sleepers did not meet the standard. According to Clause 5.3 of the "Railway Industry Standard of the People's Republic of China - Bounce Type II Fasteners" TB / T3065-2020, when tested according to TB / T3396.5, the resistance between the two rails should not be less than 3000Ω. It was confirmed that the insulation performance of the sleepers on the newly laid track bed did not meet the standard.

[0025] Among them, the first pillow test data reference Figure 6 Second pillow test data reference Figure 7 .

[0026] (2) Test data after anchoring:

[0027] After the anchoring agent solidified for 24 hours, the three extracted sleepers were retested, and the results are as follows:

[0028] Track spike for sleeper #1: Left track resistance 34KΩ, right track resistance 50KΩ; sleeper insulation resistance: 6.327KΩ. (Sleeper insulation meets standards.)

[0029] Track spike for sleeper #2: Left track resistance 50KΩ, right track resistance 50KΩ; sleeper insulation value: 18.811KΩ. (Sleeper insulation meets standards)

[0030] The third sleeper spike has the following resistance values: left strand resistance 2KΩ, right strand resistance 5KΩ; sleeper insulation value is 1.16KΩ. (It has not been re-anchored, there is no obvious change, and it does not meet the standard.)

[0031] Data comparison showed that the insulation values ​​of the track spikes and the insulation performance of the re-anchored sleepers #1 and #2 increased significantly, while the insulation value of the track spikes on sleeper #3, which was not re-anchored, showed no significant change.

[0032] The cause was confirmed to be: poor insulation performance of the anchoring agent for the track spike bolts, resulting in substandard track bed resistance, severe track bed leakage, and serious fluctuations in track circuit voltage.

[0033] The determined rectification plan is to remove the anchors on one side of the sleepers and re-anchor them.

Claims

1. A sleeper insulation performance testing device, the YK3015 digital insulation resistance tester, also known as a megohmmeter or high-voltage insulation resistance tester, can be used in railway transportation enterprises (electrical and track maintenance fields) nationwide to test the insulation resistance of track bed sleeper anchors. It adopts STM32 chip and power inverter technology to integrate voltage and current measurement into one testing instrument, and simultaneously completes the automatic calculation and performance judgment of track bed resistance. It solves the problems of numerous testing instruments and inaccurate test data in the past. The testing instrument uses STM32 chip.

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