CN112881586A - Performance evaluation detection method and system for cable flame-retardant wrapping tape after operation - Google Patents
Performance evaluation detection method and system for cable flame-retardant wrapping tape after operation Download PDFInfo
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Abstract
A performance evaluation detection method and a system for a cable flame-retardant wrapping tape after operation comprise the following steps: step 1, collecting a cable flame-retardant wrapping tape sample on a cable which is wrapped with a cable flame-retardant wrapping tape and runs, marking as a running group, preparing a group of cable flame-retardant wrapping tape samples by using the same cable flame-retardant wrapping tape sample which is not wrapped, and marking as a control group; step 2, placing the cable in a state adjusting chamber for state adjustment, drying the cable flame-retardant wrapping tape sample, and cooling to room temperature; step 3, performing a 50W blast lamp vertical combustion test on the running group cable flame-retardant wrapping tape test sample and the control group cable flame-retardant wrapping tape test sample; step 4, measuring the carbonization height of each group of cable flame-retardant wrapping tape samples to obtain the carbonization height ratio of the operating group cable flame-retardant wrapping tape samples to the control group cable flame-retardant wrapping tape samples; and 5, comparing the carbonization height ratio with the failure criterion of the cable flame-retardant wrapping tape, and judging whether the cable flame-retardant wrapping tape fails at the sampling moment.
Description
Technical Field
The invention belongs to the technical field of cable fire prevention, and particularly relates to a method and a system for evaluating and detecting performance of a flame-retardant wrapping tape of a cable after operation.
Background
The flame-retardant wrapping tape is wound on the surface of the cable, the working requirement is that the self-adhesive flame-retardant wrapping tape is uniformly wound according to the specification of half of the overlapping, and the cable has the characteristics of flame retardance, operability and the like.
For example, prior art document 1 (flying cable electrical material limited, promizhou. "an antioxidant nano flame-retardant wrapping tape and a manufacturing method thereof" # cn109961893 a.2019-07-02.) discloses an antioxidant nano flame-retardant wrapping tape and a manufacturing method thereof, wherein glass fiber woven cloth and nano composite fiber woven cloth are used as base cloth, nano flame-retardant colloid is used as flame-retardant liquid, and the nano flame-retardant colloid consists of the following components in percentage by mass: 36% -49% of nano toughened ceramic powder; 0.5 to 1 percent of high-temperature resistant halogen-free curing agent; formaldehyde crosslinking agent 0.5%; 1% -2% of MF formaldehyde condensate dispersant; 4 to 5 percent of antimony flame retardant; 5% -10% of nano silica gel; 40 to 45 percent of ethyl acetate.
However, the prior art fire-retardant wrapping tape cannot evaluate whether the fire-retardant ability is ineffective after long-term operation. The main problems are focused on: 1) the criterion for evaluating whether the fire-retardant wrapping tape fails after long-term operation is lacked; 2) the test parameter setting basis for simulating aging is lacked; 3) the basis for evaluating whether the fire-retardant bag belt to be adopted can meet the fire-retardant requirement after operation by carrying out aging simulation on the fire-retardant bag belt before commissioning is lacked; 4) the put-in-service line is not easy to take a large amount of samples because the wrapping tape is wrapped for a long time, and the method before the put-in-service in the prior art is not suitable for evaluation and detection after the put-in-service.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a method and a system for evaluating and detecting the performance of a flame-retardant wrapping tape of a cable after operation.
The invention adopts the following technical scheme. The invention provides a method for evaluating and detecting the performance of a flame-retardant wrapping tape of a cable after operation, which comprises the following steps:
step 1, preparing a plurality of groups of strip-shaped cable flame-retardant wrapping tape samples, wherein each group of samples comprises a plurality of cable flame-retardant wrapping tape samples; one group of cable flame-retardant wrapping tape samples are an unaged group, and the other groups of cable flame-retardant wrapping tape samples are aging simulation groups;
step 2, carrying out an aging simulation test on all the aging simulation group cable flame-retardant wrapping tape samples, and taking out a group of cable flame-retardant wrapping tape samples from the aging simulation test according to a set time node;
step 3, placing the cable flame-retardant wrapping tape sample in a state adjusting chamber for state adjustment, then drying the cable flame-retardant wrapping tape sample, and cooling to room temperature;
step 4, carrying out a 50W blast lamp vertical burning test on the unaged group cable flame-retardant wrapping tape sample and the aging simulation group cable flame-retardant wrapping tape sample taken out from the aging simulation test in sequence;
step 5, measuring the carbonization height of each group of cable flame-retardant wrapping tape samples to obtain the ratio of the carbonization height of each group of cable flame-retardant wrapping tape samples of the aging simulation group to the carbonization height of the cable flame-retardant wrapping tape samples of the unaged group;
and 6, arranging the carbonization height ratios of the groups of the cable flame-retardant wrapping tape samples according to the sequence of the non-aging simulation time and the aging simulation time to obtain a group of flame-retardant wrapping tape samples with the ratio increasing trend inflection points, wherein the corresponding ratio is a cable flame-retardant wrapping tape failure criterion reference value, and the corresponding aging simulation time is a cable flame-retardant wrapping tape simulated failure time reference value.
The invention provides a method for evaluating and detecting the performance of a flame-retardant wrapping tape of a cable after operation, which comprises the following steps:
step 1, preparing a plurality of groups of strip-shaped cable flame-retardant wrapping tape samples by using the cable flame-retardant wrapping tape samples which are not wrapped, wherein each group of cable flame-retardant wrapping tape samples comprises a plurality of cable flame-retardant wrapping tape samples, one group of cable flame-retardant wrapping tape samples is an unaged group, and the rest groups are aging simulation groups;
step 2, carrying out aging simulation tests on each aging simulation group, and taking out a group of cable flame-retardant wrapping tape samples from the aging simulation tests in sequence according to set time nodes, wherein the time for taking out the last group of samples is not shorter than the simulation failure time;
step 3, placing the cable flame-retardant wrapping tape sample in a state adjusting chamber for state adjustment, then drying the cable flame-retardant wrapping tape sample, and cooling to room temperature;
step 4, carrying out a 50W blast lamp vertical burning test on the unaged group cable flame-retardant wrapping tape sample and the aging simulation group cable flame-retardant wrapping tape sample taken out from the aging simulation test in sequence;
step 5, measuring the carbonization height of each group of cable flame-retardant wrapping tape samples to obtain the ratio of the carbonization height of each group of cable flame-retardant wrapping tape samples of the aging simulation group to the carbonization height of the cable flame-retardant wrapping tape samples of the unaged group;
and 6, arranging the carbonization height ratio of the cable flame-retardant wrapping tape samples of each group according to the sequence of the aging simulation time and the aging simulation time, and comparing the carbonization height ratio with the failure criterion of the cable flame-retardant wrapping tape to judge whether the cable flame-retardant wrapping tape fails before and after the simulation failure time.
Preferably, the simulated failure time in step 2 and the criterion for the fire-retardant tape failure of the cable in step 5 are set according to the reference value of the criterion for the fire-retardant tape failure of the cable and the reference value of the simulated failure time obtained by the evaluation and detection method in claim 1.
Preferably, step 2 comprises: and (3) carrying out a humidification simulation test, putting the prepared samples into a constant temperature and humidity box, respectively taking out one group after the first set time, the second set time and the third set time for carrying out the subsequent steps, and putting the samples into a constant temperature and humidity chamber for balancing after the samples are taken out.
Preferably, in the humidification simulation test, the constant temperature and humidity chamber is set to have the humidity RH47 +/-2 and the temperature 95 +/-3 ℃.
Preferably, step 2 comprises: and (3) carrying out a saline aging resistance test, completely immersing the prepared samples into a glass instrument of saline solution with set concentration, respectively taking out a group of samples for testing after the first set time, the second set time and the third set time, and putting the samples into a constant temperature and humidity chamber for balancing after the samples are taken out.
Preferably, in the brine aging resistance test, the salt solution with a set concentration is a 3% sodium chloride solution.
Preferably, the first set period of time is 7 days, the second set period of time is 10 days and the third set period of time is 15 days.
The third aspect of the invention provides a method for evaluating and detecting the performance of a flame-retardant wrapping tape of a cable after operation, which comprises the following steps:
step 1, collecting cable flame-retardant wrapping tape samples on cables which are wrapped with cable flame-retardant wrapping tapes and run, marking as a running group, preparing a group of cable flame-retardant wrapping tape samples by using the same type of cable flame-retardant wrapping tape samples which are not wrapped, and marking as a control group, wherein each group of samples comprises a plurality of cable flame-retardant wrapping tape samples;
step 2, placing the cable flame-retardant wrapping tape sample collected in the step 1 in a state adjusting chamber for state adjustment, then drying the cable flame-retardant wrapping tape sample, and cooling to room temperature;
step 3, performing a 50W blast lamp vertical combustion test on the running group cable flame-retardant wrapping tape test sample and the control group cable flame-retardant wrapping tape test sample;
step 4, measuring the carbonization height of each group of cable flame-retardant wrapping tape samples to obtain the ratio of the carbonization height of the operating group of cable flame-retardant wrapping tape samples to the carbonization height of the control group of cable flame-retardant wrapping tape samples;
and 5, comparing the carbonization height ratio with the failure criterion of the flame-retardant cable wrapping tape to obtain a performance evaluation detection result after the flame-retardant cable wrapping tape operates at the sampling time.
Preferably, a cable fire-retardant tape failure criterion is set according to the cable fire-retardant tape failure criterion reference value obtained in claim 1;
if the combustion grade is V-0 and the carbonization height ratio does not exceed a first set value, the evaluation conclusion is to continue the operation;
if the combustion grade V-1 or the carbonization height ratio is greater than a first set value and does not exceed a second set value, evaluating the conclusion as attention, and setting time tracking detection at intervals;
and if the combustion grade V-2 is not met, or the vertical combustion grade is not met, or the carbonization height ratio exceeds a second set value, the evaluation conclusion is failure, and the operation is quit.
Preferably, each group of the cable flame-retardant wrapping tape test strips is at least five, and the carbonization height of each group of the cable flame-retardant wrapping tape test strips is calculated by the average value of the carbonization heights of all the test samples of each group of the cable flame-retardant wrapping tape test strips.
Preferably, the test sample of the cable flame-retardant wrapping tape is placed in a condition adjusting chamber for condition adjustment, namely the test sample is subjected to condition adjustment for at least 48 hours at 23 +/-2 ℃ and 50% +/-5% relative humidity, and is taken out from a condition adjusting test box and then is tested within 1 hour.
Preferably, in step 1, the collected strip-shaped test sample with the flame-retardant tape has the length of 125mm +/-5 mm, the width of 13.0 mm +/-0.5 mm and smooth edges.
Preferably, the fire-retardant wrapping tape collected in step 1 comprises: the plastic flame-retardant bag belt comprises a plastic flame-retardant bag belt and a rubber flame-retardant bag belt, wherein a plastic film is removed in a test before the self-adhesive rubber flame-retardant bag belt is used.
Preferably, the first set value is 1.3, the second set value is 1.5, and the set interval time is half a year.
The fourth aspect of the invention provides a performance evaluation detection system using the method for evaluating and detecting the performance of the flame-retardant cable wrapping tape after operation, which comprises the following steps:
the constant temperature and humidity box is used for a damp and hot aging simulation test;
the glass container is used for a brine aging resistance simulation test;
the device comprises a 50W flame combustion test device, a state adjusting chamber, a ruler and a cotton wool pad, and is used for a combustion test.
Compared with the prior art, the method has the beneficial effects that 1) the method provides a failure criterion reference value after the operation of the flame-retardant wrapping tape of the cable, and solves the problem that the prior art lacks the basis for evaluating the failure of the flame-retardant wrapping tape after the operation; 2) a reference value for setting the time length of the aging simulation test is provided, and the technical problem that the performance of the flame-retardant wrapping tape is judged by simulating the operation condition after operation before operation is solved; 3) provides a method for evaluating the performance of small samples with small flames due to difficult sampling after operation.
Drawings
Fig. 1 is a flowchart of a performance evaluation and detection method for a cable flame-retardant wrapping tape after operation according to embodiment 1 of the present invention;
FIG. 2 is a flowchart of a method for evaluating and detecting the performance of a flame-retardant cable wrapping tape after operation according to embodiment 2 of the present invention;
fig. 3 is a flowchart of a performance evaluation and detection method for a cable flame-retardant wrapping tape after operation according to embodiment 3 of the present invention.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
Example 1: performance evaluation detection method for cable flame-retardant wrapping tape after operation
As shown in fig. 1, embodiment 1 of the present invention provides a method for evaluating and detecting performance of a cable after flame-retardant taping operation, by which a failure criterion reference value after the cable flame-retardant taping operation and an aging simulation time, that is, a flame-retardant taping failure simulation time reference value, can be obtained. The method comprises the following steps:
step 1, preparing a plurality of groups of strip-shaped cable flame-retardant wrapping tape samples, wherein each group of samples comprises a plurality of cable flame-retardant wrapping tape samples; one group of the cable flame-retardant wrapping tape samples is an unaged group, and the other groups of the cable flame-retardant wrapping tape samples are aging simulation groups.
And (3) each group of the cable flame-retardant belting sample belts are at least five, and the carbonization height of each group of the cable flame-retardant belting sample in the later step 5 is obtained by the average value of the carbonization heights of all the samples of each group of the cable flame-retardant belting sample, wherein the carbonization height refers to the distance from the ignition point to the highest carbonization point of the strip-shaped flame-retardant belting sample group after combustion.
And 2, carrying out an aging simulation test on all the aging simulation group cable flame-retardant wrapping tape samples, and taking out a group of cable flame-retardant wrapping tape samples from the aging simulation test according to set time nodes.
Step 2 may include: and (3) carrying out a humidification simulation test, putting the prepared samples into a constant temperature and humidity box, respectively taking out one group after the first set time, the second set time and the third set time for carrying out the subsequent steps, and putting the samples into a constant temperature and humidity chamber for balancing after the samples are taken out.
It is understood that the humidification simulation conditions can be set by one skilled in the art at will, and a preferred but non-limiting embodiment is that in the humidification simulation test, the constant temperature and humidity chamber is set to the humidity RH47 + -2 and the temperature 95 + -3 ℃ for simulating the aging of the flame-retardant wrapping tape.
Step 2 may further include: and (3) carrying out a saline aging resistance test, completely immersing the prepared samples into a glass instrument of saline solution with set concentration, respectively taking out a group of samples for testing after the first set time, the second set time and the third set time, and putting the samples into a constant temperature and humidity chamber for balancing after the samples are taken out.
It is understood that the brine aging resistance simulation conditions can be arbitrarily set by those skilled in the art, and a preferred but non-limiting embodiment is that the brine aging resistance test is performed by setting the concentration of the salt solution to be a 3% sodium chloride solution.
It is understood that the more the number of aging simulation sets is set, the higher the frequency of taking out the fire-retardant tape sample from the aging simulation test, and the more easily it is possible to obtain an accurate inflection point time. The time points at which the fire-retardant tape samples were taken out of the aging simulation test may be either uniform time points, for example, every 12 hours, 24 hours, etc., or non-uniform time points, for example, 7 days, 10 days, 15 days, i.e., a first set time period of 7 days, a second set time period of 10 days, and a third set time period of 15 days, and the inflection points are obtained by linking the test data at the respective time points with a smooth curve.
It is noted that the above described aging simulation tests are only preferred but not limiting aging simulations, and that a person skilled in the art may use more, less and other kinds of aging simulation tests, and that alternative aging simulation tests and their test conditions are within the scope of the inventive concept of the present invention.
And 3, placing the cable flame-retardant wrapping tape sample in a state adjusting chamber for state adjustment, drying the cable flame-retardant wrapping tape sample, and cooling to room temperature.
The cable flame-retardant wrapping tape sample is placed in a state adjusting chamber for state adjustment, namely, the strip sample is subjected to state adjustment for at least 48 hours at 23 +/-2 ℃ and 50% +/-5% relative humidity, and is taken out from a state adjusting test box and then is tested within 1 hour. It is understood that the state adjustment conditions and the drying conditions can be arbitrarily set by those skilled in the art, and the above conditions are only preferred but non-limiting embodiments.
And 4, carrying out a 50W blast lamp vertical burning test on the unaged group cable flame-retardant wrapping tape sample and the aging simulation group cable flame-retardant wrapping tape sample taken out from the aging simulation test in sequence.
And 5, measuring the carbonization height of the test sample of each group of the cable flame-retardant wrapping tape, wherein the carbonization height refers to the distance from a fire point to the highest carbonization point after the strip-shaped flame-retardant wrapping tape sample group is combusted, and obtaining the ratio of the carbonization height of the test sample of each group of the cable flame-retardant wrapping tape of the aging simulation group to the carbonization height of the test sample of the cable flame-retardant wrapping tape of the unaged group on the basis.
And 6, arranging the carbonization height ratios of the groups of the cable flame-retardant wrapping tape samples according to the sequence of the non-aging simulation time and the aging simulation time to obtain a group of flame-retardant wrapping tape samples with the ratio increasing trend inflection points, wherein the corresponding ratio is a cable flame-retardant wrapping tape failure criterion reference value, and the corresponding aging simulation time is a cable flame-retardant wrapping tape simulated failure time reference value.
It should be noted that, a person skilled in the art can obtain a reference value of the criterion for failure of the fireproof and flame-retardant tape of the cable by the method provided in example 1, and on the basis of the reference value, the person skilled in the art can set the criterion for failure of the fireproof and flame-retardant tape of the cable to be actually used according to the actual situation of the operation of the line. A preferred but non-limiting embodiment is to set different cable fire-retardant tape failure criteria in combination with safety margins on the basis of the reference values, for example, according to the interval of the operation time; or setting an evaluation criterion between partitions according to the reference value and the multiple thereof, setting the evaluation criterion in consideration of the safety margin, and the like. Any mode of setting the failure criterion of the fireproof and flame-retardant wrapping tape of the cable according to the failure criterion reference value of the fireproof and flame-retardant wrapping tape of the cable belongs to the inventive concept of the invention.
Similarly, the obtained aging simulation time reference value can be used as a guide for an aging simulation test, and a person skilled in the art can set the obtained aging simulation time on the basis of the obtained aging simulation time reference value. The two parameters are obtained, so that an aging simulation test can be accurately carried out, and a person skilled in the art can clearly know what test parameters can obtain an aging effect similar to that of actual operation and how to judge that the fireproof flame-retardant wrapping belt fails.
Example 2: performance evaluation detection method for cable flame-retardant wrapping tape after operation
As shown in fig. 2, embodiment 2 of the present invention provides a method for evaluating and detecting performance of a cable after operation, by which accurate aging simulation after operation of a flame-retardant wrapping tape before operation can be performed using an already obtained failure criterion and failure simulation time, so as to obtain an accurate performance evaluation and detection result after aging. The method comprises the following steps:
step 1, preparing a plurality of groups of strip-shaped cable flame-retardant wrapping tape samples by using the cable flame-retardant wrapping tape samples which are not wrapped, wherein each group of cable flame-retardant wrapping tape samples comprises a plurality of cable flame-retardant wrapping tape samples, one group of the cable flame-retardant wrapping tape samples is an unaged group, and the other groups of the cable flame-retardant wrapping tape samples are aging simulation groups.
And 2, carrying out aging simulation tests on each aging simulation group, and taking out a group of cable flame-retardant wrapping tape samples from the aging simulation tests according to set time nodes, wherein the time for taking out the last group of samples is not shorter than the simulation failure time.
And 3, placing the cable flame-retardant wrapping tape sample in a state adjusting chamber for state adjustment, drying the cable flame-retardant wrapping tape sample, and cooling to room temperature.
And 4, carrying out a 50W blast lamp vertical burning test on the unaged group cable flame-retardant wrapping tape sample and the aging simulation group cable flame-retardant wrapping tape sample taken out from the aging simulation test in sequence.
And 5, measuring the carbonization height of the test sample of each group of the cable flame-retardant wrapping tape, wherein the carbonization height refers to the distance from a fire point to the highest carbonization point after the strip-shaped flame-retardant wrapping tape sample group is combusted, and obtaining the ratio of the carbonization height of the test sample of each group of the cable flame-retardant wrapping tape of the aging simulation group to the carbonization height of the test sample of the cable flame-retardant wrapping tape of the unaged group on the basis.
And 6, arranging the carbonization height ratio of the cable flame-retardant wrapping tape samples of each group according to the sequence of the aging simulation time and the aging simulation time, and comparing the carbonization height ratio with the failure criterion of the cable flame-retardant wrapping tape to judge whether the cable flame-retardant wrapping tape fails before and after the simulation failure time. The aging simulation time can be longer or shorter than the simulated failure time obtained by the method described in example 1, and is used for observing the performance of the flame-retardant wrapping tape of the cable under different aging simulation conditions.
The simulated failure time in the step 2 and the criterion of the cable flame-retardant tape failure in the step 5 are set according to the reference value of the simulated failure time of the cable flame-retardant tape failure criterion obtained by the evaluation detection method in claim 1. In a preferred but non-limiting embodiment, the criterion for the failure of the cable flame-retardant wrapping tape is that the ratio of the charring height after operation to the charring height before operation is not less than 1.3, and when the ratio of the charring height after operation to the charring height before operation is more than or equal to 1.3, the cable flame-retardant wrapping tape is judged to be failed.
Example 3: performance evaluation detection method for cable flame-retardant wrapping tape after operation
As shown in fig. 3, example 3 of the present invention provides a method for evaluating and detecting the performance of a cable after flame-retardant tape is put into operation, by which accurate performance evaluation and detection can be performed after aging of the flame-retardant tape after being put into operation, using the obtained failure criterion. The method comprises the following steps:
step 1, collecting cable flame-retardant wrapping tape samples on cables which are wrapped with the cable flame-retardant wrapping tape and run, recording the cable flame-retardant wrapping tape samples as a running group, preparing a group of cable flame-retardant wrapping tape samples by using the same type of cable flame-retardant wrapping tape samples which are not wrapped, recording the group of cable flame-retardant wrapping tape samples as a control group, and enabling each group of samples to contain a plurality of cable flame-retardant wrapping tape samples.
And each group of the cable flame-retardant wrapping tape test sample tapes is at least five, and the carbonization height of each group of the cable flame-retardant wrapping tape test samples is calculated by the average value of the carbonization heights of all the test samples of each group of the cable flame-retardant wrapping tape test samples.
The collected strip-shaped test sample with the flame-retardant wrapping belts has the length of 125mm +/-5 mm, the width of 13.0 mm +/-0.5 mm and smooth edges. It can be understood that after the flame-retardant wrapping tape runs for a long time, the flame-retardant wrapping tape can be collected relatively easily according to the specifications, and the detection and evaluation can be carried out by matching with a small-flame combustion test.
The flame-retardant wrapping tape collected in the step 1 comprises: the plastic flame-retardant bag belt comprises a plastic flame-retardant bag belt and a rubber flame-retardant bag belt, wherein a plastic film is removed in a test before the self-adhesive rubber flame-retardant bag belt is used.
And 2, placing the cable flame-retardant wrapping tape sample collected in the step 1 in a state adjusting chamber for state adjustment, drying the cable flame-retardant wrapping tape sample, and cooling to room temperature.
The cable flame-retardant wrapping tape sample is placed in a state adjusting chamber for state adjustment, namely, the strip sample is subjected to state adjustment for at least 48 hours at 23 +/-2 ℃ and 50% +/-5% relative humidity, and is taken out from a state adjusting test box and then is tested within 1 hour.
And 3, performing a 50W blast lamp vertical combustion test on the running group cable flame-retardant wrapping tape sample and the control group cable flame-retardant wrapping tape sample. The 50W torch vertical burning test is a 50W vertical flame test.
And 4, measuring the carbonization height of each group of the cable flame-retardant wrapping tape samples, wherein the carbonization height refers to the distance from a fire point to the highest carbonization point after the strip-shaped flame-retardant wrapping tape sample group is combusted, and obtaining the ratio of the carbonization height of the operating group cable flame-retardant wrapping tape samples to the carbonization height of the control group cable flame-retardant wrapping tape samples on the basis.
And 5, comparing the carbonization height ratio with the failure criterion of the flame-retardant cable wrapping tape, and obtaining whether the performance evaluation detection result of the flame-retardant cable wrapping tape at the sampling time after operation is failed.
Setting a cable fire-retardant tape failure criterion according to the cable fire-retardant tape failure criterion reference value obtained in claim 1; in a preferred but non-limiting embodiment, if the combustion classification V-0 and the char height ratio does not exceed the first set value, the conclusion is assessed as continuing operation; if the combustion grade V-1 or the carbonization height ratio is greater than a first set value and does not exceed a second set value, evaluating the conclusion as attention, and setting time tracking detection at intervals; and if the combustion grade V-2 is not met, or the vertical combustion grade is not met, or the carbonization height ratio exceeds a second set value, the evaluation conclusion is failure, and the operation is quit.
A preferred but non-limiting embodiment is a method according to GB/T2408-2008/IEC 60695-11-10: 1999 as the basis for combustion staging.
Further preferably, the first set value is 1.3, the second set value is 1.5, and the set interval time is half a year.
Example 4: performance evaluation detection system utilizing performance evaluation detection method after operation of cable flame-retardant wrapping tape
A performance evaluation detection system using the method for evaluating and detecting the performance of the flame-retardant wrapping tape of the cable after operation comprises the following steps:
the constant temperature and humidity box is used for a damp and hot aging simulation test.
And the glass container is used for a brine aging resistance simulation test.
The device comprises a 50W5 flame burning test device, a state adjusting chamber, a straight ruler and a cotton wool pad, and is used for a burning test.
Example (c):
in order to further clearly describe the technical solution of the present invention and the advantageous technical effects thereof, the following description is given of an application example.
As can be seen from table 1, the flame retardant wrap tape exhibited a reduction in fire performance regardless of humid heat aging and salt water aging; the carbonization length is steadily increased.
TABLE 1 carbonization height comparison
| Height of carbonization in mm | Belt 1 | Belt 2 | Plastic class average | Tape 3 | Belt 4 | Rubber-like average |
| Not aged | 5.7 | 8 | 6.85 | 3.6 | 3.7 | 3.65 |
| Damp heat aging for 7 days | 6.8 | 9 | 7.9 | 5.7 | 5.3 | 5.5 |
| Heat and humidity aging for 10 days | 9.5 | 9.7 | 9.6 | 6.1 | 6.2 | 6.15 |
| Damp heat aging for 15 days | 9.6 | 9.7 | 9.65 | 6.2 | 6.4 | 6.3 |
| Resisting aging of saline water for 7 days | 8.5 | 7.9 | 8.2 | 5.5 | 5.1 | 5.3 |
| Resisting salt water aging for 10 days | 9.3 | 10.8 | 10.05 | 6 | 5.9 | 5.95 |
| Resisting salt water aging for 15 days | 9.5 | 10.9 | 10.2 | 6.1 | 6.0 | 6.05 |
For the fire-retardant and fire-retardant wrapping tape already in operation, the following table shows the performance evaluation and detection method after one cable fire-retardant and fire-retardant wrapping tape disclosed in embodiment 3 of the invention is used, and the cable fire-retardant and fire-retardant wrapping tape can be sampled, evaluated and detected according to the following method period.
TABLE 2 evaluation of test periods
| Currently installed cable flame-retardant wrapping tape | Currently uninstalled cable flame-retardant wrapping tape |
| / | 1 time before installation |
| The sample is taken 1 time every 1 year after 1-5 years of installation. | / |
| Have been installed for more than 5 years with 1 sampling every 0.5 years. | / |
The following table shows an example of the evaluation performed by the method for testing the performance evaluation after the cable fire-retardant wrapping tape disclosed in example 3 of the present invention is used.
Table 3 evaluation results of charring height ratio of fire-retardant wrapping tape
| Line name Balance | Operating time length Moon cake | Whether or not there is transport of submerged water Row history | Manufacturer of the product | Put into operation Front side | Put into operation Rear end | Average carbonization height Degree ratio | Burning before delivery Grade | Burning after delivery Grade | Detection conclusion | Remarks for note |
| Line 1 | 11.4 | Whether or not | Manufacturer A | 63.4 | 30.2 | 0.48 | V-0 | V-0 | Continuously operates | |
| Line 2 | 11.8 | Whether or not | Manufacturer A | 44.2 | 47.2 | 1.07 | V-0 | V-0 | Continuously operates | |
| Line 3 | 14.9 | Is that | Manufacturer A | 44.2 | 37.4 | 0.85 | V-0 | V-0 | Continuously operates | |
| Line 4 | 14.1 | Is that | Manufacturer A | 41.8 | 38.6 | 0.92 | V-0 | V-0 | Continuously operates | |
| Line 5 | 14.1 | Is that | Manufacturer A | 44.2 | 32.4 | 0.73 | V-0 | V-0 | Continuously operates | |
| Line 6 | 11.2 | Is that | Manufacturer A | 44.2 | 45.6 | 1.03 | V-0 | V-0 | Continuously operates | |
| Line 7 | 13.5 | Is that | Manufacturer A | 44.2 | 35.4 | 0.8 | V-0 | V-0 | Continuously operates | |
| Line 8 | 11.9 | Is that | Manufacturer A | 31.2 | 20 | 0.64 | V-0 | V-0 | Continuously operates | |
| Line 9 | 3 | Is that | Manufacturer A | 35.6 | 42.6 | 1.2 | V-0 | V-0 | Continuously operates | |
| Line 10 | 13.3 | Is that | Manufacturer B | 92.8 | 65.6 | 0.71 | V-1 | V-1 | Fail to work | Burn to the clamp, it is inconsistent Combined combustion classification |
| Line 11 | 11.9 | Whether or not | Manufacturer C | 44.8 | 60.3 | 1.35 | V-0 | V-0 | Attention | |
| Line 12 | 11.9 | Whether or not | Manufacturer A | 41.6 | 32 | 0.77 | V-0 | V-0 | Continuously operates | |
| Line 13 | 11.3 | Is that | Manufacturer A | 40 | 44.2 | 1.11 | V-0 | V-0 | Continuously operates | |
| Line 14 | 11 | Whether or not | Manufacturer A | 22.4 | 48.2 | 2.15 | V-0 | V-0 | Fail to work | |
| Line 15 | 28.9 | Whether or not | Manufacturer A | 22.4 | 37.96 | 1.69 | V-0 | V-0 | Fail to work |
Compared with the prior art, the method has the beneficial effects that 1) the method provides a failure criterion reference value after the operation of the flame-retardant wrapping tape of the cable, and solves the problem that the prior art lacks the basis for evaluating the failure of the flame-retardant wrapping tape after the operation; 2) a reference value for setting the time length of the aging simulation test is provided, and the technical problem that the performance of the flame-retardant wrapping tape is judged by simulating the operation condition after operation before operation is solved; 3) provides a method for evaluating the performance of small samples with small flames due to difficult sampling after operation.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (16)
1. A performance evaluation detection method for a cable flame-retardant wrapping tape after operation is characterized by comprising the following steps:
step 1, preparing a plurality of groups of strip-shaped cable flame-retardant wrapping tape samples, wherein each group of samples comprises a plurality of cable flame-retardant wrapping tape samples; one group of cable flame-retardant wrapping tape samples are an unaged group, and the other groups of cable flame-retardant wrapping tape samples are aging simulation groups;
step 2, carrying out an aging simulation test on all the aging simulation group cable flame-retardant wrapping tape samples, and taking out a group of cable flame-retardant wrapping tape samples from the aging simulation test according to a set time node;
step 3, placing the cable flame-retardant wrapping tape sample in a state adjusting chamber for state adjustment, then drying the cable flame-retardant wrapping tape sample, and cooling to room temperature;
step 4, carrying out a 50W blast lamp vertical burning test on the unaged group cable flame-retardant wrapping tape sample and the aging simulation group cable flame-retardant wrapping tape sample taken out from the aging simulation test in sequence;
step 5, measuring the carbonization height of each group of cable flame-retardant wrapping tape samples to obtain the ratio of the carbonization height of each group of cable flame-retardant wrapping tape samples of the aging simulation group to the carbonization height of the cable flame-retardant wrapping tape samples of the unaged group;
and 6, arranging the carbonization height ratios of the groups of the cable flame-retardant wrapping tape samples according to the sequence of the non-aging simulation time and the aging simulation time to obtain a group of flame-retardant wrapping tape samples with the ratio increasing trend inflection points, wherein the corresponding ratio is a cable flame-retardant wrapping tape failure criterion reference value, and the corresponding aging simulation time is a cable flame-retardant wrapping tape simulated failure time reference value.
2. A performance evaluation detection method for a cable flame-retardant wrapping tape after operation is characterized by comprising the following steps:
step 1, preparing a plurality of groups of strip-shaped cable flame-retardant wrapping tape samples by using the cable flame-retardant wrapping tape samples which are not wrapped, wherein each group of cable flame-retardant wrapping tape samples comprises a plurality of cable flame-retardant wrapping tape samples, one group of cable flame-retardant wrapping tape samples is an unaged group, and the rest groups are aging simulation groups;
step 2, carrying out aging simulation tests on each aging simulation group, and taking out a group of cable flame-retardant wrapping tape samples from the aging simulation tests in sequence according to set time nodes, wherein the time for taking out the last group of samples is not shorter than the simulation failure time;
step 3, placing the cable flame-retardant wrapping tape sample in a state adjusting chamber for state adjustment, then drying the cable flame-retardant wrapping tape sample, and cooling to room temperature;
step 4, carrying out a 50W blast lamp vertical burning test on the unaged group cable flame-retardant wrapping tape sample and the aging simulation group cable flame-retardant wrapping tape sample taken out from the aging simulation test in sequence;
step 5, measuring the carbonization height of each group of cable flame-retardant wrapping tape samples to obtain the ratio of the carbonization height of each group of cable flame-retardant wrapping tape samples of the aging simulation group to the carbonization height of the cable flame-retardant wrapping tape samples of the unaged group;
and 6, arranging the carbonization height ratio of the cable flame-retardant wrapping tape samples of each group according to the sequence of the aging simulation time and the aging simulation time, and comparing the carbonization height ratio with the failure criterion of the cable flame-retardant wrapping tape to judge whether the cable flame-retardant wrapping tape fails before and after the simulation failure time.
3. The method for evaluating and detecting the performance of the cable flame-retardant wrapping tape after operation according to claim 2, wherein the method comprises the following steps:
the simulated failure time in the step 2 and the criterion of the cable flame-retardant tape failure in the step 5 are set according to the reference value of the criterion of the cable flame-retardant tape failure and the reference value of the simulated failure time obtained by the evaluation detection method in claim 1.
4. The method for detecting the performance evaluation of the cable flame-retardant tape after operation according to any one of claims 1 to 3, wherein:
the step 2 comprises the following steps: and (3) carrying out a humidification simulation test, putting the prepared samples into a constant temperature and humidity box, respectively taking out one group after the first set time, the second set time and the third set time for carrying out the subsequent steps, and putting the samples into a constant temperature and humidity chamber for balancing after the samples are taken out.
5. The method for evaluating and detecting the performance of the cable flame-retardant wrapping tape after operation according to claim 4, wherein the method comprises the following steps:
in the humidification simulation test, the constant temperature and humidity box is set to be RH47 +/-2 at 95 +/-3 ℃.
6. The method for detecting the performance evaluation of the cable flame-retardant tape after operation according to any one of claims 1 to 3, wherein:
the step 2 comprises the following steps: and (3) carrying out a saline aging resistance test, completely immersing the prepared samples into a glass instrument of saline solution with set concentration, respectively taking out a group of samples for testing after the first set time, the second set time and the third set time, and putting the samples into a constant temperature and humidity chamber for balancing after the samples are taken out.
7. The method for evaluating and detecting the performance of the cable flame-retardant wrapping tape after operation according to claim 6, wherein the method comprises the following steps:
in the brine aging resistance test, a salt solution with a set concentration is a 3% sodium chloride solution.
8. The method for evaluating and detecting the performance of the cable flame-retardant wrapping tape after operation according to claim 5 or 7, wherein the method comprises the following steps:
the first set period of time is 7 days, the second set period of time is 10 days, and the third set period of time is 15 days.
9. A performance evaluation detection method for a cable flame-retardant wrapping tape after operation is characterized by comprising the following steps:
step 1, collecting cable flame-retardant wrapping tape samples on cables which are wrapped with cable flame-retardant wrapping tapes and run, marking as a running group, preparing a group of cable flame-retardant wrapping tape samples by using the same type of cable flame-retardant wrapping tape samples which are not wrapped, and marking as a control group, wherein each group of samples comprises a plurality of cable flame-retardant wrapping tape samples;
step 2, placing the cable flame-retardant wrapping tape sample collected in the step 1 in a state adjusting chamber for state adjustment, then drying the cable flame-retardant wrapping tape sample, and cooling to room temperature;
step 3, performing a 50W blast lamp vertical combustion test on the running group cable flame-retardant wrapping tape test sample and the control group cable flame-retardant wrapping tape test sample;
step 4, measuring the carbonization height of each group of cable flame-retardant wrapping tape samples to obtain the ratio of the carbonization height of the operating group of cable flame-retardant wrapping tape samples to the carbonization height of the control group of cable flame-retardant wrapping tape samples;
and 5, comparing the carbonization height ratio with the failure criterion of the flame-retardant cable wrapping tape to obtain a performance evaluation detection result after the flame-retardant cable wrapping tape operates at the sampling time.
10. The method for evaluating and detecting the performance of the cable flame-retardant wrapping tape after operation according to claim 9, wherein the method comprises the following steps:
setting a cable fire-retardant tape failure criterion according to the cable fire-retardant tape failure criterion reference value obtained in claim 1;
if the combustion grade is V-0 and the carbonization height ratio does not exceed a first set value, the evaluation conclusion is to continue the operation;
if the combustion grade V-1 or the carbonization height ratio is greater than a first set value and does not exceed a second set value, evaluating the conclusion as attention, and setting time tracking detection at intervals;
and if the combustion grade V-2 is not met, or the vertical combustion grade is not met, or the carbonization height ratio exceeds a second set value, the evaluation conclusion is failure, and the operation is quit.
11. The method for detecting the performance evaluation of the cable flame-retardant tape after running according to any one of claims 1, 2 or 9, wherein:
and each group of the cable flame-retardant wrapping tape test sample tapes is at least five, and the carbonization height of each group of the cable flame-retardant wrapping tape test samples is calculated by the average value of the carbonization heights of all the test samples of each group of the cable flame-retardant wrapping tape test samples.
12. The method for detecting the performance evaluation of the cable flame-retardant tape after running according to any one of claims 1, 2 or 9, wherein:
the cable flame-retardant wrapping tape sample is placed in a state adjusting chamber for state adjustment, namely, the strip sample is subjected to state adjustment for at least 48 hours at 23 +/-2 ℃ and 50% +/-5% relative humidity, and is taken out from a state adjusting test box and then is tested within 1 hour.
13. The method for evaluating and detecting the performance of the cable flame-retardant wrapping tape after operation according to claim 9, wherein the method comprises the following steps:
in the step 1, the collected strip-shaped test sample with the flame-retardant wrapping belts has the length of 125mm +/-5 mm, the width of 13.0 mm +/-0.5 mm and smooth edges.
14. The method for evaluating and detecting the performance of the cable flame-retardant wrapping tape after operation according to claim 9 or 13, wherein the method comprises the following steps:
the flame-retardant wrapping tape collected in the step 1 comprises: the plastic flame-retardant bag belt comprises a plastic flame-retardant bag belt and a rubber flame-retardant bag belt, wherein a plastic film is removed in a test before the self-adhesive rubber flame-retardant bag belt is used.
15. The method for evaluating and detecting the performance of the cable flame-retardant wrapping tape after operation according to claim 10, wherein the method comprises the following steps:
the first set value is 1.3, the second set value is 1.5, and the set interval time is half a year.
16. A performance evaluation detection system using the method for performance evaluation detection after operation of the cable flame-retardant tape according to any one of claims 1 to 15, wherein the method comprises the following steps:
the constant temperature and humidity box is used for a damp and hot aging simulation test;
the glass container is used for a brine aging resistance simulation test;
the device comprises a 50W flame combustion test device, a state adjusting chamber, a ruler and a cotton wool pad, and is used for a combustion test.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113884615A (en) * | 2021-08-31 | 2022-01-04 | 中国核电工程有限公司 | Flame-retardant test method for cable heat-shrinkable tubing |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014040739A (en) * | 2012-08-22 | 2014-03-06 | Takenaka Komuten Co Ltd | Fireproof performance evaluation method for non-fire-resistant coated cft column |
| CN105259297A (en) * | 2015-10-12 | 2016-01-20 | 肇庆俊富纤网材料有限公司 | Testing method of fiber flame-retardant performance |
| CN105548457A (en) * | 2015-12-10 | 2016-05-04 | 中国航空工业集团公司西安飞机设计研究所 | Testing method for fireproof performance of firewall sealant |
| CN105866015A (en) * | 2016-05-12 | 2016-08-17 | 远东电缆有限公司 | Method and system for evaluating ageing life of crosslinked polyethylene insulating cable for smart energy |
| CN109190767A (en) * | 2018-07-27 | 2019-01-11 | 东华大学 | A kind of inflaming retarding fabric ageing of performance prediction technique based on machine learning |
| CN111521552A (en) * | 2020-05-15 | 2020-08-11 | 南京工业大学 | Test method for testing aging of intumescent steel structure fireproof coating in industrial environment |
-
2021
- 2021-01-20 CN CN202110071932.5A patent/CN112881586B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014040739A (en) * | 2012-08-22 | 2014-03-06 | Takenaka Komuten Co Ltd | Fireproof performance evaluation method for non-fire-resistant coated cft column |
| CN105259297A (en) * | 2015-10-12 | 2016-01-20 | 肇庆俊富纤网材料有限公司 | Testing method of fiber flame-retardant performance |
| CN105548457A (en) * | 2015-12-10 | 2016-05-04 | 中国航空工业集团公司西安飞机设计研究所 | Testing method for fireproof performance of firewall sealant |
| CN105866015A (en) * | 2016-05-12 | 2016-08-17 | 远东电缆有限公司 | Method and system for evaluating ageing life of crosslinked polyethylene insulating cable for smart energy |
| CN109190767A (en) * | 2018-07-27 | 2019-01-11 | 东华大学 | A kind of inflaming retarding fabric ageing of performance prediction technique based on machine learning |
| CN111521552A (en) * | 2020-05-15 | 2020-08-11 | 南京工业大学 | Test method for testing aging of intumescent steel structure fireproof coating in industrial environment |
Non-Patent Citations (5)
| Title |
|---|
| 中华人民共和国公安部 发布: "电缆用阻燃包带", 《中华人民共和国公共安全行业标准》 * |
| 傅晓杰 等: "一种新型防火材料在电缆运行中的应用研究", 《上海节能》 * |
| 刘少岳 等: "国产防火阻燃包带的试验研究", 《电缆与附件安装运行》 * |
| 王霁等: "专用防火涂料对电缆受热时绝缘失效的影响", 《消防科学与技术》 * |
| 舒中俊等: "交联聚乙烯塑料电缆绝缘失效的实验研究", 《消防科学与技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113884615A (en) * | 2021-08-31 | 2022-01-04 | 中国核电工程有限公司 | Flame-retardant test method for cable heat-shrinkable tubing |
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