CN110082656A - A kind of method and device thereof of cable aging dealing monitoring - Google Patents

Abstract

The present invention provides a kind of methods of cable aging dealing monitoring, and the standard cable of cable under test and regular length is assembled to form subject cable, and the standard cable has stable dielectric constant；By DDS signal generator signal source output by being tested cable after power amplifier；Frequency domain analysis through impedance spectrum or phase frequency spectrum or the time domain reflectometry containing power energy obtain subject cable computational length L1；According to the subject cable computational length L1 compared with being tested cable physical length L0, this method is calculated by means of standard cable and cable length can not only assess the aging conditions of cable under test the process that can also monitor aging reparation, be a kind of means of very reliable and economic.

Description

A method and device for cable aging control monitoring

technical field

The invention belongs to the technical field of electric power equipment, and relates to a method and a device for cable aging control and monitoring.

Background technique

Insulated power equipment, especially insulated cables, are widely used in distribution networks. A slight carelessness in the construction process of cables can cause scratches or cracks in the insulation layer, causing the insulated cables to be damp; It has the effect of damp, and the cable runs under high load conditions for a long time, which leads to premature aging of the cable. Once moisture or water enters the cable, it will penetrate longitudinally from the gap between the outer copper tape shield of the cable insulation and the gap between the conductors. In severe cases, the test results will not meet the standard and the power transmission will not be able to be delivered as scheduled. In light cases, under the action of water vapor under the action of a strong electric field, the cable will produce "water tree branches", which will reduce the insulation performance of the cable, and may even cause cable insulation breakdown within 5 to 10 years. Therefore, if the damp cable is not treated or treated thoroughly, it will leave hidden dangers to the power supply system, and may cause accidents during operation, resulting in economic losses and even life-threatening.

In order to solve the "water tree branches" phenomenon and aging defects of cables, the solution of water tree aging treatment and repair for cross-linked vinyl cables is usually used, and its application has greatly improved the reliability of high-voltage power cables. , the economic benefit is obvious, but it has the following defects:

1) Mainly for cables with severe overall aging. For local aging, it is impossible to judge whether there is local aging, or the location of local aging, which leads to blind aging repair and consumes a lot of repair fluid.

2) The method of nano-filling slowly penetrates into the cable insulation layer under pressure. For a cable of 1 km, the penetration time may be as long as 8 hours to 12 hours. Even some cables with intermediate joints may have nano-liquids that cannot pass through, resulting in Repair fails.

3) The current aging repair cannot track the repair status in real time during the repair process, and can only compare the dielectric loss or leakage current before and after the repair. Since the compared data is only for the overall insulation parameters of the cable, there is no technical means to obtain the effect of local repair, such as the repair situation of a certain area.

SUMMARY OF THE INVENTION

In order to solve the problems raised in the background art above. The present invention provides a method for cable aging management and monitoring. The method monitors the repair state from multiple links such as test, repair, and tracking repair, and can know the local and overall repair conditions of the cable in time. When the area has been repaired, the repair can be stopped or the repair time can be reduced to improve repair efficiency and save repair fluid.

The concrete technical scheme that realizes the object of the invention is:

An object of the present invention is to provide a method for cable aging management monitoring, said method includes aging assessment, can assess the aging situation of cables, including the following steps:

S1: Assembling the cable to be tested with a fixed-length standard cable to form a tested cable, the standard cable has a stable dielectric constant and length;

S2: The output signal source of the DDS signal generator passes through the power amplifier and then passes through the tested cable;

S3: Obtain the calculated length L1 of the tested cable through the frequency domain analysis method of impedance spectrum or phase spectrum;

S4: Comparing the calculated length L1 of the tested cable with the actual length L0 of the tested cable, judge whether the cable is aging or judge the degree of cable aging: when L1=L0, the aging control cable does not appear aging phenomenon, when L1< At L0, the aging treatment cable has already experienced aging phenomenon, and the smaller L1 is, the more serious the aging phenomenon is.

Further, during the cable repair process, the S3 step can be started regularly or monitored in real time to obtain the calculated length L1 of the tested cable, the change of the L1 can judge the repair degree of the aging control cable, and the closer the value of the L1 is to L0, indicating that the repair is closer to completion.

Further, the present invention also provides a cable aging management method comprising the following steps:

A1: Aging assessment, judging whether the aging treatment cable needs to be repaired through the aging assessment of the cable aging treatment monitoring method;

A2: Aging location, through the cable aging control monitoring method, move the test position of the aging control cable, find the area with a large change value in the L1, which is the aging area;

A3: Monitoring and repairing. Drill holes at the front and rear ends of the aging area or add terminals to contact the metal layer or the armor layer, inject repair liquid to eliminate moisture and fill the deterioration gap. The repair process can be monitored through cable aging management The method starts periodically or monitors the repair degree in real time until the repair is completed;

A4: Insulation sealed.

The method for cable aging control and monitoring can be applied to various steps of cable aging control, such as aging assessment, aging location, and monitoring and repair.

Further, in the step A3, before injecting the repair liquid, the input gas is charged for a certain period of time, and the input gas includes one of pure air, helium, SF6 gas, argon, and a hydrophilic chemical gas or Various.

Further, the repair liquid is insulating oil, silicone, silicone rubber liquid, phenylmethyldialkoxysilane (PhMeSi(OR) ₂ ), phenylmethyldimethoxysilane (PhMeSi(OMe) ₂ ), one or more of hydrophobic silicon dioxide liquid, superhydrophobic silicon dioxide liquid.

Further, in the A3: monitoring and repairing step, current is passed through the cable core to generate heat and an electric field to heat the insulating layer.

Another object of the present invention is to provide a cable aging management monitoring device, the monitoring device includes: a central controller, a monitoring unit, the cable under test; the monitoring unit includes a signal acquisition system, a DDS signal generator, a power amplifier; the The central controller is respectively connected with the signal acquisition system and the DDS signal generator; the DDS signal generator is connected with the power amplifier, and the tested cable is respectively connected with the signal acquisition system and the power amplifier.

The present invention also provides a cable aging management device, which includes:

Central controller, tested cable;

A monitoring unit, including a signal acquisition system and a sequentially connected DDS signal generator and power amplifier;

High frequency heating element;

Inflatable unit: contains relays and compressors connected in sequence;

Restoration liquid injection unit: includes repair liquid injection pumps, injection valves, flow monitors, and multi-phase synchronous valves connected in sequence;

The central controller is respectively connected to the monitoring unit and the inflation unit; the tested cable is respectively connected to the monitoring unit, the high-frequency heating element, and the repair liquid injection unit;

The power amplifier is connected with the high frequency heating element.

Further, the inflation unit is a gas inflation tank.

The relay is connected with the central controller, the compressor is connected with the repair liquid injection pump, and the multi-phase synchronous valve is connected with the cable under test.

Further, there are multiple repair liquid injection pumps in the repair liquid injection system.

Further, the device also includes a negative pressure unit.

Further, the negative pressure unit also includes a recovery system.

Further, the restoration liquid injection unit further includes one or more of an air pressure sensor, a flow rate sensor, a gas sensor, and an acoustic sensor.

Compared with the prior art, the beneficial effects of the present invention are:

1. The present invention provides a method for cable aging management and monitoring. This method can not only evaluate the aging condition of the cable to be tested, locate the aging area, but also monitor the aging repair process by means of standard cables and cable length calculations. It is a very reliable and economical means;

2. The method of the present invention can know the local and overall repair status of the cable in time, and can stop the repair or reduce the repair time when the known severe aging area has been repaired, so as to improve the repair efficiency and save the repair liquid;

3. The method of the present invention can heat-treat the capacitive insulating layer of the tested cable while monitoring, so that the electric field of the capacitive insulating layer is uniform and maintains a certain temperature, so that the repairing precision of the nanometer repairing liquid is improved. The flow velocity in the cable is increased, thus improving the repair efficiency.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached image:

Fig. 1 is the structural representation of a kind of cable aging control monitoring device of the present invention;

Fig. 2 is a structural schematic diagram of a cable aging treatment device of the present invention.

Fig. 3 is tested cable structural diagram of the present invention

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

In conjunction with Figure 1, a cable aging management monitoring device, the device includes:

central controller;

monitoring unit;

The cable under test;

The monitoring unit includes a signal acquisition system, a DDS signal generator, and a power amplifier;

The central controller is respectively connected with the signal acquisition system and the DDS signal generator; the DDS signal generator is connected with the power amplifier, and the tested cable is respectively connected with the signal acquisition system and the power amplifier.

The tested cable is assembled from the tested cable and a fixed-length standard cable. As a part of the tested cable, the standard cable has been calibrated in advance and can be considered as a stable constant, that is, it has a stable dielectric constant and length;

Specifically, the cable to be tested is connected in series with the standard cable, as shown in FIG. 3 .

It should be noted that the series connection sequence of the cables under test includes two types, standard cable+test cable or test cable+standard cable. More preferably, the standard cable is used first, and then the cable to be tested is used. This series connection method is more convenient in terms of calculation.

Specifically, the standard cable length is 0.1 meter to 300 meters, more preferably, the standard cable length is 100 meters.

The output signal source of the DDS signal generator passes through the tested cable after passing through the power amplifier, and the signal is collected by the signal acquisition system through the frequency domain analysis method of impedance spectrum or phase spectrum or the time domain reflection method containing power energy to obtain the calculated length L1 of the tested cable;

Since the DDS output passes through the power amplifier, its test impedance spectrum or phase spectrum is a continuous frequency sweep signal, and it already has the function of collecting output voltage and feedback current when testing impedance. Of course, DDS can also output a single frequency signal and collect its reflected voltage or current signal, so it is a power-containing TDR time-domain reflection signal analysis method. Compared with the traditional TDR pulse voltage reflection method without power, the reflected voltage waveform may be attenuated. deformation, or there is a problem of severe attenuation of signal gain, the solution of this project can better make up for this defect. In practical applications, since the DDS output voltage has load capacity, it can be analyzed separately for reflected voltage and feedback current, or calculated for reflected voltage and feedback current power to obtain reflected power to analyze the time difference between incident power and reflected power to calculate cable length L1;

It should be noted that the output of the power amplifier and the supporting acquisition system can be single-channel, that is, single-core cable monitoring, or multi-channel, which can realize the monitoring of three-phase or multi-phase cables.

According to the comparison between the calculated length L1 of the tested cable and the actual length L0 of the tested cable, judge whether the cable is aging or judge the degree of cable aging: when L1=L0, the aging control cable does not appear aging phenomenon; when L1<L0 , the aging treatment cable has aging phenomenon, and the smaller L1 is, the more serious the aging phenomenon is.

Furthermore, by collecting signals from different positions of the tested cable, the calculated L1 value is compared with L0, and the point where L1 changes abruptly can obtain a more accurate aging area of the tested cable, which is of great significance to the repair of the cable.

Example 2

In conjunction with Figure 2, a cable aging management device, the device includes:

Central controller, tested cable;

A monitoring unit, including a signal acquisition system, a DDS signal generator, and a power amplifier connected in sequence;

High frequency heating element;

Inflatable unit: contains relays and compressors connected in sequence;

Restoration liquid injection unit: includes repair liquid injection pumps, injection valves, flow monitors, and multi-phase synchronous valves connected in sequence;

The central controller is respectively connected to the monitoring unit and the inflation unit; the tested cable is respectively connected to the monitoring unit, the high-frequency heating element, and the repair liquid injection unit;

The power amplifier is connected with the high frequency heating element.

It should be noted that a solution is provided for the problem of slow penetration of the repair liquid and a long time-consuming problem during the repair of long-distance cables. The power amplifier is connected with the high-frequency heating element, and can heat the capacitive insulating layer of the tested cable, so that the electric field of the capacitive insulating layer is uniform, and maintain a certain temperature, and apply high temperature to the capacitive insulating layer of the cable. The high-frequency current signal makes the heating of the capacitive insulating layer uniform under the high-frequency electric field, and the activity of the internal water molecules increases, which is beneficial to the chemical neutralization of the repair liquid and micro-water, so that the repair precision of the repair liquid is improved, and the flow rate in the cable be improved, thereby improving the repair efficiency.

Specifically, among the tested cables, the standard cable is first, and the tested cable is connected in series after the latter, and the multi-phase synchronous valve is connected to the perforated part of the tested cable to inject repair fluid.

Specifically, the gas filling unit also includes a set of gas filtering device, so that the gas is filtered by humidity and impurities before being poured into the cable.

It should be noted that the charging unit can be replaced by a gas filling tank; the charging system can also be a gas filling tank, etc., which can provide the system with pressure gas, and the gas includes inert gas, insulating gas, such as pure air , helium, SF6 gas, argon, one or more of gases containing hydrophilic chemicals.

Specifically, there are multiple repair liquid injection pumps in the repair liquid injection system, which can inject different types of repair liquids. The repair liquid is injected into the interior of the cable through the repair liquid injection pump, injection valve, flow monitor and multi-phase synchronization valve, and fills the interior of the cable.

It should be noted that the restoration liquid is insulating oil, silicone, phenylmethyldialkoxysilane (PhMeSi(OR) ₂ ), phenylmethyldimethoxysilane (PhMeSi(OMe) ₂ ), titanium dioxide, One or more of silicone rubber liquid, siloxane, hydrophobic silicon dioxide liquid, and superhydrophobic silicon dioxide liquid. For the insulation structure of low-voltage cables, the insulation performance can be improved by injecting insulating oil, or by injecting silicone nanomaterials or other liquids that can improve insulation performance. It is not ideal, but the use of insulating oil has obvious advantages: the rated voltage of the low-voltage cable is low, and the filled insulating oil changes the material of its insulating layer, which can better repair the damage or aging phenomenon between the multi-strand wire cores; the filled insulating oil can The use of recycled oil with relatively low dielectric strength, such as waste transformers and capacitors above 10kV, not only increases the value of resource recycling, but also reduces the purchase cost of filling oil. Especially for the power grid company or the power supply part, there are a large number of low-voltage secondary control cables in the substation, and there are also a large number of transformers and capacitors replaced by waste. After the effective combination of the two, it not only improves the insulation capacity of the low-voltage control cables, but also The operation and maintenance cost is reduced, and the service life of the secondary control cable can also be improved to a certain extent, and its economic value is very obvious.

Specifically, the device also includes a negative pressure unit. The negative pressure unit is an air extraction device, which can start the air extraction when the inflation system is inflated; it can also increase the flow rate of the repair liquid during the inflation process and the restoration liquid injection process.

Specifically, the negative pressure unit also includes a recovery system. It can realize the recovery function of gas and repair liquid, even if there is residual gas, such as trace sulfur hexafluoride gas, it has better insulation performance and can improve the reliability of cables. At the same time, the restoration cost can be reduced by recovering the restoration liquid.

Specifically, the restoration liquid injection unit further includes one or more of an air pressure sensor, a flow rate sensor, a gas sensor, and an acoustic sensor.

It should be noted that the air pressure sensor can detect air pressure, flow rate and vibration signal, and can have the alarm function of low air pressure at regular intervals, that is, when the received air pressure is lower than the set value after a certain period of time, an audible and visual alarm function is provided; The gas sensor and the acoustic sensor detect and alarm the gas leaked through the gaps and holes through patrolling to detect the part of the cable laid and installed, so as to realize the location of the leak point. Specifically, the monitoring collection system also includes a communication module, which manages the monitoring data through a wired or wireless mode. The monitoring and acquisition system can also test the impedance spectrum of the cable, including the impedance modulus spectrum and the impedance angle spectrum, and calculate the gain of local aging, regularly compare the change of local aging gain, and compare the overall impedance spectrum or phase spectrum. Changes to track global and local aging during restoration.

Specifically, the monitoring unit also includes a coupling injection sensor and a feedback current sensor, which can realize online live monitoring and repair.

A cable aging treatment device pre-treats and removes the water inside the cable to be tested through an inflatable system during the aging repair process of the cable to be tested, so as to ensure that the repair liquid can effectively fill the aging area. The calculated length L1 of the tested cable is obtained by monitoring, and the change of said L1 can judge the repair degree of the aging treatment cable. The closer the value of L1 is to L0, the closer the repair is to completion. During the monitoring process, the high-frequency heating element gives the tested The capacitive insulating layer of the cable is heated, the heating of the capacitive insulating layer is uniform, and the activity of the internal water molecules is increased, which is conducive to the chemical neutralization of the repairing liquid and micro water, which improves the repairing precision of the repairing liquid, and the flow rate in the cable be improved, thereby improving the repair efficiency.

Example 3

A method for cable aging management and monitoring, the method includes aging assessment, capable of evaluating the aging situation of cables, including the following steps:

S1: Assembling the cable to be tested with a fixed-length standard cable to form a tested cable, the standard cable has a stable dielectric constant and length;

S2: The output signal source of the DDS signal generator passes through the power amplifier and then passes through the tested cable;

S3: Obtain the calculated length L1 of the tested cable through the frequency domain analysis method of impedance spectrum or phase spectrum;

S4: Comparing the calculated length L1 of the tested cable with the actual length L0 of the tested cable, judge whether the cable is aging or judge the degree of cable aging: when L1=L0, the aging control cable does not appear aging phenomenon, when L1< At L0, the aging treatment cable has already experienced aging phenomenon, and the smaller L1 is, the more serious the aging phenomenon is.

The cable to be tested is a 10kV XLPE cable with a known length of 400 meters. According to the 400 meters of the cable to be tested and the 100 meters of the standard cable, the actual total length of the cable to be tested is 500 meters (L0), which is obtained by the following method Calculated length L1 of the tested cable:

The starting point of the transmission frequency of the DDS signal generator is 100kHz, the step value is 50kHz, and the number of sweeping points is 1000. The signal is collected through the signal acquisition system and fed back to the central controller to calculate the calculated length L1 of the tested cable as 495 meters.

L1 is less than L0, indicating that there is an aging area in the cable to be tested. Since more than 90% of the cables are prematurely aged and water is related, the water content in the cable to be tested can be calculated through the relationship of length:

Water content=(L0-L1)/L0×100%

It should be noted that, in actual operation, the length of the cable laid on site is unknown, and usually there is a large error. Therefore, the present invention fully considers the test under the condition of unknown cable length. Provide a standard cable with an accurate length of 100 meters as a part of the tested cable, pass the same impedance sweep test, and finally obtain a cable length of 97 meters through the frequency domain positioning method, and compare the 97-meter cable with the 100-meter cable Compare to obtain a rough dielectric constant or variation.

It can be seen that it is a very reliable and economical method to evaluate the cable aging value by calculating the length change of the standard cable and the tested cable.

Example 4

A kind of cable aging management method comprises the steps:

A1: Aging assessment, judging whether the aging treatment cable needs to be repaired through the aging assessment of the cable aging treatment monitoring method;

As described in Example 3, if L1<L0, the test cable is aging and needs to be repaired.

A2: Aging location, through the cable aging control monitoring method, move the test position of the aging control cable, find the area with a large change value in the L1, which is the aging area;

According to the area of the burn-in area obtained in step A2, select the injection end of the repair fluid. If the burn-in area is close to the current test end, then only connect the repair device for repair; if the burn-in area is close to the end of the cable to be tested, select the end. Inject repair fluid. This solution can greatly improve the repair efficiency, especially when the cable is very long, the overall aging is not obvious, but when the local aging is serious, only a partial repair is required, which can save repair fluid.

A3: Monitoring and repairing. Drill holes at the front and rear ends of the aging area or add terminals to contact the metal layer or the armor layer, inject repair liquid to eliminate moisture and fill the deterioration gap. The repair process can be monitored through cable aging management The method starts periodically or monitors the repair degree in real time until the repair is completed;

Since the cable frequency domain positioning method can also provide continuous state information at any position of the cable, for a position with a large water content in a certain area, a large mutation point will appear. Therefore, in combination with the aging treatment of the present invention, the chemical solution can be injected The cable body is repaired. During this process, the frequency domain positioning method can continue to be used for monitoring. For example, after the chemical liquid enters the location of the mutation point, the intensity information presented by the mutation point will gradually weaken as the repair process proceeds, thus The process of effective and active monitoring of aging repair is realized. By observing the change of the total length of the cable, the improvement of the aging state of the entire cable can be observed, for example, the length of 495 meters is gradually approaching the length of 500 meters.

A4: Insulation sealed.

It should be noted that during the monitoring and repairing process, since the DDS continuously outputs high-frequency signals, the capacitive insulation layer of the cable generates a capacitive current, which plays a role in optimizing the repair. On the one hand, the capacitive current makes the capacitive layer play a heating role, and the heating is beneficial to the flow of the chemical liquid. On the other hand, under the electric field structure, the chemical liquid can better penetrate the capacitive layer. Of course, the repair process is relatively slow, so the monitoring process can be real-time or scheduled, such as monitoring once every 20 minutes. If it is necessary to continue heating during the repair process, the impedance spectrum test and calculation of cable aging can be carried out, and the output of a single frequency point, such as the continuous output of 100kHz signal, can be carried out to play a heating role.

Since in Embodiment 2, the entire hardware structure can realize digital control, the above process can be completed through computer programs.

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 modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a method for cable aging management monitoring, is characterized in that, described method comprises aging evaluation, can evaluate the aging situation of cable, comprises the steps: S1: Assembling the cable to be tested with a fixed-length standard cable to form a tested cable, the standard cable has a stable dielectric constant and length; S2: The output signal source of the DDS signal generator passes through the power amplifier and then passes through the tested cable; S3: Obtain the calculated length L1 of the tested cable through the frequency domain analysis method of impedance spectrum or phase spectrum or the time domain reflection method including power energy; S4: Comparing the calculated length L1 of the tested cable with the actual length L0 of the tested cable, judge whether the cable is aging or judge the degree of cable aging: when L1=L0, the aging control cable does not appear aging phenomenon, when L1< At L0, the aging treatment cable has already experienced aging phenomenon, and the smaller L1 is, the more serious the aging phenomenon is. 2. The method for a kind of cable aging management monitoring according to claim 1, characterized in that, in the cable repair process, the step S3 can be started regularly or monitored in real time to obtain the calculated length L1 of the tested cable, and the calculated length L1 of the L1 The change can determine the repair degree of the aging treatment cable, and the closer the value of L1 is to L0, the closer the repair is to completion. 3. A cable aging management method applying the method described in claim 1 or 2, is characterized in that, said cable aging management method comprises the steps: A1: judge whether the aging management cable needs to be repaired through the aging assessment; A2: Aging location, move the test position of the aging control cable, and find the area with a large change value in the L1, which is the aging area; A3: Monitoring and repairing. Drill holes at the front and rear ends of the aging area or add terminals to contact the metal layer or the armor layer, inject repair liquid to eliminate moisture and fill the deterioration gap. The repair process can be started regularly or monitored in real time. extent until the restoration is completed; A4: Insulation sealed. 4. The cable aging treatment method according to claim 3, characterized in that, in the step A3, before injecting the repair liquid, the input gas is charged for a certain period of time, and the input gas includes pure air, helium, SF6 One or more of gases, argon, and gases containing hydrophilic chemicals. 5. The cable aging treatment method according to claim 3, wherein the repair liquid is insulating oil, organic silicon, phenylmethyldialkoxysilane (PhMeSi(OR) ₂ ), phenylmethyl One or more of dimethoxysilane (PhMeSi(OMe) ₂ ), titanium dioxide, silicone rubber fluid, siloxane, hydrophobic silica fluid, and superhydrophobic silica fluid. 6. The cable aging treatment method according to claim 3, characterized in that, in the A3: monitoring and repairing step, current is passed through the cable core to generate heat and an electric field to heat the insulating layer. 7. A monitoring device applying the method described in claim 1 or 2 comprises: a central controller, a monitoring unit, a tested cable; the monitoring unit comprises a signal acquisition system, a DDS signal generator, a power amplifier; the central control unit The devices are respectively connected to the signal acquisition system and the DDS signal generator; the DDS signal generator is connected to the power amplifier, and the tested cables are respectively connected to the signal acquisition system and the power amplifier. 8. The cable aging management monitoring device according to claim 7, characterized in that, the output of the power amplifier and the acquisition system can be single-channel, that is, single-core cable monitoring, or multi-channel, and can be used for three-phase or Monitoring of polyphase cables. 9. A cable aging management device applying the method according to claim 3, characterized in that said device comprises: Central controller, tested cable; The monitoring unit of claim 7; High frequency heating element; Inflatable unit: contains relays and compressors connected in sequence; Restoration liquid injection unit: includes repair liquid injection pumps, injection valves, flow monitors, and multi-phase synchronous valves connected in sequence; The central controller is respectively connected to the monitoring unit and the inflation unit; the tested cable is respectively connected to the monitoring unit, the high-frequency heating element, and the repair liquid injection unit; The power amplifier is connected to the high-frequency heating element; The relay is connected with the central controller, the compressor is connected with the repair liquid injection pump, and the multi-phase synchronous valve is connected with the cable to be tested. 10. The cable aging treatment device according to claim 9, characterized in that the device further comprises a negative pressure unit.