阅读说明：本技术 一种环网柜电缆接头状态判别的方法 (Method for discriminating cable joint state of ring main unit ) 是由 尚淑宁 刘长华 陈金 商琼玲 梁广生 肖蔚 农谢 潘冬秋 陈霄 于 2021-07-13 设计创作，主要内容包括：本发明公开了一种环网柜电缆接头状态判别方法,包括以下步骤：数据采集终端采集电缆接头电流信号和温度信号,并发送至监测终端；所述监测终端接收数据采集终端发送的电流信号和温度信号,并在电流-温度数据库中搜索相同的电流信号；将采集的温度信号与搜索相同的电流信号对应的温度信号进行温度信号差值计算；在单位时间内,若所述温度信号差值连续小于第一温度差值阈值,判别为正常；所述监测终端显示电缆接头温度信号差值正常。实现对环网柜电缆接头的温度状态进行判别,从而达到及时预警,防止电力事故的发生。(The invention discloses a ring main unit cable joint state distinguishing method, which comprises the following steps: the data acquisition terminal acquires a cable joint current signal and a temperature signal and sends the signals to the monitoring terminal; the monitoring terminal receives the current signal and the temperature signal sent by the data acquisition terminal and searches the same current signal in a current-temperature database; carrying out temperature signal difference calculation on the acquired temperature signal and the temperature signal corresponding to the searched same current signal; in unit time, if the temperature signal difference value is continuously smaller than a first temperature difference value threshold value, judging that the temperature signal difference value is normal; and the monitoring terminal displays that the temperature signal difference of the cable joint is normal. The temperature state of the cable joint of the ring main unit is judged, so that timely early warning is achieved, and power accidents are prevented.)

1. A ring main unit cable joint state distinguishing method is characterized by comprising the following steps:

s101, a data acquisition terminal acquires a cable joint current signal and a temperature signal and sends the signals to a monitoring terminal;

s102, the monitoring terminal receives a current signal and a temperature signal sent by the data acquisition terminal, and searches the same current signal in a current-temperature database;

s103, calculating the temperature signal difference value of the acquired temperature signal and the temperature signal corresponding to the searched same current signal;

s104, judging the temperature signal difference value to be normal if the temperature signal difference value is continuously smaller than a first temperature difference value threshold value in unit time;

and S105, displaying that the temperature signal difference of the cable joint is normal by the monitoring terminal.

2. The method for determining the cable joint status of the ring main unit according to claim 1, wherein in unit time, if the temperature signal difference value is continuously greater than or equal to a first temperature difference value threshold and less than a second temperature difference value threshold, and is determined to be slightly abnormal, the following steps are performed:

and S106, the monitoring terminal displays that the difference value of the temperature signals of the cable joint is slightly abnormal.

3. The method for determining the cable joint status of the ring main unit according to claim 1, wherein in unit time, if the temperature signal difference value is continuously greater than or equal to the second temperature difference value threshold value, it is determined that the abnormal condition is serious, the following steps are performed:

and S107, the monitoring terminal displays that the difference value of the temperature signals of the cable joint is very serious and abnormal.

4. The method for determining the cable joint status of the ring main unit according to claim 1, wherein in unit time, if the temperature signal difference is discontinuous and greater than or equal to a second temperature difference threshold, it is determined that the temperature signal difference is seriously abnormal, the following steps are performed:

and S108, the monitoring terminal displays that the difference value of the temperature signals of the cable joint is seriously abnormal.

5. The ring main unit cable joint state discrimination method as claimed in claim 1, wherein the data acquisition terminal acquires a one-to-one correspondence between the current signal and the temperature signal of the cable joint.

Technical Field

The invention relates to the field of power information, in particular to a ring main unit cable joint state distinguishing method.

Background

The number of the power ring main units is large, the distribution range is wide, the power ring main units are important components and control contacts of an urban power supply network, and the running state of the ring main units is directly related to the reliability of an urban power supply system. The cable joint is an important component of the ring main unit, and the temperature state of the ring main unit joint is a key index for measuring whether the ring main unit operates normally. Because of the reasons such as loss, cable overload, product quality, installation irregularity in electrical equipment can lead to cable joint to produce the phenomenon of discharging, overheated, fail to carry out effectual evaluation to cable joint's temperature state, if cable joint's temperature is too high, lead to insulating properties to descend easily, damage etc. and then cause the electric power accident, influence normal power supply.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a method for judging the state of a cable joint of a ring main unit, which realizes the judgment of the temperature state of the cable joint of the ring main unit.

In order to achieve the purpose, the invention adopts the following technical scheme:

s101, a data acquisition terminal acquires a cable joint current signal and a temperature signal and sends the signals to a monitoring terminal;

s102, the monitoring terminal receives a current signal and a temperature signal sent by the data acquisition terminal, and searches the same current signal in a current-temperature database;

s103, calculating the temperature signal difference value of the acquired temperature signal and the temperature signal corresponding to the searched same current signal;

s104, judging that the temperature signal difference is normal if the temperature signal difference is continuously smaller than a first temperature difference threshold value in unit time;

s105, displaying that the temperature signal difference value of the cable joint is normal by the monitoring terminal;

in steps S101 to S105, in a unit time, if a plurality of consecutive temperature signal differences among the first temperature signal difference, the second temperature signal difference, and the third temperature signal difference … … nth temperature signal difference are all smaller than the first temperature difference threshold, the monitoring terminal determines that the temperature is normal.

S201, a data acquisition terminal acquires a cable joint current signal and a temperature signal and sends the signals to a monitoring terminal;

s202, the monitoring terminal receives a current signal and a temperature signal sent by the data acquisition terminal, and searches the same current signal in a current-temperature database;

s203, calculating the temperature signal difference value of the collected temperature signal and the temperature signal corresponding to the searched same current signal;

s204, in unit time, if the temperature signal difference value is continuously greater than or equal to the first temperature difference value threshold and less than the second temperature difference value threshold, judging that the temperature signal difference value is slightly abnormal;

s205, the monitoring terminal displays that the difference value of the temperature signals of the cable joint is slightly abnormal;

in steps S201 to S205, in a unit time, if a plurality of consecutive temperature signal differences among the first temperature signal difference, the second temperature signal difference, and the third temperature signal difference … … nth temperature signal difference are all greater than or equal to the first temperature difference threshold and less than the second temperature difference threshold, the monitoring terminal determines that the temperature is slightly abnormal.

S301, a data acquisition terminal acquires a cable joint current signal and a temperature signal and sends the signals to a monitoring terminal;

s302, the monitoring terminal receives the current signal and the temperature signal sent by the data acquisition terminal and searches the same current signal in a current-temperature database;

s303, calculating the temperature signal difference value of the acquired temperature signal and the temperature signal corresponding to the searched same current signal;

s304, in unit time, if the temperature signal difference value is continuously larger than or equal to the second temperature difference value threshold value, judging that the abnormal condition is very serious;

s305, displaying that the difference value of the temperature signals of the cable joint is very serious and abnormal by the monitoring terminal;

in steps S301 to S305, in a unit time, if a plurality of consecutive temperature signal differences among the first temperature signal difference, the second temperature signal difference, and the third temperature signal difference … …, the nth temperature signal difference are all greater than or equal to the second temperature difference threshold, the monitoring terminal determines that the abnormality is very serious.

S401, collecting a current signal and a temperature signal of a cable joint by a data collection terminal, and sending the current signal and the temperature signal to a monitoring terminal;

s402, the monitoring terminal receives a current signal and a temperature signal sent by the data acquisition terminal, and searches the same current signal in a current-temperature database;

s403, calculating a temperature signal difference value of the acquired temperature signal and the temperature signal corresponding to the searched same current signal;

s404, in unit time, if the temperature signal difference value is discontinuous and is greater than or equal to a second temperature difference value threshold value, judging that the temperature signal difference value is serious abnormal;

s405, the monitoring terminal displays that the difference value of the temperature signals of the cable joint is seriously abnormal;

in steps S401 to S405, in a unit time, if a plurality of consecutive temperature signal differences among the first temperature signal difference, the second temperature signal difference, and the third temperature signal difference … … nth temperature signal difference are greater than or equal to the second temperature difference threshold, the monitoring terminal determines that the temperature is seriously abnormal.

Further, the data acquisition terminal acquires a first current signal, a second current signal and an Nth current signal … … of the cable joint and sends the signals to the monitoring terminal; the data acquisition terminal acquires a first temperature signal, a second temperature signal and an Nth temperature signal … … of the cable joint and sends the signals to the monitoring terminal; the first current signal corresponds to a first temperature signal, the second current signal corresponds to a second temperature signal, and the third current signal corresponds to a third temperature signal … ….

Further, the monitoring terminal receives a first current signal, a second current signal and an Nth current signal … … sent by the data acquisition terminal; the monitoring terminal receives the first temperature signal, the second temperature signal and the third temperature signal … … Nth temperature signal sent by the data acquisition terminal.

Further, the monitoring terminal searches the current-temperature database for a current signal that is the same as the first current signal, the monitoring terminal searches the current-temperature database for a current signal that is the same as the second current signal, the monitoring terminal searches the current-temperature database for a current signal that is the same as the third current signal … …, and the monitoring terminal searches the current-temperature database for a current signal that is the same as the nth current signal.

Further, the monitoring terminal searches a current signal which is the same as the first current signal in a current-temperature database, and the temperature signal difference value of the first temperature signal and the temperature signal corresponding to the current signal which is the same as the first current signal is calculated to be a first temperature signal difference value; the monitoring terminal searches a current signal which is the same as the second current signal in the current-temperature database, and the temperature signal difference value of the second temperature signal and the temperature signal corresponding to the current signal which is the same as the second current signal is calculated to be a second temperature signal difference value; the monitoring terminal searches a current signal which is the same as the third current signal in a current-temperature database, the temperature signal difference calculation is carried out on the third temperature signal and the temperature signal corresponding to the current signal which is the same as the third current signal, the current signal which is the same as the Nth current signal is searched in the current-temperature database for the third temperature signal difference … …, and the temperature signal difference calculation is carried out on the temperature signal which is the same as the current signal which is searched for the Nth current signal and the temperature signal corresponding to the current signal which is the same as the Nth current signal, and the temperature signal difference is the Nth temperature signal difference.

Further, in unit time, if a plurality of continuous temperature signal differences in the first temperature signal difference, the second temperature signal difference and the third temperature signal difference … … Nth temperature signal difference are all smaller than the first temperature difference threshold, the monitoring terminal judges that the temperature signals are normal; in unit time, if a plurality of continuous temperature signal differences in the first temperature signal difference, the second temperature signal difference and the third temperature signal difference … … Nth temperature signal difference are all larger than or equal to a first temperature difference threshold and smaller than a second temperature difference threshold, the monitoring terminal judges that the temperature is slightly abnormal; in unit time, if a plurality of continuous temperature signal differences in the first temperature signal difference, the second temperature signal difference and the third temperature signal difference … … Nth temperature signal difference are all larger than or equal to a second temperature difference threshold value, the monitoring terminal judges that the abnormality is very serious; in unit time, if a plurality of continuous temperature signal differences in the first temperature signal difference, the second temperature signal difference and the third temperature signal difference … … Nth temperature signal difference are discontinuous and are greater than or equal to the second temperature difference threshold value, the monitoring terminal judges that the temperature difference is serious abnormal.

The invention has the beneficial effects that: a cable joint state distinguishing method of a ring main unit is characterized in that a data acquisition terminal is used for acquiring a cable joint current signal and a temperature signal, temperature signal difference calculation is carried out according to a current-temperature database, and the temperature state of the cable joint of the ring main unit is distinguished, so that early warning is timely achieved, and power accidents are prevented.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram illustrating the normal procedure of the method for determining the cable joint status of a ring main unit according to the present invention;

FIG. 2 is a schematic diagram illustrating a procedure of the method for determining a cable joint status of a ring main unit according to the present invention as a slight abnormality;

FIG. 3 is a schematic diagram illustrating a very serious abnormal step of the method for determining a cable joint status of a ring main unit according to the present invention;

fig. 4 is a schematic diagram of a procedure for determining a serious abnormality in the method for determining a cable joint state of a ring main unit according to the present invention.

Detailed Description

The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

The first embodiment is as follows:

as shown in fig. 1:

s101, a data acquisition terminal acquires a cable joint current signal and a temperature signal and sends the signals to a monitoring terminal;

the data acquisition terminal acquires a first current signal, a second current signal and a third current signal … … Nth current signal of the cable joint and sends the signals to the monitoring terminal; the data acquisition terminal acquires a first temperature signal, a second temperature signal and an Nth temperature signal … … of the cable joint and sends the signals to the monitoring terminal; the first current signal corresponds to a first temperature signal, the second current signal corresponds to a second temperature signal, and the third current signal corresponds to a third temperature signal … ….

S102, the monitoring terminal receives a current signal and a temperature signal sent by the data acquisition terminal, and searches the same current signal in a current-temperature database;

the monitoring terminal receives a first current signal, a second current signal and an Nth current signal … … of a third current signal sent by the data acquisition terminal; the monitoring terminal receives a first temperature signal, a second temperature signal and an Nth temperature signal … … of a third temperature signal sent by the data acquisition terminal; the monitoring terminal searches the current-temperature database for a current signal identical to the first current signal, the monitoring terminal searches the current-temperature database for a current signal identical to the second current signal, the monitoring terminal searches the current-temperature database for a current signal identical to the third current signal … …, and the monitoring terminal searches the current-temperature database for a current signal identical to the nth current signal.

S103, calculating the temperature signal difference value of the acquired temperature signal and the temperature signal corresponding to the searched same current signal;

the monitoring terminal searches a current signal which is the same as the first current signal in a current-temperature database, and the temperature signal difference value of the first temperature signal and the temperature signal corresponding to the current signal which is the same as the first current signal is calculated to be a first temperature signal difference value; the monitoring terminal searches a current signal which is the same as the second current signal in the current-temperature database, and the temperature signal difference value of the second temperature signal and the temperature signal corresponding to the current signal which is the same as the second current signal is calculated to be a second temperature signal difference value; the monitoring terminal searches a current signal which is the same as the third current signal in a current-temperature database, the temperature signal difference calculation is carried out on the third temperature signal and the temperature signal corresponding to the current signal which is the same as the third current signal, the current signal which is the same as the Nth current signal is searched in the current-temperature database for the third temperature signal difference … …, and the temperature signal difference calculation is carried out on the temperature signal which is the same as the current signal which is searched for the Nth current signal and the temperature signal corresponding to the current signal which is the same as the Nth current signal, and the temperature signal difference is the Nth temperature signal difference.

S104, judging that the temperature signal difference is normal if the temperature signal difference is continuously smaller than a first temperature difference threshold value in unit time;

in unit time, if a plurality of continuous temperature signal differences in the first temperature signal difference, the second temperature signal difference and the third temperature signal difference … … Nth temperature signal difference are all smaller than a first temperature difference threshold value, the monitoring terminal judges that the temperature signals are normal.

S105, displaying that the temperature signal difference value of the cable joint is normal by the monitoring terminal;

and the monitoring terminal judges that the temperature signal of the cable joint is normal.

Example two:

as shown in fig. 2:

s201, a data acquisition terminal acquires a cable joint current signal and a temperature signal and sends the signals to a monitoring terminal;

the data acquisition terminal acquires a first current signal, a second current signal and a third current signal … … Nth current signal of the cable joint and sends the signals to the monitoring terminal; the data acquisition terminal acquires a first temperature signal, a second temperature signal and an Nth temperature signal … … of the cable joint and sends the signals to the monitoring terminal; the first current signal corresponds to a first temperature signal, the second current signal corresponds to a second temperature signal, and the third current signal corresponds to a third temperature signal … ….

S202, the monitoring terminal receives a current signal and a temperature signal sent by the data acquisition terminal, and searches the same current signal in a current-temperature database;

the monitoring terminal receives a first current signal, a second current signal and an Nth current signal … … of a third current signal sent by the data acquisition terminal; the monitoring terminal receives a first temperature signal, a second temperature signal and an Nth temperature signal … … of a third temperature signal sent by the data acquisition terminal; the monitoring terminal searches the current-temperature database for a current signal identical to the first current signal, the monitoring terminal searches the current-temperature database for a current signal identical to the second current signal, the monitoring terminal searches the current-temperature database for a current signal identical to the third current signal … …, and the monitoring terminal searches the current-temperature database for a current signal identical to the nth current signal.

S203, calculating the temperature signal difference value of the collected temperature signal and the temperature signal corresponding to the searched same current signal;

the monitoring terminal searches a current signal which is the same as the first current signal in a current-temperature database, and the temperature signal difference value of the first temperature signal and the temperature signal corresponding to the current signal which is the same as the first current signal is calculated to be a first temperature signal difference value; the monitoring terminal searches a current signal which is the same as the second current signal in the current-temperature database, and the temperature signal difference value of the second temperature signal and the temperature signal corresponding to the current signal which is the same as the second current signal is calculated to be a second temperature signal difference value; the monitoring terminal searches a current signal which is the same as the third current signal in a current-temperature database, the temperature signal difference calculation is carried out on the third temperature signal and the temperature signal corresponding to the current signal which is the same as the third current signal, the current signal which is the same as the Nth current signal is searched in the current-temperature database for the third temperature signal difference … …, and the temperature signal difference calculation is carried out on the temperature signal which is the same as the current signal which is searched for the Nth current signal and the temperature signal corresponding to the current signal which is the same as the Nth current signal, and the temperature signal difference is the Nth temperature signal difference.

S204, in unit time, if the temperature signal difference value is continuously greater than or equal to the first temperature difference value threshold and less than the second temperature difference value threshold, judging that the temperature signal difference value is slightly abnormal;

in unit time, if a plurality of continuous temperature signal differences in the first temperature signal difference, the second temperature signal difference and the third temperature signal difference … … Nth temperature signal difference are all larger than or equal to the first temperature difference threshold and smaller than the second temperature difference threshold, the monitoring terminal judges that the temperature is slightly abnormal.

S205, the monitoring terminal displays that the difference value of the temperature signals of the cable joint is slightly abnormal;

the monitoring terminal judges that the temperature signal of the cable joint is slightly abnormal.

Example three:

as shown in fig. 3:

s301, a data acquisition terminal acquires a cable joint current signal and a temperature signal and sends the signals to a monitoring terminal;

the data acquisition terminal acquires a first current signal, a second current signal and a third current signal … … Nth current signal of the cable joint and sends the signals to the monitoring terminal; the data acquisition terminal acquires a first temperature signal, a second temperature signal and an Nth temperature signal … … of the cable joint and sends the signals to the monitoring terminal; the first current signal corresponds to a first temperature signal, the second current signal corresponds to a second temperature signal, and the third current signal corresponds to a third temperature signal … ….

S302, the monitoring terminal receives the current signal and the temperature signal sent by the data acquisition terminal and searches the same current signal in a current-temperature database;

the monitoring terminal receives a first current signal, a second current signal and an Nth current signal … … of a third current signal sent by the data acquisition terminal; the monitoring terminal receives a first temperature signal, a second temperature signal and an Nth temperature signal … … of a third temperature signal sent by the data acquisition terminal; the monitoring terminal searches the current-temperature database for a current signal identical to the first current signal, the monitoring terminal searches the current-temperature database for a current signal identical to the second current signal, the monitoring terminal searches the current-temperature database for a current signal identical to the third current signal … …, and the monitoring terminal searches the current-temperature database for a current signal identical to the nth current signal.

S303, calculating the temperature signal difference value of the acquired temperature signal and the temperature signal corresponding to the searched same current signal;

the monitoring terminal searches a current signal which is the same as the first current signal in a current-temperature database, and the temperature signal difference value of the first temperature signal and the temperature signal corresponding to the current signal which is the same as the first current signal is calculated to be a first temperature signal difference value; the monitoring terminal searches a current signal which is the same as the second current signal in the current-temperature database, and the temperature signal difference value of the second temperature signal and the temperature signal corresponding to the current signal which is the same as the second current signal is calculated to be a second temperature signal difference value; the monitoring terminal searches a current signal which is the same as the third current signal in a current-temperature database, the temperature signal difference calculation is carried out on the third temperature signal and the temperature signal corresponding to the current signal which is the same as the third current signal, the current signal which is the same as the Nth current signal is searched in the current-temperature database for the third temperature signal difference … …, and the temperature signal difference calculation is carried out on the temperature signal which is the same as the current signal which is searched for the Nth current signal and the temperature signal corresponding to the current signal which is the same as the Nth current signal, and the temperature signal difference is the Nth temperature signal difference.

S304, in unit time, if the temperature signal difference value is continuously larger than or equal to the second temperature difference value threshold value, judging that the abnormal condition is very serious;

in unit time, if a plurality of continuous temperature signal differences in the first temperature signal difference, the second temperature signal difference and the third temperature signal difference … … Nth temperature signal difference are all larger than or equal to the second temperature difference threshold value, the monitoring terminal judges that the abnormality is very serious.

S305, displaying that the difference value of the temperature signals of the cable joint is very serious and abnormal by the monitoring terminal;

and the monitoring terminal judges that the temperature signal of the cable joint is very serious abnormal.

Example four:

as shown in fig. 4:

s401, collecting a current signal and a temperature signal of a cable joint by a data collection terminal, and sending the current signal and the temperature signal to a monitoring terminal;

the data acquisition terminal acquires a first current signal, a second current signal and a third current signal … … Nth current signal of the cable joint and sends the signals to the monitoring terminal; the data acquisition terminal acquires a first temperature signal, a second temperature signal and an Nth temperature signal … … of the cable joint and sends the signals to the monitoring terminal; the first current signal corresponds to a first temperature signal, the second current signal corresponds to a second temperature signal, and the third current signal corresponds to a third temperature signal … ….

S402, the monitoring terminal receives a current signal and a temperature signal sent by the data acquisition terminal, and searches the same current signal in a current-temperature database;

the monitoring terminal receives a first current signal, a second current signal and an Nth current signal … … of a third current signal sent by the data acquisition terminal; the monitoring terminal receives a first temperature signal, a second temperature signal and an Nth temperature signal … … of a third temperature signal sent by the data acquisition terminal; the monitoring terminal searches the current-temperature database for a current signal identical to the first current signal, the monitoring terminal searches the current-temperature database for a current signal identical to the second current signal, the monitoring terminal searches the current-temperature database for a current signal identical to the third current signal … …, and the monitoring terminal searches the current-temperature database for a current signal identical to the nth current signal.

S403, calculating a temperature signal difference value of the acquired temperature signal and the temperature signal corresponding to the searched same current signal;

the monitoring terminal searches a current signal which is the same as the first current signal in a current-temperature database, and the temperature signal difference value of the first temperature signal and the temperature signal corresponding to the current signal which is the same as the first current signal is calculated to be a first temperature signal difference value; the monitoring terminal searches a current signal which is the same as the second current signal in the current-temperature database, and the temperature signal difference value of the second temperature signal and the temperature signal corresponding to the current signal which is the same as the second current signal is calculated to be a second temperature signal difference value; the monitoring terminal searches a current signal which is the same as the third current signal in a current-temperature database, the temperature signal difference calculation is carried out on the third temperature signal and the temperature signal corresponding to the current signal which is the same as the third current signal, the current signal which is the same as the Nth current signal is searched in the current-temperature database for the third temperature signal difference … …, and the temperature signal difference calculation is carried out on the temperature signal which is the same as the current signal which is searched for the Nth current signal and the temperature signal corresponding to the current signal which is the same as the Nth current signal, and the temperature signal difference is the Nth temperature signal difference.

S404, in unit time, if the temperature signal difference value is discontinuous and is greater than or equal to a second temperature difference value threshold value, judging that the temperature signal difference value is serious abnormal;

in unit time, if a plurality of continuous temperature signal differences in the first temperature signal difference, the second temperature signal difference and the third temperature signal difference … … Nth temperature signal difference are discontinuous and are greater than or equal to the second temperature difference threshold value, the monitoring terminal judges that the temperature difference is serious abnormal.

S405, the monitoring terminal displays that the difference value of the temperature signals of the cable joint is seriously abnormal;

the monitoring terminal judges that the temperature signal of the cable joint is seriously abnormal, and the monitoring terminal displays that the temperature signal of the cable joint is seriously abnormal.

In the description of the present invention, it should be noted that the terms "first", "second", "third" and "nth" are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.

The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.