CN103163561A

CN103163561A - Cable path electriferous probing method and device

Info

Publication number: CN103163561A
Application number: CN2013100979652A
Authority: CN
Inventors: 崔浩; 葛忠梁; 卢燕; 陆遥; 严倩倩; 陈晓峰
Original assignee: SHANGHAI TIEXIN GEOGRAPHY INFORMATION CO Ltd; State Grid Corp of China SGCC; Shanghai Municipal Electric Power Co
Current assignee: SHANGHAI TIEXIN GEOGRAPHY INFORMATION CO Ltd; State Grid Corp of China SGCC; Shanghai Municipal Electric Power Co
Priority date: 2013-03-25
Filing date: 2013-03-25
Publication date: 2013-06-19

Abstract

The invention relates to a method and device for live detection of a cable path. The method includes the following steps: placing a clamp on the ground part of the cable to be tested; a transmitter emits a detection signal, and the detection signal is induced to the cable to be tested through the clamp. In the formation where the underground part of the cable is located; the receiver receives the secondary magnetic field signal of the induced current in the cable to be tested on the ground, and determines the cable path according to the strength of the secondary magnetic field signal; the device includes a transmitter, a receiver and a Pomo alloy clamp, the permalloy clamp is a closed ring clamp, which is sleeved on the ground part of the cable to be tested, and the signal input end of the permalloy clamp is connected to the transmitter. Compared with the prior art, the invention has the advantages of good detection accuracy and high efficiency.

Description

The charged detection method of a kind of cable trace and device

Technical field

The present invention relates to a kind of cable trace Detection Techniques, especially relate to a kind of charged detection method of pahtfinder hard and device that is applicable to low-voltage cable.

Background technology

Lv power cable is the cable machinery of the minimum rated voltage of system of State Grid Corporation of China.At present, most of lv power cable is in the nerve endings of electrical network, and equipment Management Level distance high-voltage power cable standardized management gap is larger.Be in particular in the following aspects:

1, equipment near-end cable termination and the distance terminal inconsistent phenomenon ratio of listing is high.The situation of confusing cable according to the existing nameplate of equipment happens occasionally, and the inaccurate ratio of equipment nameplate of especially same bus double cable is higher.

2, the ratio of cable machinery path profile disappearance is high.Because low pressure 380V number of cables is various, possessing Pyatyi, to take up the unit of construction quality many, and electric company's span of management is excessive, and during the low-voltage cable asset handover, run unit is considerably less with the equipment ratio of complete cable trace figure.

3, the ratio of cable machinery joint location figure disappearance is high.Cable splice is the weakest link of cable system, and the cable splice location drawing is the pacing items of quick pinpoint low-voltage cable fault.Because the attention degree to low-voltage cable equipment was not high in the past, run unit is not strict to the management expectancy of low-voltage cable as-constructed drawing and the cable splice location drawing, forms actual disappearance, to cable trace generaI investigation and the very large obstruction of cable fault location formation.

Because the Underground Pipeline Archives data is inaccurate, incomplete, imperfect, discrete, form is various, the data standard disunity, cause information to utilize difficulty, degree of share low, even cause the engineering accident phenomenon to happen occasionally, how improving underground pipeline information quality of achievement monitoring security mechanism is one of the outstanding problem that need to solve as early as possible.During existing Underground Pipeline General Survey was surveyed, due to factors such as complex geologic conditions, environmental difference are large, a large amount of uses of non-metal pipe and the large buried pipeline of non-excavation increase gradually, the accuracy and efficiency of detection had much room for improvement.

Summary of the invention

Purpose of the present invention is exactly to provide the cable trace that a kind of detection accuracy is good, efficient is high charged detection method for the defective that overcomes above-mentioned prior art existence.

Purpose of the present invention can be achieved through the following technical solutions:

The charged detection method of a kind of cable trace, the method comprises the following steps:

1) clamp is set in the aerial part of cable under test;

2) transmitter emission detection signal is induced to detectable signal in the stratum at cable under test under ground portion place by clamp;

3) receiver receives faradic secondary magnetic field signal in cable under test on the ground, determines cable trace according to the intensity of secondary magnetic field signal.

Described clamp adopts the annular permalloy clamp of closed type.

The frequency range of the detectable signal of described transmitter is 491Hz～83kHz.

The optimized frequency of the detectable signal of described transmitter is 8.192kHz, 8.44kHz, 9.82kHz, 32.8kHz, 82kHz or 83kHz.

Described transmitter can connect a plurality of clamps, launches simultaneously the different frequency detectable signal to many cable under test, surveys when carrying out the multiway cable path.

A kind of cable trace band electric detection device for implementing said method, comprise transmitter for generation of detectable signal, be used for receiving receiver and the permalloy clamp of detectable signal, described permalloy clamp is the annular clamp of closed type, be set in the aerial part of cable under test, the signal input part of permalloy clamp connects transmitter.

Described transmitter is provided with a plurality of detectable signal output terminals, and each signal output part has been connected respectively a permalloy clamp, detectable signal is induced in the stratum at cable under test under ground portion place.

Each detectable signal output terminal correspondence is signal generating circuit independently, produces the detectable signal of different frequency.

Also be provided with wireless communication module on described transmitter and receiver, by this wireless communication module, the real-time condition of detection process uploaded.

Compared with prior art, the present invention is by adopting the annular permalloy clamp of closed type, to reach the purpose of hot line job, can also carry out simultaneously multiplexed detection by a plurality of clamps are set, improve the efficient that the path is surveyed, in addition, by adopting preferred detectable signal frequency, a little less than making the power frequency interference of cable, detection accuracy is good.

Description of drawings

Fig. 1 is process flow diagram of the present invention;

The structural representation of Fig. 2 device of the present invention.

Embodiment

The present invention is described in detail below in conjunction with the drawings and specific embodiments.

Embodiment

As shown in Figure 1, the charged detection method of a kind of cable trace, the concrete steps that the method is surveyed the 380V low-voltage cable comprise:

Step 1 is set in clamp the aerial part of cable under test.Herein, clamp adopts the annular permalloy clamp of closed type, can carry out hot line job, and because permalloy has very high low-intensity magnetic field magnetoconductivity, and adopt the loop configuration of complete closure form, receiver can well detectable signal be induced to the stratum at cable under test under ground portion place, so that can receive faradic secondary magnetic field signal in cable under test preferably.Its performance is compared with common clamp, has obvious advantage, and is specifically as shown in table 1.

Table 1

Step 2, transmitter emission detection signal, detectable signal is induced in the stratum at cable under test under ground portion place by clamp, the frequency of its emission gets final product in 491Hz～83kHz scope, preferably can be preferably 8.192kHz, 8.44kHz, 9.82kHz, 32.8kHz, 82kHz or 83kHz, these frequencies are suitable frequencies of low-voltage electric cable trace location, can effectively reduce power frequency and disturb.

Step 3, receiver receive faradic secondary magnetic field signal in cable under test on the ground, determine cable trace according to the intensity of secondary magnetic field signal.

The method can be implemented by device as shown in Figure 2, and this device comprises transmitter 1, receiver 2 and permalloy clamp 3.wherein, transmitter 1 is used for producing detectable signal, permalloy clamp 3 adopts the annular clamp of closed type, be set in the aerial part of cable under test 4, the signal input part of permalloy clamp 3 connects the signal output part of transmitter 1, receive the detectable signal that produces, and with induction of signal to the stratum at cable under test 4 under ground portion places, because permalloy has very high low-intensity magnetic field magnetoconductivity, and adopt the loop configuration of complete closure form, can well detectable signal be induced to the stratum at cable under test under ground portion place, so that receiver 2 can receive faradic secondary magnetic field signal in cable under test preferably, carry out the accurate location of cable trace, its locating effect is compared with common clamp, has obvious advantage.

In order to improve the efficient of detection, transmitter 1 is provided with a plurality of detectable signal output terminals, and correspondence signal generating circuit independently, can produce the detectable signal of different frequency.Be connected respectively a permalloy clamp 3 at each signal output part, carried out simultaneously multiplexed detection.In addition, on transmitter 1 and receiver 2, wireless communication module 5 is set also, by this wireless communication module, the real-time condition of detection process is uploaded, can grasp at any time to survey with the personnel that conveniently are positioned at remote monitoring center and carry out, obtain result of detection.

Claims

1. A cable path live detection method is characterized in that the method may further comprise the steps:

1) Set the clamp on the ground part of the cable to be tested;

2) The transmitter emits a detection signal, and the detection signal is induced to the formation where the underground part of the cable to be tested is located through the clamp;

3) The receiver receives the secondary magnetic field signal of the induced current in the cable to be tested on the ground, and determines the cable path according to the strength of the secondary magnetic field signal.

2 . The live detection method for a cable path according to claim 1 , wherein the clamp is a closed annular permalloy clamp. 3 .

3 . The live detection method of a cable path according to claim 1 , wherein the detection signal of the transmitter has a frequency range of 491 Hz to 83 kHz. 4 .

4. A cable path live detection method according to claim 3, wherein the preferred frequency of the detection signal of the transmitter is 8.192kHz, 8.44kHz, 9.82kHz, 32.8kHz, 82kHz or 83kHz.

5. A live detection method for a cable path according to claim 3, wherein the transmitter can be connected to a plurality of clamps, and simultaneously transmit detection signals of different frequencies to a plurality of cables to be tested to perform multi-channel cable detection. Simultaneous detection of paths.

6. A cable path live detection device for implementing the method according to claim 1, comprising a transmitter for generating a detection signal, a receiver for receiving the detection signal and a permalloy clamp, The permalloy clamp is a closed ring clamp, which is sleeved on the ground part of the cable to be tested, and the signal input end of the permalloy clamp is connected to the transmitter.

7. The cable path live detection device according to claim 6, wherein the transmitter is provided with a plurality of detection signal output terminals, and each signal output terminal is correspondingly connected with a permalloy clamp respectively, and the The detection signal is induced into the formation where the underground part of the cable to be tested is located.

8 . The cable path live detection device according to claim 7 , wherein each detection signal output terminal corresponds to an independent signal generating circuit to generate detection signals of different frequencies.

9. The cable path live detection device according to claim 6, characterized in that, the transmitter and the receiver are also provided with a wireless communication module, and the real-time situation of the detection process is uploaded through the wireless communication module.