CN102879716A - Method and device for monitoring main insulation of three phases of cables under intersection and interconnection of metal protective layers on line - Google Patents
Method and device for monitoring main insulation of three phases of cables under intersection and interconnection of metal protective layers on line Download PDFInfo
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- CN102879716A CN102879716A CN2012103585179A CN201210358517A CN102879716A CN 102879716 A CN102879716 A CN 102879716A CN 2012103585179 A CN2012103585179 A CN 2012103585179A CN 201210358517 A CN201210358517 A CN 201210358517A CN 102879716 A CN102879716 A CN 102879716A
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Abstract
The invention discloses a method and a device for monitoring main insulation of three phases of cables under intersection and interconnection of metal protective layers on line, relates to a method and a device for monitoring the main insulation of the three phases of cables on line, and aims to solve the problem that the conventional method and the conventional device cannot be used for monitoring the insulation performance of the three phases of cables under intersection and interconnection of the metal protective layers on line. Current flowing through wire cores at two ends of each phase of cable is measured by using two current transformers; a difference value is calculated, so that a current value flowing through the main insulation of the cable is obtained; due to measurement for three phases of voltage by a voltage transformer, a dielectric loss factor of the main insulation of each phase of cable can be monitored on line; and therefore, the main insulation of the three phases of cables can be monitored on line. A plurality of paths of synchronous analog/digital conversion chips at two ends are controlled to perform synchronous sampling through a global positioning system (GPS) satellite synchronous signal, and calculation is performed in a computer, so that the main insulation of the three phases of cables under intersection and interconnection of the metal protective layers can be monitored on line. The method and the device are suitable for on-line monitoring of the insulation performance of the three phases of cables under intersection and interconnection of the metal protective layers.
Description
Technical field
The present invention relates to a kind of on-line monitoring method and device of threephase cable major insulation.
Background technology
The metal sheath of the threephase cable of long distance all needs to carry out cross interconnected, and purpose is to eliminate the induced voltage between the threephase cable, but this mutual contact mode has brought great difficulty to on-line monitoring technique.At present, also can't be to the on-line monitoring that carries out of the cross interconnected lower threephase cable insulating property of metal sheath.
Summary of the invention
The present invention can't carry out the problem of on-line monitoring to the cross interconnected lower threephase cable major insulation of metal sheath in order to solve at present, thereby proposes on-line monitoring method and the device of the cross interconnected lower threephase cable major insulation of a kind of metal sheath.
The on-line monitoring method of the cross interconnected lower threephase cable major insulation of metal sheath, it is realized by following methods:
Two end at threephase cable access respectively electric current, voltage transformer (VT); And by the synchronous pps pulse per second signal that gps system provides, producing synchronous sampling signal, the control A/D converter begins voltage signal and the current signal at threephase cable two ends are carried out synchronous acquisition;
It is poor that the current signal at the every phase cable two ends that obtain according to the synchronization collection is done, and obtains the leakage current of this phase cable;
According to the leakage current of every phase cable and the complementary angle of the phase difference of voltage at these phase cable two ends of synchronization collection acquisition, obtain the dielectric loss angle of threephase cable, finally obtain the dielectric dissipation factor of threephase cable; Thereby realize the on-line monitoring of the cross interconnected lower threephase cable insulating property of metal sheath.
The method that gathers the current signal at threephase cable two ends is:
Adopt current transformer to gather the current value of every phase cable end, convert analog voltage signal with gathering the current analog signal that obtains to by the I-V change-over circuit;
Adopt mould/number conversion circuit to convert this analog voltage signal to digital signal.
The method that gathers the voltage signal at threephase cable two ends is:
Adopt voltage transformer (VT) to gather the magnitude of voltage of every phase cable end, carry out adopting mould/number conversion circuit to convert this analog voltage signal to digital signal after the scaled down with gathering the voltage analog signal that obtains.
Method take the gps satellite synchronous clock as foundation as: described mould/number conversion circuit adopts synchronous mould/number conversion circuit, and adopts the gps satellite synchronous clock as the conversion and control clock of this mould/number conversion circuit, and then realizes synchronous acquisition and the conversion of data.
The digital signal that the current signal that gathers converts the digital signal of acquisition to and the voltage signal conversion that gathers obtains realizes data transmission by the mode of GPRS wireless transmission respectively.
The on-Line Monitor Device of the cross interconnected lower threephase cable major insulation of metal sheath, this device comprise three pairs of current transformers, three pairs of voltage transformer (VT), two three road I-V change-over circuits, two six tunnel synchronous mould/number conversion circuit and CPU (central processing unit); Wherein said two three road I-V change-over circuits lay respectively at the two ends of tested threephase cable, and described two six tunnel synchronous mould/number conversion circuit lay respectively at the two ends of tested threephase cable;
Every pair of current transformer is used for detecting respectively the current signal at phase cable two ends;
Every pair of voltage transformer (VT) is used for detecting respectively the voltage signal at phase cable two ends;
The current signal output end that is positioned at three current transformers of threephase cable one end connects respectively three current signal input ends of three road I-V change-over circuits that are positioned at this end, and three analog voltage signal output terminals of this three road I-V change-over circuit connect respectively three input end of analog signal of the synchronous mould that is positioned at this end/number conversion circuit; The change over clock of this synchronous mould/number conversion circuit is the gps satellite synchronous clock;
The voltage signal output end that is positioned at three voltage transformer (VT) of threephase cable one end connects respectively three input end of analog signal of the synchronous mould that is positioned at this end/number conversion circuit; The change over clock source of this synchronous mould/number conversion circuit is the gps satellite synchronous clock source;
The digital signal output end of two six tunnel synchronous mould/number conversion circuit is connected respectively data input pin and is connected with CPU (central processing unit), described CPU (central processing unit) is processed six voltage signals and six current signals that the synchronization collection obtains, obtain dielectric dissipation factor, and then obtain the cross interconnected lower threephase cable insulating property of metal sheath.
The present invention adopts two CT methods, solved the on-line monitoring of threephase cable insulating property under the cross interconnected mode of metal sheath of threephase cable, the present invention passes through the measurement to the dielectric dissipation factor of threephase cable major insulation, the final on-line monitoring of realizing the threephase cable insulation.The present invention is applicable to all long-distance cables, is particularly useful for cross interconnected long-distance cable.
Description of drawings
Fig. 1 is dielectric dissipation factor on-line monitoring schematic diagram, wherein a phase of the tested cable of mark 10 expressions; Fig. 2 is the schematic equivalent circuit of threephase cable; Fig. 3 is monitoring principle synoptic diagram of the present invention.
Embodiment
Embodiment one, in conjunction with Fig. 1 to Fig. 3 this embodiment is described, the on-line monitoring method of the cross interconnected lower threephase cable major insulation of metal sheath, it is realized by following steps:
Step 1, access respectively electric current, voltage transformer (VT) in two end of threephase cable, adopt a pair of current transformer to gather the current value at every phase cable two ends, and adopt a pair of I-V conversion and holding circuit that the current value at every phase cable two ends of collecting is carried out the I-V conversion; Adopt a pair of voltage transformer (VT) to gather the magnitude of voltage at every cable two ends;
Step 2, employing a pair of Multi-path synchronous mould/number conversion circuit ADC sample to the three-phase inversion value of a pair of I-V conversion and holding circuit output respectively, obtain a pair of three-phase current sampled value; Adopt a pair of Multi-path synchronous mould/number conversion circuit ADC respectively the magnitude of voltage of every a pair of voltage transformer (VT) output carry out synchronized sampling, obtain a pair of three-phase voltage sampled value; Adopt a pair of gps satellite synchronous clock to export respectively synchronizing clock signals to a pair of Multi-path synchronous mould/number conversion circuit ADC;
Step 3, employing CPU (central processing unit) receive three-phase current sampled value and the three-phase voltage sampled value of a pair of Multi-path synchronous mould/number conversion circuit ADC output, and the current sampling data at every phase cable two ends is done poor, the leakage current of every phase cable is flow through in acquisition, then according to the voltage sample value at every phase cable two ends, Flow is crossed the leakage current of every phase cable and the complementary angle of this phase voltage phase angle difference, and then the dielectric loss angle of acquisition threephase cable, finally obtain dielectric dissipation factor; According to the cross interconnected lower threephase cable insulating property of described dielectric dissipation factor assessment metal sheath, thus the on-line monitoring of the cross interconnected lower threephase cable insulating property of realization metal sheath.
The three-phase current sampled value and the three-phase voltage sampled value that adopt CPU (central processing unit) to receive a pair of Multi-path synchronous mould/number conversion circuit ADC output in the step 3 all realize by the mode of GPRS wireless transmission.
What the present invention used is that dielectric loss loss technology is carried out on-line monitoring to the threephase cable insulation status, the current signal that utilizes voltage, current transformer will be applied to the voltage on the cable and flow through cable insulation extracts, detect both phase angle differences by digital measuring device, and according to measured phase angle difference and the relation between the dielectric loss angle, calculate the dielectric dissipation factor of cable major insulation, judge the aging performance of cable insulation according to the size of the dielectric dissipation factor value that obtains.
Dielectric dissipation factor on-line monitoring schematic diagram as shown in Figure 1, dielectric dissipation factor tan δ has reflected the globality defective of cable insulation, is a kind of main standard that the dielectric level of capacitive equipment is judged in present electric system.For a larger insulation system, the growth of part water tree can cause the increase of tan δ, but dispersiveness is larger, and tan δ can reflect that cable insulation makes moist, the defective such as deteriorated, and ac breakdown voltage reduces, and has equally dispersiveness.Because tan δ method is the attribute of cable itself, so can be applied on the cable of free voltage grade.When the tan of cable insulation δ can be judged to greater than 1% the time badly, table 1 has provided the normative reference of on-line monitoring tan δ.
The standard of table 1 on-line monitoring tan δ
Inventive principle: get any one of threephase cable and analyze mutually, the main electrical parameters of power cable has the effective resistance of core, inductance, insulation resistance and electric capacity, and these four parameters become the primary parameter of cable.Wave impedance, phase-shift constant, attenuation constant are called the second parameter of cable, and second parameter once calculation of parameter is tried to achieve.Fig. 2 is the cable equivalent schematic diagram, and R is the effective resistance of cable core, and L is the inductance of core, and G is the resistance of cable insulation, and C is the electric capacity of cable insulation, I
1~ I
7For flowing through the electric current of each phase.
According to Kirchhoff's current law (KCL) as can be known:
I
1=I
2+I
3
I
3=I
4+I
5
I
5=I
6+I
7
Can be got by following formula:
I
1=I
2+I
4+I
6+I
7
Get final product:
I
1-I
7=I
2+I
4+I
6
Can be got by following formula, can do difference operation according to the current value that measures in two end of cable, the difference that obtains is exactly the leakage current by cable insulation.
Two CT methods are that two terminals at cable all add current transformer, be exactly the leakage current that flows through cable major insulation by the difference between the current transformer that calculates any phase cable two ends, cooperate again the measurement of the voltage transformer (VT) at two ends, just can calculate the complementary angle of the phase angle difference of the Leakage Current that flows through cable major insulation and voltage, just obtain dielectric loss angle, further calculated dielectric dissipation factor.Fig. 3 is the measuring principle block diagram of whole system.
Two CT(current transformers) method is applicable to the high voltage length cable cross interconnected apart from metal sheath, at cable two terminals installation electric current, voltage transformer (VT) electric current, voltage signal is gathered.Gps antenna receives the time signal that satellite sends, synchronous signal acquisition is the time service function of utilizing GPS, send synchronous pps pulse per second signal to the Multi-path synchronous mould at two ends/number conversion chip by gps antenna, make it carry out synchronized sampling, by the GPRS Wireless Data Transmission electric current, the voltage signal that collects is transferred to computing machine, in computing machine, carries out computing and show the result.
The present invention can be applied to the power cable major insulation dielectric dissipation factor of other electric pressure and structure and the on-line monitoring of electric capacity, the present invention can generally be applicable to all power cables, no matter its shielding whether interconnected can, every needs carry out the place of power cable insulation on-line monitoring and can directly use.
And the present invention can monitor the major insulation state of power cable, thereby can avoid the generation of the system short-circuit fault that causes owing to power cable major insulation fault, the tremendous economic loss that the unplanned power failure of avoiding therefore causing produces.
The on-Line Monitor Device of embodiment two, the cross interconnected lower threephase cable major insulation of metal sheath, this device comprise three pairs of current transformers, three pairs of voltage transformer (VT), two three road I-V change-over circuits, two six tunnel synchronous mould/number conversion circuit and CPU (central processing unit); Wherein said two three road I-V change-over circuits lay respectively at the two ends of tested threephase cable, and described two six tunnel synchronous mould/number conversion circuit lay respectively at the two ends of tested threephase cable;
Every pair of current transformer is used for detecting respectively the current signal at phase cable two ends;
Every pair of voltage transformer (VT) is used for detecting respectively the voltage signal at phase cable two ends;
The current signal output end that is positioned at three current transformers of threephase cable one end connects respectively three current signal input ends of three road I-V change-over circuits that are positioned at this end, and three analog voltage signal output terminals of this three road I-V change-over circuit connect respectively three input end of analog signal of the synchronous mould that is positioned at this end/number conversion circuit; The change over clock of this synchronous mould/number conversion circuit is the gps satellite synchronous clock;
The voltage signal output end that is positioned at three voltage transformer (VT) of threephase cable one end connects respectively three input end of analog signal of the synchronous mould that is positioned at this end/number conversion circuit; The change over clock source of this synchronous mould/number conversion circuit is the gps satellite synchronous clock source;
The digital signal output end of two six tunnel synchronous mould/number conversion circuit is connected respectively data input pin and is connected with CPU (central processing unit), described CPU (central processing unit) is processed six voltage signals and six current signals that the synchronization collection obtains, obtain dielectric dissipation factor, and then obtain the cross interconnected lower threephase cable insulating property of metal sheath.
The difference of the on-Line Monitor Device of embodiment three, this implementation and the cross interconnected lower threephase cable major insulation of embodiment one described metal sheath is; all include holding circuit in each three road I-V change-over circuit, be used for realizing over-current over-voltage protection.
The difference of the on-Line Monitor Device of embodiment four, this implementation and the cross interconnected lower threephase cable major insulation of embodiment two described metal sheaths is, adopts the mode of GPRS wireless transmission to realize data transmission between two six tunnel synchronous mould/number conversion circuit and the CPU (central processing unit).
Claims (8)
1. the on-line monitoring method of the cross interconnected lower threephase cable major insulation of metal sheath, it is characterized in that: it is realized by following methods:
Two end at threephase cable access respectively electric current, voltage transformer (VT); And by the synchronous pps pulse per second signal that gps system provides, producing synchronous sampling signal, the control A/D converter begins voltage signal and the current signal at threephase cable two ends are carried out synchronous acquisition;
It is poor that the current signal at the every phase cable two ends that obtain according to the synchronization collection is done, and obtains the leakage current of this phase cable;
According to the leakage current of every phase cable and the complementary angle of the phase difference of voltage at these phase cable two ends of synchronization collection acquisition, obtain the dielectric loss angle of threephase cable, finally obtain the dielectric dissipation factor of threephase cable; Thereby realize the on-line monitoring of the cross interconnected lower threephase cable insulating property of metal sheath.
2. the on-line monitoring method of the cross interconnected lower threephase cable major insulation of metal sheath according to claim 1 is characterized in that: the method that gathers the current signal at threephase cable two ends is:
Adopt current transformer to gather the current value of every phase cable end, convert analog voltage signal with gathering the current analog signal that obtains to by the I-V change-over circuit;
Adopt mould/number conversion circuit to convert this analog voltage signal to digital signal.
3. the on-line monitoring method of the cross interconnected lower threephase cable major insulation of metal sheath according to claim 2 is characterized in that: the method that gathers the voltage signal at threephase cable two ends is:
Adopt voltage transformer (VT) to gather the magnitude of voltage of every phase cable end, carry out adopting mould/number conversion circuit to convert this analog voltage signal to digital signal after the scaled down with gathering the voltage analog signal that obtains.
4. the on-line monitoring method of the cross interconnected lower threephase cable major insulation of metal sheath according to claim 3, it is characterized in that: the method take the gps satellite synchronous clock as foundation as: described mould/number conversion circuit adopts synchronous mould/number conversion circuit, and adopt the gps satellite synchronous clock as the conversion and control clock of this mould/number conversion circuit, and then realize synchronous acquisition and the conversion of data.
5. the on-line monitoring method of the cross interconnected lower threephase cable major insulation of metal sheath according to claim 4 is characterized in that: the digital signal that the current signal of collection converts the digital signal of acquisition to and the voltage signal conversion that gathers obtains realizes data transmission by the mode of GPRS wireless transmission respectively.
6. the on-Line Monitor Device of the cross interconnected lower threephase cable major insulation of metal sheath, it is characterized in that: this device comprises three pairs of current transformers, three pairs of voltage transformer (VT), two three road I-V change-over circuits, two six tunnel synchronous mould/number conversion circuit and CPU (central processing unit); Wherein said two three road I-V change-over circuits lay respectively at the two ends of tested threephase cable, and described two six tunnel synchronous mould/number conversion circuit lay respectively at the two ends of tested threephase cable;
Every pair of current transformer is used for detecting respectively the current signal at phase cable two ends;
Every pair of voltage transformer (VT) is used for detecting respectively the voltage signal at phase cable two ends;
The current signal output end that is positioned at three current transformers of threephase cable one end connects respectively three current signal input ends of three road I-V change-over circuits that are positioned at this end, and three analog voltage signal output terminals of this three road I-V change-over circuit connect respectively three input end of analog signal of the synchronous mould that is positioned at this end/number conversion circuit; The change over clock of this synchronous mould/number conversion circuit is the gps satellite synchronous clock;
The voltage signal output end that is positioned at three voltage transformer (VT) of threephase cable one end connects respectively three input end of analog signal of the synchronous mould that is positioned at this end/number conversion circuit; The change over clock source of this synchronous mould/number conversion circuit is the gps satellite synchronous clock source;
The digital signal output end of two six tunnel synchronous mould/number conversion circuit is connected respectively data input pin and is connected with CPU (central processing unit), described CPU (central processing unit) is processed six voltage signals and six current signals that the synchronization collection obtains, obtain dielectric dissipation factor, and then obtain the cross interconnected lower threephase cable insulating property of metal sheath.
7. the on-Line Monitor Device of the cross interconnected lower threephase cable major insulation of metal sheath according to claim 6 is characterized in that: all include holding circuit in each three road I-V change-over circuit, be used for realizing over-current over-voltage protection.
8. the on-Line Monitor Device of the cross interconnected lower threephase cable major insulation of metal sheath according to claim 7 is characterized in that: adopt the mode of GPRS wireless transmission to realize data transmission between two six tunnel synchronous mould/number conversion circuit and the CPU (central processing unit).
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| CN109782137A (en) * | 2018-12-06 | 2019-05-21 | 安徽凯川电力保护设备有限公司 | A kind of insulation line monitoring device and method |
| CN111157915A (en) * | 2019-12-31 | 2020-05-15 | 国网北京市电力公司 | Cable leakage current detection method and device, storage medium and processor |
| CN111366819A (en) * | 2020-02-18 | 2020-07-03 | 神华国华（北京）电力研究院有限公司 | Cable insulation state monitoring system and method |
| CN111679162A (en) * | 2020-06-02 | 2020-09-18 | 国网浙江义乌市供电有限公司 | Insulation monitoring method and device for transformer substation cable |
| CN112014698A (en) * | 2020-08-26 | 2020-12-01 | 浙江巨磁智能技术有限公司 | Long cable residual current detection device and method for low-voltage alternating current power supply system |
| CN112485616A (en) * | 2020-11-27 | 2021-03-12 | 国网北京市电力公司 | Cable insulation aging detection method and device, storage medium and processor |
| CN112946521A (en) * | 2021-02-04 | 2021-06-11 | 重庆景文源智科技有限公司 | Power distribution network cable leakage current online detection method and insulation state monitoring method |
| CN113109678A (en) * | 2021-04-15 | 2021-07-13 | 广东电网有限责任公司 | Cable insulation monitoring method and device |
| CN114371363A (en) * | 2022-01-06 | 2022-04-19 | 广州市扬新技术研究有限责任公司 | Online monitoring system and method for network cable of rail transit contact network |
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