CN103941161A - On-line monitoring system for current and carrying capacity of cable sheath - Google Patents

On-line monitoring system for current and carrying capacity of cable sheath Download PDF

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Publication number
CN103941161A
CN103941161A CN201410197322.XA CN201410197322A CN103941161A CN 103941161 A CN103941161 A CN 103941161A CN 201410197322 A CN201410197322 A CN 201410197322A CN 103941161 A CN103941161 A CN 103941161A
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China
Prior art keywords
current
cable
sheath
carrying capacity
circulating
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Pending
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CN201410197322.XA
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Chinese (zh)
Inventor
袁燕岭
周灏
郝乾
陈昕
袁继军
任建国
杨志才
甘景福
孙超
穆勇
王玉坚
肖寒
韩丹
刘轩明
刘长亮
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BEIJING FUJIA ANDA ELECTRICAL TECHNOLOGY Co Ltd
State Grid Corp of China SGCC
Tangshan Power Supply Co of State Grid Jibei Electric Power Co Ltd
Original Assignee
BEIJING FUJIA ANDA ELECTRICAL TECHNOLOGY Co Ltd
State Grid Corp of China SGCC
Tangshan Power Supply Co of State Grid Jibei Electric Power Co Ltd
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Publication date
Application filed by BEIJING FUJIA ANDA ELECTRICAL TECHNOLOGY Co Ltd, State Grid Corp of China SGCC, Tangshan Power Supply Co of State Grid Jibei Electric Power Co Ltd filed Critical BEIJING FUJIA ANDA ELECTRICAL TECHNOLOGY Co Ltd
Priority to CN201410197322.XA priority Critical patent/CN103941161A/en
Publication of CN103941161A publication Critical patent/CN103941161A/en
Pending legal-status Critical Current

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Abstract

The invention relates to an on-line monitoring system for the current and carrying capacity of a cable sheath, belonging to the field of a power cable on-line monitoring technology. The technical scheme is as follows: firstly, setting a plurality of different measurement points, intersecting and interconnecting clamp current sensors sleeved on the inlet wire of an earth box under the condition that a cable electrically operates, and acquiring the sheath current signals; obtaining the cable capacity data by a clamp current sensor sleeved on a cable body; secondly, synchronously acquiring the sheath current signals and the capacity data through the clamp current sensor sleeved on the cable body; thirdly, uploading the acquired sheath current signals and the capacity data to an upper computer for theoretical calculation; and fourthly, comparing the sheath current signals acquired in real time and expected sheath current values under a non-fault condition, and simultaneously comparing the sheath current values of the different measuring points so as to position, early warn and reminder faults. According to the on-line monitoring system, the current which flows through a power cable metal sheath can be monitored on line, so that the reliable basis can be provided for the faults in the process of diagnosing the cable.

Description

A kind of cable sheath electric current and current-carrying capacity on-line monitoring system
Technical field
The present invention relates to a kind of cable sheath electric current and current-carrying capacity on-line monitoring system, the method that relates in particular to each measurement point circulating current of a kind of synchro measure power cable sheath electric current and current-carrying capacity simulation calculation desired value under fault and non-malfunction, belongs to power cable on-line monitoring technique field.
Background technology
When medium and high voltage cable two ends ground connection or during by cross interconnected mode ground connection simultaneously, between cable sheath and the earth, form closed loop.The summation of the leakage current producing in the induction current producing because of induced voltage in this loop and cable insulation is called as circulating current.At present, in the cable sheath Current calculation method of background technology, the induced voltage in cable metal sheath and the electric current that induces is regarded as the circulating current of cable, and the Leakage Current producing in cable insulation is left in the basket because its amplitude is little [1-3].Ignore Leakage Current and can cause the error between result of calculation and actual result to increase, while carrying out fault diagnosis in the situation that impedance loop is higher, easily cable ruuning situation is produced to wrong diagnosis.
Summary of the invention
The object of the invention is to provide a kind of cable sheath electric current and current-carrying capacity on-line monitoring system, by setting up reasonable mathematical model, emulation to the circulating current under common cable splice failure condition, for follow-up cable fault diagnosis location provides reliable foundation, solve the impact on circulating current existing in background technology and consider problem not enough and to circulating current mutation analysis deficiency under failure condition.
Technical scheme of the present invention is:
Cable sheath electric current and a current-carrying capacity on-line monitoring system, comprise following steps:
1. a plurality of different measuring points are set, on the cross interconnected grounding box inlet wire under the charged ruuning situation of cable, are set with pincerlike current sensor, gather circulating current signal; By being sleeved on the pincerlike current sensor on cable body, obtain current-carrying capacity of cable data;
2. data collecting card synchronous acquisition circulating current signal and current-carrying capacity data;
3. upload the circulating current signal and current-carrying capacity data to the host computer that collect and carry out theory calculating;
4. by Real-time Collection to circulating current value and the expection circulating current value under non-failure condition compare, carry out the comparison between the circulating current value of different measuring point simultaneously, under abnomal condition, automatically identify the fault type of fault in cable, fault is positioned and early warning.
When cable line adopts the directly grounded cross interconnected mode in two ends, at the incoming line of two cross interconnected grounding boxes (JX1 and JX2), pincerlike current sensor is installed respectively, each cross interconnected grounding box has 3 incoming lines, (as shown in Figure 1, three incoming lines of cross interconnected grounding box JX1 are A1(A2), B1(B2), C1(C2)), six measurement points are set altogether; By the current waveform of each measurement point of data collecting card synchronous acquisition, obtain altogether six groups of current waveforms at every turn; Meanwhile, the current-carrying capacity in cable is by being set in three current sensor synchronous acquisitions on threephase cable body; With concentric cable, as cross interconnected wiring, come stube cable joint and cross interconnected grounding box, the current value that current sensor records is the vector of the electric current that flows through of concentric cable internal and external conductor.This is also that existing cable sheath electric current diagnostic techniques does not take in, and is also a key character of the present invention.
The present invention adopts the mode of Computer Simulation, according to power cable raw data and algorithm, calculates and under non-failure condition, expects circulating current value, namely circulating current theoretical value; Circulating current under non-failure condition comprises induced voltage in cable and the induction current producing and the leakage current being produced by insulation resistance; Faradic influence factor comprises current-carrying capacity, cable section length, cable laying mode and the cable body design parameter of cable; Leakage Current is mainly comprised of the capacitance current that flows through cable insulation, is subject to the impact of cable working voltage and cable section length; Under fault and non-failure condition, all consider that leakage current is another main feature in the present invention on the impact of circulating current amplitude.
The present invention can be to having return wire and carrying out on-line monitoring and fault diagnosis without the cable of two kinds of modes of connection of return wire, have or not the key distinction of the cable line of return wire to be the variation of the resistance of earth resistance, the different resistance values of the earth can affect the size of electric current in metal sheath, and this electric current can produce the variation of several times according to the return wire design of circuit.
The present invention includes current sensor, front end processor, communication system, host computer, power supply unit and alarm unit.System feature is, cable sheath electric current and the current-carrying capacity of each measurement point in each systemic circulation section of cable line of (one) automatic synchronization collection; (2), by the program of establishing in system, can the desired value under the circulating current fault of each measurement point and non-malfunction be carried out simulation calculation and is stored in database, for further fault diagnosis location provides important references.The present invention is Real-Time Monitoring cable running status, in time abnormal condition is reacted very big support is provided.
The invention has the beneficial effects as follows, the electric current flowing through in can on-line monitoring power cable metal sheath, and calculate the electric current desired value of each circulating current measurement point of emulation under fault and non-failure condition by theory, for the fault in diagnosing cable provides reliable foundation.
Accompanying drawing explanation
Fig. 1 is the main body wiring diagram of the embodiment of the present invention;
1 finger three phase line wherein, 2 refer to tag, and 3 refer to direct grounding box (J1 refers to direct grounding box No., and J2 refers to direct grounding box No. two), 4 refer to pincerlike current sensor, 5 refer to metal sheath extension line, and 6 refer to intermediate head, and 7 refer to the segment of cross interconnected cable, 8 refer to cross interconnected grounding box, JX1 refers to cross interconnected grounding box No. one, and JX2 refers to cross interconnected grounding box No. two, and #1-#9 represents respectively nine segment cables;
Fig. 2 is the faradic theoretical calculation method schematic diagram producing due to induced voltage in the present invention;
Fig. 3 is the equivalent circuit diagram of Fig. 2;
Fig. 4 is the computing method schematic diagram of the cross interconnected cable sheath electric current under non-failure condition of the present invention;
Fig. 5 is the electric current flowing through in 6 measurement points of cross interconnected grounding box of the present invention;
Equivalent circuit diagram when Fig. 6 is cross interconnected case water inlet;
Fig. 7 is the equivalent circuit diagram of JX1 joint C1-C2 splice insulation dividing plate while puncturing.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Cable sheath electric current and a current-carrying capacity on-line monitoring system, comprise following steps:
1. on the cross interconnected grounding box inlet wire under the charged ruuning situation of cable, be set with pincerlike current sensor, gather circulating current signal; By being sleeved on the pincerlike current sensor on cable body, gather current-carrying capacity of cable data; 2. by data collecting card synchronous acquisition current signal; 3. upload the circulating current and current-carrying capacity data to the host computer that collect and carry out theory calculating, for further diagnosing cable fault provides reliable basis.
Embodiment more specifically:
With reference to accompanying drawing 1, cable line adopts the directly grounded cross interconnected mode in two ends, and wherein metal sheath connected mode is as follows: A1-B2, B1-C2, C1-A2; B3-C4, C3-A4, A3-B4.The induction current flowing through in metal sheath as shown in Figure 2, represent respectively induction current separately in three sheath loops, represent respectively the current-carrying capacity in threephase cable, represent cable section length, ..., ..., represent respectively induced voltage separately and the impedance in nine corresponding cable segments, represent earth resistance.By Fig. 3, can obtain three induction current sums in loop, as shown in formula (1):
Induced voltage in formula (1) can pass through formula (2) and calculate:
Wherein the coefficient of self-induction that represents threephase cable, represent A phase B phase, the coefficient of mutual inductance between B phase C phase and A phase C phase cable, and can pass through formula (3) acquisition:
Wherein, represent cable core diameter, representative represents respectively A phase B phase, the spacing between B phase C phase and A phase C phase cable.
Line impedance in formula (1) can be by following equation inference:
Wherein, represent the impedance of metal sheath unit, represent metal sheath unit's induction reactance.They can pass through formula (5) (6) and calculate acquisition:
In formula (6) represent conductor resistance rate, represent metal sheath cross-sectional area, represent conductor temperature coefficient, represent environment temperature.By formula (2)-(6) substitution formula (1), can calculate respectively the amplitude of three induction current sums in sheath loop.
Circulating current not only comprises the induction current being produced by induced voltage, also should comprise the capacitance current that flows through insulation.As shown in Figure 4, represent to produce in #1 cable to the mobile capacitance current of both direction, , represent to produce in #2 cable to the mobile capacitance current of both direction, by that analogy, the capacitance current of the both direction producing in expression #9 cable.The total capacitance electric current producing in each cable segmentation can calculate by following formula:
Wherein, the working voltage that represents this section of cable. represent cable insulation specific capacitance, its amplitude can be passed through formula (8) and calculate:
The capacitance current producing in each cable partial circulating section can be to both direction shunting under the effect of resistance, and the impedance magnitude of the capacitance current size after shunting in this path determines.Take #1 cable as example:
By that analogy, can calculate the capacitance current after the shunting producing in all cable partial circulating sections.
Power cable sheath current data acquisition system as shown in Figure 5.At the incoming line of 2 cross interconnected grounding boxes, lay pincerlike current sensor respectively, 6 measurement points are set altogether, wherein represent three measured electric currents of incoming line current transformer of the cross interconnected grounding box of JX1, represent three measured electric currents of incoming line current transformer of the cross interconnected grounding box of JX2.Because every cross interconnected connecting line is connected with two circulation loops, so the current signal recording by split core type current transformer is the vector of two circulation loop currents.
For cross interconnected grounding box JX1, the electric current that three measurement point current transformers are surveyed is respectively , can obtain so formula (10), formula is as follows:
For cross interconnected grounding box JX2, the electric current that three measurement point current transformers are surveyed is respectively , can obtain so formula (11), formula is as follows:
The electric current wherein flowing through in each cable partial circulating section should be induction current and capacitance current sum.Their amplitude can be calculated by following formula:
Bring formula (12) into formula (11) and can calculate the calculated value under the non-malfunction of circulating current that 6 measurement point measure.
Cable metal sheath fracture, cross interconnected grounding box water inlet and splice insulation dividing plate puncture the cable sheath curent change that three kinds of faults cause can be positioned to sheath loop, place or fault joint by on-line monitoring of cable system diagnostics and by the position of trouble spot.When cable occurs that sheath ruptures the open circuit fault causing, the electric current in fault loop becomes 0.The circulating current of the measurement point that comprises fault loop there will be decline than normal condition.
In the time of cross interconnected joint JX1 water inlet, because water body inside and outside interconnected case is connected, cause coverage of water to be far longer than interconnected case area, so being left in the basket, the resistance of water body disregards.Its equivalent circuit diagram as shown in Figure 6.During fault, three sheath loops are originally because fault ground becomes 6 fault loop.These six fault currents are defined as respectively , according to the voltage in loop and impedance, can release:
The induction current of six measurement points can use formula (14) to represent, capacitance current remains unchanged:
It is example that splice insulation dividing plate breakdown fault be take the joint at C1-C2 place, and equivalent circuit diagram as shown in Figure 7.When joint C1-C2 breaks down, do not affect current conditions in loop, therefore in Fig. 7, omit this loop.In figure represent the fault current flowing through respectively in four fault branches, use cyclic current method, can obtain the value of fault current in these four branch roads.Three loop currents are defined as respectively , can release:
Fault current available formula (18) represents:
According to installation of sensors position, the induced electricity flow valuve of six measurement points can use formula (19) to represent, capacitance current value remains unchanged:
More than analyzed the theoretical value of the circulating current that under three kinds of failure conditions, measurement point can be surveyed, by circulating current that Real-time Collection is arrived and the comparison of the expection circulating current value under non-failure condition, and the comparison between the circulating current of different measuring point, can assess cable line health status.The desired value of circulating current under the non-failure condition of power cable sheath electric current and the ratio between the circulating current of different measuring point are stored in the database in main website after simulation calculation.When the data of passing back when cable sheath current monitoring data collection station have reached the identification grade of fault as calculated afterwards, system will be reported to the police, and early warning.Except the mode of simulation calculation, the circulating current desired value under the non-malfunction of circulating current can also be obtained mean value and obtains by gather real data within a period of time.
Except to being provided with the diagnosis of cross interconnected cable system of return wire, the present invention can also not carry out on-line monitoring to installing back the cross interconnected cable system of streamline.Both topmost differences are the size of earth resistance resistance.Due to a return wire plain conductor normally, so sheath loop forms path through return wire, the impedance in whole loop is very little.If do not install back streamline, sheath loop forms loop by the earth, and the resulting impedance in loop is subject to the impact of earth resistance.According to the difference of geographical conditions, the earth resistance in each cable system is not identical yet, and under normal circumstances, Standard resistance range floats between 4 Ω-10 Ω.This just need to, before simulation calculation, make simulation result close with actual result by measuring earth resistance.By setting the size of earth resistance, can carry out on-line monitoring to installing back the threephase cable system of streamline whether two states.
The advantage of the power cable sheath electric current on-line monitoring system in the present invention is can be by being arranged on cross interconnected case place and being sleeved on current transformer real-time online measuring cable sheath electric current and the current-carrying capacity on cable body.When cable grounding system breaks down, power cable sheath electric current on-line monitoring system can with the combined action of cable fault diagnostic system, in fault, find in time in early days fault and locate fault to trouble spot, for cable management personnel's maintenance and service work provides important information support, guaranteeing important effect to be played aspect power system stability operation.

Claims (3)

1. cable sheath electric current and a current-carrying capacity on-line monitoring system, is characterized in that, comprises following steps:
1. a plurality of different measuring points are set, on the cross interconnected grounding box inlet wire under the charged ruuning situation of cable, are set with pincerlike current sensor, gather circulating current signal; By being sleeved on the pincerlike current sensor on cable body, obtain current-carrying capacity of cable data;
2. data collecting card synchronous acquisition circulating current signal and current-carrying capacity data;
3. upload the circulating current signal and current-carrying capacity data to the host computer that collect and carry out theory calculating;
4. by Real-time Collection to circulating current value and the expection circulating current value under non-failure condition compare, carry out the comparison between the circulating current value of different measuring point simultaneously, under abnomal condition, automatically identify the fault type of fault in cable, fault is positioned and early warning.
2. a kind of cable sheath electric current according to claim 1 and current-carrying capacity on-line monitoring system, it is characterized in that adopting the directly grounded cross interconnected mode in two ends when cable line, at the incoming line of two cross interconnected grounding boxes (JX1 and JX2), pincerlike current sensor is installed respectively, each cross interconnected grounding box has three incoming lines, and six measurement points are set altogether; By the current waveform of each measurement point of data collecting card synchronous acquisition, obtain altogether six groups of current waveforms at every turn; Meanwhile, the current-carrying capacity in cable is by being set in three current sensor synchronous acquisitions on threephase cable body; With concentric cable, as cross interconnected wiring, come stube cable joint and cross interconnected grounding box, the current value that current sensor records is the vector of the electric current that flows through of concentric cable internal and external conductor.
3. a kind of cable sheath electric current according to claim 1 and 2 and current-carrying capacity on-line monitoring system, it is characterized in that adopting the mode of Computer Simulation, according to power cable raw data and algorithm, calculate and under non-failure condition, expect circulating current value, namely circulating current theoretical value; Circulating current under non-failure condition comprises induced voltage in cable and the induction current producing and the leakage current being produced by insulation resistance; Faradic influence factor comprises current-carrying capacity, cable section length, cable laying mode and the cable body design parameter of cable; Leakage Current is mainly comprised of the capacitance current that flows through cable insulation, is subject to the impact of cable working voltage and cable section length; Under fault and non-failure condition, all consider the impact of leakage current on circulating current amplitude.
CN201410197322.XA 2014-05-12 2014-05-12 On-line monitoring system for current and carrying capacity of cable sheath Pending CN103941161A (en)

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CN104483571A (en) * 2014-12-17 2015-04-01 安徽泰瑞通达机电设备有限公司 Cable insulation detection method
CN105004907A (en) * 2015-04-20 2015-10-28 江苏省电力公司常州供电公司 Power cable intersect cross connection grounding system grounding current monitoring and evaluating method
CN105445526A (en) * 2015-11-20 2016-03-30 国家电网公司 Structure for measuring insulation leakage current of single-core cable in operation
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CN107728001A (en) * 2017-08-21 2018-02-23 国网北京市电力公司 Three-phase cross cable current fault detection device
CN108267664A (en) * 2016-12-30 2018-07-10 孙麓轩 A kind of cable diagnostics method and apparatus
CN108445342A (en) * 2018-03-01 2018-08-24 华南理工大学 A kind of cable cover(ing) single-point metallicity fault ground induced current calculating method
CN108445341A (en) * 2018-03-01 2018-08-24 华南理工大学 The computational methods of each section of Leakage Current under a kind of cable cover(ing) multipoint earthing
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CN108646144A (en) * 2018-07-25 2018-10-12 国家电网有限公司 A kind of offline distance measuring method of high voltage single-core cable short trouble, apparatus and system
CN108710016A (en) * 2018-03-01 2018-10-26 华南理工大学 A kind of computational methods of the single-core cable distributed electrical capacitance current of the golden cloth containing insulation
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CN108761167A (en) * 2018-03-01 2018-11-06 华南理工大学 Sheath induced current calculates method under a kind of cable metal sheath multiphase multipoint earthing
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CN104483571B (en) * 2014-12-17 2017-11-10 安徽泰瑞通达机电设备有限公司 Cable insulation detection method
CN105988061B (en) * 2015-02-05 2019-03-22 云南酷联科技有限公司 A kind of method of high voltage single-core cable protective layer fault location
CN105988061A (en) * 2015-02-05 2016-10-05 云南酷联科技有限公司 High voltage single core cable protective layer fault locating method
CN105004907A (en) * 2015-04-20 2015-10-28 江苏省电力公司常州供电公司 Power cable intersect cross connection grounding system grounding current monitoring and evaluating method
CN105445526A (en) * 2015-11-20 2016-03-30 国家电网公司 Structure for measuring insulation leakage current of single-core cable in operation
CN105445526B (en) * 2015-11-20 2018-10-12 国家电网公司 The measurement structure of single cable insulation leakage current under a kind of service condition
CN105445633A (en) * 2015-12-24 2016-03-30 浙江中电智能科技有限公司 High-voltage cable protective layer loop current multi-state monitoring device
CN106405348A (en) * 2016-08-30 2017-02-15 合肥智博电气有限公司 Electric cable insulation detection apparatus collection system
CN106771863A (en) * 2016-12-09 2017-05-31 国网江苏省电力公司苏州供电公司 The short trouble localization method of high-tension cable-trolley line mixed power transmission line
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CN107102240A (en) * 2017-05-19 2017-08-29 中国电力科学研究院 A kind of system and method for being used to carry out optical fiber composite low-voltage cable fault diagnosis
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CN108710016B (en) * 2018-03-01 2019-10-18 华南理工大学 A kind of calculation method of the single-core cable distributed electrical capacitance current containing the golden cloth that insulate
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CN108710016A (en) * 2018-03-01 2018-10-26 华南理工大学 A kind of computational methods of the single-core cable distributed electrical capacitance current of the golden cloth containing insulation
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CN108761167A (en) * 2018-03-01 2018-11-06 华南理工大学 Sheath induced current calculates method under a kind of cable metal sheath multiphase multipoint earthing
CN108761166B (en) * 2018-03-01 2019-10-18 华南理工大学 A kind of induced current calculating method of the cable metal sheath N point ground connection based on matrix analysis
CN108519537B (en) * 2018-03-01 2019-10-18 华南理工大学 Leak electricity greatly flow calculation methodologies under a kind of cable metal sheath multipoint earthing
CN108445342A (en) * 2018-03-01 2018-08-24 华南理工大学 A kind of cable cover(ing) single-point metallicity fault ground induced current calculating method
CN109030925A (en) * 2018-06-25 2018-12-18 国网冀北电力有限公司唐山供电公司 A kind of three-core cable phase current wireless supervisory control system
CN108646144A (en) * 2018-07-25 2018-10-12 国家电网有限公司 A kind of offline distance measuring method of high voltage single-core cable short trouble, apparatus and system
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CN109613419A (en) * 2019-01-23 2019-04-12 天津津铁博瑞科技有限公司 Shield voltage limiter monitors system
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Application publication date: 20140723