CN104034966A - Online measurement method of MYPTJ mining high voltage cable insulation resistance - Google Patents
Online measurement method of MYPTJ mining high voltage cable insulation resistance Download PDFInfo
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- CN104034966A CN104034966A CN201410225805.6A CN201410225805A CN104034966A CN 104034966 A CN104034966 A CN 104034966A CN 201410225805 A CN201410225805 A CN 201410225805A CN 104034966 A CN104034966 A CN 104034966A
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- 238000009413 insulation Methods 0.000 title claims abstract description 37
- 238000000691 measurement method Methods 0.000 title abstract 2
- 238000005065 mining Methods 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract description 24
- 230000032683 aging Effects 0.000 claims abstract description 4
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 3
- 239000003245 coal Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 abstract 1
- 238000012544 monitoring process Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 230000007935 neutral effect Effects 0.000 description 5
- 230000008033 biological extinction Effects 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 240000005572 Syzygium cordatum Species 0.000 description 1
- 235000006650 Syzygium cordatum Nutrition 0.000 description 1
- YSIITVVESCNIPR-UHFFFAOYSA-N Troxipide Chemical compound COC1=C(OC)C(OC)=CC(C(=O)NC2CNCCC2)=C1 YSIITVVESCNIPR-UHFFFAOYSA-N 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
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Abstract
本发明公开了一种MYPTJ矿用高压电缆绝缘电阻在线测量方法，针对MYPTJ矿用高压电缆回路三相建立集中T型等值电路模型，采集供电系统配电装置出口处电缆运行电压信号有效值和电流信号有效值，基于基尔霍夫电流定律和基尔霍夫电压定律，分别得出各相线路任意位置处电压及电流与配电装置出口处电压及电流的关系，最后运用模型参数识别法原理，进行最小二乘意义参数估计，分别求出各相电缆绝缘电阻值，若电缆绝缘电阻值低于安全阀值，说明电缆绝缘层存在老化问题。本发明检测方法简单，容易实施，可实时在线监测电缆绝缘水平，降低电缆故障发生率，提高矿井电缆供电的可靠性，保证煤矿安全生产的连续性。
The invention discloses an on-line measurement method for the insulation resistance of MYPTJ mine high-voltage cables. A centralized T-type equivalent circuit model is established for the three-phase MYPTJ mine high-voltage cable circuit, and the effective value and the effective value of the cable operating voltage signal at the outlet of the power distribution device of the power supply system are collected. The effective value of the current signal, based on Kirchhoff's current law and Kirchhoff's voltage law, respectively obtains the relationship between the voltage and current at any position of each phase line and the voltage and current at the outlet of the power distribution device, and finally uses the model parameter identification method According to the principle, the parameter estimation of the least squares meaning is carried out, and the insulation resistance value of each phase cable is calculated separately. If the cable insulation resistance value is lower than the safety threshold, it indicates that there is an aging problem in the cable insulation layer. The detection method of the invention is simple and easy to implement, and can monitor the cable insulation level on-line in real time, reduce the occurrence rate of cable faults, improve the reliability of mine cable power supply, and ensure the continuity of safe production in coal mines.
Description
Technical field
The invention belongs to electrical equipment online supervision technical field, be specifically related to a kind of On-line Measuring Method of MYPTJ mine high-voltage cable insulation resistance.
Background technology
MYPTJ mine high-voltage cable is the key equipment in Coal Mine Power Distribution System, and whether cable security of operation, affects Safety of Coal Mine Production and power supply reliability and security.Colliery subsurface environment is special, and cable is often subject to the impact of the environment such as roof fall, humidity in operational process, is subject to galvanochemistry, thermochemistry and the effect of the mechanical equal stress factor, causes electric branch or water tree and occurs, causes its dielectric level to reduce, even reduction of service life.Therefore, in order to improve mine power supply reliability, ensure colliery power supply safety, avoid causing because cable insulation is deteriorated the generation of the particularly serious accident such as gas, coal dust guarantee, need badly and find a kind of effective ways to carry out real time on-line monitoring to cable insulation level.
In recent years, cable insulation on-line monitoring is the focus of Chinese scholars research always, and the scholars of this area do a lot of work, and have proposed many measuring methods, but also has at present some bottleneck problems.For example, DC superposition method is difficult to Measurement accuracy and gathers to receive pacify level electric current, is easily subject to cable sheath insulated electro halation and rings, and measurement result is dispersed large, and precision is difficult to guarantee; DC-method is measured to be needed to consider cable sheath Grounding, and DC component is very faint, under stray current impact, is difficult to Measurement accuracy; Dielectric loss angle tangent method can not effectively reflect indivedual defects of concentrating, and need to consider respectively relatively electric current when measurement, and implementation procedure is more complicated; Exchange method of superposition or low frequency method of superposition because restricted by field apparatus, effectively collection signal, operating experience is few simultaneously, is difficult to be applied to engineering reality.In the downhole neutral point compensated distribution network of colliery, existing method cannot online evaluation cable insulation level.
Summary of the invention
The On-line Measuring Method that the invention provides a kind of MYPTJ mine high-voltage cable insulation resistance, overcomes the shortcoming that existing monitoring method cannot be applied in neutral by arc extinction coil grounding system, can real time on-line monitoring cable insulation level.
Technical scheme provided by the invention is: a kind of MYPTJ mine high-voltage cable insulation resistance On-line Measuring Method, it is characterized in that, and comprising:
For MYPTJ mine high-voltage cable loop three-phase, set up and concentrate T-shaped Type Equivalent Circuit Model;
Gather electric power system power distribution equipment exit cable working voltage signal effective value and current signal effective value;
Based on Kirchhoff's current law (KCL) and Kirchhoff's second law, draw respectively the relation of each phase circuit any position voltage and electric current and power distribution equipment exit voltage and electric current;
Performance model Parameter Identification principle, carries out least square meaning parameter estimation, obtains respectively each phase insulating resistance of cable value, if insulating resistance of cable value lower than safe threshold values, illustrates that cable insulation exists problem of aging.
Further, described voltage signal effective value and current signal effective value are by being arranged on the voltage transformer (VT) summation current transformer collection in electric power system power distribution equipment exit.
Further, described voltage signal effective value and current signal effective value are effective value.
The present invention has overcome the defect that existing method is applied in the downhole neutral point compensated distribution network of colliery, can effectively reflect the dielectric level height of cable used in neutral by arc extinction coil grounding system.Method facilities and equipments of the present invention are few, method is simple, the busbar voltage of moving by collection and electric current, carry out the parameter estimation under least square meaning, obtain insulating resistance of cable value, realize the Real-Time Monitoring to cable insulation level, reduce mine underground cable power supply trouble incidence, improve cable power supply reliability.
Brief description of the drawings
Fig. 1 is the T-shaped Type Equivalent Circuit Model of MYPTJ cable;
Fig. 2 is voltage and current metering circuit figure;
Fig. 3 is model parameter recognition principle figure.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
The invention provides a kind of MYPTJ mine high-voltage cable insulation resistance On-line Measuring Method, specifically comprise:
(1) for MYPTJ mine high-voltage cable loop A, B, C three-phase, set up and concentrate T-shaped Type Equivalent Circuit Model, specifically as shown in Figure 1, in figure
ra1with
ra2be respectively cable line A phase
x aequivalent resistance before and after place;
la1with
la2be respectively cable line A phase
x aequivalent inductance before and after place;
ragfor
x aplace's insulation resistance;
cafor
x a place's distributed capacitance.
rb1with
rb2be respectively cable line B phase
x b equivalent resistance before and after place;
lb1with
lb2be respectively cable line B phase
x b equivalent inductance before and after place;
rbgfor
x b place's insulation resistance;
cbfor
x b place's distributed capacitance.
rc1with
rc2be respectively cable line C phase
x c equivalent resistance before and after place;
lc1with
lc2be respectively cable line C phase
x c equivalent inductance before and after place;
rcgfor
x c place's insulation resistance;
ccfor
x cplace's distributed capacitance.
(2) voltage transformer (VT) summation current transformer is installed in underground power supply system power distribution equipment exit, colliery, gather electric power system power distribution equipment exit cable working voltage signal effective value and current signal effective value, this effective value is effective value, and concrete position as shown in Figure 2.
In Fig. 2, in the neutral by arc extinction coil grounding electric power system of colliery, current transformer and voltage transformer (VT) are installed in power distribution equipment exit, what wherein in figure, installed at 1 place is current transformer, and what in figure, installed at 2 places is voltage transformer (VT).
Each phase voltage signal effective value and current signal effective value when voltage transformer (VT) summation current transformer gathers respectively cable operation,
kmagnitude of voltage and the current value in some moment are respectively
u c (k)with
i c (k),
k-1magnitude of voltage and the current value in some moment are respectively
u c (k-1)with
i c (k-1),
k+1magnitude of voltage and the current value in some moment are respectively
u c (k+1)with
i c (k+1),
k+2magnitude of voltage and the current value in some moment are respectively
u c (k+2)with
i c (k+2).
(3), based on Kirchhoff's current law (KCL) and Kirchhoff's second law, can obtain circuit optional position
xplace's voltage
u x and electric current
i x and power distribution equipment exit voltage
u c and electric current
i c relation, in the present embodiment taking the insulation measurement of C phase as example:
（1）
（2）
（3）
Can be drawn by formula (1), (2), (3):
（4）
Formula (4) is One-terminal formula, in order to be connected with engineering is actual, uses numerical differentiation to replace time domain differential, and formula (1), (2), (3), (4) can be changed to:
（5）
（6）
（7）
（8）
（9）
（10）
（11）
In formula (5) ~ (11),
u c (k),
i c (k)represent respectively sampling
kpoint moment voltage effective value and current effective value,
tit is a sampling period,
u c can be expressed as:
（12）
(4) performance model Parameter Identification principle, with MYPTJ cable C phase
r c1 ,
r c2 ,
r cg ,
l c1 ,
l c2 ,
c c for unknown parameter, with voltage
u c (k)and electric current
i c (k)for known parameters, set up the differential equation, calculate for convenience and write, voltage and current coefficient is replaced, as the formula (13):
（13）
Easy in order to calculate, will sample
kpoint moment voltage effective value and current effective value
u c (k), i c (k)be expressed as:
（14）
Simultaneous formula (12), (13), (14), the identification of moving model parameter, carry out least square meaning parameter estimation and obtain:
（15）
Formula (15) set up condition, need to find one suitable
make:
（16）
Thereby can obtain the insulation resistance of MYPTJ cable C phase
r cg .Equally, employing same principle can be in the hope of A phase insulation resistance
r ag with B phase insulation resistance
r bg .If insulating resistance of cable value lower than safe threshold values, illustrates that cable insulation exists problem of aging.
As shown in Figure 3, for model parameter recognition principle figure, voltage signal effective value and current signal effective value enter secondary mutual inductor, be converted to suitable voltage signal, transfer to industrial computer through communicating circuit again, in industrial computer, complete the model parameter identification to signal, obtain cable C phase insulation resistance, if insulation resistance during lower than safe threshold values, illustrates that cable insulation exists deterioration condition.Equally, can be in the hope of A phase insulation resistance and B phase insulation resistance according to this principle.
Method centering point compensated distribution network MYPTJ mine cable insulation resistance of the present invention carries out on-line monitoring, optional equipment is few, and method is simple, can real-time estimate cable insulation level, reduce mine underground cable power supply trouble incidence, improve cable power supply reliability.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. a MYPTJ mine high-voltage cable insulation resistance On-line Measuring Method, is characterized in that, comprising:
Gather electric power system power distribution equipment exit cable working voltage signal effective value and current signal effective value;
Based on Kirchhoff's current law (KCL) and Kirchhoff's second law, draw respectively the relation of each phase circuit any position voltage and electric current and power distribution equipment exit voltage and electric current;
Performance model Parameter Identification principle, carries out least square meaning parameter estimation, obtains respectively each phase insulating resistance of cable value, if insulating resistance of cable value lower than safe threshold values, illustrates that cable insulation exists problem of aging.
2. MYPTJ mine high-voltage cable insulation resistance On-line Measuring Method according to claim 1, it is characterized in that, described voltage signal effective value and current signal effective value are by being arranged on the voltage transformer (VT) summation current transformer collection in electric power system power distribution equipment exit.
3. MYPTJ mine high-voltage cable insulation resistance On-line Measuring Method according to claim 1 and 2, is characterized in that, described voltage signal effective value and current signal effective value are effective value.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105527548A (en) * | 2015-12-01 | 2016-04-27 | 太原理工大学 | Cable insulation diagnosis method based on alternating current stray current distribution of coal mine well |
| CN106841924A (en) * | 2017-03-06 | 2017-06-13 | 西安交通大学 | Distribution network line insulated monitoring method based on parameter identification |
| CN106950464A (en) * | 2017-03-19 | 2017-07-14 | 沈阳顺义科技有限公司 | A kind of certain type panzer Cable fault examination system based on path optimization |
| CN107621595A (en) * | 2017-03-28 | 2018-01-23 | 国网四川省电力公司电力科学研究院 | A device and method for evaluating the insulation state of a power cable |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101893672A (en) * | 2010-07-03 | 2010-11-24 | 太原理工大学 | A state monitoring and fault diagnosis and early warning device for mine-used high-voltage cables |
| CN103135031A (en) * | 2012-12-31 | 2013-06-05 | 中国矿业大学 | Coal mine grid system insulation state monitoring method |
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2014
- 2014-05-27 CN CN201410225805.6A patent/CN104034966A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101893672A (en) * | 2010-07-03 | 2010-11-24 | 太原理工大学 | A state monitoring and fault diagnosis and early warning device for mine-used high-voltage cables |
| CN103135031A (en) * | 2012-12-31 | 2013-06-05 | 中国矿业大学 | Coal mine grid system insulation state monitoring method |
Non-Patent Citations (2)
| Title |
|---|
| 孙尚斌: "基于模型参数辨识的矿井电网漏电保护", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
| 孙建涛 等: "高压XLPE 电缆绝缘多参数在线监测", 《电力自动化设备》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105527548A (en) * | 2015-12-01 | 2016-04-27 | 太原理工大学 | Cable insulation diagnosis method based on alternating current stray current distribution of coal mine well |
| CN105527548B (en) * | 2015-12-01 | 2018-02-02 | 太原理工大学 | A kind of cable insulation diagnostic method based on the distribution of underground coal mine alternative stray current |
| CN106841924A (en) * | 2017-03-06 | 2017-06-13 | 西安交通大学 | Distribution network line insulated monitoring method based on parameter identification |
| CN106950464A (en) * | 2017-03-19 | 2017-07-14 | 沈阳顺义科技有限公司 | A kind of certain type panzer Cable fault examination system based on path optimization |
| CN106950464B (en) * | 2017-03-19 | 2023-05-09 | 沈阳顺义科技有限公司 | Armored car cable fault detection system based on path optimization |
| CN107621595A (en) * | 2017-03-28 | 2018-01-23 | 国网四川省电力公司电力科学研究院 | A device and method for evaluating the insulation state of a power cable |
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Application publication date: 20140910 |