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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Abstract
The invention discloses an online measurement method of the MYPTJ mining high voltage cable insulation resistance. The online measurement method comprises establishing a concentrated T type equivalent circuit model for three phases of an MYPTJ mining high voltage cable circuit; collecting a voltage signal effective value and a current signal effective value of cable running at the position of an outlet of a power supply system power distribution device; obtaining relations between the voltage and the current at any position of circuits of the phases and the voltage and the current at the position of the outlet of the power distribution device based on the Kirchhoff's current law and the Kirchhoff's voltage law; performing least square meaning parameter estimation through the model parameter identification method principle to calculate cable insulation resistance values of the phases, wherein a cable insulation layer is aged if the cable insulation resistance value is lower than a safety valve value. According to the online measurement method of the MYPTJ mining high voltage cable insulation resistance, the detection method is simple and easy to implement, the real-time online monitoring can be performed on the cable insulation level, and accordingly the cable fault occurrence rate is reduced, the reliability of mine cable power supply is improved, and the continuity of safety production of a coal mine is ensured.
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 kind of Condition assessment of insulation device and method of power cable |
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| CN101893672A (en) * | 2010-07-03 | 2010-11-24 | 太原理工大学 | Mine high-voltage cable state monitoring and fault diagnosis prewarning device |
| 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
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| CN101893672A (en) * | 2010-07-03 | 2010-11-24 | 太原理工大学 | Mine high-voltage cable state monitoring and fault diagnosis prewarning device |
| 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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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 kind of Condition assessment of insulation device and method of power cable |
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