CN109387705A - A kind of shunt capacitor presence monitoring system - Google Patents
A kind of shunt capacitor presence monitoring system Download PDFInfo
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- CN109387705A CN109387705A CN201811079847.8A CN201811079847A CN109387705A CN 109387705 A CN109387705 A CN 109387705A CN 201811079847 A CN201811079847 A CN 201811079847A CN 109387705 A CN109387705 A CN 109387705A
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- shunt capacitor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
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Abstract
The invention discloses a kind of shunt capacitor presence monitoring systems, including voltage transformer, current transformer, vector network analyzer, system host and remote monitoring module, the following steps are included: a) extracting the configured transmission of voltage transformer and current transformer respectively using vector network analyzer, it is denoted as the voltage compensation factor, the current compensation factor respectively；B) system host obtains the electric current of the potential and current transformers output of voltage transformer output, calculates voltage, the electric current of shunt capacitor to be measured；C) measurement capacitor, inductance, the resistance of shunt capacitor to be measured are solved using least square；D) the measurement capacitor of shunt capacitor and rated capacity are subjected to operation to judge whether system host issues shunt capacitor fault warning, and alarm is transmitted to remote monitoring module；E) voltage, the electric current for analyzing shunt capacitor to be measured, respectively obtain voltage harmonic, the current harmonics of shunt capacitor to be measured.
Description
Technical field
The present invention will be related to electrical equipment monitoring technology field, and in particular to a kind of shunt capacitor presence monitoring system
System.
Background technique
Shunt capacitor is a kind of very widely used reactive-load compensation equipment in the power system, is mainly used for compensation electricity
The reactive power of Force system inductive load can be effectively improved the power factor of system, improve power quality, be to ensure entire electricity
The important means of the stable operation of Force system, therefore the safe operation and troubleshooting of shunt capacitor are most important.Although close
The production technology of capacitor has large increase over year, but since many reasons, capacitor faults still happen occasionally, influences electricity
The reliability of Force system.Currently, being the mode of correction maintenance and preventative periodic inspection, nothing to the maintenance mode of shunt capacitor
Method finds the capacitor of faulty hidden danger in time, and there are equipment safety hidden danger.
Meanwhile amplified harmonic current caused by shunt capacitor and harmonic resonance can cause tremendous influence to power grid, from
Body is also easily damaged because of harmonic wave overcurrent.Passing Operation of Electric Systems experience have shown that, shunt capacitor group is due to Harmfulness Caused by Harmonics
The case where causing damage is very serious.Statistical data is shown, the parallel capacitor group of half is had more than in China's electric system
It is unable to operate normally or even has been damaged because of influence from harmonic.The inactive power compensation of capacitor group so can not have both been played,
Hidden danger is caused for system safety operation again simultaneously.
Application No. is the Chinese invention patent application of CN201711343723.1, to disclose a kind of shunt capacitor electric online
Road parameter detection method can not judge although proposing the detection method of a kind of capacitor of shunt capacitor, inductance and resistance
Whether whether tested shunt capacitor damage, need to safeguard or replace, and the voltage and current that can not also analyze shunt capacitor is humorous
Shunt capacitor audible and visible alarm, voltage and current harmonic wave can not be also wirelessly transmitted to specified monitoring point by wave.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of shunt capacitor presence monitoring system, can solve existing
There is the monitoring system of shunt capacitor often can not accurately obtain the circuit parameter of shunt capacitor, it can not be into its health status
The problem of row accurate evaluation.
The invention is realized by the following technical scheme:
A kind of shunt capacitor presence monitoring system, including voltage transformer, current transformer, vector network analysis
Instrument, system host and remote monitoring module, comprising the following steps:
A) voltage transformer and current transformer are connected to shunt capacitor to be measured, utilize vector network analyzer point
It indescribably takes voltage transformer and current transformer in the configured transmission of 50HZ-10KHZ frequency, is denoted as the voltage compensation factor respectively
P1, current compensation factor Q 1；
B) system host obtains the voltage U1 of voltage transformer output and the electric current I1 of current transformer output, measurement frequency point
Number is N, then the voltage U of shunt capacitor to be measured are as follows:
U=U1*P1 (1)
Electric current I are as follows:
I=I1*Q1 (2)；
C) measurement capacitor C, inductance L, the resistance R of shunt capacitor to be measured are solved using least square；
D) the measurement capacitor C of shunt capacitor and rated capacity C0 is subjected to operation, whenOrWhen, system host issues shunt capacitor fault warning, and alarm is transmitted to remote monitoring module；
E) voltage U, the electric current I for utilizing Fourier transform analysis shunt capacitor to be measured, respectively obtain shunt capacitance to be measured
Voltage harmonic, the current harmonics of device.
Further scheme of the invention is that the step c) defines the circuit parameter of shunt capacitor to be measured: measurement capacitor
C, inductance L, resistance R, then its impedance Z are as follows:
In formula, j is imaginary unit, and f is frequency；
It can be obtained by formula (3):
Enable f2=x1, f-2=x-1, formula (4) may be expressed as:
In formula, xT=[x-1, x1], Z=[R, L, C] obtains N group data (x according to measurement frequency point number N-1n, x1n, yn)；
One group of initial value is given, Z is denoted as(0), it may be assumed that
Z(0)=[R(0),L(0),C(0)] (6)
It willIn Z(0)Taylor series expansion is pressed at place, and omits item secondary and more than two times, can be obtained:
In formula, Z=[R, L, C] is solved using the least square of linear function:
In formula, d >=0 is known as damping factor；
Enable Q respectively to R, the first-order partial derivative of L, C are equal to zero, and so that Q value is reached minimum, obtains:
In formula
Solution formula (10), and the constantly iteration above process obtains the capacitor C, inductance L, resistance R of shunt capacitor:
The advantages of the present invention over the prior art are that:
By effectively being monitored to running shunt capacitor state, reflect the performance parameter of capacitor in real time, leads to
The method for crossing science monitors electric capacitor group information, and establishes high order by analysis and summary with total junction capacitor group moving law
Harmonic wave, resonance frequency, which are estimated, the index systems such as sentences, and concludes from many and diverse current and voltage signals data, extracts crucial monitoring index number
According to, and showed by way of wireless transmission, O&M service personnel can be helped to find the potential failure institute of capacitor group in time
To effectively improve power grid O&M maintenance department to the analysis ability of equipment, there is important theory and engineering significance.
Detailed description of the invention
Fig. 1 is the principle of the present invention block diagram.
Fig. 2 is the shunt capacitor impedance test results in embodiment.
Specific embodiment
A kind of shunt capacitor presence monitoring system as shown in Figure 1, to monitor the electricity in parallel of 10KV in certain substation
For container, including voltage transformer, current transformer, vector network analyzer, system host and remote monitoring module, including
Following steps:
A) voltage transformer and current transformer are connected to shunt capacitor to be measured, utilize vector network analyzer point
It indescribably takes voltage transformer and current transformer in the configured transmission of 50HZ-10KHZ frequency, is denoted as the voltage compensation factor respectively
P1, current compensation factor Q 1；
B) system host obtains the voltage U1 of voltage transformer output and the electric current I1 of current transformer output, measurement frequency point
Number is N=1024, then the voltage U of shunt capacitor to be measured are as follows:
U=U1*P1 (1)
Electric current I are as follows:
I=I1*Q1 (2)；
C) it defines the circuit parameter of shunt capacitor to be measured: measuring capacitor C, inductance L, resistance R, then its impedance Z are as follows:
In formula, j is imaginary unit, and f is frequency；
It can be obtained by formula (3):
Enable f2=x1, f-2=x-1, formula (4) may be expressed as:
In formula, xT=[x-1, x1], Z=[R, L, C] obtains N group data (x according to measurement frequency point number N-1n, x1n, yn)；
One group of initial value is given, Z is denoted as(0), it may be assumed that
Z(0)=[R(0),L(0),C(0)] (6)
It willIn Z(0)Taylor series expansion is pressed at place, and omits item secondary and more than two times, can be obtained:
In formula, Z=[R, L, C] uses the minimum of linear function at this point, nonlinear function is converted to linear function
Two multiply solution:
In formula, d >=0 is known as damping factor；
Enable Q respectively to R, the first-order partial derivative of L, C are equal to zero, and so that Q value is reached minimum, obtains:
In formula
Solution formula (10), and the constantly iteration above process obtains the capacitor C, inductance L, resistance R of shunt capacitor:
D) the measurement capacitor C of shunt capacitor and rated capacity C0 is subjected to operation, whenOrWhen, system host issues shunt capacitor fault warning, and alarm is transmitted to remote monitoring module；
E) voltage U, the electric current I for utilizing Fourier transform analysis shunt capacitor to be measured, respectively obtain shunt capacitance to be measured
Voltage harmonic, the current harmonics of device.
Claims (2)
1. a kind of shunt capacitor presence monitoring system, including voltage transformer, current transformer, vector network analysis
Instrument, system host and remote monitoring module, it is characterised in that the following steps are included:
A) voltage transformer and current transformer are connected to shunt capacitor to be measured, are mentioned respectively using vector network analyzer
It takes voltage transformer and current transformer in the configured transmission of 50HZ-10KHZ frequency, is denoted as voltage compensation factor P1, electricity respectively
Flow compensation factor Q1；
B) system host obtains the voltage U1 of voltage transformer output and the electric current I1 of current transformer output, and measurement frequency point number is equal
For N, then the voltage U of shunt capacitor to be measured are as follows:
U=U1*P1 (1)
Electric current I are as follows:
I=I1*Q1 (2)；
C) measurement capacitor C, inductance L, the resistance R of shunt capacitor to be measured are solved using least square；
D) the measurement capacitor C of shunt capacitor and rated capacity C0 is subjected to operation, whenOr
When, system host issues shunt capacitor fault warning, and alarm is transmitted to remote monitoring module；
E) voltage U, the electric current I for utilizing Fourier transform analysis shunt capacitor to be measured, respectively obtain shunt capacitor to be measured
Voltage harmonic, current harmonics.
2. a kind of shunt capacitor presence monitoring system as described in claim 1, it is characterised in that: the step c) is fixed
The circuit parameter of justice shunt capacitor to be measured: capacitor C, inductance L, resistance R are measured, then its impedance Z are as follows:
In formula, j is imaginary unit, and f is frequency；
It can be obtained by formula (3):
Enable f2=x1, f-2=x-1, formula (4) may be expressed as:
In formula, xT=[x-1, x1], Z=[R, L, C] obtains N group data (x according to measurement frequency point number N-1n, x1n, yn)；
One group of initial value is given, Z is denoted as(0), it may be assumed that
Z(0)=[R(0),L(0),C(0)] (6)
It willIn Z(0)Taylor series expansion is pressed at place, and omits item secondary and more than two times, can be obtained:
In formula, Z=[R, L, C] is solved using the least square of linear function:
In formula, d >=0 is known as damping factor；
Enable Q respectively to R, the first-order partial derivative of L, C are equal to zero, and so that Q value is reached minimum, obtains:
In formula
Solution formula (10), and the constantly iteration above process obtains the capacitor C, inductance L, resistance R of shunt capacitor:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811079847.8A CN109387705A (en) | 2018-09-14 | 2018-09-14 | A kind of shunt capacitor presence monitoring system |
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| CN201811079847.8A CN109387705A (en) | 2018-09-14 | 2018-09-14 | A kind of shunt capacitor presence monitoring system |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011163785A (en) * | 2010-02-05 | 2011-08-25 | Mitsubishi Electric Corp | Load abnormality detector |
| CN102818958A (en) * | 2012-08-22 | 2012-12-12 | 山东惠工电气股份有限公司 | On-line monitoring method and on-line monitoring device for transformer substation parallel connection compensating capacitor group |
| CN103323672A (en) * | 2013-05-27 | 2013-09-25 | 云南电力试验研究院（集团）有限公司电力研究院 | Online resonant early warning device and method for parallel-connection power capacitor |
| CN103592554A (en) * | 2013-12-03 | 2014-02-19 | 武汉大学 | On-line monitoring system and method of 35kV high voltage shunt capacitor |
| CN105352427A (en) * | 2015-10-20 | 2016-02-24 | 江苏省电力公司淮安供电公司 | On-line detection method for detecting deformation of transformer winding |
| CN107085148A (en) * | 2017-03-20 | 2017-08-22 | 国网江苏省电力公司无锡供电公司 | The online tolerance limit method for early warning and device of a kind of shunt capacitor group |
| CN207148211U (en) * | 2017-06-15 | 2018-03-27 | 贾保军 | A kind of condenser current harmonic protection device |
| CN108196180A (en) * | 2017-12-14 | 2018-06-22 | 国网江苏省电力有限公司淮安供电分公司 | A kind of shunt capacitor online circuit parameter detection method |
-
2018
- 2018-09-14 CN CN201811079847.8A patent/CN109387705A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011163785A (en) * | 2010-02-05 | 2011-08-25 | Mitsubishi Electric Corp | Load abnormality detector |
| CN102818958A (en) * | 2012-08-22 | 2012-12-12 | 山东惠工电气股份有限公司 | On-line monitoring method and on-line monitoring device for transformer substation parallel connection compensating capacitor group |
| CN103323672A (en) * | 2013-05-27 | 2013-09-25 | 云南电力试验研究院（集团）有限公司电力研究院 | Online resonant early warning device and method for parallel-connection power capacitor |
| CN103592554A (en) * | 2013-12-03 | 2014-02-19 | 武汉大学 | On-line monitoring system and method of 35kV high voltage shunt capacitor |
| CN105352427A (en) * | 2015-10-20 | 2016-02-24 | 江苏省电力公司淮安供电公司 | On-line detection method for detecting deformation of transformer winding |
| CN107085148A (en) * | 2017-03-20 | 2017-08-22 | 国网江苏省电力公司无锡供电公司 | The online tolerance limit method for early warning and device of a kind of shunt capacitor group |
| CN207148211U (en) * | 2017-06-15 | 2018-03-27 | 贾保军 | A kind of condenser current harmonic protection device |
| CN108196180A (en) * | 2017-12-14 | 2018-06-22 | 国网江苏省电力有限公司淮安供电分公司 | A kind of shunt capacitor online circuit parameter detection method |
Non-Patent Citations (1)
| Title |
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| 甘景福 等: "并联电容器保护与监测一体化实施方案", 《电力科学与工程》 * |
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Application publication date: 20190226 |