CN107247204B - State monitoring system and monitoring method for voltage limiters in ultra-high and extra-high voltage series compensation device - Google Patents
State monitoring system and monitoring method for voltage limiters in ultra-high and extra-high voltage series compensation device Download PDFInfo
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Abstract
The invention discloses a state monitoring system and a monitoring method of voltage limiters in an extra-high voltage and extra-high voltage series compensation device, wherein two column voltage limiters in each group of voltage limiter units are arranged between a high-voltage bus and a low-voltage bus in a parallel mode; the first voltage divider collects voltage signals of the voltage limiter units, the micro-current mutual inductor collects leakage current signals of the voltage limiter units, and then the collected voltage signals and the collected leakage current signals are transmitted to the data processing unit in the ground monitoring platform to be processed, so that the micro-current mutual inductor can simultaneously measure leakage current when the two column voltage limiters are connected in parallel.
Description
Technical Field
The invention relates to the technical field of on-line monitoring of the running state of an electric power system, in particular to a state monitoring system and a monitoring method of a voltage limiter in an extra-high voltage and extra-high voltage series compensation device.
Background
In an ultra-high voltage and extra-high voltage series compensation device, a voltage limiter is basic protection equipment of a capacitor bank, and in order to ensure the absorbed power of the voltage limiter, the voltage limiter is usually in a multi-column parallel connection mode; however, the voltage limiter can be locally degraded under the action of continuous working voltage after long-term operation, so that the uniform distribution of current among columns is damaged, even faults can be caused in severe cases, and the safe and stable operation of a power grid is influenced; therefore, an online monitoring system or a monitoring method is needed, the operation state of each column pressure limiter can be monitored in real time, when the abnormal operation of the pressure limiter is found, the alarm prompt can be accurately positioned, the arrangement of power failure maintenance by engineering personnel is facilitated, the unplanned outage time of the series compensation device is reduced, and the operation reliability of the series compensation device is improved.
At present, most of conventional online voltage limiter monitoring methods are suitable for low voltage grades, and effective diagnosis methods for ultra-high and extra-high voltage grades are lacked; chinese patent application CN201120572134.2 "arrester on-line monitoring device" discloses an arrester on-line monitoring device on a series compensation capacitor, which uses an acquisition coil sleeved on an arrester to measure the leakage current of the column arrester, and outputs a signal through an acquisition device; chinese patent application CN201210461731.7 "online monitoring device and method for voltage limiter in series compensation capacitor" discloses an online monitoring device and method for voltage limiter in series compensation capacitor, the invention uses current transformer installed near the high voltage end of the voltage limiter to measure the leakage current of the column voltage limiter, and outputs the signal through the sensing head part at the top end of the insulating support; however, in an ultra-high voltage and extra-high voltage series compensation system, the voltage limiter is usually over 20 columns, the fault leakage current of the single column voltage limiter is only hundreds of mu A magnitude, and the fault of the single column voltage limiter is difficult to diagnose by adopting the monitoring device or the method; if a monitor is installed on each column, a large burden is brought to a data acquisition system and a power supply system of a series compensation platform monitoring device, and the reliability of the system is influenced; in addition, the series compensation platform is in a high-electric field and strong magnetic field environment, the environmental temperature change is large, and the measurement accuracy of the monitoring equipment is influenced, so that a new monitoring system and a new monitoring method are needed for carrying out real-time online monitoring and analysis diagnosis on the voltage limiters in the ultra-high voltage and extra-high voltage series compensation devices.
Disclosure of Invention
The invention aims to provide a state monitoring system and a monitoring method of voltage limiters in an extra-high voltage series compensation device, which can monitor single-column voltage limiters in the extra-high voltage series compensation device and the extra-high voltage series compensation device, reduce the number of monitors and improve the monitoring precision and accuracy.
The technical scheme of the invention is as follows: a state monitoring system of a voltage limiter in an ultra-high voltage and extra-high voltage series compensation device comprises a data acquisition unit, a ground monitoring platform and an optical fiber signal transmission unit, wherein the data acquisition unit is used for acquiring leakage current and voltage of a plurality of groups of voltage limiter units in an ultra-high voltage and extra-high voltage power grid; the multiple groups of voltage limiter units comprise two column voltage limiters which are connected in parallel between the high-voltage bus and the low-voltage bus; the data acquisition unit comprises a first voltage divider for acquiring the voltage of the voltage limiter unit, a voltage limiter measuring box and a plurality of micro-current transformers for acquiring the leakage current of the voltage limiter unit; the voltage limiter measuring box comprises an electromagnetic shielding shell and a data acquisition board card arranged in the electromagnetic shielding shell; the ground monitoring platform comprises a data processing unit; the signal acquisition ends of the micro-current transformers are respectively connected with the current signal output ends of the multiple groups of voltage limiter units, and the signal output ends of the micro-current transformers are connected with the signal input end of the data acquisition board card; the signal acquisition end of the first voltage divider is respectively connected with the voltage signal output ends of the multiple groups of voltage limiter units, and the signal output end of the first voltage divider is connected with the signal input end of the data acquisition board card.
Furthermore, the two column voltage limiters in each group of voltage limiter units are connected in parallel through an aluminum row, and two ends of the aluminum row are respectively connected to the bottom plates of the two column voltage limiters.
Furthermore, a connecting wire is led out from a bottom plate of any one column voltage limiter in each group of voltage limiter units and connected to the low-voltage busbar, a signal acquisition end of the micro-current transformer is connected with the connecting wire, and high-voltage wiring ends of two column voltage limiters in each group of voltage limiter units are connected to the high-voltage bus.
And the optical fiber signal transmission unit comprises an optical fiber column and two photoelectric conversion modules respectively arranged at two ends of the optical fiber column, and the two photoelectric conversion modules are respectively connected with the data acquisition board card and the signal transmission interface of the data processing unit.
The high-voltage bus and the low-voltage bus are respectively connected with the high-voltage bus and the low-voltage bus, and the voltage output end of the second voltage divider is respectively connected with the voltage input end of the micro-current transformer and the voltage input end of the data acquisition board card and used for providing a direct-current power supply for the micro-current transformer and the data acquisition board card of the data acquisition unit.
Furthermore, a current and voltage limiting protection module for preventing surge current from damaging the data acquisition board card is arranged at the voltage input end of the data acquisition board card.
The monitoring method of the state monitoring system of the voltage limiters in the ultra-high voltage and extra-high voltage series compensation device is further characterized by comprising the following steps:
step A: the micro-current transformer and the first voltage divider respectively collect leakage current and voltage of the voltage limiter unit and transmit collected signals to the data collection board card;
and B: the data acquisition board transmits the acquired leakage current signal and voltage signal to the data processing unit through the optical fiber signal transmission unit;
and C: the data processing unit analyzes and processes the leakage current signal and the voltage signal, and specifically comprises the following steps of C1-C3:
step C1: the data processing unit calculates the collected leakage current signal and voltage signal of the voltage limiter unit by applying a fast Fourier transform and a bimodal interpolation algorithm based on a Blackman-Harris window;
the cosine window of the Blackman-Harris window is generally expressed as:
a k is the number of terms of the cosine window, N is the number of sampling points, K =3,a 0 ＝0.35875，a 1 ＝0.48829，a 2 ＝14128，a 3 ＝0.01168；
Calculating fundamental wave and third harmonic component parameters, performing double-peak difference operation on leakage current signals of the voltage limiter unit, and obtaining a fundamental wave current amplitude I after calculation 1 Phase of fundamental current θ i1 Third harmonic current amplitude I 3 Third harmonic current phase θ i3 (ii) a The full current amplitude I can be calculated by the sum of squares of the amplitudes of the harmonics.
Performing double-peak difference operation on the voltage signal measured by the first voltage divider to obtain a fundamental wave phase theta u1 The fundamental resistive current I can be obtained r1 ：
I r1 ＝I 1 cos(θ u1 -θ i1 )
The third harmonic component of the resistive current is in reverse phase with the fundamental component of the resistive current, and the amplitude I of the third harmonic component of the resistive current r3 The calculation formula is as follows:
I r3 ＝I 3 cos(θ u1 +180°-θ i3 )
and step C2: using harmonic analysis, i.e. by fundamental resistive current I r1 And resistive current third harmonic component amplitude I r3 The operating conditions of a plurality of groups of voltage limiter units are distinguished: when the valve plate of the voltage limiter is aged, the third harmonic component amplitude I of the resistive current r3 Will increase significantly; when the interior of the voltage limiter is affected by tide, the fundamental wave resistive current I r1 A significant increase;
and C3: respectively carrying out differential comparison on leakage current signals of the multiple groups of voltage limiter units and positioning the fault voltage limiter units; because the probability of problems occurring in multiple groups of voltage limiter units is low at the same time, if a certain voltage limiter unit has a fault, the leakage current parameter of the certain voltage limiter unit exceeds a set threshold value or has a large difference with the measurement data of other groups of voltage limiter units, the monitoring system is positioned as the fault voltage limiter unit, and starts a fault alarm to remind a worker to maintain in time.
According to the invention, each group of voltage limiter units comprises two column voltage limiters which are arranged between the high-voltage bus and the low-voltage bus in a parallel mode; the voltage signal of the voltage limiter unit is collected through the first voltage divider, the leakage current signal of the voltage limiter unit is collected through the micro-current transformer, and then the collected voltage signal and the leakage current signal are transmitted to the data processing unit in the ground monitoring platform to be processed, so that the micro-current transformer can simultaneously measure the leakage current when the two column voltage limiters are connected in parallel.
And when a certain voltage limiter unit fails, the aluminum bar can be detached to respectively test the two column voltage limiters, and only the failed voltage limiter needs to be replaced after the failure is confirmed.
Further ground optical fiber signal transmission unit includes the optical fiber post and sets up two photoelectric conversion modules at the optical fiber post both ends respectively, and two photoelectric conversion modules are connected with the signal transmission interface of data acquisition integrated circuit board and data processing unit respectively, convert and transmit the signal of gathering through optical fiber signal transmission unit, and the interference killing feature is strong, can effectually keep apart the electromagnetic interference who comes from power and high-voltage platform, has effectively solved the influence of electromagnetic interference to measurement accuracy.
Furthermore, a current-limiting and voltage-limiting protection module is arranged at the voltage input end of the data acquisition board card, so that the data acquisition board card can be prevented from being damaged by surge current, and the stability of the system is enhanced.
Furthermore, by designing a monitoring method realized on a ground monitoring platform, the collected leakage current signals and voltage signals of the voltage limiter unit are calculated based on Blackman-Harris window fast Fourier transform and a double-peak interpolation algorithm, and the calculated parameters are analyzed and early warned, so that the monitoring accuracy of the voltage limiter unit is improved, and the stability of ultra-high and extra-high voltage systems is enhanced.
Drawings
FIG. 1 is a schematic diagram of the present invention;
fig. 2 is a schematic connection diagram of the voltage limiter unit according to the present invention;
FIG. 3 is a flow chart of the present invention.
Detailed Description
A state monitoring system suitable for voltage limiters in an extra-high voltage series compensation device is disclosed, as shown in figures 1 and 2, the embodiment adopts an optimized voltage limiter connection scheme without being connected with ground wires in an extra-high voltage power grid and an extra-high voltage power grid; the ultra-high and extra-high voltage power grids comprise a multi-column voltage limiter array consisting of twenty column voltage limiters, wherein the multi-column voltage limiter array is positioned on a series compensation platform and is in the same grade with the line voltage; the bottom plates 202 of two adjacent column voltage limiters are connected through an aluminum row 201 to form a group of voltage limiter units 104 connected in parallel; namely, the on-site twenty-column voltage limiters form ten groups of voltage limiter units 104 which are connected in parallel; an aluminum stranded wire 204 is led out from the bottom plate 202 of any one column voltage limiter in each group of voltage limiter units 104 and is connected to a low-voltage busbar 205, and the high-voltage terminals of two column voltage limiters in each group of voltage limiter units 104 are connected to a high-voltage bus 203.
The monitoring system comprises a data acquisition unit 101 for acquiring leakage current and voltage of a plurality of groups of voltage limiter units 104 in an ultra-high voltage and extra-high voltage power grid, a ground monitoring platform 111 for analyzing, diagnosing and giving fault alarm to acquired leakage current and voltage signals, and an optical fiber signal transmission unit 102 for transmitting the signals acquired by the data acquisition unit 101 to the ground monitoring platform 111.
The data acquisition unit 101 comprises a first voltage divider 106a for acquiring voltage signals of the voltage limiter unit 104, a voltage limiter measurement box 109 and a plurality of micro-current transformers 105 for acquiring leakage currents of the voltage limiter unit 104; the voltage limiter measuring box 109 is equipotential with the low-voltage busbar 205 and is arranged beside the voltage limiter unit 104, the voltage limiter measuring box 109 comprises an electromagnetic shielding shell and a data acquisition board card 107 arranged in the electromagnetic shielding shell, and a current-limiting and voltage-limiting protection module is arranged at the voltage input end of the data acquisition board card 107 to prevent surge current from damaging the acquisition board; the micro-current transformer 105 is a zero-flux current transformer and has a straight-through structure, and the influence of exciting current on the measurement precision of the transformer is eliminated by using a compensation winding, so that a sensor coil always works in a zero-load state, and the precision of the sensor coil meets the measurement of 200 muA-10 mA leakage current in the voltage limiter unit 104; an operational amplifier circuit is arranged in the micro-current transformer 105, and the current of +/-10 mA is converted into a voltage signal of +/-5V which can be collected and processed by a collection card; the plurality of micro-current transformers 105 are respectively installed between the bottom plate 202 and the low-voltage bus bar 205 of the plurality of groups of voltage limiter units 104, and the plurality of micro-current transformers 105 respectively pass through the aluminum stranded wires 204 connected between the bottom plate 202 and the low-voltage bus bar 205 of the plurality of groups of voltage limiter units 104 to realize that the current signal output end is connected with the signal output end of the voltage limiter unit 104; the signal output ends of the micro-current transformers 105 are connected with the signal input end of the data acquisition board card 107 and are used for transmitting the acquired leakage current of the voltage limiter unit 104 to the data acquisition board card 107, so that after the optimized voltage limiter connection scheme is combined, one micro-current transformer 105 can simultaneously measure the leakage current of two parallel column voltage limiters, because the two parallel column voltage limiters in one group of voltage limiter units 104 are connected in parallel, the resistance of the two parallel column voltage limiters is half of the resistance of a single column voltage limiter, the leakage current measured by the micro-current transformer 105 is doubled, the micro-current transformer 105 is more sensitive in monitoring the leakage current of the voltage limiter unit 104, the number of the micro-current transformers 105 is reduced, and the monitoring precision of a sensor is ensured; the aluminum row 201 is convenient to disassemble and easy to replace, when a certain voltage limiter unit 104 has a fault, the aluminum row 201 can be disassembled to test the two column voltage limiters respectively, and only the fault voltage limiter needs to be replaced after the fault is confirmed.
The first voltage divider 106a is installed on the voltage limiter measuring box 109, the signal acquisition end and the signal output end of the first voltage divider 106a are respectively connected with the voltage signal output end of the voltage limiter unit 104 and the signal input end of the data acquisition board card 107, and are used for acquiring the voltage of the voltage limiter unit 104 and transmitting the acquired voltage information to the data acquisition board card 107, because multiple groups of voltage limiter units 104 are connected in parallel between the high-voltage bus 203 and the low-voltage bus 205, and the voltages at the two ends of the multiple groups of voltage limiter units 104 are the same, the high-voltage terminal and the low-voltage terminal of the first voltage divider 106a only need to be respectively connected to the high-voltage bus 203 and the low-voltage bus 205 to realize voltage signal acquisition, and the signal output end is connected with the signal input end of the data acquisition board card 107; the voltage limiter measurement box 109 is further provided with a second voltage divider 106b, a high-voltage terminal and a low-voltage terminal of the second voltage divider 106b are also connected to the high-voltage bus 203 and the low-voltage bus 205 respectively, and a voltage output end of the second voltage divider 106b is connected to a voltage input end of the micro-current transformer 105 and a voltage input end of the data acquisition board card 107 respectively, and is used for providing 12V direct-current power for the micro-current transformer 105 and the data acquisition board card 107.
The optical fiber signal transmission unit 102 comprises an optical fiber column 110 and two photoelectric conversion modules 108 respectively arranged at two ends of the optical fiber column 110, and the two photoelectric conversion modules 108 are respectively connected with the signal transmission interfaces of the data acquisition board card 107 and the data processing unit 103; because the power supply on the high-voltage series compensation platform is difficult to obtain, all groups of data need to be transmitted to the ground for processing, the optical fiber transmission system has high transmission rate, large communication capacity and strong anti-interference performance, can effectively isolate the electromagnetic interference from the power supply and the high-voltage platform, effectively solves the influence of the electromagnetic interference on the measurement precision, and adopts optical fiber communication to realize the signal transmission between the series compensation platform and the ground; in the operation process of the ultra-high voltage and extra-high voltage power grids, the photoelectric conversion module 108 converts the collected electric parameters into optical signals, and synchronously transmits multiple paths of signals to the ground monitoring platform 111 through the optical fiber column 110, so that real-time synchronous transmission of the multiple paths of signals is realized.
The ground monitoring platform 111 comprises a data processing unit 103; the ground monitoring platform 111 is a state monitoring platform implemented based on an IEC61850 protocol, and the platform adopts a C/S architecture and is responsible for access and management of a series compensation device and motion control of the whole online monitoring system.
As shown in fig. 3, the monitoring method implemented on the ground monitoring platform 111 includes the following steps:
step A: the micro-current transformer 105 and the first voltage divider 106a collect leakage current and voltage of the multiple sets of voltage limiter units 104, respectively, and transmit the collected signals to the data collection board card 107;
and B: the data acquisition board card 107 transmits the acquired leakage current signal and voltage signal to the data processing unit 103 through the optical fiber signal transmission unit 102;
and C: the data processing unit 103 analyzes and processes the leakage current signal and the voltage signal, and specifically includes steps C1 to C3:
step C1: the data processing unit 103 calculates the collected leakage current signal and voltage signal of the voltage limiter unit 104 by applying a fast fourier transform and a bimodal interpolation algorithm based on a Blackman-Harris window;
the cosine window of the Blackman-Harris window is generally expressed as:
a k the number of items of the cosine window, and N is the number of sampling points;
values of different K and coefficient a k Different windows are determined: when K =0, it is a rectangular window; when K =1, a 0 ＝0.54，a 1 =0.46, hamming window, a 0 ＝a 1 =0.5 for haining window; k =3, take a 0 ＝0.35875,a 1 ＝0.48829,a 2 ＝14128,a 3 =0.01168 is the blackman-harris window;
calculating fundamental wave and third harmonic component parameters, and performing two-peak difference value operations with the central frequency of 50Hz and 150Hz on the leakage current signal of the voltage limiter unit 104, wherein the components of other frequencies are ignored due to less occupation ratio; after the calculation is finished, the fundamental current amplitude I can be obtained 1 Phase of fundamental current θ i1 Third harmonic current amplitude I 3 Third harmonic current phase θ i3 (ii) a The full current amplitude I can be calculated by the sum of squares of the amplitudes of the harmonics.
The voltage signal measured by the first voltage divider 106a is subjected to a double-peak difference operation to obtain a fundamental wave phase theta u1 The fundamental resistive current I can be obtained r1 ：
I r1 ＝I 1 cos(θ u1 -θ i1 )
The third harmonic component of the resistive current is in phase opposition with the fundamental component of the resistive current, and the amplitude I of the third harmonic component of the resistive current r3 The calculation formula is as follows:
I r3 ＝I 3 cos(θ u1 +180°-θ i3 )
and step C2: using harmonic analysis, i.e. by fundamental resistive current I r1 And resistive current third harmonic component amplitude I r3 The operating conditions of the sets of voltage limiter units 104 are determined: when the valve plate of the voltage limiter is aged, the third harmonic component amplitude I of the resistive current r3 Will increase significantly; when the interior of the voltage limiter is affected with tide, the fundamental wave resistive current I r1 A significant increase; the harmonic analysis method can be combined with a capacitance current compensation method and the like.
And C3: differential comparison is carried out on the leakage current signals of the multiple groups of voltage limiters 104 respectively, and the fault voltage limiters 104 are positioned; the differential comparison of the leakage current signals of the multiple sets of voltage limiters 104 is respectively carried out for eliminating the environmental electromagnetic interference and temperature drift influence and improving the measurement precision, because the probability of the simultaneous occurrence of the problems of the multiple sets of voltage limiters 104 is lower, if a certain voltage limiter 104 has a fault and the leakage current parameter exceeds the set threshold or has a larger difference with the measurement data of other sets of voltage limiters 104, the monitoring system is positioned as the faultThe voltage limiter unit 104 starts a fault alarm to remind the operator of timely maintenance, such as the fundamental resistive current I r1 The leakage current parameter exceeds a set threshold value; if the fault alarm accuracy is further improved, after the fault voltage limiter unit 104 is positioned, the history records and the environmental parameters of the positioned voltage limiter unit 104 and the voltage limiter unit 104 in the database are analyzed and compared, fault analysis and fault evaluation are carried out, and then whether the fault alarm is started or not is determined.
Meanwhile, the ground monitoring platform 111 has a front end setting function, and can set an on-line monitoring and inspection unit acquisition period, an alarm threshold value and the like through the front end.
According to the method, the collected leakage current signals and voltage signals of the voltage limiter unit 104 are calculated through a Blackman-Harris window-based fast Fourier transform and a bimodal interpolation algorithm, and the calculated parameters are analyzed and early warned, so that the monitoring accuracy of the voltage limiter is improved, and the stability of an extra-high voltage power grid system and an extra-high voltage power grid system is enhanced.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A state monitoring system of a voltage limiter in an extra-high voltage series compensation device is characterized in that: the system comprises a data acquisition unit, a ground monitoring platform and an optical fiber signal transmission unit, wherein the data acquisition unit is used for acquiring leakage current and voltage of a plurality of groups of voltage limiter units in an ultra-high voltage and extra-high voltage power grid; the multiple groups of voltage limiter units comprise two column voltage limiters which are connected in parallel between the high-voltage bus and the low-voltage bus; the data acquisition unit comprises a first voltage divider for acquiring the voltage of the voltage limiter unit, a voltage limiter measuring box and a plurality of micro-current transformers for acquiring the leakage current of the voltage limiter unit; the voltage limiter measuring box comprises an electromagnetic shielding shell and a data acquisition board card arranged in the electromagnetic shielding shell; the ground monitoring platform comprises a data processing unit; the signal acquisition ends of the micro-current transformers are respectively connected with the current signal output ends of the multiple groups of voltage limiter units, and the signal output ends of the micro-current transformers are connected with the signal input end of the data acquisition board card; the signal acquisition end of the first voltage divider is respectively connected with the voltage signal output ends of the multiple groups of voltage limiter units, and the signal output end of the first voltage divider is connected with the signal input end of the data acquisition board card.
2. The system for monitoring the state of the voltage limiters in the extra-high and extra-high voltage series compensation device according to claim 1, is characterized in that: the two column voltage limiters in each group of voltage limiter units are connected in parallel through an aluminum bar, and two ends of the aluminum bar are respectively connected to the bottom plates of the two column voltage limiters.
3. The system for monitoring the state of the voltage limiters in the extra-high and extra-high voltage series compensation device according to claim 2 is characterized in that: a connecting wire is led out from the bottom plate of any one column voltage limiter in each group of voltage limiter units and connected to a low-voltage bus bar, the signal acquisition end of the micro-current transformer is connected with the connecting wire, and the high-voltage wiring ends of two column voltage limiters in each group of voltage limiter units are connected to a high-voltage bus bar.
4. A state monitoring system of a voltage limiter in an extra-high voltage series compensation device according to any one of claims 1 to 3, characterized in that: the optical fiber signal transmission unit comprises an optical fiber column and two photoelectric conversion modules arranged at two ends of the optical fiber column respectively, and the two photoelectric conversion modules are connected with the signal transmission interfaces of the data acquisition board card and the data processing unit respectively.
5. The system for monitoring the state of the voltage limiters in the ultra-high voltage and extra-high voltage series compensation device as claimed in claim 4, wherein: the high-voltage bus and the low-voltage bus are connected with the data acquisition board card through the data acquisition unit, and the data acquisition unit is connected with the data acquisition board card through the data acquisition board card.
6. The system for monitoring the state of the voltage limiters in the extra-high and extra-high voltage series compensation device according to claim 5, is characterized in that: and the voltage input end of the data acquisition board card is provided with a current-limiting and voltage-limiting protection module for preventing surge current from damaging the data acquisition board card.
7. The monitoring method of the condition monitoring system of the voltage limiters in the extra-high and extra-high voltage series compensation device according to any one of claims 1 to 6 is characterized by comprising the following steps:
step A: the micro-current transformer and the first voltage divider respectively collect leakage current and voltage of the voltage limiter unit and transmit collected signals to the data collection board card;
and B: the data acquisition board transmits the acquired leakage current signal and voltage signal to the data processing unit through the optical fiber signal transmission unit;
and C: the data processing unit analyzes and processes the leakage current signal and the voltage signal, and specifically comprises the following steps of C1-C3:
step C1: the data processing unit calculates the collected leakage current signal and voltage signal of the voltage limiter unit by applying a fast Fourier transform and a bimodal interpolation algorithm based on a Blackman-Harris window;
the cosine window of the Blackman-Harris window is generally expressed as:
a k is the number of terms of the cosine window, N is the number of sampling points, K =3,a 0 ＝0.35875，a 1 ＝0.48829，a 2 ＝14128，a 3 ＝0.01168；
Calculating fundamental wave and third harmonic component parameters, performing double-peak difference operation on leakage current signals of the voltage limiter unit, and obtaining a fundamental wave current amplitude I after calculation 1 Phase of fundamental current θ i1 Third harmonic current amplitude I 3 Third harmonic current phase θ i3 (ii) a The full current amplitude I can be obtained by calculating the square sum of the amplitudes of each subharmonic;
performing double-peak difference operation on the voltage signal measured by the first voltage divider to obtain a fundamental wave phase theta u1 The fundamental resistive current I can be obtained r1 ：
I r1 ＝I 1 cos(θ u1 -θ i1 )
The third harmonic component of the resistive current is in reverse phase with the fundamental component of the resistive current, and the amplitude I of the third harmonic component of the resistive current r3 The calculation formula is as follows:
I r3 ＝I 3 cos(θ u1 +180°-θ i3 )
and step C2: using harmonic analysis, i.e. by fundamental resistive current I r1 And resistive current third harmonic component amplitude I r3 The operating conditions of the multiple groups of voltage limiter units are judged by the change of the voltage limiter units: when the valve plate of the voltage limiter is aged, the third harmonic component amplitude I of the resistive current r3 Will increase significantly; when the interior of the voltage limiter is affected by tide, the fundamental wave resistive current I r1 A significant increase;
and C3: respectively carrying out differential comparison on leakage current signals of the multiple groups of voltage limiter units and positioning the fault voltage limiter units; because the probability of problems occurring in multiple groups of voltage limiter units at the same time is low, if a certain voltage limiter unit has a fault, the leakage current parameter of the certain voltage limiter unit exceeds a set threshold value or has a large difference with the measurement data of other groups of voltage limiter units, the monitoring system is positioned as the fault voltage limiter unit, and a fault alarm is started to remind a worker of timely maintaining the voltage limiter unit.
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| CN108008171B (en) * | 2017-12-29 | 2023-09-01 | 深圳市锐能微科技有限公司 | Circuit parameter detection circuit and electric energy meter |
| CN108462617A (en) * | 2018-05-09 | 2018-08-28 | 北京国网普瑞特高压输电技术有限公司 | A kind of series compensation device state on_line monitoring system |
| CN108899993A (en) * | 2018-05-09 | 2018-11-27 | 北京国网普瑞特高压输电技术有限公司 | Voltage limiter status monitoring subsystem based on series compensation state on_line monitoring system |
| CN109061275A (en) * | 2018-05-23 | 2018-12-21 | 中国电力科学研究院有限公司 | A kind of distributed On-line Monitoring of Leakage Current method and system of series compensation device voltage limiter |
| CN109976142A (en) * | 2019-05-08 | 2019-07-05 | 阳光电源股份有限公司 | A kind of sensor shared system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203012039U (en) * | 2012-11-16 | 2013-06-19 | 四川电力科学研究院 | Online monitoring device for voltage limiter in series compensation capacitor |
| CN103869183A (en) * | 2014-02-07 | 2014-06-18 | 国电南瑞科技股份有限公司 | Online monitoring system and method of zinc oxide arrester |
| CN205786925U (en) * | 2016-07-01 | 2016-12-07 | 国网江苏省电力公司宿迁供电公司 | A kind of Zinc-Oxide Arrester on-line monitoring and the diagnostic equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044524B (en) * | 2015-08-10 | 2018-12-04 | 许继集团有限公司 | A kind of arrester monitoring method and system suitable for intelligent substation |
-
2017
- 2017-07-11 CN CN201710561024.8A patent/CN107247204B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203012039U (en) * | 2012-11-16 | 2013-06-19 | 四川电力科学研究院 | Online monitoring device for voltage limiter in series compensation capacitor |
| CN103869183A (en) * | 2014-02-07 | 2014-06-18 | 国电南瑞科技股份有限公司 | Online monitoring system and method of zinc oxide arrester |
| CN205786925U (en) * | 2016-07-01 | 2016-12-07 | 国网江苏省电力公司宿迁供电公司 | A kind of Zinc-Oxide Arrester on-line monitoring and the diagnostic equipment |
Non-Patent Citations (1)
| Title |
|---|
| 基于MSP430的避雷器实时监测***的设计;朱亮等;《电子设计工程》;20111205(第23期);全文 * |
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