CN201726118U - Harmonic protection device for capacitor - Google Patents
Harmonic protection device for capacitor Download PDFInfo
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- CN201726118U CN201726118U CN 201020164208 CN201020164208U CN201726118U CN 201726118 U CN201726118 U CN 201726118U CN 201020164208 CN201020164208 CN 201020164208 CN 201020164208 U CN201020164208 U CN 201020164208U CN 201726118 U CN201726118 U CN 201726118U
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Abstract
The utility model relates to a harmonic protection device for a capacitor, which can complete protection of the conventional capacitor as well as harmonic monitoring and protection of a capacitor set. The harmonic protection device comprises a current and voltage sampling unit, a central processing unit (CPU), a first circuit breaker, a switching value input unit, a second circuit breaker and a switching value output unit, wherein the current and voltage sampling unit is used for performing current and voltage sampling on the analog input of the capacitor set at a fixed sampling frequency; the CPU calculates harmonic components in a three-phase voltage channel and a current channel of the capacitor set by a fast Fourier transform (FFT) algorithm in real time; the switching value input unit is used for isolating the position information of a switch; the second circuit breaker is connected with the CPU and used for switching the capacitor set off; and the switching value output unit is used for isolating the switch.
Description
Technical field
The utility model relates to the protective device of the power capacitor in the electric power system, specifically is a kind of capacitor harmonic protection device.
Background technology
In recent years, along with the extensive use of power system development and power electronic technology, great variation has taken place in the structure of power load.The operation of a large amount of nonlinear-loads such as arc furnace, electric railway, thyristor voltage regulation and frequency conversion adjusting device becomes main harmonic source in the electrical network, injects a large amount of harmonic currents to electric power system, causes the voltage waveform distortion of electrical network.Harmonic wave has produced influence in various degree to the normal operation of the various electric equipments in the electrical network, and is wherein especially serious to the influence of capacitor.Mainly show the following aspects: the electric energy loss that has strengthened capacitor loops; Capacitor loops produces resonance; Harmonic current amplifies; Shortening capatcitor useful life.
Operating experience proves that capacitor group and series reactor are subjected to the degree of mains by harmonics harm that zooming trend is arranged, and the capacitor group and the series reactor firing accident of electric substation frequently take place.At present capacitor protection one differential pressure, difference stream, overcurrent protection and overvoltage, protection such as under-voltage are set, but the equal first-harmonic of a measuring voltage and electric current of these protections does not react harmonic wave, does not have the harmonic protection function.How to realize harmonic measure, and send alarm signal or tripping capacitor switch when harmonic wave harm is serious, thereby realize the capacitor harmonic protection, to avoid the damage of capacitor group, the accident of preventing spreads or enlarges, and is the technical barrier that this area will solve.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of capacitor harmonic protection device that in real time the capacitor group is carried out harmonic wave supervision and protection.
For solving the problems of the technologies described above, the utility model provides a kind of capacitor harmonic protection device, comprise: the analog quantity input to the capacitor group is carried out electric current with fixing sample frequency, the current-voltage sampling unit 21 of voltage sample, adopt the CPU 20 of each harmonic component in FFT fast algorithm real-time calculable capacitor group three-phase voltage passage and the current channel, the circuit breaker that is used to monitor described capacitor group that links to each other with CPU 20, the switching value input unit 24 of the positional information of isolation switch, the circuit breaker that is used to cut off described capacitor group that links to each other with CPU20, the switching value output unit 25 of isolation switch; The output of described current-voltage sampling unit 21 links to each other with CPU20.
Further, described switching value input unit 24 is made of light-coupled isolation and filter circuit.
Further, described CPU20 comprises: analog-to-digital conversion module, microprocessor module, IO driver module, be used to connect user-machine interface 23 human-computer interface module, be used to connect the background communication module of communication interface 22.
Further, described analog-to-digital conversion module is the analog acquisition system that the A/D converter by the passive anti-aliasing low-pass filtering of Order RC and 16,6 road synchronized samplings constitutes.
Further, described microprocessor module is a dual-core architecture.
Further, described switching value output unit 25 comprises starting relay, actuating relay and the signal relay that links to each other with CPU20.
The utlity model has positive effect: when (1) capacitor harmonic protection of the present utility model device uses; whether the real-time calculable capacitor group of CPU is in harmonic wave overcurrent, overvoltage condition; when described capacitor group is in harmonic wave overvoltage or overcurrent, cut off described capacitor group.(2) the utility model utilizes the each harmonic component in configuration software realization capacitor bank protection observing and controlling logic and fft algorithm calculable capacitor group voltage and the current channel; use high-performance CPU (model is MPC8247) as microprocessor, realize conventional capacitor protection of capacitor group and harmonic wave defencive function.By computer technology and embedded system technology, the harmonic wave of system of living in the capacitor group running is contained level comprehensively monitor, in conjunction with capacitor group safe operation parameter, provide the protection and the monitoring scheme that guarantee the reliable and secure operation of capacitor group.Adopt the storage of big capacity storage and subregion, on the basis that does not influence capacitor GPF (General Protection False function, realize the storage of harmonic protection and GPF (General Protection False data; Adopt USB interface technology and ethernet communication or serial communication technology, be convenient to realize the collection of data.Capacitor group harmonic protection measure and control device hardware platform of the present utility model has high-performance, versatility, economy, anti-interference, extensibility; computed in software machine configuration technology realizes protection, observing and controlling, communicating integral function; simple in structure; can better adapt to the requirement of electric power system capacitor bank protection; improved capacitor group reliability of operation; simultaneously, be easy to installation and debugging.
Description of drawings
For the easier quilt of content of the present utility model is clearly understood, below the specific embodiment and in conjunction with the accompanying drawings of basis, the utility model is described in further detail, wherein Fig. 1 is the electrical block diagram of the temperature measuring equipment among the embodiment.
Embodiment
The capacitor harmonic protection device of seeing Fig. 1 present embodiment comprises: the current-voltage sampling unit 21 that the analog quantity input of capacitor group is carried out electric current, voltage sample with fixing sample frequency, adopt the CPU20 of each harmonic component in FFT fast algorithm real-time calculable capacitor group three-phase voltage passage and the current channel, the switching value output unit 25 of the switching value input unit 24 of the circuit breaker that is used to monitor described capacitor group that links to each other with CPU20, the positional information of isolation switch, the circuit breaker that is used to cut off described capacitor group that links to each other with CPU20, isolation switch; The output of described current-voltage sampling unit 21 links to each other with CPU20.
Described CPU20 comprises: analog-to-digital conversion module, microprocessor module, IO driver module, be used to connect user-machine interface 23 human-computer interface module, be used to connect the background communication module of communication interface 22.CPU20 adopts 32 risc processor MP8247 of high-performance of FreeScale company as microprocessor, and it has functions such as analog-to-digital conversion, microprocessor, IO driving, protection algorithm, definite value incident management, failure wave-recording, man-machine interface, background communication and USB HOST interface.
Electric current, voltage signal are gathered in current-voltage sampling unit 21, through sending into the change-over circuit of A/D behind the RC Filtering Processing circuit.Current-voltage sampling unit 21 is made of signal conditioning circuit and A/D change-over circuit; Adopt CT, PT all to convert electric current, voltage signal to the voltage small-signal respectively in the signal conditioning circuit, after filter circuit is handled, send into the A/D modular converter of CPU20 again.
Described switching value input unit 24 is made of light-coupled isolation and filter circuit.220V or 110V forceful electric power are opened into amount and are sent into filter circuit through the signal of telecommunication of light-coupled isolation output, to prevent to open anti-shake into the amount signal, increase to disappear simultaneously in software and tremble algorithm, satisfy rapidity and reliability requirement.
Described switching value output unit 25 comprises starting relay, actuating relay and the signal relay that links to each other with CPU20.Switching value output unit 25 is by many mouthful line traffic controls of CPU, and the anti-interference of intensifier avoids leaving the loop mistaking signal, and the whole module of leaving is made up of multicircuit relay.
Described analog-to-digital conversion module is the analog acquisition system that the A/D converter by the passive anti-aliasing low-pass filtering of Order RC and 16,6 road synchronized samplings constitutes.
The capacitor harmonic protection device of present embodiment is based on the device of configuration software and fft algorithm, and described configuration software comprises resources configuration management and function logic configuration tool, and soft, the hardware resource to device is configured and is provided with respectively; By calling the configuration file that the resources configuration management instrument generates and the power function module library of customization, build protection, observing and controlling function logic block, final generation is downloaded to the binary executable of CPU master control module." function logic configuration tool ", the editor who realizes logic diagram, logic diagram is dissolved in proper order and is analysed; the editor of algorithmic code, the management of logic diagram and algorithm component library, logic diagram is changed the following biography of sequence in proper order; the protection logic diagram of device and the preservation and the recovery of algorithm, the functions such as debugging of protection algorithm.This software is through logical abstraction, disengaging particular hardware platform, being applied to new hardware platform later on, this software need not be developed again, can directly use." resources configuration management instrument " shines upon and disposes the abstract logic sign that defines in device software and hardware resources and " function logic configuration tool " software, and under pass to device.
Obviously, above-mentioned case study on implementation only is for the utility model example clearly is described, and is not to be qualification to execution mode of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all execution modes.And these belong to conspicuous variation or the change that spirit of the present utility model extended out and still are among the protection range of the present utility model.
Claims (6)
1. capacitor harmonic protection device, it is characterized in that comprising: the analog quantity input to the capacitor group is carried out electric current with fixing sample frequency, the current-voltage sampling unit (21) of voltage sample, adopt the CPU (20) of each harmonic component in FFT fast algorithm real-time calculable capacitor group three-phase voltage passage and the current channel, the circuit breaker that is used to monitor described capacitor group that links to each other with CPU (20), the switching value input unit (24) of the positional information of isolation switch, the circuit breaker that is used to cut off described capacitor group that links to each other with CPU (20), the switching value output unit (25) of isolation switch; The output of described current-voltage sampling unit (21) links to each other with CPU (20).
2. a kind of capacitor harmonic protection device according to claim 1, it is characterized in that: described switching value input unit (24) is made of light-coupled isolation and filter circuit.
3. a kind of capacitor harmonic protection device according to claim 1, it is characterized in that: described CPU (20) comprising: analog-to-digital conversion module, microprocessor module, IO driver module, be used to connect user-machine interface (23) human-computer interface module, be used to connect the background communication module of communication interface (22).
4. a kind of capacitor harmonic protection device according to claim 3 is characterized in that: described analog-to-digital conversion module is the analog acquisition system that the A/D converter by the passive anti-aliasing low-pass filtering of Order RC and 16,6 road synchronized samplings constitutes.
5. a kind of capacitor harmonic protection device according to claim 4, it is characterized in that: described microprocessor module is a dual-core architecture.
6. a kind of capacitor harmonic protection device according to claim 1, it is characterized in that: described switching value output unit (25) comprises starting relay, actuating relay and the signal relay that links to each other with CPU (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020164208 CN201726118U (en) | 2010-04-20 | 2010-04-20 | Harmonic protection device for capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020164208 CN201726118U (en) | 2010-04-20 | 2010-04-20 | Harmonic protection device for capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201726118U true CN201726118U (en) | 2011-01-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201020164208 Expired - Fee Related CN201726118U (en) | 2010-04-20 | 2010-04-20 | Harmonic protection device for capacitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201726118U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012075725A1 (en) * | 2010-12-10 | 2012-06-14 | 江苏省电力公司常州供电公司 | Harmonic wave protecting method for capacitor bank |
| CN102738773A (en) * | 2012-06-06 | 2012-10-17 | 河南省电力公司信阳供电公司 | Adaptive capacitor bank protection device |
-
2010
- 2010-04-20 CN CN 201020164208 patent/CN201726118U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012075725A1 (en) * | 2010-12-10 | 2012-06-14 | 江苏省电力公司常州供电公司 | Harmonic wave protecting method for capacitor bank |
| CN102738773A (en) * | 2012-06-06 | 2012-10-17 | 河南省电力公司信阳供电公司 | Adaptive capacitor bank protection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110126 Termination date: 20170420 |
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| CF01 | Termination of patent right due to non-payment of annual fee |