CN202330523U - Capacitive sampling voltage box for voltage quality monitoring of 220kV power system - Google Patents
Capacitive sampling voltage box for voltage quality monitoring of 220kV power system Download PDFInfo
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- CN202330523U CN202330523U CN2011204549236U CN201120454923U CN202330523U CN 202330523 U CN202330523 U CN 202330523U CN 2011204549236 U CN2011204549236 U CN 2011204549236U CN 201120454923 U CN201120454923 U CN 201120454923U CN 202330523 U CN202330523 U CN 202330523U
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Abstract
The utility model provides a capacitive sampling voltage box for voltage quality monitoring of a 220kV power system. The capacitive sampling voltage box comprises a voltage dividing capacitor, a ground switch, a gas-discharge tube, a matched resistor, an input terminal, an output terminal and a ground terminal, wherein the voltage dividing capacitor, the ground switch and the gas-discharge tube are respectively connected in parallel to two ends of both the input terminal and the ground terminal; the ends of the voltage capacitor, the ground switch and the gas-discharge tube, which are connected with the input terminal, are connected with one end of the output terminal through the matched resistor; and the other end of the output terminal is connected with the ground terminal. Through the capacitive sampling voltage box, the utility model radically avoids the influence on monitoring errors from the sensing link during voltage harmonic monitoring of the 220KV system, and provides a convenient, safe, reliable and accurate data acquisition scheme for the voltage harmonic measurement.
Description
Technical field
The utility model relates to a kind of 220kV power system voltage quality monitoring and uses the capacitor sampling volt box; Be that equipment is used in the monitoring of common network voltage harmonic in a kind of quality of power supply supervision work; Use with the 220KV electric system of using capacitance type potential transformer in, as the sensor special of voltage harmonic test.
Background technology
GB GB/T14549-93 " quality of power supply common network harmonic wave " has stipulated the permissible value and the method for testing thereof of utility network harmonic wave; Appendix D7 has made regulation to the harmonic measure sensing equipment: in the frequency range of measuring; Harmonic wave such as instrument transformer, condenser divider sensing equipment should have good frequency characteristic; The amplitude error of its introducing should be greater than 5%, and phase angle error is not more than 5 °.When not having definite frequency response error characteristic, current transformer and low voltage voltage mutual inductor are used for 2500Hz and reach the harmonic measure with lower frequency; 6～110kV electromagnetic potential transformer can be used for 1000Hz and following frequency measurement; Capacitance type potential transformer can not be used for harmonic measure.In harmonic voltage measurement, when overtone order or measuring accuracy are had higher the needs, should adopt resitstance voltage divider (UN＜1kV) or capacitive divider (UN >=1kV).
The 220kV system capacitance type potential transformer (TVC) that is widely used; And the frequency response of TVC is not linear; Caused the secondary side voltage harmonic in some in-band signal distortion, can not reflect the voltage harmonic of primary system truly, so TVC can not be used for the voltage harmonic measurement.During the measuring voltage harmonic wave, can adopt capacitive divider in this case, perhaps utilize the end screen capacitances in series dividing potential drop electric capacity of a winding High-Voltage Insulation of current transformer electric capacity to constitute capacitive divider as sensing equipment as sensing equipment.
The frequency characteristic of the harmonic wave sensing equipment of employing capacitive divider principle is better; Special-purpose capacitive divider need increase primary equipment; Rigging up and debugging maintenance workload large period is long; And current transformer end screen series connection dividing potential drop electric capacity constitutes the method for capacitive divider, safeguards that because of it drops into little Installation and Debugging convenient quilt extensively adopts.But when existing employing end screen series connection dividing potential drop capacitive method is measured; Testing crew all is rule of thumb to assemble voltage-dividing capacitor; The selection of capacitor, the setting of protection, the adaptive faculty of outdoor environment is varied with each individual, therefore safe and reliable, sampled data accurately can't be provided.
Summary of the invention
The utility model is the safe reliability and the relatively poor problem of accuracy of the image data of the harmonic wave sensing equipment existence of the existing employing capacitive divider principle of solution, and then provides a kind of 220kV power system voltage quality monitoring to use the capacitor sampling volt box.
The purpose of the utility model realizes through following technical scheme:
A kind of 220kV power system voltage quality monitoring is used the capacitor sampling volt box; Comprise dividing potential drop electric capacity, ground connection disconnecting link, gas-discharge tube, build-out resistor, input terminal, lead-out terminal and ground terminal; Said dividing potential drop electric capacity, ground connection disconnecting link and gas-discharge tube are connected in parallel on the two ends of said input terminal and ground terminal respectively; The end that said dividing potential drop electric capacity, ground connection disconnecting link and gas-discharge tube are connected with said input terminal also is connected with an end of said lead-out terminal through said build-out resistor, and the other end of said lead-out terminal is connected with said ground terminal.
The utility model is through capacitor sampling volt box provided by the invention; The sensing link is to the influence of monitoring error, for this type of voltage harmonic measurement provides a kind of convenience, safety, reliable, accurate data acquisition scheme in the time of thoroughly solving 220KV system voltage harmonic monitoring.
Description of drawings
Fig. 1 and Fig. 2 are the structural representation of a kind of 220kV power system voltage quality monitoring of providing of the embodiment of the utility model with the capacitor sampling volt box;
Fig. 3 is the 220kV system three-phase voltage waveform synoptic diagram of this capacitor sampling voltage divider actual measurement of the use that provides of the embodiment of the utility model.
Embodiment
To combine accompanying drawing that the utility model is done further detailed description below: present embodiment provided detailed embodiment, but the protection domain of the utility model is not limited to following embodiment being to implement under the prerequisite with the utility model technical scheme.
As depicted in figs. 1 and 2; A kind of 220kV power system voltage quality monitoring that this embodiment provides is used the capacitor sampling volt box; Comprise dividing potential drop electric capacity 1, ground connection disconnecting link 2, gas-discharge tube 3, build-out resistor 4, input terminal 5, lead-out terminal 6 and ground terminal 7; Dividing potential drop electric capacity 1, ground connection disconnecting link 2 and gas-discharge tube 3 are connected in parallel on the two ends of input terminal 5 and ground terminal 7 respectively; The end that dividing potential drop electric capacity 1, ground connection disconnecting link 2 and gas-discharge tube 3 are connected with input terminal 5 also is connected with an end of lead-out terminal 6 through build-out resistor 4, and the other end of lead-out terminal 6 is connected with ground terminal 7.
Dividing potential drop electric capacity 1, ground connection disconnecting link 2, gas-discharge tube 3, build-out resistor 4, input terminal 5, lead-out terminal 6 and ground terminal 7 all are arranged in the casing 8; One end of input terminal 5 also with the high voltage capacitive-type Insulated Current Transformers in high-voltage capacitance be connected.Fixed support is used for 220kV power system voltage quality monitoring is fixed on the capacitor sampling volt box cement support of high-tension current inductor.
Concrete, high voltage capacitive-type Insulated Current Transformers end screen is through being not less than 16mm
2Connecting line is received input terminal in the casing 8; Ground terminal 7 in the casing 8 is connected with switch yard grounded screen through the ground wire in same cross section; Lead-out terminal 6 in the casing 8 is an aviation plug, is connected cable outer layer shielding both sides ground connection with harmonic measuring device through the double layer screen cable.
When the ground connection disconnecting link 2 in the casing 8 is closed, CT end screen and the direct short circuit of earth terminal, harmonic monitoring dividing potential drop sampling loop is not carried out harmonic measure by bypass; When ground connection disconnecting link 2 broke off, serial connection was gone into harmonic monitoring dividing potential drop sampling loop, and the output measurement voltage signal is carried out harmonic measure.
Characteristic according to capacitance partial pressure; Voltage U on voltage on the dividing potential drop electric capacity 1 and the 220KV circuit is linearly proportional; Suitably select the capacity of dividing potential drop electric capacity 1; Make
(electric harmonic analyser input voltage range 0～380V); Can obtain to satisfy the voltage harmonic signal U2 that monitoring requires, this signal causes the lead-out terminal 6 in the casing 8.
220KV capacitive insulation IOSK245 type current transformer like the production of legend electric (Shenyang) company limited; Its high-voltage capacitance value can get
its dividing potential drop electric capacity according to following formula and can select 1uf about 300pf.
The capacitor sampling volt box is used on the 220KV electric pressure, jeopardizes the person and device security for preventing high voltage, between voltage harmonic signal and ground wire, leaves gas-discharge tube, and gas-discharge tube nominal operation voltage is 350V.
Build-out resistor 4 can be selected precision resister for use, to realize the harmless transmission of harmonic signal, R=5.1k Ω.
Concrete connected mode, mounting structure are as follows:
(1) the capacitor sampling volt box utilizes servicing machine can be connected to the high-tension current inductor end; The high-tension current inductor ground connection disconnecting link that need have a power failure and close; The capacitor sampling volt box is answered reliable ground; The earth terminal of dividing potential drop capacitor C 2 should reliably be connected with the capacitor sampling volt box, and connecting line and ground wire cross section are not less than 16mm
2, ready for measuring later on.
When (2) not measuring, the ground connection disconnecting link closes all the time.
(3) damage instrument, the ground connection disconnecting link that closes earlier, isolation measurement signal when preventing system operation.When treating that the operation completion possesses the monitoring condition, open the ground connection disconnecting link, insert instrument.
(4) extension line of measuring uses the double layer screen cable, the two-terminal-grounding of external shielding layer.
Forbid to open earth point when (5) equipment under test moves.
220kV system capacitance type insulation system current transformer in this embodiment; Zero screen links to each other with a winding; Ground connection is shielded at the end, and the master between zero screen and the end screen is shielded capacitor, can be used as the high-voltage capacitance of capacitive divider; Insert dividing potential drop electric capacity as measurement electric capacity in its end screen series connection, thereby constitute condenser divider.Press signal from measuring the power taking of electric capacity two ends, behind signal condition, insert harmonic measuring device, can obtain reliable harmonic wave test data.
This embodiment is used when certain 220KV of oil field cogeneration plant system voltage harmonic monitoring; Use the 220kV system three-phase voltage waveform of this capacitor sampling voltage divider actual measurement as shown in Figure 3, use the 220kV bus quality of power supply harmonic measure data of this capacitor sampling voltage divider actual measurement as shown in the table:
The technical scheme that adopts this embodiment to provide; Through capacitor sampling volt box provided by the invention; The sensing link is to the influence of monitoring error, for this type of voltage harmonic measurement provides a kind of convenience, safety, reliable, accurate data acquisition scheme in the time of thoroughly solving 220KV system voltage harmonic monitoring.
The above; Be merely the preferable embodiment of the utility model; These embodiments all are based on the different implementations under the utility model general idea, and the protection domain of the utility model is not limited thereto, and any technician who is familiar with the present technique field is in the technical scope that the utility model discloses; The variation that can expect easily or replacement all should be encompassed within the protection domain of the utility model.Therefore, the protection domain of the utility model should be as the criterion with the protection domain of claims.
Claims (2)
1. a 220kV power system voltage quality monitoring is used the capacitor sampling volt box; It is characterized in that; Comprise dividing potential drop electric capacity, ground connection disconnecting link, gas-discharge tube, build-out resistor, input terminal, lead-out terminal and ground terminal; Said dividing potential drop electric capacity, ground connection disconnecting link and gas-discharge tube are connected in parallel on the two ends of said input terminal and ground terminal respectively; The end that said dividing potential drop electric capacity, ground connection disconnecting link and gas-discharge tube are connected with said input terminal also is connected with an end of said lead-out terminal through said build-out resistor, and the other end of said lead-out terminal is connected with said ground terminal.
2. 220kV power system voltage quality monitoring according to claim 1 is used the capacitor sampling volt box; It is characterized in that said dividing potential drop electric capacity, ground connection disconnecting link, gas-discharge tube, build-out resistor, input terminal, lead-out terminal and ground terminal all are arranged in the casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204549236U CN202330523U (en) | 2011-11-16 | 2011-11-16 | Capacitive sampling voltage box for voltage quality monitoring of 220kV power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204549236U CN202330523U (en) | 2011-11-16 | 2011-11-16 | Capacitive sampling voltage box for voltage quality monitoring of 220kV power system |
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| Publication Number | Publication Date |
|---|---|
| CN202330523U true CN202330523U (en) | 2012-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204549236U Expired - Fee Related CN202330523U (en) | 2011-11-16 | 2011-11-16 | Capacitive sampling voltage box for voltage quality monitoring of 220kV power system |
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| CN (1) | CN202330523U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112986667A (en) * | 2021-02-22 | 2021-06-18 | 国网陕西省电力公司电力科学研究院 | Voltage digital signal measuring method and system for CVT voltage quality measurement |
-
2011
- 2011-11-16 CN CN2011204549236U patent/CN202330523U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112986667A (en) * | 2021-02-22 | 2021-06-18 | 国网陕西省电力公司电力科学研究院 | Voltage digital signal measuring method and system for CVT voltage quality measurement |
| CN112986667B (en) * | 2021-02-22 | 2024-02-23 | 国网陕西省电力公司电力科学研究院 | Voltage digital signal measuring method and system for CVT voltage quality measurement |
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| Date | Code | Title | Description |
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| 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: 20120711 Termination date: 20201116 |
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| CF01 | Termination of patent right due to non-payment of annual fee |