CN203941238U - A kind of 35kV high-voltage bridging capacitor group dielectric loss on-line monitoring device - Google Patents
A kind of 35kV high-voltage bridging capacitor group dielectric loss on-line monitoring device Download PDFInfo
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- CN203941238U CN203941238U CN201420357110.9U CN201420357110U CN203941238U CN 203941238 U CN203941238 U CN 203941238U CN 201420357110 U CN201420357110 U CN 201420357110U CN 203941238 U CN203941238 U CN 203941238U
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Abstract
The utility model discloses a kind of 35kV high-voltage bridging capacitor group dielectric loss on-line monitoring device, comprise the 1st to the 9th current sensor, current conversion circuit, voltage conversion circuit, analog-to-digital conversion module, microprocessor, display, keyboard and power module; Its beneficial effect is: while using the utility model, without having a power failure, can understand the operation conditions of power capacitor bank, reduce the harmful effect that equipment has a power failure to client and power supply reliability, avoid numerous and diverse disconnecting link blocked operation; The utility model suits power capacitor bank operation and maintenance condition more, and it can find insulation defect in time, improves the validity of monitoring; The utility model can reflect the running status of power capacitor bank in real time, to scenting a hidden danger in time, prevent accident of power supply, guarantee that safe power supply plays a good role and overcome the blindness that traditional preventive trial brings.
Description
Technical field
The utility model belongs to electric system high-voltage power capacitor monitoring technical field, relates to a kind of 35kV high-voltage bridging capacitor group dielectric loss on-line monitoring device.
Background technology
High-voltage parallel capacitor group device is reactive power source very important in current electric system, for improving NETWORK STRUCTURE PRESERVING POWER SYSTEM, improves the quality of power supply and plays a part very important.Main Function is for electric system provides reactive power, reduces line loss, improves quality of voltage, improves plant factor.Power capacitor is as a kind of reactive-load compensation equipment, transformer station adopts the mode of high pressure centralized compensation conventionally, compensation condenser is connected on the 10kV of transformer station or 35kV bus, reactive power on the compensation all circuits of substation bus bar side and transformer, in use, often coordinate with ULTC, can further improve the quality of power supply of electric system.
In recent years, in day-to-day operation, often there is the phenomenon that capacitor damages, even the quick-fried group of group hinders in 35kV high-voltage parallel capacitor group, its failure rate is higher, directly threaten the safety of 500kV power equipment and O&M personnel's personal safety, cause line voltage obviously to fluctuate, meritorious, reactive loss increases, and capacitor reduces serviceable life, affects the normal stable operation of electrical network.
Utility model content
The 35kV high-voltage bridging capacitor group dielectric loss on-line monitoring device that technical problem to be solved in the utility model is warned before being to provide a kind of damaged condition of energy real-time online reflection capacitor and carrying out fault in advance.
For solving the problems of the technologies described above adopted technical scheme, be: a kind of 35kV high-voltage bridging capacitor group dielectric loss on-line monitoring device, comprises the 1st to the 9th current sensor, current conversion circuit, voltage conversion circuit, analog-to-digital conversion module, microprocessor, display, keyboard and power module; Described the 1st to the 9th current sensor is set in the sleeve bottom of the high-voltage parallel capacitor that needs Detection capacitance amount; Described the 1st output terminal to the 9th current sensor connects respectively the respective input of described current conversion circuit; The output terminal of voltage transformer (VT) in the input termination high-voltage parallel capacitor group discharge coil of described voltage conversion circuit; The output terminal of described current conversion circuit and voltage conversion circuit connects respectively the respective input of described analog-to-digital conversion module; The respective input of microprocessor described in the output termination of described analog-to-digital conversion module; Described display is connected with the corresponding port of described microprocessor respectively with keyboard; The power end of described current conversion circuit, voltage conversion circuit, analog-to-digital conversion module, microprocessor and display connects respectively the corresponding output end of described power module.
Described current conversion circuit comprises current transformer TA1, resistance R 1-R4 and capacitor C 1-C2;
The anodal IA1 of described current transformer TA1 input end connects respectively 1 pin of described the 1st to the 9th current sensor; The negative pole IA2 of described current transformer TA1 input end connects respectively 3 pin of described the 1st to the 9th current sensor;
Described resistance R 3 is connected on after connecting with resistance R 4 between the anodal OA1 and negative pole OA2 of described current transformer TA1 output terminal; The node R EFO of described resistance R 3 and resistance R 4 connects the 2.4V voltage output end of described power module;
Described resistance R 1 is connected on after connecting with capacitor C 1 between the anodal OA1 and ground of current transformer TA1 output terminal; The node V1P of described resistance R 1 and capacitor C 1 connects the current input terminal of described analog-to-digital conversion module;
Described resistance R 2 is connected on after connecting with capacitor C 2 between the negative pole OA2 and ground of current transformer TA1 output terminal; The node V1N ground connection of described resistance R 1 and capacitor C 1.
Described voltage conversion circuit comprises current transformer TA2, resistance R 5-R10 and capacitor C 5-C6;
The positive pole of described current transformer TA2 input end connects the positive pole of secondary windings of PT in high-voltage parallel capacitor group discharge coil through described resistance R 5; The negative pole of described current transformer TA2 input end connects the negative pole of secondary windings of PT in high-voltage parallel capacitor group discharge coil;
Described resistance R 6 is connected between the positive pole and negative pole of described current transformer TA2 output terminal;
Described resistance R 7 is connected on after connecting with resistance R 10 between the positive pole of described current transformer TA2 output terminal and the 2.4V voltage output end of described power module; Described resistance R 7 is divided two branch roads with the node V2P of resistance R 10, and wherein branch road connects the voltage input end of described analog-to-digital conversion module, and another branch road is through described capacitor C 5 ground connection;
Described resistance R 8 is connected on after connecting with resistance R 9 between the negative pole of described current transformer TA2 output terminal and the 2.4V voltage output end of described power module; Described resistance R 8 is divided two branch roads with the node V2N of resistance R 9, a grounding wherein, and another branch road is through described capacitor C 6 ground connection.
Described the 1st model to the 9th current sensor is LHK-2000; The model of described analog-to-digital conversion module is AD7656; The model of described microprocessor is AT91SAM9260; The model of described power module is ICE2A165.
The beneficial effects of the utility model are: while 1, using the utility model, without having a power failure, can understand the operation conditions of power capacitor bank, reduce the harmful effect that equipment has a power failure to client and power supply reliability, avoid numerous and diverse disconnecting link blocked operation.Although equipment is installed, increased operation cost of investment, compared with raising safety in operation with the human and material resources of saving, long-term effect is significant beyond doubt.
2, the utility model suits power capacitor bank operation and maintenance condition more, on-line monitoring power capacitor bank carries out under normal operation, the utility model can be found insulation defect in time, realize Real-Time Monitoring, overcome traditional preventive trial periodically length, concentrated deficiency of time, improve the validity of monitoring.
3, the utility model can reflect the running status of power capacitor bank in real time, to scenting a hidden danger in time, prevent accident of power supply, guaranteeing that safe power supply plays a good role, reliability, security, economic and social benefit are all very high, and the mass data that obtains of power capacitor bank on-line monitoring and can implement repair based on condition of component for power equipment to the discriminatory analysis of data reliable basis is provided, overcome the blindness that traditional preventive trial brings.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model.
Fig. 2 is current conversion circuit schematic diagram of the present utility model.
Fig. 3 is voltage conversion circuit schematic diagram of the present utility model.
Embodiment
From the embodiment shown in Fig. 1-3, it comprises the 1st to the 9th current sensor, current conversion circuit, voltage conversion circuit, analog-to-digital conversion module, microprocessor, display, keyboard and power module; Described the 1st to the 9th current sensor is set in the sleeve bottom of the high-voltage parallel capacitor that needs Detection capacitance amount; Described the 1st output terminal to the 9th current sensor connects respectively the respective input of described current conversion circuit; The output terminal of voltage transformer (VT) in the input termination high-voltage parallel capacitor group discharge coil of described voltage conversion circuit; The output terminal of described current conversion circuit and voltage conversion circuit connects respectively the respective input of described analog-to-digital conversion module; The respective input of microprocessor described in the output termination of described analog-to-digital conversion module; Described display is connected with the corresponding port of described microprocessor respectively with keyboard; The power end of described current conversion circuit, voltage conversion circuit, analog-to-digital conversion module, microprocessor and display connects respectively the corresponding output end of described power module.
Described current conversion circuit comprises current transformer TA1, resistance R 1-R4 and capacitor C 1-C2;
The anodal IA1 of described current transformer TA1 input end connects respectively 1 pin of described the 1st to the 9th current sensor; The negative pole IA2 of described current transformer TA1 input end connects respectively 3 pin of described the 1st to the 9th current sensor;
Described resistance R 3 is connected on after connecting with resistance R 4 between the anodal OA1 and negative pole OA2 of described current transformer TA1 output terminal; The node R EFO of described resistance R 3 and resistance R 4 connects the 2.4V voltage output end of described power module;
Described resistance R 1 is connected on after connecting with capacitor C 1 between the anodal OA1 and ground of current transformer TA1 output terminal; The node V1P of described resistance R 1 and capacitor C 1 connects the current input terminal of described analog-to-digital conversion module;
Described resistance R 2 is connected on after connecting with capacitor C 2 between the negative pole OA2 and ground of current transformer TA1 output terminal; The node V1N ground connection of described resistance R 1 and capacitor C 1.
Described voltage conversion circuit comprises current transformer TA2, resistance R 5-R10 and capacitor C 5-C6;
The positive pole of described current transformer TA2 input end connects the positive pole of secondary windings of PT in high-voltage parallel capacitor group discharge coil through described resistance R 5; The negative pole of described current transformer TA2 input end connects the negative pole of secondary windings of PT in high-voltage parallel capacitor group discharge coil;
Described resistance R 6 is connected between the positive pole and negative pole of described current transformer TA2 output terminal;
Described resistance R 7 is connected on after connecting with resistance R 10 between the positive pole of described current transformer TA2 output terminal and the 2.4V voltage output end of described power module; Described resistance R 7 is divided two branch roads with the node V2P of resistance R 10, and wherein branch road connects the voltage input end of described analog-to-digital conversion module, and another branch road is through described capacitor C 5 ground connection;
Described resistance R 8 is connected on after connecting with resistance R 9 between the negative pole of described current transformer TA2 output terminal and the 2.4V voltage output end of described power module; Described resistance R 8 is divided two branch roads with the node V2N of resistance R 9, a grounding wherein, and another branch road is through described capacitor C 6 ground connection.
Described the 1st model to the 9th current sensor is LHK-2000; The model of described analog-to-digital conversion module is AD7656; The model of described microprocessor is AT91SAM9260; The model of described power module is ICE2A165.
The course of work of the present utility model is as follows:
Utilize the 1st to the 9th current sensor that the current coupling on the capacitor of high-voltage parallel capacitor group is become to current signal, to the secondary side voltage of discharge coil, take parallel way to obtain voltage simultaneously, by the magnitude of current collecting and voltage respectively after current conversion circuit and voltage conversion circuit, after low-pass filtering and signal condition, to microprocessor, complete the collection of the capacitance current of high-voltage parallel capacitor group and phase voltage and storage.
Current conversion circuit is to utilize 5A/2.5mA current transformer, by the large current conversion on capacitor monomer binding post, it is little electric current, then this little electric current is converted into Voltage-output by resistance R 1, R3, V1p end output quantity is the electric parameters after current conversion circuit conversion.
In discharge coil, the voltage of voltage transformer (VT) is converted to electric current by the 110k Ω resistance R 5 of precision ± 1% by phase voltage, the 2mA/2mA current transformer that access nonlinearity is less than 0.1%, utilize afterwards resistance R 6 that secondary current is converted into Voltage-output, the differential voltage signal of secondary side is-0.1V ~+0.1V that wherein V2P end output quantity is the electric parameters after voltage conversion circuit conversion.
The utility model Real-Time Monitoring flows through the phase voltage of capacitor, the effective value of phase current and Wave data, and the data that collect are carried out to Fast Fourier Transform (FFT), draws harmonic information and total percent harmonic distortion of voltage; And when capacitor running status surpasses the use standard of capacitor, above data message can be saved voluntarily, for transfer later.If these information spinners that monitor have reflected the electric power quality of power supply, these information can be used for judging the reason that capacitor damages.The damaged condition of the utility model real-time online reflection capacitor, reminds maintainer to take measures to prevent the generation of capacitor faults.
The capacitor group device of normal operation, on each capacitor, the effective value of capacitance current is substantially equal.When certain capacitor breaks down, the electric current of each capacitor and three-phase operating voltage all can cause larger variation, and monitoring device is mainly by the real-time relatively current value of each capacitor of phase-splitting and the three-phase voltage value of capacitor, to carry out the ruuning situation of monitoring capacitor group.
Claims (4)
1. a 35kV high-voltage bridging capacitor group dielectric loss on-line monitoring device, is characterized in that: comprise the 1st to the 9th current sensor, current conversion circuit, voltage conversion circuit, analog-to-digital conversion module, microprocessor, display, keyboard and power module; Described the 1st to the 9th current sensor is set in the sleeve bottom of the high-voltage parallel capacitor that needs Detection capacitance amount; Described the 1st output terminal to the 9th current sensor connects respectively the respective input of described current conversion circuit; The output terminal of voltage transformer (VT) in the input termination high-voltage parallel capacitor group discharge coil of described voltage conversion circuit; The output terminal of described current conversion circuit and voltage conversion circuit connects respectively the respective input of described analog-to-digital conversion module; The respective input of microprocessor described in the output termination of described analog-to-digital conversion module; Described display is connected with the corresponding port of described microprocessor respectively with keyboard; The power end of described current conversion circuit, voltage conversion circuit, analog-to-digital conversion module, microprocessor and display connects respectively the corresponding output end of described power module.
2. a kind of 35kV high-voltage bridging capacitor group dielectric loss on-line monitoring device according to claim 1, is characterized in that: described current conversion circuit comprises current transformer TA1, resistance R 1-R4 and capacitor C 1-C2;
The anodal IA1 of described current transformer TA1 input end connects respectively 1 pin of described the 1st to the 9th current sensor; The negative pole IA2 of described current transformer TA1 input end connects respectively 3 pin of described the 1st to the 9th current sensor;
Described resistance R 3 is connected on after connecting with resistance R 4 between the anodal OA1 and negative pole OA2 of described current transformer TA1 output terminal; The node R EFO of described resistance R 3 and resistance R 4 connects the 2.4V voltage output end of described power module;
Described resistance R 1 is connected on after connecting with capacitor C 1 between the anodal OA1 and ground of current transformer TA1 output terminal; The node V1P of described resistance R 1 and capacitor C 1 connects the current input terminal of described analog-to-digital conversion module;
Described resistance R 2 is connected on after connecting with capacitor C 2 between the negative pole OA2 and ground of current transformer TA1 output terminal; The node V1N ground connection of described resistance R 1 and capacitor C 1.
3. a kind of 35kV high-voltage bridging capacitor group dielectric loss on-line monitoring device according to claim 2, is characterized in that: described voltage conversion circuit comprises current transformer TA2, resistance R 5-R10 and capacitor C 5-C6;
The positive pole of described current transformer TA2 input end connects the positive pole of secondary windings of PT in high-voltage parallel capacitor group discharge coil through described resistance R 5; The negative pole of described current transformer TA2 input end connects the negative pole of secondary windings of PT in high-voltage parallel capacitor group discharge coil;
Described resistance R 6 is connected between the positive pole and negative pole of described current transformer TA2 output terminal;
Described resistance R 7 is connected on after connecting with resistance R 10 between the positive pole of described current transformer TA2 output terminal and the 2.4V voltage output end of described power module; Described resistance R 7 is divided two branch roads with the node V2P of resistance R 10, and wherein branch road connects the voltage input end of described analog-to-digital conversion module, and another branch road is through described capacitor C 5 ground connection;
Described resistance R 8 is connected on after connecting with resistance R 9 between the negative pole of described current transformer TA2 output terminal and the 2.4V voltage output end of described power module; Described resistance R 8 is divided two branch roads with the node V2N of resistance R 9, a grounding wherein, and another branch road is through described capacitor C 6 ground connection.
4. a kind of 35kV high-voltage bridging capacitor group dielectric loss on-line monitoring device according to claim 3, is characterized in that: described the 1st model to the 9th current sensor is LHK-2000; The model of described analog-to-digital conversion module is AD7656; The model of described microprocessor is AT91SAM9260; The model of described power module is ICE2A165.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420357110.9U CN203941238U (en) | 2014-07-01 | 2014-07-01 | A kind of 35kV high-voltage bridging capacitor group dielectric loss on-line monitoring device |
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| CN201420357110.9U CN203941238U (en) | 2014-07-01 | 2014-07-01 | A kind of 35kV high-voltage bridging capacitor group dielectric loss on-line monitoring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261683A (en) * | 2018-08-17 | 2019-09-20 | 国网安徽省电力有限公司黄山供电公司 | A kind of Assembled high-voltage shunted capacitor set detecting device |
| CN111579878A (en) * | 2020-05-26 | 2020-08-25 | 广东电网有限责任公司 | Capacitive equipment online monitoring method based on multi-source data analysis |
-
2014
- 2014-07-01 CN CN201420357110.9U patent/CN203941238U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261683A (en) * | 2018-08-17 | 2019-09-20 | 国网安徽省电力有限公司黄山供电公司 | A kind of Assembled high-voltage shunted capacitor set detecting device |
| CN111579878A (en) * | 2020-05-26 | 2020-08-25 | 广东电网有限责任公司 | Capacitive equipment online monitoring method based on multi-source data analysis |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141112 |