CN2201754Y - Secondary load linear voltage reducing compensator for voltage mutual inductor - Google Patents
Secondary load linear voltage reducing compensator for voltage mutual inductor Download PDFInfo
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- CN2201754Y CN2201754Y CN 94221004 CN94221004U CN2201754Y CN 2201754 Y CN2201754 Y CN 2201754Y CN 94221004 CN94221004 CN 94221004 CN 94221004 U CN94221004 U CN 94221004U CN 2201754 Y CN2201754 Y CN 2201754Y
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- voltage
- mutual inductor
- compensator
- secondary load
- compensation
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Abstract
The utility model relates to a secondary load linear voltage reducing compensator for voltage mutual inductor for electrical energy metering in an electric power system. Two multitap compensating transformers provide each stage compensating voltage required by the voltage mutual inductor difference compensation and provide each stage voltage required by the angular difference compensation capacitor, the compensated secondary voltage of the voltage mutual inductor completely meets the accuracy requirement of the technical parameter by the first grade (the first grade is the highest accuracy grade) electrical energy meter in the national prescription, and an audible and visual alarm happens when a safety fuse fuses.
Description
The utility model relates to a kind of electric power system electric energy metrical and falls compensator with voltage transformer secondary load line pressure.
In the electric power system, the power circuit of 6KV and above electric pressure must insert electric energy meter with the 100V voltage that high-voltage variable is changed to standard by voltage transformer, just can carry out electric energy metrical.Voltage transformer secondary also is connected to circuit elements such as voltmeter, wattmeter and relaying protection except that being connected to electric energy meter, load is heavier; Simultaneously, be installed in the open air than the voltage transformer of high input voltage, meter meter etc. is installed in indoor, and lead reaches tens meters even hundreds of rice therebetween.Heavier load and long lead must cause voltage transformer secondary to export the difference of voltage on voltage and the indoor instrument terminal, cause metering and measure error.Especially the error in dipping of electric energy meter, its direct result are that the metering electric degree is less than the actual power electric degree, cause heavy economic losses to power department.Although this problem is of long duration, until in recent years, along with improving constantly of power department managerial skills, the carrying out at all levels of technical and economic responsibility after the system reform just built consensus in the mind of people's door, addresses this problem thereupon and puts on agenda.At present indivedual departments take some measures attempts to address this problem, and does not obtain desired result as yet, and the cost costliness, embarrasses customer acceptance.
The purpose of this utility model be exactly release a kind of reasonable in technology for addressing this problem, compensation precision satisfies measuring requirement and cheap voltage transformer secondary load line voltage drop compensator.
The voltage magnitude that the utility model causes voltage transformer (following voltage transformer is called for short PT) secondary load line reduces (title ratio) and phase angle and is offset (title angular difference) and carries out fine compensation.Wherein the maximum compensation rate of ratio can reach 4.95% of PT secondary rated voltage 100V, i.e. 4.95V; The compensation fineness is 0.05% of 100V, i.e. 0.05V.Angular difference compensation fineness can reach 2 fens electrical degrees.The comprehensive compensation effect satisfies in country's " electric power meter inspection procedure " fully about an important class measuring instrument, and its PT secondary load line pressure must not fall and surpassed 0.25% requirement.Below in conjunction with accompanying drawing, function of the present utility model and principle are further described.
The basic principle of angular difference compensation is, must belong to inductive load with capacitor to the PT secondary and compensate, and makes the power-factor of load of PT secondary equal 1 or approach 1.At this moment, the load current of PT secondary has only voltage magnitude to change on lead, no longer produces the phase angle skew, has promptly realized the angular difference compensation.5 is A, B phase angle difference compensation condenser among Fig. 1, the 6th, and fuse, the 4th, single pole multiple throw.When the cutting blade of switch 4 was connected to 1.0 taps of transformer 1, capacitor 5 both end voltage were zero.When cutting blade slips over 1.0 to 1.10 each voltage taps of transformer 1 in the counterclockwise direction since 1.0 taps, capacitor 5 both end voltage raise gradually, it increases progressively by shelves with 10% amplitude the compensation effect of angular difference, reaches 100% compensation rate during to 1.10 taps.According to the operation needs, allow the cutting blade of switch 4 be connected to the suitable tap position of transformer 1.
Sound light alarming circuit when the square frame 7 among Fig. 1 is fuse 6 fusing.Capacitor 5 has more greatly in energising just moment and shoves, and with fuse 6 it is protected, and in a single day fuse opens circuit, and then the angular difference compensate function will lose, must in time notify the operations staff to handle, and recover accurate the metering rapidly to guarantee electric energy meter.The working power of warning circuit 7 is provided mutually by A, the B in the three-phase input; After fuse 6 fusing, send triggering signal by capacitor 5 to warning circuit 7 automatically immediately, carry out sound and light alarm.Warning circuit can be made up of by typical circuit elements such as warning integrated circuit, loudspeaker, light-emitting diodes, does not describe in detail herein.
More than narration is ratio, the angular difference compensation principle of A, B phase, and the compensation principle of C, B phase is identical.Realize that the element that C, B compensate mutually has: the compensator transformer 2 among Fig. 1; Capacitor 11; Fuse 10; Single pole multiple throw 12,13 and 16; Sound light alarming circuit 9.
Compensator falls in A, B phase compensating circuit and C, B complete PT secondary load line pressure of compensating circuit formation mutually.
The utlity model has following good effect and advantage:
1. bucking voltage instrument transformer secondary load line drop is retrieved a large amount of electric energy metrical losses and economic loss for power supply department, and power department is improved management level, accurately examines economic and technical norms to be significant.
2. voltage drop compensates to the voltage transformer secondary load line with this compensator, with other method come simply, accurate and with low cost.
3. this compensator makes the secondary load power factor of voltage transformer equal 1 or approach 1, and therefore, the secondary load electric current of voltage transformer is reduced to minimum value, and this helps reducing the load error of voltage transformer itself, and improves the security reliability of operation.
Realize the utility model, compensator can be made into suspension type metal shell instrument.Positive front is provided with panel, and accompanying drawing 2 is panel component layout plans, and wherein 17 is names of product; 4,12,3,14,13,16 is six single pole multiple throws; 6, the 10th, fuse (seat); 18, the 19th, the indication luminous tube of reporting to the police, indicating fuse 6 or 10 fusing respectively when igniting; The 20th, alarming horn pronunciation window; 18,19,20 corresponding to the sound light alarming circuit in the accompanying drawing 17 and 9; 8,15 is respectively three-phase input and output terminals; The 21st, the organization of producing this compensator.Except that panel component, all the other elements all are fixed on the back base plate of metal shell or appropriate location in the casing.
Claims (1)
- A kind of electric power system electric energy metrical falls compensator with voltage transformer secondary load line pressure, it is characterized in that: single pole multiple throw (3,14,13,16) selects to connect the suitable tap of compensator transformer (1,2), realizes the compensation of voltage transformer ratio; Single pole multiple throw (4,12) inserts different numerical value voltages for capacitor (5,11), realizes the compensation of voltage transformer angular difference; Fuse (6,10) two ends are connected to sound light alarming circuit (7,9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94221004 CN2201754Y (en) | 1994-09-05 | 1994-09-05 | Secondary load linear voltage reducing compensator for voltage mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94221004 CN2201754Y (en) | 1994-09-05 | 1994-09-05 | Secondary load linear voltage reducing compensator for voltage mutual inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2201754Y true CN2201754Y (en) | 1995-06-21 |
Family
ID=33835436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94221004 Expired - Fee Related CN2201754Y (en) | 1994-09-05 | 1994-09-05 | Secondary load linear voltage reducing compensator for voltage mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2201754Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108616131A (en) * | 2018-03-19 | 2018-10-02 | 中国电力科学研究院有限公司 | A kind of device and method for carrying out power back-off for electrical integrated mutual inductor |
| CN112003289A (en) * | 2020-08-26 | 2020-11-27 | 长沙理工大学 | Power distribution network undervoltage automatic compensation method and device based on bilateral multi-tap transformer |
-
1994
- 1994-09-05 CN CN 94221004 patent/CN2201754Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108616131A (en) * | 2018-03-19 | 2018-10-02 | 中国电力科学研究院有限公司 | A kind of device and method for carrying out power back-off for electrical integrated mutual inductor |
| CN112003289A (en) * | 2020-08-26 | 2020-11-27 | 长沙理工大学 | Power distribution network undervoltage automatic compensation method and device based on bilateral multi-tap transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |