CN202189142U - Complete set of error checking device for super/extra-high voltage CVT - Google Patents

Abstract

The utility model discloses a complete set of error checking device for super/extra-high voltage CVT (Capacitor Voltage Transformer). A voltage equalizing cover is mounted at the upper end of a primary wiring board, wherein the primary wiring board is connected to one end of an insulating sleeve; a three-way flange is connected to the other end of the insulating sleeve; a reference voltage transformer and a reactor upper-end flange are connected to the lower end of the three-way flange; the reference voltage transformer and the reactor upper-end flange are electrically connected via a high-voltage conductor; connecting plates are respectively connected with the reference voltage transformer and the reactor upper-end flange; a pair of main shafts are welded on the side face of box bodies of the reference voltage transformer and the reactor; a pair of main shafts are welded on the side face of the three-way flange; the voltage input end of a voltage regulator is connected with an AC power supply; the voltage output end of the voltage regulator is connected with the voltage input end of an exciting transformer; the voltage output end of the exciting transformer is connected with the low voltage end of the reactor; and an electrical control platform is used for displaying a voltage value measured by the reference voltage transformer and a current value of the reactor. The device provided by the utility model is applied to a super/extra-high voltage power station, and is used for performing an error checking test by applying power frequency voltage to the CVT.

Description

Ultra-high voltage and ultra-high voltage capacitive voltage transformer error calibration complete set of devices

(1) Technical field

The utility model discloses a complete set of device for error checking of super- and extra-high voltage capacitive voltage transformers, which relates to a kind of error detection equipment for capacitive voltage transformers, which is mainly used in super- and extra-high voltage power station sites to apply power frequency to capacitive voltage transformers. The utility model relates to voltage and error detection, which belongs to the field of capacitive voltage transformer test equipment. the

(2) Background technology

When the error calibration of the capacitor voltage transformer is performed on site, the test frequency must be carried out under the condition of 50Hz (or 60Hz). Since the capacitance of the capacitive voltage transformer is relatively large, generally 0.005 to 0.02uF, the requirements for the capacity of the test power supply are very high, usually hundreds of kVA or even hundreds of kVA, and it is often difficult to find such a transformer on site. Large-capacity power supply, at the same time, due to the complex transportation conditions on site, traditional step-up equipment such as power frequency test transformers are difficult to meet the requirements of on-site handling and testing due to their large size and weight. the

则 

此时回路达到谐振状态，达到此状态的方法有两种，一种是调节电感L，称为工频谐振；一种是调节频率f，称为变频谐振，针对电容式电压互感器误差测试试验要求，根据国家标准采用工频谐振做升压试验。  In order to reduce the capacity of the test power supply, the principle of series resonance is used to apply voltage, and a reactor is connected in series in the test circuit. hour,

but

At this time, the circuit reaches the resonance state. There are two ways to achieve this state. One is to adjust the inductance L, which is called power frequency resonance; the other is to adjust the frequency f, which is called frequency conversion resonance. Requirements, according to national standards, use power frequency resonance to do boost test.

Traditional EHV and UHV capacitive voltage transformer error detection equipment generally uses two or more oil-immersed or dry-type reactors for resonant boosting, and then cooperates with a separate standard voltage transformer for error detection. The equipment is bulky and difficult to transport. It is necessary to go to the high-altitude wiring to the power station site, which increases the risk of the test personnel working at high altitude. The electric field distribution of oil-immersed or dry-type reactors is uneven, and breakdown and burning are prone to occur during use. The overall height of the reactor is high, and it is inconvenient to pass bridges, culverts, etc. If the separate transportation method is used, each reactor needs to be installed together by cranes and other tools when arriving at the power station site, which increases the work intensity of the test personnel. less efficient. the

(3) Contents of the invention

In order to solve the above problems, this utility model proposes a complete set of device for error checking of ultra-high voltage and ultra-high voltage capacitive voltage transformers, which adopts the principle of series resonance, and makes the test loop reach a resonance state by adjusting the inductance value of the reactor, so as to realize the correction of capacitive voltage transformers. Requirements for voltage transformers to apply power frequency voltage. The standard voltage transformer and the capacitive voltage transformer are connected in parallel at the high-voltage end, and the measurement error is obtained through the comparison of the two voltages. The reactor and the standard voltage transformer are connected together through a tee flange, and the conductor is used inside to realize the electrical connection. The test personnel do not need to go to a high place for wiring, which improves the safety of the test personnel. The reactor and the standard voltage transformer share an insulating sleeve, which has a compact structure and reduces the volume of the complete set of equipment. The reactor and standard voltage transformer are integrally fixed on the hydraulic lifting device, which can be easily erected and laid down. Reactors and standard voltage transformers are insulated by sulfur hexafluoride gas, and shielding electrodes are installed inside the equipment to make the electric field distribution of the equipment more uniform and improve the insulation strength of the equipment. The reactor and the standard voltage transformer are fixed in an integrated structure, the overall width is less than 2.3 meters, and the transportation is convenient. After optimized design, the complete set of equipment can withstand the mechanical impact of more than 10 times the acceleration of gravity during transportation. According to theoretical calculations, the quality factor of the reactor is Q≥10, and the accuracy level of the standard voltage transformer reaches 0.005-0.1. the

The technical solution adopted by the utility model to solve the technical problems is: a complete set of error checking device for ultra-high and ultra-high voltage capacitive voltage transformers, which mainly consists of a pressure equalizing cover (1), a primary wiring board (2), and a high-voltage conductor ( 3), insulating bushing (4), tee flange (5), standard voltage transformer (6), connection plate (7), reactor (8), excitation transformer (9), voltage regulator (10) , electric console (11), hydraulic platform (12), hydraulic station (13), hydraulic cylinder (14), support (15), hydraulic control cabinet (16), etc., and is characterized in that: pressure equalizing cover (1 ) is installed on the upper end of the primary wiring board (2), the primary wiring board (2) is connected to one end of the insulating sleeve (4), the other end of the insulating sleeve (4) is connected to the tee flange (5), and the tee flange (5) The lower end is respectively connected to the standard voltage transformer (6) and the upper end flange of the reactor (8), and the upper end flange of the standard voltage transformer (6) and the reactor (8) is electrically connected through the high voltage conductor (3). The connection plate (7) is respectively connected to the standard voltage transformer (6) and the lower end flange of the reactor (8). A pair of main shafts are welded on the sides of the standard voltage transformer (6) and the reactor (8). A pair of main shafts are welded on the side of the blue (5), the voltage input terminal of the voltage regulator (10) is connected to the AC power supply, the voltage output terminal of the voltage regulator (10) is connected to the voltage input terminal of the excitation transformer (9), and the excitation transformer (9) ) is connected to the low-voltage end of the reactor (8), the electrical console (11) controls the output voltage of the voltage regulator (10), and the electrical console (11) displays the voltage measured by the standard voltage transformer (6). The voltage value and the current value of the reactor (8). the

It is characterized in that: the reactor (8) and the standard voltage transformer (6) are filled with sulfur hexafluoride gas, the two are connected together by a tee flange (5), and the electrical connection is realized by a high-voltage conductor (3) inside . the

It is characterized in that: the reactor (8) and the standard voltage transformer (6) share one insulating bushing (4). the

It is characterized in that: the reactor (8) and the standard voltage transformer (4) are erected and laid down through a hydraulic lifting device. the

The beneficial effect of the utility model is that both the reactor (8) and the standard voltage transformer (6) adopt sulfur hexafluoride gas insulation technology, and shielding electrodes are placed inside, which improves the insulation strength of the equipment. The reactor (8) and the standard voltage transformer (6) are connected together through the tee flange (5), and the high-voltage conductor (3) is used inside to realize the electrical connection, so that the test personnel do not need to go to a high place for wiring, which improves the test personnel's safety. safety. The reactor (8) and the standard voltage transformer (6) share an insulating bushing (4). The two are integrally fixed on the hydraulic lifting device, which can be easily erected and laid down. The width of the reactor is less than 2.3 meters. , easy to transport. the

(4) Description of drawings

Fig. 1 is a sectional view of the utility model. the

Fig. 2 is an equivalent electrical schematic diagram of the utility model. the

Fig. 3 is the electrical wiring diagram of the utility model. the

Figure 4 is a schematic diagram of a reactor and a standard voltage transformer laid down. the

Figure 5 is a schematic diagram of reactors and standard voltage transformers erected. the

In the figure 1. Pressure equalizing cover, 2. Primary terminal board, 3. High voltage conductor, 4. Insulating bushing, 5. Tee flange, 6. Standard voltage transformer, 7. Connecting plate, 8. Reactor, 9 .Excitation transformer, 10. Voltage regulator, 11. Electrical console, 12. Hydraulic platform, 13. Hydraulic station, 14. Hydraulic cylinder, 15. Bracket, 16. Hydraulic control cabinet, 17. Capacitive voltage transformer. the

(5) Specific implementation methods

Below in conjunction with accompanying drawing, the utility model is described in detail. the

In Figure 1, the pressure equalizing cover (1) is installed on the upper end of the primary terminal board (2), the primary terminal board (2) is connected to one end of the insulating sleeve (4), and the other end of the insulating sleeve (4) is connected to the three-way method The upper flange (5) and the lower end of the tee flange (5) are respectively connected to the upper end flanges of the standard voltage transformer (6) and the reactor (8), and the upper end flanges of the standard voltage transformer (6) and the reactor (8) The electrical connection is realized through the high-voltage conductor (3), the connecting plate (7) is respectively connected to the lower end flanges of the standard voltage transformer (6) and the reactor (8), and the box of the standard voltage transformer (6) and the reactor (8) A pair of main shafts are welded on the side of the body, and a pair of main shafts are welded on the side of the tee flange (5). The voltage input end of the excitation transformer (9) is connected to the low-voltage end of the reactor (8), the electric console (11) controls the output voltage of the voltage regulator (10), and the electric console (11) Display the voltage value measured by the standard voltage transformer (6) and the current value of the reactor (8). the

-等效电感两端电压， 

-等效电容两端电压， 

-回路电流。本发明采用串联谐振原理，在试验回路中串入电抗器，当 

时， 则 

此时回路达到谐振状态，在谐振状态时，则有 

此时 

被试品C上获得的容量 

电抗器L上获得的容量S_L＝I²·ωL，激励变的输出容量为S＝U·I＝U_R·I＝I²R，因此，品质因数 

因为ωL＞＞R，故Q＞＞1，由此可见，适当地设计回路的品质因数值，则谐振系统可在被试品C上获得Q倍输入电源的容量，可大大降低试验电源的容量。  In Figure 2, the annotation text description: JB-excitation transformer, R-equivalent resistance, L-equivalent inductance, C-equivalent capacitance, - the voltage across the excitation transformer, - the voltage across the equivalent resistance,

- the voltage across the equivalent inductance,

- the voltage across the equivalent capacitor,

- Loop current. The present invention adopts the principle of series resonance, and a reactor is connected in series in the test loop, when

hour, but

At this time, the circuit reaches the resonance state, and in the resonance state, there is

at this time

The capacity obtained on the test object C

The capacity S L obtained on the reactor _L =I ² ·ωL, the output capacity of the excitation transformer is S=U·I=U _R ·I=I ² R, therefore, the quality factor

Because ωL>>R, so Q>>1, it can be seen that if the value of the quality factor of the circuit is properly designed, the resonant system can obtain Q times the capacity of the input power on the tested product C, which can greatly reduce the capacity of the test power .

In Fig. 3, the voltage input terminal of the voltage regulator (10) is connected to the AC power supply, the voltage output terminal of the voltage regulator (10) is connected with the voltage input terminal of the excitation transformer (9), and the voltage output terminal of the excitation transformer (9) Connect with the low-voltage end of the reactor (8), connect the high-voltage end of the reactor (8) with the high-voltage end of the standard voltage transformer (6) and the capacitor voltage transformer (17) respectively, excite the transformer (9), standard voltage The low-voltage terminals of the transformer (6) and the capacitive voltage transformer (17) are connected in parallel to ground. the

In Fig. 4, the main shaft on the side of the reactor (8) and the standard voltage transformer (6) box is fixed to the bracket (15), the bracket (15) is welded to the hydraulic platform (12), and the tee flange (5 ) and the main shaft on the side are set to the upper end of the hydraulic cylinder (14), the lower end of the hydraulic cylinder (14) is fixed on the hydraulic platform (12), the hydraulic station (13) and the hydraulic control cabinet (16) are fixed on the hydraulic platform (12) Above, the test personnel control the different working positions of the hydraulic solenoid valve through the operation buttons of the hydraulic control cabinet, and can realize the erection and downturning operations of the reactor (8) and the standard voltage transformer (6). the

In Fig. 5, the reactor (8) and the standard voltage transformer (6) are erected schematically. In the state shown in the figure, the power frequency voltage applied to the capacitor voltage transformer and the error detection test are completed. the

The material of the reactor (8) shell, the standard voltage transformer (6) and the tee flange (5) of the utility model is Q235A steel plate or 5A02 aluminum plate, and the material of the equalizing cover (1) is 5A02 aluminum plate, which is formed by spinning . the

The utility model has been tested through experiments, and the overall quality factor of the complete set of devices is Q≥10, and the precision level of the standard voltage transformer reaches 0.005-0.1, which can meet the requirements of applying power frequency voltage and error detection to the capacitive voltage transformer on-site in super and ultra-high voltage power stations. Test requirements. the

Claims (4)

1. ultra, extra-high voltage capacitance type potential transformer error checking complete equipment; Mainly form by grading shield, primary connection plate, high-pressure conductor, insulating sleeve, threeway flange, standard potential transformer, web joint, reactor, driver transformer, pressure regulator, electrical control panel, hydraulic platform, Hydraulic Station, hydraulic cylinder, support, hydrostatic control cabinet etc.; It is characterized in that: grading shield is installed in primary connection plate upper end; The primary connection plate is connected insulating sleeve one end; The insulating sleeve other end is connected on the threeway flange, and threeway flange lower end is connected with standard potential transformer and reactor upper flanges respectively, and standard potential transformer and reactor upper flanges realize being electrically connected through high-pressure conductor; Web joint respectively with standard potential transformer and reactor under end flanges be connected; The casing side of standard potential transformer and reactor is welded with a pair of main shaft, and threeway flange side is welded with a pair of main shaft, and the voltage input end of pressure regulator connects AC power; The voltage output end of pressure regulator is connected with the voltage input end of driver transformer; The voltage output end of driver transformer is connected with the low pressure end of reactor, the output end voltage of electrical control panel control pressure regulator, the magnitude of voltage of electrical control panel display standard voltage measuring transformer and the current value of reactor.

2. a kind of ultra, extra-high voltage capacitance type potential transformer error checking complete equipment according to claim 1; It is characterized in that: sulfur hexafluoride gas is filled in reactor and standard potential transformer inside; Both connect together through the threeway flange, realize being electrically connected through high-pressure conductor in inside.

3. a kind of ultra, extra-high voltage capacitance type potential transformer error checking complete equipment according to claim 1 is characterized in that: the shared insulating sleeve of reactor and standard potential transformer.

4. a kind of ultra, extra-high voltage capacitance type potential transformer error checking complete equipment according to claim 1, it is characterized in that: reactor and standard potential transformer realize holding up and falling operation through hydraulic lift.

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