CN216646638U

CN216646638U - Three-phase shunt reactor loss test system

Info

Publication number: CN216646638U
Application number: CN202122308040.0U
Authority: CN
Inventors: 韩凯; 谢明德; 杨在葆; 李学成; 马华辉; 刘中凯; 席永鹏
Original assignee: Shandong Power Equipment Co Ltd
Current assignee: Shandong Power Equipment Co Ltd
Priority date: 2021-09-23
Filing date: 2021-09-23
Publication date: 2022-05-31
Anticipated expiration: 2031-09-23

Abstract

The utility model relates to a loss test system of a three-phase parallel reactor.A synchronous generator set provides a power supply for test; the intermediate transformer is used for boosting the system; the compensation reactor is connected to the outlet side of the synchronous generator set, and the inductive reactive power of the compensation system is compensated to prevent the synchronous generator set from carrying capacitive load; the compensation capacitor is used for compensating the reactive power of the system; the three-phase intermediate transformer is of a three-phase double-winding structure, and the head and the tail of a high-voltage three-phase winding are respectively led out; a current comparator is connected between the three-phase intermediate transformer and the three-phase shunt reactor of the tested object, and the current comparator acquires a current signal; and the standard capacitor is connected to the end part of the sleeve of the three-phase shunt reactor of the tested object and is used for testing voltage. And a dielectric loss bridge is connected between the current comparator and the standard capacitor and measures a dielectric loss factor. The loss test system has the advantages of simple system structure, quick and convenient connection and suitability for the loss test requirements of the existing three-phase parallel reactor.

Description

Three-phase shunt reactor loss test system

Technical Field

The utility model belongs to the technical field of transformer testing, and particularly relates to a loss testing system for a three-phase parallel reactor.

Background

With the development of power grids, the three-phase shunt reactor is widely applied to a starting-end booster station, an intermediate connection station and a high-voltage direct-current transmission converter station of a high-voltage long-distance transmission line, has the functions of compensating reactive power of the power grids, reducing power grid loss, improving transmission capacity, restraining resonance overvoltage of the power grids, preventing self-excitation of a generator, eliminating no-load long-line capacitance effect and high-voltage cable capacitance effect, restraining power frequency overvoltage and the like, can save energy, and improves the operation stability and reliability of a power system.

At present, three-phase shunt reactors mostly adopt three high-voltage bushings at the first section, and one neutral point bushing at the tail end. Compared with the original structure with three neutral point bushing leading-out structures, the structure saves two bushings, reduces the volume of a product and saves the overall arrangement space. However, for such three-phase shunt reactor, the current of each coil needs to be measured in the test process, and sometimes it is impossible to distinguish which phase current is tested, which brings great difficulty to the loss measurement of the three-phase shunt reactor.

Disclosure of Invention

In order to solve the technical problem, the utility model designs a loss test system of a three-phase shunt reactor, which utilizes a three-phase intermediate transformer, wherein three neutral point bushings are respectively led out from three-phase high voltage, so that the problem that each phase of current test cannot be distinguished in the loss test of the three-phase shunt reactor is solved. The technical scheme adopted by the utility model is as follows:

a loss test system for a three-phase shunt reactor comprises a synchronous generator set, a compensation reactor, an intermediate transformer, a compensation capacitor bank, a three-phase intermediate transformer and a three-phase shunt reactor of a tested article which are connected in sequence;

the synchronous generator set provides a power supply for test; the intermediate transformer is used for boosting the system; the compensation reactor is connected to the outlet side of the synchronous generator set, and the compensation system is inductive and reactive, so that the synchronous generator set is prevented from carrying capacitive load; the compensation capacitor is used for compensating the reactive power of the system; the three-phase intermediate transformer is of a three-phase double-winding structure, and the head and the tail of a high-voltage three-phase winding are respectively led out; a current comparator is connected between the three-phase intermediate transformer and the three-phase shunt reactor of the tested object, and the current comparator acquires a current signal; and the standard capacitor is connected to the end part of the sleeve of the three-phase shunt reactor of the tested object and is used for testing voltage. And a dielectric loss bridge is connected between the current comparator and the standard capacitor and measures a dielectric loss factor.

The utility model has the beneficial effects that:

the utility model introduces a three-phase intermediate transformer with a three-phase double-winding structure, and three-phase high-voltage neutral points of the three-phase intermediate transformer are respectively connected to neutral points of a three-phase shunt reactor of a tested article through cables, thereby solving the technical problem that the tail end of the three-phase shunt reactor is led out by adopting a neutral point sleeve, and the phase current can not be distinguished in the test process.

The loss test system of the three-phase parallel reactor has the advantages of simple system structure, quick and convenient connection and suitability for the loss test requirements of the existing three-phase parallel reactor.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are specific embodiments of the utility model, and that other drawings within the scope of the present application can be obtained by those skilled in the art without inventive effort.

FIG. 1 is a schematic diagram of a connection configuration of a loss testing system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a connection structure of a current comparator according to an embodiment of the present invention;

the system comprises a synchronous generator set 1, a middle transformer 2, a compensation reactor 3, a compensation capacitor bank 4, a three-phase middle transformer 5, a current comparator 6, a standard capacitor 7, a three-phase shunt reactor 8 and a dielectric loss bridge 9.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Fig. 1 is a schematic diagram of a connection structure of a loss test system according to an embodiment of the present invention. A loss test system for a three-phase shunt reactor comprises a synchronous generator set 1, a compensation reactor 3, an intermediate transformer 2, a compensation capacitor bank 4, a three-phase intermediate transformer 5 and a three-phase shunt reactor 8 of a tested article which are connected in sequence. The synchronous generator set 1 provides a power supply for test; the intermediate transformer 2 adopts a 110kV intermediate transformer and is used for boosting the system; the compensation reactor 3 is connected to the outlet side of the synchronous generator set 1, and the inductive reactive power of a compensation system is compensated to prevent the synchronous generator set 1 from carrying capacitive load; the compensation capacitor 4 is used for compensating the reactive power of the system; the three-phase intermediate transformer 5 is a three-phase intermediate transformer for a three-phase shunt reactor and has a three-phase double-winding structure, and the head and the tail of a high-voltage three-phase winding are respectively led out; a current comparator 6 is connected between the three-phase intermediate transformer 5 and the three-phase shunt reactor 8 of the tested object, the current comparator 6 collects current signals, and the current comparator 6 is equivalent to a current transformer for loss testing; and the standard capacitor 7 is connected to the end part of a sleeve of the tested three-phase shunt reactor 8, and a voltage signal is obtained for testing voltage. A dielectric loss bridge 9 is connected between the current comparator 6 and the standard capacitor 7, and the dielectric loss bridge 9 measures a dielectric loss factor.

Further technical scheme, three-phase shunt reactor loss test system's connection structure is: the synchronous generator set 1 is connected to the low-voltage side of a 110kV intermediate transformer 2 through an output cable, the low-voltage side of the synchronous generator set 1 is connected with a compensation reactor 3 in parallel through a cable, the high-voltage output of the 110kV intermediate transformer 2 is connected with the low-voltage side of a three-phase intermediate transformer 5 through a bus and a disconnecting link, and the compensation capacitor bank 4 is connected in parallel through the bus; the three-phase high voltage of the three-phase intermediate transformer 5 passes through 150mm respectively²Is connected to the three-phase high voltage of the three-phase shunt reactor 8 of the tested object, and simultaneously, the three-phase high voltage neutral points of the three-phase intermediate transformer 5 respectively pass through 150mm²Is connected to the neutral point of the three-phase shunt reactor 8 of the tested object. When the loss of each phase of the three-phase shunt reactor 8 is tested, a standard capacitor 7 is connected to the phase acquisition voltage signal U; and simultaneously, a current signal I is collected by using a current comparator 6, the collected secondary voltage and current signals are collected to a dielectric loss bridge 9 through a secondary cable, and the dielectric loss bridge 9tan delta of the tested three-phase shunt reactor 8 is measured, so that the loss P of the three-phase shunt reactor can be calculated, wherein the loss P is U. The current comparator 6 adopts a havele current comparator CC, the standard capacitor 7 adopts a havele standard capacitor 1200kV/20.084pF K of 3000, and the dielectric loss Bridge 9 adopts a havele 2840 type dielectric loss Bridge distance Bridge, as shown in fig. 2, which is a schematic diagram of a connection structure of the current comparator of the embodiment of the present invention.

When the loss test is carried out on the three-phase shunt reactor, the loss of each phase needs to be tested independently, and finally the three-phase synthetic loss is calculated. The specific test method is as follows:

when loss test is carried out on the A phase of the three-phase shunt reactor 8, the standard capacitor 7 is used for measuring A phase voltage, the current comparator 6 is used for measuring test current of an A phase loop, data are collected to the dielectric loss bridge 9, the IEEE1394 live wire data bus technology is used in the dielectric loss bridge 9, data of voltage and current and time information (such as phase shift) can be measured quickly and accurately, and the dielectric loss factor tan delta of the voltage and the current can be calculated with the phase shift.

When the loss of the phase B is tested, a primary loop is unchanged, the standard capacitor 7 is connected to a phase B terminal of the three-phase shunt reactor 8, and the current comparator 6 tests the loop current of the phase B; when the C-phase loss is tested, the primary loop is unchanged, the standard capacitor 7 is connected to the C-phase terminal of the three-phase shunt reactor 8, and the current comparator 6 tests the C-phase loop current. And (4) measuring the loss of three phases for three times, wherein the voltage is increased to the rated voltage Ur, and respectively recording the data of current, loss, power factor and the like of each phase.

And (3) loss calculation process: by testing each phase, the voltage Ux, the current Ix and the dielectric loss factor tan δ of each phase can be obtained, so that the measured loss PsA of the a phase is obtained as Ux Ix tan δ, and similarly, by replacing the connection, PsB is obtained as Ux Ix tan δ and PsC is obtained as Ux Ix tan δ, so that the total loss at the rated voltage of the three-phase shunt reactor 8 is the vector sum of the three-phase test results, and Ps is obtained as PsA + PsB + PsC.

Finally, it is to be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, and the scope of the present invention is not limited thereto. Those skilled in the art will understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.

Claims

1. A loss test system for a three-phase shunt reactor is characterized by comprising a synchronous generator set (1), a compensation reactor (3), an intermediate transformer (2), a compensation capacitor bank (4), a three-phase intermediate transformer (5) and a three-phase shunt reactor (8) of a tested article, which are connected in sequence;

the synchronous generator set (1) provides a power supply for test testing, the intermediate transformer (2) is used for boosting the system, the compensation reactor (3) is connected to the outlet side of the synchronous generator set (1), and the compensation capacitor bank (4) is used for compensating the reactive power of the system; the three-phase intermediate transformer (5) is of a three-phase double-winding structure, and the head and the tail of a high-voltage three-phase winding are respectively led out; a current comparator (6) is connected between the three-phase intermediate transformer (5) and the three-phase shunt reactor (8) of the tested object, a standard capacitor (7) is connected to the end part of a sleeve of the three-phase shunt reactor (8) of the tested object, and a dielectric loss bridge (9) is connected between the current comparator (6) and the standard capacitor (7).

2. The loss test system of the three-phase shunt reactor according to claim 1, wherein the connection structure of the loss test system is as follows: the synchronous generator set (1) is connected to the low-voltage side of the intermediate transformer (2) through an output cable, the low-voltage side of the synchronous generator set (1) is connected with a compensating reactor (3) in parallel through a cable, the high-voltage output of the intermediate transformer (2) is connected with the low-voltage side of the three-phase intermediate transformer (5) through a bus and a disconnecting link, and the compensating capacitor bank (4) is connected in parallel through the bus; the three-phase high voltage of the three-phase intermediate transformer (5) passes through 150mm respectively²The cable is connected to the three-phase high voltage of the three-phase shunt reactor (8) of the tested object, and simultaneously, the three-phase high voltage neutral points of the three-phase intermediate transformer (5) respectively pass through 150mm²Is connected to the neutral point of the three-phase shunt reactor (8) of the tested object.

3. A three-phase shunt reactor loss test system as claimed in claim 2, characterized in that the intermediate transformer (2) is a 110kV intermediate transformer, and the three-phase intermediate transformer (5) is a three-phase intermediate transformer for a three-phase shunt reactor.

4. The system for testing the loss of the three-phase shunt reactor according to claim 2, wherein the current comparator (6) adopts a Hafley current comparator CC, the standard capacitor (7) adopts a Hafley standard capacitor, and the dielectric loss bridge (9) adopts a Hafley 2840 type dielectric loss bridge.