CN207782415U - Reactive power compensator and mutual inductor detection device - Google Patents

Abstract

The utility model provides a kind of reactive power compensator and mutual inductor detection device, is related to electrical equipment technical field.The electric energy of external power supply can be adjusted by pressure regulator, compensating unit is compensated using the reactance that tunable capacitor group can load pressure regulator, is improved power factor when voltage regulator operation, can be improved the voltage regulation result of pressure regulator.Larger electric current can also be obtained using the smaller pressure regulator of apparent energy, the electric current that current lifting device exports is allow to meet the needs of ct calibrating, reduces the consumption to electric energy, it is energy saving.

Description

Reactive power compensation device and transformer testing equipment

technical field

The utility model relates to the technical field of electric power equipment, in particular to a reactive power compensation device and transformer detection equipment.

Background technique

At present, when testing the transformer, it is necessary to provide a larger detection current for the transformer, but the power supply capacity in the existing laboratory is limited, and when a larger current is required, it cannot meet the current requirements for the verification.

Utility model content

In view of this, the utility model provides a reactive power compensation device and transformer detection equipment, which can solve the above problems.

The technical scheme provided by the utility model is as follows:

A reactive power compensation device, including a voltage regulator, a monitoring unit, a compensation unit and a current booster, wherein:

The voltage regulator is respectively connected to the external power supply and the monitoring unit, and is used to adjust the electric energy input by the external power supply, and output the adjusted electric energy to the current booster;

The monitoring unit is used to detect the current, voltage and power factor of the output electric energy of the voltage regulator;

The compensation unit is connected to the output terminal of the monitoring unit, and the compensation unit includes an adjustable capacitor group with adjustable capacitance value, and the compensation unit is used to compensate the reactance of the voltage regulator load through the adjustable capacitor group;

The current booster is connected with the voltage regulator, and is used for converting the current output by the voltage regulator to a preset current and outputting it to an external device.

Further, the voltage regulator includes a voltage regulating winding, the input end of the voltage regulating winding is connected to the external power supply, and the output end of the voltage regulator includes a static contact and a moving contact;

The monitoring unit includes a voltage detection module, which is respectively connected to the static contact and the movable contact, and is used to detect the voltage of the output electric energy of the voltage regulator.

Further, the monitoring unit also includes a current transformer, a current detection module and a power factor detection module, wherein:

One end of the primary winding of the current transformer is connected to the moving contact, and the other end of the primary winding of the current transformer is connected to the input end of the current booster;

One end of the current detection module is connected to one end of the secondary winding of the current transformer, and the other end of the current detection module is connected to a current input end of the power factor detection module. The current detection module is used to detect The current of the output electric energy of the voltage regulator;

The other current input terminal of the power factor detection module is connected to the other end of the secondary winding of the current transformer, the voltage input terminal of the power factor detection module is connected to the input terminal of the current booster, and the power The factor detection module is used to detect the power factor of the output electric energy of the voltage regulator.

Further, the adjustable capacitor group includes at least one adjustable capacitor, at least one fixed capacitor, and at least one switch, wherein:

The adjustable capacitor and the fixed capacitor are respectively connected in series with the corresponding switches to form a parallel circuit, one end of the parallel circuit is used as the input end of the compensation unit, and the other end of the parallel circuit is used as the output end of the compensation unit, The input end and the output end of the compensation unit are respectively connected to the input end of the current booster.

Further, the input terminal of the current booster includes a first terminal and a second terminal, the voltage input terminal of the power factor detection module includes a first voltage input terminal and a second voltage input terminal, and the first terminal terminals are respectively connected to the static contact, the first voltage input terminal and the output terminal of the compensation unit, and the second terminal is respectively connected to the other end of the primary winding of the current transformer, the second voltage input terminal and the The input end of the compensation unit is connected.

Further, the adjustable capacitor includes an adjustable capacitor control terminal for receiving capacitance adjustment instructions, the switch includes a switch control terminal for receiving switching instructions, and the reactive power compensation device also includes a control unit, wherein:

The control unit is respectively connected to the adjustable capacitor control terminal and the switch control terminal, and is used to generate a capacitance adjustment command according to the current, voltage and power factor of the output electric energy of the voltage regulator detected by the monitoring unit and a switch instruction to adjust the capacitance value of the adjustable capacitor and turn on or off the switch.

Further, the two ends of the primary winding of the current booster are respectively used as the first terminal and the second terminal, and the two ends of the secondary winding of the current booster are respectively connected to the external device.

Further, the fixed capacitor is a self-healing capacitor.

Further, the adjustable capacitor is a self-healing capacitor.

The utility model also provides a transformer detection device, which includes the above-mentioned reactive power compensation device. The transformer detection device also includes a power supply device, and the power supply device is used to provide electric energy for the reactive power compensation device.

The reactive power compensation device and detection equipment provided by the embodiment of the utility model can adjust the electric energy of the external power supply through the voltage regulator, and the compensation unit can compensate the reactance of the load of the voltage regulator by using an adjustable capacitor group to improve the voltage regulator. The power factor at work can improve the voltage regulation effect of the voltage regulator. Using a voltage regulator with a smaller apparent power can also obtain a larger current, so that the current output by the current booster can meet the needs of the transformer verification, reduce the consumption of electric energy, and save energy.

In order to make the above-mentioned purpose, features and advantages of the present invention more comprehensible, preferred embodiments are specifically cited below, together with the accompanying drawings, and are described in detail as follows.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following drawings will be briefly introduced in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention. Therefore, it should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained according to these drawings without creative work.

Fig. 1 is a schematic diagram of a reactive power compensation device provided by an embodiment of the present invention.

Fig. 2 is a schematic circuit diagram of a reactive power compensation device provided by an embodiment of the present invention.

Fig. 3 is a schematic circuit diagram of another reactive power compensation device provided by an embodiment of the present invention.

Fig. 4 is a schematic diagram of a transformer detection device provided by an embodiment of the present invention.

Icons: 10-reactive power compensation device; 101-voltage regulator; 111-moving contact; 112-static contact; 102-monitoring unit; 121-voltage detection module; 122-current transformer; 123-current detection module; 124-power factor detection module; 1241, 1242-current input terminal; 103-compensation unit; 131-adjustable capacitor; 132-fixed capacitor; 133-switch; The second terminal; 105-control unit; 20-transformer detection equipment.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. . The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present utility model.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second" and so on are only used for distinguishing descriptions, and cannot be understood as indicating or implying relative importance.

The inventors found that when testing the transformers, current can be supplied to the standard and tested current transformers through the voltage regulator and current booster. In the verification of current transformers, the current booster is used as the load of the voltage regulator, which is an inductive load. The wires connected to each testing device also generate reactance during the conduction process due to the large current loaded. This leads to a very low power factor of the voltage regulator load. For example, in the verification of the current transformer, the current is generally required to rise to 12000A, which requires a 120KVA voltage regulator and its power supply. General laboratory power supplies have limited capacity and cannot meet such current requirements, and testing instruments will not be equipped with such a large-capacity voltage regulator.

In view of this, the embodiment of the present application provides a reactive power compensation device 10 , as shown in FIG. 1 and FIG. 2 , including a voltage regulator 101 , a monitoring unit 102 , a compensation unit 103 and an up-flow device 104 .

The voltage regulator 101 is respectively connected to the external power supply and the monitoring unit 102 for adjusting the voltage of the electric energy input by the external power supply. The voltage regulator 101 may include a voltage regulating winding, an input end of the voltage regulating winding is connected to the external power supply, and an output end of the voltage regulating winding may include a fixed contact 112 and a moving contact 111 . By adjusting the position of the movable contact 111 , the output power of the voltage regulator 101 can be adjusted. The specific model of the voltage regulator 101 can be selected according to actual needs, and the embodiment of the present application does not limit the specific parameters of the voltage regulator 101 .

The monitoring unit 102 is used to detect the current, voltage and power factor of the output electric energy of the voltage regulator 101 . Various parameters of the output electric energy of the voltage regulator 101 can be detected in real time through the monitoring unit 102 to provide data support for the adjustment of the compensation unit 103 .

In detail, the monitoring unit 102 includes a voltage detection module 121, a current transformer 122, a current detection module 123 and a power factor detection module 124, and the voltage detection module 121 is connected to the static contact 112 and the moving contact 111 respectively. , used to detect the voltage of the electrical energy output by the voltage regulator 101 . The voltage detection module 121 can be a mechanical or electronic voltmeter, the model of the voltmeter can be selected according to actual needs, and the range and detection accuracy of the voltmeter can be determined according to the detection requirements. It can be understood that the current transformer 122 can also be determined according to actual needs, so as to meet detection needs in different scenarios. The current detection module 123 can be a mechanical or electronic ammeter, and its specific detection accuracy and detection range can be determined according to actual needs. The power factor detection module 124 can be a power factor meter, and the specific model of the power factor meter can be determined according to actual needs, and the embodiment of the present application does not limit its specific parameters.

One end of the primary winding of the current transformer 122 is connected to the moving contact 111 , and the other end of the primary winding of the current transformer 122 is connected to the input end of the current booster 104 .

One end of the current detection module 123 is connected to one end of the secondary winding of the current transformer 122, and the other end of the current detection module 123 is connected to a current input terminal 1241 of the power factor detection module 124, the current The detection module 123 is used for detecting the current of the output electric energy of the voltage regulator 101 .

The other current input terminal 1242 of the power factor detection module 124 is connected to the other end of the secondary winding of the current transformer 122, and the voltage input terminal of the power factor detection module 124 is connected to the input of the current booster 104. The power factor detection module 124 is used to detect the power factor of the output electric energy of the voltage regulator 101 .

The compensation unit 103 is connected to the output terminal of the monitoring unit 102 for compensating the reactance of the load of the voltage regulator 101 . In detail, the compensation unit 103 includes at least one adjustable capacitor 131 , at least one fixed capacitor 132 , and at least one switch 133 .

The adjustable capacitor 131 and the fixed capacitor 132 are respectively connected in series with the corresponding switch 133 to form a parallel circuit, one end of the parallel circuit is used as the input end of the compensation unit 103, and the other end of the parallel circuit is used as the compensation unit The output terminal of 103 , the input terminal and the output terminal of the compensation unit 103 are respectively connected to the input terminal of the current booster 104 .

In another specific implementation manner, the adjustable capacitor 131 includes an adjustable capacitor control terminal for receiving capacitance adjustment instructions, and the switch 133 includes a switch control terminal for receiving switching instructions, as shown in FIG. 3 , The reactive power compensation device 10 also includes a control unit 105 .

In detail, the control unit 105 is respectively connected to the adjustable capacitor control terminal and the switch control terminal, and is used to obtain the current, voltage and power of the output electric energy of the voltage regulator 101 detected by the monitoring unit 102. factor, generate a capacitor adjustment command and a switch command, so as to adjust the capacitance value of the adjustable capacitor 131 and the closing or opening of the switch 133 .

After receiving the capacitance adjustment signal from the control unit 105, the adjustable capacitance control terminal of the adjustable capacitor 131 can adjust the capacitance value of the adjustable capacitor 131 to the capacitance value indicated by the instruction according to the specific content of the capacitance adjustment instruction. After the switch 133 in the compensation unit 103 receives the switching instruction, it can close the corresponding switch 133 according to the specific content of the switching instruction, or turn off the corresponding switch 133, so as to achieve different fixed capacitors 132 or adjustable capacitors 131 Access to the circuit to achieve different forms of capacity compensation.

By closing or opening the switch 133 in the compensation unit 103, the size of the compensation capacity can be adjusted. In a specific implementation manner, the capacitance of the fixed capacitors 132 can be reduced sequentially, or several fixed capacitors 132 can be divided into several groups, and the capacitance of each fixed capacitor 132 in each group is the same, and the difference between groups There is a certain gradient difference in capacitance between them. The embodiment of the present application does not limit the specific parameters of the fixed capacitor 132 and the adjustable capacitor 131 , and an appropriate fixed capacitor 132 and adjustable capacitor 131 can be selected according to actual needs.

The current booster 104 is connected to the voltage regulator 101, and is used to convert the current output by the voltage regulator 101 to a preset current and output it to an external device.

In detail, the input terminal of the current booster 104 includes a first terminal 141 and a second terminal 142, and the voltage input terminal of the power factor detection module 124 includes a first voltage input terminal and a second voltage input terminal, so The first terminal 141 is respectively connected to the static contact 112, the first voltage input terminal and the output terminal of the compensation unit 103, and the second terminal 142 is respectively connected to the primary winding of the current transformer 122. The other end, the second voltage input end is connected to the input end of the compensation unit 103 .

The two ends of the primary winding of the current booster 104 are respectively used as the first terminal 141 and the second terminal 142 , and the two ends of the secondary winding of the current booster 104 are respectively connected to the external device.

The working process of the above-mentioned reactive power compensation device 10 will be briefly described below.

When the reactive power compensation device 10 is working, the voltage regulator 101 is connected to an external power supply. After the power supply is turned on, the output terminal of the voltage regulator 101 can supply power to the current booster 104 . At this time, the power factor of the output electric energy of the voltage regulator 101 can be obtained by observing the reading of the power factor detection module 124 . At the same time, by closing different switches 133 in the compensation unit 103, the power factor of the output electric energy of the voltage regulator 101 is adjusted. When the power factor obtained by the power factor detection module 124 is close to 1, the switch 133 connected in series with the adjustable capacitor 131 in the compensation unit 103 is closed, and the capacitance value of the adjustable capacitor 131 is fine-tuned until the power factor detected by the power factor detection module 124 is The power factor reading is 1 or close to 1. At this point, the required current can be provided to the external device through the current booster 104 . In addition, the readings of the voltage detection module 121 and the current detection module 123 can also be recorded. When the output terminal of the current booster 104 provides a large current to the standard current transformer and the tested current transformer, the load capacity of the voltage regulator 101 is relatively small, and the voltage regulator 121 and the current detection module 123 can monitor the regulator in real time. The output capacity of the compressor 101.

The reactive power compensation device 10 provided in the embodiment of the present application can adjust the electric energy of the external power supply through the voltage regulator 101, and the compensation unit 103 can compensate the reactance of the load of the voltage regulator 101 by using an adjustable capacitor 131 group to improve voltage regulation. The power factor when the voltage regulator 101 is working can improve the voltage regulation effect of the voltage regulator 101. Using the voltage regulator 101 with a smaller apparent power can also obtain a larger current, so that the current output by the current booster 104 can meet the requirements of the current transformer verification, reduce the consumption of electric energy, and save energy.

As shown in Figure 4, the embodiment of the present application also provides a transformer detection device 20, including the above-mentioned reactive power compensation device 10, the transformer detection device also includes a power supply 21, the power supply 21 is used for the The reactive power compensation device provides electric energy.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model. It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

The above is only a specific embodiment of the present utility model, but the scope of protection of the present utility model is not limited thereto. Anyone familiar with the technical field can easily think of changes or changes within the technical scope disclosed by the utility model Replacement should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (10)

1. A reactive power compensation device, characterized in that it comprises a voltage regulator, a monitoring unit, a compensation unit and a current riser, wherein: The voltage regulator is respectively connected to the external power supply and the monitoring unit, and is used to adjust the electric energy input by the external power supply, and output the adjusted electric energy to the current booster; The monitoring unit is used to detect the current, voltage and power factor of the output electric energy of the voltage regulator; The compensation unit is connected to the output terminal of the monitoring unit, and the compensation unit includes an adjustable capacitor group with adjustable capacitance value, and the compensation unit is used to compensate the reactance of the voltage regulator load through the adjustable capacitor group; The current booster is connected with the voltage regulator, and is used for converting the current output by the voltage regulator to a preset current and outputting it to an external device. 2. The reactive power compensation device according to claim 1, wherein the voltage regulator comprises a voltage regulating winding, the input end of the voltage regulating winding is connected to the external power supply, and the output of the voltage regulator Terminals include static contacts and moving contacts; The monitoring unit includes a voltage detection module, which is respectively connected to the static contact and the movable contact, and is used to detect the voltage of the output electric energy of the voltage regulator. 3. The reactive power compensation device according to claim 2, wherein the monitoring unit further comprises a current transformer, a current detection module and a power factor detection module, wherein: One end of the primary winding of the current transformer is connected to the moving contact, and the other end of the primary winding of the current transformer is connected to the input end of the current booster; One end of the current detection module is connected to one end of the secondary winding of the current transformer, and the other end of the current detection module is connected to a current input end of the power factor detection module. The current detection module is used to detect The current of the output electric energy of the voltage regulator; The other current input terminal of the power factor detection module is connected to the other end of the secondary winding of the current transformer, the voltage input terminal of the power factor detection module is connected to the input terminal of the current booster, and the power The factor detection module is used to detect the power factor of the output electric energy of the voltage regulator. 4. The reactive power compensation device according to claim 3, wherein the adjustable capacitor group includes at least one adjustable capacitor, at least one fixed capacitor, and at least one switch, wherein: The adjustable capacitor and the fixed capacitor are respectively connected in series with the corresponding switches to form a parallel circuit, one end of the parallel circuit is used as the input end of the compensation unit, and the other end of the parallel circuit is used as the output end of the compensation unit, The input end and the output end of the compensation unit are respectively connected to the input end of the current booster. 5. The reactive power compensation device according to claim 4, characterized in that, the input terminal of the current booster includes a first terminal and a second terminal, and the voltage input terminal of the power factor detection module includes a first terminal A voltage input terminal and a second voltage input terminal, the first terminal is respectively connected to the static contact, the first voltage input terminal and the output terminal of the compensation unit, and the second terminal is respectively connected to the current The other end of the primary winding of the transformer, the second voltage input end and the input end of the compensation unit are connected. 6. The reactive power compensation device according to claim 4, wherein the adjustable capacitor includes an adjustable capacitor control terminal for receiving capacitance adjustment instructions, and the switch includes a switch control terminal for receiving switching instructions , the reactive power compensation device also includes a control unit, wherein: The control unit is respectively connected to the adjustable capacitor control terminal and the switch control terminal, and is used to generate a capacitance adjustment command according to the current, voltage and power factor of the output electric energy of the voltage regulator detected by the monitoring unit and a switch instruction to adjust the capacitance value of the adjustable capacitor and turn on or off the switch. 7. The reactive power compensation device according to claim 5, characterized in that, the two ends of the primary winding of the current booster are respectively used as the first terminal and the second terminal, and the Both ends of the secondary winding are respectively connected to the external device. 8. The reactive power compensation device according to any one of claims 4 to 7, characterized in that the fixed capacitor is a self-healing capacitor. 9. The reactive power compensation device according to any one of claims 4 to 7, characterized in that the adjustable capacitor is a self-healing capacitor. 10. A transformer detection device, characterized in that it includes the reactive power compensation device described in any one of claims 1 to 9, and the transformer detection device also includes a power supply device, and the power supply device is used to provide power for the reactive power The power compensation device provides electric energy.