CN216248208U - Sampling output conversion device for GIS same-frequency same-phase voltage withstand test - Google Patents
Sampling output conversion device for GIS same-frequency same-phase voltage withstand test Download PDFInfo
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- CN216248208U CN216248208U CN202122148779.XU CN202122148779U CN216248208U CN 216248208 U CN216248208 U CN 216248208U CN 202122148779 U CN202122148779 U CN 202122148779U CN 216248208 U CN216248208 U CN 216248208U
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Abstract
The utility model discloses a sampling output conversion device for a GIS (geographic information System) same-frequency same-phase withstand voltage test, and particularly relates to the technical field of GIS power, wherein the sampling output conversion device comprises a voltage transformer, a PT merging unit, a photoelectric converter, a digital/analog conversion circuit, a power amplifier, a booster, a protection module, a display unit and a main control chip; the voltage transformer comprises at least one group of high-voltage windings and at least one group of low-voltage windings, the high-voltage windings are electrically connected with a bus of the GIS, and the other end of the high-voltage windings is grounded; the PT merging unit is connected with the low-voltage winding and converts an electric signal into a digital sampling signal, and the merging unit is connected with the main control chip through an FPGA circuit. According to the GIS same-frequency same-phase voltage withstand test sampling output conversion device, the protection device is arranged, so that the situation that various emergencies in the same-frequency same-phase voltage withstand test cause the breakdown of the isolation fracture to generate adverse effects on adjacent running parts and cause dangers to experimental equipment and human bodies is effectively avoided.
Description
Technical Field
The utility model relates to the technical field of GIS electric power, in particular to a sampling output conversion device for a GIS same-frequency same-phase voltage withstand test.
Background
Gas insulated metal enclosed switchgear (GIS for short) has the advantages of small floor area, small influence from external environmental conditions, high reliability and the like, and is widely used in urban power grids in China. Particularly, with the acceleration of economic development and urbanization process in China, the demand of GIS equipment is increased rapidly.
One of the primary conditions for performing the same-frequency and same-phase voltage withstand test is that the operating voltage of the bus adjacent equipment (such as the secondary side voltage of the bus voltage transformer) is required to be used as a reference voltage. However, the method is only suitable for a conventional substation, that is, only suitable for a situation where an analog signal is output from a voltage transformer for the second time, but cannot be applied to an intelligent substation, because the intelligent substation is usually configured with a digital voltage transformer, and usually has no conventional voltage transformer, that is, has no secondary signal from the voltage transformer, and cannot obtain a reference voltage on an operation side. The digital voltage transformer is usually used in combination with a merging unit, the merging unit collects or merges output signals of a plurality of transformers to obtain instantaneous values of current and voltage of an electric power system, and transmits the instantaneous values to an electric power system electrical measuring instrument and relay protection equipment according to determined data, each data channel of the digital voltage transformer can transmit sampling value data of one or more current and voltage transformers, digital quantity signals output by an electronic voltage transformer and an electronic current transformer can be collected or merged, analog signals output by a traditional voltage transformer and a traditional current transformer or analog small signals output by the electronic transformer can be collected and sampled, and the analog small signals are transmitted.
However, the conventional protection mode cannot meet the protection requirements of the same-frequency and same-phase voltage withstand test, and in the protection mode, if the same-frequency and same-phase failure occurs in the test process (i.e., the test voltage and the reference voltage change in frequency phase and are asynchronous), the reverse of the test voltage and the reference voltage may cause the breakdown of the isolation switch under severe conditions, so that the fault of the live-line operation part is caused. In this case, the protection does not operate, and the device cannot be protected. Therefore, a sampling output conversion device for a GIS same-frequency same-phase voltage withstand test is provided.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide a sampling output conversion device for a GIS same-frequency same-phase voltage withstand test, which can effectively solve the problems in the background technology.
In order to achieve the purpose, the utility model adopts the technical scheme that:
a sampling output conversion device for a GIS common-frequency and same-phase voltage withstand test comprises a voltage transformer, a PT merging unit, a photoelectric converter, a digital/analog conversion circuit, a power amplifier, a booster, a protection module, a display unit and a main control chip;
the voltage transformer comprises at least one group of high-voltage windings and at least one group of low-voltage windings, the high-voltage windings are electrically connected with a bus of the GIS, and the other end of the high-voltage windings is grounded; the PT merging unit is connected with the low-voltage winding and converts an electric signal into a digital sampling signal, the photoelectric converter is connected with the output end of the PT merging unit through an optical fiber, the merging unit is connected with the main control chip through an FPGA circuit, and the main control chip is electrically connected with the digital/analog conversion circuit, the power amplifier, the booster, the protection module and the display unit through circuits;
the protection module at least comprises a protection device and an oscilloscope, and the protection device is further provided with a reference voltage input end, a test voltage input end, an optical fiber signal output end and a control signal input end.
As a further technical solution of the present invention, in the protection device, the reference voltage input terminal is connected to at least one low-voltage winding of the PT merging unit, the test voltage input terminal is connected to the output terminal of the booster, the optical fiber signal output terminal is connected to the input terminal of the same-frequency and same-phase test power supply through an optical fiber, the control signal output terminal is connected to the communication signal input terminal of the same-frequency and same-phase test power supply, and the detection signal output terminal of the protection device is connected to the input terminal of the oscilloscope.
As a further technical solution of the present invention, the digital/analog conversion circuit outputs three low voltage signals at the same time, and the three low voltage signals output at the same time by the digital/analog conversion circuit correspond to three-phase voltages of the GIS, respectively, and have the same phase and the same frequency as the three-phase voltages of the GIS, respectively, the three low voltage signals output at the same time by the digital/analog conversion circuit are selected by a selection switch that selects one of three gears, and after power is amplified by a power amplifier and the voltage is boosted by a transformer, a voltage analog quantity corresponding to the selected bus-line phase voltage of a certain phase is obtained.
As a further technical solution of the present invention, an input terminal of the display unit is fixedly connected to an output terminal of the booster through a circuit for displaying a voltage value, a frequency, and a phase.
As a further technical scheme of the utility model, at least two oscilloscopes are arranged and are respectively used for observing the waveforms of the reference voltage and the test voltage in real time.
As a further technical solution of the present invention, the protection device further includes at least two signal input ports, and the at least two signal input ports respectively input a buck-boost and start-stop control signal of the same-frequency and same-phase test power supply and a power supply voltage protection fixed value signal for protecting the whole device.
As a further technical solution of the present invention, the PT merging unit is provided with an optical fiber interface and an RJ45 network interface.
As a further technical solution of the present invention, the sampling frequency of the PT merging unit is 4000HZ, and the data sampling rate of the PT merging unit is 80 points/cycle.
As a further technical scheme of the utility model, the same-frequency same-phase withstand voltage test sampling output conversion device is externally provided with a power supply, and the power supply is 198-242V alternating current.
Compared with the prior art, the utility model has the following beneficial effects:
according to the utility model, through the PT merging unit sampling output conversion device, digital signals are extracted from a transformer merging unit in an intelligent substation through optical fibers, and after conversion processing, a low-voltage signal which has the same frequency as the phase voltage frequency of a bus and is in proportion to the amplitude is generated and sent to a same-frequency and same-phase voltage-withstanding test system to be used as reference voltage, so that a same-frequency and same-phase voltage-withstanding test is completed.
Drawings
Fig. 1 is a schematic block diagram of a sampling output conversion device for a GIS common-frequency in-phase withstand voltage test of the present invention.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While specific embodiments of the utility model are shown in the drawings, it should be understood that the utility model may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the utility model, but is made for the purpose of illustrating the general principles of the utility model and not for the purpose of limiting the scope of the utility model. The scope of the present invention is defined by the appended claims.
For the purpose of facilitating understanding of the embodiments of the present invention, the following description will be made by taking specific embodiments as examples with reference to the accompanying drawings, and the drawings are not to be construed as limiting the embodiments of the present invention.
As shown in fig. 1, a sampling output conversion device for a GIS common-frequency in-phase withstand voltage test includes a voltage transformer, a PT merging unit, a photoelectric converter, a digital/analog conversion circuit, a power amplifier, a booster, a protection module, a display unit, and a main control chip;
the voltage transformer comprises at least one group of high-voltage windings and at least one group of low-voltage windings, the high-voltage windings are electrically connected with a bus of the GIS, and the other end of the high-voltage windings is grounded; the PT merging unit is connected with the low-voltage winding and converts an electric signal into a digital sampling signal, the photoelectric converter is connected with the output end of the PT merging unit through an optical fiber, the merging unit is connected with the main control chip through an FPGA circuit, and the main control chip is electrically connected with the digital/analog conversion circuit, the power amplifier, the booster, the protection module and the display unit through circuits;
the protection module at least comprises a protection device and an oscilloscope, and the protection device is further provided with a reference voltage input end, a test voltage input end, an optical fiber signal output end and a control signal input end.
In the protection device, the reference voltage input end is connected with at least one low-voltage winding of the PT merging unit, and the obtained voltage is used as a reference voltage; the test voltage input end is connected with the output end of the booster and used for outputting a reference voltage signal with the same frequency and the same phase as the reference voltage; the optical fiber signal output end is connected with the input end of the same-frequency same-phase test power supply through an optical fiber and is used for outputting various protection signals; the control signal output end is connected with the communication signal input end of the same-frequency same-phase test power supply, the detection signal output end of the protection device is connected with the input end of the oscilloscope, and the waveforms of the test voltage and the reference voltage can be observed through the oscilloscope.
The digital/analog conversion circuit outputs three low-voltage signals simultaneously, the three low-voltage signals are respectively corresponding to three-phase voltages of the GIS, the three low-voltage signals output simultaneously by the digital/analog conversion circuit are respectively the same as the three-phase voltages of the GIS in phase and have the same frequency, the three low-voltage signals output simultaneously by the digital/analog conversion circuit are selected by a selection switch which selects one of three gears, a voltage analog quantity corresponding to the selected bus phase voltage of a certain phase is obtained after power amplification by a power amplifier and voltage boosting by a transformer, the rated output voltage of the voltage analog quantity is 57.7V and is consistent with the voltage of the secondary side of a conventional voltage transformer, and the signal is used as a reference voltage of an operation side and is supplied to a same-frequency and same-phase voltage withstand test.
And the input end of the display unit is fixedly connected with the output end of the booster through a circuit and is used for displaying a voltage value, frequency and phase.
The oscilloscope is provided with at least two oscilloscopes, and the oscilloscopes are used for observing the waveforms of the reference voltage and the test voltage in real time respectively.
The protection device also comprises at least two signal input ports, wherein the at least two signal input ports are respectively used for inputting a buck-boost and start-stop control signal of the same-frequency same-phase test power supply and a power supply voltage protection fixed value signal for protecting the whole device.
In the utility model, the protection device specifically works as follows: the protection device is controlled by the main control chip, at least two signal input ports are used for respectively inputting a boost-buck and start-stop control signal of a same-frequency and same-phase test power supply and a power supply voltage protection constant value signal for protecting the whole device, the protection device is used for protection control judgment, the protection device collects test voltage and reference voltage, the phase and the frequency are aligned and compared, a judgment signal is generated, the judgment signal is sent to the main control chip, the main control chip outputs control information to the same-frequency and same-phase test power supply according to the judgment signal, the voltage is controlled to be boosted and started and stopped in real time, and good protection effect can be achieved on the whole device.
The PT merging unit is provided with an optical fiber interface and an RJ45 network interface.
The sampling frequency of the PT merging unit is 4000HZ, and the data sampling rate of the PT merging unit is 80 points/cycle.
The same-frequency and same-phase withstand voltage test sampling output conversion device is provided with an external power supply, and the power supply is 198-242V alternating current.
It should be noted that the utility model relates to a sampling output conversion device for a GIS common-frequency and same-phase withstand voltage test, which specifically works as follows: the PT merging unit sampling output conversion device receives one path of optical fiber Ethernet port digital sampling signals output by the merging unit, outputs 3 paths of low voltage signals through a digital/analog conversion circuit simultaneously, corresponds to three-phase voltage on a bus side respectively, and obtains a voltage analog quantity corresponding to the selected bus phase voltage of a certain phase after power amplification and transformer boosting through a selection switch of 1 from 3, wherein the rated output voltage of the voltage analog quantity is 57.7V and is consistent with the voltage of the secondary side of a conventional voltage transformer, and the signal is used as reference voltage on the operation side and is supplied to a same-frequency same-phase voltage withstand test.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (9)
1. A GIS same-frequency same-phase voltage withstand test sampling output conversion device is characterized by comprising a voltage transformer, a PT merging unit, a photoelectric converter, a digital/analog conversion circuit, a power amplifier, a booster, a protection module, a display unit and a main control chip;
the voltage transformer comprises at least one group of high-voltage windings and at least one group of low-voltage windings, the high-voltage windings are electrically connected with a bus of the GIS, and the other end of the high-voltage windings is grounded; the PT merging unit is connected with the low-voltage winding and converts an electric signal into a digital sampling signal, the photoelectric converter is connected with the output end of the PT merging unit through an optical fiber, the merging unit is connected with the main control chip through an FPGA circuit, and the main control chip is electrically connected with the digital/analog conversion circuit, the power amplifier, the booster, the protection module and the display unit through circuits;
the protection module at least comprises a protection device and an oscilloscope, and the protection device is further provided with a reference voltage input end, a test voltage input end, an optical fiber signal output end and a control signal input end.
2. The GIS same-frequency same-phase voltage withstand test sampling output conversion device according to claim 1, characterized in that: in the protection device, the reference voltage input end is connected with at least one low-voltage winding of the PT merging unit, the test voltage input end is connected with the output end of the booster, the optical fiber signal output end is connected with the input end of the same-frequency same-phase test power supply through an optical fiber, the control signal output end is connected with the communication signal input end of the same-frequency same-phase test power supply, and the detection signal output end of the protection device is connected with the input end of the oscilloscope.
3. The GIS same-frequency same-phase voltage withstand test sampling output conversion device according to claim 1, characterized in that: the digital/analog conversion circuit outputs three low-voltage signals at the same time, the three low-voltage signals respectively correspond to three-phase voltages of the GIS, the three low-voltage signals output at the same time by the digital/analog conversion circuit are respectively the same as the three-phase voltages of the GIS in phase, the frequency is the same firstly, the three low-voltage signals output at the same time by the digital/analog conversion circuit are selected by a selection switch which selects one from three gears, the power is amplified by a power amplifier, and the voltage is boosted by a transformer, so that a voltage analog quantity corresponding to the selected bus-line phase voltage of a certain phase is obtained.
4. The GIS same-frequency same-phase voltage withstand test sampling output conversion device according to claim 1, characterized in that: and the input end of the display unit is fixedly connected with the output end of the booster through a circuit and is used for displaying a voltage value, frequency and phase.
5. The GIS same-frequency same-phase voltage withstand test sampling output conversion device according to claim 1, characterized in that: the oscilloscope is provided with at least two oscilloscopes, and the oscilloscopes are used for observing the waveforms of the reference voltage and the test voltage in real time respectively.
6. The GIS same-frequency same-phase voltage withstand test sampling output conversion device according to claim 2, characterized in that: the protection device also comprises at least two signal input ports, wherein the at least two signal input ports are respectively used for inputting a buck-boost and start-stop control signal of the same-frequency same-phase test power supply and a power supply voltage protection fixed value signal for protecting the whole device.
7. The GIS same-frequency same-phase voltage withstand test sampling output conversion device according to claim 1, characterized in that: the PT merging unit is provided with an optical fiber interface and an RJ45 network interface.
8. The GIS same-frequency same-phase voltage withstand test sampling output conversion device according to claim 1, characterized in that: the sampling frequency of the PT merging unit is 4000HZ, and the data sampling rate of the PT merging unit is 80 points/cycle.
9. The GIS same-frequency same-phase voltage withstand test sampling output conversion device according to claim 1, characterized in that: the same-frequency and same-phase withstand voltage test sampling output conversion device is provided with an external power supply, and the power supply is 198-242V alternating current.
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| CN202122148779.XU CN216248208U (en) | 2021-09-07 | 2021-09-07 | Sampling output conversion device for GIS same-frequency same-phase voltage withstand test |
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| CN202122148779.XU CN216248208U (en) | 2021-09-07 | 2021-09-07 | Sampling output conversion device for GIS same-frequency same-phase voltage withstand test |
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