Test method for measuring on-site long-time induced voltage and partial discharge of 1000kV shunt reactor

Abstract

The invention discloses a test method for measuring on-site long-time induced voltage and partial discharge of a 1000kV shunt reactor, and discloses a test system with the test method for measuring on-site long-time induced voltage and partial discharge of the shunt reactor. According to the paralleling reactor on-site long-time induced voltage and partial discharge measurement test method, the test is carried out by using an ultra-high voltage transmission line, the investment amount of test equipment is greatly reduced, test wiring is simplified, the workload of a resonance test carried out by adopting a special test compensation capacitor traditionally is reduced, the test efficiency is improved, and the test cost is reduced. Meanwhile, interference signals caused by corona of a line framework are reduced, the characteristics of partial discharge signals of an equipment body are restored to the maximum extent, and the internal insulation state of the tested reactor can be effectively and truly judged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high voltage technology, in particular to a 1000kV shunt reactor field long-time induced voltage and partial discharge measurement test method. BACKGROUND

[0002] The 1000kV shunt reactor for AC system carries out long-time induced voltage test with partial discharge measurement on site of the EHV substation to determine whether there is insulation defect in the process of transportation and installation, but the 1000kV shunt reactor has high test voltage, large capacity and high reactance value, and the requirement for test equipment is extremely high when carrying out long-time induced voltage test with partial discharge measurement on site, a large number of capacitors need to be used for compensation, the capacitors have large weight and large floor area, and the test system is complex, so the test is difficult to carry out. At present, the long-time induced voltage test with partial discharge measurement on site of the 1000kV shunt reactor for AC system has not been carried out at home and abroad, and there is a technical gap. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a 1000kV shunt reactor field long-time induced voltage and partial discharge measurement test method, which can replace the compensation capacitor bank with the existing EHV transmission line on site, greatly reducing the workload of the traditional resonance test using special compensation capacitor bank, reducing the requirement for test equipment, and effectively shortening the test time.

[0004] The present application also provides a test system for implementing the above-mentioned 1000kV shunt reactor field long-time induced voltage and partial discharge measurement test method.

[0005] The 1000kV shunt reactor field long-time induced voltage and partial discharge measurement test method according to the first aspect of the present application is characterized in that it comprises the following steps:

[0006] Obtaining the inductance value and test voltage of the tested reactor;

[0007] Calculating the test resonance frequency according to the inductance value and the capacitance value of the EHV transmission line;

[0008] If the resonance frequency does not meet the preset range, the length of the EHV transmission line is reselected, and the resonance frequency and the test current are recalculated until the resonance frequency meets the preset range;

[0009] Connecting the frequency conversion power supply, the intermediate transformer, the EHV transmission line and the tested reactor in sequence, and connecting the high-voltage bushing of the tested shunt reactor between the EHV transmission line and the tested shunt reactor;

[0010] The local discharge measuring device using pulse current method is connected through the end screen of the high-voltage bushing.

[0011] The output frequency of the variable frequency power supply is adjusted to be equal to the resonance frequency, so that the test loop is in a resonance state, and the long-time induced voltage test is performed under the condition that the test voltage is gradually boosted to the test voltage, and the local discharge is measured based on the local discharge measuring device.

[0012] The parallel reactor field long-time induced voltage and local discharge measurement test method according to the embodiments of the present application has at least the following beneficial effects: the method can be used to carry out the test on the UHV transmission line, greatly reduces the test equipment investment amount, simplifies the test wiring, reduces the workload of the traditional resonance test using a special test compensation capacitor, and improves the test efficiency.

[0013] According to some embodiments of the present application, the calculation formula of the test resonance frequency is:

[0014]

[0015] Wherein, L is the inductance value of the test reactor, and C is the capacitance value of the UHV transmission line.

[0016] According to some embodiments of the present application, the preset frequency range of the resonance frequency is 100Hz to 300Hz.

[0017] According to some embodiments of the present application, the test voltage is Wherein U m is the highest operating voltage of the system.

[0018] According to some embodiments of the present application, the high-voltage bushing of the test parallel reactor is connected between the wave-trapping reactor and the test parallel reactor.

[0019] According to some embodiments of the present application, the local discharge measuring device is further connected with a space corona coupling antenna and a signal conversion device thereof, and the local discharge measurement signal of the test reactor is synchronized with the signal collected by the space corona coupling antenna, and the space corona interference signal is filtered synchronously during the measurement process.

[0020] According to some embodiments of the present application, the local discharge measuring device uses the pulse current method to detect and analyze the local discharge signal.

[0021] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0022] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings of which:

[0023] Figure 1 A step schematic diagram of the parallel reactor field long-time induced voltage and partial discharge measurement test method of the embodiment of the present application;

[0024] Figure 2 For Figure 1 A total framework schematic diagram of the parallel reactor field long-time induced voltage and partial discharge measurement test system of the embodiment of the present application is shown; ① - test frequency power supply; ② - intermediate transformer; ③ - extra-high voltage transmission line; ④ - wave arrestor reactor; ⑤ - test parallel reactor high voltage bushing; ⑥ - test parallel reactor; ⑦ - capacitance voltage divider; ⑧ - pulse current method detection impedance; ⑨ - partial discharge measurement device; ⑩ - signal converter; - spatial corona coupling antenna. DETAILED DESCRIPTION

[0025] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0026] In the description of the present application, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0027] In the description of the present application, the meaning of several is one or more, and the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, and above, below, etc. are understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0028] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0029] To solve the problem that the prior art lacks long-time induced voltage test with partial discharge measurement in 1000kV AC system, the present application proposes a method of using UHV transmission line as a capacitor compensation to carry out long-time induced voltage test with partial discharge measurement of field reactor, in combination with the field conditions of UHV substation, and proposes a measure against external interference of partial discharge in view of the problem that UHV transmission line is prone to corona, so that the long-time induced voltage test with partial discharge measurement of field reactor in 1000kV AC system can be carried out efficiently and quickly.

[0030] Embodiment one,

[0031] As Figure 1 shown, the embodiment of the present application provides a method for long-time induced voltage and partial discharge measurement test of field reactor, comprising:

[0032] Step S100, obtaining the inductance value and test voltage of the tested reactor.

[0033] Step S200, calculating the test resonance frequency according to the inductance value and the capacitance value of the UHV transmission line;

[0034] Step S300, if the resonance frequency does not meet the preset range, the length of the UHV transmission line is reselected, and the resonance frequency and the test current are recalculated until the resonance frequency meets the preset range;

[0035] Step S400, building a test loop, connecting the frequency conversion power supply, the intermediate transformer, the UHV transmission line and the tested reactor in sequence, and connecting the high-voltage bushing of the tested reactor between the UHV transmission line and the tested reactor;

[0036] Step S500, connecting the partial discharge measurement device using pulse current method through the end screen of the high-voltage bushing;

[0037] Step S600, adjusting the output frequency of the frequency conversion power supply to make the test loop reach the resonance state, gradually increasing the voltage to the test voltage, and carrying out long-time induced voltage test and measuring partial discharge based on the partial discharge measurement device.

[0038] Specifically, in order to prove the effectiveness of the above-mentioned embodiment, the method of the above-mentioned embodiment is applied to a specific AC system, and the following long-time induced voltage and partial discharge measurement system of field reactor is obtained.

[0039] Embodiment two,

[0040] The application discloses a test system for long-time induced voltage test with partial discharge measurement of a shunt reactor for a 1000kV AC system in a UHV substation, and the main system comprises a frequency conversion power supply, an intermediate transformer, a voltage divider, a UHV transmission line, a wave arrestor, a space corona coupling antenna and a partial discharge measurement device.

[0041] The wiring principle diagram is shown in the figure. Figure 2

[0042] The steps include:

[0043] Step A100, obtaining the inductance value of the tested reactor and the test voltage.

[0044] According to the regulations of GB / T 1094.3-2017 and GB / T 50832-2013, the maximum voltage value of the long-time induced voltage test with partial discharge measurement of the shunt reactor for the 1000kV AC system in the field is 1.5Um / = 953kV.

[0045] Step A200, calculating the test resonance frequency according to the inductance value and the capacitance value of the UHV transmission line, and the calculation formula is:

[0046] Step A300, if the resonance frequency does not meet the preset range, the length of the UHV transmission line is reselected, and the resonance frequency and the test current are recalculated until the resonance frequency meets the preset range.

[0047] Generally, the general test frequency is between 100-300Hz. According to the inductance value 5.35H of the tested reactor and the capacitance 75.8nF of the UHV transmission line, the resonance frequency is about 250Hz, which meets the frequency between 100Hz-300Hz.

[0048] Step A400, connecting a wave arrestor in series between the high-voltage sleeve of the tested reactor and the UHV transmission line.

[0049] Preferably, the wave arrestor connected in series between the high-voltage sleeve of the tested reactor and the UHV transmission line can reduce the interference signal caused by the line structure corona.

[0050] Step A500, connecting the partial discharge test measurement device adopting the pulse current method through the end screen of the high-voltage sleeve of the tested reactor.

[0051] Step A600, connecting the space corona coupling antenna and the signal conversion device signal line to the partial discharge test measurement device.

[0052] Step A700, synchronizing the partial discharge measurement signal of the tested reactor body with the space corona coupling antenna measurement signal, and filtering the space corona coupling antenna measurement signal synchronously during the measurement.​

[0053] Then follow Figure 2 The following components are represented: ①-Test frequency converter; ②-Intermediate transformer; ③-UHV transmission line; ④-Suppressor reactor; ⑤-High voltage bushing of the tested shunt reactor; ⑥-Test shunt reactor; ⑦-Capacitive voltage divider; ⑧-Impedance detection by pulse current method; ⑨-Partial discharge measurement device; ⑩-Signal converter; - Connect the space corona coupling antenna.

[0054] The signal input terminal for impedance detection using the pulse current method is the end screen of the high-voltage bushing of the tested shunt reactor, and the signal input terminal for the signal converter is the output of the space corona coupling antenna. Other test system components are connected via wires.

[0055] Step A800: Increase the voltage of the test system and simultaneously adjust the frequency of the inverter power supply output voltage until the entire test circuit reaches resonance. Finally, gradually increase the voltage to the test voltage and conduct a long-term induced voltage test with partial discharge measurement.

[0056] Then, the frequency is adjusted by the test frequency converter, the voltage is increased by the intermediate transformer, and the voltage on the high-voltage side of the test system is measured by the capacitor voltage divider to see if it meets the test requirements. The interference signals of the line and space corona are filtered out by the wave blocking reactor and the space corona coupling antenna. The interference signals of partial discharge are filtered out by the capacitor voltage divider and the partial discharge measurement device. Finally, the field long-term induced voltage test with partial discharge measurement of the parallel reactor for 1000kV AC system is carried out.

[0057] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0058] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0059] The above is a detailed description of the preferred embodiments of this application. However, this application is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A 1000 kV shunt reactor field long-time induced voltage and partial discharge measurement test method, characterized in that, The method comprises the following steps: acquiring an inductance value of a test reactor and a test voltage; calculating a test resonance frequency according to the inductance value and a capacitance value of an UHV transmission line; if the resonance frequency does not meet a preset range, reselecting a length of the UHV transmission line, recalculating the resonance frequency and a test current, until the resonance frequency meets the preset range; sequentially connecting a variable frequency power supply, an intermediate transformer, the UHV transmission line and the test reactor, and connecting a test reactor high voltage bushing between the UHV transmission line and the test reactor shunt reactor; connecting a partial discharge measuring device adopting a pulse current method through a terminal screen of the high voltage bushing; adjusting an output frequency of the variable frequency power supply to be equal to the resonance frequency, so that a test loop reaches a resonance state, gradually boosting to a condition of the test voltage, performing a long-time induced voltage test and measuring partial discharge based on the partial discharge measuring device.

2. The test method of claim 1, wherein, A calculation formula of the test resonance frequency f is: wherein L is the inductance value of the test reactor, and C is the capacitance value of the UHV transmission line.

3. The test method of claim 1, wherein The preset range of the resonance frequency is 100 Hz to 300 Hz.

4. The test method of claim 1, wherein, The test voltage is where U m is the maximum operating voltage of the system.

5. The test method of claim 1, wherein, The test reactor high voltage bushing is connected in series between the test reactor shunt reactor and a wave arrestor, and the test reactor shunt reactor high voltage bushing is connected between the wave arrestor and the test reactor shunt reactor.

6. The method of claim 1, wherein, The partial discharge measuring device is further connected with a space corona coupling antenna and a signal conversion device thereof, and synchronizes partial discharge measurement signals of the test reactor with signals collected by the space corona coupling antenna, and synchronously filters space corona interference signals in a measurement process.

7. The test method of claim 1, wherein The partial discharge measuring device adopts a pulse current method to detect and analyze partial discharge signals.

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