CN214097605U - Overvoltage test circuit for SF6 circuit breaker switching dry-type air-core reactor - Google Patents
Overvoltage test circuit for SF6 circuit breaker switching dry-type air-core reactor Download PDFInfo
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- CN214097605U CN214097605U CN202022648739.7U CN202022648739U CN214097605U CN 214097605 U CN214097605 U CN 214097605U CN 202022648739 U CN202022648739 U CN 202022648739U CN 214097605 U CN214097605 U CN 214097605U
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- 238000012360 testing method Methods 0.000 title claims abstract description 32
- 229910018503 SF6 Inorganic materials 0.000 claims abstract description 44
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims abstract description 44
- 230000007935 neutral effect Effects 0.000 claims abstract description 20
- 229960000909 sulfur hexafluoride Drugs 0.000 claims abstract description 12
- 239000004593 Epoxy Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 6
- 239000000725 suspension Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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Abstract
The utility model discloses an SF6 circuit breaker switching dry-type air-core reactor overvoltage test circuit, which belongs to the overvoltage test field, tests by matching a capacitive voltage divider with a digital oscilloscope, the neutral point of a dry-type air-core parallel reactor group consisting of A-phase, B-phase and C-phase reactors is not grounded, and four capacitive voltage dividers of the same model are installed at the high-voltage end of a A, B, C three-phase reactor of the dry-type air-core parallel reactor group and the neutral point of the reactor in a point-to-ground manner; and the voltage of the high-voltage end of each phase reactor is differed from the voltage of the neutral point of the reactor to obtain the voltage of each phase reactor. The digital oscilloscope adopts an A-phase reactor waveform rising slope edge triggering working mode, the triggering voltage of the digital filter is set to be slightly higher than the steady-state working voltage of the dry-type hollow parallel reactor, then the sulfur hexafluoride SF6 circuit breaker switching operation is carried out, and the digital oscilloscope automatically records the voltage waveform which is switched in or out each time to complete the overvoltage test.
Description
Technical Field
The utility model belongs to overvoltage test field, concretely relates to SF6 circuit breaker switching dry-type air-core reactor overvoltage test circuit.
Background
In the application of electric system reactors, dry-type air-core reactors are most widely applied, but in recent years, a grid system has a dry-type air-core reactor burning loss fault, the dry-type air-core reactor fault is mostly generated at a weak or defective part of encapsulation or turn-to-turn insulation, frequent switching of the dry-type air-core parallel reactor leads to continuous development and deterioration of the defect, and therefore switching overvoltage is a direct cause for accelerating or causing the dry-type air-core reactor fault. At present, most of switching overvoltage of the dry-type hollow shunt reactor is concentrated on theoretical calculation and simulation research, and few of the switching overvoltage are actually measured on site, but due to the limitation of the precision and sampling frequency of a testing instrument, the measured result cannot verify the real overvoltage level of the switching dry-type hollow shunt reactor. In addition, researchers actually measure the overvoltage level of a vacuum circuit breaker switching dry-type hollow shunt reactor on site, but the switch for switching the dry-type hollow shunt reactor is mostly an SF6 circuit breaker at present, and people do not find the actual measurement.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a no field test precedent of present SF6 circuit breaker switching dry-type hollow shunt reactor, for studying SF6 circuit breaker switching dry-type hollow shunt reactor overvoltage level to adapt to modern power system's requirement, and provide an SF6 circuit breaker switching dry-type hollow reactor overvoltage test circuit, provide the foundation for follow-up power system explores effective suppression safeguard measure.
In order to achieve the above purpose, the utility model adopts the following technical scheme: SF6 circuit breaker switching dry-type air-core reactor overvoltage test circuit, its characterized in that, this test circuit includes: the device comprises three-phase lines, a circuit breaker, a dry type hollow parallel reactor group, a capacitive voltage divider, a matching resistor, a coaxial cable, a digital oscilloscope and a UPS (uninterrupted power supply), wherein the three lines of the three-phase lines are A, B, C three phases respectively; the circuit breaker is composed of three sulfur hexafluoride SF6 circuit breakers, incoming terminals of the three sulfur hexafluoride SF6 circuit breakers are respectively connected to the A, B, C three phases of the three-phase line, and outgoing terminals of the three sulfur hexafluoride SF6 circuit breakers are respectively connected with the head ends of the three dry-type hollow parallel reactors in series; the three dry-type hollow parallel reactors form a dry-type hollow parallel reactor group, the three dry-type hollow parallel reactors are named as an A-phase reactor, a B-phase reactor and a C-phase reactor respectively, the tail ends of the three dry-type hollow parallel reactors are connected to form a reactor neutral point, and the reactor neutral point is not grounded; the number of the capacitive voltage dividers is four, wherein three capacitive voltage dividers are respectively connected with the head ends of three dry-type hollow parallel reactors and used for acquiring the voltage of the high-voltage end of each phase reactor, the other capacitive voltage divider is connected with the neutral point of the reactor and used for acquiring the voltage of the neutral point of the reactor, the signal ends of the four capacitive voltage dividers are respectively connected with four acquisition terminals of the digital oscilloscope through four coaxial cables, a matching resistor is connected in series between each capacitive voltage divider and the coaxial cable corresponding to the capacitive voltage divider, and the resistance value of the matching resistor is the same as the impedance value of the coaxial cable; the UPS is used for providing power supply voltage for the digital oscilloscope.
Furthermore, the dry-type air-core parallel reactor adopts epoxy glass fiber as an insulating medium.
Further, the capacitive voltage divider is a capacitive voltage divider for surge voltage.
Furthermore, the grounding wires of the four capacitive voltage dividers are grounded in a single-point grounding mode.
Furthermore, the input end shielding layers of the four coaxial cables are all grounded, the output end shielding layers of the B same-axis cables are connected to the input ground of the digital oscilloscope through the shielding layers, the B same-axis cables are the coaxial cables connected to the branch of the B phase circuit, and the output end shielding layers of the other three coaxial cables are in potential suspension.
Through the above design scheme, the utility model discloses following beneficial effect can be brought: the utility model provides a SF6 circuit breaker switching dry-type air core reactor overvoltage test circuit, the measurement of switching overvoltage goes on through capacitive voltage divider cooperation digital oscilloscope's method, capacitive voltage divider turns into the low voltage signal that digital oscilloscope measures with high voltage signal, directly acquire each looks reactor high pressure end test point to ground voltage through three capacitive voltage dividers, a capacitive voltage divider directly acquires reactor neutral point voltage, each looks reactor high pressure end voltage does the difference operation with reactor neutral point voltage, acquire the voltage on each looks reactor. Switching overvoltage is transient voltage, in order to obtain the voltage, the digital oscilloscope adopts an A-phase reactor waveform rising slope edge triggering working mode, the triggering voltage of the digital oscilloscope is slightly higher than the steady-state working voltage of the dry-type hollow parallel reactor, the voltage waveform and the numerical value of each switching-in or switching-out are recorded, and a data file can be called through Excel software to further analyze data and make a waveform diagram.
Drawings
The accompanying drawings description herein is provided to provide a further understanding of the invention and constitute a part of the application of the invention, and the exemplary embodiments and descriptions thereof are used for understanding the invention and do not constitute undue limitations of the invention in the drawings:
fig. 1 is a schematic diagram of an overvoltage test circuit of an SF6 circuit breaker switching dry-type air-core reactor.
In the figure: 1-a three-phase line; 2-a circuit breaker; 3-dry type hollow parallel reactor group; 4-a capacitive voltage divider; 5-matching resistance; 6-coaxial cable; 7-digital oscilloscope; 8-UPS power supply; 9-a ground line; 10-shield connection.
Detailed Description
The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
As shown in fig. 1, the utility model provides a SF6 circuit breaker switching dry-type air core reactor overvoltage test circuit includes three-phase line 1, circuit breaker 2, the hollow parallelly connected reactor group of dry-type 3, capacitive voltage divider 4, matching resistance 5, coaxial cable 6, digital oscilloscope 7 and UPS power 8.
Three lines of the three-phase line 1 of the utility model are A, B, C three phases respectively; the circuit breaker 2 is a circuit breaker consisting of three sulfur hexafluoride SF6 circuit breakers, incoming terminals of the three sulfur hexafluoride SF6 circuit breakers are respectively connected to A, B, C three phases of the three-phase line 1, outgoing terminals of the three sulfur hexafluoride SF6 circuit breakers are respectively connected in series with the head ends of three dry-type hollow parallel reactors, the three dry-type hollow parallel reactors are respectively named as an A-phase reactor, a B-phase reactor and a C-phase reactor, the A-phase reactor, the B-phase reactor and the C-phase reactor form a dry-type hollow parallel reactor group 3, and the outgoing terminals of the three sulfur hexafluoride SF6 circuit breakers are respectively connected in series with the head ends of the three dry-type hollow parallel reactors and are used for switching in and out the dry-type hollow parallel reactor group 3; the tail ends of the three dry-type hollow parallel reactors are connected to form a reactor neutral point, and the dry-type hollow parallel reactors are dry-type hollow reactors adopting epoxy glass fiber as an insulating medium; the capacitive voltage divider 4 is a capacitive voltage divider for impulse voltage, the capacitive voltage divider 4 is used for converting a high-voltage signal into a low-voltage signal which can be measured by the digital oscilloscope 7, the capacitive voltage divider 4 comprises four capacitive voltage dividers 4, three capacitive voltage dividers 4 are respectively connected with the head ends of three dry-type hollow parallel reactors so as to obtain the high-voltage end voltage of each phase of reactor, the other capacitive voltage divider 4 is connected with a neutral point of the reactor so as to obtain the neutral point voltage of the reactor, the signal ends of the four capacitive voltage dividers 4 are respectively connected with four acquisition terminals of the digital oscilloscope 7 through four coaxial cables 6, a matching resistor 5 is connected in series between each capacitive voltage divider 4 and the corresponding coaxial cable 6, and the resistance value of the matching resistor 5 is the same as the impedance value of the coaxial cable 6; the digital oscilloscope 7 has the analog bandwidth of 200MHz and the sampling rate of 2Gs/s and is used for acquiring voltage signals and recording waves; the digital oscilloscope 7 is powered by an UPS (uninterrupted power supply) 8, is isolated from the ground and is in a suspension state; the magnetic circuit of the dry type hollow parallel reactor group 3 is open, the grounding wires 9 of the plurality of capacitive voltage dividers 4 are grounded by single points, no loop is formed, and the electromagnetic induction is prevented from forming a circulating current.
The process of the method for carrying out the SF6 breaker switching dry-type air-core reactor overvoltage field test based on the test circuit is as follows:
the overvoltage of the SF6 circuit breaker switching dry-type air reactor is measured by a method that a capacitive voltage divider 4 is matched with a digital oscilloscope 7, the neutral point of a dry-type air core parallel reactor group 3 consisting of an A-phase reactor, a B-phase reactor and a C-phase reactor is not grounded, and in order to obtain the voltage on each phase reactor, four capacitive voltage dividers 4 with the same model are installed on the high-voltage end of a A, B, C three-phase reactor of the dry-type air core parallel reactor group 3 and the neutral point of the reactor in a point-to-ground manner; and directly acquiring the voltage to the ground of the test point through each capacitive voltage divider 4, and performing difference operation on the voltage at the high-voltage end of each phase reactor and the voltage at the neutral point of the reactor to acquire the voltage on each phase reactor. In order to reduce the influence of the connecting bus and the leads on the measurement, the leads connecting the capacitive divider 4 are as close as possible to the reactors of the phases and as short as possible.
When the length of the coaxial cable 6 is greater than 1/30 of the wavelength of the propagating signal, it is no longer considered a lumped parameter, but is discussed by a distributed parameter. The propagation velocity of the wave in the coaxial cable 6 is about 200m/μ s, and the length of the coaxial cable 6 and the condition that the overvoltage signal satisfy the distribution parameters are shown in table 1.
TABLE 1 coaxial cable and over-voltage signal conditions for distribution parameters
If the frequency of the test overvoltage signal, i.e. the measured signal, is higher than the frequency condition given in table 1, the initial voltage division ratio k of the capacitive voltage divider 4 is0Comprises the following steps:
if the measured signal frequency is lower than the frequency given in Table 1Conditional, the coaxial cable 6 can be considered as the capacitance C between the core and the sheathCSteady-state voltage division ratio k of the capacitive voltage divider 4∞Comprises the following steps:
wherein C is1For saving capacitance, C, on the capacitive voltage divider 42For saving power capacity under the capacitive voltage divider 4, when the capacitive voltage divider 4 satisfies C2>>CCThe influence of the capacitance of the coaxial cable 6 is negligible, and the initial voltage division ratio k of the capacitive voltage divider 4 is negligible0Equal to the steady-state voltage division ratio k of the capacitive voltage divider 4∞. The voltage signal measured by the digital oscilloscope 7 is multiplied by the voltage division ratio to obtain a measured high-voltage signal.
At the measuring end, the four input signals of the digital oscilloscope 7 are connected in common to the ground, and a short circuit loop forming a ground circuit is also avoided. The input end shielding layers of the four coaxial cables 6 are all grounded, the output end shielding layers of the B same-axis cables are connected to the input ground of the digital oscilloscope 7 through the shielding layer wiring 10, the B same-axis cables are the coaxial cables 6 connected to the B phase circuit branch, and the output end shielding layers of the other three coaxial cables 6 are in potential suspension. In order to prevent the common mode interference influence caused by the grounding potentials at the two ends of the coaxial cable 6, the digital oscilloscope 7 is powered by the UPS 8, is isolated from the ground and is in a suspension state.
Connecting a test circuit according to a circuit structure of an SF6 circuit breaker switching dry-type air reactor overvoltage test circuit shown in figure 1, setting an X-axis time unit and a Y-axis voltage amplitude unit of a digital oscilloscope 7, and respectively receiving an A-phase reactor voltage signal, a B-phase reactor voltage signal, a C-phase reactor voltage signal and a reactor neutral point voltage signal by four test channels of the digital oscilloscope 7; the digital oscilloscope 7 adopts an A-phase reactor waveform rising slope edge triggering working mode, the triggering voltage of the digital oscilloscope 7 is set to be 1.1 times of the steady-state working voltage of the dry-type hollow parallel reactor, then the sulfur hexafluoride SF6 circuit breaker switching operation is carried out, the switching-in and switching-out overvoltage is transient voltage, and the digital oscilloscope 7 automatically records the voltage waveform of each switching-in or switching-out to complete the overvoltage test.
Claims (6)
- SF6 breaker switching dry-type air-core reactor overvoltage test circuit, its characterized in that, this test circuit includes: the device comprises a three-phase circuit (1), a circuit breaker (2), a dry type hollow parallel reactor group (3), a capacitive voltage divider (4), a matching resistor (5), a coaxial cable (6), a digital oscilloscope (7) and a UPS (uninterrupted power supply) power supply (8), wherein three circuits of the three-phase circuit (1) are A, B, C three phases respectively; the circuit breaker (2) is composed of three sulfur hexafluoride SF6 circuit breakers, incoming terminals of the three sulfur hexafluoride SF6 circuit breakers are respectively connected to A, B, C three phases of the three-phase line (1), and outgoing terminals of the three sulfur hexafluoride SF6 circuit breakers are respectively connected with the head ends of the three dry-type hollow parallel reactors in series; the three dry-type hollow parallel reactors form a dry-type hollow parallel reactor group (3), the three dry-type hollow parallel reactors are named as an A-phase reactor, a B-phase reactor and a C-phase reactor respectively, the tail ends of the three dry-type hollow parallel reactors are connected to form a reactor neutral point, and the reactor neutral point is not grounded; the number of the capacitive voltage dividers (4) is four, wherein three capacitive voltage dividers (4) are respectively connected with the head ends of three dry-type hollow parallel reactors and used for acquiring the voltage of the high-voltage end of each phase reactor, the other capacitive voltage divider (4) is connected with the neutral point of the reactor and used for acquiring the voltage of the neutral point of the reactor, the signal ends of the four capacitive voltage dividers (4) are respectively connected with four acquisition terminals of a digital oscilloscope (7) through four coaxial cables (6), a matching resistor (5) is connected between each capacitive voltage divider (4) and the coaxial cable (6) corresponding to the capacitive voltage divider in series, and the resistance value of the matching resistor (5) is the same as the impedance value of the coaxial cable (6); the UPS (8) is used for providing power supply voltage for the digital oscilloscope (7).
- 2. The SF6 circuit breaker switching dry air core reactor overvoltage test circuit of claim 1, wherein: the dry-type hollow parallel reactor adopts epoxy glass fiber as an insulating medium.
- 3. The SF6 circuit breaker switching dry air core reactor overvoltage test circuit of claim 1, wherein: the capacitive voltage divider (4) is used for surge voltage.
- 4. The SF6 circuit breaker switching dry air core reactor overvoltage test circuit of claim 1, wherein: and the grounding wires (9) of the four capacitive voltage dividers (4) are grounded in a single-point grounding mode.
- 5. The SF6 circuit breaker switching dry air core reactor overvoltage test circuit of claim 1, wherein: the input end shielding layers of the four coaxial cables (6) are all grounded, the output end shielding layers of the B same-axis cables are connected to the input ground of the digital oscilloscope (7) through the shielding layer wiring (10), the B same-axis cables are the coaxial cables (6) connected to the B phase circuit branch, and the output end shielding layer potentials of the other three coaxial cables (6) are suspended.
- 6. The SF6 circuit breaker switching dry air core reactor overvoltage test circuit of claim 1, wherein: the length of the coaxial cable (6) is less than or equal to 25 m.
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| CN202022648739.7U CN214097605U (en) | 2020-11-16 | 2020-11-16 | Overvoltage test circuit for SF6 circuit breaker switching dry-type air-core reactor |
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