CN112327154A - Measuring device, measuring system and measuring method for direct current change-over switch of converter station - Google Patents
Measuring device, measuring system and measuring method for direct current change-over switch of converter station Download PDFInfo
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- CN112327154A CN112327154A CN202011236398.0A CN202011236398A CN112327154A CN 112327154 A CN112327154 A CN 112327154A CN 202011236398 A CN202011236398 A CN 202011236398A CN 112327154 A CN112327154 A CN 112327154A
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000005684 electric field Effects 0.000 claims abstract description 42
- 238000005070 sampling Methods 0.000 claims description 23
- 238000006243 chemical reaction Methods 0.000 claims description 21
- 238000012546 transfer Methods 0.000 claims description 9
- 230000001360 synchronised effect Effects 0.000 claims description 7
- 230000006698 induction Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/12—Measuring electrostatic fields or voltage-potential
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Abstract
The invention relates to a measuring device of a converter station direct current change-over switch, a measuring system and a measuring method thereof. The device can test the oscillating circuit of the direct current breaker of the ultrahigh voltage and ultrahigh voltage converter station and the electric field and current of the arrester, and can realize detailed monitoring of the state of the direct current change-over switch during metal-ground mutual change-over.
Description
Technical Field
The invention belongs to the technical field of electronics, and particularly relates to a device, a system and a method for measuring an electric field and current of a direct-current transfer switch of an ultrahigh-voltage and extra-high-voltage converter station.
Background
The direct current change-over switch is key equipment of a direct current field of an ultrahigh voltage and extra-high voltage direct current project and is mainly used for changing over various operation modes of a direct current transmission system. Since the switching off of a direct current does not make use of zero crossings of an alternating current as with an alternating current, the switching off of a direct current has to force a zero crossing. However, when the direct current is forced to pass zero, the direct current system stores huge energy to be released, and the released energy generates an over-field on a loop, so that the reignition of the arc between the fractures of the circuit breaker is caused, and the failure of the circuit breaker is caused.
The breaking of the direct current breaker can be divided into three stages
1) Forced current zero crossing phase. The commutation loop should produce at least one zero crossing of the current.
2) In the medium recovery phase, the circuit breaker is required to have a fast arc extinguishing medium recovery speed which is higher than the rising speed of the recovery electric field between the arc extinguishing contacts. And when the recovery electric field reaches the continuous maximum operation electric field of the lightning arrester, the lightning arrester is conducted.
3) In the energy absorption stage, the discharge load capacity of the arrester of the energy consumption device is required to be larger than the residual energy in the direct current system, and the requirement of at least secondary arc extinction energy consumption is considered.
At present, no device capable of monitoring the voltage and the current of the direct current change-over switch simultaneously exists in the conversion process, and how to develop a voltage and current measuring method and a device thereof for comprehensively and accurately mastering the characteristic changes of an LC oscillating circuit and an arrester becomes a problem to be solved urgently. At present, a large-sized high-voltage divider resistor is commonly used for measuring high-voltage, but a miniature measuring device cannot measure the voltage in a high-voltage divider resistor mode. The monitoring device calculates the corresponding voltage change through electric field measurement.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a measuring device, a measuring system and a measuring method for a converter station direct-current change-over switch.
In order to achieve the purpose, the invention adopts the following technical scheme:
a measuring device for a direct current change-over switch of a converter station,
comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the current measuring unit is used for sampling the current of the LC oscillating circuit of the direct current switch and the line at the top end of the lightning arrester;
the electric field measuring unit is used for sampling electric fields of the LC oscillating circuit of the direct current switch and a line at the top end of the lightning arrester;
the voltage-controlled oscillator is used for outputting an accurate clock signal and also used for accurate synchronous sampling, a control end of the voltage-controlled oscillator is connected with a controlled end of the electric field measuring unit, the control of the voltage-controlled oscillator is also connected with a controlled end of the current measuring unit, and an output end of the voltage-controlled oscillator is connected with an input end of the frequency calculating and controlling unit;
the high-precision reference clock is used for outputting a precise reference clock signal, and the output end of the high-precision reference clock is connected with the input end of the frequency calculation and control unit;
and the frequency calculation and control unit is used for comparing frequency signals input by the voltage-controlled oscillator and the high-precision reference clock, calculating a frequency error, outputting a control signal to adjust the frequency of the voltage-controlled oscillator, and connecting a control end of the frequency calculation and control unit with a controlled end of the voltage-controlled oscillator.
Preferably, the current measuring unit includes a rogowski coil with high precision, a first digital-to-analog converting unit, and a processor, an output end of the rogowski coil is connected to an input end of the first digital-to-analog converting unit, and an output end of the first digital-to-analog converting unit is connected to an input end of the processor.
Preferably, the electric field measuring unit includes an electric field sensing polar plate, a second digital-to-analog converting unit of the amplifying unit, and a processor, an output end of the electric field sensing polar plate is connected to an input end of the amplifying unit, an output end of the amplifying unit is connected to an input end of the second digital-to-analog converting unit, and an output end of the second digital-to-analog converting unit is connected to an input end of the processor.
Preferably, in the measuring apparatus for a converter station dc transfer switch, the high-precision reference clock is a reference clock source outputting a high stable 10 MHz.
A measuring system comprises an LC oscillating circuit, lightning arresters and a plurality of measuring devices, wherein the LC oscillating circuit is connected with the lightning arresters in parallel, and the measuring devices are installed at the wire inlet positions of each LC oscillating circuit and each lightning arrester.
A measuring method of a measuring device of a converter station direct current transfer switch comprises the following steps:
step 1: sampling the current signal of each acquisition point;
step 2: sampling the electric field signal of each acquisition point;
and step 3: the frequency calculation and control unit calculates frequency signals input by the voltage-controlled oscillator and the high-precision reference clock to obtain frequency deviation, outputs control signals to the voltage-controlled oscillator, and enables the frequency error of the voltage-controlled oscillator and the high-precision reference clock to be smaller than a target position through multiple times of adjustment so as to achieve synchronous sampling of multi-point sampling data;
and 4, step 4: the collected current signal passes through the digital-to-analog conversion module and is compared with the internal calibration value to be displayed as a corresponding current value;
and 5: the collected electric field signal is compared with an internal calibration value after passing through a digital-to-analog conversion module and displayed as a corresponding voltage value.
By the scheme, the invention at least has the following advantages:
1) the invention realizes high-precision sampling of the LC oscillating circuit in the change-over switch, the electric field of the parallel arrester and the flowing current by utilizing the current measuring unit and the electric field measuring unit.
2) According to the invention, through the frequency calculation and control unit, the frequency error calculation of the voltage-controlled oscillator and the high-precision reference clock is realized, the voltage-controlled oscillator is controlled to output high-precision frequency, the electric field and current of the measuring device arranged at each position are ensured to be accurately and synchronously measured, and the voltage and current characteristics of the LC oscillating circuit and the lightning arrester in the conversion process are accurately analyzed based on the data.
3) The invention carries out accurate synchronous measurement on the voltage and the current in the conversion process, grasps the characteristics of the direct current change-over switch of the converter station and gives reference to the operation and maintenance of the direct current change-over switch of the converter station.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is an internal structural view of a measuring apparatus of the present invention;
FIG. 2 is a schematic view of current measurement in the measuring device of the present invention;
FIG. 3 is a schematic view of the measurement of the electric field in the measuring device of the present invention;
fig. 4 is a schematic view of the installation of the measuring device of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Examples
As shown in fig. 1, a measuring device for a dc transfer switch of a converter station,
comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the current measuring unit 101 is used for sampling the current of the LC oscillating circuit of the direct current change-over switch and the line at the top end of the lightning arrester;
the electric field measuring unit 102 is used for sampling electric fields of the LC oscillating circuit of the direct current switch and a top line of the lightning arrester;
the voltage-controlled oscillator 103 is used for outputting an accurate clock signal and also used for accurate synchronous sampling, a control end of the voltage-controlled oscillator 103 is connected with a controlled end of the electric field measuring unit 102, the control of the voltage-controlled oscillator 103 is also connected with a controlled end of the current measuring unit 101, and an output end of the voltage-controlled oscillator 103 is connected with an input end of the frequency calculating and controlling unit 105;
the high-precision reference clock 104 is used for outputting a precise reference clock signal, and the output end of the high-precision reference clock 104 is connected with the input end of the frequency calculation and control unit 105;
and the frequency calculation and control unit 105 is used for comparing frequency signals input by the voltage-controlled oscillator 103 and the high-precision reference clock 104, calculating a frequency error, and outputting a control signal to adjust the frequency of the voltage-controlled oscillator 103, wherein a control end of the frequency calculation and control unit 105 is connected with a controlled end of the voltage-controlled oscillator 103.
In the above scheme, the synchronization part includes a high-precision reference clock module 103, a voltage-controlled oscillator 104 and a frequency calculation and control unit 105, the frequency calculation and control unit 105 compares the frequency information of the high-precision reference clock module 103 with the high-frequency clock 104 of the local voltage-controlled oscillator to output a comparison frequency deviation to adjust the voltage-controlled oscillator, and the frequency error between the two is converged within a predetermined range through multiple adjustments, thereby realizing accurate synchronization of data sampling.
It should be noted that the 10Mhz clock signal output by the high-precision reference clock module 103 has an automatic temperature compensation function.
As shown in fig. 2, the current measuring unit 101 of the present invention includes a rogowski coil 1 with high precision, a first digital-to-analog converting unit 2, and a processor 3, wherein an output end of the rogowski coil 1 is connected to an input end of the first digital-to-analog converting unit 2, and an output end of the first digital-to-analog converting unit 2 is connected to an input end of the processor 3.
The Rogowski coil is also called a current measuring coil and a differential current sensor, and is an annular coil uniformly wound on a non-ferromagnetic material. The output signal is the differential of the current to the time, and the input current can be really restored. The Rogowski coil can measure currents ranging from a few amperes to hundreds of kiloamperes, has a simple structure, is not directly in circuit connection with the measured currents, and has a response frequency bandwidth of 0.1Hz-1 MHz.
For the use of the current measuring unit of the measuring device of the invention, the current measuring unit comprises a Rogowski coil, a digital-to-analog conversion circuit and a processor. The digital-to-analog conversion circuit and the processor convert the sampled current signal into a real current signal.
As shown in fig. 3, the electric field measuring unit 102 in the present invention includes an electric field sensing polar plate 4, an amplifying unit 5, a second digital-to-analog converting unit 6, and a processor 3, wherein an output end of the electric field sensing polar plate 4 is connected to an input end of the amplifying unit 5, an output end of the amplifying unit 5 is connected to an input end of the second digital-to-analog converting unit 6, and an output end of the second digital-to-analog converting unit 6 is connected to an input end of the processor 3.
The electric field induction polar plate outputs the data of the electric field change through the induction of the electric field change at the moment of conversion, and the data are converted into corresponding voltage values through an internal calibration table. And acquiring the trend of the change of the conversion instant voltage.
The measuring device of the invention uses an electric field measuring unit which comprises an electric field measuring polar plate, an operational amplifier, a digital-to-analog conversion circuit and a processor. The electric field plates are used for inducing the value of the electric field. The digital-to-analog conversion circuit and the processor convert the electric field signal into a corresponding voltage signal.
As shown in fig. 4, for the installation of the actual measuring device, the device comprises an LC oscillating circuit 7 and an arrester 8, and further comprises a plurality of measuring devices 9, wherein the LC oscillating circuit 7 is connected in parallel with the arrester 8, and a measuring device 9 is installed at the wire inlet of each LC oscillating circuit 7 and each arrester 8.
A measuring method of a measuring device of a converter station direct current transfer switch comprises the following steps:
step 1: sampling the current signal of each acquisition point;
step 2: sampling the electric field signal of each acquisition point;
and step 3: the frequency calculation and control unit 105 calculates frequency signals input by the voltage-controlled oscillator 103 and the high-precision reference clock 104 to obtain frequency deviation, outputs a control signal to the voltage-controlled oscillator 103, and makes the frequency error of the voltage-controlled oscillator 103 and the high-precision reference clock 104 smaller than a target position through multiple adjustments, so as to achieve multipoint sampling data synchronous sampling;
and 4, step 4: the collected current signal passes through the digital-to-analog conversion module and is compared with the internal calibration value to be displayed as a corresponding current value;
and 5: the collected electric field signal is compared with an internal calibration value after passing through a digital-to-analog conversion module and displayed as a corresponding voltage value.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A measuring device of a converter station direct current change-over switch is characterized in that:
comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the current measuring unit (101) is used for sampling the current of the LC oscillating circuit of the direct current change-over switch and the line at the top end of the lightning arrester;
the electric field measuring unit (102) is used for sampling electric fields of the LC oscillating circuit of the direct current switch and a top line of the lightning arrester;
the voltage-controlled oscillator (103) is used for outputting an accurate clock signal and also used for accurate synchronous sampling, a control end of the voltage-controlled oscillator (103) is connected with a controlled end of the electric field measuring unit (102), the voltage-controlled oscillator (103) is also controlled to be connected with a controlled end of the current measuring unit (101), and an output end of the voltage-controlled oscillator (103) is connected with an input end of the frequency calculating and controlling unit (105);
the high-precision reference clock (104) is used for outputting a precise reference clock signal, and the output end of the high-precision reference clock (104) is connected with the input end of the frequency calculation and control unit (105);
and the frequency calculation and control unit (105) is used for comparing frequency signals input by the voltage-controlled oscillator (103) and the high-precision reference clock (104), calculating a frequency error, and outputting a control signal to adjust the frequency of the voltage-controlled oscillator (103), wherein the control end of the frequency calculation and control unit (105) is connected with the controlled end of the voltage-controlled oscillator (103).
2. A measuring arrangement of a converter station dc transfer switch according to claim 1, characterized in that: the current measuring unit (101) comprises a Rogowski coil (1) with high precision, a first digital-to-analog conversion unit (2) and a processor (3), the output end of the Rogowski coil (1) is connected with the input end of the first digital-to-analog conversion unit (2), and the output end of the first digital-to-analog conversion unit (2) is connected with the input end of the processor (3).
3. A measuring arrangement of a converter station dc transfer switch according to claim 1, characterized in that: the electric field measuring unit (102) comprises an electric field induction polar plate (4), an amplifying unit (5), a second digital-to-analog conversion unit (6) and a processor (3), wherein the output end of the electric field induction polar plate (4) is connected with the input end of the amplifying unit (5), the output end of the amplifying unit (5) is connected with the input end of the second digital-to-analog conversion unit (6), and the output end of the second digital-to-analog conversion unit (6) is connected with the input end of the processor (3).
4. A measuring arrangement of a converter station dc transfer switch according to claim 1, characterized in that: the high-precision reference clock (103) is a reference clock source which outputs high-stability 10 MHz.
5. A measuring system according to claims 1 to 4, characterized in that: the lightning arrester comprises an LC oscillating circuit (7), lightning arresters (8) and a plurality of measuring devices (9), wherein the LC oscillating circuit (7) is connected with the lightning arresters (8) in parallel, and one measuring device (9) is installed at the wire inlet of each LC oscillating circuit (7) and each lightning arrester (8).
6. A measuring method of a measuring device of a converter station direct current transfer switch is characterized by comprising the following steps:
step 1: sampling the current signal of each acquisition point;
step 2: sampling the electric field signal of each acquisition point;
and step 3: the frequency calculation and control unit (105) calculates frequency signals input by the voltage-controlled oscillator (103) and the high-precision reference clock (104) to obtain frequency deviation, outputs control signals to the voltage-controlled oscillator (103), and enables the frequency error of the voltage-controlled oscillator (103) and the high-precision reference clock (104) to be smaller than a target position through multiple times of adjustment, so that multipoint sampling data synchronous sampling is achieved;
and 4, step 4: the collected current signal passes through the digital-to-analog conversion module and is compared with the internal calibration value to be displayed as a corresponding current value;
and 5: the collected electric field signal is compared with an internal calibration value after passing through a digital-to-analog conversion module and displayed as a corresponding voltage value.
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| CN202011236398.0A CN112327154A (en) | 2020-11-09 | 2020-11-09 | Measuring device, measuring system and measuring method for direct current change-over switch of converter station |
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| CN202011236398.0A CN112327154A (en) | 2020-11-09 | 2020-11-09 | Measuring device, measuring system and measuring method for direct current change-over switch of converter station |
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| CN109193739A (en) * | 2018-10-08 | 2019-01-11 | 南方电网科学研究院有限责任公司 | A kind of direct current conversion switch circuit and DC transmission system based on converter station |
| CN209086346U (en) * | 2018-10-23 | 2019-07-09 | 国网四川省电力公司检修公司 | A kind of converter station metallic return change-over switch lightning arrester connected in parallel monitoring device |
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- 2020-11-09 CN CN202011236398.0A patent/CN112327154A/en active Pending
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| CN102230948A (en) * | 2011-03-17 | 2011-11-02 | 湖北省电力公司电力试验研究院 | Active high voltage direct current switch oscillation loop parameter on-line measuring system and method thereof |
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