CN204903656U - A device for arc suppressing coil ground system measuring circuit direct -to -ground capacitance - Google Patents

A device for arc suppressing coil ground system measuring circuit direct -to -ground capacitance Download PDF

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Publication number
CN204903656U
CN204903656U CN201520579745.8U CN201520579745U CN204903656U CN 204903656 U CN204903656 U CN 204903656U CN 201520579745 U CN201520579745 U CN 201520579745U CN 204903656 U CN204903656 U CN 204903656U
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China
Prior art keywords
plc
arc suppression
suppression coil
measuring circuit
cable
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CN201520579745.8U
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Inventor
沈伟伟
肖龙海
王伟
胡伟源
顾天天
潘国华
陈燕萍
朱小飞
李秋平
谢建强
田翠华
曾嘉亮
孙宝金
邹亮
张�杰
王朋
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Wuhan Hai Ao Electric Applicance Co Ltd
Tongxiang Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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Wuhan Hai Ao Electric Applicance Co Ltd
Tongxiang Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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Abstract

The utility model relates to a device of measuring circuit direct -to -ground capacitance among the arc suppressing coil ground system, it includes: arc extinction coil body, arc extinction coil body's A termination to electric wire netting neutral point, X termination ground, a inlet wire termination have current transformer, and it has the voltage transformer of injection into and detect voltage transformer to connect in parallel in A, X both ends, the control panel cabinet includes PLC, PLC is connected with the converter, version, FPGA board are followed to the signal, and the magnetic control case, respectively with arc extinction coil body and control panel cabinet are connected, through the pulse that PLC control was sent, advance menstruation to the pulse and cross corresponding plastic, trigger the break -make of thyristor, realize the reactance control to the arc suppressing coil. The utility model discloses can be accurate, quick be used for arc suppressing coil ground system measuring circuit direct -to -ground capacitance, can be when electric wire netting normal operating automatic measure capacitance current to in compensating fast earth current when certain feeder takes place phase to earth fault.

Description

For the device of arc suppression coil earthing system measuring circuit ground capacitance
Technical field
The utility model relates to the measurement of ground capacitance, particularly a kind of device for arc suppression coil earthing system measuring circuit ground capacitance.
Background technology
Electric connecting mode between neutral point in electric power system and the earth, is called Neutral Grounding Modes of Power System.China's electric system, according to main operation characteristic, is divided into two large classes: small current neutral grounding system (non-effective earthing) and heavy current grounding system (effective grounding) by corresponding earthed system.In distribution system, extensively adopt small current neutral grounding mode, mainly contain three kinds: 1. isolated neutral mode; 2. neutral by arc extinction coil grounding mode; 3. neutral point is through high grounding.
At present, the Contact patch of the medium voltage distribution network of China mainly small current neutral grounding system (i.e. neutral by arc extinction coil grounding).When system long-time running, singlephase earth fault is modal fault in middle voltage distribution networks system, after there is ground connection, small current neutral grounding system also can continue to operate with failure, because healthy phases voltage-to-ground raises 1.732 times, if process not in time, after long-time running, may develop into the threat of healthy phases insulation breakdown secondary phase fault, therefore, ground path when determining rapidly single-phase earthing is of great significance to for the safe operation of joining dot system.
Real system is before carrying out single-phase grounding selecting, need to measure capacitance current accurately, because the size of capacitance current is relevant with system line, and the measurement of capacitance current is relevant with the impact of neutral point voltage (referring to the neutral point displacement voltage under normal operation here), therefore, carry out accurate capacitance measurement, tool acquires a certain degree of difficulty, simultaneously, measuring system capacitance current is also whether determine resonant earthed system installing arc suppression coil, and select the important evidence of arc suppression coil capacity, simultaneously, also be under single-phase fault, the prerequisite condition that quick input arc suppression coil runs.
Summary of the invention
The utility model object is overcome above-mentioned the deficiencies in the prior art and provide a kind of device for measuring circuit ground capacitance in arc suppression coil earthing system, and this device can accurately and rapidly for arc suppression coil earthing system measuring circuit ground capacitance.
The technical scheme realizing the employing of the utility model object is a kind of device for measuring circuit ground capacitance in arc suppression coil earthing system, and it comprises:
Arc suppression coil body, the A end of described arc suppression coil body receives neutral point of electric network, and X holds ground connection, and A end of incoming cables is connected to current transformer, and A, X two ends are parallel with injecting voltage mutual inductor and detect voltage transformer (VT);
Control flow cabinet comprises PLC, and described PLC is connected with frequency converter, signal follows version, FPGA plate; And
Magnetic control case, is provided with thyristor in it; Described magnetic control case is connected with described arc suppression coil body and control flow cabinet respectively, and controlled the pulse sent by PLC, paired pulses carries out through corresponding shaping, triggers the break-make of thyristor, realizes controlling the reactance of arc suppression coil.
In technique scheme, described PLC is Siemens S-700PLC, and frequency converter is Siemens MICROMASTER420 General Converters.
In technique scheme, described frequency converter is connected with the PORT0 mouth of PLC by RS485 cable.
In technique scheme, the analog output mouth of described FPGA plate is connected with PLC analog quantity input A, B by cable, analog quantity input is connected with PLC analog output mouth V by 1.0 cables, digital output mouth is connected with PLC digital quantity input port I0.1 by cable, and digital quantity input port is connected with PLC digital output mouth Q0.2, Q0.6 by cable.
In technique scheme, the digital output mouth that described signal follows version is connected by cable with PLC digital quantity input port I0.0, and digital quantity input port is connected by cable with PLC digital output mouth Q0.3, Q0.4, Q0.5.
The utility model can accurately and rapidly for arc suppression coil earthing system measuring circuit ground capacitance, automatically capacitance current can be measured, so that can compensate fast ground current when certain feeder line generation singlephase earth fault when electrical network normally runs.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the utility model for the device of measuring circuit ground capacitance in arc suppression coil earthing system.
Fig. 2 is the annexation schematic diagram of embodiment PLC and FPGA plate used.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
The utility model is used for the device of measuring circuit ground capacitance in arc suppression coil earthing system, comprises arc suppression coil body, control flow cabinet and magnetic control case, wherein,
Between the neutral point that arc suppression coil body is installed on three-phase distribution and ground, if distribution is wye connection, then need to draw neutral point by grounding transformer, the A end of arc suppression coil body receives neutral point of electric network, X holds ground connection, A end of incoming cables is connected to Current Transmit 2, A, X two ends are parallel with injecting voltage mutual inductor PT1 and detect voltage transformer pt 2.
Control flow cabinet is system master unit, and comprise frequency variation signal and inject, signal acquisition process, breakdown judge, the parts such as pulse transmission, control flow cabinet comprises PLC, and PLC is connected with frequency converter, signal follows version, FPGA plate.The present embodiment described PLC used is Siemens S-700PLC, frequency converter is Siemens MICROMASTER420 General Converters, the analog output mouth of FPGA plate is connected with PLC analog quantity input A, B by cable, analog quantity input is connected with PLC analog output mouth V by 1.0 cables, digital output mouth is connected with PLC digital quantity input port I0.1 by cable, and digital quantity input port is connected with PLC digital output mouth Q0.2, Q0.6 by cable.The digital output mouth that signal follows version is connected by cable with PLC digital quantity input port I0.0, and digital quantity input port is connected by cable with PLC digital output mouth Q0.3, Q0.4, Q0.5.Annexation between PLC and FPGA plate as shown in Figure 2.PLC is as key control unit, and Main Function is control frequency converter, produces MCR pulse signal, realizes the functions such as the measurement of the capacitance current based on frequency sweep method.Frequency converter adopts V/F Linear Control, utilizes USS agreement and PLC to carry out communicating and produce controlled frequency conversion voltage signal.FPGA plate is mainly used in the acquisition and processing of signal, and the signal of collection mainly contains neutral point voltage, the useful frequency variation signal of offsetting through power frequency and MCR electric current.Described frequency converter is connected with the PORT0 mouth of PLC by RS485 cable.
Magnetic control case is connected with described arc suppression coil body and control flow cabinet respectively, controlled the pulse sent by PLC, paired pulses carries out through corresponding shaping, triggers the break-make of thyristor, realize controlling the reactance of arc suppression coil, make reactor outputting inductance current compensation capacitance current in case of a fault.
For measuring system, the capacitance voltage in power frequency situation is a undesired signal, therefore, in measuring system, need to process capacitance voltage signal, core is exactly filtering power frequency, and ensures the capacitance voltage signal in measuring-signal under the required frequency of an existence as far as possible.
As shown in Figure 2, because the input signal of signal processing is less, only need neutral point voltage and reactor current, inverter current, use FPGA plate at a high speed to carry out corresponding calculating, solve the operational problem of PLC.
When electrical network is in normal operating condition, control system is in frequency sweep state, PLC is by USS protocol integrated test system frequency converter, make the interval change from 10HZ to 45HZ of frequency converter voltage output frequency, the constant current signal linear signal that frequency conversion voltage injects constant amplitude toward arc suppression coil input and output two ends after PT1 boosting, frequency changes within the specific limits.Have measuring voltage mutual inductor PT2 at arc suppression coil opposite side, this PT measures capacitance voltage, and PT2 secondary side connection signal follows plate, is linked into the AIW0 mouth of PLC after the process of FPGA plate.When frequency sweep due to system in there is sweep voltage and the 50HZ power-frequency voltage of low frequency simultaneously, therefore filtering low-frequency voltage is needed when measuring actual capacitance voltage, the resonance potential of collection is oppositely outputted to FPGA by the AQW0 mouth especially by PLC, removes resonance potential obtain power-frequency voltage in FPGA plate by cancellation circuit.When the AIW0 mouth of PLC detects that capacitance voltage is maximum, now arc suppression coil inductance and line mutual-ground capacitor generation resonance, PLC writes down now frequency.The ground capacitance value of circuit is obtained by known arc suppression coil inductance value and capacitance voltage, frequency computation part.

Claims (5)

1., for a device for measuring circuit ground capacitance in arc suppression coil earthing system, it is characterized in that, comprising:
Arc suppression coil body, the A end of described arc suppression coil body receives neutral point of electric network, and X holds ground connection, and A end of incoming cables is connected to current transformer, and A, X two ends are parallel with injecting voltage mutual inductor and detect voltage transformer (VT);
Control flow cabinet comprises PLC, and described PLC is connected with frequency converter, signal follows version, FPGA plate; And
Magnetic control case, is provided with thyristor in it; Described magnetic control case is connected with described arc suppression coil body and control flow cabinet respectively, and controlled the pulse sent by PLC, paired pulses carries out through corresponding shaping, triggers the break-make of thyristor, realizes controlling the reactance of arc suppression coil.
2. according to claim 1 for the device of measuring circuit ground capacitance in arc suppression coil earthing system, it is characterized in that: described PLC is Siemens S-700PLC, frequency converter is Siemens MICROMASTER420 General Converters.
3. according to claim 2 for the device of measuring circuit ground capacitance in arc suppression coil earthing system, it is characterized in that: described frequency converter is connected with the PORT0 mouth of PLC by RS485 cable.
4. according to claim 2 for the device of measuring circuit ground capacitance in arc suppression coil earthing system, it is characterized in that: the analog output mouth of described FPGA plate is connected with PLC analog quantity input A, B by cable, analog quantity input is connected with PLC analog output mouth V by 1.0 cables, digital output mouth is connected with PLC digital quantity input port I0.1 by cable, and digital quantity input port is connected with PLC digital output mouth Q0.2, Q0.6 by cable.
5. according to claim 2 for the device of measuring circuit ground capacitance in arc suppression coil earthing system, it is characterized in that: the digital output mouth that described signal follows version is connected by cable with PLC digital quantity input port I0.0, digital quantity input port is connected by cable with PLC digital output mouth Q0.3, Q0.4, Q0.5.
CN201520579745.8U 2015-08-04 2015-08-04 A device for arc suppressing coil ground system measuring circuit direct -to -ground capacitance Active CN204903656U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108896892A (en) * 2018-08-30 2018-11-27 北京中联太信科技有限公司 TXLR type effectively earthed system direct current decoupling device
CN109256762A (en) * 2017-07-13 2019-01-22 许继集团有限公司 Power distribution network single-phase fault current compensation control method, device and system
CN112165077A (en) * 2020-10-29 2021-01-01 国网北京市电力公司 Grounding device of microgrid, control method thereof, control device and grounding system
CN113358912A (en) * 2021-06-11 2021-09-07 南方电网数字电网研究院有限公司 Voltage measuring device, voltage measuring method, and storage medium

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109256762A (en) * 2017-07-13 2019-01-22 许继集团有限公司 Power distribution network single-phase fault current compensation control method, device and system
CN108896892A (en) * 2018-08-30 2018-11-27 北京中联太信科技有限公司 TXLR type effectively earthed system direct current decoupling device
CN112165077A (en) * 2020-10-29 2021-01-01 国网北京市电力公司 Grounding device of microgrid, control method thereof, control device and grounding system
CN113358912A (en) * 2021-06-11 2021-09-07 南方电网数字电网研究院有限公司 Voltage measuring device, voltage measuring method, and storage medium
CN113358912B (en) * 2021-06-11 2022-03-08 南方电网数字电网研究院有限公司 Voltage measuring device, voltage measuring method, and storage medium
US11703529B2 (en) 2021-06-11 2023-07-18 Digital Grid Research Institute, China So Po Grid Voltage measurement device, voltage measurement method, and storage medium

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