CN205280861U - Alternating -current system grounding detection appearance - Google Patents
Alternating -current system grounding detection appearance Download PDFInfo
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- CN205280861U CN205280861U CN201521004548.XU CN201521004548U CN205280861U CN 205280861 U CN205280861 U CN 205280861U CN 201521004548 U CN201521004548 U CN 201521004548U CN 205280861 U CN205280861 U CN 205280861U
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Abstract
The utility model discloses an alternating -current system grounding detection appearance, including a host computer, a plurality of branch road detection module and sensor triplex of forming a complete set with it. The host computer includes bus insulation detection module, main processor module, display module, alarm module, low -frequency signal module and level conversion module, the sensor connects respectively on every way of ac bus, bus insulation detection module includes with main processor module's sample voltage input ports are connected's adc, is connected at the potentiometre between adc and the generating line, is connected direct voltage source and the branch road of feeding the buffer circuit place between digital analog converter and generating line. The utility model discloses can solve alternating -current system grounding detection appearance's branch road route selection function, anti great distributed capacitance of improvement and the ability that inductive circuit disturbed improve technical problem such as measuring precision and sensitivity.
Description
Technical field
The utility model relates to the electric power checkout facility of power station and substation.
Background technology
Exchange system insulation fault is generating and the common fault in power system, it is necessary to the moment monitors, processes in time, not so can badly influence the safe operation of power system. Along with the development of China's economy and the progress of science, the demand of electric power is increasing, requiring more and more higher to quality of power supply, middle-size and small-size power station and medium and small capacity substation can not meet demand under the new situation, urgently need to build large-scale nuclear power plant and Large Copacity substation. In the last few years, China was newly-built successively many large-scale power station and Large Copacity substation. The electric power facility more complicated of these power station and substation, the degree of automatization is also higher; Networking region is extensive, outside exchange main screen, also has some exchange point screens, and loop main, point screen control is more, and some stations branch road sum can reach several hundred multichannels; Range of distribution is relatively wide, and the interval between master, point screen reaches one kilometer. The increase of operating device amount and increasing of control circuit, will inevitably increase the interference of electromagnetic field and the interference to ground distributed capacity. Exchange system earth detector is proposed new challenge and higher requirement by this: require to exchange the function that system earth detector increases each branch path of detection, improve detection speed and accuracy of detection, and improve electromagnetism interference and the ability to the interference of ground distributed capacity. The exchange system earth detector that power equipment producer produces both at home and abroad at present, can only monitor exchange system bus insulation situation, it does not have branch road route selection function. Once insulating fault occurs in exchange system, ground connection branch road can not be locked within the short period of time, can only artificially investigate one by one. For meeting the requirement in newly-built large-scale power station and Large Copacity substation, urgently need research and development to go out a kind of novel exchange system insulation monitor, meet the demand of China's electric power development, it is ensured that power system security runs reliably.
Summary of the invention
The purpose of this utility model is to provide a kind of exchange system earth detector, to solve the branch road route selection function of exchange system earth detector, it is to increase the ability of anti-bigger distributed capacity and electromagnetic interference, it is to increase the technical problems such as the precision of measurement and sensitivity.
In order to realize foregoing invention object, the technical scheme that the utility model adopts is as follows:
Exchange system earth detector, comprises a main frame, multiple branch road detection module supporting with it and sensor three part; Described main frame comprises bus insulation detection module, main processor modules, display module, alarm module, ultra-low frequency signal module and level conversion module; The sampled voltage input port of bus insulation detection module and main processor modules is connected, display module and alarm module respectively display output port and alarm signal output ends mouth with main processor modules be connected; The steering order signal end of the serial communication port of main processor modules is connected with ultra-low frequency signal source, and this ultra-low frequency signal source synchronizing signal output port is connected with multiple branch road detection module respectively, and sinusoidal wave signal output terminal is connected with ac bus; The transmission and reception instruction signal end of the serial communication port of main processor modules is connected with multiple branch road detection module respectively by the first electrical level transferring chip; Described branch insulation detection module comprises the analog selection switch, signal amplifier, prime wave filter, phase ocmparator, rear class wave filter, analog to digital converter, coprocessor and the second electrical level conversion chip that connect successively; Analog selection switch is connected with sensor, and phase ocmparator is connected with ultra-low frequency signal source, and second electrical level conversion chip is connected with the first electrical level transferring chip; Described sensor is connected on each branch road of ac bus respectively; Described bus insulation detection module comprises the branch road at analog to digital converter, the potentiometer being connected between analog to digital converter and bus, the volts DS source being connected between digital to analog converter and bus and feeding isolation circuit place that the input port of the sampled voltage with main processor modules is connected.
Ultra-low frequency signal module forms primarily of Signal Generator of Ultra-low Frequency, the synchronous signal output end of Signal Generator of Ultra-low Frequency is connected with multiple branch road detection module, and the square wave signal output port of Signal Generator of Ultra-low Frequency is connected with bus by digital to analog converter, power amplifier and feeding shield retaining.
The serial communication port of main processor modules is connected with upper computer.
Main processor modules adopts 8051 micro-chip STC12C5A60S2.
Branch insulation detection module adopt center band be the bandpass filtering circuit of 2Hz.
Advantage of the present utility model is as follows: the utility model not only can monitor bus insulation situation, and the insulation status for branch bar also can be monitored. This detector adopts the detection mode of feedback signal to monitor the insulation status of each branch bar, once the insulation decline of certain branch bar, detector can at several minutes inner position insulating fault branch bar. The utility model signal generator produces the square wave signal of 2Hz while producing the positive string signal of 2Hz ultralow frequency, be transported to each signal acquisition module by main frame, eliminate the impact of asynchronous induction signal. In circuit layout, the utility model adopts center band to be that the bandpass filtering circuit of 2Hz filters various harmonic wave, ensures that the signal extracted is the pure positive string signal of 2Hz low frequency.
Accompanying drawing explanation
Fig. 1 is practical novel schematic block circuit diagram.
Fig. 2 is embodiment schematic circuit diagram of the present utility model.
Fig. 3 is the schematic circuit diagram of Signal Generator of Ultra-low Frequency of the present utility model.
Fig. 4 is the schematic circuit diagram of bus insulation detection module of the present utility model.
Embodiment
Shown in Figure 1, this detector is modularization distributed structure, is made up of a main frame, multiple branch road detection module supporting with it and sensor three part.
Host work principle:
Host module comprises bus insulation detection module, main processor modules, display module, alarm module, ultra-low frequency signal module and level conversion module; The sampled voltage input port of bus insulation detection module and main processor modules is connected, display module and alarm module respectively display output port and alarm signal output ends mouth with main processor modules be connected; The steering order signal end of the serial communication port of main processor modules is connected with ultra-low frequency signal source, and this ultra-low frequency signal source synchronizing signal output port is connected with multiple branch road detection module respectively, and square wave signal output terminal is connected with ac bus; The transmission of the serial communication port of main processor modules is accepted instruction signal end and is connected with multiple branch road detection module respectively by the first electrical level transferring chip.
Shown in Figure 1, main frame is made up of bus insulation detection module, main processor modules, display module, alarm module, ultra-low frequency signal module and level conversion module. Bus insulation detection module is responsible for gathering bus total voltage, Bus Voltage and the volts DS source dividing potential drop in internal resistance, and by A/D conversion chip that the voltage signal collected is delivered in main processor modules. A/D conversion chip converts the analog voltage signal received to numerary signal, then by the built-in high speed serial line interface of conversion chip, numerary signal is delivered to main treater CPU. Data and system data after computing, are first compared by main treater CPU by the data signal that receives, and comparative result delivers to alarm module; Then data and comparative result are delivered to display module and upper computer. Main treater CPU adopts high speed, low-power consumption, super anti-interference a new generation 8051 micro-chip STC12C5A60S2, STC12C5A60S2 is unit device cycle (1T) micro-chip, the completely compatible tradition 8051 of instruction code, travelling speed is than tradition 8051 fast 8-12 doubly. A/D conversion chip AD7895 be a fast, 12 A/D conversion chips, clock and a high speed serial line interface in sample/hold amplifier, a sheet in built-in 3.8 microseconds (�� s) gradual approaching A/D converter, a sheet.
Bus insulation detection module:
Described bus insulation detection module comprises the branch road at analog to digital converter, the potentiometer being connected between analog to digital converter and bus, the tributary voltage source being connected between digital to analog converter and bus and feeding isolation circuit place that the input port of the sampled voltage with main processor modules is connected.
Shown in Figure 4, bus insulation detection module is primarily of an equalizing circuit and a volts DS source composition. Equalizing circuit primary responsibility gathers bus total voltage and Bus Voltage. Volts DS source is then used to measure bus insulation situation: volts DS suppresses circuit, by ac bus, ground is injected exchange system through surging; When there being resistance ground connection on ac bus, volts DS forms loop by bus power supply internal resistance and stake resistance, just can be calculated the size of bus system insulation against ground resistance by the dividing potential drop measured on stake resistance.
Branch road detection module:
Described branch insulation detection module comprises the analog selection switch, signal amplifier, prime wave filter, phase ocmparator, rear class wave filter, analog to digital converter, coprocessor and the second electrical level conversion chip that connect successively; Analog selection switch is connected with sensor, and phase ocmparator is connected with ultra-low frequency signal source, and second electrical level conversion chip is connected with the first electrical level transferring chip.
Shown in Figure 2, ultra-low frequency signal source module is used to produce the positive string signal of 2Hz ultralow frequency and the square wave signal with frequency. 2Hz ultra-low frequency signal suppresses circuit, by ac bus, ground is injected exchange system through surging, as shown in figure (two); When having resistance ground connection on ac bus and calculating gained bus insulation resistance value is less than insulation resistance thresholding settings, then main treater CPU starts the program automatically patrolling and examining each branch bar insulation situation. Square wave signal is then used to the signal of synchrotransmitter induction, eliminates the impact that branch road stake resistance is calculated by bus ground capacitance. Sensor is arranged on each branch-path of ac bus, when branch-path has resistance and electric capacity ground connection, ultra-low frequency signal electric current forms current circuit through branch-path, stake resistance and ground capacitance, then being contained on the current sense device on branch-path and produce induced current, the reactance of the size of induced current and stake resistance and ground capacitance formation is inversely proportional to. Sensor current signal through analog switch, amplify circuit, band circuit passband, filtering circuit, A/D change circuit, deliver to branch road detection module CPU and carry out data processing, then deliver to main processor modules by RS485 interface, as shown in Figure 1. Main treater CPU mono-aspect controlling brancher detection module gathers each branch road sensing signal in an orderly manner, receives the data that branch road detection module is sent here on the other hand. The synchronizing signal that phase ocmparator in branch road detection module is sent here by main processor modules and comparison circuit form, its ground capacitance doing to be used for eliminating on branch-path, on the impact of measurement of Grounding Resistance tolerance range, can also overcome asynchronous exchange signal disturbing on bus simultaneously. Main processor modules receives data after treatment, and data are sent liquid-crystal display to report to the police with exporting by one side, pass through communication interface circuit on the other hand by data upload to upper computer. Branch road detection module CPU is the 1T micro-chip STC12C5410AD adopting high speed, low-power consumption, super anti-interference, integrated high-speed A/D conversion.
Ultra-low frequency signal source module:
Shown in Figure 3, ultra-low frequency signal source module is made up of CPU, analog to digital conversion circuit, power magnification circuit and feeding isolation circuit, sees accompanying drawing 3. CPU produces two-way 2Hz, synchronous square wave signal. One road square wave signal is the positive string signal of 2Hz through analog to digital conversion circuit conversion, and positive string signal is injected into bus system by power magnification circuit and feeding isolation circuit. Another road square wave signal then delivers to each branch road detection module as synchronizing signal defendant. Execution instruction is delivered to ultra-low frequency signal source module by serial communication interface by main processor modules, and ultra-low frequency signal source module CPU performs corresponding program according to instruction.
Feature of the present utility model is as follows:
1, branch road is looked into patrol and is adopted feedback signal technology.
Existing exchange system earth detector can only monitor bus insulation situation, and the insulation status for branch bar cannot be monitored. This detector adopts the detection mode of feedback signal to monitor the insulation status of each branch bar, once the insulation decline of certain branch bar, detector can at several minutes inner position insulating fault branch bar.
2, synchronous technology
Newly-built large-scale nuclear power plant and Large Copacity transforming plant protecting device are many, and layout is wide, so the corresponding increase of bus system ground capacitance. When there is electric capacity on ground by system, the electric current signal flowing through sensor is the superposition of stake resistance electric current and capacitive earth current, then the signal of the existing stake resistance of the signal of sensor sensing, has again the signal of ground capacitance. Due to the advanced resistor current of capacitive current 90 ��, in circuit layout, we adopt synchronous technology. Signal generator produces the square wave signal of 2Hz while producing the positive string signal of 2Hz ultralow frequency, be transported to each signal acquisition module by main frame, eliminate the impact of asynchronous induction signal.
3, band-pass filtering
Having various harmonic interference in ac bus system, the signal of sensor sensing is also superposed with various harmonic interference signals by the positive string signal of 2Hz low frequency and forms. For eliminating various harmonic interference, in circuit layout, we adopt center band to be that the bandpass filtering circuit of 2Hz filters various harmonic wave, ensure that the signal extracted is the pure positive string signal of 2Hz low frequency.
Claims (5)
1. exchange system earth detector, it is characterised in that, comprise a main frame, multiple branch road detection module supporting with it and sensor three part; Described main frame comprises bus insulation detection module, main processor modules, display module, alarm module, ultra-low frequency signal module and level conversion module; The sampled voltage input port of bus insulation detection module and main processor modules is connected, display module and alarm module respectively display output port and alarm signal output ends mouth with main processor modules be connected; The steering order signal end of the serial communication port of main processor modules is connected with ultra-low frequency signal source, and this ultra-low frequency signal source synchronizing signal output port is connected with multiple branch road detection module respectively, and sinusoidal wave signal output terminal is connected with ac bus; The transmission and reception instruction signal end of the serial communication port of main processor modules is connected with multiple branch road detection module respectively by the first electrical level transferring chip; Described branch insulation detection module comprises the analog selection switch, signal amplifier, prime wave filter, phase ocmparator, rear class wave filter, analog to digital converter, coprocessor and the second electrical level conversion chip that connect successively; Analog selection switch is connected with sensor, and phase ocmparator is connected with ultra-low frequency signal source, and second electrical level conversion chip is connected with the first electrical level transferring chip; Described sensor is connected on each branch road of ac bus respectively; Described bus insulation detection module comprises the branch road at analog to digital converter, the potentiometer being connected between analog to digital converter and bus, the volts DS source being connected between digital to analog converter and bus and feeding isolation circuit place that the input port of the sampled voltage with main processor modules is connected.
2. exchange system earth detector according to claim 1, it is characterized in that, ultra-low frequency signal module forms primarily of Signal Generator of Ultra-low Frequency, the synchronous signal output end of Signal Generator of Ultra-low Frequency is connected with multiple branch road detection module, and the square wave signal output port of Signal Generator of Ultra-low Frequency is connected with bus by digital to analog converter, power amplifier and feeding shield retaining.
3. exchange system earth detector according to claim 1, it is characterised in that, the serial communication port of main processor modules is connected with upper computer.
4. exchange system earth detector according to claim 1, it is characterised in that, main processor modules adopts 8051 micro-chip STC12C5A60S2.
5. exchange system earth detector according to claim 1, it is characterised in that, branch insulation detection module adopt center band be the bandpass filtering circuit of 2Hz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521004548.XU CN205280861U (en) | 2015-12-07 | 2015-12-07 | Alternating -current system grounding detection appearance |
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| CN201521004548.XU CN205280861U (en) | 2015-12-07 | 2015-12-07 | Alternating -current system grounding detection appearance |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443555A (en) * | 2016-08-30 | 2017-02-22 | 华立科技股份有限公司 | Verification stand with radio interference intensity detection function |
| CN106646084A (en) * | 2016-12-28 | 2017-05-10 | 国网浙江省电力公司台州供电公司 | Distributed interface device of relay protection debugging instrument |
| CN108051695A (en) * | 2018-01-18 | 2018-05-18 | 广州优维电子科技有限公司 | A kind of alternating current-direct current single-phase-to-earth fault analysis instrument and grounding fault alignment system |
| CN108957222A (en) * | 2018-05-17 | 2018-12-07 | 安徽亚智电气有限公司 | Single-phase earth fault line selection analysis method and control system |
-
2015
- 2015-12-07 CN CN201521004548.XU patent/CN205280861U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443555A (en) * | 2016-08-30 | 2017-02-22 | 华立科技股份有限公司 | Verification stand with radio interference intensity detection function |
| CN106443555B (en) * | 2016-08-30 | 2023-08-04 | 华立科技股份有限公司 | Check table body with radio interference intensity detection |
| CN106646084A (en) * | 2016-12-28 | 2017-05-10 | 国网浙江省电力公司台州供电公司 | Distributed interface device of relay protection debugging instrument |
| CN108051695A (en) * | 2018-01-18 | 2018-05-18 | 广州优维电子科技有限公司 | A kind of alternating current-direct current single-phase-to-earth fault analysis instrument and grounding fault alignment system |
| CN108051695B (en) * | 2018-01-18 | 2024-02-27 | 广州优维电子科技有限公司 | AC/DC ground fault analyzer and ground fault finding and positioning system |
| CN108957222A (en) * | 2018-05-17 | 2018-12-07 | 安徽亚智电气有限公司 | Single-phase earth fault line selection analysis method and control system |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160601 Termination date: 20181207 |