CN2791655Y - Earthing network state monitoring system - Google Patents
Earthing network state monitoring system Download PDFInfo
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- CN2791655Y CN2791655Y CN 200520200385 CN200520200385U CN2791655Y CN 2791655 Y CN2791655 Y CN 2791655Y CN 200520200385 CN200520200385 CN 200520200385 CN 200520200385 U CN200520200385 U CN 200520200385U CN 2791655 Y CN2791655 Y CN 2791655Y
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- lonworks
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Abstract
The utility model relates to an earthing network state monitoring system. The utility model is characterized in that four-core cables a, b, c, d are respectively connected to a conductive body of an earthing network at intervals; one end of each the four-core cable is connected to a normally open contact of a respective relay, and normally open contacts on the other ends of the relays are connected with the other group of output four-core cables; the a and the d cables of the four-core cables are also respectively connected to the input terminal of a monitor and the input terminal of an LONWORKS adapter; the output terminal of the LONWORKS adapter is connected to a computer by a communication bus, wherein the b and the c of the four-core cables respectively control a switch K1 and are connected with the movable terminal of a switch K2, the fixed terminal K2_1 of the switch K2 is connected with the output terminal of a DC stabilized supply, and the other fixed terminal K2_2 of the switch K2 is connected with the output terminal of a constant-current source. The system can accurately provide the state of an earthing resistor on site, and a proposal of a measuring system having the advantages of high speed, accuracy, high safety and reliability is provided.
Description
Technical field
The utility model relates to a kind of Receive Ground Mat State Monitoring System.
Technical background
The safe operation of electric system mainly depends on a good ground networks, is called for short earth mat.Whether qualified factor is a lot of to weigh earth mat: whether stake resistance, step voltage, touch voltage, balanced current potential, discharge capacity, erosion resistance etc. meet the safe operation requirement but the key technical indexes still is a stake resistance.Earthing electric network and electrode all can have corrosion in various degree every year, and the stake resistance of grounding apparatus is changed.If the stake resistance of equipment exceeds normal range, do great damage to power system device sometimes.In order to guarantee various electrical equipments and consumer grounded screen (utmost point) device safe and reliable operation in the rules scope, must regularly carry out the measurement inspection work of stake resistance in accordance with regulations.If but because soil changes, it is immeasurable causing equipment ground resistance to exceed the loss that normal range causes device damage to cause.
Summary of the invention
The purpose of this utility model is: provide the system that a cover can 24 hours remote online monitorings, the state that on-the-spot stake resistance is provided promptly and accurately.Receive Ground Mat State Monitoring System is the system that a cover can carry out any point-to-point transmission connection resistance value in the on-line monitoring earth mat, it integrates microcomputer technology, digital communication technology, field bus technique, make and original simple rely on regularly that the measurement of people's power wiring obtains that data become that system controlled by computer reads, storage and print data, and can be intuitively and the video data of multidimensional, thereby saved great amount of manpower and material resources, created condition for finding and get rid of the earth mat corrosion phenomenon timely.It is significant for prolonging grounded screen serviceable life and improving network operation stability.
The utility model is to constitute like this, it is characterized in that: on the conductor of grounded screen, every interval all is connected with quad a, b, c, d for one section, an other end of quad is connected to the normally opened contact of four relays in separately the control relay circuit, the other end normally opened contact correspondence of relay is connected with another group quad of output by corresponding numbering, these two lines of a in the quad, d are connected respectively to the input end of monitor input end and LONWORKS adapter again, and the output terminal of LONWORKS adapter is connected to computing machine by communication bus; These two lines of b in the quad wherein, c are connected with the movable end of the gauge tap K2 of another one dpdt double-pole double-throw (DPDT) by the gauge tap K1 of a double-pole single-throw (D.P.S.T.), a stiff end K2_1 of the K switch 2 of this dpdt double-pole double-throw (DPDT) connects the output terminal of D.C. regulated power supply, and another stiff end K2_2 of the K switch 2 of this dpdt double-pole double-throw (DPDT) connects the output terminal of constant current source; 220 volts civil power is connected respectively to D.C. regulated power supply, constant current source, monitor by after the transformer step-down; Described monitor, be provided with data processor DSP, low-pass filter circuit, A/D change-over circuit, quad is connected to the input end of data processor DSP by low-pass filter circuit and A/D change-over circuit, the output terminal of data processor DSP is connected with the LONWORKS communicating circuit, also is connected with the FLASH storer on another output terminal of data processor DSP; Described relay is common relay.
Than existing Receive Ground Mat State Monitoring System, remarkable advantage of the present utility model is: there is unrivaled advantage in this system than manual measurement in the real-time of measuring, security, has avoided the loss that discovery is in time caused because the variation of stake resistance is failed to a great extent.The characteristics of this system are can 24 hours on-line monitorings, the state that on-the-spot stake resistance is provided promptly and accurately.It is a kind of quick, accurate, safe and reliable measuring system.
Description of drawings
Fig. 1 is a theory diagram of the present utility model.
Fig. 2 is the theory diagram of monitor in the utility model.
Specific embodiment
With reference to Fig. 1, theory diagram of the present utility model, it is characterized in that: on the conductor of grounded screen, every interval all is connected with quad a for one section, b, c, d, an other end of quad is connected to the normally opened contact of four relays in separately the control relay circuit, the other end normally opened contact correspondence of relay is connected with another group quad of output by corresponding numbering, a in the quad, these two lines of d are connected respectively to the input end of monitor input end and LONWORKS adapter again, and the output terminal of LONWORKS adapter is connected to computing machine by communication bus; These two lines of b in the quad wherein, c are connected with the movable end of the gauge tap K2 of another one dpdt double-pole double-throw (DPDT) by the gauge tap K1 of a double-pole single-throw (D.P.S.T.), a stiff end K2_1 of the K switch 2 of this dpdt double-pole double-throw (DPDT) connects the output terminal of D.C. regulated power supply, and another stiff end K2_2 of the K switch 2 of this dpdt double-pole double-throw (DPDT) connects the output terminal of constant current source; 220 volts civil power is connected respectively to D.C. regulated power supply, constant current source, monitor by after the transformer step-down; Described monitor, be provided with data processor DSP, low-pass filter circuit, A/D change-over circuit, quad is connected to the input end of data processor DSP by low-pass filter circuit and A/D change-over circuit, the output terminal of data processor DSP is connected with the LONWORKS communicating circuit, also is connected with the FLASH storer on another output terminal of data processor DSP; Described relay is common relay.
Above-mentioned data processor DSP model is TMS320C541.Described D.C. regulated power supply is the D.C. regulated power supply of direct current 24V output.Described constant current source is the constant current source that is output as 24V/5A.
Above-mentioned LONWORKS adapter can be LONWORKS serial port adapter (SLTA), is connected to computing machine by the RS-232 communication bus; Also can be that LONWORKS network adapter (i-LON100) is connected to computing machine by grid line.
Principle of work of the present utility model is described as follows: this system mainly is made of computing machine, monitor, node (comprising control relay circuit), cable four parts.Wherein, computing machine: follow back monitoring ground net state, show tested grounding resistance and off-limit alarm etc.Monitor: the major control logic of system.Major function has the sending node control command, power supply switching controls, short-circuit protection, voltage measurement etc.Node (comprising control relay circuit): the node of connection device earth point, major function are the orders according to SLTA, being communicated with or disconnection between control survey loop and equipment ground point.Finishing any two internodal resistance measurements need be with four clips (two on voltage folder, two on electric current folder).Therefore, replace the effect of voltage and current folder here with four relays.Cable among the figure: adopt the four-core cable, wherein two cores connect power supply, as the current return between module for power supply and tested two earth points.Other two cores are voltage measurement circuit, simultaneously also as communication line.
By having adopted the two-way power supply in this system as can be seen among Fig. 1, one tunnel interchange 24V power supply that provides for transformer passes through the 24V direct supply that generates behind the rectification module, and another road is the constant current source of 5A.Direct current 24V power supply is used for the power supply to terminal node, when needs are measured resistance value between two earth points, just disconnect AC power, the constant current source of 5A is injected between two measured earth points, just can to two internodal voltages gather and measure at the monitor end this moment, and then converse the measured resistance value.
The course of work of the present utility model is as follows: for example want the stake resistance of 2 of measured node 1 and nodes, process is:
During beginning, relay K 2 meets 24V, and K1 disconnects, and do not power to node (being control relay circuit) this moment.Node (being control relay circuit) current supply circuit is connected in computer control K1 adhesive.Computing machine sends control command by SLTA to node (being control relay circuit), controls corresponding relay adhesive.(this moment, power supply short circuit was to ground, module dead electricity.Because the relay in the control relay circuit is to have the performance that the outage time-delay disconnects, and can continue the attracting state of guard relay.) simultaneously, computer control relay K 2 switches to 24V/5A constant current source place by 24V/DC power supply place.So between two tested nodes, just have electric current to pass through, also just have correspondent voltage to produce simultaneously.At this moment, can measure magnitude of voltage (adopting the mode that 100 values of continuous acquisition are got its mean value in the 1s) by the A/D conversion at the monitoring node place.And send this value back to computing machine.After measurement was finished, computer control relay K 1 disconnected, and with relay K 2 switchback 24V/DC places.System is returned to original state, prepares for measure next time.
The utility model is novel, and is reasonable in design, and result of use is good, has bigger application value.
Claims (5)
1. Receive Ground Mat State Monitoring System, it is characterized in that: on the conductor of grounded screen, every interval all is connected with quad a for one section, b, c, d, an other end of quad is connected to the normally opened contact of four relays in separately the control relay circuit, the other end normally opened contact correspondence of relay is connected with another group quad of output by corresponding numbering, a in the quad, these two lines of d are connected respectively to the input end of monitor input end and LONWORKS adapter again, and the output terminal of LONWORKS adapter is connected to computing machine by communication bus; These two lines of b in the quad wherein, c are connected with the movable end of the gauge tap K2 of another one dpdt double-pole double-throw (DPDT) by the gauge tap K1 of a double-pole single-throw (D.P.S.T.), a stiff end K2_1 of the K switch 2 of this dpdt double-pole double-throw (DPDT) connects the output terminal of D.C. regulated power supply, and another stiff end K2_2 of the K switch 2 of this dpdt double-pole double-throw (DPDT) connects the output terminal of constant current source; 220 volts civil power is connected respectively to D.C. regulated power supply, constant current source, monitor and LONWORKS adapter by after the transformer step-down; Described monitor, be provided with data processor DSP, low-pass filter circuit, A/D change-over circuit, quad is connected to the input end of data processor DSP by low-pass filter circuit and A/D change-over circuit, the output terminal of data processor DSP is connected with the LONWORKS communicating circuit, also is connected with the FLASH storer on another output terminal of data processor DSP; Described relay is the relay that the outage time-delay disconnects.
2. Receive Ground Mat State Monitoring System according to claim 1 is characterized in that: described data processor DSP model is TMS320C541.
3. Receive Ground Mat State Monitoring System according to claim 1 is characterized in that: described D.C. regulated power supply is the D.C. regulated power supply of direct current 24V output.
4. Receive Ground Mat State Monitoring System according to claim 1 is characterized in that: described constant current source is the constant current source that is output as 24V/5A.
5. Receive Ground Mat State Monitoring System according to claim 1, it is characterized in that: described LONWORKS adapter is LONWORKS serial port adapter (SLTA), and being connected to computing machine by the RS-232 communication bus also can be that LONWORKS network adapter (i-LON100) is connected to computing machine by grid line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520200385 CN2791655Y (en) | 2005-05-27 | 2005-05-27 | Earthing network state monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520200385 CN2791655Y (en) | 2005-05-27 | 2005-05-27 | Earthing network state monitoring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2791655Y true CN2791655Y (en) | 2006-06-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520200385 Expired - Fee Related CN2791655Y (en) | 2005-05-27 | 2005-05-27 | Earthing network state monitoring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2791655Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278729A (en) * | 2013-05-03 | 2013-09-04 | 国家电网公司 | Grounding condition tester for high-voltage test |
| CN105044505A (en) * | 2015-07-09 | 2015-11-11 | 云南电网公司电力科学研究院 | Grounding grid DC shunt coefficient measuring method based on high-power DC power supply |
-
2005
- 2005-05-27 CN CN 200520200385 patent/CN2791655Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278729A (en) * | 2013-05-03 | 2013-09-04 | 国家电网公司 | Grounding condition tester for high-voltage test |
| CN103278729B (en) * | 2013-05-03 | 2015-10-28 | 国家电网公司 | Hi-pot test ground connection condition tester |
| CN105044505A (en) * | 2015-07-09 | 2015-11-11 | 云南电网公司电力科学研究院 | Grounding grid DC shunt coefficient measuring method based on high-power DC power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: FUJIAN PROVINCE ELECTRIC POWER TESTING AND RESEARC Free format text: FORMER NAME OR ADDRESS: FUJIAN PROVINCIAL ELECTRIC POWER TEST RESEARCH INSTITUTE |
|
| CP01 | Change in the name or title of a patent holder |
Patentee after: Fujian Electric Power Testing and Research Institute Patentee before: Fujian Electric Power Test Research Institute |
|
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Fujian EPRI Power Commissioning Co., Ltd. Assignor: Fujian Electric Power Testing and Research Institute|Xiamen Yichuang Technology Development Co., Ltd. Contract fulfillment period: 2008.11.30 to 2015.5.22 Contract record no.: 2008350000215 Denomination of utility model: State monitoring system for grounding grid based on industrial personal computer Granted publication date: 20060628 License type: Exclusive license Record date: 20081215 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.11.30 TO 2015.5.22; CHANGE OF CONTRACT Name of requester: FUJIAN ZHONGSHISUO ELECTRIC POWER ADJUSTMENT AND T Effective date: 20081215 |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060628 Termination date: 20130527 |