CN200953038Y - Counterpoise comprehensive parameter testing device - Google Patents
Counterpoise comprehensive parameter testing device Download PDFInfo
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- CN200953038Y CN200953038Y CN 200620078983 CN200620078983U CN200953038Y CN 200953038 Y CN200953038 Y CN 200953038Y CN 200620078983 CN200620078983 CN 200620078983 CN 200620078983 U CN200620078983 U CN 200620078983U CN 200953038 Y CN200953038 Y CN 200953038Y
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Abstract
This utility model discloses one test device of comprehensive parameters of ground grid. It includes one pilot frequency test mains connected to an AC220V mains, one secondary test mains connected to the output terminal of the pilot frequency test mains and one self-contained tester. The secondary test mains is an impedance matching transformer with multi-stage outputs whose 0V terminal is connected to the ground via a downlead. The tester constitutes current induction connection with the test lead wires of connected electrodes via Rogowski coils or constitutes voltage connection with the tested ground grid via the tested voltage electrode. The tester in this utility model is characterized by high resistance to power frequency interference and highly accurate, fast, safe and reliable measurements. It is be used for the comprehensive test and appraisal of operating conditions of ground grid at power plants, substations, distribution stations, etc.
Description
Technical field
The utility model relates to the proving installation of system power ground, particularly a kind of proving installation of earth mat comprehensive parameters.
Background technology
Traditional earth mat proving installation major part is to adopt the power frequency source to come measurement of Grounding Resistance, because flowing through the out-of-balance current of earth mat disturbs the measurement result influence of stake resistance very big in the operation power frequency that earth mat produced, therefore general the employing strengthened injection current, as 50A～100A, reduce the power frequency of test site and disturb, and then improve measuring accuracy.But long test lead can cause mutual voltage increase between the lead-in wire again under the big function of current, cause the increase of measuring error in fact again, and the result loses more than gain.In addition, the traditional test device volume is big, the instrument heaviness, and the measuring process poor stability does not meet the developing direction of modern measuring technology.In recent years, along with the development of grounding technology,, but also comprise comprehensive judgement to every indexs such as earth mat electrical integrity, impedance ground, Potential distribution, step voltage, contact electricitys to the not only just measurement of stake resistance of the testing evaluation of earthing device.The existing at present earth mat proving installation that utilizes the alien frequencies source technology to develop, " JKJ stake resistance different-frequency measure instrument " as domestic production, promptly adopt the alien frequencies signal source of 46～54Hz, overcome the power frequency interference problem to a great extent, but this kind different-frequency measure instrument has restricted the raising of instrument test precision in the deficiency that exists aspect the anti-power frequency interference performance of extraction test signal.
Summary of the invention
The purpose of this utility model is improved at the not high defective of existing earth mat earthing test device to test precision, provide that a kind of anti-power frequency interference performance is strong, test quick and precisely, the proving installation of safe and reliable earth mat comprehensive parameters, and have that volume is little, the characteristics of low cost of manufacture.
For reaching above purpose, the utility model takes following technical scheme to be achieved:
A kind of earth mat testing synthesis parameter device comprises an alien frequencies testing power supply that is connected with the alternating current 220V power supply, second testing power supply that is connected with the output terminal of alien frequencies testing power supply, a discrete tester; Second testing power supply is the impedance-matching transformer of the output of gear more than, and its 0V end connects tested earth mat the earth of living in by down conductor; Described tester constitutes induction by current by ROCOIL coil (Luo-coil) and the test lead that is connected the electric current utmost point and connects, and perhaps constitutes voltage by the test voltage utmost point and tested earth mat and is connected.
In the such scheme, described alien frequencies testing power supply comprises rectifying part and inversion part, is connected by filtering circuit between rectifying part and the inversion part; Described tester comprises a cpu controller, and its output connects LCD display, and the input of cpu controller is connected with keyboard and A/D converter respectively; A/D converter the low-resistance end of input by a selector switch connect the ROCOIL coil; A/D converter also can be connected with trapper by the high resistant end of selector switch, the input connecting band bandpass filter of trapper, and the input of this bandpass filter is connected to the test voltage utmost point by a programmable gain amplifier.The circuit structure of described bandpass filter and trapper mainly is made of the switch-capacitor filtering integrated package and the peripheral resistance of two same models, bandpass filter and the trapper position of integrated package mark separately are different, connect by resistance between two integrated packages, and separately the tenth, the 11 pin and connect after connect together.
The utility model compared with prior art, its beneficial effect is, injects the little electric current alien frequencies constant current signal (1A～10A), avoid power frequency to disturb effectively that is different from power frequency for the earth mat earthed system by alien frequencies testing power supply, impedance matching second testing power supply; Because adopt little electric current input, make the mutual inductance between the measuring lead wire be reduced to minimum again; Tester not only can be tested the impedance ground of earthed system by the switching of selector switch, also can test every comprehensive parameters such as earthed system Potential distribution, step voltage, contact electricity.Particularly tester has adopted bandpass filtering and the trap circuit with numerical control frequency-selecting function, has further improved anti-power frequency interference performance effectively, makes measuring accuracy greatly improve (can reach 3 grades).In addition, the utility model proving installation only need manually be provided with test parameter, and all the other are finished automatically by computing machine, simple to operate, safe ready.
Description of drawings
Fig. 1 is two kinds of user mode synoptic diagram of the utility model device.Wherein Fig. 1 (a) is the user mode when test earth mat electric current; Fig. 1 (b) is the user mode when test earth mat voltage.
Fig. 2 is the circuit structure block diagram of the utility model alien frequencies testing power supply.
Fig. 3 is the circuit structure block diagram of the utility model tester.
Fig. 4 is the circuit theory diagrams of bandpass filter and trapper among Fig. 3.
Fig. 5 is the synoptic diagram of step voltage and touch voltage test.
Embodiment
Below in conjunction with drawings and the specific embodiments the utility model is described in further detail:
As shown in Figure 1, a kind of proving installation of earth mat comprehensive parameters comprises that one can produce the testing power supply 1 of alien frequencies, constant current, frequency stabilized power source, and its input end connects the 220V AC power; The testing power supply 2 that is connected with the output of testing power supply 1 is the impedance-matching transformer of the output of gear more than, five grades of different test voltages of exportable 0～440V.Circuit connection diagram when Fig. 1 (a) injects the terrestrial current test for the utility model device, the 0V end of testing power supply 2 connects tested earth mat the earth G of living in by down conductor E, select one of five voltage output ends,, connect the electric current utmost point C of the drill rod of being driven underground by test lead D as the 440V end; By the impedance-matching transformer of testing power supply 1 and testing power supply 2, can be tested earth mat, frequency is provided is the injection current (concrete magnitude value determined by the tester according to test condition) of 30Hz～80Hz, 1A～10A.Tester 3 constitutes induction by ROCOIL coil 27 with the test lead D that is connected electric current utmost point C and connects, to obtain the current parameters of tested earth mat.
As shown in Figure 2, testing power supply 1 comprises rectifying part 15 and inversion part 16, is connected by filtering circuit 12 between rectifying part 15 and the inversion part 16.Rectifying part 15 is made of rectifier control circuit 10 and rectifier bridge 11; Inversion part 16 is made of inversion control part 13 and inverter bridge 14.The 220V AC power through filtering circuit 12 filtering, again through the 16 controlled inversions of inversion part, just can obtain the testing power supply output of 30Hz～80Hz, 0～20A through rectifying part 15 controlled rectifications.
The two-phase power frequency ac voltage of rectifying part 15 input, through controlled silicon full-bridge rectification, LC filtering can obtain exporting from 0V-220V and changes the input end that DC voltage is connected to inversion part 16 continuously.The high-performance phase-shift trigger ic is adopted in the triggering of rectifier bridge 11, and phase shift range is wide, and it is good to export four consistency pulses, has guaranteed that the ripple of output dc voltage is less; Rectifier control circuit 10 adopts PI (proportional integral) circuit conditioning, can realize floating adjusting given and feedback, voltage is stabilized on the set-point, to reach the purpose of constant current.
The inverter bridge 14 of inversion part 16 adopts two high-power IGBT elements to form the H bridge, under the inverter signal control of IGBT in inverter control circuit 13 (insulated gate bipolar transistor) driving circuit, make IGBT element alternate conduction on two diagonal line, form alien frequencies output voltage and electric current, inverter control circuit 13 also is provided with voltage sample circuit, current sampling circuit and frequency stabilization circuit, can the phase place of output voltage and electric current be compared, and the frequency of IGBT driving circuit control signal made correction, consistent until voltage, as to reach frequency stabilization purpose with the phase place of electric current.
As shown in Figure 3, tester 3 comprises a cpu controller 24, can select the W78E516B type for use, and its output connects LCD display 23, and the input of cpu controller 24 is connected with keyboard 25 and A/D converter 26 respectively; A/D converter the low-resistance end 1k Ω of input by a selector switch K connect ROCOIL coil 27, in order to measure the current parameters of tested earth mat.A/D converter 26 also can be connected with the trapper 22 of 50Hz by the high resistant end 1M Ω of selector switch K, the input connecting band bandpass filter 21 of trapper 22, the input of this bandpass filter 21 is connected to test voltage utmost point P by a programmable gain amplifier 20, in order to measure the voltage parameter of tested earth mat.Can be set the measurement parameter of tester by keyboard 25.
As shown in Figure 4, bandpass filter 21 mainly is made of the LMF100 type switch-capacitor filtering integrated package and the peripheral resistance of two 20 pin with trapper 22 circuit structures, bandpass filter 21
LMF100 MarkThe position is SF0; The LMF100 mark position of trapper 22 is SF2, and it connects two by resistance R 28 each other
LMF10010, the 11 pin back that connects together connect.The SF0 position
LMF100Connect programmable gain amplifier 20 outputs by potentiometer P3 and resistance R 21,22,23; The LMF100 of SF2 position connects the input high resistant end of A/D converter 26 by electric capacity E2, the E6 of resistance R 43, negative pole butt joint.Input voltage is after programmable gain amplifier 20 amplifies, the circuit that the bandpass filter of passing through 21 and the capacitor filtering integrated package of trapper 22 constitute the not voltage signal of selected frequencies filters, deliver to A/D converter 26 back outputs again, thereby reach the purpose of frequency-selecting.
Another kind of user mode of the present utility model is shown in Fig. 1 (b), the 0V end of testing power supply 2 connects tested earth mat the earth G of living in by down conductor E, select one of five voltage output ends,, connect the electric current utmost point C of the drill rod of being driven underground by test lead D as the 440V end; Impedance-matching transformer by testing power supply 1 and testing power supply 2, can be tested earth mat, frequency is provided is the injection current (concrete magnitude value determined by the tester according to test condition) of 30Hz～80Hz, 1A～10A, the earth terminal of tester 3 is connected tested earth mat the earth G of living in, the voltage tester end connects a voltage pole P who is made by the copper dish, can test the parameters such as Potential distribution, step voltage, contact electricity of earthed system.
As shown in Figure 5, step voltage is meant when earth short circuit current flows through earthing device that horizontal range is 2 the potential difference (PD) of 0.8m on the ground, and step voltage is that the bipod of human body contacts the voltage that above-mentioned 2 points (0.8m) are born at interval the time; Touch voltage is meant when earth short circuit current flows through earthing device, horizontal range from power equipment is 0.8m place (sheet metal of anthropomorphic dummy's pin) on the ground, vertical range along device housings, framework is the potential difference (PD) at 2 at 1.8m place, and touch voltage refers to the voltage that human body is born when contacting at above-mentioned 2.Among the figure: V1, V2---the high input impedance voltage table; P---the sheet metal of anthropomorphic dummy's pin; Rm---the resistance of simulation human body; G---earthing device; C---measure and use the electric current utmost point.
The frequency of testing power supply 1 of the present utility model is transferred to setting value, by tester 3 simulation human body impedance 1k Ω, the touch voltage and the step voltage of correspondence when measuring respectively by the grounded screen injection current, when inject the earth by earthing device is maximum short circuit current value when being Imax, and the corresponding touch voltage and the maximal value of step voltage are respectively:
Ujmax＝UjImax/I
Ukmax＝UkImax/I
I, Uj, Uk in the formula---pass through measuring current and the touch voltage of correspondence and the measured value of step voltage of earthing device during on-the-spot test.
Claims (6)
1. the proving installation of an earth mat comprehensive parameters, it is characterized in that, comprise a testing power supply that is connected with the alternating current 220V power supply (1), a discrete tester (3), the output terminal of described testing power supply (1) is connected with a testing power supply (2), the voltage output end of testing power supply (2) connects the electric current utmost point (C) of the drill rod of being driven underground by test lead (D), and the 0V end of testing power supply (2) connects tested earth mat the earth of living in (G) by down conductor (E); Described tester (3) constitutes induction by current by Luo-coil (27) and the test lead that is connected the electric current utmost point (C) (D) and connects, and perhaps constitutes voltage by the test voltage utmost point (P) and tested earth mat and is connected.
2. the proving installation of earth mat comprehensive parameters according to claim 1 is characterized in that, described testing power supply (1) comprises rectifying part (15) and inversion part (16), is connected by filtering circuit (12) between rectifying part (15) and the inversion part (16).
3. the proving installation of earth mat comprehensive parameters according to claim 1 is characterized in that, described testing power supply (2) is the impedance-matching transformer of the output of gear more than.
4. according to the proving installation of the described earth mat comprehensive parameters of one of claim 1～3, it is characterized in that, described tester (3) comprises a cpu controller (24), and its output connects LCD display (23), and the input of cpu controller (24) is connected with keyboard (25) and A/D converter (26) respectively; The input of A/D converter (26) connects Luo-coil (27) by the low-resistance end of a selector switch (K).
5. the proving installation of earth mat comprehensive parameters according to claim 4, it is characterized in that, described A/D converter (26) is connected with trapper (22) by the high resistant end of selector switch (K), the input connecting band bandpass filter (21) of trapper (22), the input of this bandpass filter (21) connects the output of programmable gain amplifier (20), and the voltage input of the test voltage utmost point (P) is connected to programmable gain amplifier (20).
6. the proving installation of earth mat comprehensive parameters according to claim 5, it is characterized in that, described bandpass filter (21) mainly is made of the switch-capacitor filtering integrated package and the peripheral resistance of two same models with trapper (22) circuit structure, and the integrated package mark position of bandpass filter (21) is SF0; The integrated package mark position of trapper (22) is SF2, connect by resistance R 28 between two integrated packages, integrated package separately the 10th, the 11st pin and connect after connect together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620078983 CN200953038Y (en) | 2006-05-15 | 2006-05-15 | Counterpoise comprehensive parameter testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620078983 CN200953038Y (en) | 2006-05-15 | 2006-05-15 | Counterpoise comprehensive parameter testing device |
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| CN200953038Y true CN200953038Y (en) | 2007-09-26 |
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| CN 200620078983 Expired - Fee Related CN200953038Y (en) | 2006-05-15 | 2006-05-15 | Counterpoise comprehensive parameter testing device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680931A (en) * | 2012-05-09 | 2012-09-19 | 南京安吉特电气科技有限公司 | Calibrating device for grounding connection parameter testing systems |
| CN105891605A (en) * | 2014-11-04 | 2016-08-24 | 国电龙源电气有限公司 | Distribution transformer grounding resistor, current online measurement equipment and method thereof |
| CN106771639A (en) * | 2016-12-14 | 2017-05-31 | 国家电网公司 | High pressure pole tower ground resistance on-line monitoring system |
| CN107037256A (en) * | 2017-03-31 | 2017-08-11 | 中广核核电运营有限公司 | Ground detection device |
| CN107102207A (en) * | 2016-12-02 | 2017-08-29 | 国家电网公司 | A kind of earth loop impedance test instrument controlled based on microcomputer with signal transacting |
| CN107329015A (en) * | 2017-07-04 | 2017-11-07 | 李景禄 | A kind of personal safety simulation test method and its device |
| CN108767984A (en) * | 2018-06-06 | 2018-11-06 | 中国铁路设计集团有限公司 | A kind of traction institute earth mat intelligent monitoring device |
| CN109459617A (en) * | 2018-01-05 | 2019-03-12 | 嘉兴市恒创电力设备有限公司 | The ground loop resistance measurement method of power test grounding intelligent prior-warning device |
| CN110244127A (en) * | 2019-07-30 | 2019-09-17 | 广东电网有限责任公司 | A kind of the frequency sweep impedance test device and method of transformer |
-
2006
- 2006-05-15 CN CN 200620078983 patent/CN200953038Y/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680931B (en) * | 2012-05-09 | 2014-04-09 | 南京安吉特电气科技有限公司 | Calibrating device for grounding connection parameter testing systems |
| CN102680931A (en) * | 2012-05-09 | 2012-09-19 | 南京安吉特电气科技有限公司 | Calibrating device for grounding connection parameter testing systems |
| CN105891605A (en) * | 2014-11-04 | 2016-08-24 | 国电龙源电气有限公司 | Distribution transformer grounding resistor, current online measurement equipment and method thereof |
| CN107102207A (en) * | 2016-12-02 | 2017-08-29 | 国家电网公司 | A kind of earth loop impedance test instrument controlled based on microcomputer with signal transacting |
| CN106771639B (en) * | 2016-12-14 | 2019-11-15 | 国家电网有限公司 | High pressure pole tower ground resistance on-line monitoring system |
| CN106771639A (en) * | 2016-12-14 | 2017-05-31 | 国家电网公司 | High pressure pole tower ground resistance on-line monitoring system |
| CN107037256A (en) * | 2017-03-31 | 2017-08-11 | 中广核核电运营有限公司 | Ground detection device |
| CN107037256B (en) * | 2017-03-31 | 2020-02-11 | 中广核核电运营有限公司 | Grounding detection device |
| CN107329015A (en) * | 2017-07-04 | 2017-11-07 | 李景禄 | A kind of personal safety simulation test method and its device |
| CN107329015B (en) * | 2017-07-04 | 2020-04-21 | 李景禄 | Human safety simulation test method and device |
| CN109459617A (en) * | 2018-01-05 | 2019-03-12 | 嘉兴市恒创电力设备有限公司 | The ground loop resistance measurement method of power test grounding intelligent prior-warning device |
| CN109459617B (en) * | 2018-01-05 | 2020-12-22 | 嘉兴市恒创电力设备有限公司 | Method for measuring resistance of grounding loop of intelligent grounding early warning device in power test |
| CN108767984A (en) * | 2018-06-06 | 2018-11-06 | 中国铁路设计集团有限公司 | A kind of traction institute earth mat intelligent monitoring device |
| CN110244127A (en) * | 2019-07-30 | 2019-09-17 | 广东电网有限责任公司 | A kind of the frequency sweep impedance test device and method of transformer |
| CN110244127B (en) * | 2019-07-30 | 2021-03-12 | 广东电网有限责任公司 | Device and method for testing frequency sweeping impedance of transformer |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070926 Termination date: 20150515 |
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| EXPY | Termination of patent right or utility model |