CN106054093A - Anti-power line interference capability assessment device of grounding device tester - Google Patents
Anti-power line interference capability assessment device of grounding device tester Download PDFInfo
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- CN106054093A CN106054093A CN201610355088.8A CN201610355088A CN106054093A CN 106054093 A CN106054093 A CN 106054093A CN 201610355088 A CN201610355088 A CN 201610355088A CN 106054093 A CN106054093 A CN 106054093A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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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
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- General Physics & Mathematics (AREA)
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention belongs to the technical field of performance verification of a ground network test instrument of an electric power system, especially relates to an anti-power line interference capability assessment device of a grounding device tester, and particularly provides a device for verifying performance of a grounding device tester. The anti-power line interference capability assessment device of the grounding device tester is a device for performing weak voltage signal measurement on a grounding resistor of the grounding device tester and a grounding network. A different-frequency current is injected into the grounding network firstly, and the current forms a loop between the grounding network and a current pole. The device can effectively assess the anti-power line interference capability of grounding resistor measurement of the grounding device tester and weak voltage signal measurement, and ensure a purchased instrument to be capable of obtaining an accurate and real grounding device characteristic parameter when a field test is performed.
Description
Art
The invention belongs to power system earth mat test instrunment qualification technical field, particularly relate to a kind of grounding device tester
Anti-Hz noise capability evaluation device.A kind of device for verifying grounding device tester performance.
Background technology
Grounding device is the important protection device in electrical network, is to ensure that power system safety and stability runs and ensures and runs
One of important measures of personnel's personal safety.The safety and reliability of grounding device is constantly subjected to produce and the height of the department of operation
Degree is paid attention to.Currently for state estimation many employings alien frequencies method of grounding device, interference electric current is divided with measuring signal code
Separate out, be allowed to not enter measurement system, to eliminate the zero-sequence current impact on earth loop impedance test.It is used for connecing based on this principle
The test apparatus of ground unit state assessment is a lot, but the test apparatus of each producer for power frequency component capacity of resisting disturbance not
The most identical, therefore for this phenomenon, ground connection device to test instrument anti-Hz noise ability can be entered in the urgent need to a kind of device
Row assessment.
Summary of the invention
In place of above-mentioned the deficiencies in the prior art, the present invention provides a kind of anti-power frequency of grounding device tester to do
Disturb capability evaluation device.Its object is to for on-the-spot actual earth resistance situation, build test loop, by increasing work
Ground connection device to test instrument grounding resistance measurement and weak voltage signal are surveyed by the power current in the transformer station of voltage source dry run frequently
The anti-Hz noise ability of amount is estimated analyzing.
In order to realize foregoing invention purpose, the present invention is achieved through the following technical solutions:
A kind of grounding device tester anti-Hz noise capability evaluation device, is to ground connection device to test instrument earth resistance and right
Grounded screen carries out the device that weak voltage signal measures；
When being used for ground connection device to test instrument grounding resistance measurement, this device is by the earth resistance on earth resistance tester
Tester electric current pole C1 is connected with equivalent current electrode resistance Rc, and equivalent current electrode resistance Rc connects with simulating tested earth resistance Rg
Connect, simulate tested earth resistance Rg and be connected with earth resistance tester electric current pole C2, constitute current loop；Power frequency electric potential source defeated
Go out end and be connected to the input of isolating transformer Tr；Earth resistance tester voltage pole P1 on earth resistance tester and equivalence
Voltage pole resistance Rp connects, and equivalent voltage electrode resistance Rp is connected with an outfan of isolating transformer Tr, isolating transformer Tr
Another outfan is connected with simulating tested earth resistance Rg, simulate tested earth resistance Rg and earth resistance tester voltage
Pole P2 connects and composes voltage circuit.
Described time grounded screen is carried out light current pressure signal measurement, by one end of frequency conversion type experiment power supply and divider resistance Rm
It is connected, divider resistance Rm and simulation measured resistance RLConnect, simulate measured resistance RLConnect with the other end of frequency conversion type experiment power supply
Connect the tested loop of composition；Frequency-selecting ammeter wiring terminal A on frequency-selecting ammeter and simulation measured resistance RLConnect, frequency-selecting electric current
Table binding post B and simulation measured resistance RLConnect, constitute test loop；The outfan of power frequency electric potential source is connected to isolate transformation
The input of device Tr, the outfan of isolating transformer Tr is connected with adjustable resistance R, adjustable resistance R and simulation measured resistance RLEven
Connect, another outfan of isolating transformer Tr and simulation measured resistance RLConnect, constitute interference loop.
Described power frequency electric potential source, in the case of power frequency electric potential source does not puts into, frequency-selecting ammeter is connect by frequency-selecting ammeter
Line terminals A and frequency-selecting ammeter wiring terminal B are connected to simulate measured resistance RLTwo ends, measure analog measured resistance RLVoltage
Value.
The method that described a kind of grounding device tester anti-Hz noise capability evaluation device is estimated, is that employing is different
Frequently when method carries out earth resistance or Resistance of Grounding Grids measurement, first grounded screen being injected a non-power-frequency current, electric current is connecing
Form loop between earth mat and electric current pole, obtain a Potential distribution on grounded screen surrounding earth surface；Then zero potential is chosen
Reference point arranges boost voltage pole, fetches the voltage signal of zero-potential point from boost voltage pole, i.e. can get the ground connection of grounded screen
Resistance value.
Described earth resistance, when assessing grounding resistance measurement anti-Hz noise ability, first by earth resistance tester
Suitable frequency and suitable size are transferred in power supply output, in the case of power frequency electric potential source does not puts into, survey with earth resistance tester
The value of tested earth resistance Rg is intended in die trial, and then power frequency electric potential source switches on power, and produces interference signal through isolating transformer Tr,
Observe the resistance value of earth resistance tester test, compare with test value when not adding interference, assess earth resistance and survey
Examination instrument anti-Hz noise performance indications.
When described Resistance of Grounding Grids is measured, in the case of power frequency electric potential source puts into, in simulation measured resistance RLOn
Generation power-frequency voltage disturbs；First the output of frequency conversion type experiment power supply is transferred to suitable frequency (non-power frequency) and suitable size, when
When power frequency electric potential source 7 and isolating transformer Tr are not powered on, record the magnitude of voltage U of now frequency selective voltmeter test1；Connect power frequency
After voltage source 7 and isolating transformer Tr, by regulating the size of adjustable resistance R, can be in simulation measured resistance RLUpper generation is not
Same Hz noise voltage, magnitude of voltage U2, U2 and the U1 of record frequency selective voltmeter test compares the most again, assesses choosing
Frequently voltmeter anti-Hz noise performance indications.
Hinge structure of the present invention has the advantage that and beneficial effect:
The present invention can effectively assess the anti-power frequency of grounding device tester grounding resistance measurement and light current pressure signal measurement and do
Disturb ability, it is ensured that grounding device characterisitic parameter accurate, real when the instrument of buying is tested at the scene, can be obtained.
The present invention is further detailed explanation with specific embodiment below in conjunction with the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is that apparatus of the present invention assess grounding resistance measurement anti-Hz noise ability wiring diagram；
Fig. 2 is apparatus of the present invention assessment light current pressure signal measurement anti-Hz noise ability wiring diagrams
In figure: earth resistance tester 1, earth resistance tester electric current pole C12, earth resistance tester voltage pole P1 3, etc.
Effect voltage pole resistance Rp4, equivalent current electrode resistance Rc 5, simulate tested earth resistance Rg6, power frequency electric potential source 7, earth resistance is surveyed
Examination instrument voltage pole P2 8, earth resistance tester electric current pole C2 9, isolating transformer Tr10, adjustable resistance R11, frequency-selecting ammeter
12, frequency conversion type experiment power supply 13, frequency-selecting ammeter wiring terminal A 14, frequency-selecting ammeter wiring terminal B15, simulate measured resistance
RL 16, divider resistance Rm17.
Detailed description of the invention
The present invention is a kind of grounding device tester anti-Hz noise capability evaluation device.As it can be seen, in Fig. 1, connecing
Earth resistance tester electric current pole C12 on earth resistance tester 1 is connected with equivalent current electrode resistance Rc 5, and equivalent current is the most electric
Resistance Rc 5 is connected with simulating tested earth resistance Rg6, simulates tested earth resistance Rg 6 and earth resistance tester electric current pole C29
Connect, constitute current loop；The outfan of power frequency electric potential source 7 is connected to the input of isolating transformer Tr10；Earth resistance is surveyed
Examination instrument 1 on earth resistance tester voltage pole P13 be connected with equivalent voltage electrode resistance Rp4, equivalent voltage electrode resistance Rp4 and every
An outfan from transformator Tr10 connects, another outfan of isolating transformer Tr10 and the tested earth resistance of simulation
Rg6 connects, and simulates tested earth resistance Rg 6 and earth resistance tester voltage pole P2 8 and connects and composes voltage circuit
In Fig. 2, one end of frequency conversion type experiment power supply 13 is connected with divider resistance Rm17, divider resistance Rm17 and the tested electricity of simulation
Resistance RL16 connect, and simulate measured resistance RL16 connect and compose tested loop with the other end of frequency conversion type experiment power supply 13；Frequency-selecting electric current
Frequency-selecting ammeter wiring terminal A14 on table 12 and simulation measured resistance RL16 connect, frequency-selecting ammeter wiring terminal B15 and mould
Intend measured resistance RL 16 connect, and constitute test loop；The outfan of power frequency electric potential source 7 is connected to the input of isolating transformer Tr10
End, the outfan of isolating transformer Tr10 is connected with adjustable resistance R11, adjustable resistance R11 and simulation measured resistance RL16 connect,
Another outfan of isolating transformer Tr10 and simulation measured resistance RL16 connect, and constitute interference loop.
The method utilizing the present invention a kind of grounding device tester anti-Hz noise capability evaluation device to be estimated is:
When using alien frequencies method to carry out Resistance of Grounding Grids measurement, first grounded screen being injected a non-power-frequency current, electric current is connecing
Form loop between earth mat and electric current pole, obtain a Potential distribution on grounded screen surrounding earth surface.Then zero potential is chosen
Reference point arranges boost voltage pole, fetches the voltage signal of zero-potential point from boost voltage pole, i.e. can get the ground connection of grounded screen
Resistance value.
In the actual test process, owing to running superposition power current in the grounded screen of transformer station, if test instrunment
Capacity of resisting disturbance for power frequency component is not strong, certainly will have a huge impact final test result.
The present invention is directed to on-the-spot actual earth resistance situation, build test loop, by increasing power frequency electric potential source mould
The power current intending running in transformer station is to ground connection device to test instrument grounding resistance measurement and the anti-power frequency of light current pressure signal measurement
Interference performance is estimated analyzing.
As it is shown in figure 1, in FIG, electric current pole C1 2, the voltage pole P13 of earth resistance tester 1 and electric current pole C2 9,
Voltage pole P2 8 constitutes loop through equivalent current electrode resistance Rc 5 and equivalent voltage electrode resistance Rp 4, the tested ground connection of test simulation
Resistance Rg 6.Adding power frequency electric potential source 7 imitating substation Hz noise in voltage circuit, the outfan of power frequency electric potential source 7 is even
Receiving the input of isolating transformer Tr10, isolating transformer Tr10 is the magnitude of voltage for regulating Hz noise.
During assessment grounding resistance measurement anti-Hz noise ability, first it is transferred to close by the output of earth resistance tester 1 power supply
Suitable frequency (non-power frequency) and suitable size, in the case of power frequency electric potential source 7 does not puts into, test mould with earth resistance tester 1
Intending the value of tested earth resistance Rg6, then power frequency electric potential source 7 switches on power, and produces interference signal through isolating transformer Tr10,
Observe the resistance value of earth resistance tester test, compare with test value when not adding interference, assess earth resistance and survey
Examination instrument anti-Hz noise performance indications.
In Fig. 2, frequency conversion type experiment power supply 13 and divider resistance Rm17 and simulation measured resistance RL16 constitute tested loop, work
Frequently the outfan of voltage source 7 is connected to the input of isolating transformer Tr10.In the case of power frequency electric potential source 7 does not puts into, choosing
Frequently ammeter 12 is connected to simulate measured resistance by frequency-selecting ammeter wiring terminal A14 and frequency-selecting ammeter wiring terminal B 15
RL16 two ends, measure analog measured resistance RLThe magnitude of voltage of 16.
When grounded screen is carried out light current pressure signal measurement, in the case of power frequency electric potential source 7 puts into, in simulation measured resistance
RLPower-frequency voltage interference is produced on 16.First the output of frequency conversion type experiment power supply 13 is transferred to suitable frequency (non-power frequency) and suitable
Size, when power frequency electric potential source 7 and isolating transformer Tr10 are not powered on, records the magnitude of voltage of now frequency selective voltmeter 12 test
U1.After connecting power frequency electric potential source 7 and isolating transformer Tr10, by regulating the size of adjustable resistance R11, can be tested in simulation
Resistance RLDifferent Hz noise voltage, the most again magnitude of voltage U2, U2 and the U1 of record frequency selective voltmeter test is produced on 16
Compare, assess frequency selective voltmeter anti-Hz noise performance indications.
Claims (6)
1. a grounding device tester anti-Hz noise capability evaluation device, is characterized in that: to ground connection device to test instrument ground connection
Resistance and grounded screen is carried out the device that weak voltage signal measures；
When being used for ground connection device to test instrument grounding resistance measurement, this device is by the ground connection on earth resistance tester (1)
Resistance meter electric current pole C1(2) with equivalent current electrode resistance Rc(5) be connected, equivalent current electrode resistance Rc(5) and with simulation tested
Earth resistance Rg(6) connect, simulate tested earth resistance Rg(6) with earth resistance tester electric current pole C2(9) is connected, composition is electric
Flow back to road；The outfan of power frequency electric potential source (7) is connected to isolating transformer Tr(10) input；Earth resistance tester (1)
On earth resistance tester voltage pole P1(3) with equivalent voltage electrode resistance Rp(4) be connected, equivalent voltage electrode resistance Rp(4) with
Isolating transformer Tr(10) outfan connect, isolating transformer Tr(10) another outfan with simulate tested ground connection
Resistance Rg(6) connect, simulate tested earth resistance Rg (6) and connect and compose voltage with earth resistance tester voltage pole P2 (8)
Loop.
A kind of grounding device tester anti-Hz noise capability evaluation device the most according to claim 1, is characterized in that: institute
State grounded screen is carried out light current pressure signal measurement time, by one end and the divider resistance Rm(17 of frequency conversion type experiment power supply (13)) phase
Connect, divider resistance Rm(17) and simulation measured resistance RL(16) connect, simulate measured resistance RL(16) with frequency conversion type experiment power supply
(13) the other end connects and composes tested loop；Frequency-selecting ammeter wiring terminal A(14 on frequency-selecting ammeter (12)) and simulation
Measured resistance RL(16) connect, frequency-selecting ammeter wiring terminal B(15) and simulation measured resistance RL(16) connect, constitute and test back
Road；The outfan of power frequency electric potential source (7) is connected to isolating transformer Tr(10) input, isolating transformer Tr(10) output
Hold and adjustable resistance R(11) be connected, adjustable resistance R(11) and simulation measured resistance RL(16) connect, isolating transformer Tr(10)
Another outfan with simulation measured resistance RL(16) connect, constitute interference loop.
A kind of grounding device tester anti-Hz noise capability evaluation device the most according to claim 1, is characterized in that: institute
Stating power frequency electric potential source (7), in the case of power frequency electric potential source (7) does not puts into, frequency-selecting ammeter (12) is connect by frequency-selecting ammeter
Line terminals A(14) and frequency-selecting ammeter wiring terminal B(15) be connected to simulate measured resistance RL(16) two ends, measure analog is tested
Resistance RL(16) magnitude of voltage.
4. utilize a kind of grounding device tester as claimed in claim 1 anti-Hz noise capability evaluation device to be estimated
Method, is characterized in that:
When using alien frequencies method to carry out earth resistance or Resistance of Grounding Grids measurement, first grounded screen is injected an alien frequencies electricity
Stream, electric current forms loop between grounded screen and electric current pole, obtains a Potential distribution on grounded screen surrounding earth surface；Then
Choose Zero potential reference and boost voltage pole is set, fetch the voltage signal of zero-potential point from boost voltage pole, i.e. can be connect
The grounding resistance of earth mat.
Utilization the most according to claim 4 a kind of grounding device tester anti-Hz noise energy as claimed in claim 1
The method that force estimation device is estimated, is characterized in that: described earth resistance, when assessment grounding resistance measurement anti-Hz noise energy
During power, first suitable frequency and suitable size are transferred in the output of earth resistance tester power supply, do not put at power frequency electric potential source
In the case of, by the value of earth resistance tester test simulation tested earth resistance Rg, then power frequency electric potential source switches on power, and passes through
Isolating transformer Tr produces interference signal, observes the resistance value of earth resistance tester test, with test value when not adding interference
Compare, assess earth resistance tester anti-Hz noise performance indications.
Utilization the most according to claim 4 a kind of grounding device tester anti-Hz noise energy as claimed in claim 1
The method that force estimation device is estimated, is characterized in that: when described Resistance of Grounding Grids is measured, when power frequency electric potential source input
In the case of, in simulation measured resistance RLUpper generation power-frequency voltage disturbs；First the output of frequency conversion type experiment power supply is transferred to properly
Frequency (non-power frequency) and suitable size, when power frequency electric potential source 7 and isolating transformer Tr are not powered on, record now frequency-selecting voltage
The magnitude of voltage U of table test1；After connecting power frequency electric potential source 7 and isolating transformer Tr, by regulating the size of adjustable resistance R, permissible
In simulation measured resistance RLThe Hz noise voltage that upper generation is different, the most again magnitude of voltage of record frequency selective voltmeter test
U2, U2 and U1 compare, and assess frequency selective voltmeter anti-Hz noise performance indications.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610355088.8A CN106054093B (en) | 2016-05-25 | 2016-05-25 | A kind of anti-Hz noise capability evaluation device of earthing or grounding means tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610355088.8A CN106054093B (en) | 2016-05-25 | 2016-05-25 | A kind of anti-Hz noise capability evaluation device of earthing or grounding means tester |
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| CN106054093A true CN106054093A (en) | 2016-10-26 |
| CN106054093B CN106054093B (en) | 2019-01-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108710097A (en) * | 2018-04-11 | 2018-10-26 | 中国电力科学研究院有限公司 | A kind of method and system for synthesizing mixed signal in single transmission path |
| CN110805934A (en) * | 2019-11-14 | 2020-02-18 | 广东美的厨房电器制造有限公司 | Electric cooking device and heating control device thereof |
| CN111736105A (en) * | 2020-08-04 | 2020-10-02 | 云南电力技术有限责任公司 | Device and method for testing anti-interference performance of frequency-selecting voltmeter |
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| CN106054093B (en) | 2019-01-29 |
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