CN206193104U - Measurement device for distribution transformer earth impedance , power consumption - Google Patents
Measurement device for distribution transformer earth impedance , power consumption Download PDFInfo
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- CN206193104U CN206193104U CN201621216284.9U CN201621216284U CN206193104U CN 206193104 U CN206193104 U CN 206193104U CN 201621216284 U CN201621216284 U CN 201621216284U CN 206193104 U CN206193104 U CN 206193104U
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Abstract
The utility model relates to a distribution transformer earth impedance, power consumption measuring device. Time saving and labor saving, and detection efficiency is greatly improved. Transformer neutral conductor voltage analog volume processing module passes through ADC analog -to -digital conversion module no. 1, connects central data processing module, and the transformer neutral conductor current mode volume of planning processing module passes through ADC analog -to -digital conversion module no. 2, connects central data processing module, central data processor module, data storage module, data disaply moudle, communication module are connected respectively in its output. The utility model discloses it is remarkably productive, realize the invention purpose completely.
Description
Technical field
The utility model is related to a kind of distribution transformer earthing impedance, the measuring method of power attenuation and device.
Background technology
10kV distribution transformers neutral point grounding electrode receives harmful substance electrochemical reaction, and corrosion effectively causes earth resistance increasing
Greatly.For a long time by system out-of-balance current, the heat of generation causes Soil Surrounding to dry, cause transformer neutral point ground wire with
Voltage difference is produced between the earth, kwh loss is caused.Earth resistance and out-of-balance current are bigger, and that causes low-voltage distribution system has
Work(power attenuation is bigger.Grounding resistance increases, and causes lightning arrestor movement voltage to raise, it is impossible to discharge thunder and lightning mistake by setting value
Pressure, triggers Distribution Transformer Burning.Transformer neutral point resistance increases, the earth leakage circuit-breaker failure for causing distribution system to install
Tripping.
Conventional ground resistance measuring instrument, what is measured is linear DC resistance, and DC resistance cannot be used for
Parameters are analyzed and calculated during power system normally runs.Conventional ground resistance measuring instrument, the DC resistance of measurement, together
Sample cannot be used for the analysis of each item data in transformer actual motion and calculate.
Three-phase load unbalance in collection low pressure 380V distribution systems operation, the current value produced in transformer neutral point,
To 8 meters of magnitudes of voltage in addition greatly between ground, what is calculated is that nonlinear impedance value, current value are calculated to collection transformer neutral point
Out power attenuation, could match with system items service data.
Utility model content
Utility model purpose of the present utility model is that a kind of distribution transformer earthing impedance of offer, the survey of power attenuation
Amount device.By the utility model, can meter calculate the impedance value of transformer neutral point earthing pole corrosion resistance increase, meter
The increase of transformer neutral point impedance ground is calculated, causes the active energy caused by 380V low-voltage distributing lines to lose, can be with
The leakage current of high voltage side of transformer arrester is measured, is prevented thunder and lightning from puncturing and is burnt distribution transformer；And then make according to this
The anti-accident measures of distribution transformer neutral ground line failure, improve distribution system supply voltage qualification rate, prevent three-phase electricity
Pressure is uneven, and the electric equipment for causing burns, and reduces system active power loss.
The technical solution of the utility model is：
The utility model distribution transformer earthing impedance power loss measurement device includes：
220V/6V power voltage step down rectification modules, battery charging and voltage stabilizing module, transformer neutral conductor voltage analog treatment mould
Block, ADC analog-to-digital conversion modules one, central data processing module, transformer neutral current analog quantity processing module, ADC moduluses
Modular converter two, data memory module, display module, communication module；
The 220V/6V power voltage step downs rectification module connects central data processor module by battery charging and voltage stabilizing module
（Abbreviation CPU）For CPU powers；Transformer neutral conductor voltage analog processing module passes through ADC analog-to-digital conversion modules one, in connection
Centre data processing module, transformer neutral current analog quantity processing module is by ADC analog-to-digital conversion modules two, connection center number
According to processing module；Central data processor module, its output connect respectively data memory module, data disaply moudle and
Communication module；
The 220V/6V power voltage step downs rectification module can use rectifier bridge charge protection lithium battery, battery charging and voltage stabilizing mould
Block can use MP1482 power supply chips, and transformer neutral conductor voltage analog processing module can use LM-7012 analogue chips,
Central data processing module can use STM32F4 central data processors, and transformer neutral current analog quantity processing module can
Using LM-7012 analogue chips, ADC analog-to-digital conversion modules one, two can use 7606ADC analog-digital converters, data storage mould
Block can use AT24C data storages, and display module can be using common touch display screen, and communication module is using common RS485
Communication module；
The display screen shows real-time measuring data, and the data of central data processor are sent to 485 through 485 drivers
Communication interface, links Computer Storage historical measurement data, and finally by Mobile phone card, regularly transmission is real-time, store data into local
Net；
The utility model device is respectively equipped with panel, and be open current transformer current measurement data input port, surveys
Amount neutral point to big ground voltage N, L input terminal, data display screen, lithium cell charging interface, 485 data conversion storage interfaces etc..
Opening current transformer measuring transformer neutral point out-of-balance current, voltage measurement line measurement transformation are utilized when using
Device neutral ground line, 8 meters of magnitudes of voltage in addition greatly between ground.Using the out-of-balance current and transformer neutral point pair of transformer
8 meters of magnitudes of voltage in addition, calculate the earth resistance of the neutral point grounding electrode of transformer；
The system out-of-balance current value that is passed through by neutral point grounding electrode, to the magnitude of voltage between the earth, calculate and match somebody with somebody
Piezoelectric transformer neutral point grounding electrode active power loss.Adjustment three-phase load distribution.According to neutral resistance value, magnitude of voltage
Calculate the voltage influence to lightning arrestor movement.Measurement arrester ground line current measures the safe mass of arrester.
The beneficial effects of the utility model are：
By the utility model device, can meter calculate the impedance of transformer neutral point earthing pole corrosion resistance increase
Value, calculates the increase of transformer neutral point impedance ground, causes the active energy caused by 380V low-voltage distributing lines to lose, also
The leakage current of high voltage side of transformer arrester can be measured, is prevented thunder and lightning from puncturing and is burnt distribution transformer.Make according to this
The anti-accident measures of distribution transformer neutral ground line failure, improve distribution system supply voltage qualification rate, prevent three-phase electricity
Pressure is uneven, and the electric equipment for causing burns, and reduces system active power loss.
Current power system, factory electrician, conventional use of is all to utilize earthing megohm meter and pincerlike ground resistance measuring instrument,
Measure, these equipment can only all measure the D.C. resistance of ground wire.The resistance value measured cannot be used for being exchanged in operation
The calculating of circuit.Electric current in AC transformer neutral point, low-voltage distributing line multiple grounding line and over the ground electricity cannot be measured
Pressure value, it is impossible to calculating transformer ground wire, caused electric quantity loss.
The DC resistance under equal conditions measuring is not equal to AC impedance.
The utility model novel transformer grid grounding impedance measurement instrument, can accurately measure various equipment protection ground connection in operation
Current value in line, to 8 meters of magnitudes of voltage in addition greatly between ground.Accurately measure equipment ground line, transformer neutral point ground connection
Current value in line, in addition big to 8 meters magnitude of voltage, impedance ground value.Calculate transformer grounding pole generation impedance ground,
The active power loss for causing, and electricity, electricity charge loss, these all can be displayed on screen simultaneously.And history is measured storage
It is stored to memory chip.It is sent to regional network or dumps to computer.For management level provide equipment control foundation.
The utility model method measures certain city's cell 10kV distribution transformer in practice through overtesting
100kVA, the out-of-balance current in neutral ground line is 5 amperes, and to 8 meters, the voltage on ground is 40 volts greatly in addition.
40 volts of 5 amperes=8 ohm, 40 volts × 5 amperes=200 watts=0.2 kilowatt of ÷
0.6 yuan × 0.2 kilowatt × 24 hours × 30 days=86.4 yuans
The cell transformer neutral point impedance ground is 8 ohm, and neutral resistor consumes 200 watts of active power, daily 24
Hour, monthly 30 days, add up to and monthly lose 144 degree of electricity, lose 86.4 yuans of the electricity charge.
1st, cell transformer neutral point earth resistance is exceeded, take reduction earth resistance measure,
2nd, the distribution of cell electricity consumption three-phase load is unequal, answer Load adjustment to distribute,
3rd, after 2 measures of the above that takes measures, 86.4 yuans of the electricity charge can monthly be saved.
Some factories, the transformer capacity in market mostly in 200-500kVA or so, because transformer neutral point earthing pole connects
Ground resistance value is exceeded, and the electricity economic loss for causing is all very big.Current power supply unit, large electricity consumer few people's concern, measurement
This numerical value.Distribution system electricity is caused to damage increase.Measurement checks distribution transformer neutral point grounding electrode impedance, reduces transformer and connects
Earth polar impedance ground, improves the three-phase voltage degree of balance, improves safe power supply reliability.Effectively reduce distribution line kwh loss.
Improve economic results in society.
Brief description of the drawings
Fig. 1 is the connection principle of distribution transformer earthing impedance power loss measurement embodiment of the method described in the utility model
Schematic diagram；
Fig. 2 is the circuit theory frame of the utility model distribution transformer earthing impedance power loss measurement device embodiment
Figure.
In Fig. 1：1. distribution transformer, 2. arrester, 3. transformer neutral point ground wire, 4. opening current transformer, 5.
Transformer neutral point, 6. lightning protection pole, transformer grounding resistance power loss measurement apparatus, 7. interim measurement earthing pole.
Specific embodiment
As shown in Figure 1：For the utility model have been carried out example the impedance of 10kV distribution transformer high-pressure side arrester grounds,
Transformer 380V low-voltage distribution system neutral grounds impedance, the measuring method of active power loss, its method and step is：
（1）In 8 meters of big grounds remote in addition of distribution transformer neutral ground line, do a ground connection and well, be reliably grounded
Pole；And in measuring operation the distribution transformer neutral conductor to 8 meters of magnitudes of voltage in addition greatly between ground；
（2）Using opening current transformer, the current value in measurement distribution transformer neutral ground line；
（3）According to the transformer neutral conductor to the magnitude of voltage U between 8 meters of the earth in addition, and the transformer neutral conductor is produced
Current value I, calculates the earth resistance R of transformer neutral earthing pole；
（4）Using the current value I on the resistance value R and the neutral conductor of distribution transformer earthing pole, in calculating distribution transformer
Property the line earthing pole active power loss P, the P=UI that produce, loss electricity W=P × t；According to electric quantity loss, when calculating unit
Between electricity charge economic loss；
（5）When power, the measurement of voltage, electric current, earth resistance, the neutral point consumption above-mentioned measuring transformer neutral point
Between, year, month, day, hour, min, accumulated consumption power data conversion storage is to computer, or uploads to regional network；
Ground wire out-of-balance current according to transformer neutral point, adjusts Three-Phase Transformer sharing of load, in maintenance, replacing
Property point earthing pole, reduce distribution transformer neutral resistance, improve distribution system supply voltage qualification rate, keep three-phase electricity
Pressure balance movement.Reduction system active energy is lost.The leakage current of measuring transformer high-pressure side arrester ground line, formulates anti-
Accident measure, prevents surge arrester failure, loses the function of release overvoltage.
The utility model can also utilize opening current transformer, in measurement distribution transformer high-pressure side arrester ground line
Leakage current values, can interpolate that the quality of arrester, have leakage current produce just explanation arrester damage, without leakage electricity
Miscarriage is born with and illustrates that arrester is intact.
Method split shed current transformer described in the utility model can be using HG series Q50 types opening pincer Current Mutual Inductance
Device.
Utility model point of the present utility model is：Using the AC current values in collecting device ground wire, collection ground connection
Line calculates the power attenuation of ground wire to the magnitude of voltage of the earth.The method for calculating AC impedance.
Gather operating long range signals cable shield voltage-to-ground, the electric current that collection shielding line is produced, calculate letter
The method of number cable by external electromagnetic field interference strength.
The utility model measurement apparatus（See accompanying drawing 2）Including：
220V/6V power voltage step down rectification modules, battery charging and voltage stabilizing module, transformer neutral conductor voltage analog treatment mould
Block, ADC analog-to-digital conversion modules one, central data processing module, transformer neutral current analog quantity processing module, ADC moduluses
Modular converter two, data memory module, display module, communication module；
The 220V/6V power voltage step downs rectification module, central data processing module is connected by battery charging and voltage stabilizing module
（Abbreviation CPU）For CPU powers；Transformer neutral conductor voltage analog processing module passes through ADC analog-to-digital conversion modules one, in connection
Centre data processing module, transformer neutral current analog quantity processing module connects central number by ADC analog-to-digital conversion modules two
According to processing module；Central data processing module his output connects data memory module, touch display screen module, Yi Jitong respectively
News module；
The 220V/6V power voltage step downs rectification module can use rectifier bridge charge protection lithium battery, battery charging and voltage stabilizing mould
Block can use MP1482 power supply chips, and transformer neutral conductor voltage analog processing module can use LM-7012 analogue chips,
Central data processing module can use STM32F4 central data processors, and transformer neutral current analog quantity processing module can
Using LM-7012 analogue chips, ADC analog-to-digital conversion modules one, two can use 7606ADC analog-digital converters, data storage mould
Block can use AT24C data storages, and display module can be using common display screen, and communication module is using general RS485 communications
Module, such as MR-AI08L RS485 communication modules；
The display screen shows real-time measuring data, and the data of central data processor are sent to 485 through 485 drivers
Communication interface, links Computer Storage historical measurement data, and real time data to LAN is sent finally by Mobile phone card timing；
The utility model device is respectively equipped with opening current transformer current measurement data input port, measurement on panel
Neutral point to big ground voltage N, L input terminal, data display screen, lithium cell charging interface, 485 data conversion storage interfaces etc..
Opening current transformer measuring transformer neutral point out-of-balance current, voltage measurement line measurement transformation are utilized when using
Device neutral point is 8 meters of magnitudes of voltage in addition greatly between ground.Using the out-of-balance current and transformer neutral point of transformer to 8 meters in addition
Magnitude of voltage, calculate the earth resistance of the neutral point grounding electrode of transformer；
The current value that further passes through with neutral point grounding electrode, to the magnitude of voltage between the earth, calculate distribution change
Depressor neutral point grounding electrode active power loss.The electricity to lightning arrestor movement can also be calculated according to neutral resistance value
Pressure influence.
The utility model is hand-holdable when implementing or can be fixedly mounted in distribution transformer switch board, is matched somebody with somebody by measurement
Piezoelectric transformer neutral point connects out-of-balance current and to 8 meters of magnitudes of voltage in addition greatly between ground, calculates transformer neutral point ground connection
Resistance.According to neutral resistance value and to 8 meters of magnitudes of voltage greatly between ground in addition, caused by calculating transformer earth resistance
Active power loss.
According to the out-of-balance current of transformer and to the voltage change curve between the earth, taken a sample test every 1 hour and once become
Depressor out-of-balance current and to the magnitude of voltage between the earth, by Mobile phone card transformer neutral point earth resistance, having of producing
Work(power attenuation, per when, daily, active energy monthly, electricity charge loss be sent to the control data corporation of LAN,
Hand-held flow detection distribution transformer active power loss device：The uneven electricity of measuring transformer neutral ground line
Stream, and to 8 meters of magnitudes of voltage on ground greatly in addition, calculate the earth resistance of transformer neutral point, according to the voltage of measurement, electric current,
Grounding resistance, calculates the active energy loss of transformer neutral point earthing pole generation.
The grounding resistance measured by the utility model, calculates three-phrase burden balance degree, calculating transformer earthing pole work(
Rate is lost, and calculates the influence to lightning arrestor movement voltage.Formulate and improve specifically arranging for transformer neutral point earthing pole earth resistance
Apply.
The utility model method measures certain city's cell 10kV distribution transformer in practice through overtesting
100kVA, the out-of-balance current in neutral ground line is 5 amperes, and to 8 meters, the voltage on ground is 40 volts greatly in addition.
40 volts of 5 amperes=8 ohm, 40 volts × 5 amperes=200 watts=0.2 kilowatt of ÷
0.6 yuan × 0.2 kilowatt × 24 hours × 30 days=86.4 yuans
The cell transformer neutral point impedance ground is 8 ohm, and neutral resistor consumes 200 watts of active power, daily 24
Hour, monthly 30 days, add up to and monthly lose 144 degree of electricity, lose 86.4 yuans of the electricity charge.
1st, cell transformer neutral point earth resistance is exceeded, take reduction earth resistance measure,
2nd, the distribution of cell electricity consumption three-phase load is unequal, answer Load adjustment to distribute,
3rd, after 2 measures of the above that takes measures, 86.4 yuans of the electricity charge can monthly be saved.
Claims (3)
1. distribution transformer earthing impedance, power attenuation measurement apparatus, it is characterised in that：The device includes：
220V/6V power voltage step down rectification modules, battery charging and voltage stabilizing module, transformer neutral conductor voltage analog processing module,
ADC analog-to-digital conversion modules one, central data processing module, transformer neutral current analog quantity processing module, ADC analog-to-digital conversions
Module two, data memory module, display module, communication module；
The 220V/6V power voltage step downs rectification module connects central data processor module by battery charging and voltage stabilizing module（Letter
Claim CPU）For CPU powers；Transformer neutral conductor voltage analog processing module is by ADC analog-to-digital conversion modules one, connection center
Data processing module, transformer neutral current analog quantity processing module connects central data by ADC analog-to-digital conversion modules two
Processing module；Central data processor module, its output connects data memory module, data disaply moudle, Yi Jitong respectively
News module.
2. distribution transformer earthing impedance according to claim 1, power attenuation measurement apparatus, it is characterised in that：It is described
220V/6V power voltage step downs rectification module can use rectifier bridge charge protection lithium battery, and battery charging and voltage stabilizing module can be used
MP1482 power supply chips, transformer neutral conductor voltage analog processing module can use LM-7012 analogue chips, central data
Processing module can use LM- using STM32F4 central data processors, transformer neutral current analog quantity processing module
7012 analogue chips, ADC analog-to-digital conversion modules one, two be able to can be used using 7606ADC analog-digital converters, data memory module
AT24C data storages, display module can use common touch display screen, and communication module is communicated using common RS485.
3. distribution transformer earthing impedance according to claim 1, power attenuation measurement apparatus, it is characterised in that：The dress
Put and be respectively equipped with panel, be open current transformer current measurement data input port, measurement neutral point is to big ground voltage N, L
Input terminal, data display screen, lithium cell charging interface, 485 data conversion storage interfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621216284.9U CN206193104U (en) | 2016-11-11 | 2016-11-11 | Measurement device for distribution transformer earth impedance , power consumption |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621216284.9U CN206193104U (en) | 2016-11-11 | 2016-11-11 | Measurement device for distribution transformer earth impedance , power consumption |
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| Publication Number | Publication Date |
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| CN206193104U true CN206193104U (en) | 2017-05-24 |
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ID=58734076
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621216284.9U Active CN206193104U (en) | 2016-11-11 | 2016-11-11 | Measurement device for distribution transformer earth impedance , power consumption |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707030A (en) * | 2016-11-11 | 2017-05-24 | 高政 | Method and device for measuring grounding impedance and power loss of distribution transformer |
| CN109893763A (en) * | 2019-04-02 | 2019-06-18 | 杨永利 | A kind of device for alleviating hypertension and the portable instrument using the device |
-
2016
- 2016-11-11 CN CN201621216284.9U patent/CN206193104U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707030A (en) * | 2016-11-11 | 2017-05-24 | 高政 | Method and device for measuring grounding impedance and power loss of distribution transformer |
| CN106707030B (en) * | 2016-11-11 | 2023-06-06 | 高政 | Method and device for measuring ground impedance and power loss of distribution transformer |
| CN109893763A (en) * | 2019-04-02 | 2019-06-18 | 杨永利 | A kind of device for alleviating hypertension and the portable instrument using the device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190517 Address after: 071051 Building 201, No. 2A, 669 Yufeng Road, Gaokai District, Baoding City, Hebei Province Patentee after: Hebei Tianli Power Equipment Technology Co., Ltd. Address before: 071000 1-602, 10th floor, Gaokai District, Baoding City, Hebei Province Patentee before: Gao Zheng |
|
| TR01 | Transfer of patent right |