CN108333421A - High-tension cable overvoltage test device and its method - Google Patents
High-tension cable overvoltage test device and its method Download PDFInfo
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- CN108333421A CN108333421A CN201711260496.6A CN201711260496A CN108333421A CN 108333421 A CN108333421 A CN 108333421A CN 201711260496 A CN201711260496 A CN 201711260496A CN 108333421 A CN108333421 A CN 108333421A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
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- Testing Relating To Insulation (AREA)
Abstract
The present invention relates to a kind of high-tension cable overvoltage test devices, including standard capacitor, surveys and record the voltage survey record module of voltage waveform, handle voltage waveform and carry out the CPU of data calculating, control module, described standard capacitor one end is connected with the shielded layer of high-tension cable, one end is grounded, the high-pressure side of standard capacitor surveys record module with the voltage and connects, the voltage surveys record module and is connected with the CPU, and the CPU connects with the control module respectively.Capacitance and additional derided capacitors capacitive divider in series are had by oneself the present invention is based on cable to be divided.
Description
Technical field
The present invention relates to a kind of power system security research fields, test and lead more particularly, to a kind of high-tension cable overvoltage
Domain.
Background technology
Power cable compared with overhead transmission line, have be easy to laying, easy maintenance, excellent insulating property, occupation of land it is less and whole
The advantages that clean beautiful, therefore be used widely in urban distribution network.Cable is generally by conductor thread core, insulating layer, shielded layer, shield
The compositions such as jacket layer, armor, shielded layer passes through single-ended or two sides earth when operation.It, can be right when high-tension cable generates overvoltage
The insulation of cable and related electric equipment generate strong influence, and therefore, research and monitoring overvoltage become necessity.
Electric system mains voltage transformer measurement voltage signal at present, due to the presence of its electric electromagnetic unit, frequency is rung
Answer Property comparison poor, sample frequency can only measure conventional voltage signal between 1kHz-20kHz.And the mistake in electric system
Voltage type is various, producing cause and endanger it is also different, when there is Overvoltage, voltage signal often amplitude
Height, steepness is big, the duration is short, and conventional voltage mutual inductor cannot be satisfied the measurement request of transient overvoltage.
Publication No. CN201410361686 discloses a kind of electrical power system transient overvoltage acquisition system, the system packet
It includes：Condenser-type terminal, voltage sensor, secondary RC divider, sensor, amplifier, correcting circuit, wherein the capacitance
Formula casing, the voltage sensor, the secondary RC divider, the sensor, the amplifier, the liquid crystal display
It is sequentially connected, the correcting circuit output is connected to the secondary RC divider, the voltage letter of the voltage sensor output
Number it is transferred to the secondary RC divider, wherein the correcting circuit includes：Voltage-multiplying circuit and waveform adjustment circuit are realized
System can be calibrated, improve system reliability, voltage divider system is condenser-type terminal end shield voltage divider system.Its frequency is rung
Ying Hao, test error are small.
But the system must be used as level-one derided capacitors by the capacitance of condenser-type terminal, and power transmission and transformation system in addition to
Transformer or gas-insulated switch outgoing line side are just without casing, therefore that this method can not be on testing high voltage cable run is excessively electric
Pressure.
Invention content
The technical issues of being difficult to test present invention mainly solves the HV CABLE SYSTEM overvoltage present in the prior art, carries
Capacitance and additional derided capacitors capacitive divider in series being had by oneself based on cable come the high-tension cable mistake that is divided for a kind of
Voltage testing system and its method.
The above-mentioned technical problem of the present invention is mainly to be addressed by following technical proposals：A kind of high-tension cable is excessively electric
Compression testing device, including the voltage of standard capacitor, survey record voltage waveform survey record module, handle voltage waveform and carry out data meter
The CPU of calculation, control module, described standard capacitor one end are connected with the shielded layer of high-tension cable, one end ground connection, standard capacitance
The high-pressure side of device surveys record module with the voltage and connects, and the voltage surveys record module and is connected with the CPU, described
CPU connects with the control module respectively.The present invention is used for the cable of shielded layer single-end earthed.With standard capacitor and electricity
Cable has capacitance capacitive divider in series, the low-voltage arm by the capacitance of the standard capacitor as condenser divider by oneself
Capacitance C2, the high voltage arm capacitor C by capacitance in itself that contain between cable inner conductor and shielded layer as condenser divider1.By
It is enclosed construction in cable, therefore stray capacitance is substantially zeroed, and the C1 C2 that connect are approximately ideal capacitive divider structure.And it manages
Think that capacitive divider is all linear intrinsic standoff ratio in 50Hz to hundreds of MHz ranges, therefore the divider has good frequency domain special
Property and precision, disclosure satisfy that cable system over-voltage measurement requirement.The installation of the present invention is only needed the ground connection of cable shield
Point is unlocked, and after accessing the high-tension cable overvoltage test device, then high-tension cable overvoltage test device is grounded,
It is very convenient.The beginning of the present apparatus is controlled by control module, stops surveying record.Voltage surveys record module and surveys record standard capacitor both ends
Voltage waveform, CPU handles voltage waveform, data calculate, and obtains the transient voltage of high-tension cable.
Preferably, it is oscillograph that the voltage, which surveys record module, oscillograph accesses the side of the high-pressure side of standard capacitor
Formula is accessed using tap, and oscilloscope sampling rate is set as 80-120M/s, and waveform time axis is 80-120ms.Use oscillograph as electricity
Pressure surveys record module, you can constantly monitors the voltage in low-voltage arm, and can constantly show voltage waveform.
The present invention also provides a kind of test method of high-tension cable overvoltage test device, process includes：
A. high voltage arm capacitor C is calculated1：According to cable model, check that cable data table obtains capacitance per unit length C0, prediction shielding
The length L of the cable of layer single-end earthed, calculates cable capacitance CL= C0L, high voltage arm capacitor C1=CL；
B. selection low-voltage arm voltage U2Basic scope：To ensure that voltage surveys record module when measuring overvoltage without departing from range, look into
See that voltage surveys the maximum range U of record modulemax, select maximum range Umax'sAs low-voltage arm voltage U2Baseline values, n's
Value range is 5-10；
C. selection low-voltage arm capacitance C2：High-voltage arm voltage U1Phase voltage U when equal to cable normal operation0, low-voltage arm voltage, high voltage arm capacitor C1=CL, according to, calculate, according to the numerical value
Capacitor's capacity table is inquired, capacitance and the immediate standard capacitor of the numerical value are chosen, capacitance is low-voltage arm capacitance C2；
D., high-tension cable overvoltage test device is installed：The earth point of cable shield is unlocked, the high-tension cable is accessed
After overvoltage test device, then by high-tension cable overvoltage test device ground connection, installation is very convenient；
E. high-tension cable overvoltage test device is opened：Commencing signal is inputted in control module, control voltage is surveyed record module and opened
Begin to survey the voltage waveform for recording low-voltage arm；
F. it tests and records stable state power-frequency voltage U20：If the deviation of the maximum numerical value of continuous 5 waveforms is less than ± 5%, automatically
By waveform transfer to CPU, CPU carries out Fast Fourier Transform processing to waveform；If reference frequency is not 50Hz, aforementioned mistake is repeated
Journey；If reference frequency is 50Hz, automatically using this voltage as stable state power-frequency voltage U20It is transferred to voltage and surveys record module；
G. record low-voltage arm transient overvoltage U is surveyed2x：When voltage surveys the voltage value and stable state power-frequency voltage U that record module surveys record20Partially
Difference is more than ± 10%, recording voltage value U2x, and automatically by voltage value U2xIt is transmitted to CPU；
H. overvoltage U on cable is calculated and be shown1x：CPU calculates the overvoltage on cable, and numerical value is passed
Display module is transported to show.
The present invention also provides a kind of mode of priority, between g steps and h steps, the type for judging overvoltage,
CPU intercepts low-voltage arm transient overvoltage U2xWaveform rising edge T1If t2<T1<t3, then show that this voltage is switching overvoltage, t2
Value range 50-150us, t3Value range 800-1200us；If t0<T1<t1, then show that this voltage is Lightning Over-voltage,
t0Value range 0.2-0.6us, t1Value range 10-14us.
The advantageous effect that the present invention is brought is that the HV CABLE SYSTEM overvoltage solved present in the prior art is difficult to survey
The technical issues of examination, provides one kind and having capacitance and additional derided capacitors capacitive divider in series by oneself based on cable to carry out
The high-tension cable overvoltage of partial pressure tests system and method.
Therefore, the present invention is with the features such as reasonable for structure, easy to use.
Description of the drawings
Attached drawing 1 is a kind of circuit connection diagram of the present invention；
Attached drawing 2 is a kind of circuit diagram of the present invention；
Attached drawing 3 is a kind of test flow chart of the present invention.
Piece number explanation in figure：
（1）Shielded layer,（2）Cable inner conductor,（3）Standard capacitor,（4）Voltage survey record module,（5）CPU、（6）Control module.
Specific implementation mode
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
Embodiment 1：
As shown in Figure 1, 2, 3, the present invention is a kind of high-tension cable overvoltage test device, including standard capacitor（3）, survey record electricity
The voltage of corrugating surveys record module（4）, handle voltage waveform and carry out the CPU of data calculating（5）, control module（6）, described
Standard capacitor（3）The shielded layer of one end and high-tension cable（1）It is connected, one end ground connection, standard capacitor（3）High-pressure side and institute
The voltage stated surveys record module（4）Connect, the voltage surveys record module（4）With the CPU（5）It is connected, the CPU（5）
Respectively with the control module（6）Connect.The voltage surveys record module（4）For oscillograph, oscillograph accesses standard capacitance
Device（3）The mode of high-pressure side accessed using tap, oscilloscope sampling rate is set as 80-120M/s, and waveform time axis is 80-
120ms。
The present invention is used for shielded layer（1）On cable single-end earthed.Use standard capacitor（3）Capacitance series connection is had by oneself with cable
Capacitive divider is constituted, by the standard capacitor（3）Low-voltage arm capacitance C of the capacitance as condenser divider2, by electricity
Cable inner wire（2）With shielded layer（1）Between the high voltage arm capacitor C of the capacitance that contains as condenser divider in itself1.Due to electricity
Cable is enclosed construction, therefore stray capacitance is substantially zeroed, and C1 series connection C2 is approximately ideal capacitive divider structure.And desired electrical
Hold divider in 50Hz to hundreds of MHz ranges all be linear intrinsic standoff ratio, therefore the divider have good frequency domain characteristic with
Precision disclosure satisfy that cable system over-voltage measurement requirement.The installation of the present invention is only needed cable shield（1）Earth point
It unlocks, after accessing the high-tension cable overvoltage test device, then high-tension cable overvoltage test device is grounded, ten
It is convenient to divide.Pass through control module（6）It controls the beginning of the present apparatus, stop surveying record.Voltage surveys record module（4）Survey record standard capacitor
（3）The voltage waveform at both ends, CPU（5）Voltage waveform is handled, data calculating, obtains the transient voltage of high-tension cable.With
Oscillograph surveys record module as voltage（4）, you can the voltage in low-voltage arm is constantly monitored, and can constantly show voltage waveform.
The present invention also provides a kind of test method of high-tension cable overvoltage test device, process includes：
A. high voltage arm capacitor C is calculated1：According to cable model, check that cable data table obtains capacitance per unit length C0, prediction shielding
Layer（1）The length L of cable single-end earthed calculates cable capacitance CL= C0L, high voltage arm capacitor C1=CL；
B. selection low-voltage arm voltage U2Basic scope：To ensure that voltage surveys record module（4）When measuring overvoltage without departing from range,
Check that voltage surveys record module（4）Maximum range Umax, select maximum range Umax'sAs low-voltage arm voltage U2Basic number
The value range of value, n is 5-10；
C. selection low-voltage arm capacitance C2：High-voltage arm voltage U1Phase voltage U when equal to cable normal operation0, low-voltage arm voltage, high voltage arm capacitor C1=CL, according to, calculate, according to the numerical value
Capacitor's capacity table is inquired, capacitance and the immediate standard capacitor of the numerical value are chosen（3）, capacitance is low-voltage arm capacitance
C2；
D., high-tension cable overvoltage test device is installed：By cable shield（1）Earth point unlock, access the high-voltage electricity
After cable overvoltage test device, then by high-tension cable overvoltage test device ground connection, installation is very convenient；
E. high-tension cable overvoltage test device is opened：In control module（6）Upper input commencing signal, control voltage survey record module
（4）Start to survey the voltage waveform for recording low-voltage arm；
F. it tests and records stable state power-frequency voltage U20：If the deviation of the maximum numerical value of continuous 5 waveforms is less than ± 5%, automatically
By waveform transfer to CPU（5）, CPU（5）Fast Fourier Transform processing is carried out to waveform；If reference frequency is not 50Hz, repeat
Aforementioned process；If reference frequency is 50Hz, automatically using this voltage as stable state power-frequency voltage U20It is transferred to voltage and surveys record module
（4）；
G. record low-voltage arm transient overvoltage U is surveyed2x：When voltage surveys record module（4）Survey the voltage value and stable state power-frequency voltage U of record20
Deviation is more than ± 10%, recording voltage value U2x, and automatically by voltage value U2xIt is transmitted to CPU（5）；
h.CPU（5）Intercept low-voltage arm transient overvoltage U2xWaveform rising edge T1If t2<T1<t3, then show that this voltage is operation
Overvoltage, t2Value range 50-150us, t3Value range 800-1200us；If t0<T1<t1, then show that this voltage is thunder
Hit overvoltage, t0Value range 0.2-0.6us, t1Value range 10-14us；
I. overvoltage U on cable is calculated and be shown1x：CPU（5）Calculate the overvoltage on cable, and by numerical value
Display module is transmitted to show.
Embodiment 2：
As shown in Figure 1, 2, 3, the present invention is a kind of high-tension cable overvoltage test device, including standard capacitor（3）, survey record electricity
The voltage of corrugating surveys record module（4）, handle voltage waveform and carry out the CPU of data calculating（5）, control module（6）, described
Standard capacitor（3）The shielded layer of one end and high-tension cable（1）It is connected, one end ground connection, standard capacitor（3）High-pressure side and institute
The voltage stated surveys record module（4）Connect, the voltage surveys record module（4）With the CPU（5）It is connected, the CPU（5）
Respectively with the control module（6）Connect.The voltage surveys record module（4）For oscillograph, oscillograph accesses standard capacitance
Device（3）The mode of high-pressure side accessed using tap, oscilloscope sampling rate is set as 80-120M/s, and waveform time axis is 80-
120ms。
The present invention is used for shielded layer（1）On cable single-end earthed.Use standard capacitor（3）Capacitance series connection is had by oneself with cable
Capacitive divider is constituted, by the standard capacitor（3）Low-voltage arm capacitance C of the capacitance as condenser divider2, by electricity
Cable inner wire（2）With shielded layer（1）Between the high voltage arm capacitor C of the capacitance that contains as condenser divider in itself1.Due to electricity
Cable is enclosed construction, therefore stray capacitance is substantially zeroed, and C1 series connection C2 is approximately ideal capacitive divider structure.And desired electrical
Hold divider in 50Hz to hundreds of MHz ranges all be linear intrinsic standoff ratio, therefore the divider have good frequency domain characteristic with
Precision disclosure satisfy that cable system over-voltage measurement requirement.The installation of the present invention is only needed cable shield（1）Earth point
It unlocks, after accessing the high-tension cable overvoltage test device, then high-tension cable overvoltage test device is grounded, ten
It is convenient to divide.Pass through control module（6）It controls the beginning of the present apparatus, stop surveying record.Voltage surveys record module（4）Survey record standard capacitor
（3）The voltage waveform at both ends, CPU（5）Voltage waveform is handled, data calculating, obtains the transient voltage of high-tension cable.With
Oscillograph surveys record module as voltage（4）, you can the voltage in low-voltage arm is constantly monitored, and can constantly show voltage waveform.
The present invention also provides a kind of test method of high-tension cable overvoltage test device, process includes：
A. high voltage arm capacitor C is calculated1：According to cable model, check that cable data table obtains capacitance per unit length C0, prediction shielding
Layer（1）The length L of cable single-end earthed calculates cable capacitance CL= C0L, high voltage arm capacitor C1=CL；
B. selection low-voltage arm voltage U2Basic scope：To ensure that voltage surveys record module（4）When measuring overvoltage without departing from range,
Check that voltage surveys record module（4）Maximum range Umax, select maximum range Umax'sAs low-voltage arm voltage U2Basic number
The value range of value, n is 5-10；
C. selection low-voltage arm capacitance C2：High-voltage arm voltage U1Phase voltage U when equal to cable normal operation0, low-voltage arm voltage, high voltage arm capacitor C1=CL, according to, calculate, according to the numerical value
Capacitor's capacity table is inquired, capacitance and the immediate standard capacitor of the numerical value are chosen（3）, capacitance is low-voltage arm capacitance
C2；
D., high-tension cable overvoltage test device is installed：By cable shield（1）Earth point unlock, access the high-voltage electricity
After cable overvoltage test device, then by high-tension cable overvoltage test device ground connection, installation is very convenient；
E. high-tension cable overvoltage test device is opened：In control module（6）Upper input commencing signal, control voltage survey record module
（4）Start to survey the voltage waveform for recording low-voltage arm；
F. it tests and records stable state power-frequency voltage U20：If the deviation of the maximum numerical value of continuous 5 waveforms is less than ± 5%, automatically
By waveform transfer to CPU（5）, CPU（5）Fast Fourier Transform processing is carried out to waveform；If reference frequency is not 50Hz, repeat
Aforementioned process；If reference frequency is 50Hz, automatically using this voltage as stable state power-frequency voltage U20It is transferred to voltage and surveys record module
（4）；
G. record low-voltage arm transient overvoltage U is surveyed2x：When voltage surveys record module（4）Survey the voltage value and stable state power-frequency voltage U of record20
Deviation is more than ± 10%, recording voltage value U2x, and automatically by voltage value U2xIt is transmitted to CPU（5）；
H. overvoltage U on cable is calculated and be shown1x：CPU（5）Calculate the overvoltage on cable, and by numerical value
Display module is transmitted to show.
Claims (4)
1. a kind of high-tension cable overvoltage test device, it is characterised in that：Voltage including standard capacitor, survey record voltage waveform
Record module is surveyed, voltage waveform is handled and carries out the CPU of data calculating, control module, described standard capacitor one end and high pressure
The shielded layer of cable is connected, one end ground connection, and the high-pressure side of standard capacitor surveys record module with the voltage and connects, the electricity
Pressure surveys record module and is connected with the CPU, and the CPU connects with the control module respectively.
2. high-tension cable overvoltage test device according to claim 1, it is characterised in that：The voltage surveys record module
For oscillograph, the mode that oscillograph accesses the high-pressure side of standard capacitor is accessed using tap, and oscilloscope sampling rate is set as 80-
120M/s, waveform time axis are 80-120ms.
3. the test method of high-tension cable overvoltage test device described in claim 1, it is characterised in that：
Calculate high voltage arm capacitor C1：According to cable model, check that cable data table obtains capacitance per unit length C0, predict shielded layer
The length L of cable single-end earthed calculates cable capacitance CL= C0L, high voltage arm capacitor C1=CL；
Select low-voltage arm voltage U2Basic scope：Check that voltage surveys the maximum range U of record modulemax, select maximum range Umax's
As low-voltage arm voltage U2Baseline values, the value range of n is 5-10；
Select low-voltage arm capacitance C2：High-voltage arm voltage U1Phase voltage U when equal to cable normal operation0, low-voltage arm voltage
, high voltage arm capacitor C1=CL, according to, calculate, capacitance is inquired according to the numerical value
Capacitance table, chooses capacitance and the immediate standard capacitor of the numerical value, and capacitance is low-voltage arm capacitance C2；
High-tension cable overvoltage test device is installed：The earth point of cable shield is unlocked, the high-tension cable mistake is accessed
After voltage test device, high-tension cable overvoltage test device ground connection；
Open high-tension cable overvoltage test device：Commencing signal is inputted in control module, control voltage is surveyed record module and started
Survey the voltage waveform of record low-voltage arm；
It tests and records stable state power-frequency voltage U20：If the deviation of the maximum numerical value of continuous 5 waveforms is less than ± 5%, automatically by wave
Shape is transferred to CPU, and CPU carries out Fast Fourier Transform processing to waveform；If reference frequency is not 50Hz, aforementioned process is repeated；
If reference frequency is 50Hz, automatically using this voltage as stable state power-frequency voltage U20It is transferred to voltage and surveys record module；
Survey record low-voltage arm transient overvoltage U2x：When voltage surveys the voltage value and stable state power-frequency voltage U that record module surveys record20Deviation is super
± 10% is crossed, recording voltage value U2x, and automatically by voltage value U2xIt is transmitted to CPU；
Overvoltage U on cable is calculated and be shown1x：CPU calculates the overvoltage on cable, and show mistake on cable
Voltage U1x。
4. the test method of high-tension cable overvoltage test device according to claim 3 has between g steps and h steps
One priority service, it is characterised in that：CPU intercepts low-voltage arm transient overvoltage U2xWaveform rising edge T1If t2<T1<t3, then show
Show that this voltage is switching overvoltage, t2Value range 50-150us, t3Value range 800-1200us；If t0<T1<t1, then
Show that this voltage is Lightning Over-voltage, t0Value range 0.2-0.6us, t1Value range 10-14us.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711260496.6A CN108333421A (en) | 2017-12-04 | 2017-12-04 | High-tension cable overvoltage test device and its method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711260496.6A CN108333421A (en) | 2017-12-04 | 2017-12-04 | High-tension cable overvoltage test device and its method |
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| Publication Number | Publication Date |
|---|---|
| CN108333421A true CN108333421A (en) | 2018-07-27 |
Family
ID=62923211
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|---|---|---|---|
| CN201711260496.6A Pending CN108333421A (en) | 2017-12-04 | 2017-12-04 | High-tension cable overvoltage test device and its method |
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Cited By (1)
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| CN112924746A (en) * | 2021-01-29 | 2021-06-08 | 国网宁夏电力有限公司银川供电公司 | Device and method for measuring phase voltage of high-voltage cable terminal head |
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