CN109100611A - A kind of system and method for phase-control type arc suppression coil measurement 35KV distribution network capacitance current test - Google Patents
A kind of system and method for phase-control type arc suppression coil measurement 35KV distribution network capacitance current test Download PDFInfo
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- CN109100611A CN109100611A CN201810853410.9A CN201810853410A CN109100611A CN 109100611 A CN109100611 A CN 109100611A CN 201810853410 A CN201810853410 A CN 201810853410A CN 109100611 A CN109100611 A CN 109100611A
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
Abstract
The invention discloses a kind of systems of phase-control type arc suppression coil measurement 35KV distribution network capacitance current test, including phase-control type arc suppression coil, on-site control, microcomputerized controller, single-phase potential transformer, single-phase current transformer and single-pole isolator, phase-control type arc suppression coil includes first winding and secondary winding, and on-site control includes power frequency component injection device；Single-pole isolator one end is electrically connected 35KV distribution network systems neutral point, the other end is electrically connected with first winding one end in phase-control type arc suppression coil, the present invention also provides the methods using the systematic survey distribution network capacitance current test, present system and method are still able to achieve the precise measurement of electric network capacitance and current in distribution network systems asymmetrical voltage very little, it is convenient to realize, low in cost, and controllability is high, high reliablity will not have an impact the work of power grid.
Description
Technical field
The present invention relates to power system and automation technologies, measure more particularly to a kind of phase-control type arc suppression coil
The system and method for 35KV distribution network capacitance current test.
Background technique
In 35kV distribution network systems, being provided according to regulation, system capacitive current should install arc suppression coil when being more than 10A, with
Inhibit the arc overvoltage generated when single-phase earthing, avoids single-phase fault from developing into phase fault, cause switch trip.State at present
Interior arc suppression coil mainly has turn-adjusting, phase control type, three kinds of capacitor tuning type, and wherein phase-control type arc suppression coil is continuous because having compensation electric current
The advantages that stepless adjustable, response is rapidly, structure is simple, convenient for installation and maintenance, so using more and more extensive.
The neutral point of 35kV distribution network systems has usually been drawn, and arc suppression coil can directly connect on the neutral point of system, nothing
Grounding transformer need to be used.It is not right due to distribution network systems neutral point to the phase-control type arc suppression coil for 35kV distribution network systems
Claim the usual very little of voltage, according to conventional electric network capacitance and current measurement method, measurement error is very big sometimes, sometimes even can not
It measures, to affect the normal work of phase-control type arc suppression coil.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of phase-control type arc suppression coil measurement 35kV distribution network capacitance current test
System and method-power-frequency voltage signal injection method, present system and method in distribution network systems asymmetrical voltage very little still
It is able to achieve the precise measurement of distribution network capacitance current test, while this method realizes that conveniently low in cost, high reliablity will not be to distribution
Work have an impact.
One technical scheme adopted by the invention is that: a kind of phase-control type arc suppression coil measurement 35KV distribution network capacitance current test is provided
System, including phase-control type arc suppression coil, phase-control type arc suppression coil includes first winding and secondary winding, and secondary winding includes control
Winding processed and Filter Winding, 35KV distribution network systems neutral point are connected with first winding and neutral point single-phase current transformer respectively,
First winding passes through neutral ground, and single-phase potential transformer is in parallel with phase-control type arc suppression coil；
Secondary winding is electrically connected with on-site control, includes the first power bi-directional thyristor and filter in on-site control
Group, the first power bi-directional thyristor are electrically connected with control winding, and filter group is electrically connected with Filter Winding, is set in on-site control
There is a signal injection device, signal injection device is in parallel with filter group, and signal injection device includes that miniature phase buck becomes
Depressor, the second power bi-directional thyristor and resistor, miniature single phase step-down transformer first winding are electrically connected 220V AC power frequency
Power supply, miniature single phase step-down transformer secondary winding are connected the second power bi-directional thyristor and resistor respectively；
Single-phase current transformer one end and single-phase potential transformer one end are connected separately microcomputerized controller, on-site control with
The connection of microcomputerized controller signal, microcomputerized controller controls the first power bi-directional thyristor respectively and the second power bi-directional thyristor is led
Logical, microcomputerized controller distinguishes acquisition process single-phase current transformer and single-phase potential transformer data；
When the second power bi-directional thyristor does not turn on, single-phase potential transformer measures system neutral asymmetrical voltage
Ubd, after microcomputerized controller controls the second power bi-directional turn on thyristors, power-frequency voltage signal is injected into 35KV distribution network systems, is surveyed
Obtain single-phase potential transformer output voltage UAX, single-phase current transformer output electric current IZ, system nominal phase voltage is Ue, pass through
Ubd、UAX、IZ、UeObtain distribution network systems capacitance current IC。
As a preferred embodiment, calculation is specific as follows:
The equivalent circuit of system corresponds to vector correlation are as follows:
AX = bd + C
It can be derived that: U2 C= U2 AX + U2 bd - 2 UAX UbdCOSθ
The calculating formula of the 35KV distribution network capacitance current test are as follows:
XC = UC / Iz
IC = Ue / XC。
A kind of method of phase-control type arc suppression coil measurement 35KV distribution network capacitance current test, specifically includes the following steps:
Step 1: measuring the asymmetrical voltage of 35KV distribution network systems neutral point bd；
Step 2: power-frequency voltage signal is injected into 35KV distribution network systems, measures output voltage at this time respectively AX, output is electric at this time
Flow Iz；
Step 3: system nominal phase voltage is Ue, pass through Ubd、UAX、IZ、UeDistribution network systems capacitance current I is calculatedC。
As a preferred embodiment, calculation is specific as follows:
The equivalent circuit of system corresponds to vector correlation are as follows:
AX = bd + C
It can be derived that: U2 C= U2 AX + U2 bd - 2 UAX UbdCOSθ
The calculating formula of the 35KV distribution network capacitance current test are as follows:
XC = UC / Iz
IC = Ue / XC。
The beneficial effects of the present invention are: being still able to achieve the essence of electric network capacitance and current in distribution network systems asymmetrical voltage very little
Really measurement, while this method realizes that conveniently, low in cost, high reliablity will not have an impact the work of power grid.
Detailed description of the invention
Fig. 1 is the connection principle of the system of phase-control type arc suppression coil of embodiment of the present invention measurement 35KV distribution network capacitance current test
Figure.
Fig. 2 is power frequency component injection device elementary diagram of the embodiment of the present invention.
Fig. 3 is equivalent circuit schematic of the system of the embodiment of the present invention when measuring 35KV distribution network capacitance current test.
Fig. 4 is vector correlation figure corresponding with Fig. 3 of the embodiment of the present invention.
Appended drawing reference:
1- phase-control type arc suppression coil, 2- on-site control, 3- microcomputerized controller, 4- single-phase potential transformer, 5- monophase current are mutual
Sensor, 6- signal injection device, 7- single-pole isolator, the miniature single phase step-down transformer of 8-, 9- the second power bi-directional thyristor,
10- resistor, 11-a1x1 control windings, 12-a2x2 Filter Windings.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that the described embodiments are merely a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment 1:
Referring to attached Fig. 1 and 2, the invention discloses a kind of system of phase-control type arc suppression coil measurement 35KV distribution network capacitance current test, packets
Phase-control type arc suppression coil 1 is included, phase-control type arc suppression coil 1 includes first winding and secondary winding, and secondary winding includes control winding
11 and Filter Winding 12,35KV distribution network systems neutral point connect respectively with first winding and neutral point single-phase current transformer 5, one
Secondary winding passes through neutral ground, and single-phase potential transformer 4 is in parallel with phase-control type arc suppression coil 1；
Secondary winding is electrically connected with on-site control 2, includes the first power bi-directional thyristor and filter in on-site control 2
Group, the first power bi-directional thyristor are electrically connected with control winding, and filter group is electrically connected with Filter Winding 12, on-site control 2
It is inside equipped with a signal injection device 6, signal injection device 6 is in parallel with filter group, and signal injection device 6 includes miniature single-phase
Step-down transformer 8, the second power bi-directional thyristor 7 and resistor 10, miniature 8 first winding of single phase step-down transformer electrical connection
220V AC power frequency supply, miniature 8 secondary winding of single phase step-down transformer are connected the second power bi-directional thyristor 9 and resistance respectively
Device 10；
5 one end of single-phase current transformer and 4 one end of single-phase potential transformer are connected separately microcomputerized controller 3, control on the spot
Cabinet 2 is connect with 3 signal of microcomputerized controller, and microcomputerized controller 3 controls the first power bi-directional thyristor and the second power bi-directional respectively
Thyristor 9 is connected, and microcomputerized controller 3 acquires 4 data of single-phase current transformer 5 and single-phase potential transformer respectively；
When the second power bi-directional thyristor 9 does not turn on, single-phase potential transformer 4 measures system neutral asymmetrical voltage
Ubd, after microcomputerized controller 3 controls the conducting of the second power bi-directional thyristor 9, power-frequency voltage signal is injected into 35KV distribution network systems,
Measure 4 output voltage U of single-phase potential transformerAX, the output of single-phase current transformer 5 electric current IZ, system nominal phase voltage is Ue, lead to
Cross Ubd、UAX、IZ、UeObtain distribution network systems capacitance current IC。
Embodiment 2:
On the basis of embodiment 1, microcomputerized controller 3 includes connecting with single-phase potential transformer 4 and single-phase current transformer 5
And the signal conditioner for signal will be collected improving, the A/D of analog-to-digital conversion is connect and carried out to signal with signal conditioner
Converter, connect and to the processor that the number after conversion is handled with A/D converter, processor connection and to the of sending
One bidirectional thyristor and the second bidirectional thyristor action command carry out the photoisolator of Phototube Coupling processing, at Phototube Coupling
The order of acting as the host of the bidirectional thyristor of reason acts the first bidirectional thyristor and the second bidirectional thyristor；Processor is also connected with liquid crystal
Display and keyboard operation module.
Embodiment 3:
Referring to attached drawing 3 and 4, based on providing on the basis of embodiment 1, a kind of phase-control type arc suppression coil measurement 35KV distribution capacitor is electric
The method of stream, specifically includes the following steps:
Step 1: measuring the asymmetrical voltage of 35KV distribution network systems neutral point bd；
Step 2: power-frequency voltage signal is injected into 35KV distribution network systems, measures output voltage at this time respectively AX, output is electric at this time
Flow Iz；
Step 3: system nominal phase voltage is Ue, pass through Ubd、UAX、IZ、UeDistribution network systems capacitance current I is calculatedC。
Calculation is specific as follows:
The equivalent circuit of system corresponds to vector correlation are as follows:
AX = bd + C
It according to the cosine law, can be derived that: U2 C= U2 AX + U2 bd - 2 UAX UbdCOSθ
The calculating formula of the 35KV distribution network capacitance current test are as follows:
XC = UC / Iz
IC = Ue / XC。
Attached drawing 3 is equivalent schematic diagram when measuring capacitance current, X in figureLFor the equivalent of phase-control type arc suppression coil primary side
Reactance, C ' are that filter circuit is converted to primary side equivalent capacity, and C is system direct-to-ground capacitance；UbdFor system asymmetrical voltage, Iz is
Primary circuit electric current；Attached drawing 4 is the corresponding vector correlation of attached drawing 3.
The course of work of the present invention is as follows: the first winding of phase-control type arc suppression coil is neutral as Working winding access power distribution network
Point, control winding 11 are electrically connected the first bidirectional thyristor, and the angle of flow for adjusting the first bidirectional thyristor has to be changed between 0 ~ 180 °,
Change the equivalent impedance of the first bidirectional thyristor between infinity to zero, the compensation electric current of output can be zero to rated value
Between obtain continuous electrodeless adjustment.Filter Winding 12 is devised simultaneously eliminates the harmonic wave generated when the conducting of the first bidirectional thyristor,
Output electric current is set to remain power current；When the second power bi-directional thyristor 9 does not turn on, single-phase potential transformer 4 is surveyed
System neutral asymmetrical voltage U outbd, after microcomputerized controller 3 controls the conducting of the second power bi-directional thyristor 9, measure single-phase electricity
Press 4 output voltage U of mutual inductorAX, the mutual 5 sensor output electric current I of monophase currentZ, system nominal phase voltage is Ue, pass through Ubd、UAX、
IZ、UeDistribution network systems capacitance current I is obtained according to corresponding calculation formulaC。
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (4)
1. a kind of system of phase-control type arc suppression coil measurement 35KV distribution network capacitance current test, which is characterized in that including phase control type extinguishing arc
Coil (1), phase-control type arc suppression coil (1) include first winding and secondary winding, and secondary winding includes control winding (11) and filter
Wave winding (12), 35KV distribution network systems neutral point are connected with first winding and neutral point single-phase current transformer (5) respectively, once
Winding passes through neutral ground, and single-phase potential transformer (4) is in parallel with phase-control type arc suppression coil (1)；
Secondary winding is electrically connected with on-site control (2), includes the first power bi-directional thyristor and filter in on-site control (2)
Wave device group, the first power bi-directional thyristor are electrically connected with control winding, and filter group is electrically connected with Filter Winding (12), is controlled on the spot
A signal injection device (6) is equipped in cabinet (2) processed, signal injection device (6) is in parallel with filter group, signal injection device
It (6) include miniature single phase step-down transformer (8), the second power bi-directional thyristor (9) and resistor (10), miniature phase buck becomes
Depressor (8) first winding is electrically connected 220V AC power frequency supply, and miniature single phase step-down transformer (8) secondary winding connects the respectively
Two power bi-directional thyristors (9) and resistor (10)；
Single-phase current transformer (5) one end and single-phase potential transformer (4) one end are connected separately microcomputerized controller (3), just
Ground control cabinet (2) is connect with microcomputerized controller (3) signal, microcomputerized controller (3) control respectively the first power bi-directional thyristor and
The conducting of second power bi-directional thyristor (9), microcomputerized controller (3) difference acquisition process single-phase current transformer (5) and single-phase electricity
Press mutual inductor (4) data；
When the second power bi-directional thyristor (9) does not turn on, single-phase potential transformer (4) measures system neutral asymmetry
Voltage Ubd, after microcomputerized controller (3) controls the conducting of the second power bi-directional thyristor (9), power-frequency voltage signal is injected into 35KV and matches
In net system, single-phase potential transformer (4) output voltage U is measuredAX, single-phase current transformer (5) output electric current IZ, system nominal
Phase voltage is Ue, pass through Ubd、UAX、IZ、UeObtain distribution network systems capacitance current IC。
2. the system of phase-control type arc suppression coil measurement 35KV distribution network capacitance current test as described in claim 1, which is characterized in that meter
Calculation mode is specific as follows:
The equivalent circuit of system corresponds to vector correlation are as follows:
AX = bd + C
It can be derived that: U2 C= U2 AX + U2 bd - 2 UAX UbdCOSθ
The calculating formula of the 35KV distribution network capacitance current test are as follows:
XC = UC / Iz
IC = Ue / XC。
3. a kind of method of phase-control type arc suppression coil measurement 35KV distribution network capacitance current test, this method is based on described in claim 1
A kind of system of phase-control type arc suppression coil measurement 35KV distribution network capacitance current test, which is characterized in that specifically includes the following steps:
Step 1: measuring the asymmetrical voltage of 35KV distribution network systems neutral point bd；
Step 2: power-frequency voltage signal is injected into 35KV distribution network systems, measures output voltage at this time respectively AX, output is electric at this time
Flow Iz；
Step 3: system nominal phase voltage is Ue, pass through Ubd、UAX、IZ、UeDistribution network systems capacitance current I is calculatedC。
4. the method for phase-control type arc suppression coil measurement 35KV distribution network capacitance current test as claimed in claim 3, which is characterized in that meter
Calculation mode is specific as follows:
The equivalent circuit of system corresponds to vector correlation are as follows:
AX = bd + C
It can be derived that: U2 C= U2 AX + U2 bd - 2 UAX UbdCOSθ
The calculating formula of the 35KV distribution network capacitance current test are as follows:
XC = UC / Iz
IC = Ue / XC。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810853410.9A CN109100611B (en) | 2018-07-30 | 2018-07-30 | Method for measuring 35KV distribution network capacitance current by phase control type arc suppression coil |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810853410.9A CN109100611B (en) | 2018-07-30 | 2018-07-30 | Method for measuring 35KV distribution network capacitance current by phase control type arc suppression coil |
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| CN109100611A true CN109100611A (en) | 2018-12-28 |
| CN109100611B CN109100611B (en) | 2020-04-21 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110470899A (en) * | 2019-07-03 | 2019-11-19 | 中山职业技术学院 | A kind of capacitance current of distribution network measurement method based on subordinating degree function |
| CN110535116A (en) * | 2019-09-10 | 2019-12-03 | 北京华电瑞通电力工程技术有限公司 | A kind of arc extinction cabinet and small current neutral grounding system |
| CN113219377A (en) * | 2021-04-30 | 2021-08-06 | 西安热工研究院有限公司 | Generator primary loop checking method based on injection type stator grounding protection device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201204451Y (en) * | 2008-07-01 | 2009-03-04 | 乐山一拉得电网自动化有限公司 | Intelligent arc-suppression coil plant |
| CN206931998U (en) * | 2017-04-28 | 2018-01-26 | 乐山一拉得电网自动化有限公司 | A kind of blowout coil set apparatus |
-
2018
- 2018-07-30 CN CN201810853410.9A patent/CN109100611B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201204451Y (en) * | 2008-07-01 | 2009-03-04 | 乐山一拉得电网自动化有限公司 | Intelligent arc-suppression coil plant |
| CN206931998U (en) * | 2017-04-28 | 2018-01-26 | 乐山一拉得电网自动化有限公司 | A kind of blowout coil set apparatus |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110470899A (en) * | 2019-07-03 | 2019-11-19 | 中山职业技术学院 | A kind of capacitance current of distribution network measurement method based on subordinating degree function |
| CN110470899B (en) * | 2019-07-03 | 2021-08-27 | 中山职业技术学院 | Method for measuring capacitance current of power distribution network based on membership function |
| CN110535116A (en) * | 2019-09-10 | 2019-12-03 | 北京华电瑞通电力工程技术有限公司 | A kind of arc extinction cabinet and small current neutral grounding system |
| CN113219377A (en) * | 2021-04-30 | 2021-08-06 | 西安热工研究院有限公司 | Generator primary loop checking method based on injection type stator grounding protection device |
| CN113219377B (en) * | 2021-04-30 | 2024-02-02 | 西安热工研究院有限公司 | Generator primary loop inspection method based on injection type stator grounding protection device |
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