CN101907651B - Main circuit current measuring device for high-voltage DC transmission converter valve - Google Patents
Main circuit current measuring device for high-voltage DC transmission converter valve Download PDFInfo
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- CN101907651B CN101907651B CN201010214584.4A CN201010214584A CN101907651B CN 101907651 B CN101907651 B CN 101907651B CN 201010214584 A CN201010214584 A CN 201010214584A CN 101907651 B CN101907651 B CN 101907651B
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Abstract
The invention relates to a main circuit current measuring device for a high-voltage DC transmission converter valve, which is arranged on a rectangular copper bar of a main circuit in a converter valve layer. The measuring device comprises a shielding case which is formed by butt joint of a shielding case I and a shielding case II, wherein the shielding case I is internally equipped with a magnetic core I winding a coil I, and the shielding case II is internally equipped with a magnetic core II winding a coil II, an integrating circuit and a voltage divider; an input terminal of the integrating circuit and the shielding case II are connected with the coil II, and an output terminal of the integrating circuit is connected with the voltage divider; and an output terminal of the voltage divider outputs a measuring signal. The current measuring device has the advantages of good shielding property, small volume, good linearity, high reliability, good stability, small influence for field intensity distribution in the converter valve and the like; and measuring range of the device is +/-10kA, frequency band is 40Hz-6MHz, sensitivity is 150mV/kA and maximum error is 1.22%.
Description
Technical field
The invention belongs to measurement technical field of measurement and test, relate in particular to a kind of main circuit current measuring device for high-voltage DC transmission converter valve.
Background technology
HVDC converter valve belongs to hoisting structure, when carrying out the tests such as excess current, superpotential, triggering non-periodic, in major loop, can flow through heavy impulse current, at present, the method of determining this electric current is only confined to simulation calculation, but in test, converter valve is positioned at noble potential, its electromagnetic environment of living in is very severe, and go here and there in each valve layer and have nonlinear devices such as reactor, capacitor, between being subject to layer by layer, the stray capacitance of layer between ground, the impact of inductance, so there is larger error in simulation calculation, can not meet the actual needs of engineering.In process of the test, in converter valve major loop, by the excess current that flows through thousands of amperes, when so large electric current is flowed through thyristor, may burn thyristor, have great potential safety hazard.Therefore, in the urgent need to inserting the main circuit current measuring device in converter valve layer, yet the measurement mechanism in this application is still blank both at home and abroad.
Summary of the invention
The technical problem to be solved in the present invention is to provide the main circuit current measuring device for high-voltage DC transmission converter valve that a kind of volume is little, measurement range is wide, error is little, highly sensitive, reliable and stable.
For solving the problems of the technologies described above, the present invention proposes a kind of main circuit current measuring device for high-voltage DC transmission converter valve, it is arranged in the major loop rectangular copper bar in converter valve layer, this measurement mechanism comprises the shielding case being formed by shielding case I and shielding case II docking, in described shielding case I, be provided with the magnetic core I that is being wound around coil I, in described shielding case II, be provided with the magnetic core II that is being wound around coil II, integrating circuit and voltage divider, described integrating circuit input end is all connected with coil II with shielding case II, described integrating circuit output terminal connects voltage divider, described voltage divider output terminal is exported measuring-signal.
Wherein, described magnetic core I and magnetic core II all adopt U-iron ferrite core, in described shielding case I, be provided with the magnetic core fixing device I that magnetic core I is fixed, in shielding case II, be provided with the magnetic core fixing device I I that magnetic core II is fixed, after described magnetic core I docks with magnetic core II, form a toroidal core.
Wherein, be provided with fastening plug-in unit in described shielding case, described coil I is connected with fastening plug-in unit respectively with coil II.
Wherein, described magnetic core fixing device I and magnetic core fixing device I I are the ring texture that insulating material is made, and it is inner that described magnetic core fixing device I is adhered to shielding case I by insulating gel, and described magnetic core fixing device I I is bonding inner with shielding case II by insulating gel.
Wherein, described shielding case I and shielding case II all adopt U-shaped structure, after the openend docking of described shielding case I and shielding case II, by external fastening, are fixed into a ring shielding shell.
Wherein, the interior ring center line of described shielding case is provided with slot, embeds the insulation cover pad being useful on testee insulation isolation in described slot.
Wherein, described shielding case I and shielding case II inside are provided with the insulating supporting for fixed magnetic core I and magnetic core II.
Wherein, the coil I number of turn of the upper coiling of described magnetic core I is 34 circles, and the coil II number of turn of the upper coiling of described magnetic core II is 26 circles, and the turn-to-turn distance of described coil I and coil II is 8mm.
Wherein, described integrating circuit consists of 10 resistance in parallel.
Wherein, described voltage divider consists of the resistance of two series connection, and one of them resistance is connected with integrating circuit as high-voltage arm, and another resistance is connected with shielding case II as low-voltage arm.
Wherein, the diameter of section of described magnetic core I and magnetic core II is 15.5mm, and the shell of described shielding case I and shielding case II is thick is 3mm, and the width of described slot is 2mm, the thickness of described insulation cover pad is 3mm, and the spacing of the spacing of described coil I and shielding case I and described coil II and shielding case II is 5mm.
Beneficial effect of the present invention is:
1) high, the good stability of the reliability of this measurement mechanism, can reach ± 10kA of measurement range, and possess the good linearity;
2) this measurement mechanism frequency band can reach 40Hz～6MHz, and low-and high-frequency is corresponding good, and measuring maximum error is only 1.22%, is far smaller than 3% of high-tension measurement standard-required;
3) this measurement mechanism housing shroud performance is good, because the slot at interior ring center line is embedded in insulation cover pad, makes measurement mechanism and circuit-under-test not only without electrical connection but also can close contact, safe and reliable;
4) inner core of this measurement mechanism and exterior shield shell all adopt the loop configuration that two U-shaped member docking form, there is volume little, lightweight advantage, this measurement mechanism is nested in the major loop rectangular copper bar in converter valve layer by fastening plug-in unit, easy for installation, simple to operate.
Accompanying drawing explanation
Fig. 1 is from integration type Rogowski coil equivalent circuit diagram;
Fig. 2 is the installation site schematic diagram of current measuring device of the present invention;
Fig. 3 is the outside drawing of current measuring device of the present invention;
Fig. 4 is the inner structure schematic diagram of current measuring device of the present invention, the i.e. longitudinal sectional view of current measuring device;
Wherein, 1-shielding case, 1a-shielding case I, 1b-shielding case II, 2a-magnetic core I, 2b-magnetic core II, 3-integrating circuit, 4-voltage divider, 4a-high-voltage arm, 4b-low-voltage arm, 5a-coil I, 5b-coil II, 6a-magnetic core fixing device I, 6b-magnetic core fixing device I I, the fastening plug-in unit of 7-, 7a-slot, 7b-contact pin, 8-external fastening, 9-slot, 10-insulating supporting, 11-spring, 12-end cap, 13-voltage divider output terminal, 14-copper sheet.
Embodiment
Below in conjunction with accompanying drawing, current measuring device of the present invention is further described in detail.
Main circuit current measuring device of the present invention adopts from integration type Rogowski coil principle, its equivalent electrical circuit as shown in Figure 1, coiling L on the skeleton around tested electric current
0, coil two ends can induce the induced potential e (t) being directly proportional to the derivative di/dt of tested electric current, and induced potential is by coil L
0the integrating circuit R that two ends connect
rinstitute's integration, integrating circuit R
rthe voltage waveform U at two ends
out(t) consistent with the waveform of tested electric current.Described C
0for coil L
0and the electric capacity producing between shielding case, described R
0for coil L
0and the resistance producing between shielding case.
As shown in Figure 2, current measuring device of the present invention is arranged in the major loop rectangular copper bar in converter valve layer, so configuration design becomes counterpart formula structure, and this structural volume is little, easy for installation.
As shown in Figure 3,4, this current measuring device mainly comprises A, B two parts:
A part mainly comprises U-shaped shielding case I 1a and U-shaped magnetic core I 2a.Symmetrical two magnetic core fixing device I 6a and two insulating supportings 10 that are useful on fixed magnetic core I 2a in shielding case I 1a, magnetic core fixing device I 6a and insulating supporting 10 are adhered in shielding case I1a by insulating gel, before magnetic core fixing device I 6a, be arranged side by side a fastening plug-in unit 7, fastening plug-in unit is comprised of contact pin 7a and slot 7b, and in this example, the contact pin 7a of fastening plug-in unit is adhered in shielding case I 1a by insulating gel; With the winding of a copper enameled wire, on magnetic core I 2a, the coil I 5a being wound around on magnetic core I 2a after coiling is uniformly distributed.Open the end cap 12 in shielding case I left side, the magnetic core I that is wound with coil I is stretched in shielding case I, and two long limits of this magnetic core I are passed to insulating supporting 10 and magnetic core fixing device I 6a successively, by two coil I joints of copper enameled wire head and the tail respectively be bonded in shielding case I in two contact pin 7a be connected, then by 12 sealings of the end cap in shielding case I left side.
B part mainly comprises U-shaped shielding case II 1b, U-shaped magnetic core II 2b, integrating circuit 3 and voltage divider 4.Symmetrical two magnetic core fixing device I I 6b and two insulating supportings 10 that are useful on fixed magnetic core I 2a in shielding case II 1b, magnetic core fixing device I I 6b and insulating supporting 10 by insulating gel bonding with shielding case II 1b in, in this example, the slot 7b of fastening plug-in unit is adhered in shielding case II 1b by insulating gel; With the symmetrical winding of two copper enameled wires, on magnetic core II 2b, the coil II 5b being wound around on magnetic core II 2b after coiling is uniformly distributed.Open the end cap 12 on shielding case II right side, the magnetic core II that is wound with coil II is stretched in shielding case II, and two long limits of this magnetic core II are passed to insulating supporting 10 and magnetic core fixing device I I 6b successively, two coil II joints of two copper enameled wire head ends are connected with two slot 7b respectively, again two coil II joints of two copper enameled wire ends are connected with shielding case II with integrating circuit input end respectively, integrating circuit output terminal connects the high-voltage arm 4a of voltage divider, the low-voltage arm 4b of voltage divider is connected with the end cap of shielding case II, voltage divider output terminal 13 is exported measuring-signal, voltage divider output terminal 13 is connected with an elastic piece structure, described elastic piece structure is comprised of spring 11 and copper sheet 14, after above-mentioned each parts are connected, finally by 12 sealings of the end cap on shielding case II right side.
Shielding case I 1a and shielding case II 1b adopt duralumin to make, and the thick 3mm of shell can fall extraneous complicated electromagnetic interference shield.In this example, on the interior ring center line of ring shielding shell 1, have a circle slot 9, when practical application, first in the slot 9 of shielding case I and shielding case II, respectively embed after the insulation cover pad that a 3mm is thick (not shown in FIG.), again above-mentioned mounted A, B two parts are nested in major loop rectangular copper bar, the contact pin 7a of fastening plug-in unit is inserted in slot 7b, A, B two parts are played and connected and fixation, finally pass through two external fastenings 8 by A, the fastening of B two parts.After fastening, after shielding case I and shielding case II docking, form a ring shielding shell 1, after magnetic core I and magnetic core II docking, form a toroidal core.The effect of slot 9 is: the one, and the magnetic field that guarantees to can be good at coil in shielding case being coupled main circuit current excites; The 2nd, cut off the induction circulation on shielding case; The 3rd, for providing, insulation cover pad embeds position.Magnetic core fixing device I I6a and magnetic core fixing device I I 6b are the ring texture that insulating material is made, and adopt epoxy resin ring in this example.
The design of coil: this measurement mechanism design frequency band is 40Hz～6MHz, depends primarily on the space capacitor C between coil and shielding case from integration type Rogowski coil high-frequency by frequency
0, space electric capacity is less, and high frequency is higher by frequency; Its low frequency depends primarily on the ratio of integrating circuit and coil inductance by frequency.Therefore, the number of turn of coil can not be too many, otherwise space capacitor C between coil and shielding case
0excessive, high frequency characteristics is bad; Coil turn can not be very little, otherwise electric current on coil is too large, and coil will generate heat, and the resistance that requires integrating circuit to produce is minimum.When coil turn is less, its low frequency be difficult for to reduce by frequency, therefore take soft magnetic ferrites as magnetic core to increase inductance.As calculated, the definite U-iron ferrite core of selecting of the present invention forms framed structure, and wherein the diameter of section of magnetic core I and magnetic core II is 15.5mm, relative permeability 2000.Coil I, II all adopt copper enameled wire, with the coil turn of copper enameled wire coiling on magnetic core I, are 34 circles: on two long limits of magnetic core I, be wound with respectively and on 14 circle coil I, minor face, be wound with 6 circle coil I; With the symmetrical coiling on magnetic core II of two copper enameled wires, be wound with altogether 26 circle coil II: first copper enameled wire is wound around and on 10 circle coil II, minor face, is wound around 3 circle coil II on a long limit of magnetic core II, second copper enameled wire is wound around and on 10 circle coil II, minor face, is wound around 3 circle coil II on another long limit of magnetic core II 2b; Coil I 5a and coil II 5b all carry out coiling in the same direction, and the turn-to-turn of coil 5a and coil II 5b is apart from being the even coiling of 8mm, and the spacing of coil I 5a and shielding case I and coil II 5b are 5mm with the spacing of shielding bridge II.
The design of integrating circuit 3: if adopt the minimum resistance of resistance to be difficult to processing, and it is larger affected by stray inductance, therefore as calculated, this Array selection is by 10 0.1 Ω resistance and be unified into the integrating circuit of 0.01 Ω, and this integrating circuit can effectively be eliminated the impact of stray inductance.
The design of voltage divider 4: described voltage divider 4 consists of the resistance of two series connection, one of them resistance is connected with integrating circuit 3 as high-voltage arm 4a, and another resistance is connected with shielding case II 1b as low-voltage arm 4b, and voltage divider output terminal 13 is exported measuring-signal.
Through many experiments, verify, more than the main circuit current measuring device of design has good shielding, little on the field strength distribution impact in change of current valve body, there is the advantages such as volume is little, the linearity good, reliability is high, good stability, this device frequency band is 40Hz～6MHz, sensitivity is 150mV/kA, and maximum error is 1.22%.Adopt the current measuring device measurement range of said structure to be ± 10kA, can make to measure range enough wide, can meet actual measurement demand.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not depart from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.
Claims (4)
1. a main circuit current measuring device for high-voltage DC transmission converter valve, it is arranged in the major loop rectangular copper bar in converter valve layer, this measurement mechanism comprises by shielding case I(1a) and shielding case II(1b) shielding case (1) that forms of docking, described shielding case I(1a) in, be provided with and be wound around coil I(5a) magnetic core I(2a), described shielding case II(1b) in be provided be wound around coil II(5b) magnetic core II(2b); Described magnetic core I(2a) and magnetic core II(2b) all adopt U-iron ferrite core, described shielding case I(1a) in, be provided with magnetic core I(2a) the magnetic core fixing device I (6a) that is fixed, shielding case II(1b) in be provided with magnetic core II(2b) the magnetic core fixing device I I(6b that is fixed); In described shielding case (1), be provided with fastening plug-in unit (7), described coil I(5a) with coil II(5b) be connected with fastening plug-in unit (7) respectively; Described magnetic core fixing device I (6a) and magnetic core fixing device I I(6b) ring texture made for insulating material, described magnetic core fixing device I (6a) is adhered to shielding case I(1a by insulating gel) inside, described magnetic core fixing device I I(6b) by insulating gel, be adhered to shielding case II(1b) inside; Described shielding case I(1a) and shielding case II(1b) all adopt U-shaped structure, described shielding case I(1a) and shielding case II(1b) openend docking after by external fastening (8), be fixed into a ring shielding shell (1); The interior ring center line of described shielding case (1) is provided with slot (9), embeds the insulation cover pad being useful on testee insulation isolation in described slot; Described shielding case I(1a) and shielding case II(1b) inside is provided with for fixed magnetic core I(2a) and magnetic core II(2b) insulating supporting (10); It is characterized in that:
Described shielding case II(1b) in, be also provided with integrating circuit (3) and voltage divider (4), described integrating circuit input end and shielding case II(1b) all with coil II(5b) be connected, described integrating circuit output terminal connects voltage divider (4), and described voltage divider output terminal (13) is exported measuring-signal;
Described coil I(5a), coil II(5b) all adopt copper enameled wire, with a copper enameled wire at magnetic core I(2a) coil turn of upper coiling is 34 circles, that is: magnetic core I(2a) and two long limits on be wound with respectively and on 14 circle coil I, minor face, be wound with 6 circle coil I; With two copper enameled wires at magnetic core II(2b) upper symmetrical coiling, be wound with altogether 26 circle coil II, that is: first copper enameled wire is at magnetic core II(2b) a long limit on be wound around on 10 circle coil II, minor face and be wound around 3 circle coil II, second copper enameled wire is at magnetic core II(2b) another long limit on be wound around and on 10 circle coil II, minor face, be wound around 3 circle coil II; Described coil I(5a) and coil II(5b) turn-to-turn apart from being 8mm;
Described integrating circuit (3) is by 10 0.1 Ω resistance and be unified into 0.01 Ω resistance and form.
2. main circuit current measuring device according to claim 1, it is characterized in that: described voltage divider (4) consists of the resistance of two series connection, one of them resistance is connected with integrating circuit (3) as high-voltage arm (4a), and another resistance is as low-voltage arm (4b) and shielding case II(1b) be connected.
3. current measuring device according to claim 2, it is characterized in that: described magnetic core I(2a) and magnetic core II(2b) diameter of section be 15.5mm, described shielding case I(1a) and shielding case II(1b) shell thick be 3mm, the width of described slot (9) is 2mm, the thickness of described insulation cover pad is 3mm, described coil I(5a) with spacing and the described coil II(5b of shielding case I) be 5mm with the spacing of shielding case II.
4. current measuring device according to claim 1, is characterized in that: the measurement range of this device is ± 10kA, and frequency band is 40Hz～6MHz, and sensitivity is 150mV/kA, and maximum error is 1.22%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010214584.4A CN101907651B (en) | 2010-06-25 | 2010-06-25 | Main circuit current measuring device for high-voltage DC transmission converter valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010214584.4A CN101907651B (en) | 2010-06-25 | 2010-06-25 | Main circuit current measuring device for high-voltage DC transmission converter valve |
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| CN101907651A CN101907651A (en) | 2010-12-08 |
| CN101907651B true CN101907651B (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010214584.4A Active CN101907651B (en) | 2010-06-25 | 2010-06-25 | Main circuit current measuring device for high-voltage DC transmission converter valve |
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| CN102646948A (en) * | 2012-04-11 | 2012-08-22 | 中国电力科学研究院 | Direct-current cable laying method capable of screening alternating-current electromagnetic interference |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2385339Y (en) * | 1999-07-09 | 2000-06-28 | 保定市霍尔电子有限公司 | Magnetic balancing current sensor for current measuring sampling |
| CN101650403A (en) * | 2009-09-15 | 2010-02-17 | 重庆大学 | Current sensor for polluted insulator leakage of AC high-voltage electric transmission line |
| CN201514850U (en) * | 2009-06-23 | 2010-06-23 | 王德坤 | Current transformer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0469337A (en) * | 1990-07-05 | 1992-03-04 | Unitika Ltd | Aldol reductase inhibitor |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2385339Y (en) * | 1999-07-09 | 2000-06-28 | 保定市霍尔电子有限公司 | Magnetic balancing current sensor for current measuring sampling |
| CN201514850U (en) * | 2009-06-23 | 2010-06-23 | 王德坤 | Current transformer |
| CN101650403A (en) * | 2009-09-15 | 2010-02-17 | 重庆大学 | Current sensor for polluted insulator leakage of AC high-voltage electric transmission line |
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