CN101907651A - 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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- CN101907651A CN101907651A CN2010102145844A CN201010214584A CN101907651A CN 101907651 A CN101907651 A CN 101907651A CN 2010102145844 A CN2010102145844 A CN 2010102145844A CN 201010214584 A CN201010214584 A CN 201010214584A CN 101907651 A CN101907651 A CN 101907651A
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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 the 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
The HVDC converter valve belongs to hoisting structure, when test such as carry out that excess current, superpotential, non-periodic trigger, can flow through heavy impulse current in the major loop, at present, the method of determining this electric current only is confined to simulation calculation, but in test, converter valve is positioned at noble potential, its electromagnetic environment of living in is very abominable, and the interior string of each valve layer also has nonlinear devices such as reactor, capacitor, stray capacitance between being subject to layer by layer, between layer ground, the influence of inductance, so the simulation calculation existence can not be satisfied the actual needs of engineering than mistake.In the process of the test, will flow through thousands of amperes excess current in the converter valve major loop, when so big electric current is flowed through thyristor, may burn thyristor, have great potential safety hazard.Therefore, press for the main circuit current measuring device that to insert in the 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 provides 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 installed on the interior major loop rectangular copper bar of converter valve layer, this measurement mechanism comprises the shielding case that is formed by shielding case I and shielding case II butt joint, be provided with the magnetic core I that is twining coil I in the described shielding case I, be provided with the magnetic core II that is twining coil II in the described shielding case II, integrating circuit and voltage divider, described integrating circuit input end all is connected with coil II with shielding case II, described integrating circuit output terminal connects voltage divider, and described voltage divider output terminal is exported measuring-signal.
Wherein, described magnetic core I and magnetic core II all adopt the U-iron ferrite core, be provided with the magnetic core fixing device I that magnetic core I is fixed in the described shielding case I, be provided with the magnetic core fixing device I I that magnetic core II is fixed in the shielding case II, described magnetic core I docks the back and forms a toroidal core with magnetic core II.
Wherein, be provided with fastening plug-in unit in the 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 described magnetic core fixing device I is adhered to shielding case I inside by insulating gel, and described magnetic core fixing device I I is bonding and shielding case II inside by insulating gel.
Wherein, described shielding case I and shielding case II all adopt the U-shaped structure, and the openend butt joint back of described shielding case I and shielding case II is fixed into a ring shielding shell by external fastening.
Wherein, the interior ring center line of described shielding case is provided with slot, embeds to be useful on the insulation sleeve gasket that insulation is isolated with testee in described slot.
Wherein, described shielding case I and shielding case II inside are provided with the insulation support that is used for fixing magnetic core I and magnetic core II.
Wherein, the coil I number of turn that described magnetic core I goes up coiling is 34 circles, and the coil II number of turn that described magnetic core II goes up coiling is 26 circles, and the turn-to-turn distance of described coil I and coil II is 8mm.
Wherein, described integrating circuit is made of 10 parallel resistor.
Wherein, described voltage divider is made 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 to be 3mm, and the width of described slot is 2mm, the thickness of described insulation sleeve gasket 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) reliability height, the good stability of this measurement mechanism, measurement range can reach ± 10kA, and possesses good linearty;
2) this measurement mechanism frequency band can reach 40Hz～6MHz, and low-and high-frequency is corresponding good, and measuring maximum error is 1.22% only, is far smaller than 3% of high-tension measurement standard-required;
3) this measurement mechanism housing shroud performance is good, owing to be embedded in the insulation sleeve gasket at the slot of interior ring center line, make measurement mechanism and circuit-under-test not only not have and is electrically connected but also can closely contacts, and is safe and reliable;
4) inner core of this measurement mechanism and exterior shield shell all adopt the loop configuration that two U-shaped member butt joints are formed, it is little to have volume, lightweight advantage, and this measurement mechanism is nested in it on the major loop rectangular copper bar in converter valve layer by fastening plug-in unit, easy for installation, simple to operate.
Description of drawings
Fig. 1 is from integration type Rogowski coil equivalent circuit diagram;
Fig. 2 is the installation site synoptic 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 synoptic 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, the 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, the support of insulating of 7b-contact pin, 8-external fastening, 9-slot, 10-, the 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 around the skeleton of tested electric current
0, then the coil two ends can induce the induced potential e (t) that is directly proportional with 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, then integrating circuit R
rThe voltage waveform U at two ends
Out(t) consistent with the waveform of tested electric current.Described C
0Be coil L
0And the electric capacity that produces between the shielding case, described R
0Be coil L
0And the resistance that produces between the shielding case.
As shown in Figure 2, current measuring device of the present invention is installed on the major loop rectangular copper bar in the converter valve layer, so configuration design becomes counterpart formula structure, and this structural volume is little, and is easy for installation.
Shown in Fig. 3,4, this current measuring device mainly comprises A, B two parts:
The A part mainly comprises U-shaped shielding case I 1a and U-shaped magnetic core I 2a.Be symmetrically distributed with two magnetic core fixing device I 6a and two insulation of being used for fixing magnetic core I 2a in the shielding case I 1a and support 10, magnetic core fixing device I 6a and insulation are supported 10 and are adhered in the shielding case I1a by insulating gel, be arranged side by side a fastening plug-in unit 7 in the front of magnetic core fixing device I 6a, fastening plug-in unit is made up of contact pin 7a and slot 7b, and the contact pin 7a of fastening plug-in unit is adhered in the shielding case I 1a by insulating gel in this example; On magnetic core I 2a, the coil I 5a that twines on the magnetic core I 2a after the coiling evenly distributes with the winding of a copper enameled wire.Open the end cap 12 in shielding case I left side, the magnetic core I that is wound with coil I is stretched in the shielding case I, and insulation is passed on two long limits of this magnetic core I successively support 10 and magnetic core fixing device I 6a, with 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, again with end cap 12 sealings in shielding case I left side.
The B part mainly comprises U-shaped shielding case II 1b, U-shaped magnetic core II 2b, integrating circuit 3 and voltage divider 4.Be symmetrically distributed with two magnetic core fixing device I I 6b and two insulation of being used for fixing magnetic core I 2a in the shielding case II 1b and support 10, magnetic core fixing device I I 6b and insulation support 10 by insulating gel bonding with shielding case II 1b in, the slot 7b of fastening plug-in unit is adhered in the shielding case II 1b by insulating gel in this example; On magnetic core II 2b, the coil II 5b that twines on the magnetic core II 2b after the coiling evenly distributes with the winding of two copper enameled wire symmetries.Open the end cap 12 on shielding case II right side, the magnetic core II that is wound with coil II is stretched in the shielding case II, and insulation is passed on two long limits of this magnetic core II successively support 10 and magnetic core fixing device I I 6b, two coil II joints of two copper enameled wire head ends are connected with two slot 7b respectively, two coil II joints with two copper enameled wire ends are connected with shielding case II with the integrating circuit input end respectively again, the integrating circuit output terminal connects the high-voltage arm 4a of voltage divider, the low-voltage arm 4b of voltage divider links to each other 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 made up of spring 11 and copper sheet 14, after above-mentioned each parts are connected, at last with end cap 12 sealings 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.On the interior ring center line of ring shielding shell 1, have a circle slot 9 in this example, when practical application, after earlier in the slot 9 of shielding case I and shielding case II, respectively embedding the thick insulation sleeve gasket (not drawing among the figure) of a 3mm, again above-mentioned mounted A, B two parts are nested on the major loop rectangular copper bar, the contact pin 7a of fastening plug-in unit is inserted among the slot 7b, A, B two parts are played connection and fixation, by two external fastenings 8 A, the fastening of B two parts are got final product at last.After the fastening, shielding case I and shielding case II butt joint back form a ring shielding shell 1, and magnetic core I and magnetic core II butt joint back 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 the shielding case being coupled main circuit current excites; The 2nd, cut off the induction circulation on the shielding case; The 3rd, for providing, the insulation sleeve gasket embeds the 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 the epoxy resin ring in this example.
The design of coil: this measurement mechanism design frequency band is 40Hz～6MHz, depends primarily on space capacitor C between coil and the shielding case from integration type Rogowski coil high frequency by frequency
0, space electric capacity is more little, and high frequency is high more 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 the space capacitor C between coil and the shielding case
0Excessive, high frequency characteristics is bad; Coil turn can not be very little, otherwise the electric current on the coil is too big, and coil will generate heat, and the resistance that requires integrating circuit to produce is minimum.When coil turn more after a little while, its low frequency be difficult for to reduce by frequency, therefore take soft magnetic ferrites as magnetic core to increase inductance.As calculated, the present invention determines to select for use the U-iron ferrite core to form 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 the copper enameled wire, are 34 circles with a copper enameled wire at the coil turn of coiling on the magnetic core I: be wound with respectively on two long limits of magnetic core I and be wound with 6 circle coil I on 14 circle coil I, the minor face; With the symmetrical coiling on magnetic core II of two copper enameled wires, be wound with 26 circle coil II altogether: first copper enameled wire twining winding 3 circle coil II on 10 circle coil II, the minor face on the long limit of magnetic core II, and second copper enameled wire twines on another long limit of magnetic core II 2b and twine 3 circle coil II on 10 circle coil II, the minor face; 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 bigger influenced by stray inductance, therefore as calculated, this device selection is with 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 influence of stray inductance.
The design of voltage divider 4: described voltage divider 4 is made of the resistance of two series connection, and 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 repeatedly experimental verification, more than She Ji main circuit current measuring device has good shielding, little to the influence of the field strength distribution in the change of current valve body, have 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 the measurement range enough wide, can satisfy the actual measurement demand.
Should be noted that at last: 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 the foregoing description, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (11)
1. main circuit current measuring device for high-voltage DC transmission converter valve, it is installed on the interior major loop rectangular copper bar of converter valve layer, it is characterized in that: this measurement mechanism comprises the shielding case (1) that is formed by shielding case I (1a) and shielding case II (1b) butt joint, be provided with the magnetic core I (2a) that is twining coil I (5a) in the described shielding case I (1a), be provided with the magnetic core II (2b) that is twining coil II (5b) in the described shielding case II (1b), integrating circuit (3) and voltage divider (4), described integrating circuit input end all is connected with coil II (5b) with shielding case II (1b), described integrating circuit output terminal connects voltage divider (4), and described voltage divider output terminal (13) is exported measuring-signal.
2. main circuit current measuring device according to claim 1, it is characterized in that: described magnetic core I (2a) and magnetic core II (2b) all adopt the U-iron ferrite core, be provided with the magnetic core fixing device I (6a) that magnetic core I (2a) is fixed in the described shielding case I (1a), be provided with the magnetic core fixing device I I (6b) that magnetic core II (2b) is fixed in the shielding case II (1b).
3. main circuit current measuring device according to claim 2 is characterized in that: be provided with fastening plug-in unit (7) in the described shielding case (1), described coil I (5a) is connected with fastening plug-in unit (7) respectively with coil II (5b).
4. main circuit current measuring device according to claim 3, it is characterized in that: the ring texture that described magnetic core fixing device I (6a) and magnetic core fixing device I I (6b) make for insulating material, described magnetic core fixing device I (6a) is adhered to shielding case I (1a) inside by insulating gel, and described magnetic core fixing device I I (6b) is adhered to shielding case II (1b) inside by insulating gel.
5. main circuit current measuring device according to claim 4, it is characterized in that: described shielding case I (1a) and shielding case II (1b) all adopt the U-shaped structure, and the openend butt joint back of described shielding case I (1a) and shielding case II (1b) is fixed into a ring shielding shell (1) by external fastening (8).
6. main circuit current measuring device according to claim 5 is characterized in that: the interior ring center line of described shielding case (1) is provided with slot (9), embeds to be useful on the insulation sleeve gasket that insulation is isolated with testee in described slot.
7. main circuit current measuring device according to claim 6 is characterized in that: described shielding case I (1a) and shielding case II (1b) inside are provided with the insulation that is used for fixing magnetic core I (2a) and magnetic core II (2b) and support (10).
8. main circuit current measuring device according to claim 7, it is characterized in that: coil I (5a) number of turn that described magnetic core I goes up coiling is 34 circles, coil II (5b) number of turn that described magnetic core II goes up coiling is 26 circles, and the turn-to-turn distance of described coil I (5a) and coil II (5b) is 8mm.
9. main circuit current measuring device according to claim 8 is characterized in that: described integrating circuit (3) is made of 10 parallel resistor.
10. main circuit current measuring device according to claim 9, it is characterized in that: described voltage divider (4) is made 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).
11. current measuring device according to claim 10, it is characterized in that: the diameter of section of described magnetic core I (2a) and magnetic core II (2b) is 15.5mm, the shell of described shielding case I (1a) and shielding case II (1b) is thick to be 3mm, the width of described slot (9) is 2mm, the thickness of described insulation sleeve gasket is 3mm, and described coil I (5a) is 5mm with the spacing of shielding case I and the spacing of described coil II (5b) and shielding case II.
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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| Publication Number | Publication Date |
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| CN101907651A true CN101907651A (en) | 2010-12-08 |
| CN101907651B CN101907651B (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0469337A (en) * | 1990-07-05 | 1992-03-04 | Unitika Ltd | Aldol reductase inhibitor |
| 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 |
-
2010
- 2010-06-25 CN CN201010214584.4A patent/CN101907651B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0469337A (en) * | 1990-07-05 | 1992-03-04 | Unitika Ltd | Aldol reductase inhibitor |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN101907651B (en) | 2014-03-12 |
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