CN204116588U - The big current transient characterisitics pick-up unit of electronic current mutual inductor - Google Patents
The big current transient characterisitics pick-up unit of electronic current mutual inductor Download PDFInfo
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- CN204116588U CN204116588U CN201420465980.8U CN201420465980U CN204116588U CN 204116588 U CN204116588 U CN 204116588U CN 201420465980 U CN201420465980 U CN 201420465980U CN 204116588 U CN204116588 U CN 204116588U
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- 230000001052 transient effect Effects 0.000 title claims abstract description 49
- 238000012360 testing method Methods 0.000 claims abstract description 33
- 239000003990 capacitor Substances 0.000 claims description 32
- 230000002457 bidirectional effect Effects 0.000 claims description 4
- 238000013016 damping Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 16
- 230000002459 sustained effect Effects 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000007689 inspection Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
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- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The utility model provides a kind of big current transient characterisitics pick-up unit of electronic current mutual inductor, the wave form output unit comprising transformer, DC charging power supply and be connected with ECT test product; Wave form output unit comprises stable state waveform output unit and transient-wave output unit.Compared with prior art, the big current transient characterisitics pick-up unit of a kind of electronic current mutual inductor that the utility model provides, accurate adjustment can be carried out, to meet the testing requirement of different model electronic current mutual inductor test product to the transient voltage waveform exported and the current peak of transient current waveform, damping time constant.
Description
Technical field
The utility model relates to a kind of electronic current mutual inductor pick-up unit, is specifically related to a kind of big current transient characterisitics pick-up unit of electronic current mutual inductor.
Background technology
The relay protection of electronic current mutual inductor comprises direct method and waits ampere-turn method.Direct method by a Large Copacity and the current source possessing phase selection function test, process of the test demand fulfillment primary circuit is to the requirement of time constant simultaneously.But still do not possess at present and carry out long current transformer big current relay protection facility; As being 2kA when rated current, relay protection can not being carried out to it when symmetrical short-circuit electric current is 40kA, observing in a large number for a long time through the present inventor, studying the prior art that discovery there is no the transient error testing requirements that can meet extra-high voltage grid current transformer at present.
Because primary current is too large in electronic current mutual inductor relay protection process, the inspection under product export inspection, testing laboratory's inspection and on-the-spot handing-over environment is difficult to directly produce a stable rating test electric current.Therefore adopting Primary Conductor all around waiting the method for ampere-turn, with flexible circuit conductor at test product coil along the circumferential direction even coiling number circle coil, as an inferior ampere-turn coil, single turn small electric being flowed through and waits ampere-turn can produce an equivalent big current as experiment power supply.The field-checking of the raw delivery test of great current mutual inductor, the supporting current mutual inductor on site commissioning test of Large Copacity GIS and GTA is applicable to Deng ampere-turn method, but, waiting ampere-turn method to carry out in current transformer error process of the test in employing, there is deviation in the measuring error of its measuring error and direct method.
Analyze direct method and wait ampere-turn method known, its experiment abberation is all because metering level causes with the current transformer measuring level; The close value of iron core magnetic of metering level and measurement level current transformer is higher than protected level current transformer, and core section is long-pending also less.When electronic current mutual inductor actual motion, one time bus is placed in current transformer center, and the magnetic field that primary current produces is in core interior distribution uniform, and error performance meets design requirement.When employing waits ampere-turn method to carry out equivalent error test, although multiturn wire is in winding circumferentially equal distribution, its magnetic field piecewise uniform on the whole produced, but the magnetic field near every circle coil plane is the strongest, cause the magnetic of the iron core of its correspondence local closely to increase, even occur local magnetic saturation, iron loss increases, exciting current strengthens, and finally causes that current transformer error is also corresponding occurs deviation.Therefore by suitably increasing current transformer core cross section, reduce the close value of magnetic, increase shield winding, optimize the innovative approachs such as a wire arrangements improve direct method with etc. the inequivalence problem of ampere-turn method.
Electronic current mutual inductor synthetic test waits ampere-turn method to realize except a High-current output except employing, also will carry out the synthesis of stable state power current and direct current transient current, exports the fault current meeting standard-required; Therefore, provide a kind of and can seem particularly important to the transient characterisitics pick-up unit that the important parameter such as transient current peak value, damping time constant of electronic current mutual inductor carries out accurate adjustment.
Summary of the invention
In order to meet the needs of prior art, the utility model provides a kind of big current transient characterisitics pick-up unit of electronic current mutual inductor, the wave form output unit that described device comprises transformer, DC charging power supply and is connected with ECT test product; Described wave form output unit comprises stable state waveform output unit and transient-wave output unit.
Preferably, described stable state waveform output unit accesses the power frequency component loop of described ECT test product, to described power frequency component loop output AC voltage waveform and AC current waveform;
Described transient-wave output unit accesses the transient state component loop of described ECT test product, exports transient voltage waveform and transient current waveform to described transient state component loop;
Preferably, described stable state waveform output unit comprises the current lifting device unit be connected with described transformer; An output terminal of described current lifting device unit directly accesses the power frequency component loop of described ECT test product, and the other end accesses described power frequency component loop by bidirectional triode thyristor, current sensor and low sense shunt successively;
Described current lifting device unit comprises the pressure regulator be connected with described transformer, and is connected to the building-out capacitor between described pressure regulator and current lifting device;
Preferably, described transient-wave output unit comprises the charging thyristor of the positive terminal being connected to described DC charging power supply, double throw switch, electric discharge thyristor, adjustable resistance and controllable impedance; Low sense shunt is connected with the negative pole end of described DC charging power supply;
Preferably, described DC charging power supply two ends reverse parallel connection has fly-wheel diode; One end of described fly-wheel diode is connected between described electric discharge thyristor and adjustable resistance, and the other end is connected between the negative pole end of described DC charging power supply and low sense shunt;
Preferably, the number of described charging thyristor, double throw switch and electric discharge thyristor is 2; The series arm of described charging thyristor, double throw switch and an electric discharge thyristor is connected between the positive terminal of described DC charging power supply and described adjustable resistance; The series arm of thyristor, double throw switch and electric discharge thyristor of charging described in another is also connected between the positive terminal of described DC charging power supply and described adjustable resistance;
Preferably, described double throw switch is connected between the negative pole end of described DC charging power supply and low sense shunt respectively by storage capacitor;
When described charging thyristor is connected with described storage capacitor by described double throw switch, described DC charging power supply, charging thyristor and storage capacitor composition charge current loop, charge to described storage capacitor;
When described electric discharge thyristor is connected with described storage capacitor by described double throw switch, described electric discharge thyristor, storage capacitor and described fly-wheel diode composition discharge current loop, described storage capacitor electric discharge.
Compared with immediate prior art, excellent effect of the present utility model is:
1, in technical solutions of the utility model, adopting DC charging power supply to charge to storage capacitor, by controlling the size of direct supply, thus controlling the size of the transient current that transient-wave output unit exports;
2, in technical solutions of the utility model, at two ends reverse parallel connection fly-wheel diode of DC charging power supply, when making the voltage zero-cross reversal of poles in transient voltage waveform, this fly-wheel diode of forward conduction, resonance stops at voltage over zero, thus transient current waveform and the equal Pass Test requirement of transient voltage waveform;
3, in technical solutions of the utility model, employing double throw switch control charging thyristor is turned on or off with electric discharge thyristor, thus realizes the synthesis control of transient current waveform and transient voltage waveform;
4, in technical solutions of the utility model, adopt two discharge and recharge thyristors respectively, the reclosing that can realize electronic current mutual inductor big current synthetic test controls;
5, in technical solutions of the utility model, adjustable resistance and controllable impedance is adopted to carry out accurate adjustment to steady state voltage waveform, steady-state current waveform, transient current waveform and transient voltage waveform;
6, in technical solutions of the utility model, adopt current lifting device the electric current obtained from transformer can be carried out up-flow, each current lifting device is exportable separately reaches hundreds of Ampere currents, and multiple current lifting device combines and can export the needs that big current meets monitoring device
7, in technical solution of the present invention, bidirectional triode thyristor is adopted can to realize carrying out conducting to alternating current in stable state waveform.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is further illustrated.
Fig. 1 is: a kind of structural drawing of big current transient characterisitics pick-up unit of electronic current mutual inductor in the utility model embodiment;
Fig. 2 is: transient-wave output unit structural drawing in Fig. 1;
Fig. 3 is: the fundamental diagram of sustained diode 5 in Fig. 1;
Fig. 4 is: the harmonic wave figure of energy-storage capacitor electric discharge during sustained diode 5 locking in Fig. 1;
Fig. 5 is: the partial enlarged drawing of the figure of harmonic wave shown in Fig. 4;
Fig. 6 is: the harmonic wave figure of energy-storage capacitor electric discharge during sustained diode 5 conducting in Fig. 1.
Embodiment
Be described below in detail embodiment of the present utility model, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the utility model, and can not be interpreted as restriction of the present utility model.
As shown in Figure 1, described pick-up unit comprises controller unit, transformer, DC charging power supply and wave form output unit to the big current transient characterisitics structure of the detecting device of the electronic current mutual inductor provided in the present embodiment;
1, as shown in Figure 1, wave form output unit comprises stable state waveform output unit and transient-wave output unit; Stable state waveform output unit is connected to the power frequency component loop of transformer and ECT test product, to power frequency component loop output AC voltage waveform and AC current waveform; Transient-wave output unit is connected to the transient state component loop of DC charging power supply and ECT test product, exports transient voltage waveform and transient current waveform to transient state component loop;
(1) stable state waveform output unit;
Stable state waveform output unit comprises current lifting device unit, bidirectional triode thyristor, current sensor CT and low sense shunt L2 as shown in the figure; The pressure regulator of current lifting device unit and Circuit Fault on Secondary Transformer winding switching, building-out capacitor is connected between pressure regulator and current lifting device;
(2) transient-wave output unit;
1.: transient-wave output unit is connected between DC charging power supply and ECT test product as shown in Figure 2, comprising: charging thyristor D1 and D2, electric discharge thyristor D3 and D4, sustained diode 5, double throw switch K1 and K2, storage capacitor C1 and C2 adjustable resistance, controllable impedance and low sense shunt;
Charging thyristor D1, double throw switch K1, electric discharge thyristor D3, adjustable resistance and controllable impedance are connected between the positive terminal of DC charging power supply and ECT test product successively; Charging thyristor D2, double throw switch K2, electric discharge thyristor D4, adjustable resistance and controllable impedance are connected between the positive terminal of DC charging power supply and ECT test product equally successively;
Sustained diode 5 is connected in reverse parallel in DC charging power supply two ends, and the backward end of sustained diode 5 is connected with the backward end of electric discharge thyristor respectively, and the forward end of sustained diode 5 is connected with the negative pole end of DC charging power supply;
Double throw switch K1 and K2 is connected between DC charging power supply and low sense shunt respectively by storage capacitor C1 and C2.
2.: transient-wave output unit comprises charge current loop and discharge current loop, is specially:
When double throw switch K1 is connected with charging thyristor D1, double throw switch K2 is connected with charging thyristor D2, and now DC charging power supply, charging thyristor, double throw switch and storage capacitor composition charge current loop, charge to storage capacitor;
When double throw switch K1 is connected with electric discharge thyristor D3, double throw switch K2 is connected with electric discharge thyristor D4, the thyristor that now discharges, double throw switch, storage capacitor and fly-wheel diode composition charge current loop, and storage capacitor discharges;
Fig. 3 shows the principle of work of sustained diode 5 in discharge current loop, and wherein the effect of sustained diode 5 comprises:
(1), when transient-wave output unit is discharge current loop state, afterflow in circuit, the electron device in protection circuit.
(2), when transient-wave output unit is discharge current loop state, sustained diode 5 is forward conduction when the voltage zero-cross reversal of poles of transient voltage waveform, thus the resonance when voltage over zero is stopped, discharge current is exponentially decayed, and meets the output requirement of transient voltage waveform;
1., in Fig. 2 double throw switch K comprises double throw switch K1 and K2, and storage capacitor C comprises storage capacitor C1 and C2; When double throw switch K is connected with electric discharge thyristor, storage capacitor, adjustable resistance R1, controllable impedance L form typical RLC second-order circuit, and because adjustable resistance is Milliohm resistance, therefore this RLC second-order circuit is underdamping second-order circuit; Fig. 4 shows storage capacitor to adjustable resistance and controllable impedance electric discharge, and the transient voltage waveform that wave form output unit exports and transient current waveform, because RLC second-order circuit is underdamping second-order circuit, so above-mentioned two waveforms are all progressively decayed;
2. the transient voltage waveform, shown in Fig. 4 and transient current waveform do not meet the wave form output requirement of the present embodiment test, the oscillating waveform time length after first peak value of its transient voltage waveform and transient current waveform, poor stability; In actual electrical type current transformer big current synthetic test, set the waveform time length after the size of first peak value and first peak value according to the electronic current mutual inductor of different electric pressure.When can determine the voltage over zero of transient voltage waveform by Fig. 5, the resonance current of transient current waveform reaches maximal value, if now allow resonance stop, discharge current exponentially will be decayed with regular hour constant, then transient current waveform meets testing requirements;
When the voltage zero-cross reversal of poles of transient voltage waveform, forward conduction sustained diode 5, storage capacitor is shorted, destroy condition of resonance, resonance is stopped at voltage over zero, and now RLC second-order circuit changes RL firstorder circuit into, as shown in Figure 6, transient current waveform is decayed according to the zero input response of RL firstorder circuit after electric current reaches maximal value, this transient current waveform and Pass Test requirement;
Wherein, resonance current refers to the discharge current of storage capacitor release.
Finally should be noted that: described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
Claims (5)
1. a big current transient characterisitics pick-up unit for electronic current mutual inductor, is characterized in that, the wave form output unit that described device comprises transformer, DC charging power supply and is connected with ECT test product; Described wave form output unit comprises stable state waveform output unit and transient-wave output unit;
Described stable state waveform output unit comprises the current lifting device unit be connected with described transformer; An output terminal of described current lifting device unit directly accesses the power frequency component loop of described ECT test product, and the other end accesses described power frequency component loop by bidirectional triode thyristor, current sensor and low sense shunt successively;
Described current lifting device unit comprises the pressure regulator be connected with described transformer, and is connected to the building-out capacitor between described pressure regulator and current lifting device;
Described transient-wave output unit comprises the charging thyristor of the positive terminal being connected to described DC charging power supply, double throw switch, electric discharge thyristor, adjustable resistance and controllable impedance; Low sense shunt is connected with the negative pole end of described DC charging power supply.
2. pick-up unit as claimed in claim 1, it is characterized in that, described stable state waveform output unit accesses the power frequency component loop of described ECT test product, to described power frequency component loop output AC voltage waveform and AC current waveform;
Described transient-wave output unit accesses the transient state component loop of described ECT test product, exports transient voltage waveform and transient current waveform to described transient state component loop.
3. pick-up unit as claimed in claim 1, it is characterized in that, described DC charging power supply two ends reverse parallel connection has fly-wheel diode; One end of described fly-wheel diode is connected between described electric discharge thyristor and adjustable resistance, and the other end is connected between the negative pole end of described DC charging power supply and low sense shunt.
4. pick-up unit as claimed in claim 1, it is characterized in that, the number of described charging thyristor, double throw switch and electric discharge thyristor is 2; The series arm of described charging thyristor, double throw switch and an electric discharge thyristor is connected between the positive terminal of described DC charging power supply and described adjustable resistance; The series arm of thyristor, double throw switch and electric discharge thyristor of charging described in another is also connected between the positive terminal of described DC charging power supply and described adjustable resistance.
5. pick-up unit as claimed in claim 4, it is characterized in that, described double throw switch is connected between the negative pole end of described DC charging power supply and low sense shunt respectively by storage capacitor;
When described charging thyristor is connected with described storage capacitor by described double throw switch, described DC charging power supply, charging thyristor and storage capacitor composition charge current loop, charge to described storage capacitor;
When described electric discharge thyristor is connected with described storage capacitor by described double throw switch, described electric discharge thyristor, storage capacitor and fly-wheel diode composition discharge current loop, described storage capacitor electric discharge.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420465980.8U CN204116588U (en) | 2014-08-18 | 2014-08-18 | The big current transient characterisitics pick-up unit of electronic current mutual inductor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420465980.8U CN204116588U (en) | 2014-08-18 | 2014-08-18 | The big current transient characterisitics pick-up unit of electronic current mutual inductor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865427A (en) * | 2015-05-29 | 2015-08-26 | 国网河南省电力公司电力科学研究院 | Precise high-current transient current rise generating device |
| CN105676161A (en) * | 2016-03-30 | 2016-06-15 | 国网电力科学研究院武汉南瑞有限责任公司 | Alternating current/direct current transient steady state integrated detection device |
| CN117031380A (en) * | 2023-10-08 | 2023-11-10 | 清华四川能源互联网研究院 | Current sensor low-frequency characteristic verification circuit and verification method thereof |
| CN117031379A (en) * | 2023-10-08 | 2023-11-10 | 清华四川能源互联网研究院 | High-frequency characteristic verification circuit of current sensor and verification method thereof |
-
2014
- 2014-08-18 CN CN201420465980.8U patent/CN204116588U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865427A (en) * | 2015-05-29 | 2015-08-26 | 国网河南省电力公司电力科学研究院 | Precise high-current transient current rise generating device |
| CN104865427B (en) * | 2015-05-29 | 2018-02-16 | 国网河南省电力公司电力科学研究院 | A kind of transient state up-flow generating means of accurate high current |
| CN105676161A (en) * | 2016-03-30 | 2016-06-15 | 国网电力科学研究院武汉南瑞有限责任公司 | Alternating current/direct current transient steady state integrated detection device |
| CN105676161B (en) * | 2016-03-30 | 2019-01-25 | 国网电力科学研究院武汉南瑞有限责任公司 | The temporary stable state of alternating current-direct current is detecting device integrated |
| CN117031380A (en) * | 2023-10-08 | 2023-11-10 | 清华四川能源互联网研究院 | Current sensor low-frequency characteristic verification circuit and verification method thereof |
| CN117031379A (en) * | 2023-10-08 | 2023-11-10 | 清华四川能源互联网研究院 | High-frequency characteristic verification circuit of current sensor and verification method thereof |
| CN117031379B (en) * | 2023-10-08 | 2023-12-19 | 清华四川能源互联网研究院 | High-frequency characteristic verification circuit of current sensor and verification method thereof |
| CN117031380B (en) * | 2023-10-08 | 2023-12-19 | 清华四川能源互联网研究院 | Current sensor low-frequency characteristic verification circuit and verification method thereof |
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Granted publication date: 20150121 |