CN203688621U - Electronic current transformer - Google Patents
Electronic current transformer Download PDFInfo
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- CN203688621U CN203688621U CN201320728384.XU CN201320728384U CN203688621U CN 203688621 U CN203688621 U CN 203688621U CN 201320728384 U CN201320728384 U CN 201320728384U CN 203688621 U CN203688621 U CN 203688621U
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- Expired - Lifetime
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- 238000004804 winding Methods 0.000 claims abstract description 93
- 239000013307 optical fiber Substances 0.000 claims abstract description 9
- 230000005540 biological transmission Effects 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 claims description 44
- 238000012216 screening Methods 0.000 claims description 14
- 238000009422 external insulation Methods 0.000 claims description 13
- 229910018503 SF6 Inorganic materials 0.000 claims description 5
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims description 5
- 229960000909 sulfur hexafluoride Drugs 0.000 claims description 5
- 239000004020 conductor Substances 0.000 claims description 3
- 239000002274 desiccant Substances 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims description 2
- 238000004880 explosion Methods 0.000 claims description 2
- 230000006698 induction Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 230000009466 transformation Effects 0.000 abstract description 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 abstract 4
- 238000000034 method Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000033772 system development Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The utility model provides an electronic current transformer composed of a heat component, a body component and a bottom component. The top of the body component is connected with the head component. The bottom of the body component is connected with a pedestal. A low-power measuring winding is contained in the head component. A winding supporting rod is contained in the body component. In addition, an aviation terminal is arranged at the bottom end of the winding supporting rod. A secondary analog-digital converter is arranged in the pedestal. An optical fiber output port is formed in the sidewall of the pedestal. The aviation terminal, the low-power measuring winding and the secondary analog-digital converter are successively connected through wires. The secondary analog-digital converter is connected with the optical fiber output port through an optical fiber. The secondary analog-digital converter is connected with a low-voltage power source on the external portion of the pedestal through an electric wire. The electronic current transformer has advantages of effectively preventing interference of the high voltage, ensuring the accuracy of output signals of the transformer and achieving authenticity of measuring and metering of power transmission and transformation wires and reliability of relay protection.
Description
Technical field
The utility model belongs to high voltage electric equipment technical field, is specifically related to a kind of electronic current mutual inductor.
Background technology
Electronic mutual inductor is indispensable visual plant in intelligent grid, and its effect is exactly to realize and high-tension isolation, and the numerical value of large electric current in ultra-high-tension power transmission line is sent to measurement of correlation instrument in the mode of weak signal, realizes its measurement and route protection.Electronic current mutual inductor has adopted advanced electromagnetic induction technology, modulus conversion technique, photoelectron technology and integrated electronic technology, have simple in structure, good insulation preformance, range of dynamic measurement large, be convenient to realize the features such as intelligent, meet the growth requirement of intelligent grid, it is had broad application prospects in Future Power System development.
But; existing electronic mutual inductor is that secondary digital to analog converter is arranged in the housing in high-voltage; this just makes secondary digital to analog converter under high-tension working environment, high-current conductor be gathered and analog to digital conversion induced signal; subsequently just by optical fiber by the digital data transmission being converted to electronic instrument, realize metering, measurement and relay protection to high-tension current.In above-mentioned hyperbaric environment, the Capability Requirement of the anti-high-voltage electric field electromagnetic interference (EMI) to secondary digital to analog converter is higher; In fact; owing to being subject to the restriction of anti-high-voltage electric field environment; the output accuracy grade of electronic current mutual inductor is low; and accuracy class is easily drifted about; directly cause the inaccuracy of measurement, metering; even cause the misoperation of relay protection device, bring serious inaccuracy, unreliability and insecurity to power transmission and transformation.Simultaneously, because secondary digital to analog converter is carrying out the power supply of secondary digital-to-analog conversion process need external power supply, but because it is in high-pressure side, what adopt at present mostly is laser powered sensor and gets two kinds of energy coil power supplies, the former laser powered sensor cost is too high, and the life-span is limited, can not meet the requirement in serviceable life of electronic current mutual inductor, the latter's power taking energy coil method for power supplying, because being subject in high-tension line the impact of actual current larger, can not meet the stability requirement to power supply in secondary digital-to-analog conversion process.
In addition, prior art scheme is, by sieve formula coil, high pressure primary current is sensed as to a less analog quantity voltage signal, and this analog quantity voltage signal self is subject to the impact of electromagnetic interference (EMI); The analog quantity voltage signal that again this is subject to electromagnetic interference (EMI) sends to and is subject to equally electromagnetic interference influence and carries out signal processing in the secondary digital to analog converter of high-pressure side, cannot guarantee precision and the validity measured.
Utility model content
For electronic current mutual inductor above shortcomings; the utility model provides a kind of electronic current mutual inductor; can effectively avoid high-tension interference; guarantee the accuracy of mutual inductor output signal; realize the measurement to power transmission and transformation line, the authenticity of metering; the reliability of route protection, its concrete structure is as follows:
A kind of electronic current mutual inductor, the top that is made up of body parts head assembly, body parts and bottom part is connected with head assembly, and the bottom of body parts is connected with head assembly described in base 18 and is made up of explosion-protection equipment 4, external shield cylinder 5, hold down gag 6, inner screening cylinder 7, primary connection terminal 8, primary conductive bar 9, low-power measurement winding 11, underpower protection winding 12 and housing 13; Wherein, housing 13 is the cylinder of upper end closure and hollow; Be provided with explosion-protection equipment 4 at the top of housing 13; On the inner chamber of housing 13, level is fixed with primary conductive bar 9; The cylinder that described primary conductive bar 9 is hollow, the two ends of primary conductive bar 9 all extend to the outside of housing 13; Be connected with primary connection terminal 8 in the both side ends of primary conductive bar 9;
Be wound with successively low-power measurement winding 11 and underpower protection winding 12 along the outer wall of primary conductive bar 9; Guarantee low-power measurement winding 11 and underpower protection winding 12 close contacts by hold down gag 6; Inner side at low-power measurement winding 11 and underpower protection winding 12 is provided with inner screening cylinder 7, outside at low-power measurement winding 11 and underpower protection winding 12 is provided with external shield cylinder 5, realizes the electromagnetic screen to low-power measurement winding 11 and underpower protection winding 12 by external shield cylinder 5 and the mutual fastening of inner screening cylinder 7;
Described body parts is made up of winding support bar 14, radome 15 and external insulation casing pipe 16; The top of winding support bar 14 is connected with external shield cylinder 5, and on the shaft of winding support bar 14, cover has radome 15 and external insulation casing pipe 16 successively; The top of external insulation casing pipe 16 and housing 13, bottom is connected with base 18;
The box body structure that base 18 is rectangle, the top of base 18 is connected with the bottom of winding support bar 14, the bottom of external insulation casing pipe 16 respectively; On base 18 end faces of 14 enclosing region of winding support bar, have through hole; These external winding support bar 14 bottom port places are provided with aviation terminal 19, by wire, low-power measurement winding 11 is connected with aviation terminal 19 respectively with underpower protection winding 12, in described base 18, be provided with secondary analog to digital converter 20, on the sidewall of base 18, be provided with fiber-optic output mouth 21; By wire, secondary digital to analog converter 20 is connected with aviation terminal 19, by optical fiber, secondary digital to analog converter 20 is connected with fiber-optic output mouth 21; Fiber-optic output mouth 21 gathers standard signal to pulpit for user.
By electric wire, secondary digital to analog converter 20 is connected with the low-tension supply of base 18 outsides and power taking.
the beneficial effects of the utility model are embodied in as follows:
Because having solved secondary analog to digital converter, electronic current mutual inductor of the present utility model is subject to the electromagnetic interference influence under high-voltage electric field, guarantee the precision of current transformer, reach measuring accuracy 0.2S level, the requirement of protection precision 5TPE level, especially under product ruuning situation, realize the accuracy of measuring, measuring, relay protection device reliability of operation and security; Secondary digital to analog converter, directly in low pressure end power supply, has saved expensive laser power power supply or has got energy coil power supply simultaneously, has reduced the manufacturing cost of product, has improved the stability of secondary digital to analog converter work, and the serviceable life of having improved product.
1. primary current inductive coil of the present utility model that is described low-power measurement winding 11, underpower protection winding 12; to be similar to loss-free ironcore choke by one; high pressure primary current is transformed to a less electric current; and by the wire that not disturbed by high-voltage electromagnetic; current signal is sent to described secondary digital to analog converter 20; guarantee little electric current accuracy and the stability of primary sample; the Stability and veracity of the information source also guaranteeing, simultaneously also just for the Stability and veracity that guarantees product provides Reliable guarantee.
2. the utility model is to adopt simulating signal by the wire that not disturbed by high-voltage electromagnetic, analog current signal is sent to described secondary digital to analog converter 20, guarantee that signal can not be depleted or disturb in transmitting procedure, guaranteed accurate, the reliable delivery of signal source.
3. secondary analog to digital converter 20 described in the utility model, be placed in base member described in the utility model 18 inside, and described base member 18 is the bottoms in product, belong to earth potential, in analog-digital conversion process, there is no the interference of high-voltage electromagnetic, guarantee the reliably working of described secondary analog to digital converter 20 internal electronic devices, also just guaranteed to be converted to accuracy and reliability in the process of digital quantity in analog quantity.
4. due to described secondary analog to digital converter 20, be placed in base member described in the utility model 18 inside, the maintenance, the maintenance that have greatly facilitated product to be in operation.
5. what the secondary analog to digital converter 20 described in used is low-tension supply power supply, save expensive laser power and supplied or got energy coil power supply, reduce the manufacturing cost of product, improved the stability of secondary digital to analog converter work, and the serviceable life of having improved product.
6. the utility model has been quoted described aviation terminal 19 splicing optical fibers output ports 21, substitute the general ordinary optic fibre extension line plate of existing electronic current mutual inductor, easy to connect reliable, contraposition can mistake, has guaranteed reliability and the operability of fiberoptic connection.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present utility model.
Fig. 2 is the local enlarged diagram of the a-quadrant of Fig. 1.
Fig. 3 is the local enlarged diagram in the B region of Fig. 1.
Sequence number in upper figure: explosion-protection equipment 4, external shield cylinder 5, hold down gag 6, inner screening cylinder 7, primary connection terminal 8, primary conductive bar 9, low-power measurement winding 11, underpower protection winding 12, housing 13, winding support bar 14, radome 15, external insulation casing pipe 16, sulfur hexafluoride gas drying agent 17, base 18, aviation terminal 19, secondary converter 20, fiber-optic output mouth 21.
Concrete embodiment
Now by reference to the accompanying drawings structure of the present utility model is described further.
Referring to Fig. 1, a kind of electronic current mutual inductor, is made up of head assembly, body parts and base 18; The top of body parts is connected with head assembly, and the bottom of body parts is connected with base 18.
Referring to Fig. 2, described head assembly is made up of explosion-protection equipment 4, external shield cylinder 5, hold down gag 6, inner screening cylinder 7, primary connection terminal 8, primary conductive bar 9, low-power measurement winding 11, underpower protection winding 12 and housing 13; Wherein, housing 13 is the cylinder of upper end closure and hollow; Be provided with explosion-protection equipment 4 at the top of housing 13; On the inner chamber of housing 13, level is fixed with primary conductive bar 9; The cylinder that described primary conductive bar 9 is hollow, the two ends of primary conductive bar 9 all extend to the outside of housing 13; Two ends at primary conductive bar 9 are connected with respectively primary connection terminal 8;
Referring to Fig. 2, be wound with successively low-power measurement winding 11 and underpower protection winding 12 along the outer wall of primary conductive bar 9; Guarantee low-power measurement winding 11 and underpower protection winding 12 close contacts by hold down gag 6; Inner side at low-power measurement winding 11 and underpower protection winding 12 is provided with inner screening cylinder 7, outside at low-power measurement winding 11 and underpower protection winding 12 is provided with external shield cylinder 5, realizes the electromagnetic screen to low-power measurement winding 11 and underpower protection winding 12 by external shield cylinder 5 and the mutual fastening of inner screening cylinder 7;
Referring to Fig. 2, body parts is made up of winding support bar 14, radome 15 and external insulation casing pipe 16; The top of winding support bar 14 is connected with external shield cylinder 5, and on the shaft of winding support bar 14, cover has radome 15 and external insulation casing pipe 16 successively; The top of external insulation casing pipe 16 is connected with the bottom of housing 13;
Referring to Fig. 3, the box body structure that base member 18 is rectangle, the top of base 18 is connected with the bottom of winding support bar 14, the bottom of external insulation casing pipe 16 respectively; On base 18 end faces of 14 enclosing region of winding support bar, have through hole;
Referring to Fig. 3; at winding support bar, 14 bottom port places are provided with aviation terminal 19; by wire, low-power measurement winding 11 is connected with aviation terminal 19 respectively with underpower protection winding 12, wherein connects aviation terminal 19 and pass in the hollow cavity of winding support bar 14 with the wire of low-power measurement winding 11.
Referring to Fig. 3, in base member 18, be provided with secondary analog to digital converter 20, on the sidewall of base 18, be provided with fiber-optic output mouth 21; By wire, secondary digital to analog converter 20 is connected with aviation terminal 19, fiber-optic output mouth 21 gathers standard signal to pulpit for user.By electric wire, secondary digital to analog converter 20 is connected with the low-tension supply of base 18 outsides.
Referring to Fig. 3, on the bottom of the winding support bar 14 near base 18, be provided with sulfur hexafluoride gas drying agent 17.
Say further, low-power measurement winding 11 and underpower protection winding 12 are ironcore choke, and low-power measurement winding 11 and underpower protection winding 12 are all approximate loss-free; The analog quantity current signal that low-power measurement winding 11 and underpower protection winding 12 detect in the mode of electric current induction, by the wire that not disturbed by high-voltage electromagnetic, is sent to secondary digital to analog converter 20.
Say further; secondary analog to digital converter 20 be responsible for by transmit from low-power measurement winding 11 and underpower protection winding 12 the analog quantity current signal coming and be converted to digital signal; and by Optical Fiber Transmission to measurement in pulpit, metering, protective device, then by measurement in pulpit, metering, protective device, high-voltage circuit electric current is realized to metering, measurement and relay protection.
Say further, described explosion-protection equipment 4, is responsible for breaking down at product that to cause gaseous tension in housing 13 first cracked when too high, and the gas in housing 13 is discharged, and avoids housing 13, insulating sleeve 16 or base 18 that explosion occurs;
The material of described housing 13 is aluminium casting, is filled with sulfur hexafluoride insulating gas in housing 13;
Described external shield cylinder 5 and inner screening cylinder 7 have formed the assembly shielding of low-power measurement winding 11 and underpower protection winding 12; Primary conductive bar 9 passes from the geometric center of external shield cylinder 5 and inner screening cylinder 7, and the outside horizontal-extending in both sides, and stretches out housing 13.
A described conductor terminal 8 is serially connected on high-tension line.
Claims (6)
1. an electronic current mutual inductor, is made up of head assembly, body parts and base (18); The top of body parts is connected with head assembly, and the bottom of body parts is connected with base (18); Described head assembly is made up of explosion-protection equipment (4), external shield cylinder (5), hold down gag (6), inner screening cylinder (7), primary connection terminal (8), primary conductive bar (9), low-power measurement winding (11), underpower protection winding (12) and housing (13); Its middle shell (13) is the cylinder of upper end closure and hollow; Be provided with explosion-protection equipment (4) at the top of housing (13); On the inner chamber of housing (13), level is fixed with primary conductive bar (9); The cylinder that described primary conductive bar (9) is hollow, the two ends of primary conductive bar (9) all extend to the outside of housing (13); Be connected with respectively primary connection terminal (8) at the two ends of primary conductive bar (9); Be wound with successively low-power measurement winding (11) and underpower protection winding (12) along the outer wall of primary conductive bar (9); Guarantee low-power measurement winding (11) and underpower protection winding (12) close contact by hold down gag (6); Inner side at low-power measurement winding (11) and underpower protection winding (12) is provided with inner screening cylinder (7), outside at low-power measurement winding (11) and underpower protection winding (12) is provided with external shield cylinder (5), realizes the electromagnetic screen to low-power measurement winding (11) and underpower protection winding (12) by external shield cylinder (5) and the mutual fastening of inner screening cylinder (7); Described body parts is made up of winding support bar (14), radome (15) and external insulation casing pipe (16); The top of winding support bar (14) is connected with external shield cylinder (5), and on the shaft of winding support bar (14), cover has radome (15) and external insulation casing pipe (16) successively; The top of external insulation casing pipe (16) is connected with the bottom of housing (13); The box body structure that base (18) is rectangle, the top of base (18) is connected with the bottom of winding support bar (14), the bottom of external insulation casing pipe (16) respectively; On base (18) end face of winding support bar (14) institute enclosing region, have through hole;
It is characterized in that: at winding support bar (14), bottom port place is provided with aviation terminal (19), by wire, low-power measurement winding (11) is connected with aviation terminal (19) respectively with underpower protection winding (12), in base (18), be provided with secondary digital to analog converter (20), on the sidewall of base (18), be provided with fiber-optic output mouth (21); By wire, secondary digital to analog converter (20) is connected with aviation terminal (19), by optical fiber, secondary digital to analog converter (20) is connected with fiber-optic output mouth (21); By electric wire, secondary digital to analog converter (20) low-tension supply outside with base (18) is connected and power taking.
2. a kind of electronic current mutual inductor as claimed in claim 1; It is characterized in that: on the shaft of the winding support bar (14) near base (18), be provided with sulfur hexafluoride gas drying agent (17).
3. a kind of electronic current mutual inductor as claimed in claim 1; It is characterized in that: low-power measurement winding (11) and underpower protection winding (12) are ironcore choke, low-power measurement winding (11) and underpower protection winding (12) are all approximate loss-free; The analog quantity current signal that low-power measurement winding (11) and underpower protection winding (12) detect in the mode of electric current induction, by the wire that not disturbed by high-voltage electromagnetic, is sent to secondary digital to analog converter (20).
4. a kind of electronic current mutual inductor as claimed in claim 1; It is characterized in that: secondary analog to digital converter (20) be responsible for by be converted to digital signal from the analog quantity current signal of low-power measurement winding (11) and underpower protection winding (12) transmission; and arrive host computer by Optical Fiber Transmission, then by host computer, high-voltage circuit electric current is realized to metering, measurement and relay protection.
5. a kind of electronic current mutual inductor as claimed in claim 1; It is characterized in that: described explosion-protection equipment (4), be responsible for gaseous tension in housing (13) first cracked when too high, the gas in housing (13) is discharged, avoid housing (13), insulating sleeve (16) or base (18) that explosion occurs; The material of described housing (13) is aluminium casting, and housing is filled with sulfur hexafluoride insulating gas in (13); Described external shield cylinder (5) and inner screening cylinder (7) have formed the assembly shielding of low-power measurement winding (11) and underpower protection winding (12); Primary conductive bar (9) passes from the geometric center of external shield cylinder (5) and inner screening cylinder (7), and the outside horizontal-extending in both sides, and stretches out housing (13); A described conductor terminal (8) is serially connected on high-tension line.
6. a kind of electronic current mutual inductor as claimed in claim 1; It is characterized in that: the model that secondary analog to digital converter (20) adopts is AJY-E03.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320728384.XU CN203688621U (en) | 2013-11-19 | 2013-11-19 | Electronic current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320728384.XU CN203688621U (en) | 2013-11-19 | 2013-11-19 | Electronic current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203688621U true CN203688621U (en) | 2014-07-02 |
Family
ID=51010506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320728384.XU Expired - Lifetime CN203688621U (en) | 2013-11-19 | 2013-11-19 | Electronic current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203688621U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616546A (en) * | 2013-11-19 | 2014-03-05 | 国家电网公司 | Electronic current transformer |
| CN105225816A (en) * | 2015-10-21 | 2016-01-06 | 中国电力科学研究院 | A kind of current transformer with high voltage standard capacitor function |
-
2013
- 2013-11-19 CN CN201320728384.XU patent/CN203688621U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616546A (en) * | 2013-11-19 | 2014-03-05 | 国家电网公司 | Electronic current transformer |
| CN103616546B (en) * | 2013-11-19 | 2016-06-22 | 国家电网公司 | A kind of electronic current mutual inductor |
| CN105225816A (en) * | 2015-10-21 | 2016-01-06 | 中国电力科学研究院 | A kind of current transformer with high voltage standard capacitor function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140702 Effective date of abandoning: 20160622 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |