CN200979569Y - A protective three-phase power measuring box - Google Patents
A protective three-phase power measuring box Download PDFInfo
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- CN200979569Y CN200979569Y CN 200620140635 CN200620140635U CN200979569Y CN 200979569 Y CN200979569 Y CN 200979569Y CN 200620140635 CN200620140635 CN 200620140635 CN 200620140635 U CN200620140635 U CN 200620140635U CN 200979569 Y CN200979569 Y CN 200979569Y
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Abstract
A protector triphase power batch tank comprises a case for placing the dielectric oil, two voltage transformers, two current transformers, and insulating mediums between the case, the voltage transformers and the current transformers, wherein the primary terminals of the voltage transformers respectively connects the A phase with the B phase and the B phase with the C phase, the primary terminals of the current transformers are connected with the A and the C, the secondary terminals of the transformers are respectively connected with the secondary electric energy meter, the common lead-out terminal of the current transformers is connected with the B phase high-tension bushing wherein a high-voltage fuse is installed, the lower ends of the high-voltage fuse is connected with the common lead-out terminal of the current transformers while the upper end is connected with the high-voltage connection. The utility model provides a protector triphase power batch tank with the high safety and the low maintaining cost, which effectively prevents the excess current.
Description
(1) technical field
The utility model relates to electric protection device, especially a kind of three-phase power batch meter.
(2) background technology
At present on the electricity market, the extensive three-phase power batch meter that adopts, form by two current transformers, two mutual induction of voltage, three high voltage porcelain bushings, fuel tank and measurement instruments. record the voltage of circuit by voltage transformer (VT), the line current that records by current transformer, be connected with measurement instrument by terminal block, can be to the active power of high pressure three-phase alternating current, and reactive power is measured.
In 10kV three-phase high-voltage distribution line, when transmission and distribution line length is 1000M～5000M, ground capacitance 10uF magnitude; When 50Hz, the exciting current of voltage transformer (VT) is 1mA～5mA, therefore, and as easy as rolling off a log and line capacitance generation fundamental resonance, frequency multiplication resonance and Subharmonic Resonance.Can produce superpotential when fundamental resonance and frequency multiplication resonance take place, make the core sataration of voltage transformer (VT), exciting current increases severely; When Subharmonic Resonance took place, the induction reactance of voltage transformer (VT) reduced, and also produced very big exciting current.Test when showing resonance exciting current can reach 0.1A～0.5A, and the duration can be very long, cause winding overheated, cause and puncture even blast, bring very big threat to operation of power networks.Except the resonance excess current, because line over-voltage and product quality are bad, voltage transformer (VT) winding inter-turn and layer insulation also can break down, local overheating occurs, along with the fault zone constantly enlarges, exciting current also constantly increases, develop into winding and burn, cause phase fault to have a power failure.In order to reduce the line outage accident, some 10KV fuel tank formula electric metering boxes use fuse to connect a winding of voltage transformer (VT) as fuse element in fuel tank, when exciting current is increased to fuse failure unusually, voltage transformer (VT) is disconnected unlikely initiation line outage from circuit.Because fuse can not be by the batch sampling test after installing, the fusing current error is very big.Fuse is installed in the fuel tank, and the electric arc during fusing can cause the insulating oil gasification, increases the pressure of fuel tank, causes oil-spraying easily.In addition, can not change on the spot behind the fuse failure, need return factory and carry out oil processing, reinstall fuse then, increase plant maintenance workload and maintenance cost.
(3) summary of the invention
Can not effectively protect excess current, poor stability, deficiency that maintenance cost is high for what overcome existing three-phase power batch meter, the utility model provides a kind of can effectively avoid excess current, security is good, maintenance cost is low protection type three-phase power batch meter.
The technical scheme that its technical matters that solves the utility model adopts is:
A kind of protection type three-phase power batch meter, comprise the casing of placing insulating oil, two voltage transformer (VT), two current transformers, between casing and voltage transformer (VT), the current transformer insulating medium is arranged, two voltage transformer (VT) once terminate at A phase, B mutually between, B phase, C mutually between; Two current transformers once hold with A mutually, C is connected; The secondary terminals of two voltage transformer (VT), two current transformers is connected with the electric energy meter of secondary side respectively, the public leading-out terminal of described two current transformers inserts in the B phase high voltage porcelain bushing, in described B phase high voltage porcelain bushing, be provided with high-tension fuse, described high-tension fuse lower end is connected with the public leading-out terminal of two current transformers, and the upper end of described high-tension fuse is connected with high-voltage connection.
Further, the lower end of described high-tension fuse is provided with spring, the upper end of described high-tension fuse is provided with fuse base, fuse cover, described fuse base is fixed on the upper end of high voltage porcelain bushing, described fuse cover is installed in the inside of high voltage porcelain bushing lid, and described fuse cover is pushed down the upper end of high-tension fuse.
Further again, the lower end of described spring cover is pressed on the bolt, and in the described hole that is bolted to the high voltage porcelain bushing lower end, the bottom of bolt is connected and fixed nut, and described hold-down nut is connected with the public leading-out terminal of two current transformers.
Further, described spring is the spring of falling the pagoda-shaped.
Technical conceive of the present utility model is: burn out voltage transformer pt for preventing excess current, at voltage transformer (VT) primary line exit serial connection high-tension fuse, protect with high-tension fuse; Fusing in 30 seconds under the excess current value of regulation if surpass 30 seconds, is excised the circuit of fault automatically, can start and cut off power supply, avoids accident to take place.
Adopted the bushing of particular design mutually at the B of electric metering box, high-tension fuse is set in sleeve pipe, its structure is for to enclose insulation tube with fuse, and fills arc extinguishing silica sand in pipe, and technical parameter meets national standard.The external connection screw rod of stopping by fuse cover and bushing in the upper end of high-tension fuse is connected, the lower end is connected by the internal wiring bolt of lead spring and sleeve pipe bottom peace, and two voltage transformer (VT) are received on the connection bolt of outlet connection B phase sleeve pipe lower end of B phase.When the exciting current of voltage transformer (VT) reached the rated current of fuse, fuse fused at the appointed time, the electric arc that metallic vapour produces during fusing cut apart by silica sand and cool off after extinguish, can not pollute insulating oil.When changing high-tension fuse, as long as dismounting is casing cover, external connection screw rod and the fuse cover at bushing top down, after changing the high-tension fuse of a same specification, load onto fuse cover, external connection screw rod and casing cover again, just can put into operation again through preventive trial.
The beneficial effects of the utility model mainly show: 1, can effectively avoid excess current, security good; 2, has protective effect; 3, can not pollute insulating oil after the high-tension fuse action, be convenient to change on the spot fuse, make because the resonance excess current can come into operation in a short time again from the electric metering box that circuit disconnects.
(4) description of drawings
Fig. 1 is the structural drawing of three-phase power batch meter of the present utility model.
(5) embodiment
Below in conjunction with accompanying drawing the utility model is further described.
With reference to Fig. 1, a kind of protection type three-phase power batch meter, comprise the casing 9 of placing insulating oil, two voltage transformer pts 1, PT2, two current transformer CT1, CT2, between casing 9 and voltage transformer (VT), the current transformer insulating medium is arranged, the once end of two voltage transformer pts 1, PT2 be connected on respectively A phase, B mutually between, B phase, C mutually between; Two current transformer CT1, CT2 once hold with A mutually, C is connected; The secondary terminals of two voltage transformer (VT), two current transformers is connected with the electric energy meter of secondary side respectively, the public leading-out terminal of described two current transformers inserts in the B phase high voltage porcelain bushing, in described B phase high voltage porcelain bushing, be provided with high-tension fuse 4, described high-tension fuse 4 lower ends are connected with the public leading-out terminal of two current transformers, and the upper end of described high-tension fuse 4 is connected with high-voltage connection.
The lower end of described high-tension fuse 4 is provided with spring 5, the upper end of described high-tension fuse 4 is provided with fuse base 3, fuse cover 2, described fuse base 3 is fixed on the upper end of high voltage porcelain bushing 7, described fuse cover 2 is installed in the inside of high voltage porcelain bushing lid 7, and described fuse cover 2 is pushed down the upper end of high-tension fuse 4.The lower end cover of described spring 5 is pressed on the bolt 6, and described bolt 6 is fixed in the hole of high voltage porcelain bushing 7 lower ends, and the bottom of bolt 6 is connected and fixed nut 8, and described hold-down nut 8 is connected with the public leading-out terminal of two current transformers.Described spring 5 is the spring of falling the pagoda-shaped.
The concrete assembling process of present embodiment is: first voltage transformer pt 1, and its extension line end is A, B, and second mutual induction of voltage is PT2, and its extension line end is C, B, and B is public leading-out terminal, inserts in the B phase high voltage porcelain bushing.
B phase high pressure extension line adopted ￠ 12 * 390 red copper bars originally, one is processed into screw thread, be fixed on the high voltage porcelain bushing, present embodiment is cancelled ￠ 12 * 390 red copper bars, its position is for high-tension fuse 4 is installed, the lower end of high-tension fuse 4 stainless steel spring steel wire of ￠ 1.2, be processed into the spring of falling the pagoda-shaped 5, the stroke of spring 5 is 20mm, the first lap cover of this spring is pressed on the bolt 6 of M8 * 70, this is bolted in the hole of ￠ 9 of B phase high voltage porcelain bushing, under use nut 8, brass plain washer 7, spring washer 9 is tightened, the burn-on B end extension line (being public leading-out terminal) of voltage transformer (VT) of brass plain washer, the last end structure of high-tension fuse 4: high-tension fuse seat 3 usefulness poured with epoxy resin are fixed on the upper end of B phase high voltage porcelain bushing, endoporus is processed into the box thread of M36, high-tension fuse lid 2 is contained in the inside of insulator lid, external diameter is processed into the external thread of M36, endoporus is pushed down an end of high-tension fuse, external thread is tightened the high-tension fuse seat, with spring, high-tension fuse and high-tension fuse lid three compress, and guarantee that contact is reliable.High-tension fuse covers the threaded hole of a M12 of processing, Binding post/stud 1 is screwed into 4/5ths, 1/5th, weld with brazing, load onto the high voltage porcelain bushing lid above successively, O-ring seal, clinching, B phase letter card, packing ring, spring washer and three copper nuts are used for high-voltage connection.
When the exciting current of voltage transformer (VT) reached the rated current of fuse, the fuse of high-tension fuse 4 fused at the appointed time, the electric arc that metallic vapour produces during fusing cut apart by silica sand and cool off after extinguish, can not pollute insulating oil.When changing high-tension fuse 4, as long as dismounting is casing cover, external connection screw rod and the fuse cover at bushing top down, after changing the high-tension fuse of a same specification, load onto fuse cover, external connection screw rod and casing cover again, just can put into operation again through preventive trial.
The three-phase high-voltage electric power batch meter of interior dress high-tension fuse 4 is the same with common three-phase high-voltage batch meter profile, and mounting means is constant, and the mode of connection is constant, guarantees that product can safe operation.
Claims (4)
1, a kind of protection type three-phase power batch meter, comprise the casing of placing insulating oil, two voltage transformer (VT), two current transformers, between casing and voltage transformer (VT), the current transformer insulating medium is arranged, the once end of two voltage transformer (VT) be connected on respectively A phase, B mutually between, B phase, C mutually between; Two current transformers once hold with A mutually, C is connected; The secondary terminals of two voltage transformer (VT), two current transformers is connected with the electric energy meter of secondary side respectively, the public leading-out terminal of described two current transformers inserts in the B phase high voltage porcelain bushing, it is characterized in that: in described B phase high voltage porcelain bushing, be provided with high-tension fuse, described high-tension fuse lower end is connected with the public leading-out terminal of two current transformers, and the upper end of described high-tension fuse is connected with high-voltage connection.
2, protection type three-phase power batch meter as claimed in claim 1; it is characterized in that: the lower end of described high-tension fuse is provided with spring; the upper end of described high-tension fuse is provided with fuse base, fuse cover; described fuse base is fixed on the upper end of high voltage porcelain bushing; described fuse cover is installed in the inside of high voltage porcelain bushing lid, and described fuse cover is pushed down the upper end of high-tension fuse.
3, protection type three-phase power batch meter as claimed in claim 2; it is characterized in that: the lower end cover of described spring is pressed on the bolt; in the described hole that is bolted to the high voltage porcelain bushing lower end; the bottom of bolt is connected and fixed nut, and described hold-down nut is connected with the public leading-out terminal of two current transformers.
4, as claim 2 or 3 described protection type three-phase power batch meters, it is characterized in that: described spring is the spring of falling the pagoda-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620140635 CN200979569Y (en) | 2006-12-01 | 2006-12-01 | A protective three-phase power measuring box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620140635 CN200979569Y (en) | 2006-12-01 | 2006-12-01 | A protective three-phase power measuring box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200979569Y true CN200979569Y (en) | 2007-11-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620140635 Expired - Fee Related CN200979569Y (en) | 2006-12-01 | 2006-12-01 | A protective three-phase power measuring box |
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| CN (1) | CN200979569Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435801A (en) * | 2011-10-25 | 2012-05-02 | 浙江华彩科技有限公司 | Three-phase and thee-wire system high-voltage energy meter adopting combined instrument transformer |
| CN107359037A (en) * | 2017-05-27 | 2017-11-17 | 安徽华能集团电器有限公司 | A kind of 10kv open airs combination voltage transformer |
| CN108535525A (en) * | 2018-07-05 | 2018-09-14 | 湘潭市长诚互感器有限责任公司 | A kind of outdoor two elements three-phase power metering box of band protection |
| CN110441568A (en) * | 2019-08-30 | 2019-11-12 | 陈劲游 | A kind of phase three-wire three high-voltage electric energy metering box of four fuses |
-
2006
- 2006-12-01 CN CN 200620140635 patent/CN200979569Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435801A (en) * | 2011-10-25 | 2012-05-02 | 浙江华彩科技有限公司 | Three-phase and thee-wire system high-voltage energy meter adopting combined instrument transformer |
| CN107359037A (en) * | 2017-05-27 | 2017-11-17 | 安徽华能集团电器有限公司 | A kind of 10kv open airs combination voltage transformer |
| CN108535525A (en) * | 2018-07-05 | 2018-09-14 | 湘潭市长诚互感器有限责任公司 | A kind of outdoor two elements three-phase power metering box of band protection |
| CN110441568A (en) * | 2019-08-30 | 2019-11-12 | 陈劲游 | A kind of phase three-wire three high-voltage electric energy metering box of four fuses |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071121 Termination date: 20141201 |
|
| EXPY | Termination of patent right or utility model |