CN204666700U - A kind of straight-through current transformer - Google Patents
A kind of straight-through current transformer Download PDFInfo
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- CN204666700U CN204666700U CN201520397810.5U CN201520397810U CN204666700U CN 204666700 U CN204666700 U CN 204666700U CN 201520397810 U CN201520397810 U CN 201520397810U CN 204666700 U CN204666700 U CN 204666700U
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Abstract
The utility model discloses a kind of straight-through current transformer, comprise: the first toroidal core, the second toroidal core, primary current line, secondary current line and treatment circuit, described primary current wire-wound is formed on the first toroidal core and the second toroidal core, and secondary current line passes the center of the first toroidal core and the second toroidal core; Treatment circuit comprises sampled signal change-over circuit and amplifying circuit, the input end of described sampled signal change-over circuit and one is sampled winding switching, sampling winding technique is on the first toroidal core, the output terminal of sampled signal change-over circuit is connected with the input end of amplifying circuit, the output terminal of amplifying circuit and one exports winding switching, exports winding technique on the second toroidal core.The utility model realizes larger range of current output and larger loading range, only needs an electric current gear, avoids numerous and diverse multiple current gear, realizes compensating dynamically secondary current line by sampling winding, treatment circuit and output winding.
Description
Technical field
The utility model relates to a kind of straight-through current transformer.
Background technology
At present, the builtin voltage mutual inductor of most of high-voltage electric energy meter and the Same Name of Ends of current transformer, at inner short circuit, externally only have a connection terminal.Like this, when examining and determine high-voltage electric energy meter, current measurement circuit and voltage measurement circuit are connected, and cannot separate, and so will cause current measurement circuit also can with high pressure.
But, with regard to current electronic devices and components, be cannot directly bear 10kV high pressure, and output 600A electric current, therefore, current current source is all carry out high_voltage isolation and electric current up-flow by a high-voltage great-current mutual inductor.
But, for the measuring requirement of high-voltage electric energy meter, this high-voltage great-current mutual inductor needs the range of current output of at least 0.1mA-600A, at least the load fan-out capability of the every epi-position of 400VA, and the withstand voltage level of more than 18kV, and higher precision level can also be ensured.For reaching These parameters, current high-voltage great-current great majority are all primary current line and secondary current line is multi-turn structure, electric current gear is various, primary current line and secondary current line, the 18KV of circuit board section and secondary current line is withstand voltage needs multilayer to isolate (such as: high voltage connector is isolated by medium voltage contactor, isolated by lv contactor again, then isolated by auxiliary reclay, isolated on circuit board by miniature relay).Not only loaded down with trivial details to the isolation that 18kV is withstand voltage, reliability is not high, and stability is inadequate, and precision level is also difficult to ensure.
And current most of high-voltage great-current mutual inductor output terminals adopt the connection of terminals minor, at 600A electric current through out-of-date, easily heating is hot, if connection terminal does not have good contact, also can burn connection terminal, cause unnecessary loss.
Utility model content
In order to overcome the deficiencies in the prior art, the purpose of this utility model is to provide a kind of high precision, larger range of current output and larger loading range straight-through current transformer.
For solving the problem, the technical scheme that the utility model adopts is as follows:
A kind of straight-through current transformer, comprise: the first toroidal core, the second toroidal core, primary current line, secondary current line and treatment circuit, described primary current wire-wound is formed on the first toroidal core and the second toroidal core, and secondary current line passes the center of the first toroidal core and the second toroidal core; Treatment circuit comprises sampled signal change-over circuit and amplifying circuit, the input end of described sampled signal change-over circuit and one is sampled winding switching, sampling winding technique is on the first toroidal core, the output terminal of sampled signal change-over circuit is connected with the input end of amplifying circuit, the output terminal of amplifying circuit and one exports winding switching, exports winding technique on the second toroidal core;
Described sampling winding, for producing corresponding induction current according to the magnetic flux on the first toroidal core, and exports sampled signal change-over circuit to; Described sampled signal change-over circuit, is converted to voltage signal for the signal exported by sampling winding and exports amplifying circuit to; Described amplifying circuit, exports output winding to for carrying out amplification to the voltage signal received; Described output winding, to be afforded redress electric current to secondary current line for the voltage signal that exported by amplifying circuit by the second toroidal core.
Preferably, described amplifying circuit comprises: operational amplifier U3, operational amplifier U4, operational amplifier U5 and integrated power amplifier U7, the end of oppisite phase of described operational amplifier U5 is connected with the output terminal of sampled signal change-over circuit by resistance R22, the in-phase end of operational amplifier U5 is connected with the output terminal of operational amplifier U3 by resistance R12, and the output terminal of operational amplifier U5 is connected with the end of oppisite phase of integrated power amplifier U7 by resistance R17, the in-phase end ground connection of integrated power amplifier U7, the output terminal of integrated power amplifier U7 is connected with the one end exporting winding by resistance R23, it is the output terminal of amplifying circuit between resistance R23 and the one end exporting winding, the other end exporting winding is connected with the end of oppisite phase of integrated power amplifier U7 by resistance R18, the other end exporting winding is also connected with the end of oppisite phase of operational amplifier U4 by resistance R8, the in-phase end ground connection of operational amplifier U4, the output terminal of operational amplifier U4 is connected with the end of oppisite phase of operational amplifier U3 by resistance R7, the in-phase end ground connection of operational amplifier U3.
Preferably, described treatment circuit also comprises overload open loop protection circuit, and overload open loop protection circuit, for detecting the output voltage of amplifying circuit, will export short circuit in winding when the output voltage of amplifying circuit is greater than preset value, the output of the amplifying circuit that breaks.
Preferably, described amplifying circuit comprises: operational amplifier U3, operational amplifier U4, operational amplifier U5 and integrated power amplifier U7; Described overload open loop protection circuit comprises: resistance R3, voltage comparator U1, voltage comparator U2, resistance R25, triode Q1, relay K 1 and diode D3;
The end of oppisite phase of described operational amplifier U5 is connected with the output terminal of sampled signal change-over circuit by resistance R22, the in-phase end of operational amplifier U5 is connected with the output terminal of operational amplifier U3 by resistance R12, and the output terminal of operational amplifier U5 is connected with the end of oppisite phase of integrated power amplifier U7 by resistance R17, the in-phase end ground connection of integrated power amplifier U7, the output terminal of integrated power amplifier U7 is connected with the one end exporting winding by resistance R23, it is the output terminal of amplifying circuit between resistance R23 and the one end exporting winding, the other end exporting winding is connected with the moving contact of relay K 1, the normally opened contact of relay K 1 is connected with the end of oppisite phase of integrated power amplifier U7 by resistance R18, the normally opened contact of relay K 1 is also connected with the end of oppisite phase of operational amplifier U4 by resistance R8, the normally closed contact of relay K 1 is connected with the output terminal of amplifying circuit, the in-phase end ground connection of operational amplifier U4, the output terminal of operational amplifier U4 is connected with the end of oppisite phase of operational amplifier U3 by resistance R7, the in-phase end ground connection of operational amplifier U3,
One end of resistance R3 is connected with the output terminal of integrated power amplifier U7, the other end of resistance R3 is connected with the in-phase end of voltage comparator U1 and the end of oppisite phase of voltage comparator U2 respectively, the end of oppisite phase of voltage comparator U1 accesses negative DC voltage end by resistance R2 and passes through resistance R1 ground connection, the in-phase end of voltage comparator U2 accesses direct-flow positive voltage end by resistance R10 and passes through resistance R9 ground connection, voltage comparator U1 is connected with resistance R25 respectively with the output terminal of voltage comparator U2, the other end of resistance R25 is connected with the base stage of triode Q1, the grounded emitter of triode Q1, the collector of triode Q1 is connected with coil one end of relay K 1 and the positive pole of diode D3 respectively, the negative pole of triode D3 is connected with the coil other end of relay K 1, the coil other end access DC power supply terminal of relay K 1.
Preferably, described secondary current line is sheathed on the center also passing the first toroidal core and the second toroidal core in high-voltage insulating tube.
Preferably, the outer wall of described high-voltage insulating tube is enclosed with Copper Foil, and this Copper Foil ground connection.
Preferably, described primary current line utilizes high pressure casting glue to carry out embedding.
Preferably, described first toroidal core is the ultracrystallite toroidal core of simplex winding.
Preferably, described second toroidal core is the silicon steel sheet annular magnetic core of simplex winding.
Compared to existing technology, the beneficial effects of the utility model are: 1, realize larger range of current output and larger loading range, only need an electric current gear, avoid numerous and diverse multiple current gear, and high_voltage isolation part are simple for structure; 2, realize compensating dynamically secondary current line by sampling winding, treatment circuit and output winding, make the ampere turns of secondary current line equal with the ampere turns of primary current line; 3, there is not capacitive leakage problem in primary current line and secondary current line; 4, the utility model increases overload open loop protection circuit, realizes will exporting short circuit in winding, the output of disconnection process circuit when the situation of overload or open circuit occurs secondary current line, and can not impact the electric current in primary current line; 5, secondary current line adopts punching structure, easily realizes the high_voltage isolation of high-voltage secondary current line and low pressure primary current line and treatment circuit.6, straight-through current transformer volume and weight of the present utility model is all less, and line construction is simple, is convenient to Installation and Debugging.
Accompanying drawing explanation
Fig. 1 is the structural drawing of the straight-through current transformer of the utility model preferred embodiment.
Fig. 2 is the circuit structure diagram of the treatment circuit of the utility model preferred embodiment.
Embodiment
Below, by reference to the accompanying drawings and embodiment, the utility model is described further:
With reference to figure 1 and Fig. 2, a kind of straight-through current transformer, comprise: the first toroidal core 1, second toroidal core 2, primary current line 3, secondary current line 4 and treatment circuit, primary current line 3 is wound on the first toroidal core 1 and the second toroidal core 2, and secondary current line 3 passes the center of the first toroidal core 1 and the second toroidal core 2; Treatment circuit comprises sampled signal change-over circuit, amplifying circuit and overload open loop protection circuit; the input end and one of sampled signal change-over circuit winding 5 of sampling is connected; sampling winding 5 is wound on the first toroidal core 1; the output terminal of sampled signal change-over circuit is connected with the input end of amplifying circuit; the output terminal and one of amplifying circuit exports winding 6 and is connected, and exports winding 6 and is wound on the second toroidal core 2.
First toroidal core 1 is preferably the ultracrystallite toroidal core of a simplex winding, and the second toroidal core 2 is preferably the silicon steel sheet annular magnetic core of simplex winding.Primary current line 3 utilizes high pressure casting glue to carry out embedding, and secondary current line 4 is sheathed on the center also passing the first toroidal core 1 and the second toroidal core 2 in high-voltage insulating tube.The number of turn of sampling winding 5 is generally more than 500 circles, and the induction current of generation is also very little, and winding 5 of therefore sampling has an impact to the electric current in primary current line 3 hardly.
Sampled signal change-over circuit comprises resistance R5, diode D1, diode D2, electric capacity C4, resistance R14 and operational amplifier U6, the two ends of resistance R5 are connected with the two ends of sampling winding 5 respectively, diode D1, diode D2, electric capacity C4 and resistance R14 are for being connected in parallel, and the positive pole of diode D1 is connected with resistance R5, the negative pole of diode D2 is connected with resistance R5, one end of resistance R14 is connected with the end of oppisite phase of operational amplifier U6, the other end of resistance R14 is connected with the output terminal of operational amplifier U6, the in-phase end ground connection of operational amplifier U6.This sampled signal change-over circuit is the circuit that electric current is converted to voltage by a classical employing operational amplifier, can reduce the impact that sampling winding 5 produces primary current line 3 so further.
Amplifying circuit mainly comprises operational amplifier U3, operational amplifier U4, operational amplifier U5 and integrated power amplifier U7, and overload open loop protection circuit comprises: resistance R3, voltage comparator U1, voltage comparator U2, resistance R25, triode Q1, relay K 1 and diode D3.Concrete, the end of oppisite phase of operational amplifier U5 is connected with the output terminal of sampled signal change-over circuit by resistance R22, namely be connected with the output terminal of operational amplifier U6, the output terminal of operational amplifier U5 is connected with the end of oppisite phase of integrated power amplifier U7 by resistance R17, the in-phase end of integrated power amplifier U7 is by resistance R24 ground connection, the output terminal of integrated power amplifier U7 is connected with the one end exporting winding 6 by resistance R23, export the other end of winding 6 to be connected with the moving contact (contact 3 in Fig. 2) of relay K 1, the normally opened contact (contact 5 in Fig. 2) of relay K 1 is connected with the end of oppisite phase of integrated power amplifier U7 by resistance R8, normally opened contact is also connected with the end of oppisite phase of operational amplifier U4 by resistance R8, normally opened contact is also by resistance R15 ground connection, the normally closed contact (contact 4 in Fig. 2) of relay K 1 is connected with the output terminal of amplifying circuit, the output terminal of amplifying circuit is between resistance R23 and the one end exporting winding 6.
The in-phase end of operational amplifier U4 is by resistance R13 ground connection, the output terminal of operational amplifier U4 is connected with the end of oppisite phase of operational amplifier U3 by resistance R7, the in-phase end of operational amplifier U3 is by the resistance R11 of connection parallel with one another and electric capacity C3 ground connection, the output terminal of operational amplifier U3 is connected with the in-phase end of operational amplifier U5 by resistance R12, and the in-phase end of operational amplifier U5 is also by electric capacity C5 and the resistance R19 ground connection of connection parallel with one another.In addition, resistance R20 and electric capacity C7 is also parallel with between the end of oppisite phase of operational amplifier U5 and output terminal, resistance R6 and electric capacity C1 is also parallel with between the end of oppisite phase of operational amplifier U4 and output terminal, resistance R4 and electric capacity C2 is also parallel with between the end of oppisite phase of operational amplifier U3 and output terminal, the negative power end of integrated power amplifier U7 is also connected with the positive pole of diode D4, the negative pole of diode D4 is connected with the output terminal of amplifying circuit, the positive power source terminal of integrated power amplifier U7 is also connected with the negative pole of diode D5, the positive pole of diode D5 is connected with the output terminal of amplifying circuit.
The output terminal of integrated power amplifier U7 is also connected with one end of a resistance R3, the other end of resistance R3 connects the in-phase end of voltage comparator U1 and the end of oppisite phase of voltage comparator U2 respectively, the end of oppisite phase of voltage comparator U1 accesses negative DC voltage end by resistance R2 and passes through resistance R1 ground connection, the in-phase end of voltage comparator U2 accesses direct-flow positive voltage end by resistance R10 and passes through resistance R9 ground connection, voltage comparator U1 is connected with resistance R25 respectively with the output terminal of voltage comparator U2, the other end of resistance R25 is connected with the base stage of triode Q1, the grounded emitter of triode Q1, the collector of triode Q1 is connected with coil one end of relay K 1 and the positive pole of diode D3 respectively, the negative pole of triode D3 is connected with the coil other end of relay K 1, the coil other end access DC power supply terminal of relay K 1.
In conjunction with circuit structure and Fig. 2 of above-mentioned amplifying circuit, this amplifying circuit can realize one is carried out larger multiple amplification to the voltage signal in rated frequency range, such as the voltage signal of 45HZ-55HZ or 55HZ-65HZ is carried out to the amplification of larger multiple, and the voltage signal of other frequency is also had to the amplification of certain multiple.It should be noted that, export winding 6 between the output terminal and feedback resistance R18 of integrated power amplifier U7, can ensure that the load on the phase place of the output current of integrated power amplifier U7 and secondary current line 4 has nothing to do like this, an output feedack point AG1 of integrated power amplifier U7 is positioned at one end of resistance R8, then access operational amplifier U4 oppositely to amplify, then carry out positive feedback through the in-phase end that the reverse amplification of operational amplifier U3 is input to operational amplifier U5.According to the demand of practical application, the number of turn exporting winding 6 can change, and multiple second toroidal core 2 parallel connection also can be used to use.
Overload open loop protection circuit utilizes the coil break-make in relay K 1, controls moving contact and contacts with normally closed contact or contact with normally opened contact.When overload or open circuit phenomenon occur in the load of secondary current line 4, moving contact contacts with normally closed contact, makes output winding 6 short circuit, the output of the amplifying circuit that breaks.
The principle of work of straight-through current transformer of the present utility model is as follows: general primary current line is as feeder ear, and secondary current line connects load, such as, connect high-voltage electric energy meter and detect.When the ampere turns of primary current line 3 and the ampere turns of secondary current line 4 unequal time, magnetic flux can be produced in the first toroidal core 1, and then sampling winding 5 can produce induction current.When the ampere turns of secondary current line 4 is less than the ampere turns of primary current line 3, sampling winding 5 can produce the signal of positive, by sampled signal change-over circuit and amplifying circuit, the offset current of a positive is provided to secondary current line 4 by output winding 6, increases the ampere turns of secondary current line 4; When the ampere turns of secondary current line 4 is greater than the ampere turns of primary current line 3, sampling winding 5 can produce the signal of negative, by sampled signal change-over circuit and amplifying circuit, the offset current of a negative is provided to secondary current line 4 by output winding 6, reduces the ampere turns of secondary current line 4.Thus form a balance dynamically, make the ampere turns of secondary current line 4 equal the ampere turns of primary current line 3.In addition, when the output voltage of integrated power amplifier U7 is excessive, represent that the load on secondary current line 4 is excessive, namely may transship or open a way, now the Parallel opertation point JZC of voltage comparator U1 and U2 is low level, thus make relay K 1 disconnect the connection of moving contact and normally opened contact, and moving contact is connected with normally closed contact, then export winding 6 to be shorted, for the electric current in primary current line 3 provides the secondary current loop of a super-low impedance (short circuit), the output loop of amplifying circuit is also disconnected.When the output voltage of integrated power amplifier U7 is in specified scope, namely time normal, the Parallel opertation point JZC of voltage comparator U1 and U2 is high level, and the moving contact of relay K 1 is connected with normally opened contact, and now amplifying circuit can produce offset current on output winding 6.
In addition, the secondary current line 4 of straight-through current transformer of the present utility model is high pressure resistant part, and secondary current line 4 is sheathed in high-voltage insulating tube, is also wrapped in Copper Foil at the outer wall of high-voltage insulating tube, and access the earth, secondary current line 4 can bear the high pressure of 18KV.And secondary current line 4 employing is punching structure, easily realizes the high_voltage isolation of high-voltage secondary current line 4 and low pressure primary current line 3 and treatment circuit part.
Further, in treatment circuit part, the structure of sampled signal change-over circuit is not limited to the circuit structure in Fig. 2, as long as the signal of sampling winding 5 can be realized to be converted to directly proportional voltage signal; The structure of amplifying circuit is also not limited to the circuit structure in Fig. 2, realizes amplifying this basic function to the voltage signal in rated frequency range as long as meet.Primary current line and the turn ratio of secondary current line are also needs according to practical application and arrange the different turn ratioes.
The utility model has the advantage of: 1, realize larger range of current output and larger loading range, only need an electric current gear, avoid numerous and diverse multiple current gear, and high_voltage isolation part is simple for structure; 2, realize compensating dynamically secondary current line by sampling winding, treatment circuit and output winding, make the ampere turns of secondary current line equal with the ampere turns of primary current line; 3, there is not capacitive leakage problem in primary current line and secondary current line; 4, the utility model increases overload open loop protection circuit, realizes will exporting short circuit in winding, the output of disconnection process circuit when the situation of overload or open circuit occurs secondary current line, and can not impact the electric current in primary current line; 5, secondary current line adopts punching structure, easily realizes the high_voltage isolation of high-voltage secondary current line and low pressure primary current line and treatment circuit.6, straight-through current transformer volume and weight of the present utility model is all less, and line construction is simple, is convenient to Installation and Debugging.
To one skilled in the art, according to technical scheme described above and design, other various corresponding change and deformation can be made, and all these change and deformation all should belong within the protection domain of the utility model claim.
Claims (9)
1. a straight-through current transformer, it is characterized in that, comprise: the first toroidal core, the second toroidal core, primary current line, secondary current line and treatment circuit, described primary current wire-wound is formed on the first toroidal core and the second toroidal core, and secondary current line passes the center of the first toroidal core and the second toroidal core; Treatment circuit comprises sampled signal change-over circuit and amplifying circuit, the input end of described sampled signal change-over circuit and one is sampled winding switching, sampling winding technique is on the first toroidal core, the output terminal of sampled signal change-over circuit is connected with the input end of amplifying circuit, the output terminal of amplifying circuit and one exports winding switching, exports winding technique on the second toroidal core;
Described sampling winding, for producing corresponding induction current according to the magnetic flux on the first toroidal core, and exports sampled signal change-over circuit to; Described sampled signal change-over circuit, is converted to voltage signal for the signal exported by sampling winding and exports amplifying circuit to; Described amplifying circuit, exports output winding to for carrying out amplification to the voltage signal received; Described output winding, to be afforded redress electric current to secondary current line for the voltage signal that exported by amplifying circuit by the second toroidal core.
2. straight-through current transformer according to claim 1, it is characterized in that, described amplifying circuit comprises: operational amplifier U3, operational amplifier U4, operational amplifier U5 and integrated power amplifier U7, the end of oppisite phase of described operational amplifier U5 is connected with the output terminal of sampled signal change-over circuit by resistance R22, the in-phase end of operational amplifier U5 is connected with the output terminal of operational amplifier U3 by resistance R12, and the output terminal of operational amplifier U5 is connected with the end of oppisite phase of integrated power amplifier U7 by resistance R17, the in-phase end ground connection of integrated power amplifier U7, the output terminal of integrated power amplifier U7 is connected with the one end exporting winding by resistance R23, it is the output terminal of amplifying circuit between resistance R23 and the one end exporting winding, the other end exporting winding is connected with the end of oppisite phase of integrated power amplifier U7 by resistance R18, the other end exporting winding is also connected with the end of oppisite phase of operational amplifier U4 by resistance R8, the in-phase end ground connection of operational amplifier U4, the output terminal of operational amplifier U4 is connected with the end of oppisite phase of operational amplifier U3 by resistance R7, the in-phase end ground connection of operational amplifier U3.
3. straight-through current transformer according to claim 1; it is characterized in that; described treatment circuit also comprises overload open loop protection circuit; overload open loop protection circuit is for detecting the output voltage of amplifying circuit; short circuit in winding will be exported, the output of the amplifying circuit that breaks when the output voltage of amplifying circuit is greater than preset value.
4. straight-through current transformer according to claim 3, is characterized in that, described amplifying circuit comprises: operational amplifier U3, operational amplifier U4, operational amplifier U5 and integrated power amplifier U7; Described overload open loop protection circuit comprises: resistance R3, voltage comparator U1, voltage comparator U2, resistance R25, triode Q1, relay K 1 and diode D3;
The end of oppisite phase of described operational amplifier U5 is connected with the output terminal of sampled signal change-over circuit by resistance R22, the in-phase end of operational amplifier U5 is connected with the output terminal of operational amplifier U3 by resistance R12, and the output terminal of operational amplifier U5 is connected with the end of oppisite phase of integrated power amplifier U7 by resistance R17, the in-phase end ground connection of integrated power amplifier U7, the output terminal of integrated power amplifier U7 is connected with the one end exporting winding by resistance R23, it is the output terminal of amplifying circuit between resistance R23 and the one end exporting winding, the other end exporting winding is connected with the moving contact of relay K 1, the normally opened contact of relay K 1 is connected with the end of oppisite phase of integrated power amplifier U7 by resistance R18, the normally opened contact of relay K 1 is also connected with the end of oppisite phase of operational amplifier U4 by resistance R8, the normally closed contact of relay K 1 is connected with the output terminal of amplifying circuit, the in-phase end ground connection of operational amplifier U4, the output terminal of operational amplifier U4 is connected with the end of oppisite phase of operational amplifier U3 by resistance R7, the in-phase end ground connection of operational amplifier U3,
One end of resistance R3 is connected with the output terminal of integrated power amplifier U7, the other end of resistance R3 is connected with the in-phase end of voltage comparator U1 and the end of oppisite phase of voltage comparator U2 respectively, the end of oppisite phase of voltage comparator U1 accesses negative DC voltage end by resistance R2 and passes through resistance R1 ground connection, the in-phase end of voltage comparator U2 accesses direct-flow positive voltage end by resistance R10 and passes through resistance R9 ground connection, voltage comparator U1 is connected with resistance R25 respectively with the output terminal of voltage comparator U2, the other end of resistance R25 is connected with the base stage of triode Q1, the grounded emitter of triode Q1, the collector of triode Q1 is connected with coil one end of relay K 1 and the positive pole of diode D3 respectively, the negative pole of triode D3 is connected with the coil other end of relay K 1, the coil other end access DC power supply terminal of relay K 1.
5. straight-through current transformer according to claim 1, is characterized in that, described secondary current line is sheathed on the center also passing the first toroidal core and the second toroidal core in high-voltage insulating tube.
6. straight-through current transformer according to claim 5, is characterized in that, the outer wall of described high-voltage insulating tube is enclosed with Copper Foil, and this Copper Foil ground connection.
7. straight-through current transformer according to claim 1, is characterized in that, described primary current line utilizes high pressure casting glue to carry out embedding.
8. straight-through current transformer according to claim 1, is characterized in that, described first toroidal core is the ultracrystallite toroidal core of simplex winding.
9. straight-through current transformer according to claim 1, is characterized in that, described second toroidal core is the silicon steel sheet annular magnetic core of simplex winding.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520397810.5U CN204666700U (en) | 2015-06-10 | 2015-06-10 | A kind of straight-through current transformer |
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| CN201520397810.5U CN204666700U (en) | 2015-06-10 | 2015-06-10 | A kind of straight-through current transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104897940A (en) * | 2015-06-10 | 2015-09-09 | 广州今闰能源科技有限公司 | Straight-through current transformer |
| CN110492475A (en) * | 2019-07-24 | 2019-11-22 | 中石化南京工程有限公司 | A kind of distribution system |
-
2015
- 2015-06-10 CN CN201520397810.5U patent/CN204666700U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104897940A (en) * | 2015-06-10 | 2015-09-09 | 广州今闰能源科技有限公司 | Straight-through current transformer |
| CN110492475A (en) * | 2019-07-24 | 2019-11-22 | 中石化南京工程有限公司 | A kind of distribution system |
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