CN207265643U - A kind of protector of current mutual inductor - Google Patents
A kind of protector of current mutual inductor Download PDFInfo
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- CN207265643U CN207265643U CN201721324966.6U CN201721324966U CN207265643U CN 207265643 U CN207265643 U CN 207265643U CN 201721324966 U CN201721324966 U CN 201721324966U CN 207265643 U CN207265643 U CN 207265643U
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- protector
- circuit
- mutual inductor
- current mutual
- varistor
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Abstract
It the utility model is related to medium voltage switching technology field, more particularly to a kind of protector of current mutual inductor.A kind of protector of current mutual inductor, including three single-phase circuits, in the single-phase circuit, the circuit that is made of at least one current transformer connecting terminal Jx1 and a varistor RVx1, it is characterised in that：The varistor RVx1 concatenates capacitance-resistance respectively（Rx1、Cx1）After circuit and resistance Rx2, then by series capacitance Cx2 V1 ends are followed by, form x phase current mutual inductor protective loops.The utility model protector of current mutual inductor has the advantages that the course of work is more stable.
Description
Technical field
It the utility model is related to medium voltage switching technology field, more particularly to a kind of protector of current mutual inductor.
Background technology
Current transformer（CT, Current Transformer）It is according to electromagnetic induction principle, by high-tension primary side
High current is converted into secondary side low current, to measure the instrument of electric current.Current transformer is made of the iron core and winding closed.
Its first side winding number of turn is seldom, goes here and there in the circuit for the electric current for needing to measure.
In the prior art, protector of current mutual inductor is usually in secondary loop of mutual inductor, varistor in parallel,
As shown in Figure 1.If being not added with the varistor, in the case that broken string occurs in secondary circuit, current transformer inner-core can mistake
Spend saturated magnetization, heating burnout coil.The high pressure of secondary side can also impact the safety problem of the person and other equipments.When
Install varistor additional（Such as Fig. 1：RB1, RB2, RB3）Afterwards, when circuit works normally, varistor is in the high resistant shape of approximate open circuit
State；At this time, by Leakage Current≤1mA of varistor, the influence of accuracy of the electric current to circuit, can be ignored.
In the case of second open circuit, varistor moment enters overvoltage condition, when the current increases, can be effectively suppressed.
According to the different qualities of varistor, voltage can be suppressed in certain scope, avoid the harm of overvoltage.
But in the prior art, by the protector of current mutual inductor for installing varistor additional, however it remains following to lack
Point：
1st, simple piezoresistor type CT protections conducting electric discharge decompression belongs to passive decompression, and the insulation to equipment is still made
Into the possibility of damage.
2nd, leakage current caused by low-voltage, the aging of meeting accelerator.
3rd, varistor is non-linear larger（Dynamic electric resistor is larger）, discharge performance is unstable.
Utility model content
The shortcomings that for the above-mentioned prior art, the purpose of this utility model are to provide a kind of protector of current mutual inductor,
The output voltage of Current Transformer Secondary side can not only effectively be suppressed, and can ensure the stability of electric discharge.
To achieve these goals, the technical solution of the utility model is as follows：
A kind of protector of current mutual inductor, including three single-phase circuits, in the single-phase circuit, by least one electric current
The circuit of wire connecting terminal of transformer Jx1 and a varistor RVx1 composition, it is characterised in that：The varistor RVx1 difference
Concatenate capacitance-resistance（Rx1、Cx1）After circuit and resistance Rx2, then by series capacitance Cx2 V1 ends are followed by, form x phase current mutual inductors
Protective loop.
It is described it is single-phase return in, it is three terminal bidirectional crystalline substance lock to further include bidirectional thyristor a Qx1, the bidirectional thyristor Qx1
Pipe, both end of which are connected in parallel with wire connection terminal Jx1, and the other end connects through bilateral diode Dx1 and resistance Rx1 and capacitance Cx1
Connect.
The varistor circuit further includes the current transformer connecting terminal a being connected in parallel Jx2.
Wherein, x=1 or 2 or 3.
With piezoresistor type current transformer of the prior art（CT）Compare, the utility model current transformer protection dress
Putting has the advantages that the course of work is more stable.
Brief description of the drawings
Fig. 1：Protector of current mutual inductor circuit diagram in the prior art；
Fig. 2：The utility model protector of current mutual inductor single-phase circuit schematic diagram；
Fig. 3：The utility model protector of current mutual inductor three-phase circuit schematic diagram.
Embodiment
In order to which the technical problem, technical solution and the beneficial effect that are solved the utility model are more clearly understood, below
With reference to accompanying drawings and embodiments, the utility model is further elaborated.
As shown in Fig. 2, a kind of protector of current mutual inductor provided by the utility model, if during x=1, its single-phase circuit by
Wire connection terminal J11, wire connection terminal J12, varistor RV11, resistance R11, capacitance C11, capacitance C12 are formed.Wherein, the electricity
Hinder R11 and capacitance C11 and form capacitance-resistance circuit.The effect of bypass resistance R12 is the electric discharge for capacitance C11.The effect of capacitance C12
It is High frequency filter, for by the high-frequency interferencing signal of secondary circuit, the earth to be passed to by V1 common ports.
Under Current Transmit secondary circuit broken string state：When secondary voltage exceedes varistor RV11 rated voltages
（240V）When, varistor RV11 conductings, capacitance C11 is started to charge up, and the effect of resistance R11 is to slow down the charging rate of capacitance,
So that the voltage at capacitance C11 both ends gently rises.When capacitance C11 both end voltages rise to, bilateral diode, 11 rated voltage
During 35V, bilateral diode D11 conductings, and trigger bidirectional triode thyristor Q11 work.The major function of capacitance C11 is touched after energy storage
Send out bilateral diode D11 conductings.The effect of bilateral diode D11 is exactly, in order to turn on bidirectional triode thyristor Q11.Bidirectional triode thyristor
Q11 fast and effeciently, can protect secondary side apparatus and people by Current Transformer Secondary side voltage clamp within the specific limits
Body safety.At this time, electric current is flowed through from bidirectional triode thyristor element Q11, varistor RV11 both end voltages, can not meet to turn on bar
Part, because secondary circuit both end voltage is clamped down on by Q11, capacitance C11 is not recharged, and is discharged by discharge resistance R12, i.e.,：
Capacitance C11, resistance R11, resistance R12 form a discharge loop.
The utility model varistor circuit, including two current transformer connecting terminals being connected in parallel.Specifically, such as
Shown in Fig. 2, J11, J12 are 500 respectively:1 and 1000:The current transformer connecting terminal of 1 two kinds of no-load voltage ratios, according to different no-load voltage ratios,
The outlet of Current Transformer Secondary side is connected on J11 or J12.
As shown in figure 3, protector of current mutual inductor described in the utility model, in three-phase alternating current, there is three groups
Current transformer as shown in Figure 2, forms threephase current transformer protective loop.
Due to the operation principle of threephase current transformer protective loop, the work with single-phase current transformer protective loop is former
Manage identical, to avoid repeating, no longer the operation principle of threephase current transformer protective loop will be repeated herein.
The utility model current transformer connecting terminal J is the Molex wire connection terminals that specifications and models are 19-09-1039.It is double
It is the TECCOR thyristors that specifications and models are Q4010L5 to thyristor Q.Bilateral diode D is that specifications and models are HT-35's
TECCOR bidirectional trigger diodes.Varistor RV is the Panasonic varistors that specifications and models are ERZ-V14D241.
As shown in figure 3, in the utility model CT protection boards, in one-phase circuit therein：The model of capacitance C11, C12, C13
Specification be ECQ-E2103KS Panasonic charging capacitors, nominal parameter 250V, 0.01uF；Capacitance C12, C22, C32's
Specifications and models be ECQ-E6103KS Panasonic high-frequency filter capacitors, nominal parameter 630V, 0.01uF；Resistance R11,
R21, R31 are that nominal parameter is 1K Ω, the current-limiting resistance of 0.25W；Resistance R12, R22, R32 are that nominal parameter is 33.2K Ω,
The discharge resistance of 0.25W.Other quarter-phase circuits are correspondingly.
The utility model is connected capacitance-resistance circuit in traditional varistor circuit, and in parallel on whole protective loop
Three terminal bidirectional thyristor（Thyristor）So that protective loop being capable of stable discharging.The utility model and traditional pressure sensitive resistance
Formula CT protections are compared, and discharge process stability is improved.
Claims (4)
- It is mutual by least one electric current in the single-phase circuit 1. a kind of protector of current mutual inductor, including three single-phase circuits The circuit of sensor wire connection terminal Jx1 and a varistor RVx1 composition, it is characterised in that：The varistor RVx1 goes here and there respectively Connect capacitance-resistance（Rx1、Cx1）After circuit and resistance Rx2, then by series capacitance Cx2 V1 ends are followed by, form x phase current mutual inductors and protect Protect circuit.
- 2. protector of current mutual inductor as claimed in claim 1, it is characterised in that：It is described it is single-phase return in, further include one Bidirectional thyristor Qx1, the bidirectional thyristor Qx1 are three terminal bidirectional thyristor, and both end of which is in parallel with wire connection terminal Jx1 even Connect, the other end is connected through bilateral diode Dx1 with resistance Rx1 and capacitance Cx1.
- 3. protector of current mutual inductor as claimed in claim 1, it is characterised in that：The varistor circuit further includes one A current transformer connecting terminal Jx2 being connected in parallel.
- 4. protector of current mutual inductor as claimed in claim 1, it is characterised in that：Wherein, x=1 or 2 or 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721324966.6U CN207265643U (en) | 2017-10-13 | 2017-10-13 | A kind of protector of current mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721324966.6U CN207265643U (en) | 2017-10-13 | 2017-10-13 | A kind of protector of current mutual inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207265643U true CN207265643U (en) | 2018-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721324966.6U Active CN207265643U (en) | 2017-10-13 | 2017-10-13 | A kind of protector of current mutual inductor |
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| CN (1) | CN207265643U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113092868A (en) * | 2021-02-26 | 2021-07-09 | 广东电网有限责任公司广州供电局 | Resistance measuring method, device, system, equipment and storage medium |
-
2017
- 2017-10-13 CN CN201721324966.6U patent/CN207265643U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113092868A (en) * | 2021-02-26 | 2021-07-09 | 广东电网有限责任公司广州供电局 | Resistance measuring method, device, system, equipment and storage medium |
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