CN106526298A - Zero-sequence current measurement device and wiring method therefor - Google Patents
Zero-sequence current measurement device and wiring method therefor Download PDFInfo
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- CN106526298A CN106526298A CN201610851784.8A CN201610851784A CN106526298A CN 106526298 A CN106526298 A CN 106526298A CN 201610851784 A CN201610851784 A CN 201610851784A CN 106526298 A CN106526298 A CN 106526298A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
Abstract
The invention discloses a zero-sequence current measurement device and a wiring method therefor. The exterior of the body of the device is connected with five wiring terminals for flexible application and wiring, and the device can be compatible with an independent zero-sequence current connection method and a synthesis zero-sequence current connection method. Moreover, the independent zero-sequence current measurement and the synthesis zero-sequence current measurement are ingeniously combined to form a zero-sequence mutual inductor. The device is completely suitable for different external zero-sequence current connection methods under the condition that the internal circuit of the device is not changed, and is high in flexibility and adaptability.
Description
Technical field
The present invention relates to protecting electrical power system field, and in particular to a kind of zero sequence current measurement device and its mode of connection.
Background technology
When power distribution network occurs single-phase earthing, code regulation can be with failure operation with ground 2 hours；This is connect based on power distribution network
When earth-current is less, most of instantaneity ground arcs can be with self-extinguish, but if earth current is larger, single-phase earthing is electric
Arc sustained combustion, will occur arc grounding over-voltage, or the thermal ionization due to electric arc and photo-ionisation, can break ring surrounding air
Insulation, develop into phase fault accident, or even develop into " baked wheaten cake is operated " accident；So, when distribution net work earthing fault occurs
When, within a certain period of time the inspection of line that ground connection occurs out, and cut off within the regular hour；Then find event
Barrier point, and processed.
In power distribution network, zero-sequence current is the important means for reflecting earth fault；In the line, the phasor of three-phase current and
Equal to zero, i.e. Ia+Ib+Ic=0；If accessing a current transformer in the line, at this moment induced-current is zero；When in circuit
Generation is got an electric shock or during leak current fault, has leakage current to flow through in loop, at this moment through transformer three-phase current phasor and
Zero, its phasor and be：Ia+Ib+Ic=I (leakage current, i.e. zero-sequence current）；So just there is a sense in transformer secondary coil
Induced current, this electric current put on the electronic amplification circuit of detection part, compared with protection zone device predetermined action current value, if
More than action current, then sensitive relay action is made, act on executive component tripping operation；Here the transformer for being connect is referred to as zero sequence electricity
Current transformer, the phasor of three-phase current and is not equal to zero, and produced electric current is zero-sequence current.
The mode of existing measurement zero-sequence current has several, but each way can only all match a device, it is impossible to spirit
It is living to adapt to field demand；And the transformer parameter difference for adopting, which is to the parameter with institute's Current Transformer in secondary device
Also it is not quite similar；Its measurement zero-sequence current and phase current circuit are also not quite similar;If wanting to change cut-in method, need to change in device
Portion's current transformer and corresponding circuits parameter are very loaded down with trivial details；Then before order must need to know in advance if necessary to protection device
The production method of road user's zero-sequence current；Then the production method according to zero-sequence current, produces its corresponding device and supplies user
Use；Deliver behind scene, if zero-sequence current production method need to be changed；Corresponding protection device can not be used, it is necessary to again
Order.
The content of the invention
The invention aims to provide a kind of energy compatible independent zero sequence and synthesis zero sequence comprehensively, flexible adaptation scene
Demand, easily adjusts the zero sequence current measurement device and its mode of connection of zero sequence mode of connection at the scene.
The present invention is achieved through the following technical solutions：A kind of zero sequence current measurement device, including device body, with device sheet
The neutral terminal of body connection, A phase current binding posts, B phase current binding posts, C phase currents binding post and zero-sequence current connect
Line terminals；Described device is originally provided with self application circuit in vivo and is connected with five binding posts, and the self application circuit includes
One current transformer, the second current transformer, the 3rd current transformer, zero sequence current mutual inductor, the first amplifier, the second amplifier,
3rd amplifier, four high guaily unit, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, first resistor, second resistance, the 3rd
Resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance；The first of first current transformer is drawn
Pin is connected to A phase current binding posts, and the first pin of second current transformer is connected to B phase current binding posts, institute
The first pin for stating the 3rd current transformer is connected to C phase current binding posts, the second pin of the zero sequence current mutual inductor
It is connected to zero-sequence current binding post；The of first current transformer, the second current transformer and the 3rd current transformer
Two pins are connected to neutral terminal with the first pin of zero sequence current mutual inductor；3rd pin of first current transformer
There is the 5th resistance with the 4th pins in parallel, the 3rd pin and the 4th pins in parallel of second current transformer have the 6th electric
Resistance, the 3rd pin and the 4th pins in parallel of the 3rd current transformer have the 7th resistance, the zero sequence current mutual inductor
3rd pin and the 4th pins in parallel have the 8th resistance；3rd pin of first current transformer is connected to the first amplifier
Negative input, the 4th pin of first current transformer are connected to the positive input of the first amplifier and are grounded；Institute
The 3rd pin for stating the second current transformer is connected to the negative input of the second amplifier, and the 4th of second current transformer the
Pin is connected to the positive input of the second amplifier and is grounded；3rd pin of the 3rd current transformer is connected to the 3rd
The negative input of amplifier, the 4th pin of the 3rd current transformer are connected to the positive input of the 3rd amplifier and connect
Ground；3rd pin of the zero sequence current mutual inductor is connected to the negative input of four high guaily unit, the zero sequence current mutual inductor
The 4th pin be connected to the positive input of four high guaily unit and be grounded；The negative input of first amplifier and output end
Between be also parallel with first resistor and the first electric capacity, be also parallel between the negative input of second amplifier and output end
Two resistance and the second electric capacity, are also parallel with 3rd resistor and the 3rd electric between the negative input of the 3rd amplifier and output end
Hold, between the negative input of the four high guaily unit and output end, be also parallel with the 4th resistance and the 4th electric capacity；First fortune
Put, the output end of the second amplifier, the 3rd amplifier and four high guaily unit is connected to sampling module；First amplifier, the second amplifier,
Model LM324 of the 3rd amplifier and four high guaily unit；5th resistance, the 6th resistance, the 7th resistance, the 8th resistance are used for will
Current signal is converted to voltage signal by current sampling.
A kind of zero sequence current measurement device mode of connection, the self application connection in device body have neutral terminal, A phases
Current wiring terminal, B phase current binding posts, C phase currents binding post and zero-sequence current binding post；
When using synthesis zero-sequenceprotection：
Step a：Three-phase current A, B, C are respectively connected to into A phase current binding posts, B phase current binding posts, C phase current wiring
Terminal, and make neutral terminal hanging；
Step b：Three-phase current A, B, C are by A phase current binding posts, B phase current binding posts, C phase currents binding post point
Not Jin Ru the first current transformer, the second current transformer, the 3rd current transformer, then access self application circuit in inside
Electric current common port；
Step c：Internal current common port in self application circuit accesses zero-sequence current binding post through zero sequence current mutual inductor
Formed current loop, you can by zero sequence current mutual inductor detect three-phase current A, B, C current phasor and；
Step d：Three-phase current A, B, C are after the first current transformer, the second current transformer, the conversion of the 3rd current transformer
Again by current sampling, current signal is converted to into voltage signal, then carries out delivering to after signal amplifies filtering by amplifier and adopt
Egf block, three-phase current of the calculated electric current for A, B, C；And taken by electric current after zero sequence current mutual inductor is converted again
Current signal is converted to voltage signal by sample, then is carried out delivering to sampling module after signal amplifies filtering by amplifier, is now adopted
The electric current that egf block sampling is obtained is synthesis zero-sequence current；
When using independent zero-sequenceprotection：
Step a：Outside zero-sequence current is accessed into zero-sequence current binding post, A, C biphase current in three-phase current is connect respectively
Enter A phase currents binding post and C phase current binding posts.The B phase currents binding post is hanging；
Step b：A, C biphase current in three-phase current respectively through the first current transformer and the 3rd current transformer be connected to
On the center line of neutral terminal connection, i.e. foreign current common port, outside zero-sequence current are also coupled to after zero sequence current mutual inductor
On the center line being connected with neutral terminal；
Step c：A, C biphase current in three-phase current leads to after the first current transformer and the conversion of the 3rd current transformer again
Overcurrent is sampled, and current signal is converted to voltage signal, then carries out delivering to sampling mould after signal amplifies filtering by amplifier
Block, calculated electric current are A, C biphase current in three-phase current；And outside zero-sequence current is become by zero sequence current mutual inductor
Current signal is converted to by voltage signal by current sampling again after changing, then carries out sending after signal amplifies filtering by amplifier
To sampling module, the electric current that now sampling module sampling is obtained is independent zero-sequence current.
Preferably, sharing same ZCT using independent zero-sequenceprotection and using when synthesizing zero-sequenceprotection.
The present invention is used for flexible Application wiring by connecting 5 binding posts outside device body, can be with compatible independent zero
Sequence electric current connection and synthesis zero-sequence current connection, and independent zero sequence current measurement and the ingenious combination of synthesis zero sequence current measurement are shared
One ZCT, in the case where device internal wiring is not changed, adapts to outside different zero-sequence current access side completely
Method, with powerful flexibility and adaptability.
Compared with prior art, the invention has benefit that：1）It is in the case where device internal wiring is not changed, complete
It is complete to adapt to outside different zero-sequence current cut-in method, with powerful flexibility and adaptability；2）Device internal independence zero sequence
The compatible processing method of protection and synthesis zero-sequenceprotection；3）It is practical, it is easy to maintenance；4）Low cost, with stronger market
Competitiveness.
Description of the drawings
Fig. 1 is the structural representation of the present invention.
Fig. 2 is schematic diagram of the present invention using synthesis zero-sequenceprotection.
Fig. 3 is the schematic diagram that the present invention uses independent zero-sequenceprotection.
Specific embodiment
Below in conjunction with the accompanying drawings with specific embodiment, the invention will be further described.
See Fig. 1 to Fig. 3, a kind of zero sequence current measurement device, including device body, the neutral terminal being connected with device body
IN, A phase current binding post IA, B phase current binding post IB, C phase current binding post IC and zero-sequence current binding post I0；
Described device is originally provided with self application circuit in vivo and is connected with five binding posts, and the self application circuit includes that the first electric current is mutual
Sensor, the second current transformer, the 3rd current transformer, zero sequence current mutual inductor, the first amplifier L1, the second amplifier L2, the 3rd
Amplifier L3, four high guaily unit L4, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, first resistor R1, second
Resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8；It is described
First pin of the first current transformer is connected to A phase current binding post IA, the first pin of second current transformer
B phase current binding post IB are connected to, the first pin of the 3rd current transformer is connected to C phase current binding post IC,
The second pin of the zero sequence current mutual inductor is connected to zero-sequence current binding post I0；First current transformer, second
The second pin of current transformer and the 3rd current transformer is connected to middle line end with the first pin of zero sequence current mutual inductor
Sub- IN；3rd pin and the 4th pins in parallel of first current transformer has the 5th resistance R5, second Current Mutual Inductance
3rd pin of device and the 4th pins in parallel have the 6th resistance R6, the 3rd pin and the 4th pin of the 3rd current transformer
The 7th resistance R7 is parallel with, the 3rd pin of the zero sequence current mutual inductor and the 4th pins in parallel have the 8th resistance R8；It is described
3rd pin of the first current transformer is connected to the negative input of the first amplifier L1, and the 4th of first current transformer the
Pin is connected to the positive input of the first amplifier L1 and is grounded；3rd pin of second current transformer is connected to
The negative input of two amplifiers L2, the 4th pin of second current transformer are connected to the positive input of the second amplifier L2
And it is grounded；3rd pin of the 3rd current transformer is connected to the negative input of the 3rd amplifier L3, and the described 3rd is electric
4th pin of current transformer is connected to the positive input of the 3rd amplifier L3 and is grounded；The of the zero sequence current mutual inductor
Three pins are connected to the negative input of four high guaily unit L4, and the 4th pin of the zero sequence current mutual inductor is connected to four high guaily unit
The positive input of L4 and it is grounded；First resistor is parallel with also between the negative input of first amplifier L1 and output end
R1 and the first electric capacity C1, is also parallel with second resistance R2 and second between the negative input of second amplifier L2 and output end
Electric capacity C2, is also parallel with 3rd resistor R3 and the 3rd electric capacity C3 between the negative input of the 3rd amplifier L3 and output end,
4th resistance R4 and the 4th electric capacity C4 is parallel with also between the negative input of the four high guaily unit L4 and output end；Described first
The output end of amplifier L1, the second amplifier L2, the 3rd amplifier L3 and four high guaily unit L4 is connected to sampling module；First amplifier
Model LM324 of L1, the second amplifier L2, the 3rd amplifier L3 and four high guaily unit L4；The 5th resistance R5, the 6th resistance R6,
7th resistance R7, the 8th resistance R8 are for by current sampling, being converted to voltage signal by current signal.
In present embodiment, the self application connection in device body has neutral terminal IN, A phase current binding post
IA, B phase current binding post IB, C phase current binding post IC and zero-sequence current binding post I0.
In present embodiment, when using synthesis zero-sequenceprotection, step a：Three-phase current A, B, C are respectively connected to into A phases electric
Stream binding post IA, B phase current binding post IB, C phase current binding post IC, and cause neutral terminal IN hanging；
Step b：Three-phase current A, B, C are by A phase current binding posts, B phase current binding posts, C phase currents binding post point
Not Jin Ru the first current transformer, the second current transformer, the 3rd current transformer, then access self application circuit in inside
Electric current common port；
Step c：Internal current common port in self application circuit accesses zero-sequence current binding post through zero sequence current mutual inductor
Formed current loop, you can by zero sequence current mutual inductor detect three-phase current A, B, C current phasor and；
Step d：Three-phase current A, B, C are after the first current transformer, the second current transformer, the conversion of the 3rd current transformer
Again by current sampling, current signal is converted to into voltage signal, then carries out delivering to after signal amplifies filtering by amplifier and adopt
Egf block, three-phase current of the calculated electric current for A, B, C；And taken by electric current after zero sequence current mutual inductor is converted again
Current signal is converted to voltage signal by sample, then is carried out delivering to sampling module after signal amplifies filtering by amplifier, is now adopted
The electric current that egf block sampling is obtained is synthesis zero-sequence current.
In present embodiment, when using independent zero-sequenceprotection：Step a：Outside zero-sequence current access zero-sequence current is connect
A, C biphase current in three-phase current is respectively connected to A phase current binding post IA and C phase current binding posts by line terminals I0
Center line is accessed neutral terminal IN by IC, and the B phase currents binding post IB is hanging；
Step b：A, C biphase current in three-phase current respectively through the first current transformer and the 3rd current transformer be connected to
On the center line of neutral terminal IN connection, i.e. foreign current common port, outside zero-sequence current are also connect after zero sequence current mutual inductor
To on the center line being connected with neutral terminal IN；
Step c：A, C biphase current in three-phase current leads to after the first current transformer and the conversion of the 3rd current transformer again
Overcurrent is sampled, and current signal is converted to voltage signal, then carries out delivering to sampling mould after signal amplifies filtering by amplifier
Block, calculated electric current are A, C biphase current in three-phase current；And outside zero-sequence current is become by zero sequence current mutual inductor
Current signal is converted to by voltage signal by current sampling again after changing, then carries out sending after signal amplifies filtering by amplifier
To sampling module, the electric current that now sampling module sampling is obtained is independent zero-sequence current.
In present embodiment, same zero-sequence mutual inductance is shared using independent zero-sequenceprotection and using when synthesizing zero-sequenceprotection
Device；I.e. when using synthesis zero-sequenceprotection, synthesis zero-sequence current is by the zero sequence on the internal current common port in self application circuit
What current transformer was obtained, it and when using independent zero-sequenceprotection inner transformation process share a transformer.
In present embodiment, independent zero-sequence current refers to direct measurement zero-sequence current, and which is by accessing one in outside line
Individual zero sequence current mutual inductor is measured；Under normal circumstances, the phasor of three-phase current and be equal to zero, i.e. Ia+Ib+Ic=0, at this moment sense
Electric current is zero；When there is electric shock or leak current fault in circuit, there is leakage current to flow through in loop, at this moment through the three of transformer
Phase current phasor and not etc. zero, its phasor and be：The phasor of Ia+Ib+Ic=I leakage current three-phase currents and it is not equal to zero, is produced
Raw electric current is independent zero-sequence current.This zero sequence is also known as " alone becoming zero sequence ".
In present embodiment, synthesis zero sequence is to calculate zero-sequence current by measuring ABC three-phase currents；Which need not be outside
Zero sequence current mutual inductor is accessed in portion's circuit；It is by the three-phase current vector superposition accessed outside by calculating inside device
Form；The electric current for obtaining by this method referred to as synthesizes zero-sequence current, and this zero sequence is also known as " synthesis zero sequence ".
In present embodiment, outside A, B, C threephase current transformer range is generally 600/5,400/5,200/5；And zero
The range of sequence current transformer is generally 20/1；Both transformer parameters are different, it is impossible to mutually general；In the same manner, which is to secondary
In device, the parameter of institute's Current Transformer is also not quite similar；Its measurement zero-sequence current and phase current circuit are also not quite similar.
In present embodiment, using during independent zero-sequenceprotection, using 4 terminals, which is respectively：A phase current binding posts
IA, C phase current binding post IC, neutral terminal IN and zero-sequence current binding post I0；Wherein, A phase currents binding post IA and C
Phase current binding post IC is respectively connected to A, C biphase current, and zero-sequence current binding post I0 accesses outside zero-sequence current, middle line end
Sub- IN accesses foreign current common port, as center line；：A phase currents and C phase currents are through the first current transformer and the 3rd electric current
After transformer, it is connected on the foreign current common port of neutral terminal IN；Zero-sequence current binding post I0 then accesses outside zero sequence electricity
Stream, outside zero-sequence current are also connected on the foreign current common port of neutral terminal IN after running past zero sequence current mutual inductor；A
Phase current and C phase currents are after the conversion of the first current transformer and the 3rd current transformer through being mainly made up of amplifier
Logic circuit process is delivered to A/D and adopts module samples, and calculated electric current is A phase currents and C phase currents；And outside zero sequence electricity
Stream is then adopted through mainly delivering to A/D by the logic circuit process that four high guaily unit L4 is constituted after zero sequence current mutual inductor conversion again
Independent zero-sequence current is become using the electric current for obtaining with module.
In present embodiment, using during synthesis zero-sequenceprotection, it is electric that A phase currents, B phase currents are respectively connected to A phases with C phase currents
Stream binding post IA, B phase current binding post IB and C phase current binding post IC, zero-sequence current binding post I0 then access outer
Portion's electric current common port, as center line；A phase currents, B phase currents and C phase currents pass through the first current transformer, the second Current Mutual Inductance
The internal current common port of adaptable line has been accessed after device and the 3rd current transformer just, then internally on electric current common port
A zero sequence current mutual inductor is provided with, is detected using zero sequence current mutual inductor, the electricity of A phase currents, B phase currents and C phase currents
Flow vector and, as zero-sequence current；And internal current common port accesses zero-sequence current wiring after zero sequence current mutual inductor again
Terminal I0, and its connection be foreign current common port, be formed a current loop；A phase currents, B phase currents are electric with C phases
Logic of the stream after the first current transformer, the second current transformer and the 3rd current transformer through being mainly made up of amplifier
Deliver to A/D to adopt using module after processing of circuit, calculated electric current is A phase currents, B phase currents and C phase currents；And this
When after zero sequence current mutual inductor conversion after the logic circuit process mainly be made up of four high guaily unit L4 deliver to A/D and adopt again
The electric current for obtaining is adopted with module for synthesizing zero-sequence current.
In present embodiment, synthesis zero-sequence current is no longer to flow through current transformer conversion Jing logics by original three-phase electricity
A/D samplings are sent to be calculated by software Vector modulation after processing of circuit；But internal phase current mutual inductor is flowed through by three-phase electricity
Electric current common port is accessed afterwards, zero sequence current mutual inductor is accessed on electric current common port, then Jing after logic circuit process send A/D to adopt
Sample is obtained；That is it is all after current transformer is converted, send A/D samplings to obtain to synthesize zero-sequence current and three-phase phase current；
Field demand just can be flexibly adapted to, zero sequence mode of connection is very easily adjusted at the scene.
Protection scope of the present invention includes but is not limited to embodiment of above, and protection scope of the present invention is with claims
It is defined, any replacement being readily apparent that to those skilled in the art that this technology is made, deformation, improvement each fall within the present invention's
Protection domain.
Claims (5)
1. a kind of zero sequence current measurement device, it is characterised in that：Including device body, the neutral terminal being connected with device body
（IN）, A phase current binding posts（IA）, B phase current binding posts（IB）, C phase current binding posts（IC）Connect with zero-sequence current
Line terminals（I0）；Described device is originally provided with self application circuit in vivo and is connected with five binding posts, the self application circuit bag
Include the first current transformer, the second current transformer, the 3rd current transformer, zero sequence current mutual inductor, the first amplifier（L1）,
Two amplifiers（L2）, the 3rd amplifier（L3）, four high guaily unit（L4）, the first electric capacity（C1）, the second electric capacity（C2）, the 3rd electric capacity（C3）、
4th electric capacity（C4）, first resistor（R1）, second resistance（R2）, 3rd resistor（R3）, the 4th resistance（R4）, the 5th resistance
（R5）, the 6th resistance（R6）, the 7th resistance（R7）, the 8th resistance（R8）；The first pin connection of first current transformer
To A phase current binding posts（IA）, the first pin of second current transformer is connected to B phase current binding posts（IB）,
First pin of the 3rd current transformer is connected to C phase current binding posts（IC）, the of the zero sequence current mutual inductor
Two pins are connected to zero-sequence current binding post（I0）；First current transformer, the second current transformer and the 3rd electric current
The second pin of transformer is connected to neutral terminal with the first pin of zero sequence current mutual inductor（IN）；First electric current is mutual
3rd pin of sensor and the 4th pins in parallel have the 5th resistance（R5）, the 3rd pin and the 4th of second current transformer
Pins in parallel has the 6th resistance（R6）, the 3rd pin and the 4th pins in parallel of the 3rd current transformer have the 7th resistance
（R7）, the 3rd pin of the zero sequence current mutual inductor and the 4th pins in parallel have the 8th resistance（R8）；First electric current is mutual
3rd pin of sensor is connected to the first amplifier（L1）Negative input, first current transformer the 4th pin connection
To the first amplifier（L1）Positive input and be grounded；3rd pin of second current transformer is connected to the second amplifier
（L2）Negative input, the 4th pin of second current transformer is connected to the second amplifier（L2）Positive input simultaneously
And be grounded；3rd pin of the 3rd current transformer is connected to the 3rd amplifier（L3）Negative input, the described 3rd is electric
4th pin of current transformer is connected to the 3rd amplifier（L3）Positive input and be grounded；The zero sequence current mutual inductor
3rd pin is connected to four high guaily unit（L4）Negative input, the 4th pin of the zero sequence current mutual inductor is connected to the 4th
Amplifier（L4）Positive input and be grounded；First amplifier（L1）Negative input and output end between be also parallel with
First resistor（R1）With the first electric capacity（C1）, second amplifier（L2）Negative input and output end between be also parallel with
Two resistance（R2）With the second electric capacity（C2）, the 3rd amplifier（L3）Negative input and output end between be also parallel with the 3rd
Resistance（R3）With the 3rd electric capacity（C3）, the four high guaily unit（L4）Negative input and output end between to be also parallel with the 4th electric
Resistance（R4）With the 4th electric capacity（C4）；First amplifier（L1）, the second amplifier（L2）, the 3rd amplifier（L3）With four high guaily unit（L4）
Output end be connected to sampling module.
2. a kind of zero sequence current measurement device according to claim 1, it is characterised in that：First amplifier（L1）,
Two amplifiers（L2）, the 3rd amplifier（L3）With four high guaily unit（L4）Model LM324.
3. a kind of zero sequence current measurement device according to claim 1, it is characterised in that：5th resistance（R5）,
Six resistance（R6）, the 7th resistance（R7）, the 8th resistance（R8）For by current sampling, current signal being converted to voltage signal.
4. a kind of zero sequence current measurement device mode of connection, it is characterised in that：During self application connection in device body has
Line terminals（IN）, A phase current binding posts（IA）, B phase current binding posts（IB）, C phase current binding posts（IC）And zero sequence
Current wiring terminal（I0）；
When using synthesis zero-sequenceprotection, step a：Three-phase current A, B, C are respectively connected to into A phase current binding posts（IA）, B phases
Current wiring terminal（IB）, C phase current binding posts（IC）, and cause neutral terminal（IN）Vacantly；
Step b：Three-phase current A, B, C pass through A phase current binding posts（IA）, B phase current binding posts（IB）, C phase currents connect
Line terminals（IC）The first current transformer, the second current transformer, the 3rd current transformer is respectively enterd, and accesses self application
Internal current common port in circuit；
Step c：Internal current common port in self application circuit passes through zero-sequence current binding post through zero sequence current mutual inductor
（I0）It is connected with zero sequence current mutual inductor and forms current loop, you can three-phase current A, B, C is detected by zero sequence current mutual inductor
Current phasor and；
Step d：Three-phase current A, B, C are after the first current transformer, the second current transformer, the conversion of the 3rd current transformer
Again by current sampling, current signal is converted to into voltage signal, then carries out delivering to after signal amplifies filtering by amplifier and adopt
Egf block, three-phase current of the calculated electric current for A, B, C；And taken by electric current after zero sequence current mutual inductor is converted again
Current signal is converted to voltage signal by sample, then is carried out delivering to sampling module after signal amplifies filtering by amplifier, is now adopted
The electric current that egf block sampling is obtained is synthesis zero-sequence current；
When using independent zero-sequenceprotection：Step a：Outside zero-sequence current is accessed into zero-sequence current binding post（I0）, by three-phase
A, C biphase current in electric current is respectively connected to A phase current binding posts（IA）With C phase current binding posts（IC）, center line is connect
Enter neutral terminal（IN）, the B phase currents binding post（IB）Vacantly；
Step b：A, C biphase current in three-phase current respectively through the first current transformer and the 3rd current transformer be connected to
Neutral terminal（IN）On the center line of connection, i.e. foreign current common port, outside zero-sequence current is after zero sequence current mutual inductor
It is connected to and neutral terminal（IN）On the center line of connection；
Step c：A, C biphase current in three-phase current leads to after the first current transformer and the conversion of the 3rd current transformer again
Overcurrent is sampled, and current signal is converted to voltage signal, then carries out delivering to sampling mould after signal amplifies filtering by amplifier
Block, calculated electric current are A, C biphase current in three-phase current；And outside zero-sequence current is become by zero sequence current mutual inductor
Current signal is converted to by voltage signal by current sampling again after changing, then carries out sending after signal amplifies filtering by amplifier
To sampling module, the electric current that now sampling module sampling is obtained is independent zero-sequence current.
5. a kind of zero sequence current measurement device mode of connection according to claim 1, it is characterised in that：Using independent zero sequence
Protect and same ZCT is shared using when synthesizing zero-sequenceprotection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610851784.8A CN106526298B (en) | 2016-09-27 | 2016-09-27 | A kind of zero sequence current measurement device and its mode of connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110112712A (en) * | 2019-04-30 | 2019-08-09 | 广东电网有限责任公司 | Power distribution network earth protective device and its sampling control method with the configuration of double mutual inductors |
| CN116148521A (en) * | 2023-04-14 | 2023-05-23 | 烟台东方威思顿电气有限公司 | High-voltage metering device and depth fusion type polar column |
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| CN103364627A (en) * | 2013-07-15 | 2013-10-23 | 长城电器集团有限公司 | Leakage current detection circuit of automatic reclosing lock disconnector |
| CN203746656U (en) * | 2014-03-03 | 2014-07-30 | 天水长开互感器制造有限公司 | Three-phase anti-resonance voltage transformer |
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| CN2710223Y (en) * | 2004-04-09 | 2005-07-13 | 北京航空航天大学 | Microcomputer protection device of terminal user switch cubicle with power supple |
| CN1744405A (en) * | 2005-09-16 | 2006-03-08 | 广东珠江开关有限公司 | Intelligent self-learning motor protective circuit breaker |
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| CN110112712A (en) * | 2019-04-30 | 2019-08-09 | 广东电网有限责任公司 | Power distribution network earth protective device and its sampling control method with the configuration of double mutual inductors |
| CN116148521A (en) * | 2023-04-14 | 2023-05-23 | 烟台东方威思顿电气有限公司 | High-voltage metering device and depth fusion type polar column |
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| CN106526298B (en) | 2019-02-15 |
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Denomination of invention: A zero sequence current measuring device and its wiring method Effective date of registration: 20220214 Granted publication date: 20190215 Pledgee: Agricultural Bank of China Limited Ningbo Yinzhou Branch Pledgor: Ningbo Sanxing Smart Electric Co.,Ltd. Registration number: Y2022330000213 |
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Date of cancellation: 20221201 Granted publication date: 20190215 Pledgee: Agricultural Bank of China Limited Ningbo Yinzhou Branch Pledgor: Ningbo Sanxing Smart Electric Co.,Ltd. Registration number: Y2022330000213 |