CN103901252A - 10 KV electric transmission line zero-sequence current detection system - Google Patents
10 KV electric transmission line zero-sequence current detection system Download PDFInfo
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- CN103901252A CN103901252A CN201410136553.XA CN201410136553A CN103901252A CN 103901252 A CN103901252 A CN 103901252A CN 201410136553 A CN201410136553 A CN 201410136553A CN 103901252 A CN103901252 A CN 103901252A
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Abstract
The invention discloses a 10 KV electric transmission line zero-sequence current detection system. The 10 KV electric transmission line zero-sequence current detection system is characterized in that head ends of auxiliary coils of three load current transformers are connected with a load current detection loop respectively, the tail ends of the auxiliary coils of the three load current transformers are connected with the same point SO, and a zero detection transducer is arranged between the point SO and a signal common end com, wherein the point SO is the head end of a primary coil of the zero detection transducer, and the com end is the tail end of the primary coil of the zero detection transducer. A zero-sequence current sampling resistor Rx is connected to the head end of the auxiliary coil of the zero detection transducer, one end of the resistor Rx is connected to a comprehensive signal processing circuit, the other end of the resistor Rx is connected to the com end, and the tail end of the auxiliary coil of the zero detection transducer is connected to the com end. By means of the 10 KV electric transmission line zero-sequence current detection system, the 10 KV electric transmission line zero-frequency current detection mode in the prior art is changed, micromation and invisibility are achieved, detection accuracy is substantially improved, and false zero-sequence current detection is completely avoided.
Description
Technical field
The present invention relates to a kind of 10KV power transmission line zero-sequence current detecting system, belong to 10KV AC high-voltage electric transmission line technical field; According to the regulation classification of " high-technology field that state key is supported ", belong to electric and electronic technical field.
Background technology
In 10KV transmission line of alternation current, in order to find in time and to get rid of earth fault, need to detect at any time " zero-sequence current ".So-called " zero-sequence current ", the popular leakage current (be also ground current) of transmission line of electricity to the earth of saying.Under prior art condition, the zero-sequence current that detects 10KV transmission line of electricity is all to use one to be called the device of " 10KV zero sequence current mutual inductor ", the method for utilization " three lines are also worn "---by the parallel phase three-wire three 10KV transmission line of electricity through hole through 10KV zero sequence current mutual inductor, the zero-sequence current of phase three-wire three 10KV transmission line of electricity can be detected by detecting the electric current of this mutual inductor secondary coil.This method basic feasible solution, but there are some defects: the one, involve great expense---all have high requirements at aspects such as electromagnetism conductive performance, tolerating high voltage performance, tolerance rugged surroundings performances, therefore manufacturing cost high (between existing market price 1500-2500 unit); The 2nd, volume is large, institute takes up space large, cannot realize built-in installation---because three high voltage transmission lines are from parallel passing in the through hole of 10KV zero sequence current mutual inductor, therefore have to this mutual inductor to be made into the ring-like body of ellipse (transverse is between 450-800 millimeter) that volume is larger; The 3rd, easily there is mistake survey---because three transmission pressure spans through mutual inductor through hole are too large, secondary coil is difficult to equilibrium to the sense degree that is subject to of three transmission pressures, false " zero-sequence current " easily detected, in the time that the electric current passing through in transmission line of electricity increases, " zero-sequence current " of falseness also increases thereupon, and it is much that the mistake that this situation causes is surveyed the phenomenon of judging by accident.
Summary of the invention
Object of the present invention is intended to improve the weak point that prior art exists, and the 10KV power transmission line zero-sequence that a kind of accuracy is high, volume is little, with low cost current detecting system is provided.
Technical scheme provided by the invention is: a kind of 10KV power transmission line zero-sequence current detecting system, include load current mutual inductor, load current detection loop, Comprehensive Signal Processing circuit and signal common port com, feature is: load current mutual inductor is provided with three, in corresponding load current detection loop, be also provided with three detecting element ZA, ZB, ZC, the various parameter requests of three load current mutual inductors are consistent, article three, 10KV transmission line of electricity A, B, C passes the primary coil as three load current mutual inductors from the through hole of three load current mutual inductors respectively, the secondary coil of three load current mutual inductors is divided into head end and tail end according to coiling direction, its head end respectively with three detecting element ZA in load current detection loop, ZB, three input ends of ZC join, its tail end is connected to same point SO,
Between SO point and signal common port com, be provided with and survey zero mutual inductor, draw a wire from SO point and wear that around surveying the through hole of zero mutual inductor, to receive signal common port com upper as primary coil, SO end is for surveying the head end of zero mutual inductor primary coil, and signal common port com end is for surveying the tail end of zero mutual inductor primary coil; Be connected with zero-sequence current at the head end place that surveys zero mutual inductor secondary coil and detect loop, zero-sequence current detects in loop and is provided with zero-sequence current sampling resistor Rx, an input end Lx of one end access Comprehensive Signal Processing circuit of resistance R x, the other end of resistance R x is connected to signal common port com; The tail end of surveying zero mutual inductor secondary coil is connected to signal common port com;
Three detecting element ZA, the ZB in load current detection loop, the input and output common port GA of ZC, GB, GC are with being connected to signal common port com, and three detecting element ZA, ZB, ZC output terminals separately access respectively input end LA, LB, the LC of Comprehensive Signal Processing circuit.
In technical scheme of the present invention, to be provided with to survey zero mutual inductor with the remarkable difference of prior art, the primary coil of surveying zero mutual inductor is that single line is worn around mutual inductor through hole, and be three lines and wear unlike 10KV zero sequence current mutual inductor of the prior art, only for a circle, and the number of turn of described survey zero mutual inductor primary coil coiling is the amount doesn't matter, can between 1-100 circle, take the circumstances into consideration to choose (it is higher that the number of turn is picked up the sensitivity of zero-sequence current more), its secondary coil number of turn is also the amount doesn't matter, can between 500-2000 circle, take the circumstances into consideration to choose (it is higher that the number of turn is picked up the accuracy of zero-sequence current more).
Because survey zero mutual inductor of the present invention has adopted above-mentioned special construction, therefore this survey zero mutual inductor entirety can be made into the small body of circular ring type---and can make external diameter and only have tens millimeters, internal diameters to only have the small body of several millimeters.And 10KV zero sequence current mutual inductor of the prior art is subject to many condition restriction cannot realize miniaturization.
In technical solution of the present invention, zero-sequence current detects the span broadness of the zero-sequence current sampling resistor Rx in loop, and its resistance can take the circumstances into consideration to choose (the larger sensitivity of resistance is higher, and the less accuracy of resistance is higher) between 100-2000 ohm.
In technical solution of the present invention, three detecting element ZA, ZB in load current detection loop, ZC can be both current transformers, can be also resistors, and two kinds of frame modes do not affect the enforcement of technical solution of the present invention.
10KV power transmission line zero-sequence current detecting system technical scheme provided by the invention, change the pattern of prior art detection zero-sequence current, the not enough problem that can solve well existing 10KV power transmission line zero-sequence current transformer, compared with the prior art tool has the following advantages:
1, microminiaturization, built-in stealthy formula---can accomplish that owing to surveying zero mutual inductor its physical dimension only has tens millimeters, therefore can as an electronic component, weld in the circuit board, control box is not generally taken up space;
2, can not measure false " zero-sequence current " by mistake---adopt " single line wear around " mode because survey the primary coil of zero mutual inductor, so there is not the unbalanced problem of sense degree that is subject to;
3, cost is low---and be arranged in control box, not affected by high electric field and rugged surroundings, all less demanding to material selection and processing technology, therefore manufacturing cost can reduce greatly, can be rated as inexpensive.
Below in conjunction with drawings and Examples, the present invention is described in detail.
Accompanying drawing explanation
Fig. 1 is the basic structure schematic diagram of an embodiment of the present invention;
Fig. 2 is the basic structure schematic diagram of the another kind of embodiment of the present invention.
The explanation of accompanying drawing drawing:
1---load current mutual inductor, 2---load current detection loop, 3---survey zero mutual inductor, 3-1---survey the primary coil of zero mutual inductor, 3-2---survey the secondary coil of zero mutual inductor, 4---zero-sequence current detects loop, 5---Comprehensive Signal Processing circuit, com---signal common port;
A, B, C---through three 10KV transmission lines of electricity (xsect of the wire that is depicted as in figure) of load current mutual inductor, ZA, ZB, ZC---three detecting elements in load current detection loop, Rx---zero-sequence current sampling resistor, LA, LB, LC, Lx---the input end of Comprehensive Signal Processing circuit.
Embodiment
Contrasting Fig. 1 below elaborates to the principle of work of technical solution of the present invention.
Fig. 1 is the basic block diagram of an embodiment of the present invention, include three load current mutual inductors 1, load current detection loop 2, Comprehensive Signal Processing circuit 5 and signal common port com, the various parameters of three load current mutual inductors 1 are basically identical, three detecting element ZA in load current detection loop 2, ZB, what ZC used is shape small size current mutual inductor, article three, 10KV transmission line of electricity A, B, C passes the primary coil as three load current mutual inductors 1 from the through hole of three load current mutual inductors 1 respectively, the secondary coil of three load current mutual inductors 1 is divided into head end and tail end according to coiling direction, its head end respectively with three detecting element ZA in load current detection loop 2, ZB, three input ends of ZC join, its tail end is connected to same point SO,
Between SO point and signal common port com, be provided with and survey zero mutual inductor 3, draw a wire from SO point and wear that around surveying the through hole of zero mutual inductor 3, to receive signal common port com upper as primary coil 3-1, SO end is for surveying the head end of zero mutual inductor 3 primary coil 3-1, and signal common port com end is for surveying the tail end of zero mutual inductor 3 primary coil 3-1; Head end place at the secondary coil 3-2 that surveys zero mutual inductor 3 is connected with zero-sequence current detection loop 4, zero-sequence current detects in loop 4 and is provided with zero-sequence current sampling resistor Rx, an input end Lx of one end access Comprehensive Signal Processing circuit 5 of resistance R x, the other end of resistance R x is connected to signal common port com; The tail end of surveying the secondary coil 3-2 of zero mutual inductor 3 is connected to signal common port com;
In load current detection loop 2, with three shape small size current mutual inductors as three detecting element ZA, ZB, ZC, the head end of its primary coil is exactly input end, the head end of its secondary coil is exactly output terminal, it is exactly described three detecting element ZA, ZB, the input and output common port GA of ZC, GB, GC that the tail end of primary coil and secondary coil is connected together, GA, GB, GC are with being connected to signal common port com, and three detecting element ZA, ZB, ZC output terminals separately access respectively input end LA, LB, the LC of Comprehensive Signal Processing circuit 5.
As everyone knows, article three, 10KV transmission line of electricity A, B, C front end are from transformer station, after terminate on the primary coil of transmission of electricity custom power transformer, three load current mutual inductors 1 are connected between transformer station and power transformer, on three 10KV transmission lines of electricity of adjacent power transformer, wherein be called the input end of load current mutual inductor 1 towards one end of transformer station, be called the output terminal of load current mutual inductor 1 towards one end of power transformer.Because the primary coil of power transformer is all " Δ " shape connection conventionally, in the situation that there is not earth fault in three 10KV transmission line of electricity load current mutual inductor output terminals, the vector of threephase load electric current always equals zero, therefore the vector that flows through three load current mutual inductor primary coil electric currents also equals zero, and now system is in normal operating condition.
Because be all three load current mutual inductors and all basically identical (lay special stress on of the present invention) of the various parameters in detection loop separately thereof conventionally, the secondary coil of three load current mutual inductors is that (three tail ends are connected on same point SO to " Y " shape connection, three head ends are respectively to outer lead), therefore in the situation that there is not earth fault in three 10KV transmission line of electricity load current mutual inductor output terminals, the vector of threephase load electric current always equals zero, sense that thus the vector of three electric currents in load current mutual inductor secondary coil is also along with equalling zero, three shape small size current mutual inductor ZA, ZB, the vector of ZC primary coil electric current is also along with equalling zero, ZA, ZB, the vector of ZC secondary coil electric current also certainly will equal zero, so just making does not have electric potential difference between SO-com---there is no voltage, just do not have electric current yet.But, in the time of the output terminal generation earth fault of 10KV transmission line of electricity load mutual inductor, the vector of three-phase 10KV transmission line of electricity electric current no longer equals zero---occur that a numerical value and phase place equal the electric current of ground current, cause thus three current phasors in load current mutual inductor secondary coil and be also not equal to zero, between SO-com, there is electric potential difference, thereby just there is electric current to flow through the primary coil 3-1 that surveys zero mutual inductor 3, in secondary coil 3-2, be also just induced electric current thereupon, this electric current flows through zero-sequence current sampling resistor Rx, must there is voltage at resistance R x two ends---sampled voltage, this voltage is according to being transported in Comprehensive Signal Processing circuit 5 with the proportional numerical value of actual ground current, after processing, Comprehensive Signal Processing circuit 5 is reduced into actual power transmission line zero-sequence current values.Here it should be noted that: due to survey the primary coil 3-1 of zero mutual inductor 3 be single line wear around, therefore just never there is the problem of " induction degree is unbalanced ", thereby can avoid occurring the problem of false " zero-sequence current " completely; Due to survey the primary coil 3-1 of zero mutual inductor 3 be single line wear around, therefore can improve flexibly its sensitivity by the method that increases the number of turn; Due to survey the primary coil 3-1 of zero mutual inductor 3 be single line wear around, the current values that in coil, actual flow is crossed is very little, so do not need the wire that current-carrying capacity is large, the physical dimension of therefore surveying zero mutual inductor 3 can be very little, institute takes up space very little, and manufacturing cost also can significantly reduce.In addition, very little because actual flow is crossed the current values of zero sequence current sampling resistor Rx, so resistance R x selects miniwatt precision resistance.
Figure 2 shows that another embodiment of the present invention---what detecting element in load current detection loop 2 was used is resistor.In Fig. 2, with three resistors as detecting element ZA, ZB, ZC in described load current detection loop 2, every resistor string is associated in load current detection loop with " point platen press " and implements input, the secondary coil head end of one end of every resistor and respective load current transformer 1 joins, this end joins with the input end (LA, LB, LC) of Comprehensive Signal Processing circuit 5 simultaneously, and the other end (GA, GB, GC) of every resistor is with joining with signal common port com.Shown in Fig. 2, in circuit, can obtain identical effect with the shape small size current mutual inductor that resistor replaces in Fig. 1 circuit, and circuit is simpler.
Claims (6)
1. a 10KV power transmission line zero-sequence current detecting system, include load current mutual inductor (1), load current detection loop (2), Comprehensive Signal Processing circuit (5) and signal common port com, it is characterized in that: load current mutual inductor (1) is provided with three, in corresponding load current detection loop (2), be also provided with three detecting element ZA, ZB, ZC, article three, 10KV transmission line of electricity A, B, C passes the primary coil as three load current mutual inductors (1) from the through hole of three load current mutual inductors (1) respectively, the secondary coil of three load current mutual inductors (1) is divided into head end and tail end according to coiling direction, its head end respectively with three detecting element ZA of load current detection loop (2), ZB, three input ends of ZC join, its tail end is connected to same point SO,
Between SO point and signal common port com, be provided with and survey zero mutual inductor (3), draw a wire from SO point and wear that around the through hole of surveying zero mutual inductor (3), to receive signal common port com upper as primary coil (3-1), SO end is for surveying the head end of zero mutual inductor (3) primary coil (3-1), and signal common port com end is for surveying the tail end of zero mutual inductor (3) primary coil (3-1); Head end place at the secondary coil (3-2) of surveying zero mutual inductor (3) is connected with zero-sequence current detection loop (4), zero-sequence current detects in loop (4) and is provided with zero-sequence current sampling resistor Rx, an input end Lx of one end access Comprehensive Signal Processing circuit (5) of resistance R x, the other end of resistance R x is connected to signal common port com; The tail end of surveying the secondary coil (3-2) of zero mutual inductor (3) is connected to signal common port com;
Three detecting element ZA, the ZB in load current detection loop (2), the input and output common port GA of ZC, GB, GC are with being connected to signal common port com, and three detecting element ZA, ZB, ZC output terminals separately access respectively input end LA, LB, the LC of Comprehensive Signal Processing circuit (5).
2. according to 10KV power transmission line zero-sequence current detecting system claimed in claim 1, it is characterized in that: the primary coil (3-1) of surveying zero mutual inductor (3) is that single line is worn around forming, and the number of turn of coiling is 1-100 circle.
3. according to 10KV power transmission line zero-sequence current detecting system claimed in claim 1, it is characterized in that: surveying zero mutual inductor (3) entirety is the small body of circular ring type.
4. according to 10KV power transmission line zero-sequence current detecting system claimed in claim 1, it is characterized in that: the resistance that zero-sequence current detects zero-sequence current sampling resistor Rx in loop (4) is 100-2000 ohm.
5. according to 10KV power transmission line zero-sequence current detecting system claimed in claim 1, it is characterized in that: detecting element ZA, ZB, ZC in load current detection loop (3) are current transformers.
6. according to 10KV power transmission line zero-sequence current detecting system claimed in claim 1, it is characterized in that: detecting element ZA, ZB, ZC in load current detection loop (3) are resistors.
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| CN201410136553.XA CN103901252B (en) | 2014-04-08 | 2014-04-08 | 10KV power transmission line zero-sequence current detecting systems |
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| CN201410136553.XA CN103901252B (en) | 2014-04-08 | 2014-04-08 | 10KV power transmission line zero-sequence current detecting systems |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106771483A (en) * | 2016-12-15 | 2017-05-31 | 东南大学 | A kind of zero-sequence current remote real time monitoring system and monitoring method |
| CN107796979A (en) * | 2017-10-02 | 2018-03-13 | 国网山西省电力公司电力科学研究院 | The overhead distribution zero-sequence current waveform acquisition equipment of anti-nearby lines interference |
| CN110058071A (en) * | 2019-04-30 | 2019-07-26 | 上海固缘电力科技有限公司 | Zero sequence current sensor circuit topology and switch pole |
| CN116500328A (en) * | 2023-06-06 | 2023-07-28 | 无锡市锡山湖光电器有限公司 | High-precision three-phase current sensor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110058071A (en) * | 2019-04-30 | 2019-07-26 | 上海固缘电力科技有限公司 | Zero sequence current sensor circuit topology and switch pole |
| CN116500328A (en) * | 2023-06-06 | 2023-07-28 | 无锡市锡山湖光电器有限公司 | High-precision three-phase current sensor |
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