CN1518182A - Insulation diagnostic device - Google Patents
Insulation diagnostic device Download PDFInfo
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- CN1518182A CN1518182A CNA2004100006057A CN200410000605A CN1518182A CN 1518182 A CN1518182 A CN 1518182A CN A2004100006057 A CNA2004100006057 A CN A2004100006057A CN 200410000605 A CN200410000605 A CN 200410000605A CN 1518182 A CN1518182 A CN 1518182A
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Abstract
本发明涉及绝缘诊断装置，特别是涉及适用于判断电力系统中的电缆等电气设备的绝缘劣化倾向的绝缘诊断装置。本发明提供的绝缘诊断装置，能够在不使实际使用状态中的电力设备停止的情况下安全且经常地诊断绝缘劣化，可以在间歇弧光接地发生时，特定接地发生的有无和事故线路，还可以远距离地进行判断。该绝缘诊断装置具有：输入电力系统的零相电压、线间电压和由馈电线检测到的零相电流的PEAK－HOLD处理部；PEAK－HOLD复位处理部；相位区域检测处理部；具有定时器处理的计算间歇弧光接地的运算处理部；和与间歇过接地电压继电器(64K)联合的事故线路判定处理部。
The present invention relates to an insulation diagnosis device, in particular to an insulation diagnosis device suitable for judging the insulation deterioration tendency of electrical equipment such as cables in a power system. The insulation diagnosis device provided by the present invention can safely and frequently diagnose insulation deterioration without stopping the power equipment in the actual use state, and can specify the presence or absence of grounding and the fault line when intermittent arc grounding occurs, and also Judgments can be made at a distance. The insulation diagnosis device has: a PEAK-HOLD processing part for inputting the zero-phase voltage of the power system, the line-to-line voltage and the zero-phase current detected by the feeder; the PEAK-HOLD reset processing part; the phase area detection processing part; with a timer Calculation of the processing The calculation processing part of the intermittent arc grounding; and the accident line judgment processing part combined with the intermittent over-grounding voltage relay (64K).
Description
Technical field
The present invention relates to isolation diagnostic device, particularly relate to the isolation diagnostic device that is applicable to the insulation degradation tendency of judging the electric equipments such as cable in the electric power system.
Background technology
Along with the progress of time, the insulation degradation of electric equipment finally causes the situation of ground fault and short circuit accident a lot.The development mechanism of insulation degradation is complicated, but in general, the pattern of following two kinds of situations is arranged probably.
At first, first kind of situation be, partly begins leakage current from the breakage and the deterioration of cable skin and conductor support insulator, and the heat that produces owing to this leakage current, pressure, ion etc. make breakage and deterioration progress, thereby leakage current is increased.
Another kind of situation is a situation about finding in cable etc., and moisture soaks into to insulant tree-shapedly, and insulation damages takes place quickly, recovers again then to insulate.
The latter is known as intermittently arc grounding, owing to this phenomenon finishes at short notice, and does not have reproducibility, so be difficult to detect.
But, recently there be following the requirement in electric equipment: under the state of live wire, detect intermittently requirement of the technology of arc light earth current and the requirement of formulating the predictive diagnosis technology of predetermined arrestment plan.
In the prior art, between the neutral point of earthed voltage transformer (being called for short GPT later on) and the earth, switching device is set, closed circuit when turning round usually, open circuit and apply direct voltage when insulation degradation is diagnosed at the two poles of the earth of switching device, instrumentation is from the leakage current of electric equipment to the earth, surpass under the situation of predetermined reference value in its result, electric equipment is stopped, checking the insulation degradation of power line one by one.But, after using this device instrumentation, be judged as in the unusual cable, what have when reality is used also can use no problemly, perhaps, is being judged as just often, and but presenting on reality is used of having is unusual.This is caused by following reason: mensuration is to implement with direct current, uses the condition of using with alternating voltage different and apply the delicate different of voltage with reality.
In addition, in patent documentation 1-Japanese kokai publication hei 4-42726 communique, take out voltage between lines signal and the voltage between lines signal of other two-phases part and the ground signalling that obtains by the Zero-phase current detection of benchmark respectively, judge the ground connection phase by its phase place, in addition, according to Zero-phase current judgement accident circuit, but the ground connection can not carry out arc grounding intermittently the time is detected and the judgement of accident circuit.
In addition, in patent documentation 2-Japanese kokai publication hei 6-300807 communique, because input zero phase voltage, Zero-phase current and voltage between lines, therefore, even arc grounding intermittently, though can carry out the specific of the judgement of deterioration phase and accident circuit, also exist to detect the weak current that causes by noise etc., be judged as the intermittently situation of arc grounding and accident circuit mistakenly.
Like this, in above-mentioned prior art, the electric equipment that must stop in the actual user mode is checked insulation degradation, and the check result reliability is not high, and in addition, the ground connection when being difficult to carry out arc grounding is intermittently detected and the judgement of accident circuit.
Summary of the invention
The objective of the invention is, a kind of isolation diagnostic device is provided, can be at the electric equipment in not stopping actual user mode and the diagnosing insulation deterioration, certainly, when taking place, arc grounding also can specificly have or not ground connection to take place and the accident circuit at intermittence.
The present invention is a kind of isolation diagnostic device, be used to detect the voltage between lines of electric power system and the insulation that zero phase voltage, Zero-phase current are diagnosed the electrician crop, it is characterized in that, have and calculate the intermittently arithmetic processing section of arc grounding, can come the particular incident circuit with the result according to the long-pending of peak value of Zero-phase current and zero phase voltage, can also be by carrying out the judgement of accident circuit from the remote place of efferent.
Description of drawings
Fig. 1 is the block diagram of an embodiment of expression isolation diagnostic device of the present invention.
Fig. 2 is the figure of configuration example of the electric equipment of the isolation diagnostic device of expression with one embodiment of the present of invention.
Fig. 3 is the block diagram of calculation process of an embodiment of expression isolation diagnostic device of the present invention.
Fig. 4 is the pie graph of expression one embodiment of the present of invention.
Fig. 5 is the content graph that the arc grounding at intermittence of expression one embodiment of the present of invention detects processing and the processing of accident wireline inspection.
Fig. 6 is an action phase place of the present invention zone key diagram.
Fig. 7 is an arc grounding detection calculations key diagram at intermittence of the present invention.
Fig. 8 is an accident circuit certain operations key diagram of the present invention.
Fig. 9 is timer calculation specification figure of the present invention.
Embodiment
Embodiments of the present invention below are described.
The hardware that Fig. 1 illustrates isolation diagnostic device constitutes.From external input signal, carry out calculation process by input part 1, input signal and operation result are stored in the memory 4 by CPU3.In addition, its formation can be carried out the demonstration of operation result and alarm by display part 5, exports operation result and alarm signal by efferent 6 to the outside.
Fig. 2 illustrates has isolation diagnostic device and the telemonitoring configuration example with the electric equipment of field monitor device.
At first, in Fig. 2, high tension distribution system equipment as the electric equipment right and wrong ground connection of object system, by the circuit breaker 8 that is connected with transformer 7, the bus 15 that is connected with circuit breaker 8, with a plurality of feed lines of drawing from bus 15 with circuit breaker 9～12, grounding transformer 13, be configured in each zero phase current transformer of going up mutually 50～53 and constitute.For the insulation degradation that carries out in these high tension distribution system equipment detects, take out Zero-phase current I from zero phase current transformer 50～53
0, take out voltage between lines and zero phase voltage V from grounding transformer 13
0, be input to isolation diagnostic device 14.In addition, to upper field monitor device 16 output testing results, the supervision in the field monitor device 16 self certainly utilizes the Internet and local area network (LAN) 17, remotely sends information to remote monitroing center 19 and Web terminal 18 etc.
The isolation diagnostic device 14 of one embodiment of the present of invention is taken into zero phase voltage V from grounding transformer 13
0With voltage between lines V1-2, V2-3, V3-1, from some Zero-phase current I that is taken into of zero phase current transformer 51～54
0, respectively as signal.Its contents processing as shown in Figure 3, by the zero phase voltage V of PEAK-HOLD20 conversion grounding transformer 13
0High frequency voltage, by effective value-adjusted value handling part 21 carry out the effective value computing and with the comparison operation of adjusted value, when adjusted value is above, by 36～38 couples of voltage between lines V1-2 of phase-shifts handling part, V2-3, V3-1 carries out the phase-shifts conversion, at this, (R mutually by the phase voltage after long-pending summation handling part 26～28 computings and the phase-shifts conversion, the S phase, the T phase voltage) long-pending summation, then, by maximum handling part 29 computing maximums, 30～32 couples of results carry out the AND computing by the AND handling part, as 64K (intermittent earth overvoltage relay) action operation result, by display part 33～35 phase-splitting display result.The PEAK-HOLD operational part, make phase-shifts 30 degree by phase-shifts handling part 36～38, after voltage between lines V1-2, V2-3, V3-1 be transformed into phase voltage, detect the trailing edge that handling part 22～24 detects phase voltage by trailing edge, carry out signal after OR handles according to 25 couples of results of OR handling part, carry out resetting of PEAK-HOLD.Why will be after being transformed into phase voltage, by the trailing edge PEAK-HOLD that resets, be because operation result (the long-pending and computing of phase voltage and PEAK-HOLD value) constitutes maximum sensitivity, when the trailing edge by phase voltage resets, no matter before or after the trailing edge of phase voltage, operation result all reduces.
On the other hand, to carry out result after effective value computing and the adjusted value comparison operation by effective value adjusted value handling part 21, detect handling part 39～41 by the phase place zone, with R mutually, S phase, T phase phase voltage comparison operation phase place zone, make the signal after the OR computing consistent by OR handling part 42 with the operation result in the zone shown in Fig. 6, in timer processing portion 43, rolling average maximum in 5 cycle portions of peak value retention value of zero phase voltage surpasses under the situation of adjusted value, makes the 64K action by 64K action handling part 44.
The computing example of timer shown in Fig. 7.When as figure zero phase waveform taking place, zero phase peak value is maximum 30V, but the rolling average maximum of 5 cycle portions of zero phase waveform is 24V, and the moving average maximum of the zero phase-shift in per 1 second is 24V.By with the rolling average maximum of 5 cycle portions as judging material, can prevent that the erroneous judgement that noise causes is disconnected.In addition, notice according to existing experimental result, intermittently the occurrence frequency of arc light grounding phenomenon many 0.1 second in 0.5 second, the situation more than 5 seconds does not take place, so be the adjusted value of timer with 1 second.Therefore, every through 1 second, zero phase peak value, the moving average maximum of zero phase-shift, the moving average maximum of the zero phase-shift in per 1 second are once resetted.
If implement above various computings, the zero phase voltage of the high frequency that takes place in the time of just can detecting arc grounding intermittently exactly, thus 64K is moved.
In addition, radio-frequency component with some Zero-phase currents of the zero phase current transformer 50～53 shown in PEAK-HOLD45 conversion Fig. 2, with long-pending and handling part 46, to by the zero phase voltage after the PEAK-HOLD20 computing and its result amasss and computing, in the result is under the situation of "+", just carry out the AND computing,, just be shown as the accident circuit with accident circuit display part 48 if the 64K of 64K action handling part 44 moves by AND handling part 47.If the result of long-pending and handling part 46 are "+" just can the particular incident circuit reason be, because during ground connection, electric current is towards the circuit diffluence that accident point is arranged, therefore, having the circuit Zero-phase current and zero phase voltage of accident point to become same-phase, is antiphase but do not have the circuit Zero-phase current of accident point and zero phase voltage, therefore, utilization get the long-pending of zero phase voltage and Zero-phase current and, can judge whether to comprise accident point.Therefore, if implement above such computing, just can judge whether it is the accident circuit exactly during arc grounding at intermittence.
In addition, by the efferent shown in Fig. 16, the instrumentation value, accident circuit, result of determination, the warning information that are stored in the memory 4 are outputed to the external device (ED)s such as field monitor device 16 that telemonitoring is used, even in remote place, also can be with reference to instrumentation value, accident circuit, result of determination, warning information.
Fig. 4 illustrates has isolation diagnostic device and the telemonitoring configuration example with the electric equipment of field monitor device.Be that with the difference of Fig. 2 electric equipment is different with connecting and composing of insulation monitor, in Fig. 2, on each feed line, all have an isolation diagnostic device, and in Fig. 4 is all, have only an isolation diagnostic device.
The isolation diagnostic device 14 ' of one embodiment of the present of invention, in the high tension distribution system equipment of the system of the non-ground connection shown in Fig. 4, be taken into zero phase voltage and voltage between lines and be taken into each self-monitoring Zero-phase current I from a plurality of zero phase current transformers 50～53 from grounding transformer 13
01～I
04, as signal.
Fig. 5 illustrates the functional block diagram of isolation diagnostic device 14 '.Be with the difference of Fig. 3, being input as of Zero-phase current is a plurality of, therefore, have PEAK-HOLD85～88, long-pending and handling part 89～92, AND handling part 93～96, accident circuit display part 97～100 in the importation of Zero-phase current, its formation can be carried out the judgement of a plurality of accident circuits simultaneously thereupon.
The contents processing of the isolation diagnostic device 14 ' of one embodiment of the present of invention as shown in Figure 5, by the zero phase voltage V of PEAK-HOLD60 conversion grounding transformer 13
0High frequency voltage, by effective value adjusted value handling part 61 carry out the effective value computing and with the comparison operation of adjusted value, when adjusted value is above, by phase-shifts handling part 76～78 phase-shifts conversion voltage between lines V1-2, V2-3, V3-1, at this, long-pending summation by the phase voltage of long-pending total handling part 66～68 computings and phase-shifts conversion (R mutually, S phase, T phase voltage), then, by maximum handling part 69 computing maximums, 70～72 couples of results carry out the AND computing by the AND handling part, as 64K action operation result, by display part 33～35 phase-splitting display result.The PEAK-HOLD operational part, make phase-shifts 30 degree by phase-shifts handling part 76～78, after voltage between lines V1-2, V2-3, V3-1 be transformed into phase voltage, detect the trailing edge that handling part 62～64 detects phase voltage by trailing edge, according to the result being carried out signal after the OR computing, carry out resetting of PEAK-HOLD by OR handling part 65.By trailing edge reset the reason of PEAK-HOLD with in isolation diagnostic device 14 explanation reason identical.
On the other hand, to carry out result after effective value computing and the adjusted value comparison operation by effective value adjusted value handling part 61, detect handling part 79～81 by the phase place zone, with R mutually, S phase, T phase phase voltage comparison operation phase place zone, make the signal that is undertaken after the OR computing by OR processor 82 consistent with the operation result in the zone shown in Fig. 6, in timer processing portion 83, rolling average maximum in 5 cycle portions of peak value retention value of zero phase voltage surpasses under the situation of adjusted value, makes the 64K action by 64K action handling part 84.About with the rolling average maximum of 5 cycle portions of peak value retention value of zero phase voltage as reason and the adjusted value of judging material, identical with isolation diagnostic device 14.
In addition, radio-frequency component with the Zero-phase current separately of PEAK-HOLD85～88 conversion zero phase current transformers 51～54, with long-pending and handling part 89～92, will by the zero phase voltage after the PEAK-HOLD60 computing and its result amasss and computing, in the result is under the situation of "+", carry out the AND computing by AND handling part 93～96, if the 64K of 64K action handling part 84 moves, just with accident circuit display part 97～100 demonstration accident circuits.If the result of long-pending and handling part 89～92 is "+" just can be specific for the reason of accident circuit be, electric current is towards the circuit diffluence that accident point is arranged during ground connection, therefore, there are the circuit Zero-phase current and zero phase voltage of accident point to become same-phase, but not having the circuit Zero-phase current of accident point and zero phase voltage is antiphase, therefore, utilize get the long-pending of zero phase voltage and Zero-phase current and, can judge the circuit that comprises accident point.
In addition, same with isolation diagnostic device 14, with instrumentation value, accident circuit, result of determination, the warning information that is stored in the memory 4, output to field monitor device 16 external device (ED)s such as grade that telemonitoring is used, even in remote place, also can be with reference to instrumentation value, accident circuit, result of determination, warning information.
As mentioned above,, do not make the electric equipment under the actual user mode stop just can carrying out the diagnosis of insulation degradation according to the present invention, and can be when intermittence, arc grounding took place, what specific ground connection was taken place has or not and the accident circuit, prevents that major accident is in possible trouble.
Claims (6)
1. isolation diagnostic device is characterized in that having: the PEAK-HOLD handling part, and its input is from zero phase voltage of grounding transformer and voltage between lines and from the Zero-phase current of the zero phase current transformer of feed line, the row operation of going forward side by side processing; PEAK-HOLD reset processing portion resets based on the operation result of this PEAK-HOLD handling part; Handling part is detected in the phase place zone, according to result and the phase voltage after effective value computing and the adjusted value comparison operation, and comparison operation phase place zone; Arithmetic processing section has timer processing, calculates the arc grounding at intermittence that the temporary transient insulation damages of insulant is recovered insulation afterwards again; With accident circuit determination processing portion, according to the result of the radio-frequency component of certain Zero-phase current of 1 of a plurality of zero phase current transformers of the above-mentioned feed line of PEAK-HOLD conversion with by the result long-pending and computing of the zero phase voltage of above-mentioned PEAK-HOLD handling part computing be positive and negative and the action of comparison intermittent earth overvoltage relay, the particular incident circuit.
2. isolation diagnostic device according to claim 1 is characterized in that above-mentioned feed line is made of a plurality of with circuit breaker, is input to above-mentioned PEAK-HOLD handling part from these a plurality of feed lines with the detected Zero-phase current of circuit breaker respectively, and the row operation of going forward side by side is handled.
3. isolation diagnostic device according to claim 1 and 2 is characterized in that, has outside output function.
4. isolation diagnostic device according to claim 3 is characterized in that, the said external output function is that instrumentation value, accident circuit, result of determination, warning information are outputed to Long-Range Surveillance Unit.
5. isolation diagnostic device according to claim 1 is characterized in that, the rolling average maximum of 5 cycle portions of peak value retention value of above-mentioned arithmetic processing section computing zero phase voltage is as the above-mentioned judgement material that intermittence, arc grounding took place.
6. isolation diagnostic device according to claim 1 or 5 is characterized in that, above-mentioned arithmetic processing section is set at 0.1～1.0 second with the time limit of its action timer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003008968 | 2003-01-17 | ||
| JP2003008968 | 2003-01-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1518182A true CN1518182A (en) | 2004-08-04 |
| CN100533903C CN100533903C (en) | 2009-08-26 |
Family
ID=34308277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100006057A Expired - Fee Related CN100533903C (en) | 2003-01-17 | 2004-01-13 | Insulation diagnostic device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN100533903C (en) |
| TW (1) | TWI231079B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102809717A (en) * | 2011-06-01 | 2012-12-05 | 三菱电机株式会社 | Insulation aging monitoring system |
| CN104034994A (en) * | 2014-05-06 | 2014-09-10 | 刘业军 | Novel photovoltaic-used direct current insulation monitoring module |
-
2003
- 2003-12-16 TW TW92135626A patent/TWI231079B/en not_active IP Right Cessation
-
2004
- 2004-01-13 CN CNB2004100006057A patent/CN100533903C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102809717A (en) * | 2011-06-01 | 2012-12-05 | 三菱电机株式会社 | Insulation aging monitoring system |
| CN102809717B (en) * | 2011-06-01 | 2016-05-11 | 三菱电机株式会社 | Insulation ag(e)ing surveillance |
| CN104034994A (en) * | 2014-05-06 | 2014-09-10 | 刘业军 | Novel photovoltaic-used direct current insulation monitoring module |
Also Published As
| Publication number | Publication date |
|---|---|
| TW200414645A (en) | 2004-08-01 |
| TWI231079B (en) | 2005-04-11 |
| CN100533903C (en) | 2009-08-26 |
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