CN110412399A - A kind of double split-core type meter formula DC earthing searching instruments - Google Patents
A kind of double split-core type meter formula DC earthing searching instruments Download PDFInfo
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- CN110412399A CN110412399A CN201910797098.0A CN201910797098A CN110412399A CN 110412399 A CN110412399 A CN 110412399A CN 201910797098 A CN201910797098 A CN 201910797098A CN 110412399 A CN110412399 A CN 110412399A
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- 238000009413 insulation Methods 0.000 claims description 15
- 238000005259 measurement Methods 0.000 claims description 2
- 210000000080 chela (arthropods) Anatomy 0.000 description 6
- 230000005611 electricity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
Abstract
The invention discloses a kind of double split-core type meter formula DC earthing searching instruments, in DC power system, the DC power system to include insulating monitor, including electric bridge switch and current measurer；Positive terminal, negative terminal and the ground terminal of the electric bridge switch are for connecing respectively in the anode of DC bus, the cathode of DC bus and grounded screen；The current measurer includes measuring appliance ontology and the main split-core type meter being connected with measuring appliance ontology and secondary split-core type meter；The measuring appliance ontology is provided with display screen, for showing current waveform detected by main split-core type meter and/or secondary split-core type meter.Double split-core type meter formula DC earthing searching instruments provided in this embodiment since its current measurer has double split-core type meter, that is, major and minor two split-core type meters, can under different state status, can accurately measure DC power system positive and negative anodes Grounding, it is applied widely.
Description
Technical field
The present invention relates to power equipments, and in particular to a kind of double split-core type meter formula DC earthing searching instruments.
Background technique
DC power system is to provide working power for automation equipments such as protection, control, monitoring, records in substation
Multiple-limb network.Since direct current system is run using the earth-free mode of positive and negative anodes, and in network, there are biggish distribution electricity
Hold, damage in insulation is possible to become the root for causing secondary device tripping malfunction.Therefore it is reduced when insulation occurs in direct current system
When, it is necessary to it handles as early as possible, in order to avoid lead to more major break down.
DC earthing searching instrument used in substation is all based on greatly unbalanced bridge principle at present, and device is cut by electric bridge
Parallel operation and current measurer two parts are constituted.When using the device, first three terminals of electric bridge switch are connect respectively in direct current
The anode of bus, the cathode of DC bus, in grounded screen, direct current positive and negative anodes bus is periodically passed through one by electric bridge switch respectively
A big resistance eutral grounding, if DC power system branching networks happens is that plus earth, when electric bridge switch cathode ground connection, just
It is formed into a loop before cathode by earth mat, the current measurer clamped on the anode branch road can measure leakage current at this time；
When electric bridge switch plus earth, the grounding point of branching networks cannot be formed into a loop with cathode, and current measurer is not capable of measuring
To leakage current.Since there may be load currents in DC power supply branching networks, when ground resistance is larger or load current is larger
When, load current is more much bigger than leakage current, when electric bridge switch switches earth bus, clamps the current measurer on monopole branch road
It is difficult to show leakage current situation of change at this time.
Summary of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, a kind of double split-core type meter formula DC earthing searchings are provided
Instrument, in order under different state status, can accurately measure DC power supply positive and negative anodes Grounding.
To achieve the above object, the technical scheme is that
A kind of double split-core type meter formula DC earthing searching instruments, in DC power system, the DC power system to include exhausted
Edge monitor, including electric bridge switch and current measurer；
Positive terminal, negative terminal and the ground terminal of the electric bridge switch are for connecing respectively in direct current
In the anode of bus, the cathode of DC bus and grounded screen；
The current measurer includes measuring appliance ontology and the main split-core type meter being connected with measuring appliance ontology and secondary split-core type meter；Institute
It states measuring appliance ontology and is provided with display screen, for showing current waveform detected by main split-core type meter and/or secondary split-core type meter.
Further, when the ground branch and polarity chron of the quoted DC power system of the insulation tester, by electric current
The main split-core type meter pincers of measuring appliance correspond in the wiring of pole in the ground branch, if the waveform that current measurer is shown is square wave or close side
Wave, then it represents that the ground branch that insulation tester is quoted is correct.
Further, when the ground branch and polarity chron of the quoted DC power system of the insulation tester, by electric current
The main split-core type meter pincers of measuring appliance correspond in the wiring of pole in the ground branch, if the display screen display waveform of current measurer is non-square wave
And the main split-core type meter of current measurer is clamped while being clamped when can measure simultaneously and only measure the positive and negative electrode current of the ground branch by main split-core type meter
The firmly ground branch positive and negative anodes wiring judges Grounding with the waveform shown according to current measurer, if current measurer
The waveform of display is square wave or close to square wave, then it represents that the ground branch that insulation tester is quoted is correct.
Further, when the ground branch and polarity chron of the quoted DC power system of the insulation tester, by electric current
The main split-core type meter pincers of measuring appliance correspond in the wiring of pole in the ground branch, if the display screen display waveform of current measurer is non-square wave
And main split-core type meter will vise the main split-core type meter of current measurer when cannot measure simultaneously and only measure the positive and negative electrode current of the ground branch
The ground branch corresponds in the wiring of pole, and secondary split-core type meter vises the ground branch antipode wiring, with what is shown according to current measurer
Waveform judges Grounding, if the waveform that current measurer is shown is square wave or close to square wave, then it represents that insulation tester institute
The ground branch quoted is correct.
Compared with prior art, the present invention the beneficial effect is that:
Double split-core type meter formula DC earthing searching instruments provided in this embodiment have double split-core type meters, that is, major and minor due to its current measurer
Two split-core type meters, can under different state status, can accurately measure DC power system positive and negative anodes Grounding,
It is applied widely.
Detailed description of the invention
Fig. 1 is the use state diagram one of double split-core type meter formula DC earthing searching instruments provided in an embodiment of the present invention；
Fig. 2 is the use state diagram two of double split-core type meter formula DC earthing searching instruments provided in an embodiment of the present invention；
Fig. 3 is the use state diagram three of double split-core type meter formula DC earthing searching instruments provided in an embodiment of the present invention；
In figure: 1, electric bridge switch；2, current measurer；21, measuring appliance ontology；22, main split-core type meter；23, secondary split-core type meter.
Specific embodiment
The contents of the present invention are described in further details with reference to the accompanying drawings and detailed description.
Double split-core type meter formula DC earthing searching instruments, are used in DC power system, the DC power supply provided by the present embodiment
System includes insulating monitor, can be according to bus electricity since the insulating monitor is the corollary equipment of DC power system
Pressure and each branch current size judge system earth situation and ground branch, since insulating monitor is the conventional prior art,
No longer its structure construction and working principle are repeated herein.
Double split-core type meter formula DC earthing searching instruments include electric bridge switch 1 and current measurer 2；The electric bridge switch 1
Positive terminal, negative terminal and ground terminal be used to connect respectively the anode of DC bus, DC bus it is negative
On pole and grounded screen；And the current measurer 2 includes measuring appliance ontology 21 and the main pincers being connected with measuring appliance ontology 21
Table 22 and secondary split-core type meter 23；The measuring appliance ontology 21 is provided with display screen 210, for showing main split-core type meter 22 and/or secondary split-core type meter
Current waveform detected by 23, if 2 display waveform of current measurer is square wave or close to square wave, then indicate main split-core type meter and/or
The grounding that secondary split-core type meter is clamped, concrete principle are as follows:
When searching DC earthing, first three terminals of electric bridge switch 1 are connect respectively female in the anode of DC bus, direct current
On the cathode of line, grounded screen, the ground branch and polarity quoted according to insulating monitor, by the main split-core type meter of current measurer 2
Pincers 22 correspond in the wiring of pole in the branch, can determine that the branch if 2 display waveform of current measurer is for square wave or close to square wave
Ground connection, verifying insulating monitor result is correct, excludes the possibility of wrong report ground connection, continues the next stage branch for checking the branch, this
The usage mode of current measurer is as shown in attached drawing situation 1 in the case of kind: not using current measurer pair split-core type meter 23, is used only
The main split-core type meter pincers 22 of current measurer live ground branch and correspond to pole wiring, the waveform judgement ground connection feelings shown according to current measurer
Condition.Wherein, current measurer display waveform is square wave or can determine that the grounding concrete principle is as follows close to square wave: assuming that should
Branch plus earth, when negative electrode bus is grounded by electric bridge switch by big resistance, positive electrode bus → ground branch grounding point
→ electric bridge switch grounding point → negative electrode bus is formed into a loop, and flows through the substantially invariable leakage current of size in circuit；Work as electric bridge
When positive electrode bus is grounded by switch by big resistance, it can not be formed into a loop by grounding point between positive and negative anodes bus, at this time branch
Middle No leakage electric current；In a switching cycle of electric bridge switch, the leakage current flowed through in ground branch is only existed half
Period, current waveform are square wave or close to square wave.
If 2 display waveform of current measurer differs larger with square wave, illustrate that the load current of the branch compares leakage current
The much bigger or branch is earth-free, and at this time if positive and negative anodes branch wiring interval is close, split-core type meter can avoid other when measuring and non-connect
Ground leg, main split-core type meter can measure simultaneously and only measure the positive and negative electrode current of the branch, then it is positive and negative to measure the branch simultaneously with main split-core type meter
Electrode current is to eliminate influence of the load current to leakage current, to judge whether the branch is grounded, electric current is surveyed in this case
The usage mode of measuring device is as shown in attached drawing situation 2: not using current measurer pair split-core type meter 23, the main split-core type meter of current measurer is used only
22 vise ground branch positive and negative anodes wiring simultaneously, Grounding are judged according to the waveform that current measurer is shown, if current waveform
For square wave or close to square wave, then the ground branch that can determine that insulating monitor is quoted is correct, which is grounded really, if electric current
Waveform differs farther out with square wave, then can exclude the grounding substantially.
If current measurer display waveform differs larger with square wave, field wiring closely interlocks or same branch positive and negative anodes connect
Farther out, main split-core type meter cannot measure simultaneously and only measure the positive and negative electrode current of the branch at line interval, then with main split-core type meter measurement earthing pole electricity
Stream measures opposite electrode current with secondary split-core type meter, and secondary split-core type meter electric current negates and main split-core type meter electricity again after taking absolute value in current measurer
It flows absolute value superposition and offsets load current, leakage current is displayed on current measurer, judges the branch according to leakage current waveform
Whether it is grounded, the usage mode of current measurer is as shown in attached drawing situation 3 in this case: vises earthing pole with main split-core type meter 22 and connect
Line vises antipode wiring with secondary split-core type meter 23, Grounding is judged according to the waveform that current measurer 2 is shown, if current waveform
For square wave or close to square wave, then the ground branch that can determine that insulating monitor is quoted is correct, which is grounded really, if electric current
Waveform differs farther out with square wave, then can exclude the grounding substantially.
It is clamped it can be seen that double split-core type meter formula DC earthing searching instruments provided in this embodiment are double since its current measurer has
Table, that is, major and minor two split-core type meters, can under different state status, can accurately measure DC power system positive and negative anodes
Grounding, it is applied widely.
Simply to illustrate that technical concepts and features of the invention, its purpose is allows in the art above-described embodiment
Those of ordinary skill cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all
It is the equivalent changes or modifications that the essence of content according to the present invention is made, should be covered by the scope of protection of the present invention.
Claims (4)
1. a kind of double split-core type meter formula DC earthing searching instruments, in DC power system, the DC power system to include insulation
Monitor, which is characterized in that including electric bridge switch and current measurer；
Positive terminal, negative terminal and the ground terminal of the electric bridge switch are for connecing respectively in DC bus
Anode, DC bus cathode and grounded screen on；
The current measurer includes measuring appliance ontology and the main split-core type meter being connected with measuring appliance ontology and secondary split-core type meter；The survey
Measuring device ontology is provided with display screen, for showing current waveform detected by main split-core type meter and/or secondary split-core type meter.
2. double split-core type meter formula DC earthing searching instruments as described in claim 1, which is characterized in that when the insulation tester is reported
The main split-core type meter of current measurer is clamped and corresponds to pole wiring in the ground branch by the ground branch and polarity chron of DC power system out
On, if the waveform that shows of current measurer is square wave or close to square wave, then it represents that the ground branch that insulation tester is quoted is just
Really.
3. double split-core type meter formula DC earthing searching instruments as described in claim 1, which is characterized in that when the insulation tester is reported
The main split-core type meter of current measurer is clamped and corresponds to pole wiring in the ground branch by the ground branch and polarity chron of DC power system out
On, if the display screen display waveform of current measurer is non-square wave and main split-core type meter can measure simultaneously and only measure the ground branch just
When cathodal current, the main split-core type meter of current measurer is clamped while vising the ground branch positive and negative anodes wiring, according to current measurement
Waveform that device is shown judges Grounding, if the waveform that current measurer is shown is square wave or close to square wave, then it represents that insulation
The ground branch that detector is quoted is correct.
4. double split-core type meter formula DC earthing searching instruments as described in claim 1, which is characterized in that when the insulation tester is reported
The main split-core type meter of current measurer is clamped and corresponds to pole wiring in the ground branch by the ground branch and polarity chron of DC power system out
On, if the display screen display waveform of current measurer is non-square wave and main split-core type meter cannot measure simultaneously and only measure the ground branch
When positive and negative electrode current, corresponded to the main split-core type meter of current measurer is vised the ground branch in the wiring of pole, secondary split-core type meter vises this and connects
In ground leg antipode wiring, Grounding is judged with the waveform shown according to current measurer, if current measurer is shown
Waveform be square wave or close to square wave, then it represents that the ground branch that insulation tester is quoted is correct.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910797098.0A CN110412399A (en) | 2019-08-27 | 2019-08-27 | A kind of double split-core type meter formula DC earthing searching instruments |
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| CN201910797098.0A CN110412399A (en) | 2019-08-27 | 2019-08-27 | A kind of double split-core type meter formula DC earthing searching instruments |
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2019
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