CN208255346U - A kind of drawing road does not have a power failure DC earthing detection device - Google Patents

A kind of drawing road does not have a power failure DC earthing detection device Download PDF

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Publication number
CN208255346U
CN208255346U CN201820889787.5U CN201820889787U CN208255346U CN 208255346 U CN208255346 U CN 208255346U CN 201820889787 U CN201820889787 U CN 201820889787U CN 208255346 U CN208255346 U CN 208255346U
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Prior art keywords
switch
terminal
road
connect
power failure
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CN201820889787.5U
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Chinese (zh)
Inventor
胡道平
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Lubuge Hydroelectric Power Plant of Peak and Frequency Regulation Power Plant of China Southern Power Grid Co Ltd
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Lubuge Hydroelectric Power Plant of Peak and Frequency Regulation Power Plant of China Southern Power Grid Co Ltd
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Application filed by Lubuge Hydroelectric Power Plant of Peak and Frequency Regulation Power Plant of China Southern Power Grid Co Ltd filed Critical Lubuge Hydroelectric Power Plant of Peak and Frequency Regulation Power Plant of China Southern Power Grid Co Ltd
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Abstract

Do not have a power failure DC earthing detection device the utility model discloses a kind of drawing road, including cabinet and it is located in the box body the power switch being sequentially connected in series, isolating transformer, automatic coupling voltage regulator, rectifying and wave-filtering element and dc switch, the leading-out terminal of dc switch is connected with two connecting lines, the end of every connecting line is provided with connecting terminal, voltmeter is parallel on dc switch, the utility model is when in use, connecting terminal is linked into the leading-out terminal rear positions of circuit branch switch, it adjusts voltage and closes dc switch close to after 0, branch switch is disconnected again, the power supply of branch in this way is provided by the present apparatus, if this when of bus insulation restores, then earth fault is just in the branch, if bus insulation does not restore, check other branches, the utility model structure is simple, earth fault is searched accurate, and it in the detection process can be right Detection branch is powered, and has significant economic value and social value.

Description

A kind of drawing road does not have a power failure DC earthing detection device
Technical field
The utility model relates to the detection device technology fields of DC circuit insulation fault, and in particular to a kind of drawing Lu Buting Electric DC earthing detection device.
Background technique
Important industrial equipment is generally used double DC power-supply systems, this is because direct current system can connect electric power storage Pond, when exchanging power failure by storage battery power supply, therefore direct current system will not interruption of power supply.In order to improve direct current system work can By property, it is generally used earth-free mode, in operation, if being a little grounded for direct current system, generally will not influence and be The normal operation of system, but the insulation monitoring device of system can issue alarm, need to immediately treat, and in case of two points ground fault, be System is possible to that catastrophe failure, such as the protective device tripping of electric system occurs, it is therefore desirable to after one point earth occurs, to the greatest extent It is fast to search fault point and exclude.
There are many online, offline DC earthing detection devices on the market, for numerous and complicated DC load system, Its testing result can only provide reference, can not accurately provide foundation, and the grounding point of DC earthing searches difficulty, using drawing road When lookup method detects grounding point, although the result of detection determines accurately, it will cause load power failure, be unfavorable for industrial hold Continuous steady demand.Therefore, it is simple to develop a kind of structure, it is accurate that earth fault is searched, and in the detection process can be right The drawing road that detection branch the is powered DC earthing detection device that do not have a power failure is desirability.
Utility model content
The purpose of this utility model is to provide a kind of structure is simple, it is accurate that earth fault is searched, and in detection process In can not have a power failure to the drawing road that detection branch is powered DC earthing detection device.
The purpose of this utility model is achieved in that the utility model includes that cabinet and being located in the box body is sequentially connected in series Power switch, isolating transformer, automatic coupling voltage regulator, rectifying and wave-filtering element and dc switch, the primary side and power supply of isolating transformer The primary side of switch connection, secondary side and automatic coupling voltage regulator connects, and the secondary side of automatic coupling voltage regulator and the input terminal of rectifying and wave-filtering element connect It connects, the output end of rectifying and wave-filtering element is connect with dc switch, and the leading-out terminal of dc switch is connected with two connecting lines, every company The end of wiring is provided with connecting terminal, is parallel with voltmeter on dc switch.
Further, rectifying and wave-filtering element includes concatenated rectifier bridge and filter, the ac input end of rectifier bridge with from The secondary side of coupling pressure regulator connects, and the input terminal of DC output end and filter connects, and the output end and dc switch of filter connect It connects.
Further, filter includes low frequency filtering element and High frequency filter element in parallel.
Further, low frequency filtering element is the electrolytic capacitor of large capacity, and High frequency filter element is the tile electricity of low capacity Hold.
Further, connecting terminal includes fixed part and movable part, and fixed part includes fixed briquetting, operation handle and insulation Sheath, the upper surface of fixed briquetting are machined with fixed indent, and one end of operation handle is removably connect with fixed briquetting, another End is connect with connecting line, and insulating sheath is set in operation handle, and movable part includes sequentially connected movable holddown, be flexible coupling piece And link block, the end of movable holddown are provided with hold-down bolt, link block is removably connect with fixed block.
Further, the upper and lower surface of movable holddown is provided with one layer of rubber sheet gasket.
When the utility model is used, power switch is connected to mains AC, connecting terminal is linked into circuit branch The leading-out terminal of switch obtains the voltage difference of the present apparatus and test point by voltmeter, then adjusts automatic coupling voltage regulator, voltage is allowed to connect Dc switch is closed after nearly 0, then disconnects branch switch, and the power supply of such branch is provided by the present apparatus, and branch is still within normally Operating status, this when observing system bus insulation situation, if bus insulation restore, earth fault is just in this point Branch, if bus insulation does not restore, repeats the above process, other branches is checked, until finding earth fault.This is practical new Type structure is simple, and it is accurate that earth fault is searched, and can be powered in the detection process to detection branch, has significant Economic value and social value.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model;
Fig. 2 is the structural schematic diagram of the utility model connecting terminal.
In figure: 1- cabinet, 2- power switch, 3- isolating transformer, 4- automatic coupling voltage regulator, 5- rectifying and wave-filtering element, 51- are whole Stream bridge, 52- filter, 53- low frequency filtering element, 54- High frequency filter element, 6- dc switch, 61- voltmeter, 7- connecting line, 8- connecting terminal, 80- screw hole, the fixed briquetting of 81-, 82- operation handle, 83- insulating sheath, the fixed indent of 84-, 85- activity pressure Block, 86- are flexible coupling piece, 87- link block, 88- hold-down bolt, 89- rubber sheet gasket, 9- direct current system, 91- DC bus, and 92- points Zhi Kaiguan.
Specific embodiment
The utility model will be further described below with reference to the accompanying drawings, but is not subject in any way to the utility model Limitation instructs made any changes and modifications based on the utility model, belongs to the protection scope of the utility model.
As shown in Fig. 1~2, the utility model includes cabinet 1 and the power switch being sequentially connected in series in cabinet 12, isolation Transformer 3, automatic coupling voltage regulator 4, rectifying and wave-filtering element 5 and dc switch 6, the primary side and power switch 2 of isolating transformer 3 connect It connecing, secondary side is connect with the primary side of automatic coupling voltage regulator 4, and the secondary side of automatic coupling voltage regulator 4 is connect with the input terminal of rectifying and wave-filtering element 5, The output end of rectifying and wave-filtering element 5 is connect with dc switch 6, and the leading-out terminal of dc switch 6 is connected with two connecting lines 7, even When connecing, two connecting lines 7 are accessed to the positive and negative anodes DC bus 91 of direct current system 9, the end of every connecting line 7 respectively by polarity It is provided with connecting terminal 8, voltmeter 61 is parallel on dc switch 6.
The input terminal of power switch 2 connects reliable 220V, 50Hz AC power source, and output end is connect with isolating transformer 3, Isolating transformer 3 is used for electrical isolation, and automatic coupling voltage regulator 4 is for voltage adjusting, by the voltage readings on voltmeter 61 close to 0, This be from automatic coupling voltage regulator 4 export voltage it is identical with the voltage of direct current system branch, convenient for replace direct current system power supply, this dress It sets after being connect with the leading-out terminal of branch switch 92, the voltage difference of the present apparatus and direct current system 9 is able to reflect by voltmeter 61, lead to Automatic coupling voltage regulator 4 is overregulated, voltage is allowed to close dc switch 6 close to after 0, is then turned off branch switch 92, it can stable handle Branch's load switch to the present apparatus power supply, at this time if 91 insulation recovery of DC bus, earth fault just in this branch, if Failure still, continues to search other branches.
The present apparatus occurs after the insulation of certain branch reduces in direct current isolated neutral system, can be convenient and be connected to branch switch 92 Leading-out terminal, adjust present apparatus output voltage it is consistent with 9 supply voltage of direct current system after, disconnect branch switch 92, the branch bear Lotus is immediately transferred to the present apparatus, and the power supply of voltage and branch to direct current system 9 will not all impact.
Preferable rectifying and wave-filtering effect in order to obtain so that alternating current stablized by obtaining output after rectifying and wave-filtering element 5, The direct current that waveform is straight, rectifying and wave-filtering element 5 include concatenated rectifier bridge 51 and filter 52, and the exchange of rectifier bridge 51 inputs End connect with the secondary side of automatic coupling voltage regulator 4, DC output end is connect with the input terminal of filter 52, the output end of filter 52 and Dc switch 6 connects, and filter 52 includes low frequency filtering element 53 and High frequency filter element 54 in parallel, low frequency filtering element 53 For the electrolytic capacitor of large capacity, High frequency filter element 54 is the ceramic disc capacitor of low capacity.
Connecting terminal 8 includes fixed part and movable part, and fixed part includes fixed briquetting 81, operation handle 82 and insulating sheath 83, the upper surface of fixed briquetting 81 is machined with fixed indent 84, and one end of operation handle 82 removably connects with fixed briquetting 81 It connects, the other end is connect with connecting line 7, and insulating sheath 83 is set in operation handle 82, and movable part includes sequentially connected activity Briquetting 85, be flexible coupling piece 86 and link block 87, is provided with hold-down bolt 88 on movable holddown 85, and link block 87 is removably and solid Level pressure block 81 connects, and the upper and lower surface of movable holddown 85 is provided with one layer of rubber sheet gasket 89, and the effect of rubber sheet gasket 89 is anti- Only hold-down bolt 88 falls off in the loosened condition.
The mode of connection of connecting terminal 8 are as follows: hold insulating sheath 83, two connecting terminals 8 are connect respectively by positive-negative polarity Enter the leading-out terminal of 9 branch switch 92 of direct current system, i.e., the conductor of 92 leading-out terminal of branch switch is placed in the fixed briquetting of connecting terminal 8 Between 81 and movable holddown 85, hold-down bolt 88 is then screwed, the lower end of hold-down bolt 88 is screwed into screw hole 80, activity pressure Block 85 is pressed down by the toughness for the piece 86 that is flexible coupling, so that conductor is fixed in fixed indent 84, is completed conducting wire and is connected work.
Use the process of present apparatus detection DC earthing are as follows: in order to guarantee safety, first ensure that power switch 2 and direct current are opened It closes 6 to be in an off state, looks for a reliable AC single phase power supply to be connected to the input terminal of installation's power source switch 2, then will connect Line terminals 8 are linked into the leading-out terminal of 9 branch switch 92 of direct current system, and concrete operations are: insulating sheath 83 are held, by positive-negative polarity Respectively the leading-out terminal of 9 branch switch 92 of access direct current system of two connecting terminals 8, i.e. leading 92 leading-out terminal of branch switch Body is placed between the fixed briquetting 81 of connecting terminal 8 and movable holddown 85, then tightens hold-down bolt 88, is completed conducting wire and is connected work Make, checks each portion's line situation of the present apparatus, after confirmation is errorless, power turn-on switch 2 powers on, and pays attention at this moment dc switch 6 It is in an off state, then reads the reading of voltmeter 61, the direct current of present apparatus output is shown on voltmeter 61 at this time Voltage difference between pressure and direct current system 9 adjusts automatic coupling voltage regulator 4, allows the pointer of voltmeter 61 to be directed toward 0 scale, that is, allow The DC voltage of present apparatus output and the voltage of direct current system 9 are equal, finally close dc switch 6, allow the direct current of the present apparatus Direct current system 9(is incorporated to due to there is isolating transformer 3 as electricity isolation device, two systems will not influence each other), then draw The branch switch 92 of direct current system 9 is opened, the load after 92 leading-out terminal of branch switch at this time will turn to be powered by the present apparatus, straight with original Streaming system 9 is fully disconnected, and next can be judged failure point of DC grounding, if failure point of DC grounding is in this point Zhi Shang is that the insulation of the branch reduces, then the alarm signal of DC earthing will disappear in direct current system 9 at this time, conversely, such as Fruit alarm signal does not disappear, and just illustrates that the branch does not have failure point of DC grounding, failure point of DC grounding is still present in directly In streaming system 9, just connecting terminal 8 is accessed in next branch, is repeated the above process, until finding failure point of DC grounding, It can realize that drawing road not have a power failure finds the purpose of failure point of DC grounding by the above process.

Claims (6)

  1. The DC earthing detection device 1. a kind of drawing road does not have a power failure, it is characterised in that: including cabinet (1) and be located at cabinet (1) according to Secondary concatenated power switch (2), isolating transformer (3), automatic coupling voltage regulator (4), rectifying and wave-filtering element (5) and dc switch (6), The primary side of the isolating transformer (3) is connect with power switch (2), and secondary side is connect with the primary side of automatic coupling voltage regulator (4), it is described from The secondary side of coupling pressure regulator (4) is connect with the input terminal of rectifying and wave-filtering element (5), the output end of the rectifying and wave-filtering element (5) with Dc switch (6) connection, the leading-out terminal of the dc switch (6) are connected with two connecting lines (7), the end of every connecting line (7) End is provided with connecting terminal (8), is parallel with voltmeter (61) on the dc switch (6).
  2. The DC earthing detection device 2. a kind of drawing road according to claim 1 does not have a power failure, it is characterised in that: the rectification filter Wave element (5) includes concatenated rectifier bridge (51) and filter (52), the ac input end and automatic coupling voltage regulator of rectifier bridge (51) (4) secondary side connection, DC output end are connect with the input terminal of filter (52), the output end and dc switch of filter (52) (6) it connects.
  3. The DC earthing detection device 3. a kind of drawing road according to claim 2 does not have a power failure, it is characterised in that: the filter It (52) include low frequency filtering element (53) and High frequency filter element (54) in parallel.
  4. The DC earthing detection device 4. a kind of drawing road according to claim 3 does not have a power failure, it is characterised in that: the low frequency filter Wave element (53) is the electrolytic capacitor of large capacity, and High frequency filter element (54) is the ceramic disc capacitor of low capacity.
  5. The DC earthing detection device 5. a kind of drawing road according to claim 1 does not have a power failure, it is characterised in that: the terminals Sub (8) include fixed part and movable part, and the fixed part includes fixed briquetting (81), operation handle (82) and insulating sheath (83), the upper surface of fixed briquetting (81) is machined with fixed indent (84), one end of operation handle (82) removably with fixation Briquetting (81) connection, the other end are connect with connecting line (7), and insulating sheath (83) is set on operation handle (82), the activity Portion includes sequentially connected movable holddown (85), the piece that is flexible coupling (86) and link block (87), the end setting of movable holddown (85) Have hold-down bolt (88), link block (87) is removably connect with fixed briquetting (81).
  6. The DC earthing detection device 6. a kind of drawing road according to claim 5 does not have a power failure, it is characterised in that: the activity pressure The upper and lower surface of block (85) is provided with one layer of rubber sheet gasket (89).
CN201820889787.5U 2018-06-09 2018-06-09 A kind of drawing road does not have a power failure DC earthing detection device Active CN208255346U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201820889787.5U CN208255346U (en) 2018-06-09 2018-06-09 A kind of drawing road does not have a power failure DC earthing detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201820889787.5U CN208255346U (en) 2018-06-09 2018-06-09 A kind of drawing road does not have a power failure DC earthing detection device

Publications (1)

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CN208255346U true CN208255346U (en) 2018-12-18

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110542829A (en) * 2019-08-15 2019-12-06 贵州电网有限责任公司 direct-current grounding judgment device and method for power distribution network below 35kV

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110542829A (en) * 2019-08-15 2019-12-06 贵州电网有限责任公司 direct-current grounding judgment device and method for power distribution network below 35kV

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