CN203039423U - Two direct current switching circuits of DEH - Google Patents

Two direct current switching circuits of DEH Download PDF

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Publication number
CN203039423U
CN203039423U CN2012207160775U CN201220716077U CN203039423U CN 203039423 U CN203039423 U CN 203039423U CN 2012207160775 U CN2012207160775 U CN 2012207160775U CN 201220716077 U CN201220716077 U CN 201220716077U CN 203039423 U CN203039423 U CN 203039423U
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China
Prior art keywords
direct current
loop
deh
power supply
load
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Active
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CN2012207160775U
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Chinese (zh)
Inventor
杜志勇
王继辉
张君
张磊
李秋盈
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China Resources Power Dengfeng Co Ltd
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China Resources Power Dengfeng Co Ltd
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Abstract

The utility model discloses two direct current switching circuits of a DEH. The two direct current switching circuits of the DEH comprise a first direct current circuit, a second direct current circuit, two normally open contacts which are arranged on the first direct current circuit, a relay, and two normally closed contacts which are arranged in the second direct current circuit. According to the two direct current switching circuits of the DEH, which is provided by the utility model, the relay controls the working states of the two normally open contacts and the two normally closed contacts; when two direct current power supplies supply power, both ends of the relay are powered, so that the two normally open contacts are automatically closed, and at the same time the two normally closed contacts automatically turn off. At the moment, only the first direct current circuit is conducted, and the first direct current power supply powers a load. When the first direct current power supply is cut off, both ends of the relay power lose power, so that the two normally open contacts reset and turn off, and the two normally closed contacts reset and are closed. At the moment, only the second direct current circuit is conducted, and the second direct current power supply powers the load. According to the utility model, the two direct current circuits are independent of each other, and the phenomenon of current circulation is prevented.

Description

The two-way direct current switching circuit of a kind of DEH
Technical field
The utility model relates to the digital electrohydraulic control system technical field, particularly the two-way direct current switching circuit of a kind of DEH.
Background technology
The recurrent abnormal conditions of low-voltage direct system of electric power system are exactly negative or positive electrode ground connection (DC earthing refers to that direct current system and load lead-in wire negative or positive electrode thereof contact with device housings or the reduction of insulating), in order to reduce the coverage of above-mentioned abnormal conditions in electrical network, according to national relevant regulations, the feeding out network and should adopt radial supply power mode of direct current system, make between each loop independent of one another, non-interference, if what the equipment that is using adopted is the looply connected power supply mode, should be transformed into radial supply power mode.
For transforming the DEH(digital electrohydraulic control system) two-way direct current (220V or 110V) loop, separate to realize between the two-way DC loop, a kind of prior art is to utilize self unilateal conduction performance of diode to realize the isolation of two-way DC loop, as shown in Figure 1, but after the two-way DC power supply puts into operation simultaneously, can't realize the independence of two DC loop, the cyclization of two DC loop can take place, form circulation; Under the normal condition, first DC loop is by first positive pole 001, load 005 and first negative pole 002 are formed, but first positive pole 001, load 005 and second negative pole 004 also can form a loop, in like manner, second DC loop is by second positive pole 003, load 005, second negative pole 004 is formed, but second positive pole 003 can and load 005 and first negative pole 002 between form a loop, as can be seen, not independent between first DC loop and second DC loop, can make two insulation detection device mistakes in two loops send out the warning that the direct current system insulation reduces like this, cause producers can not distinguish that whether the direct current system insulating properties really reduces, and has influenced the ordinary production in power plant; And the fault in case a certain direct current loop is short-circuited etc., because the existence of cyclization, two DC loop are drawn the direct current system that connects can whole dead electricity, cause catastrophic consequence for electrical network and power plant, have great potential safety hazard.
In sum, how guaranteeing between the DEH two-way DC loop separately, avoid circulation to occur, is those skilled in the art's problem demanding prompt solutions.
The utility model content
The purpose of this utility model is to provide the two-way direct current switching circuit of a kind of DEH, and is separate to guarantee between the DEH two-way DC loop, avoids circulation to occur.
For solving the problems of the technologies described above, the utility model provides following scheme:
The two-way direct current switching circuit of a kind of DEH comprises: first DC loop that is connected to form by first positive pole, load, first negative pole, second DC loop that is connected to form by second positive pole, described load and second negative pole;
The intersection point of described first DC loop and described second DC loop is first fulcrum and second fulcrum;
Also comprise:
Be arranged on first normally opened contact between described first positive pole and described first fulcrum;
Be arranged on second normally opened contact between described first negative pole and described second fulcrum;
Be arranged on first normally-closed contact between described second positive pole and described first fulcrum;
Be arranged on second normally-closed contact between described second negative pole and described second fulcrum;
Two ends respectively with the described first anodal relay that is connected with described first negative pole.
Preferably, in the two-way direct current switching circuit of above-mentioned DEH, also comprise:
Connect described first anodal and described second positive pole and be connected described first negative pole and described the
The interconnection switch of two negative poles.
Preferably, in the two-way direct current switching circuit of above-mentioned DEH, also comprise:
Be arranged on first mains switch of described first DC loop;
Be arranged on the second source switch of described second DC loop.
Preferably, in the two-way direct current switching circuit of above-mentioned DEH, power supply is 220V or 110V DC power supply.
Compared with prior art, the beneficial effects of the utility model are:
The two-way direct current switching circuit of the DEH that the utility model provides, relay in parallel in first DC loop, and first normally opened contact and second normally opened contact are set, first normally-closed contact and second normally-closed contact are set in second DC loop; When two DC power supply are all powered, the relay two ends get electric, and relay is controlled first normally opened contact and the second normally opened contact closure, and first normally-closed contact and second normally-closed contact disconnect simultaneously, having only the first DC loop conducting this moment, is the load power supply by first DC power supply; When the outage of first DC power supply, relay two ends dead electricity makes two normally opened contacts disconnect, and two normally-closed contact closures at this moment, have only the second DC loop conducting simultaneously, is the load power supply by second DC power supply; As can be seen, at work, above-mentioned two DC loop have only one tunnel DC loop conducting, by load, and are load power supply by a DC power supply, and are therefore separate between two DC loop, the phenomenon of two DC loop circulation can not occur.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or scheme of the prior art, to do simple the introduction to the accompanying drawing of describing required use in embodiment or the prior art below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those skilled in the art, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The rough schematic view of the two-way direct current switching circuit of a kind of DEH that Fig. 1 provides for prior art;
The rough schematic view of the two-way direct current switching circuit of a kind of DEH that Fig. 2 provides for the utility model embodiment;
The rough schematic view of the two-way direct current switching circuit of the another kind of DEH that Fig. 3 provides for the utility model embodiment.
Among above-mentioned Fig. 1-Fig. 3:
First positive pole 001, first negative pole 002, second positive pole 003, second negative pole 004, load 005;
First positive pole 101, first negative pole 102, second positive pole 103, second negative pole 104, first normally opened contact 105, second normally opened contact 106, first normally-closed contact 107, second normally-closed contact 108, first fulcrum 109, second fulcrum 110, relay 111, load 112, first mains switch 113, second source switch 114, interconnection switch 115, the first bypass load 116, the second bypass load 117.
Embodiment
The utility model provides the two-way direct current switching circuit of a kind of DEH, has guaranteed separate between the DEH two-way DC loop to have avoided the circulation appearance.
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is a part of embodiment of the present utility model, rather than whole embodiment.Based on embodiment of the present utility model, all other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work belong to the scope that the utility model is protected.
Please refer to Fig. 2, the rough schematic view of the two-way direct current switching circuit of a kind of DEH that Fig. 2 provides for the utility model embodiment; The rough schematic view of the two-way direct current switching circuit of the another kind of DEH that Fig. 3 provides for the utility model embodiment.
As shown in Figure 2, the two-way direct current switching circuit of the DEH that the utility model embodiment provides, comprise two DC loop, wherein, first DC loop is connected to form by first positive pole 101, load 112 and first negative pole 102, and second DC loop is connected to form by second positive pole 103, load 112 and second negative pole 104; First DC loop and the second DC loop shared load 112, then the intersection point of one DC loop and second DC loop is two, i.e. first fulcrum 109 and second fulcrum 110; Also comprise first normally opened contact 105 and second normally opened contact 106 that are arranged in first DC loop, namely between first anodal 101 and first fulcrum 109, first normally opened contact is set, between first negative pole 102 and second fulcrum 110, second normally opened contact 106 is set; Also comprise first normally-closed contact 107 and second normally-closed contact 108 that are arranged in second DC loop, namely between second anodal 103 and first fulcrum 109, first normally-closed contact 107 is set, between second negative pole 104 and second fulcrum 110, second normally-closed contact 108 is set; In first DC loop, the relay (KM) 111 in parallel with load 112 is installed, the two ends of relay 111 are without any element, directly are connected with first negative pole 102 with first positive pole 101.
The operation principle of the two-way direct current switching circuit of above-mentioned DEH is: relay 111 is being controlled the operating state of two normally opened contacts and two normally-closed contacts, when relay 111 two ends do not have electricity, two normally opened contacts are in the nature off-state, two normally-closed contacts are in the nature closure state, when there is electricity at relay two ends two, two normally opened contact closures of relay control, simultaneously, two normally-closed contacts disconnect; Above-mentioned principle according to relay 111, to realize the independent operating of two DC loop, concrete work is as follows, and two DC power supply are respectively first DC loop and the power supply of second DC loop simultaneously, at this moment, relay 111 two ends get, two normally opened contact auto-closings, two normally-closed contact automatic disconnections, at this moment, having only the first DC loop conducting, is load 112 power supplies by first DC power supply; If it is because unexpected, the first DC power supply dead electricity, has only second DC power supply, at this moment, relay 111 two ends do not have electricity, and then two normally opened contacts restore and disconnect, two normally-closed contacts restore closed, this moment, first DC loop was cut off conducting, and second DC loop begins conducting, and was load 112 power supplies by second DC power supply; Above-mentioned two DC loop are independent fully, existing in prior technology two-way circulation phenomenon can not take place, therefore, insulating monitoring instrument in two DC loop can not reduce and false alarm because of the caused insulating properties of two-way circulation, thereby guaranteed the ordinary production in power plant, and the accident that happens suddenly in a certain DC loop can not have influence on another DC loop, has eliminated serious potential safety hazard.
In order further to optimize the two-way direct current switching circuit of above-mentioned DEH, the utility model embodiment also comprises an interconnection switch 115, and interconnection switch is connected with second anodal 103 first anodal 101, simultaneously first negative pole 102 is connected with second negative pole 104; The effect of interconnection switch 115 is: when first DC power supply accident dead electricity, the temporary transient conducting of second DC loop, make load 112 keep power supply state, after the staff reaches the spot, with interconnection switch 115 closures, this moment, second DC power supply was the power supply of first DC loop, the conducting again of first DC loop, and load 112 is worked in first DC loop; The reason of doing like this be because, as shown in Figure 3, first DC power supply not only is load 112 power supplies, load 112 is a part of load of DEH just, also there is first bypass in the two ends of first DC power supply, first bypass is provided with the first bypass load 116, as long as when first DC power supply, first bypass will conducting, the first bypass load 116 is in power supply state, for the first bypass load 116 that guarantees DEH also operate as normal, so when the unexpected dead electricity of first DC power supply, with interconnection switch 115 closures, replacing first DC power supply by second DC power supply is the first bypass load 116 and load 112 power supplies simultaneously; In addition, there is second bypass at the two ends of second DC power supply, and directly is the second bypass load 117 power supply in second bypass by second DC power supply; In sum, all in the normal power supply, interconnection switch 115 is in open position, is load 112 and the first bypass load, 116 power supplies simultaneously by first DC power supply in two DC power supply, and is the second bypass load, 117 power supplies by second DC power supply; If the unexpected dead electricity of first DC power supply with interconnection switch 115 closures, is three loads (being whole DEH load) power supplies by second DC power supply simultaneously; If the unexpected dead electricity of second dc switch equally with interconnection switch 115 closures, is three load power supplies by first DC power supply simultaneously; Above-mentioned three kinds of situations because the existence of interconnection switch 115 has guaranteed that the load of whole DEH is in power supply state constantly, make the DEH operate as normal.
Control the power supply of two DC power supply for convenience, the utility model embodiment first DC loop is provided with first mains switch 113; In second DC loop second source switch 114 is set, realizes the power supply control to first DC loop and second DC loop respectively.
It is the 220VDC(220 direct current that power supply among the utility model embodiment adopts pressure reduction) or the 110VDC(110 direct current) DC power supply.
For two DC loop, relay 111 can be installed on any one DC loop, and what above-described embodiment adopted is that relay 111 is installed in first DC loop; Certainly, can also be installed in second DC loop, correspondingly, two normally opened contacts with two normally-closed contact transpositions, be satisfied the separate requirement of two DC loop equally.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from spirit or scope of the present utility model in other embodiments herein.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet the wideest scope consistent with principle disclosed herein and features of novelty.

Claims (4)

1. the two-way direct current switching circuit of a DEH, comprise: first DC loop that is connected to form by first positive pole (101), load (112), first negative pole (102), second DC loop that is connected to form by second positive pole (103), described load (112) and second negative pole (104);
The intersection point of described first DC loop and described second DC loop is first fulcrum (109) and second fulcrum (110);
It is characterized in that, also comprise:
Be arranged on first normally opened contact (105) between described first positive pole (101) and described first fulcrum (109);
Be arranged on second normally opened contact (106) between described first negative pole (102) and described second fulcrum (110);
Be arranged on first normally-closed contact (107) between described second positive pole (103) and described first fulcrum (105);
Be arranged on second normally-closed contact (108) between described second negative pole (104) and described second fulcrum (110);
The relay (111) that two ends are connected with described first negative pole (102) with described first positive pole (101) respectively.
2. according to the two-way direct current switching circuit of the described DEH of claim 1, it is characterized in that, also comprise:
Connect described first positive pole (101) with described second positive pole (103) and be connected described first negative pole (102) and the interconnection switch (115) of described second negative pole (104).
3. according to the two-way direct current switching circuit of the described DEH of claim 1, it is characterized in that, also comprise:
Be arranged on first mains switch (113) of described first DC loop;
Be arranged on the second source switch (114) of described second DC loop.
4. according to the two-way direct current switching circuit of the described DEH of claim 1, it is characterized in that power supply is 220V or 110V DC power supply.
CN2012207160775U 2012-12-21 2012-12-21 Two direct current switching circuits of DEH Active CN203039423U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012207160775U CN203039423U (en) 2012-12-21 2012-12-21 Two direct current switching circuits of DEH

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012207160775U CN203039423U (en) 2012-12-21 2012-12-21 Two direct current switching circuits of DEH

Publications (1)

Publication Number Publication Date
CN203039423U true CN203039423U (en) 2013-07-03

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104638633A (en) * 2015-02-06 2015-05-20 孙毅彪 Composite intelligent high power arc-free direct current bus contact device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104638633A (en) * 2015-02-06 2015-05-20 孙毅彪 Composite intelligent high power arc-free direct current bus contact device

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