CN203747254U - Low-voltage grounding resistor cabinet - Google Patents

Low-voltage grounding resistor cabinet Download PDF

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Publication number
CN203747254U
CN203747254U CN201420072898.9U CN201420072898U CN203747254U CN 203747254 U CN203747254 U CN 203747254U CN 201420072898 U CN201420072898 U CN 201420072898U CN 203747254 U CN203747254 U CN 203747254U
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CN
China
Prior art keywords
cabinet
low
box
controller
resistance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201420072898.9U
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Chinese (zh)
Inventor
史志勇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
QINGDAO SHICHI ELECTRIC CO Ltd
Original Assignee
QINGDAO SHICHI ELECTRIC CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by QINGDAO SHICHI ELECTRIC CO Ltd filed Critical QINGDAO SHICHI ELECTRIC CO Ltd
Priority to CN201420072898.9U priority Critical patent/CN203747254U/en
Application granted granted Critical
Publication of CN203747254U publication Critical patent/CN203747254U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model brings forward a low-voltage grounding resistor cabinet comprising a cabinet body. A louver ventilating opening is formed in the cabinet body; and a cabinet door is arranged in the front of the cabinet body. A support is arranged at the bottom of the cabinet body; and a ground resistor is arranged above the support. A controller box for accommodating a controller and an electrical apparatus element and a voltmeter box for accommodating a voltmeter are arranged above the cabinet door; and a terminal junction box is arranged below the cabinet door. And a temperature sensor is arranged at a resistor plate of the ground resistor. According to the scheme, the provided cabinet has the reasonable heat radiation structure. All units in the cabinet body are arranged in an upper-lower mode, so that the units are not influenced mutually and the space is saved. The controller box, a certain distance between the controller box, the voltmeter box, the terminal junction box, and the ground resistor is set, thereby reducing the influence by the resistor temperature. And the resistor element employs the grid structure and the optimum cooling air flow channel is realized, thereby avoiding occurrences of the local high temperature point and the easy firing point.

Description

A kind of low-voltage ground resistor box
Technical field
The utility model relates to a kind of power system device, specifically a kind of low-voltage ground resistor box.
Background technology
In order to improve 0.66/0.38/0.22(KV) low power used system power supply quality; the device powers down causing while reducing because of generation earth fault; in the main power house in power plant, low power used system should adopt high resistance ground; while so not only having avoided single-phase earthing, needn't trip immediately, thereby and adopt fuse to reduce the probability of burning when power consumption equipment moves as protective device.
Low-pressure system mainly adopted direct grounding way or earth-free mode in the past.In the time there is single phase ground fault, the neutral point voltage of solidly grounded system remains unchanged, but system neutral electric current is excessive, easily makes insulation breakdown, burns neutral point system.If when system adopts earth-free mode, the overvoltage of generation be rated voltage N doubly, because arc light and ferro-resonance over-voltage make the phase voltage rising several times of healthy phases, this insulation to power consumption equipment and thermally-stabilisedly all constitute a threat to.
" the Coal Electricity safety regulations " of China clearly specifies: the transformer of neutral-point solid ground and generator do not allow directly to underground power supply used.That is to say, the neutral point of colliery underground electric network does not allow direct ground connection.The main earth resistance mode that adopts now.
When installing after neutral-point grounding resistance cabinet, while there is non-metal earthing, be subject to the impact of earth point resistance, the electric current that flows through earth point and neutral point has remarkable reduction, and healthy phases voltage rising simultaneously also significantly reduces.
The resistance of resistance can be subject to the impact of temperature, therefore for the temperature control of the earthing resistance cabinet outbalance that just seems itself, need on radiating mode, carry out certain design, not only avoid the impact of temperature on resistance, also avoid localized hyperthermia or the easily appearance of calcination point.
Utility model content
The utility model proposes a kind of low-voltage ground resistor box, simple in structure, easy to use, when having reduced equipment size, solve well the problem of the aspects such as radiating mode.
The technical solution of the utility model is achieved in that
A kind of low-voltage ground resistor box, comprises cabinet, and described cabinet is provided with louvre ventilation mouth, and described cabinet front is provided with cabinet door; The bottom surface of described cabinet is provided with support, and described support top is provided with earth resistance; The top of described cabinet door is provided with the voltmeter case of accommodating the controller case of controller and electric elements and accommodating voltmeter; The below of described cabinet door is provided with terminal connections case; The resistor disc place of described earth resistance is provided with temperature sensor.
Further, described earth resistance comprises several grid resistance stacking up and down, between adjacent grid resistance, is provided with insulator.
Further, described temperature sensor is infrared temperature sensor, and described temperature sensor is connected by wireless signal transceiver with described controller.
Further, described cabinet is provided with the bolt hole for fixing cabinet, and described cabinet is realized fixing and ground connection by the bolt through described bolt hole.
Further, the top of described cabinet is provided with the hole for hoist for lifting carrying.
Further, described earth resistance is ferrum-chromium-aluminum titanium alloy resistance.
Further, described cabinet comprises steel-frame structure and shell, and described shell is stainless steel casing or cold-rolled steel sheet plastic jetting shell.
The beneficial effects of the utility model are:
The utility model is simple in structure, easy to use.Have rational radiator structure, each device is setting up and down in cabinet, unaffected and more save space each other; Controller case, voltmeter case and terminal connections case and earth resistance are provided with certain distance, reduce the impact that is subject to resistance temperature; Resistive element adopts lattice structure, has best cooling air flow passage, has avoided localized hyperthermia's point and the easily appearance of calcination point; Line unification between electric elements, controller etc. is via terminal connections case, and it is convenient to install, measure; Temperature sensor is connected by wireless signal transceiver with controller, reduces interconnector, and the installation site of temperature sensor is unrestricted; The utility model can monitoring grounding resistance temperature conditions, when excess Temperature, can find in time.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the Facad structure schematic diagram of an embodiment of the present utility model;
Fig. 2 is that the A of Fig. 1 is to inner structural representation;
Fig. 3 is theory structure schematic diagram of the present utility model;
Fig. 4 is that the terminal of an embodiment of the utility model goes out line chart;
Fig. 5 is the electric bell wiring schematic diagram of an embodiment of the utility model;
Fig. 6 is the voltage relay wiring schematic diagram of an embodiment of the utility model;
Fig. 7 is the voltmeter wiring schematic diagram of an embodiment of the utility model;
Fig. 8 is the miniature circuit breaker wiring schematic diagram of an embodiment of the utility model;
Fig. 9 is the earth resistance wiring schematic diagram of an embodiment of the utility model;
Figure 10 is the controller wiring schematic diagram of an embodiment of the utility model.
In figure:
101, cabinet; 102, cabinet door; 103, controller case; 104, voltmeter case; 105, terminal connections case; 106, louvre ventilation mouth; 107, hole for hoist; 108, grid resistance; 109, insulator; 110, support; 111, current transformer.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
As Figure 1-3, the low-voltage ground resistor box in the present embodiment, comprises cabinet 101, and cabinet 101 is provided with louvre ventilation mouth 106, and cabinet 101 fronts are provided with cabinet door 102; The bottom surface of cabinet 101 is provided with support 110, and support 110 tops are provided with earth resistance; The top of cabinet door 102 is provided with the controller case 103 of accommodating controller and electric elements and the voltmeter case 104 of accommodating voltmeter; The below of cabinet door 102 is provided with terminal connections case 105; The resistor disc place of earth resistance is provided with temperature sensor; The line of earth resistance and step down side neutral point is provided with current transformer 111, and earth resistance two ends are parallel with voltmeter and voltage relay, and voltage relay is connected with warning electric bell.
Earth resistance comprises several grid resistance 108 stacking up and down, is provided with insulator 109 between adjacent grid resistance 108.In the present embodiment, earth resistance is ferrum-chromium-aluminum titanium alloy resistance.
Temperature sensor is infrared temperature sensor, and temperature sensor is connected by wireless signal transceiver with controller.
In the present embodiment, the bottom surface of cabinet 101 is square, and four pin of cabinet 101 are provided with the bolt hole for fixing cabinet 101, it in the present embodiment, is the bolt hole of φ 13, cabinet 101 by through bolt hole be bolted to place to use and ground connection, this convenience simple in structure, can reduce the volume of cabinet 101.The top of cabinet 101 is provided with the hole for hoist 107 for lifting carrying.
Cabinet 101 comprises steel-frame structure and shell, and the present embodiment housing is stainless steel casing, can also adopt cold-rolled steel sheet plastic jetting shell.
As shown in Fig. 4-10, be the wiring situation of the present embodiment, wherein, KK: miniature circuit breaker, CT: current transformer, SH: controller, DL: electric bell, X: terminal, V: voltmeter, YJ: voltage relay, R: resistance.Wherein, in Fig. 4, the arrow at X5 place represents the access of neutral point lead-in wire.
Voltmeter is positioned at voltmeter case 104, and other electric elements are positioned at controller case 103, setting up and down with earth resistance, by the unified wiring of terminal connections case 105, unaffected and more save space each other; Controller case 103, voltmeter case 104 and terminal connections case 105 are provided with certain distance with earth resistance, reduce the impact that is subject to resistance temperature; Resistive element adopts lattice structure, has best cooling air flow passage, has avoided localized hyperthermia's point and the easily appearance of calcination point; Temperature sensor is connected by wireless signal transceiver with controller, reduces interconnector, and the installation site of temperature sensor is unrestricted; The utility model can monitoring grounding resistance temperature conditions, when excess Temperature, can find in time, thereby can adopt less cabinet 101 structures.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.

Claims (7)

1. a low-voltage ground resistor box, comprises cabinet, it is characterized in that: described cabinet is provided with louvre ventilation mouth, and described cabinet front is provided with cabinet door; The bottom surface of described cabinet is provided with support, and described support top is provided with earth resistance; The top of described cabinet door is provided with the voltmeter case of accommodating the controller case of controller and electric elements and accommodating voltmeter; The below of described cabinet door is provided with terminal connections case; The resistor disc place of described earth resistance is provided with temperature sensor.
2. a kind of low-voltage ground resistor box as claimed in claim 1, is characterized in that: described earth resistance comprises several grid resistance stacking up and down, between adjacent grid resistance, is provided with insulator.
3. a kind of low-voltage ground resistor box as claimed in claim 2, is characterized in that: described temperature sensor is infrared temperature sensor, described temperature sensor is connected by wireless signal transceiver with described controller.
4. a kind of low-voltage ground resistor box as claimed in claim 3, is characterized in that: described cabinet is provided with the bolt hole for fixing cabinet, and described cabinet is realized fixing and ground connection by the bolt through described bolt hole.
5. a kind of low-voltage ground resistor box as claimed in claim 4, is characterized in that: the top of described cabinet is provided with the hole for hoist for lifting carrying.
6. a kind of low-voltage ground resistor box as claimed in claim 5, is characterized in that: described earth resistance is ferrum-chromium-aluminum titanium alloy resistance.
7. a kind of low-voltage ground resistor box as claimed in claim 6, is characterized in that: described cabinet comprises steel-frame structure and shell, and described shell is stainless steel casing or cold-rolled steel sheet plastic jetting shell.
CN201420072898.9U 2014-02-19 2014-02-19 Low-voltage grounding resistor cabinet Expired - Fee Related CN203747254U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420072898.9U CN203747254U (en) 2014-02-19 2014-02-19 Low-voltage grounding resistor cabinet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420072898.9U CN203747254U (en) 2014-02-19 2014-02-19 Low-voltage grounding resistor cabinet

Publications (1)

Publication Number Publication Date
CN203747254U true CN203747254U (en) 2014-07-30

Family

ID=51347013

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201420072898.9U Expired - Fee Related CN203747254U (en) 2014-02-19 2014-02-19 Low-voltage grounding resistor cabinet

Country Status (1)

Country Link
CN (1) CN203747254U (en)

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
PE01 Entry into force of the registration of the contract for pledge of patent right

Denomination of utility model: Low-voltage grounding resistor cabinet

Effective date of registration: 20160802

Granted publication date: 20140730

Pledgee: Qingdao Huitong Chinese financing Company limited by guarantee

Pledgor: QINGDAO SHICHI ELECTRIC CO., LTD.

Registration number: 2016990000668

PLDC Enforcement, change and cancellation of contracts on pledge of patent right or utility model
PC01 Cancellation of the registration of the contract for pledge of patent right
PC01 Cancellation of the registration of the contract for pledge of patent right

Date of cancellation: 20170623

Granted publication date: 20140730

Pledgee: Qingdao Huitong Chinese financing Company limited by guarantee

Pledgor: QINGDAO SHICHI ELECTRIC CO., LTD.

Registration number: 2016990000668

CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20140730

Termination date: 20210219