CN203707756U - Electric leakage protection device for direct-current power supply of streetcar - Google Patents
Electric leakage protection device for direct-current power supply of streetcar Download PDFInfo
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- CN203707756U CN203707756U CN201420112968.9U CN201420112968U CN203707756U CN 203707756 U CN203707756 U CN 203707756U CN 201420112968 U CN201420112968 U CN 201420112968U CN 203707756 U CN203707756 U CN 203707756U
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- power supply
- resistance
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- controller
- electric leakage
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Abstract
The utility model discloses an electric leakage protection device for a direct-current power supply of a streetcar. The electric leakage protection device comprises the direct-current power supply, a neutral-point earthing electric leakage detection circuit, a circuit breaker K1, a controller and a displayer, wherein the direct-current power supply is converted from an alternating-current power supply by a full-bridge rectification filter circuit D1 consisting of an isolation transformer T1 and a one-way conduction thyristor, and the direct-current power supply adopts load power supply; an input end of the neutral-point earthing electric leakage detection circuit is connected with the direct-current power supply through the circuit breaker K1, and an output end is connected with the controller; and an output end of the controller is connected with the full-bridge rectification filter circuit D1, the circuit breaker K1 and the displayer respectively. According to the electric leakage protection device for the direct-current power supply of the streetcar, the neutral-point earthing electric leakage detection circuit can detect the electric leakage condition of a power supply system accurately and timely, the direct-current power supply is cut off by the controller, and equipment damage or personal injury due to electric leakage in a streetcar running process are prevented; and parameters are set as required to define a maximum electric leakage value of the system, and the safety performance is further improved.
Description
Technical field
The utility model relates to earth leakage protective device field, is specifically related to the earth leakage protective device of tramcar DC power supply.
Background technology
Common earth leakage protective device; for touch/earth leakage protective device of electric current action type; claim again difference current action protector or earth fault protection device etc.; be mainly used in the earth leakage protective of AC network; its operation principle as shown in Figure 3, is passed magnet ring when the live wire L of single phase poaer supply and zero line N, and zero line N ground connection; E is the induced electromotive force producing in magnetic ring coil, Z
xfor live wire L ohmic leakage, while electric leakage, electric current enters load from live wire L through magnet ring, is more oppositely back to power end through after magnet ring through zero line N, and the sum of elect ric currents of the magnet ring of flowing through is zero, does not produce induced electromotive force in magnetic ring coil; In the time of live wire L Leaked Current of Line to Ground, leakage current arrives power end by line residual current, and without magnet ring, the sum of elect ric currents of magnet ring of flowing through is like this non-vanishing, in magnetic ring coil, produce induced electromotive force E, can be calculated the leakage current value of circuit by E, and then calculate the Leaked Current of Line to Ground resistance Z of circuit
xthe method is easy to realize, measuring speed is fast, but requiring must have one end ground connection in power circuit, if live wire L, zero line N are earth-free, just cannot form effective leakage current loop, and then cannot measure the leakage current of power supply, therefore, the insulated supply system of non-grounded type can not be measured leakage current with said method.
Every group of train of tramcar is made up of 3 to 6 joint compartments, and there is minimum leakage requirement over the ground in every joint compartment; The power supply that tramcar uses is 750V DC power supply; it is a kind of insulated supply system of non-grounded type; due to field condition complexity; compartment electric leakage situation happens occasionally; therefore require the 750V DC power supply using to there is creepage protection function; avoid the device damage or the personal injury that in tramcar running, cause because of electric leakage, common earth leakage protective device cannot be realized this function to DC power supply.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of earth leakage protective device of tramcar DC power supply; can solve existing earth leakage protective device requirement power circuit one end ground connection; cannot realize creepage protection function to DC power supply, cannot provide safety guarantee to passenger and the equipment of the tramcar that adopts 750V DC power supply.
The utility model is achieved through the following technical solutions:
The earth leakage protective device of tramcar DC power supply; comprise the DC power supply being converted to from AC power by the full-bridge rectification filter circuit D1 of isolating transformer T1 and one-way conduction thyristor composition; described DC power supply is load supplying; also comprise neutral ground electric-leakage detection circuit, circuit breaker K1, controller and display; the input of described neutral ground electric-leakage detection circuit connects DC power supply through circuit breaker K1; output connects controller, and the output of described controller connects respectively full-bridge rectification filter circuit D1, circuit breaker K1 and display.
Described neutral ground electric-leakage detection circuit is made up of resistance R 1, resistance R 2, resistance R 3 and voltage sensor U1 and voltage sensor U2, described resistance R 1 and resistance R 2 are series between DC power supply positive and negative electrode through circuit breaker K1, described resistance R 3 one end are connected in the common port of resistance R 1 and resistance R 2, other end ground connection; The input anode of described voltage sensor U1 connects DC power anode, input cathode ground connection, and output connects controller by analog to digital converter AD1; The input anode of described voltage sensor U2 connects DC power anode, and input cathode connects DC power cathode, and output connects controller by analog to digital converter AD2.
Described circuit breaker K1 is the relay that coil terminals connects controller output end, and resistance R 1 connects DC power anode through the normally opened contact K1-1 of relay, and resistance R 2 connects DC power cathode through the normally opened contact K1-2 of relay.
Described controller is PLC programmable logic controller (PLC).
The utility model has the advantage of:
The electric leakage situation of the detection electric power system that, neutral ground electric-leakage detection circuit can be accurately and timely, controller cuts off DC power supply, avoids the device damage or the personal injury that in tramcar running, cause because of electric leakage;
Two, and set as required the resistance of resistance R 1, resistance R 2, resistance R 3, maximum electrical leakage that can restriction system, thus further improve fail safe.
Accompanying drawing explanation
Fig. 1 is mounting structure schematic diagram of the present utility model.
Fig. 2 is schematic diagram of the present utility model.
Fig. 3 is the schematic diagram of existing earth leakage protective device.
Embodiment
The earth leakage protective device of tramcar DC power supply as shown in Figure 1, comprise the DC power supply being converted to from AC power by the full-bridge rectification filter circuit D1 of isolating transformer T1 and one-way conduction thyristor composition, described DC power supply is load supplying, also comprise neutral ground electric-leakage detection circuit, circuit breaker K1, as PLC programmable logic controller (PLC) and the display of controller, described circuit breaker K1 is the relay that coil terminals connects PLC programmable logic controller (PLC) output, described neutral ground electric-leakage detection circuit is by resistance R 1, resistance R 2, resistance R 3 and voltage sensor U1 and voltage sensor U2 composition, described resistance R 1 and resistance R 2 are just being series at DC power supply, between negative pole, resistance R 1 connects DC power anode through the normally opened contact K1-1 of relay, resistance R 2 connects DC power cathode through the normally opened contact K1-2 of relay, described resistance R 3 one end are connected in the common port of resistance R 1 and resistance R 2, other end ground connection, the input anode of described voltage sensor U1 connects DC power anode, input cathode ground connection, and output connects PLC programmable logic controller (PLC) by analog to digital converter AD1, the input anode of described voltage sensor U2 connects DC power anode, input cathode connects DC power cathode, output connects PLC programmable logic controller (PLC) by analog to digital converter AD2, and the output of described PLC programmable logic controller (PLC) connects respectively full-bridge rectification filter circuit D1, circuit breaker K1 and display.
The principle of neutral ground electric-leakage detection circuit as shown in Figure 2, can be able to lower equation according to Thevenin's theorem:
U
1=I
1*R
1+(I
X+I
1)*R
2 (1)
I
1*R
1=U
2+I
X*R
3 (2)
Separate above-mentioned equation group and can obtain leakage current I
x:
I
X=(U
1*R
1-U
2*R
1-U*R
2)/(R
1*R
2+R
2*R
3+R
1*R
3) (3)
Calculate for simplifying, in the actual use of engineering, make R
1=R
2=R, can obtain:
I
X=(U
1-2U
2)/(R+2R
3) (4)
If the I in above formula
xfor on the occasion of, represent anodal Leaked Current of Line to Ground value; If I
xfor negative value, represent negative pole Leaked Current of Line to Ground value.
By formula (4), known in conjunction with Fig. 2:
|U
1-2U
2|≤U
1 (5)
The reasonably denominator of allocation formula (4), i.e. resistance R, resistance R
3resistance, maximum leakage current that can restriction system, avoids the system harm causing of leaking electricity.
In conjunction with formula (4) and formula (5), can obtain the electrical leakage I of system maximum
x_MAX:
I
X_MAX=U
1/(R+2R
3) (6)
In the application of DC power supply, electric shock accidents occurs causes the direct current of human body ventricular fibrillation to be about 300mA (or can be described as direct current let-go current threshold values), so the maximum electrical leakage of system is less than 300mA, can obtain according to formula (6):
750/ (R+2R
3) < 0.3 (is R+2R
3> 2500 Ω) (7)
Choosing R (is resistance R
1, resistance R
2) be 800 Ω, R
3be 1000 Ω, and substitution formula (4) can obtain the electric leakage computing formula of system:
I
X=(U
1-2U
2)/(R+2R
3)=(U
1-2U
2)/2800 (8)
Magnitude of voltage U1, magnitude of voltage U2 that PLC programmable logic controller (PLC) detects according to voltage sensor U1 and voltage sensor U2, calculate and obtain I
xthereby, judge whether to exist electric leakage, in the time of electric leakage, cut off DC power supply by full-bridge rectification filter circuit D1, simultaneously according to I
xpositive and negative value judgement electric leakage circuit, and on display, send warning.
Claims (4)
1. the earth leakage protective device of tramcar DC power supply, comprise the DC power supply being converted to from AC power by the full-bridge rectification filter circuit D1 of isolating transformer T1 and one-way conduction thyristor composition, described DC power supply is load supplying, it is characterized in that: also comprise neutral ground electric-leakage detection circuit, circuit breaker K1, controller and display, the input of described neutral ground electric-leakage detection circuit connects DC power supply through circuit breaker K1, output connects controller, the output of described controller connects respectively full-bridge rectification filter circuit D1, circuit breaker K1 and display.
2. the earth leakage protective device of tramcar DC power supply as claimed in claim 1, it is characterized in that: described neutral ground electric-leakage detection circuit is made up of resistance R 1, resistance R 2, resistance R 3 and voltage sensor U1 and voltage sensor U2, described resistance R 1 and resistance R 2 are series between DC power supply positive and negative electrode through circuit breaker K1, described resistance R 3 one end are connected in the common port of resistance R 1 and resistance R 2, other end ground connection; The input anode of described voltage sensor U1 connects DC power anode, input cathode ground connection, and output connects controller by analog to digital converter AD1; The input anode of described voltage sensor U2 connects DC power anode, and input cathode connects DC power cathode, and output connects controller by analog to digital converter AD2.
3. the earth leakage protective device of tramcar DC power supply as claimed in claim 2; it is characterized in that: described circuit breaker K1 is the relay that coil terminals connects controller output end; resistance R 1 connects DC power anode through the normally opened contact K1-1 of relay, and resistance R 2 connects DC power cathode through the normally opened contact K1-2 of relay.
4. the earth leakage protective device of the tramcar DC power supply as described in claim 1 or 2 or 3, is characterized in that: described controller is PLC programmable logic controller (PLC).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420112968.9U CN203707756U (en) | 2014-03-13 | 2014-03-13 | Electric leakage protection device for direct-current power supply of streetcar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420112968.9U CN203707756U (en) | 2014-03-13 | 2014-03-13 | Electric leakage protection device for direct-current power supply of streetcar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203707756U true CN203707756U (en) | 2014-07-09 |
Family
ID=51058138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420112968.9U Expired - Fee Related CN203707756U (en) | 2014-03-13 | 2014-03-13 | Electric leakage protection device for direct-current power supply of streetcar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203707756U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135061A (en) * | 2014-07-15 | 2014-11-05 | 沈亚斌 | Direct current supply system with leakage protection |
| CN109245026A (en) * | 2017-07-10 | 2019-01-18 | 比亚迪股份有限公司 | Train, power supply system of train and its earth leakage protective device |
-
2014
- 2014-03-13 CN CN201420112968.9U patent/CN203707756U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135061A (en) * | 2014-07-15 | 2014-11-05 | 沈亚斌 | Direct current supply system with leakage protection |
| CN104135061B (en) * | 2014-07-15 | 2016-07-06 | 沈亚斌 | The earth leakage protective DC power-supply system of a kind of band |
| CN109245026A (en) * | 2017-07-10 | 2019-01-18 | 比亚迪股份有限公司 | Train, power supply system of train and its earth leakage protective device |
| CN109245026B (en) * | 2017-07-10 | 2020-02-04 | 比亚迪股份有限公司 | Train, train power supply system and earth leakage protection device thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: XUE FENG Free format text: FORMER OWNER: JIANGSU ZHONGLIANG TECHNOLOGY CO., LTD. Effective date: 20150416 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20150416 Address after: 223600 No. 8, Ruian Road, Shuyang Economic Development Zone, Suqian, Jiangsu Patentee after: Xue Feng Address before: 223600 No. 3, Ruian Road, Shuyang County, Suqian, Jiangsu Patentee before: Jiangsu Zhongliang Technology Co.,Ltd. |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160310 Address after: 100037 Beijing City, Fengtai District Fangzhuang Star Park two District 13 Building Room 1257 No. 2 Platform Patentee after: The Beijing rail Klc Holdings Ltd in Hong Kong Address before: 223600 No. 8, Ruian Road, Shuyang Economic Development Zone, Suqian, Jiangsu Patentee before: Xue Feng |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160323 Address after: 100037, room 23, building 1, building 72, building 1061, Qinghe Third Street, Haidian District, Beijing Patentee after: China new energy rail transportation equipment Co., Ltd. Address before: 100037 Beijing City, Fengtai District Fangzhuang Star Park two District 13 Building Room 1257 No. 2 Platform Patentee before: The Beijing rail Klc Holdings Ltd in Hong Kong |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140709 Termination date: 20210313 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |