CN215378435U - Direct-current bus protection system of urban rail transit traction substation - Google Patents
Direct-current bus protection system of urban rail transit traction substation Download PDFInfo
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- CN215378435U CN215378435U CN202121026075.9U CN202121026075U CN215378435U CN 215378435 U CN215378435 U CN 215378435U CN 202121026075 U CN202121026075 U CN 202121026075U CN 215378435 U CN215378435 U CN 215378435U
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Abstract
The utility model provides a direct-current bus protection system of an urban rail transit traction substation, which comprises a bus protection device, an incoming line current sensor and a feeder line current sensor, wherein the input end of the bus protection device is connected with the incoming line current sensor and the feeder line current sensor, the incoming line current sensor is arranged on an incoming line of a direct-current bus, the feeder line current sensor is arranged on a feeder line of the direct-current bus, and the output end of the bus protection device is respectively connected with switches on the incoming line and the feeder line of the direct-current bus. The utility model can process the conditions of direct current bus short circuit, rectifier outlet short circuit and feeder outlet short circuit in time, accurately and rapidly remove the fault area, possibly reduce the power failure range and ensure that the non-fault area can normally supply power.
Description
Technical Field
The utility model belongs to the field of rail transit, and particularly relates to a direct-current bus protection system of an urban rail transit traction substation.
Background
The urban rail transit traction substation has the function that a power supply of a medium-voltage alternating-current ring network obtains direct current through rectification to supply power to a locomotive. The traction substation comprises two paths of medium-voltage alternating-current power supplies, two sets of 12-pulse rectifier units, two direct-current incoming line circuit breakers and four feeder line circuit breakers. Wherein, two sets of rectifier units are connected in parallel to form equivalent 24 pulses. The traction substation supplies direct current to a traction network, and the traction network consists of a contact network (or a contact rail) and a steel rail. And the traction substation and the traction network jointly form a traction power supply system. And the positive line contact network of the adjacent traction substation of the positive line supplies power bilaterally.
The most dangerous faults of the direct current traction power supply system in operation are various short-circuit faults, and the relay protection device has the task of finding and removing the faults. The relay protection needs to meet the requirements of reliability, sensitivity, speed and selectivity. In order to avoid influencing the traveling, when a short-circuit fault occurs in a direct-current traction power supply system, the power failure range is reduced as much as possible, so that a non-fault area can normally supply power, and the selectivity of relay protection is more and more important. When a direct current system is short-circuited, the short-circuit current is very large, particularly the near end short-circuit, the short-circuit current often reaches dozens of kiloamperes, at this time, a protection device needs to act quickly, so that the breaker cuts off the short-circuit current in a short time, and the requirement on the speed of the protection device is also very high. The protection device has contradiction between quick action and selectivity.
Disclosure of Invention
Aiming at the technical problems in the prior art, the utility model provides a direct-current bus protection system for an urban rail transit traction substation, which can timely and accurately process various short-circuit faults of a direct-current bus of the traction substation and quickly remove a fault area.
The technical scheme adopted by the utility model is as follows: the utility model provides an urban rail transit pulls electric substation direct current generating line protection system, includes generating line protection device, inlet wire current sensor and feeder current sensor, generating line protection device's input is connected with inlet wire current sensor, feeder current sensor, inlet wire current sensor sets up in the inlet wire of direct current generating line, feeder current sensor sets up in the feeder of direct current generating line, generating line protection device's output is connected with the switch on the inlet wire of direct current generating line, the feeder respectively.
Furthermore, the number of the incoming line current sensors is two, and the number of the feeder line current sensors is four.
Further, the bus protection device comprises an input module, an AD conversion module, a processing module, a storage module and an output module, wherein the input module is connected with the AD conversion module, and the processing module is respectively connected with the AD conversion module, the storage module and the output module.
Furthermore, the processing module is also connected with the power module, the Ethernet module, the panel indicator light and the LCD.
Further, the switch on the incoming line is a one-way large-current release.
Further, the switch on the feeder line is a bidirectional large-current release.
Compared with the prior art, the utility model has the beneficial effects that: the utility model can process the conditions of direct current bus short circuit, rectifier outlet short circuit and feeder outlet short circuit in time, accurately and rapidly remove the fault area, possibly reduce the power failure range and ensure that the non-fault area can normally supply power.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a bus bar protection device according to an embodiment of the present invention.
In the figure, 1 is an input module, 2 is an AD conversion module, 3 is a processing module, 4 is a storage module, 5 is a power supply module, 6 is an Ethernet module, 7 is a panel indicator light and 8 is an output module.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The embodiment of the utility model provides a direct-current bus protection system of an urban rail transit traction substation, which comprises a bus protection device ZMCD, an incoming line current sensor and a feeder line current sensor, wherein the input end of the bus protection device ZMCD is connected with the incoming line current sensor and the feeder line current sensor. The number of the incoming line current sensors is two, and the incoming line current sensors are respectively a 1# incoming line current sensor CTK1 and a 2# incoming line current sensor CTK2 which are respectively arranged on two incoming lines of the direct current bus. The number of the feeder line current sensors is four, the feeder line current sensors are respectively a 1# feeder line current sensor CTF1, a 2# feeder line current sensor CTF2, a 3# feeder line current sensor CTF3 and a 4# feeder line current sensor CTF4, and the feeder line current sensors are respectively arranged on four feeder lines of the direct current bus. And the output end of the bus protection device ZMCD is respectively connected with the incoming line of the direct current bus and the switch on the feeder line. The switches on the two incoming lines are respectively a 1# unidirectional large-current release K1 and a 2# unidirectional large-current release K2. The switches on the four feeder lines are respectively a 1# bidirectional large-current release F1, a 2# bidirectional large-current release F2, a 3# bidirectional large-current release F3 and a 4# bidirectional large-current release F4.
Bus bar protection device ZMCD includes input module 1, AD conversion module 2, processing module 3, storage module 4, power module 5, ethernet module 6, panel pilot lamp 7 and output module 8, input module 1 is connected with AD conversion module 2, processing module 3 is connected with AD conversion module 2, storage module 4, power module 5, ethernet module 6, panel pilot lamp 7, LCD and output module 8 respectively. The input module 1 is connected with a 1# incoming line current sensor CTK1, a 2# incoming line current sensor CTK2, a 1# feeder current sensor CTF1, a 2# feeder current sensor CTF2, a 3# feeder current sensor CTF3 and a 4# feeder current sensor CTF 4; the output module 8 is connected with a # 1 unidirectional large-current release K1, a # 2 unidirectional large-current release K2, a # 1 bidirectional large-current release F1, a # 2 bidirectional large-current release F2, a # 3 bidirectional large-current release F3 and a # 4 bidirectional large-current release F4.
The bus protection device ZMCD collects six currents, and specifies the current direction: the current pointing to the bus is a positive value; the current flowing out of the bus bar is negative. Setting a difference value of six currents as a differential current Icd, and when the differential current is greater than a differential current fixed value Iset (preset), performing bus protection action, wherein an expression is as follows: icd > Iset. In normal operation, the current flowing into the bus is equal to the current flowing out of the bus, Icd is 0, and the bus protection is not operated.
Analyzing the action condition of the direct current short circuit protection:
(1)2# rectifier outlet short circuit
The current flowing into the bus is equal to the current flowing out of the bus, Icd is 0, and the bus protection is not operated. The 1# unidirectional high-current release K1 of the 1# incoming line is unidirectional and does not act. The 2# unidirectional large-current release K2 of the 2# incoming line trips, the 2# rectifier unit exits, the 1# rectifier unit normally operates, and the power failure range is not expanded.
(2) Short circuit of DC bus
The current flows into the bus, Icd is larger than Iset, the bus protection acts, the bus protection simultaneously trips six switches (a 1# one-way large-current release K1, a 2# one-way large-current release K2, a 1# two-way large-current release F1, a 2# two-way large-current release F2, a 3# two-way large-current release F3 and a 4# two-way large-current release F4), and the quick action of the feeder line is improved.
(3)4# feeder outlet short circuit
The current flowing into the bus is equal to the current flowing out of the bus, Icd is 0, and the bus protection is not operated. The 1# unidirectional large-current release K1 and the 2# unidirectional large-current release K2 of the incoming line are unidirectional and do not act. The 4# bidirectional large-current tripper F4 of the 4# feeder line trips, the temporary feeder line is jumped in a connecting mode, other contact networks run normally, and the power failure range is not enlarged.
The present invention has been described in detail with reference to the embodiments, but the description is only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The scope of the utility model is defined by the claims. The technical solutions of the present invention or those skilled in the art, based on the teaching of the technical solutions of the present invention, should be considered to be within the scope of the present invention, and all equivalent changes and modifications made within the scope of the present invention or equivalent technical solutions designed to achieve the above technical effects are also within the scope of the present invention.
Claims (6)
1. The utility model provides an urban rail transit pulls electric substation direct current generating line protection system which characterized in that: the bus protection device comprises a bus protection device, an incoming line current sensor and a feeder line current sensor, wherein the input end of the bus protection device is connected with the incoming line current sensor and the feeder line current sensor, the incoming line current sensor is arranged on an incoming line of a direct current bus, the feeder line current sensor is arranged on a feeder line of the direct current bus, and the output end of the bus protection device is respectively connected with the incoming line of the direct current bus and a switch on the feeder line.
2. The urban rail transit traction substation direct current bus protection system of claim 1, characterized in that: the number of the incoming line current sensors is two, and the number of the feeder line current sensors is four.
3. The urban rail transit traction substation direct current bus protection system of claim 1, characterized in that: the bus protection device comprises an input module, an AD conversion module, a processing module, a storage module and an output module, wherein the input module is connected with the AD conversion module, and the processing module is respectively connected with the AD conversion module, the storage module and the output module.
4. The urban rail transit traction substation direct current bus protection system of claim 3, characterized in that: the processing module is also connected with the power module, the Ethernet module and the LCD.
5. The urban rail transit traction substation direct current bus protection system of claim 1, characterized in that: the switch on the incoming line is a one-way large-current release.
6. The urban rail transit traction substation direct current bus protection system of claim 1, characterized in that: the switch on the feeder line is a bidirectional large-current release.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121026075.9U CN215378435U (en) | 2021-05-13 | 2021-05-13 | Direct-current bus protection system of urban rail transit traction substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121026075.9U CN215378435U (en) | 2021-05-13 | 2021-05-13 | Direct-current bus protection system of urban rail transit traction substation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215378435U true CN215378435U (en) | 2021-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121026075.9U Active CN215378435U (en) | 2021-05-13 | 2021-05-13 | Direct-current bus protection system of urban rail transit traction substation |
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| Country | Link |
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| CN (1) | CN215378435U (en) |
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2021
- 2021-05-13 CN CN202121026075.9U patent/CN215378435U/en active Active
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