CN108173338B - Device for automatically switching bus voltage in railway traction station - Google Patents

Device for automatically switching bus voltage in railway traction station Download PDF

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Publication number
CN108173338B
CN108173338B CN201611115839.5A CN201611115839A CN108173338B CN 108173338 B CN108173338 B CN 108173338B CN 201611115839 A CN201611115839 A CN 201611115839A CN 108173338 B CN108173338 B CN 108173338B
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voltage
relay
normally open
open contact
output
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CN108173338A (en
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高宇膺
洪丽强
王海峰
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NR Electric Co Ltd
NR Engineering Co Ltd
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NR Electric Co Ltd
NR Engineering Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/02Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which an auxiliary distribution system and its associated lamps are brought into service

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  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

The invention discloses a device for automatically switching bus voltage in a railway traction station, which comprises a no-voltage relay J1, an overvoltage relay J2, a no-voltage relay J3 and an overvoltage relay J4: the output pin of J1 includes a normally open contact A0, the output pin of J2 includes a normally open contact B0, the normally open contact A0 is connected with the reset pin of the hold relay KJ1, the normally open contact B0 is connected with the start pin of KJ1, and the output pin of KJ1 includes a normally open contact E0 and a normally closed contact E1; the output pin of J3 includes a normally open contact C0, the output pin of J4 includes a normally open contact D0, C0 is connected with the reset pin of holding relay KJ2 and D0 is connected with the start pin of KJ2, and the output pin of KJ2 includes a normally open contact F0 and a normally closed contact F1; e0 is connected with F1 in series and then connected with F0 in parallel to be used as a PT-B master; f0 is connected with E1 in series and then connected with E0 in parallel to be used as a PT-A master; the PT-A main circuit and the PT-B main circuit are switched and output voltage through the change-over switch respectively. Switching malfunction can be effectively avoided.

Description

Device for automatically switching bus voltage in railway traction station
Technical Field
The invention relates to a device for automatically switching bus voltage in a railway traction station.
Background
At present, a traction substation of an electrified railway adopts a dual redundant hot standby mode, 2 voltage transformers (set as PT-A and PT-B) are arranged on a low-voltage 27.5kV bus, and the bus voltage output by the secondary side of the voltage transformers is switched and then sent to secondary equipment such as protection measurement and control and the like so as to realize a protection control function. The existing bus voltage switching adopts manual switching and automatic switching realized by not maintaining a contact.
The manual switching scheme is as shown in fig. 1, switching of output voltage between PT-a and PT-B is realized by manually operating a change-over switch, but the real-time performance of manual switching is poor, and when 1 voltage transformer fails or loses voltage, switching cannot be completed in time, so that voltage loss of a bus of secondary equipment such as protection measurement and control can be caused, and the safe operation of the equipment is affected.
The scheme for automatically switching the non-holding contact is shown in fig. 2, the secondary voltage output by the PT-A is monitored through a voltage loss relay, when the PT-A is in normal operation, the voltage loss relay does not act, the X0 contact is opened, the X1 contact is closed, and the output voltage is the PT-A secondary voltage; when PT-A is in voltage loss, the voltage loss relay acts, the X0 contact is closed, the X1 contact is opened, and the output voltage is switched to the secondary voltage of PT-B. However, the scheme realizes automatic switching by not maintaining the contacts X0 and X1, when a voltage-loss relay is in fault or an auxiliary power supply disappears, the contacts X0 and X1 return to an initial state, the output voltage is switched to PT-B by the switching loop, and if the PT-B is in a fault maintenance state, the voltage loss of a secondary loop is caused, and the safe operation of equipment is influenced. In addition, the scheme can not realize the fl mutexible main and standby switching function of the PT-A and the PT-B, and brings inconvenience to operation and maintenance.
Chinese patent No. 200620166601.0 discloses a substation automatic switching device, which can realize unattended operation of a substation, and uses a common intermediate relay (not held), but the start-up loop is a self-holding loop, and when the auxiliary power supply disappears or the relay itself fails, switching malfunction is caused, which brings inconvenience to operation and maintenance.
Disclosure of Invention
In order to solve the problems, the invention provides a device for automatically switching bus voltage in a railway traction station, which can avoid switching misoperation under the conditions of relay failure or disappearance of an auxiliary power supply and the like, and simultaneously realize fl mutexible switching of a main transformer PT-A and a voltage transformer PT-B for standby.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
the utility model provides a device of automatic switch-over busbar voltage in railway traction office which characterized in that, includes parallelly connected no-voltage relay J1 and overvoltage relay J2 at the output of voltage transformer PT-A respectively to and parallelly connected no-voltage relay J3 and overvoltage relay J4 at the output of voltage transformer PT-B respectively, wherein:
the output pin of the voltage-losing relay J1 comprises a normally open contact A0, the output pin of the overvoltage relay J2 comprises a normally open contact B0, the normally open contact A0 is connected with a reset pin of a holding relay KJ1, the normally open contact B0 is connected with a starting pin of a holding relay KJ1, and the output pin of the holding relay KJ1 comprises a normally open contact E0 and a normally closed contact E1;
the output pin of the voltage-losing relay J3 comprises a normally open contact C0, the output pin of the overvoltage relay J4 comprises a normally open contact D0, the normally open contact C0 is connected with a reset pin of a holding relay KJ2, the normally open contact D0 is connected with a starting pin of a holding relay KJ2, and the output pin of the holding relay KJ2 comprises a normally open contact F0 and a normally closed contact F1;
the normally open contact E0 is connected in series with the normally closed contact F1 and then connected in parallel with the normally open contact F0 to be used as a PT-B main use; the normally open contact F0 is connected in series with the normally closed contact E1 and then connected in parallel with the normally open contact E0 to be used as a PT-A main use; the PT-A main use is switched and voltage output through a change-over switch;
and the PT-B master uses the change-over switch to carry out switching and voltage output.
Preferably, the PT-A master uses and switches and outputs voltage through a manual change-over switch; and the PT-B master uses the other manual change-over switch to carry out switching and voltage output.
Preferably, the model of the voltage loss relay J1 is the same as that of the voltage loss relay J3, and the model of the overvoltage relay J2 is the same as that of the overvoltage relay J4.
Preferably, the hold relays KJ1 and KJ2 are of the same type.
The invention has the beneficial effects that:
the main voltage transformer equipment can be flexibly selected through the change-over switch, operation and maintenance are convenient, the automatic switching function can be realized under the condition that any voltage transformer is failed and loses voltage or an auxiliary power supply disappears, and the switching misoperation is avoided. Meanwhile, because the E0, the E1, the F0 and the F1 are all maintaining contacts, and the starting and resetting contacts of the maintaining relay all adopt normally open contacts, the switching contact malfunction caused by external reasons can be avoided, and the switching function has good stability and reliability.
Drawings
FIG. 1 is a schematic diagram of a manual switching circuit in a prior art design;
FIG. 2 is a schematic diagram of an automatic switching circuit in a prior art design without a maintained contact;
FIG. 3 is a schematic diagram of a loss of voltage relay, over voltage relay monitoring circuit of the present invention;
FIG. 4 is a schematic diagram of a hold-up relay circuit of the present invention;
fig. 5 is a schematic diagram of a voltage switching loop of an automatic bus voltage switching device in a railway traction station.
Detailed Description
The present invention will be better understood and implemented by those skilled in the art by the following detailed description of the technical solution of the present invention with reference to the accompanying drawings and specific examples, which are not intended to limit the present invention.
As shown in fig. 3-5, the traction substation of the electric railway adopts a dual redundant hot standby mode, 2 voltage transformers (set as a voltage transformer PT-a and a voltage transformer PT-B) are arranged on a low-voltage 27.5kV bus, and a device for automatically switching the bus voltage in the railway traction substation comprises a no-voltage relay J1 and an overvoltage relay J2 which are respectively connected in parallel at the output end of the voltage transformer PT-a, and a no-voltage relay J3 and an overvoltage relay J4 which are respectively connected in parallel at the output end of the voltage transformer PT-B.
The output pin of the voltage-losing relay J1 comprises a normally open contact A0, the output pin of the overvoltage relay J2 comprises a normally open contact B0, the normally open contact A0 is connected with a reset pin (namely, a return pin in FIG. 4) of the holding relay KJ1, the normally open contact B0 is connected with a starting pin of the holding relay KJ1, and the output pin of the holding relay KJ1 comprises a normally open contact E0 and a normally closed contact E1. The voltage of a potential transformer PT-A is monitored by a voltage loss relay J1 and an overvoltage relay J2, a joint A0 of the output of the relay is PT-A voltage-free, and a joint B0 is PT-A voltage-free. KJ1 is a holding relay, which adopts A0 contact to reset, B0 contact to start, the output contact E0 is a holding signal with PT-A voltage, and E1 is a holding signal with PT-A voltage.
The output pin of the voltage-losing relay J3 comprises a normally open contact C0, the output pin of the overvoltage relay J4 comprises a normally open contact D0, the normally open contact C0 is connected with a reset pin of the holding relay KJ2, the normally open contact D0 is connected with a starting pin of the holding relay KJ2, and the output pin of the holding relay KJ2 comprises a normally open contact F0 and a normally closed contact F1. The voltage of a potential transformer PT-B is monitored by a voltage loss relay J3 and an overvoltage relay J4, a joint C0 of the output of the relays is PT-B voltage-free, and a joint D0 is PT-B voltage-free. KJ2 is a holding relay, C0 contact is adopted for resetting, D0 contact is started, and output contact F0 is a holding signal with PT-B voltage, and F1 is a holding signal with PT-B voltage.
The normally open contact E0(PT-A pressure maintaining contact) is connected in series with the normally closed contact F1(PT-B non-pressure maintaining contact), and then connected in parallel with the normally open contact F0(PT-B pressure maintaining contact) to be used as the PT-B main use. The normally open contact F0(PT-B pressure maintaining contact) is connected in series with the normally closed contact E1(PT-A pressure maintaining contact), and then connected in parallel with the normally open contact E0(PT-A pressure maintaining contact) to be used as the PT-A main use.
The PT-A main use and the PT-B main use are switched and voltage output through a change-over switch, preferably as shown in FIG. 5, the PT-A main use and the PT-B main use are respectively switched and voltage output through corresponding manual change-over switches, the manual change-over switches are provided with two working positions, namely the PT-A main use and the PT-B main use, and the PT-A main use and the PT-B main use output a switched voltage lap joint loop after passing through the manual change-over switches. The voltage after switching is stable and reliable, is not influenced by the voltage loss or the fault of the switching loop, and can flexibly select the main voltage transformer equipment through the change-over switch.
The normally open holding contact with PT-A pressure and the normally closed holding contact with PT-A pressure are output by the holding relay, and the starting and resetting of the holding relay are normally open contacts. Similarly, a normally open holding contact with PT-B pressure and a normally closed holding contact with PT-B no pressure are output by a holding relay, and the starting and resetting of the holding relay are normally open contacts.
Generally, the types of the voltage loss relays J1 and J3 are the same, for example, RY-D2 of Shanghai Juren electric power technology Co., Ltd, the types of the overvoltage relays J2 and J4 are the same, for example, RY-D1 of Shanghai Juren electric power technology Co., Ltd, and the types of the hold relays KJ1 and KJ2 are the same, for example, ST2-2L of Nanrui relay protection. The voltage of PT-B, PT-A is monitored by an overvoltage relay, and the output normally open contact is a voltage signal. The voltage of PT-B, PT-A is monitored by undervoltage relay, and the output normally open contact is the no-voltage signal.
As shown in fig. 5, the logical relationship analysis is as follows:
point A is the input of a PT-A voltage transformer, point B is the input of a PT-B voltage transformer, points M and N are intermediate switching contacts, and point Q is the switched voltage output;
it is considered that when PT-A, PT-B has all voltage, the switched voltage is output according to the selection of the manual change-over switch; when any transformer loses voltage, the transformer is automatically switched to another transformer; when the two transformers have no voltage, the switching loop has no meaning and is not considered.
Case 1: PT-A, PT-B has all the following pressures:
e0 and F0 are closed, E1 and F1 are opened, then M is A, N is B, and the finally output switched voltage Q depends on the selection of the manual change-over switch, and when the selection is PT-a master, Q is M is a, i.e. the secondary voltage with the output voltage PT-a; when the primary PT-B is selected, Q is equal to N and equal to B, namely the secondary voltage with the output voltage of PT-B. And the flexible switching function of the main and standby voltages is realized.
Case 2: PT-A is decompressed, and PT-B normally operates:
e1 and F0 are closed, E0 and F1 are opened, M is B, N and B, and no matter how the change-over switch is selected, Q is N and B, and the output voltage is the secondary voltage of PT-B in normal operation.
Case 3: normal operation of PT-A, pressure loss of PT-B:
e0 and F1 are closed, E1 and F0 are opened, M is A, N is a, no matter how the change-over switch is selected, Q is N is a, and the output voltage is the secondary voltage of PT-a in normal operation.
The following Chinese patent with patent number 200620166601.0 is compared in detail as follows:
in case of disappearance of the auxiliary power:
the scheme in the chinese patent with patent number 200620166601.0 needs to ensure that the + XM and-XM voltages are normal; if the first group of mutual inductors are in voltage loss, when the voltage is automatically input to the voltage of the second group of mutual inductors through the scheme, the XM power supply is interrupted due to external reasons, the 1YZJ and 2YZJ relays directly return, the normally-open contacts return to the open state, and the switching loop is invalid.
In this application there are similar circuits, see in detail power +, power-; under the same condition, the power supply is interrupted, but the KJ1 and KJ2 relays can still automatically keep the original switching action state without returning, so that the output node is prevented from misoperation, and the whole switching loop is stable and reliable.
In case of failure of the relay itself:
in the scheme of the Chinese patent with the patent number of 200620166601.0, a 2YZJ relay and a self-holding loop thereof are started through a normally closed node of a 1YJ relay; however, if the 1YJ relay itself fails, when the monitored voltage is normal, the 1YJ1,3 node is in a closed state (it is a normally closed node, the monitoring circuit is not well connected, or the output node returns to the initial closed state in the case of relay failure, etc.), which may cause the switching circuit operation; if the second group of voltage transformers are just in fault maintenance, the switching can be mistakenly carried out, and the secondary circuit is in voltage loss.
The scheme in this application, then adopt decompression, overvoltage relay to monitor simultaneously, all export normally to open the contact and remove start hold relay KJ1, KJ2, if decompression, overvoltage relay self trouble, normally open the node and return to initial open mode, can not influence KJ1, the action of KJ2 relay also can not arouse the return circuit malfunction.
In conclusion, the invention can realize the automatic switching of the flexible and adjustable bus voltage mode, can not cause voltage error switching under the interference of external factors such as relay faults and the like, is favorable for protecting measurement and control equipment and improves the reliability and stability. The false operation of the switching loop under the conditions of relay failure or auxiliary power supply disappearance and the like can be overcome, so that the switching function has good stability and reliability.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (6)

1. The utility model provides a device of automatic switch-over busbar voltage in railway traction office which characterized in that, includes parallelly connected no-voltage relay J1 and overvoltage relay J2 at the output of voltage transformer PT-A respectively to and parallelly connected no-voltage relay J3 and overvoltage relay J4 at the output of voltage transformer PT-B respectively, wherein:
the output pin of the voltage-losing relay J1 comprises a normally open contact A0, the output pin of the overvoltage relay J2 comprises a normally open contact B0, the normally open contact A0 is connected with a reset pin of a holding relay KJ1, the normally open contact B0 is connected with a starting pin of a holding relay KJ1, and the output pin of the holding relay KJ1 comprises a normally open contact E0 and a normally closed contact E1;
the output pin of the voltage-losing relay J3 comprises a normally open contact C0, the output pin of the overvoltage relay J4 comprises a normally open contact D0, the normally open contact C0 is connected with a reset pin of a holding relay KJ2, the normally open contact D0 is connected with a starting pin of a holding relay KJ2, and the output pin of the holding relay KJ2 comprises a normally open contact F0 and a normally closed contact F1;
the normally open contact E0 is connected in series with the normally closed contact F1 and then connected in parallel with the normally open contact F0 to be used as a PT-B main use; the normally open contact F0 is connected in series with the normally closed contact E1 and then connected in parallel with the normally open contact E0 to be used as a PT-A main use; the PT-A main use is switched and voltage output through a change-over switch;
and the PT-B master uses the other transfer switch to carry out switching and voltage output.
2. The device for automatically switching the bus voltage in the railway traction station as claimed in claim 1, wherein the PT-A master uses a manual change-over switch to perform switching and voltage output; and the PT-B master uses the other manual change-over switch to carry out switching and voltage output.
3. The apparatus of claim 1, wherein the type of the voltage loss relays J1 and J3 are the same, and the type of the overvoltage relays J2 and J4 are the same.
4. The device for automatically switching the bus voltage in the railway traction station as claimed in claim 3, wherein model numbers of the voltage loss relays J1 and J3 are RY-D2, and model numbers of the overvoltage relays J2 and J4 are RY-D1.
5. The apparatus for automatically switching bus voltage in a railway traction office as claimed in claim 1, wherein the hold relays KJ1 and KJ2 are of the same type.
6. The apparatus for automatically switching bus voltage in a railway traction office as claimed in claim 5, wherein the hold relays KJ1 and KJ2 are model ST 2-2L.
CN201611115839.5A 2016-12-07 2016-12-07 Device for automatically switching bus voltage in railway traction station Active CN108173338B (en)

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CN113904546A (en) 2020-07-06 2022-01-07 台达电子企业管理(上海)有限公司 Voltage switching circuit and power adapter

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GB2338844A (en) * 1998-04-03 1999-12-29 Peter Jesse Interface for by-passing a failed uninterruptible power supply
CN203352151U (en) * 2013-05-24 2013-12-18 广东电网公司东莞供电局 Differential protection system for asymmetric transmission line malfunction
CN105207344A (en) * 2014-06-09 2015-12-30 鞍钢股份有限公司 Security power supply system and control method thereof
CN203967824U (en) * 2014-06-20 2014-11-26 航天科工深圳(集团)有限公司 The automatic switch-over circuit of distribution power automation terminal and duplicate supply
JP6529766B2 (en) * 2015-01-20 2019-06-12 大和ハウス工業株式会社 Power supply system
CN204794342U (en) * 2015-07-20 2015-11-18 上海致维自动化控制有限公司 Double - circuit power switching over system with record wave energy

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