RU172099U1 - AC POSITION SECTION POST - Google Patents

Abstract

The utility model relates to the automation of power supply systems, namely, to the automation of sections of a section of a contact AC network. To achieve the above purpose, a circuit-breaker closing electromagnet, a closing contact of the output relay of the protection unit of the automation device for connecting the power supply lines and a time relay coil with a closing contact are introduced the contact of the output protection relay is configured to supply voltage from the "+" bus through a parallel-connected output shorting contact УККЗ and (or) УПЗЗ to the first output of the time relay, the second output of which is connected to the “-” bus, and through the make contact of the time relay from the “+” bus, the voltage is supplied to the first output of the switch solenoid, the second output of which is connected to “ - "to the bus. The technical result in the implementation of the claimed utility model is to achieve a minimum time of lack of voltage in the traction network during a passing short circuit by performing high-speed (accelerated) automatic reclosure of power supply lines of the post catenary ektsionirovaniya UKKZ at work and (or) UPKZ. 1 ill.

Description

The technical field to which the utility model relates.

The utility model relates to the automation of power supply systems, namely, to the automation of posts for sectioning a contact AC network.

State of the art

In [1], a section of a contact network with introduced devices for automating circuit breakers for connecting contact line supply lines, including a fault finding device block (UPC) on the contact network, a unit for a passing (steady) short circuit monitoring device in a disconnected contact network, and a block is considered circuit breaker protection appropriate connection. Each connection of the supply line of the contact network of the sectioning station with switches is equipped with voltage and current transformers.

Thus, in accordance with the prototype [1], a section of a contact AC network with switches on the connections of the supply lines of the contact network is considered, containing current transformers, single-phase voltage transformers and automation devices for circuit breakers of the connections of the supply lines, in which the block of the control device is passing (stable) short circuit (UKKZ) in the disconnected contact network with the output closing contact UKKZ and the block of the device for short circuit search (UPKZ) on the circuit tnoj networks make contact with the output connected to circuits UPKZ voltage transformer secondary winding and the protection switch unit - to the circuits of secondary windings of voltage transformers and current.

The disadvantages of the prototype are as follows. In accordance with the regulatory document [2], the scheme for automating the power supply of the traction network section between the sectioning station and traction substations works as follows. When a short circuit occurs in the section under consideration, the corresponding circuit breakers for connecting the supply lines of the contact network of the sectioning station and traction substations are disconnected from protection, then the switch for connecting the supply line of the substation with a delay time t ₁ = 5-7 sec [2] is turned on by the reclosure, and then when voltage appears in the traction network at the sectioning station (which is controlled by the voltage transformer of the sectioning station), the connection switch for the supply line of the sectioning station is turned on via the reclosure. Thus, the time of absence of voltage in the traction network exceeds 5-7 seconds. In this case, in electric locomotives (for example, VL80s), the traction mode scheme is automatically “disassembled”. This means that to restore it, the driver will need at least 1-2 minutes and heavy trains can stop on the heights [4]. It should be noted that, unfortunately, it is impossible to make high-speed automatic reclosure (BAPV) circuit breakers for the power supply lines of the traction substation due to the absence of single-phase voltage transformers on these connections connected from the traction network in the projects. Thus, with a passing short circuit in this case, a full-time reclosure of supply line connections is performed, supplying voltage to the disconnected contact network with a sufficiently long time, which is a serious disadvantage of the prototype.

Utility Model Disclosure

The objective of the utility model: with a passing short circuit, to achieve the minimum time of absence of voltage in the traction network by performing high-speed (accelerated) reclosure of the supply lines of the post section of the contact network during the operation of the UKKZ and (or) UPKZ. In other words, it is necessary to change the algorithm for automating the sections of the AC contact section with the introduction of a high-speed automatic reclosure at the sectioning station.

The technical result of the claimed utility model consists in the fact that with the introduction of a high-speed automatic reclosure of the supply lines of the contact section sectioning station, carried out from the UKKZ and (or) UPKZ units, the efficiency of automation of power supply of the inter-substation zone is increased, since with a short circuit the power supply is quickly restored.

To implement the technical result, a section of an AC contact network with switches on the connections of the supply lines of the contact network is proposed, containing current transformers, single-phase voltage transformers and automation devices for circuit breakers of the connections of the supply lines, in which the control unit for the passing stable short circuit (UKKZ) is switched off a contact network with an output closing contact UKKZ and a block of a short circuit search device (UPKZ) on the contact the mains with the output closing contact of the CPC are connected to the secondary circuits of the voltage transformer, and the circuit breaker protection circuit is connected to the secondary windings of the voltage and current transformers, while the circuit breaker electromagnet, the closing contact of the output relay of the protection unit of the automation device of the circuit breaker and a time relay coil with a make contact, and the make contact of the output protection relay is configured to supply voltage from the “+” bus through parallel the included output closing contact of UKKZ and / or UPKZ to the first output of the time relay, the second output of which is connected to the “-” bus, and through the closing contact of the time relay from the “+” bus, the voltage is supplied to the first output of the circuit-breaker solenoid, the second output of which is connected to "-" to the tire.

Brief Description of the Drawings

The Figure shows a diagram of the claimed device.

Utility Model Implementation

Consider the possible time of supplying voltage to the traction network with various options for power supply and protection.

With the selective version of the operation of the traction substation protection and the sectioning station, taking into account the operation of the second stages of distance protection and the reserve time for the operation of the UAV, the voltage in the traction network will appear in 0.3 + 0.3 = 0.6 sec.

In case of non-selective or partially non-selective [5] variant of operation of protections with zero time delay, with sectioning posts on circuit breakers and individual protections, the time of the automatic overvoltage protection is 0.3 sec.

The indicated time of the BAPV (0.3-0.6 sec) will be during the operation of the UKPZ. If the BAPV is operated by the UKPZ, then a time of 0.3 seconds should be added to the possible operation of the residual current circuit breaker of the circuit breakers of the power supply lines of the contact network. So, the time of the absence of voltage in the contact network in the presence of an unladen voltage suppressor at the sectioning station will be 0.3-0.9 seconds, which is significantly less than the time in the prototype (5-7 seconds). The main thing is that with BAPV with a time of 0.3-0.9 sec, it is possible to "hold" the traction mode of an electric locomotive with a machine phase splitter, since the traction mode scheme in an electric locomotive (for example, VL 80s) "understands" after 1-2 seconds [ four].

To explain the operation of the section of the contact network with switches on the connections of the supply lines and BAPV, we consider the scheme of the claimed device in the Figure with the following notation:

1 - bus post sectioning;

2, 3, 4, 5 - switches;

6, 7 - contact network;

8 - current transformer;

9 - voltage transformer;

10 - protection block;

11 - make contact of the output relay of protection;

12 - block short-circuit monitoring device (UKKZ);

13 - make contact of the output relay of the UKKZ block;

14 - block device search short circuit (UPKZ);

15 - make contact of the time relay in the block UPKZ;

16 - make contact of the output relay of the control unit;

18 - electromagnet turning on the switch 5;

19 - automation unit of the switch 5 connecting the supply line of the contact network;

20 - automation device connecting the supply line of the contact network to the switch 5;

21, 22, 23 - the same goes for switches 2, 3, 4;

24 - point of short circuit.

After an emergency shutdown of the circuit breaker 5, for example, as a result of a short circuit at point 24, the control devices for the passing (stable) short circuit of UKKZ 12 and (or) the search for damage of the UKPZ 14 on the contact network 6 are triggered. In the case of a passing short circuit, the output contact of the UKKZ 13 and (or) the output contact of the control unit 15 closes and when the contact of the output protection relay 11 is closed with the operation of the time relay 16, carried out with a time of 0.3 seconds (stock time) and its contact 17, a command is issued to turn on the switch 5 through e ektromagnit circuit breaker 18. At steady short-circuit output terminals 13 and 15 UKKZ blocks 12 and 14 respectively UPKZ not closed and the circuit breaker does not occur.

The UKKZ and UPKZ devices complement each other, for example, when the UKKZ device did not work (in the absence of electric rolling stock in the controlled area or when the electric rolling stock in the area without machine phase splitters) or the USPZ device did not work (in the absence of an adjacent connection of the supply line of the contact network or the connection of the DPR )

Literature

1. Patent for utility model No. 160050 dated 10.28.2015 “Post sectioning the contact AC network” (German L.A., Korneev V.A., Popov D.S., Yakunin D.V.). Publ. 02/27/2016. Bull. No. 6.

2. STO RZD 07.021.2-2015. Protection of railway power supply systems against short circuits and overload. Part 2. Methods for selecting action algorithms, lock settings and time delays of automation in a traction power supply system.

3. Guidelines for the relay protection of traction power supply systems. M .: "TRANSIZDAT", 2005, - 216 p.

4. German L.A., German V.L. Automation of power supply traction AC network. Monograph. M .: MIIT, 2014.174 s.

5. Pupynin VN, Subkhanverdiyev KS, Nikolaev MV Partially non-selective protection of the contact network / Lokomotiv, 2015. No. 9. S. 40-42.

Claims (1)

Section station for an alternating current contact network with switches on the connections of the supply lines of the contact network, containing current transformers, single-phase voltage transformers and automation devices for circuit breakers of the connections for the supply lines, in which the unit for monitoring the passing stable short circuit (UKKZ) in the disconnected contact network with an output closing contact UKKZ and the block of the short circuit search device (UPC) on the contact network with the output closing contact UPC are connected to the circuit Iam of the secondary winding of the voltage transformer, and the circuit breaker protection unit - to the secondary circuits of the voltage and current transformers, characterized in that a switch-on electromagnet, a closing contact of the output relay of the protection unit of the automation device of the power supply connection switch and a time relay coil with a closing contact are inserted moreover, the make contact of the output protection relay is configured to supply voltage from the "+" bus through a parallel-connected output make contact of UKKZ and / and and to a first terminal UPKZ time switch, the second terminal of which is connected to the "-" bus, and through normally open contact of the time relay "+" bus voltage is supplied to the first terminal of the circuit breaker the electromagnet, the second terminal of which is connected to the "-" bus.

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