Longitudinal supply high-voltage wire system compatible with electromagnetic field of railway ac contact system

FIELD: railway transport.

SUBSTANCE: invention relates to longitudinal supply wire systems of non-traction consumers arranged near ac electrified railways. Proposed high-voltage wire system contains three-phase traction transformer connected with contact system and rail-earth and longitudinal power supply line connected with power consumer through electrical meter and consisting of two wires-phases under electromagnetic influence of contact system. Said line is additionally provided with third wire-phase grounded at substation and three-contact switch designed for simultaneously switching off three wires-phases at system supply cutoff mode. All three wires-phase are arranged on supports of contact system or on separately standing supports from field at equal distance from contact system. Electrical meter is made in form of three-element energy meter one element of which is connected to grounded wire-phase in direction of consumer. Use of proposed system reduces asymmetry of voltages at consumers and provides possibility of use of three-element energy meters and precludes emergency situations owing to no resonance conditions with no power losses for resonance.

EFFECT: increased economy of system.

1 dwg

 

The high voltage system longitudinal power refers to the power supply rail less consumers located near electrified with alternating current Railways. A contact network is a single line with the return current through the ground (rail), creating an intense electromagnetic field in the space surrounding the railway. In the area of electromagnetic effects are wired high-voltage line that supplies power to auxiliary services railway located along it. For transmission low-power consumers first category of consumption applied power supply system with isolated neutral 6-10 kV attributed to a safe distance from the railway. For powerful consumers low category power supply widely used high-voltage wire line, are made by using two wires - rail (DPR) or wire - rail (CR) at 25 kV, receiving power from the same winding of the traction transformer, and a contact network, and placed directly on the support of a contact network. For system (RPS) two wires - two phases, on the rail, i.e. the earth, served the third phase. This is due to the power circuit of the traction network, which feeds the electric rolling stock (XPS) on the circuit - contact network, XPS, Rel the earth, "dick substation". The PR system is derived from the DPR at the same voltage in the absence of one phase. The accepted location of the wires DPR in support of a contact network due to technical, economic and topographical conditions, particularly in the cities, mountainous areas, tunnels, floodplains and other areas where the relative from the railroad at a safe distance from the point of view of electromagnetic influence, is not possible.

The location of the wires DPR in close proximity to the contact network creates high levels of induced voltages in the line, as from the magnetic and electric components of the electromagnetic influence of the contact network. The magnetic component affects the line in connected mode DPR under power, thus creating an asymmetry on the receiving end of the line to the consumer. At the same time, there are conditions incorrect metering of electricity consumption. Electrical component affects the line in shutdown mode DPR from power, creating a resonance phenomena, leading to accidents consumers and unnecessary loss of energy at resonance. In some areas of electrified Railways in the existing conditions, the electromagnetic influence of the application of the system DPR is not only impossible, but even dangerous. Enter the listed disadvantages lines DPR under heavy influence of the contact network set forth in Mpeter, Allegresse. The power supply rail less consumers Railways. - M.: Transport, 1985; and in Art. Uwith, Eyushmanova, Wasileski, Mshape. Emergency modes of the equipment connected to the longitudinal line of the power supply according to the "two wire rail", Proc. of New farm power supply. Edited by Dr. Abhisarika. - M.: Intext, 2003.

The above system of longitudinal power supply two wire - rail (DPR) is selected as a prototype. This system is used as the third phase rail - earth. Rail - earth and is used to connect the load (coil of the transformer, using the third phase). The system contains three-phase traction transformer powering the contact network and the longitudinal line of the power supply consisting of two wires-phases under electromagnetic influence of the contact network and supply consumers with electricity through the device metering.

System DPR in terms of electromagnetic influence of the contact network has four major drawbacks.

Magnetic (longitudinal) component of the electromagnetic influence of the contact network creates longitudinal voltage in the wires-phases of the development agenda and distributed along the wire line. At the substation wire line DPR shorted to ground through the internal resistance of the traction transformatorweg contact network and line DPR, that is disproportionately small compared with the magnitude of the load, then at the receiving end (at the load) is the induced voltage, changing symmetrical shape of a triangle voltage on the transmitting end, at the substation. The level of this induced voltage creates no symmetry depends on the current contact network and is constantly changing.

The voltage unbalance among consumers is the first disadvantage of this system.

In addition, the induced current circulating in the circuit: line, load, earth - rail feeding the winding of the traction transformer and the winding current measuring devices, has a direction coincident with the direction of the voltage supply line. The coincidence of the directions of the vectors of current and voltage is perceived by the metering of electricity as the current active power consumption that makes the imbalance in the difference of readings between the true consumption on the load and the indication of metering devices throughout the chain. Typically, this imbalance is referred to power losses. The use of three-element energy meter is not possible, because there is no separate line consumption, it is common for the contact network and the DPR (suction). On DPR used two cell counters, using the method of two wattmeters, which is not applicable in the presence of two sources (primary the power supply and the induced line voltage). For the average site, and depending on the monthly load contact network loss ranges from 15 to 35% of the total consumption of the schedule Manager.

The inaccuracy of metering is another drawback of the system DPR.

The translation system RPS mode disconnection from the power, under certain conditions, causes a strong resonance phenomena. The line disconnected from the traction transformer, falls under electric (transverse) component of the electromagnetic influence of the contact network formed by the capacitance between the contact network and the wires of the line and the load connected to earth. The load has an inductive character and in case of equality of inductive and capacitive impedances occurs sequential resonance with the creation of the load voltage substantially in excess of par, resulting in accident consumers.

This is the third and, one might say, the main disadvantage of precluding the safe operation of the DWP.

The fourth drawback is the extra energy consumption for resonance, which is now included appliances contact network. For example, the power losses in the contact network is equal to the maximum power load of the schedule Manager.

The invention solves the following technical tasks:

1. Reduced voltage unbalance among consumers, and will depend on t is like from the correctness of the choice of the geometry of the arrangement of the wires with grounded occasion (PO).

2. You can use a three electricity meters (third measuring body counter is included in a grounded wire after grounding the load side)that will completely eliminate the incorrect accounting of electricity consumed by the system.

3. Eliminates the occurrence of emergency conditions due to complete lack of resonance phenomena.

4. The lack of resonance and eliminates power loss at resonance, i.e. the system becomes more economical.

These technical problems are solved according to the invention in a high-voltage wire system longitudinal power supply, compatible with the electromagnetic field of the contact network of electric Railways, electrified with alternating current containing a three-phase traction transformer powering the contact network and the longitudinal line of the power supply, consisting of three wires-phase, located at the same distance from the contact network in support of a contact network or free-standing pillars, three-prong switch to disconnect three wires-phases in the shutdown mode of the system from the power metering device power consumption, made in the form of three-element meter with insertion of a third element in a grounded wire-in phase the direction of the consumer.

The profile is a high-voltage wire system longitudinal power supply according to the invention are that it further comprises a third grounded only at the substation wire-phase, and all three wires-phase are the same distance from the contact network in support of a contact network or free-standing pillars, three-prong switch to disconnect three wires-phases in the shutdown mode of the system from the power supply, the unit of energy consumption is made in the form of a three-element meter with insertion of a third element in a grounded wire-phase in the direction of the consumer.

The essence of the invention illustrated by the drawing, which shows the structural diagram of the system of longitudinal power supply for Railways electrified with alternating current and in terms of electromagnetic influences the contact network; where 1 is the traction transformer, 2 - step-down transformer user, 3 - pin network, 4 - line two wires - two phase (DP), 5 - a grounded wire-phase (LC), 6 - switch simultaneously disconnect all three wires, 7 - a three-hour meter, 8 - rails-land.

The longitudinal system power supply consists of a power source (traction transformer) supply 1 contact the network 3, the rails-land 8, two wires-phase (DP) 4 and a grounded wire-phase (LC) 5, all three wires are disconnected by the switch 6, to measure the Oia power consumption included in the line-element of the counter 7, to the line connecting the step-down transformers consumers 2.

The longitudinal system power supply works in the following way: traction transformer 1 is powered trolley system 3 and the rails-to-earth, the same voltage is fed three wires 4, 5, one of which (RFP) at the substation is connected to the rail-earth. Are these three wires on poles contact network with field side so that the distance from the wires to the equivalent pin of the suspension (contact network) were equal, which creates equal conditions the electromagnetic influence of the contact network on these wires. The magnitude and the direction of the longitudinal voltage on all three wires on the receiving end, i.e. at the consumer 2 will be equal, and the triangle voltage does not lose its symmetry. The current from the induced longitudinal voltage in the wires 4, 5, creating the prototype of the energy loss on the counter, in this system will be absent, because the wire 5 at the receiving end, the consumer 2, is not connected to ground, and the circuit for the longitudinal electromotive no. In addition, three-piece counter 7 three elements will compensate and even a slight difference between the EMF of the three wires that may occur due to not exact geometry of the location of the wires 4, 5. In shutdown mode the longitudinal line of the power supply switch 6 wires 4, 5 together with the load, having the second inductive, will is in a free state, and the communication contact system and the earth only capacitive, which eliminates resonance phenomena. The absence of resonance phenomena excludes emergency modes overvoltage and power consumption in response.

The proposed system longitudinal power supply for electric Railways, electrified with alternating current, allows to reduce accidents consumers connected to the system, to improve the quality of energy supplied to the consumer, to ensure the accuracy of the accounting of the energy and reduce the consumption of electricity consumed all the supply substation.

Implementation of the invention are possible at the present time on the basis of standard equipment for the longitudinal lines of the power supply.

High-voltage wire system longitudinal power supply that contains a three-phase traction transformer associated with the contact network and the rail-land, and the longitudinal line of the power supply associated with the electrical consumer via the metering of electricity and consisting of two wires-phases under electromagnetic influence of the contact network, characterized in that the longitudinal line of the power supply is further provided with a third wire-to-phase, grounded only at the substation, and the three-prong vykluchatel is m, designed to disconnect three wires-phases in the shutdown mode of the system from the power supply, all three wires-phase are located on the supports contact the network or on separate supports, and the meter's power is made in the form of a three-element meter, one element of which is included in a grounded wire-phase in the direction of the consumer.



 

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