SU68659A1 - Device for automatic switching on and off the traction substation - Google Patents

Description

The proposed device is designed to automatically turn on a traction substation when an electric locomotive enters a section of the contact line powered by it and to turn off a substation when an electric locomotive leaves this section.

From the known devices intended for the same purpose, it is fundamentally different in that it is based on the use of the phenomenon of voltage resonance in the control relay circuit, thereby eliminating the possibility of spurious switching on short circuits of the contact network.

The device contains a relay that controls the circuit breaker and is connected between the contact wire and the rails in series with a blocking capacitor and an auxiliary transformer, 1 which supplies voltage to the control circuit closed by a special circuit on the locomotive. The latter is connected in parallel with the power plant of an electric locomotive and contains a capacitor and an inductor coil connected in series and proportioned so that they form a resonant circuit with the elements of the control circuit.

An auxiliary transformer (or choke) is included in the feeder that feeds the monitored section of the line, ensuring timely shutdown of the feeder.

The drawing shows a schematic diagram of the proposed device for a substation with one generator and one feeder.

There are four chains between positive and negative tires:

Circuit /, made up of a block capacitor BC (it is also a working capacitance), a current relay P and a supply transformer DC, giving a voltage equal to 3-7% of the DC voltage on the substation screws.

The circuit // that forms the second half of the resonant circuit (/ - //) on the electric locomotive, and is called the driver's chain. This chain consists of a block capacitor 9Bf

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and inductance fiC to compensate for the capacitances of block capacitors (GC-EBC). In addition, a switch should be installed here, which can be used as an automatic locomotive A or a linear contactor.

Circuit /// of the generator of the substation, consisting of the generator G. of the generator contactor (or high-speed automat) and the blocking transformer BT. The voltage of this transformer is slightly less than the voltage of the power transformer, and it is turned on so that in the loop / - /// there is some difference in the voltage of these transformers (counter-switching). This is necessary in order to limit the current flowing through the generator.

Chain IV electric locomotive engines, consisting of the engines themselves and the starting devices (CE controller).

The work of the scheme proceeds in the following way.

Suppose that in the area of operation of this substation there were no electric locomotives and the substation was turned off. When an electric locomotive enters the area l, the substation of the substation, the machinist turns off the engines of the electric locomotive (with closed machine A). Then the closed loop of the / - // circuit will observe the phenomenon of voltage resonance, since the resistance of the value of / 1 is generally capacitive, and the driver’s value is inductive (the resistance of the inductor is greater than the resistance of the block capacitor), and they are close to each other in magnitude.

At resonance, the control value current will be relatively large, so that relay P will operate and turn on the converter unit from both the AC and DC side.

When the unit is connected, the value / circuit through two two-way circuits // and /// is connected, the inductive resistance in the circuit decreases, the resonance is detuned and the current drops. But the relays do not switch off, because (, H.i is taken from HnnKiv. Coefficient

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return. Thus, the unit remains switched on.

After that, the locomotive driver turns on electric locomotives. In this case, circuit IV is connected in parallel to the circuits // and ///. The alternating current strength in this case varies slightly and, moreover, increases. Consequently, in this case too, the relay P, and with it the generator G, will remain on.

If the electric locomotive leaves the area of operation of the substation or the automatic locomotive is turned off, then one circuit will remain in operation / - ///.

In this circuit a. d. will be very small (the difference between the voltage of the power supply and the transformer) and the current in the circuit will be very small. The relay P turns off and turns off the unit.

Even if, with the unit turned off, the contact wire on the relay is short-circuited, there will be a circuit consisting of one value /. Since there will be no voltage resonance here, the current strength will be significantly less than when the electric locomotive is in the vicinity of the substation and the relay P does not work. If after that an electric locomotive enters the plot and the driver tries to turn on the unit by locking the // circuit, then switching on will not occur, since there will be no resonance.

When installed at a mercury substation substation, an additional circumstance appears: a more or less significant pulsation (mainly the first harmonic of the pulsation) will penetrate into the relay circuit and bias it. In order not to be too large (a small bias is useful, it reduces the return coefficient of the relay), when the relay P is not turned off when the circuit is opened // and IV, it is necessary to limit the harmonic currents in the circuit of the relay P. Since the first harmonic of the pulsation at six-phase mercury Since the rectifier will be the sixth in relation to the main frequency of the current in the price of the unravlepi (50 gu), then we select the appropriate value of H Ы inductive

1 capacitive (1 resistance in the relay circuit, it is possible to create a very large resistance for the usshed frequency (4-5 times greater than for the main control current). The third harmonic of the pulsation in response to the oscillation) will be eighteenth current and almost no effect render will not. Due to the partial bias, you create a natural snake iiiKc to:) the reset return relay, which will require less artificial reduction of it.

The proposed device is intended mainly for industrial electrified paths and, in particular, underground ores of HeiiMHMX, where the number of operating electric locomotives is insignificant (often -2), so that in these conditions very often significant portions of the contact network can be permanently disconnected.

The inventor notes the following advantages of the proposed device: 1) constant readiness for operation, 2) switching on the electric locomotive at will of the driver, i.e. when it is required by the consumer, and instantaneous switching off of the substation after the end of the need, 3) impossibility of switching on the substation to emergency mode, for example , for a short circuit, 4) there is no need to have a reclosing relay and their limitation, and finally, 5) the possibility of performing a circuit with the most6: .iee simple standard high-current relays.

Subject invention

Claims (2)

1. A device for automatically turning on a traction substation at the entrance of an electric locomotive to the part of the contact line it feeds and for switching off ;; a substation at the exit of an electric locomotive from this section, consisting of an automatic feeder switch controlled by a relay connected between the contact wire and ground in series with an auxiliary transformer serving to supply voltage to the control circuit closed by the installation of an electric locomotive, characterized in that the false action of the relay during short circuits of the contact line in series with the relay and the transformer is switched on the blocking capacitor, and in parallel with the power plant electr It included for circuit comprising a capacitor and an inductor connected together in series and proportioned so that they form with the other circuit elements of the control resonant circuit. 2. In the device according to claim. 1, the application of an auxiliary transformer included in the feeder that feeds the controlled section of the line. hg Q pg