SU1709122A1 - Mine traction substation - Google Patents

Abstract

The invention relates to the mining industry and m. Used to power contact networks of electric locomotive haulage of mines and mines. The purpose of the invention • improving the operational reliability of the device. The device contains a high-voltage circuit breaker 1, a three-phase power transformer 2. a capacitor battery 3, a power rectifier 4, a single-thyristor bridge 5 With a thyristor electrode control unit 6, a minimum current relay 7, a load presence relay 8, a smoothing capacitor 9 ^ transformer 10 voltage, the reference diode 11 and the contact wire 12. When a locomotive is de-energized, the relay 8 controls the presence of the load and opens its contacts on the power supply circuit of the control unit 6 and does not control the thyristor electrodes, which It causes the diode rectifier 4 to lock-up. This activates the minimum current relay 1, which ensures continuity of power during short-term load drops. 1 il.

Description

The invention relates to the mining industry and can be used to power contact networks of electric locomotive haulage of mines and mines.

The purpose of the invention is to increase the operational reliability of the device.

The drawing shows a general schematic diagram of a mine traction substation.

The device contains a high-voltage switch 1, a three-phase power transformer 2, a capacitor battery 3, a rectifier 4, a thyristor diode bridge 5 with a thyristor electrode control unit 6, a minimum current relay 7, a load presence relay 8, a smoothing capacitor 9, a voltage transformer 10 , reference diode 11, contact wire 12.

The power transformer 2 through the switch 1 is connected to the common three-phase current network.

The capacitor battery 3 is connected to the open star of the secondary winding of the power transformer, and the output of this winding is connected in parallel to the three-phase inputs of the power rectifier 4 and the diode-thyristor bridge 5 with a short-circuited output and with the unit 6 switching on the control of the thyristor electrodes.

The output of the power rectifier 4 through the minimum current relay 1 with the de-energization of the disconnection is connected to the contact wire 12 and the rails 13. The electric locomotive 14 is provided with an lighting circuit 15.

The winding of the load control relay 8, shunted by a capacitor 9 to ensure voltage smoothing and deceleration, is included in the secondary winding of the voltage transformer 10, the second terminal of which is grounded, and then through the reference diode 11 the relay winding is connected to the contact wire 12.

The device works as follows.,

In the initial state, when there is no load, the switch 1 is on, the primary winding of the transformer 2 under the supply voltage. There is no electrolytic locomotive 14 at the site of the railway, the relays 7 and 8 are de-energized, the diode-thyristor bridge 5 is switched on for a short circuit (short-circuit), but the short-circuit current is limited by the included resistance of the capacitor battery 3.

A capacitor battery works as a reactive power compensator in a well-known pattern. Trolley wire is de-energized.

When a locomotive is de-energized (as when the pantograph is raised), the load control relay 8 is activated and opens its disconnecting contacts 8-1 in the power supply circuit of the thyristor electrode control unit 6. This will cause the thyristor bridge to be locked and the DC voltage from the power supply, rectifier 4 will be applied to the load (p. Wire 12). At the same time, the minimum current relay is turned on and with its contacts 7-1 it will ensure the re-opening of the power supply circuit of the unit 6. The contacts 7-1 of the relay 7 have a slowdown to short circuit, which ensures the continuity of the power supply during short-term load shedding caused by the vibration of the pantograph. Relay 8 returns to its original state, as the voltage across

The output of the power rectifier is many times greater than the voltage of the secondary winding of the transformer 10 (according to the condition of its choice), and the reference diode 11 will close.

When the load is removed, the relay 7 is de-energized, the thyristor electrode control unit 6 receives power and the circuit returns to its initial state.

Claims (1)

Claim Mining substation comprising a high-voltage switch connected to a three-phase power transformer, a capacitor battery and a power rectifier, characterized in that it is equipped with a voltage transformer, a diode-thyristor bridge with an electrode control unit to increase its operational reliability thyristors, a reference diode, a minimum current relay with deceleration for tripping and a load control relay, with one output of the secondary winding of a voltage transformer Connected to the bus of zero potential, and the other through series-connected load control relays and a reference diode connected to the contact wire, the capacitor battery is included in the open secondary star of the three-phase power transformer, the other terminals of which are connected to the outputs of the thyristor bridge, the output of which is short-circuited and connected through a power rectifier to the track of the traction network and to one output of the undercurrent relay, the other output of which is connected to the contact wire row, the break contacts connected in series both relays are connected between the control electrodes of the thyristors unit and power source.