SU758015A1 - Device for testing contact circuit for short-circuiting - Google Patents

Description

The invention relates to the field of electrical engineering and can be used in AC contact networks of multi-track industrial railway transport.

Devices are known that contain a phase splitter, auxiliary electric rolling stock machines, a voltage transformer and a residual voltage sensor [ΐ].

The disadvantages of the known devices are in their low speed and reliability.

The closest in technical susch- 'NOSTA ⁵ is a device for testing the contact network koro'tkoe circuit comprising a voltage transformer, the relay, filter, the residual voltage sensor, a power supply ²⁰ and relay repeaters [2] · The disadvantages of this device are also its low speed and reliability

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The purpose of the invention is to increase speed and reliability.

This goal is achieved by the fact that, in a well-known device that contains a sensor of residual voltage, the first trans ⁵ voltage formatter, the primary winding of which is connected to a contact network connected to the traction substation busbars, is one of the conclusions of the secondary winding; the first voltage transformer coi ”0 is connected to the filter input directly, and the other through the first closing contact of the start relay, the coil of which is connected to the positive pole of the power supply by one of the terminals and the negative terminal of the power supply to the negative terminal of the protection relay , a voltage phase comparison unit and a second voltage transformer are introduced, and the residual voltage sensor shunts the output of the phase comparison voltage module, one of the inputs of which go connected to the output

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758015

the filter and the other is connected to one of the SECONDARY Winding SECOND voltage transformer directly, and its other output through the second closing contact of the start relay, and the primary winding of the second voltage transformer is connected to the traction substation buses.

The drawing shows a block diagram of the device. ten

The device contains voltage transformers 1.2, start relay 3, containing coil 4 and closing contacts 5.6, filter 7, voltage phase comparison unit 8, residual voltage sensor 9, power supply 10 and repeaters of protection relay 11 ,. 12,

The device works as follows.

The primary winding of the voltage transformer 1 is connected to the contact network '13, containing the partition post 14 and connected to the buses of the traction substation 15, 16 through switches 17 18, 19,20. ’25

The primary winding of the voltage transformer 2 is connected to the traction substation bus 15. The voltage from the secondary winding of the voltage transformer 1 is through. closing contact 5 30

start relay 3 and filter 7, designed to filter the highest harmonic components of the residual voltage, is supplied to one of the inputs of the voltage phase comparison unit 8, to another input _{35 of} which, via the closing contact 6 of the start relay 3, voltage is supplied from the secondary winding of the voltage transformer 2.

Phase comparing unit 8 voltages You are a full ₄₀ so that the voltage on its output proportional to the residual stress and depends on the phase shift 4 residual voltage and traction substation bus 45; 15, moreover, during normal operation of the contact network 13 (= 0), the voltage at the output of the voltage phase comparison unit 8 is zero.

In the case of switching off the switches 17, 18, 19, 20 and the absence of a short circuit in the contact network 13, the phase shift will differ from zero, the residual voltage sensor 9 will work and thereby indicate the presence of residual voltage and the absence of a short circuit in the contact network 13.

and ·.

The device has increased reliability and speed, which eliminates the false positives of switches and networks to a minimum interruption of power in the contact network.

Claims (1)

Claim The device for testing the contact network for a short circuit containing a residual voltage sensor, the first voltage transformer, the primary winding of which is connected to the contact network connected to the traction substation buses, one of the terminals of the secondary winding of the first voltage transformer is connected to the filter input directly and the other through the first closing contact of the start relay, the coil of which is connected to one of the terminals with the positive pole of the power source, and the other with the negative pole of the power source These are connected via series-connected closing contacts of the repeaters of the protection relay, which, in order to increase speed and reliability, a voltage phase comparison unit and a second voltage transformer are introduced, and the residual voltage sensor shunts the output a phase comparison unit, the voltage of one of the inputs of which is connected to the output of the filter, and the other is connected to one of the terminals of the secondary winding of the second voltage transformer directly, and to the other of its output - via the second contact a start relay, and the primary winding of the second voltage transformer is connected to the traction substation buses.