SU147661A1 - Device for automatically checking the readiness of a mechanical rectifier for inclusion - Google Patents

Description

For one reason or another, for example, accidental re-ignition, etc., the automatic shutdown of a mechanical rectifier takes a long time to check whether it is ready to switch on, whereas, under production conditions, it is often unacceptable to turn off the power supply even for a few minutes.

To reduce the time required to prepare a mechanical rectifier for switching on, a device is proposed consisting of a system of electromagnetic time relays activated by an oil switch auxiliary contact and a multi-contact actuating relay, which, when activated, sends a command to close the short circuit breaker and turn on the engines of the fan and oil pump , synchronous motors of contact devices and power transformer on the AC side.

In order to prevent the device from operating in the event that the switch-off of the rectifier occurred due to a malfunction in the-lubrication or cooling system, normally-closed relay contacts are located in the timing-switch-on circuit that control the pressure and temperature of the oil in the lubrication system and cooling air.

An automatic circuit breaker can be used to switch on the mechanical rectifier, which is installed between the mechanical transformer power transformer and the commutating switches.

In order to prevent the secondary operation of the device in the event of a mechanical shutdown of the mechanical rectifier, an auxiliary relay was used.

An optical or acoustic signal can be applied to signal the end of the automatic check of the readiness of the mechanical rectifier for activation.

The drawing shows a diagram of the device.

No. 147661- 2

Time relay 1 RPG (type RE-100) is turned on with a break of normally open contacts of the oil switch B and one of the main switches of the reverse current LOT, i.e. when the mechanical rectifier is turned on for the load. When the mechanical rectifier is turned off by the normally closed block-contact of the oil switch B, the 2 RPG relay turns on, and then after about 0.5 seconds, the 1 RPG time relay disappears, which by its normally closed contact turns on the multi-contact RVU relay (EP-40 type, which using its normally open contacts, recovers short-circuit breakers, turns on the motors of the cooling fan of the mechanical rectifier, the oil pump, lubricates the contact devices, and switches on the synchronous motors of the contact devices.

Then, simultaneously with switching on the excitation of synchronous motors of contact devices by normally open contacts of the RVV relay, the ERPG time relay is de-energized, which, with a delay of 1.0-1.5 seconds, with its normally closed contact turns on the oil switch B, which turns on the alternating current side The drawing does not show the mechanical rectifier if the pressure and temperature of the oil and cooling air are within acceptable limits. In this case, a starting circuit is automatically activated, which ultimately includes the contact time controller (not shown in the drawing). The 2 RPG relay is introduced into the Scheme in order to exclude the possibility of switching on the oil switch B of the mechanical rectifier 1 1 of the switch if the first switching on of the transformers on the AC side was not performed.

After the end of the automatic check, when the mechanical rectifier is in good condition and can be switched on for a load, the signal light turns on. Turning on the lamp is produced by the normally closed contact of the RVV relay, which activates the contact time controller. In the drawing, the elements of the apparatus of the control circuit of a mechanical rectifier of the Kharkov Electromechanical Plant consider that the proposal can be used at high-power converter stations and mechanical rectifiers.

Subject invention

Claims (5)

1. Device for automatic verification of the availability of a mechanical rectifier for switching on after shutdown caused by accidental back ignition and so on. The reasons are characterized in that it consists of a system of electromagnetic time relays activated by an oil switch block contact and a multi-contact executive relay which, when triggered, issues a command to re-inject the short-cutter and turn on the motors of the fan, oil pump, synchronous motors of contact devices and the power transformer on the side not ac. 2. The device according to claim 1, wherein the time relay circuits include normally closed relay contacts that control the pressure and temperature of the oil in the lubricant and cooling air system, in order to prevent devices in the event that a shutdown of the rectifier has occurred due to a fault: peavilnoy work in the lubrication system or cooling. 3. In the device according to claim 1, use an automatic current device installed between the power transformer of the switch and the switching throttle to turn on the rectifier. 4. Device on PP. 1 to 3, which is characterized by the application of an auxiliary relay to prevent secondary operation of the device in the event of rectifier disconnection. 5. In the device according to paragraphs. 1-4, the application of an optical or acoustic signal, activated after the end of the automatic check of the rectifier's readiness for inclusion.