SU1128326A1 - Device for operational protecting of power-generating unit - Google Patents

Abstract

DEVICE FOR TECHNOLOGICAL PROTECTION OF THE ENERGY BLOCK,. The two sensors of a monitored parameter, connected to the zero-organ and to the inputs, respectively, of the first and second analog-relay converters, make contacts, which are connected in series to the executive relay and the intermediate relay, are aux. So that, in order to increase reliability by indicating the faulty element and its Localization, the null organ is equipped. two output relays connected to the threshold element of the zero-organ through diodes of different polarity, and the closing contact of each converter is shunted by the closing contact of the intermediate relay, the winding terminal of which is connected in series b connected break contacts of both converters and the closing contact of one of the output relays , the opening contact of which is connected to the winding of the output of the intermediate relay.

Description

The invention relates to the management of power equipment (boiler, turbine, etc.) in emergency conditions.

Technological protection switches off the object in case of a monitored parameter deviation beyond the setpoint, {(protection devices are subject to high reliability requirements.

A device is known For technological protection of a power unit containing two sensors of a monitored parameter, which are connected to the inputs of the first and second analog-relay converters, respectively, containing “15 each threshold element and each code relay, the closing contacts of which are connected in series to the executive relay l, j

However, if any of the elements fails, the device loses its operation.

It is also known a device for technological protection of a power unit containing two sensors of a monitored parameter connected to zero-i,. the body containing the threshold element and the output relay, and the inputs of the first and second converters, respectively, the closing contacts 30 of which are connected in series to the executive relay. The null organ compares the current signals of both sensors. Their discrepancy suggests that one of. sensors defective - ven 2.

However, in the known device, the null organ does not determine which of; , two sensors are faulty (such determination is carried out manually on the working object, which does not exclude the possibility of its erroneous switching off by the operator), the object remains unprotected for the duration of the search and elimination of the malfunction.

The purpose of the invention is to increase the reliability of the device by indicating the faulty element and its localization.

This goal is achieved by the fact that 50 in a device for technological, protection of a power unit containing two: sensors of a monitored parameter, connected to a null organ and an input (Accordingly, the first and second 55 analog-relay converters, the closing contacts of which are connected in series to the executive a relay and a midstream relay, the zero-organ is equipped with two output relays connected to the threshold element & zero-organ through diodes of different polarity, and the closing contact of each converter is shunted m intermediate relay contact, to which are connected input winding connected in series break contacts both transmitters and one normally open contact of relay outputs zero-organ., the break contact is connected, to the winding chen vtoda intermediate relay.

The drawing shows the proposed device.

The state of the object is monitored by the parameter measured at point 1, simultaneously via two channels. The first channel consists of a sensor 2 and a converter 3 connected in series with it, containing a threshold element 4 and a Vrdsod relay 5 with a closing contact 6 and opening contacts 8. Accordingly, the second channel consists of a sensor 9 and a converter 10 connected in series with it, holding the threshold element 11 and output relay 12 with closing contact 13 and opening contacts 14 and 15. The sensor current signals compares zero-. The organ 16, containing the threshold element 17, connected to it through the diode 18, the first input relay 19 with the closing contacts 20 and 21 and different. the contact 22 and the second output relay 24 connected via the diode 23 to the output of the threshold element with the closing contacts 25 and 26 and the opening contact 27.

The positive power bus + is connected via series-connected closing contacts 6 and 13 of the output relays of each control channel connected to the first output of the executive relay 28, the second output of which is connected to the negative power bus -.The closing contact 6 of the first channel is shunted by the closing contact 29 of the intermediate relay 30 winding 31 the input of which is connected to the positive power bus through serially connected closing contact 20 of the first output of the zero-organ and disconnecting contacts 7 and 14 of the converters and the winding 32 of the outputs is connected via the break contact 22 of the first output relay of the null organ. Cc (responsibly closing contact 13 of the second channel is shunted by closing contact 33, intermediate relay 34, the input winding 35 of which is connected to the positive power bus through series-connected closing contact 25 of the second output relay. Zero organ and opening contacts 8 and 15 of the converters, and winding Ka 36 of the output is connected via the disconnecting contact 27 of the second output relay of the zero-organ. The element 37 and indication is connected to the power rails via parallel-connected closing contacts 21 and 26 of the zero-organ. Formers and a zero-organ are used serially, devices, for example, a summation and signaling unit of the BSN type. The device operates as follows. If the current signal 3, 3 sensors exceeds the preset setting 3, the output relay of the converter operates thus the analog input signal is discrete. In normal operation of the object and in good condition of the sensors J 9. the shorting contacts 6 and 13 of the converters are open, the executive relay 28 is de-energized. In the emergency mode of the Ug -J Ttf object, both are triggered. the converter, the coil of the performer Nogo relay 28 is flowed around the current through the closed contacts 6 and 13, the object is emergency shut off by protection. If one of the sensors, for example, sensor 2, fails, its current signal deviates towards the setpoint, the converter 3 is activated and its contact 6 is closed, but the object does not switch off falsely, since the closing contact 13 of the second converter remains open. In this case, the difference between the current signals 2 - 3C is emitted for a given zone and the sensitivity of the zero oragan j-3 and its contact 26 is closed, which leads to the ignition of the 37-indication element:. . 264 When a sensor, for example sensor 9, malfunctions that threaten protection fails, its current signal is diverted to 9TO1 opposite to setting 3 in the case of a failure. When current signals are different, the current output 24 of the zero-body triggers, the contacts 25 and 26 close and the contact 27 opens. The input 35 winding 35 of the intermediate relay 34 flows around the current, the relay trips, contact 33 closes the output 13 of the faulty channel. . Ignition of the display element 37 informs the operator of the fault. The operator receives the deciphering in which particular channel and how the malfunction arose according to the state of the regular indicating elements (not shown) put out to; Front panels of null organ and transducers. The state of the indicating elements. (+ Ignited, - extinguished) and the state of protection are shown in the table. . Having detected and having identified a malfunction, the operator takes the necessary measures to eliminate it in a timely manner. After the failure has been restored, the null organ returns to its original state, through the closed contact 27 of the output coil 36 of the intermediate relay 34 is flowed around again, the memory is erased, the protection again functions properly in the waiting mode. In the previous case the emergency situation at the facility, the protection is triggered by closing the contact 6 of the other good dripping, The effect of the use of the invention is due to the warning of the emergency damage of the equipment when non-tripping environmental protection. Per one 800 MW unit, the loss of possible non-compliance of protection requests is 54.6 x 10 rubles / year. At the power unit, equipped with the proposed devices Easchtsy, due to the timely detection of sensor failures this damage is absent.

h +

Functionally in standby mode.

Worked right

False sensor 2 triggered

Falsely triggered sensor 9

Sensor 2 failed Sensor 9 failed

Claims (1)

1 DEVICE FOR TECHNOLOGY; CLEAN PROTECTION OF THE POWER UNIT, containing two sensors of the controlled parameter connected to the zero-organ and the inputs, respectively, of the first and second analog-relay converters, closing contacts, which are connected in series to the executive relay And the intermediate relay, which means that, in order to increase reliability by indicating a faulty element and its Localization, the zero-organ is equipped with two output relays connected to the threshold element of the zero-organ through diodes of different gender polarity, and closes? The contact contact of each converter is bridged by the closing contact of the intermediate relay, to the input winding of which are connected the serially connected opening contacts of both converters and the closing contact of one of the output relays of the null organ, the opening contact of which is connected to the output winding of the intermediate relay.