SU1534605A1 - Device for heating factory-assembled switchgear with monitoring system - Google Patents

Abstract

The invention relates to electrical engineering, in particular to heating systems of complete device distributors. The purpose of the invention is to simplify the device by eliminating the control of the temperature field around the heating element. In the power supply circuit of the heating elements, a current control organ is installed, the output of which through the threshold organ is connected to the blocking output of the BANCH element. The permissive entry of the BAN element through the DELAY element is connected to the second OR element. The output of the prohibition element is included in the alarm circuit about the damage of the heating elements. When heating elements from the temperature or humidity control unit are activated, the signal through the first and second elements OR, the DELAY enters the permissive input of the BAN element. If all heating elements are in good condition, the output of the current control organ is sufficient for the signal to pass through the threshold organ to the entry prohibiting element BAN. If one or several heating elements are damaged, there is no signal at the exit of the trade union, the alarm is issued indicating that the heating elements are damaged. 1 il.

Description

The invention relates to electrical engineering, in particular to complete switchgears for outdoor installation (KRUN).

The aim of the invention is to increase the reliability of the device by eliminating the control of the thermal field in the zone of each heating element.

The drawing shows the functional diagram of the device.

The device contains temperature control units 1 and humidity 2, the outputs of which are connected to the first and second inputs of the element OR 3, the output of the element OR 3 is connected to the control circuit of the switching device 4. The switching device 4 is installed

between the power source 5 and the heating elements 6. Between the switching device 4 and the heating elements 6, a current control body 7 is installed. The output of the latter is connected through a threshold body 8 with a prohibiting input of the BAN 9 element. The output of the first element OR 3 is connected to the first input of the second element OR 10, the output of which is connected through the DELAY 11 element to the enabling input of the BAN element 9. The second input of the second element OR 10 is connected to the output of the switching device 4, the output of the element BANGE is included in the signaling circuit of the heating system malfunction.

The device works as follows.

In normal operation, the signals from the temperature control units 1 and the humidity 2 of the air are absent, the switching device 4 is switched off and the heating system is in the disconnected state. When the temperature control unit 1 or the humidity control unit 2 is triggered, the signal through the first element OR 3 is fed to the control input of the switching device 4 and the first input of the second element OR 10. When the switching device 4 is turned on, the heating elements 6 are powered. At the output of the current control unit 7, a signal appears, the level of which depends on the amount of current flowing, i.e. depending on the number of operating heating elements 6. The setting of the triggering of the threshold organ 8 is chosen so that at its output a signal appears only when all heating elements 6 operate. If all the heating elements 6 are good, then a signal appears at the output of the corona organ 8 arrives at the prohibiting input of the element BAN 9 After the time determined by the exposure of the element DELAY 11, the signal arrives at the permissive input of the element BAN 9. Because of the presence of the signal at the prohibitory input of the BAN 9, the alarm has failed Equal heating system does not work. If one or several heating elements 6 do not work, the current consumption decreases and the output signal of the threshold organ 8 is absent, therefore

with Q

0

five

0 35 40 45 Q

55

through the element BAN 9, the signal passes and turns on the alarm about the failure of the heating system.

The switching device 4 can be switched on manually or via remote control. In this case, after switching on the switching device 4, the signal goes to the second input of the second element OR 10 and through the DELAY 11 element to the enabling input of the BAN 9. It is thus monitored the health of the heating elements 6 when manually or remotely turning on.

The delay time of the element 11 is selected taking into account the response time of the switching device 4 and the passage of the signal through the threshold element 8 and is less than 1 s. The body 7 control current can be made in the form of a current transformer.

The trigger value of the operation of the temperature control units 1 and the humidity 2 of air is a design parameter and is chosen from the conditions for ensuring the normal operation of the electrical equipment of the switchgear switchgear.

Thus, the invention allows to significantly simplify the implementation of the device and improve reliability, since there is no need to install thermistors in each cell of the switchgear.

Claims (1)

Invention Formula A device for heating a complete switchgear with a control system containing heating elements, a power source, a switching device, air temperature and humidity control units, the outputs of which, respectively, through the first and second inputs of the first OR element are included in the switching device control circuit, the input of which is connected to the output power source, which differs in that, in order to increase its reliability by eliminating the control of the thermal floor in the zone of each heating element that, the current control authority, the threshold authority, the BANNER element, the DELAY element, the second OR element, the first and second inputs of which are connected respectively to the outputs of the first OR element and the switching device, are added, the output of the second element OR through the DELAY element is connected to the permissive input of the BAN element, prohibiting the entrance of which through the threshold organ is connected to the first output of the current control body, the second output of which connected to the inputs of the heating elements, the input of the current control unit is connected to the output of the switching device, the output of the BANGE element is included in the alarm circuit of the heating system malfunction. Editor I. Shulla Compiled by Yu.Postnikov Tehred L.Serdyukova Proofreader V.Girn to Recovery 49 Circulation 466 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and publishing plant Patent, Uzhgorod, st. Gagarin, 101 Subscription