RU48104U1 - CIRCUIT BREAKER WITH PROTECTION AGAINST SUPPLY - Google Patents

Abstract

The utility model relates to electrical engineering, namely, devices for protection against overvoltage in the network. A circuit breaker with overvoltage protection contains movable and fixed contacts, an electromagnetic short-circuit protection element, a thermal overload protection element and an input voltage monitoring unit as part of a threshold voltage element connected in series with the input voltage divider and the key control electrode, kinematically associated with the coil of the electromagnetic drive of the release (trip mechanism), while the input voltage control unit has an additional electrical circuit with a closing element parallel to the threshold voltage element, which allows us to verify the operability of the voltage control unit of the circuit breaker without the need to dismantle the device and install it on a special stand.

Description

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Circuit breaker with overvoltage protection.

The utility model relates to electrical engineering, namely, devices for protection against overvoltage in the network.

Known circuit breaker containing elements of electromagnetic protection against short circuit and thermal protection element against overload currents,

fixed and mobile power ^ contacts and disconnection mechanism (see JC ^^ JI ^^^^^ W ^^ M ^^ W ^ lCi ^ Z ^ U ^ ^ bC ^ w ^

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'' This circuit breaker does not protect the devices connected to the network from sudden voltage surges in the network. Closest to the proposed technical solution is a circuit breaker containing movable and fixed contacts, an element of electromagnetic protection against short circuit, a thermal element of protection against overload currents, an input voltage control unit as part of a threshold voltage element connected in series with the input voltage divider and a key control electrode and in parallel with the coil of the electromagnetic drive of the release (trip mechanism) (see St. for utility model of Russia No. 16412, HOI H 81 / 00, publ. 12.05.2000).

This device in working condition allows you to protect devices connected to the network at emergency values of the mains voltage. However, this device is not equipped with an indicator of its operability and in the event of its failure, the consumer cannot timely determine the need for its repair and replacement, which can cause the equipment and devices protected by this device to stand out. Checking its performance is carried out at special stands, which is inconvenient and expensive.

The task of creating a real utility model is to create the ability to test the performance of a circuit breaker with protection against excess mains voltage in place (at the consumer).

The technical result of the proposed utility model is ease of use due to the possibility of timely replacement of a failed

circuit breaker and prevent the failure of electrical appliances and equipment included in the network.

The specified technical result is achieved due to the fact that in the well-known circuit breaker with overvoltage protection containing movable and fixed contacts, an electromagnetic short-circuit protection element, a thermal protection element against overload currents and an input voltage control unit as part of a threshold voltage element, connected in series with the input voltage divider and the key control electrode, kinematically connected with the coil of the electromagnetic drive Ithel (tripping mechanism), there are differences, namely the input voltage control unit has a second electric circuit with the closing element, the parallel voltage threshold element.

In FIG. 1 shows a block diagram of a circuit breaker with overvoltage protection.

In FIG. 2 shows the electrical circuit of the input voltage control unit.

The circuit breaker (AB) (see Fig. 1) contains: an element of electromagnetic protection against short circuit current 1, a thermal element of protection against overload currents 2, a fixed power contact 3, a movable power contact 4, a trip mechanism 5 (release) and a control unit input voltage 6.

The input voltage control unit 6 (see Fig. 2) consists of an input voltage divider 7, in the form of two resistances R) and Rz, connected in parallel with each other, a threshold element 8 connected in series with the input voltage divider 7 and the control electrode 9 of the key 10 The key 10 is connected in series with the coil of the electromagnetic drive of the release 1 \\ Parallel to the threshold voltage element 8. In AB there is an electric circuit 12 with a closing element 13 in the form of a button.

The circuit breaker operates as follows. In the event of a short circuit or overload currents, the signal from the electromagnetic protection elements 1 or the thermal protection element 2 is supplied to the electromagnetic drive of the release 11, which leads to the opening of the power contacts 3 and 4.

In the case of normal operation of voltage control unit 6 with open circuit 12 (button 13 is inoperative) and when voltage is applied to input AB, input voltage 7 reduced by the divider is supplied to threshold element 8. If this voltage is normal, threshold element 8 is closed, and the shutdown signal is not supplied to the control electrode 9 of the key 10, then the signal from the voltage monitoring unit 6 to open the power contacts 3 and 4 is not received. In the case of excess voltage in the network, the threshold element 8 opens, and the trip signal is supplied to the control electrode 9 of the key 10 and to the coil of the electromagnetic drive # of the trip unit 11 (trip mechanism) and contacts 3 and 4 are opened.

To check on-site the operability of voltage control unit 6, circuit 12 is closed with the help of a closing element - buttons 13, and thereby, a bypass circuit is created to supply voltage to the control electrode 9 of key 10, and to open the power contacts 3 and 4.

Thus, the introduction of an additional electrical circuit with a closing element installed in the input voltage control unit parallel to the threshold voltage element allows you to simulate an excess or surge in the mains voltage and make sure that the voltage control unit of the circuit breaker is operational without having to dismantle the device and install it on a special stand.

Claims (1)

A circuit breaker with protection against overvoltage of the mains voltage, containing movable and fixed contacts, elements of electromagnetic protection against short circuit, thermal element of protection against overload currents and an input voltage control unit as part of a threshold voltage element connected in series with the input voltage divider and the key control electrode, kinematically connected with the coil of the electromagnetic drive of the release (trip mechanism), characterized in that the input control unit yazheniya has a second electric circuit with the closing element, the parallel voltage threshold element.