CN210092862U - A temperature detection device capable of automatically cutting off a control loop and a circuit breaker - Google Patents

Abstract

The utility model discloses a temperature detection device capable of automatically cutting off a control circuit and a circuit breaker. The temperature detection device comprises a temperature sensing element PT and a relay KA, the relay KA comprises coil pins and at least one set of normally closed contacts and at least one set of normally open contacts, the coil pins can be connected to the control power supply, the normally closed contacts can be connected in series in the control circuit where the electrical drive elements in the high-voltage switchgear are located, and the normally open contacts are connected There is an alarm unit HL; the temperature sensing element PT is connected in series with the relay KA through a wire, and the temperature sensing element PT is arranged on one side of the high-voltage switchgear or the electrical drive element in the high-voltage switchgear and is used to detect the electrical drive element. At the current temperature, the temperature detection device can be used to solve the problem that the control loop cannot be mechanically cut off when the existing high-voltage switchgear such as a circuit breaker refuses to operate or the related components of the control loop are abnormal.

Description

A temperature detection device capable of automatically cutting off a control loop and a circuit breaker

technical field

The utility model particularly relates to a temperature detection device capable of automatically cutting off a control circuit and a circuit breaker.

Background technique

In the power system, circuit breakers, contactors and relays are some common high-voltage switchgear, which are used to control the opening and closing of the control circuit. In actual use, when the high-voltage switchgear is abnormal or refused to operate, the high-voltage switch will be The equipment is burned out or other electrical equipment in the circuit where the high voltage switchgear is located is burned out. Especially the circuit breaker, as one of the most important equipment in the distribution network substation, its safe and reliable operation plays a vital role in cutting off the fault current and ensuring the safe and reliable operation of the power grid. Among the 220kV and below circuit breakers, the failure phenomenon is very frequent, and the cause of the failure confirmed on site is mostly that the circuit breaker cannot operate normally due to the burning of the opening and closing coil; Expansion, causing large-scale power outages due to leapfrog opening, and even causing serious consequences such as burning of power equipment and fire, and when the integrity of the closing circuit is damaged, although the damage caused is smaller than the damage of the switching circuit integrity, but it also Therefore, when the circuit breaker refuses to operate or the related components of the control circuit are abnormal, the control circuit cannot be mechanically cut off, and the closing (opening) coil of the circuit breaker will continue to be charged. , the temperature of the coil rises rapidly. If it is not found in time, it will burn out, and even affect the normal operation of adjacent components. Based on the analysis of the above problems, the application provides a temperature detection device that can automatically cut off the control loop and the circuit breaker formed by it. device.

SUMMARY OF THE INVENTION

The purpose of the utility model is to provide a temperature detection device that can automatically cut off the control loop and the circuit breaker formed thereof, so as to solve the problem that the control loop cannot be mechanically cut off when the high-voltage switchgear such as the existing circuit breaker refuses to operate or the related components of the control loop are abnormal. The problem.

In order to solve the above problems, the present application provides a temperature detection device that can automatically cut off a control loop, comprising a temperature sensing element PT and a relay KA, the relay KA comprising coil pins, at least one set of normally closed contacts and at least one set of Normally open contacts, the coil pins can be connected to the control power supply, and the normally closed contacts can be connected in series in the control circuit where the electrical drive elements in the high-voltage switchgear are located, and the normally open contacts are connected to the alarm unit HL ; The temperature sensing element PT is connected in series with the relay KA through a wire, and the temperature sensing element PT is arranged on one side of the high-voltage switchgear or the electrical drive element in the high-voltage switchgear and is used to detect the current temperature of the electrical drive element.

As a preferred solution of the present application, the relay KA includes two groups of normally open contacts, one group of normally open contacts is connected to the alarm unit HL, and the other group of normally open contacts is connected in parallel to both ends of the temperature sensing element PT.

As a preferred solution of the present application, the alarm unit HL includes an alarm device, a single-chip microcomputer and a wireless signal transceiver module, and the alarm device and the wireless signal transceiver module are connected to the I/O pins of the single-chip microcomputer, and the single-chip microcomputer is preset with a Alarm information.

As a preferred solution of the present application, the temperature sensing element PT includes an NTC thermistor or a bimetal temperature switch.

In order to solve the above problems, the present application also provides a circuit breaker, which includes an opening coil and a closing coil, and is provided with a temperature detection device. The temperature detection device includes a temperature sensing element PT and a relay KA, and the relay KA includes coil pins. , at least one group of normally closed contacts and at least one group of normally open contacts, the coil pins are connected with a control power supply, and the normally closed contacts are connected in series in the opening coil circuit and/or the closing coil circuit; so The normally open contact is connected with an alarm unit HL; the temperature sensing element PT is connected in series with the relay KA through a wire, and is arranged on one side of the opening coil and/or the closing coil.

As a preferred solution of the present application, the relay KA includes two groups of normally open contacts, one group of normally open contacts is connected to the alarm unit HL, and the other group of normally open contacts is connected in parallel to both ends of the temperature sensing element PT.

As a preferred solution of the present application, the alarm unit HL includes an alarm device, a single-chip microcomputer and a wireless signal transceiver module, and the alarm device and the wireless signal transceiver module are connected to the I/O pins of the single-chip microcomputer, and the single-chip microcomputer is preset with a Alarm information.

As a preferred solution of the present application, the temperature sensing element PT includes an NTC thermistor or a bimetal temperature switch.

Compared with the prior art, the beneficial effects of the temperature detection device that can automatically cut off the control loop and the circuit breaker formed thereof in the present application include:

1) The opening and closing of the control loop is realized by detecting the temperature of the coil in the control loop, avoiding serious accidents and improving the reliability of power supply.

2) Maintenance personnel can make timely repairs according to the alarm information to shorten the power outage time.

3) Avoid burning out the coil, effectively reducing the cost of use and maintenance of high-voltage switchgear.

4) Simple operation and low cost of use.

reference number

PT is temperature sensing element, KA is relay, HL is alarm unit, KJL is contactor, LCL is closing coil, LTR is opening coil, SB1, SB2 are closing and opening buttons, SBT is transfer switch, S1 is auxiliary Switch, SPX is the energy storage normally closed contact.

Description of drawings

1 is a schematic diagram of a connection structure of components in a temperature detection device provided in Embodiment 1 of the present invention;

FIG. 2 is a schematic diagram of a connection structure of components in another temperature detection device provided by Embodiment 1 of the present invention;

Fig. 3 is the control module diagram of the alarm unit HL provided by the first embodiment of the present utility model;

4 is a circuit diagram of a temperature detection device comprising two sets of temperature sensing elements and a set of relays in the opening and closing circuits provided by the second embodiment of the present invention;

5 is a circuit diagram of the temperature detection device including two sets of temperature sensing elements and two sets of relays in the opening and closing circuits provided by the second embodiment of the present invention.

Detailed ways

Example 1:

This embodiment provides a temperature detection device that can automatically cut off a control loop. In this embodiment, the high-voltage switchgear includes any one of a relay, a circuit breaker, and a contactor, and the electrical drive element is provided in the relay, circuit breaker, and contactor. Opening and closing coils in the contactor.

Referring to FIG. 1, a schematic diagram of the connection structure of components in the high temperature detection device provided in this embodiment, the device includes a temperature sensing element PT and a relay KA, and the relay KA includes coil pins, at least one set of normally closed contacts and at least one set of normally closed contacts. The open contact, the coil pin can be connected to the control power supply. In this embodiment, the control power supply can be introduced from the outside or obtained from the control loop. The normally closed contact can be connected in series with the electrical drive element in the high-voltage switchgear. In the control circuit, the normally open contact is connected with the alarm unit HL; the temperature sensing element PT is connected in series with the relay KA through a wire, and the temperature sensing element PT is arranged on one side of the high-voltage switchgear or the electrical drive element in the high-voltage switchgear and used for Detects the current temperature of the electrical drive element.

Further, in this embodiment, the temperature sensing element PT includes an NTC thermistor or a bimetal temperature switch, preferably the NTC thermistor or the bimetal temperature switch is provided in the high-voltage switchgear or the electrical drive element in the high-voltage switchgear. One side and contact with the high-voltage switchgear or the electrical drive element in the high-voltage switchgear, the use of the NTC thermistor or bimetal temperature switch can ensure that the temperature detection device is in a disconnected or insulated state before the action; this embodiment preferably senses The temperature element PT is a bimetal temperature switch.

Further, in this embodiment, the alarm unit HL includes an alarm device, a single-chip microcomputer, and a wireless signal transceiver module. The alarm device and the wireless signal transceiver module are connected to the I/O pins of the single-chip microcomputer. The single-chip microcomputer is preset with alarm information. In the embodiment, the alarm information at least includes the circuit where the high-voltage switchgear is located or the location where the high-voltage switchgear is located. When in use, the alarm device sends an interrupt signal to the single-chip microcomputer at the same time as the sound and light alarm, and the single-chip microcomputer triggers the wireless signal after receiving the interrupt signal. The transceiver unit enters the high-frequency working mode, and the wireless signal transceiver unit remotely transmits the alarm information preset in the microcontroller to the monitoring terminal. The monitoring terminal can be a mobile terminal or a PC terminal. In this way, it is convenient for maintenance personnel to accurately locate and maintain in time. See FIG. 3 is a control module diagram of the alarm unit HL provided in this embodiment.

The temperature detection device in this embodiment is simple in structure and low in cost. The temperature detection device does not operate under the normal temperature of the electrical drive element in the high-voltage switchgear or high-voltage switchgear, and is in an insulating state. When the detected high-voltage switchgear or high-voltage switch When the temperature of the electric drive element in the equipment reaches the set temperature, the temperature sensing element PT will act. At this time, the action contact of the relay KA is pulled in, and the normally closed contact is disconnected to protect the control circuit. At the same time, the normally open contact Click to close to realize the alarm function.

In this embodiment, the relay KA includes a set of coil pins A1 and A2, a set of normally closed contacts 3 and 4 and a set of normally open contacts 5 and 6 to specifically describe how the temperature detection device is used:

Before using this embodiment, first connect the coil pins A1 and A2 of the temperature detection device to the control power supply in the control loop, the control power supply can be the positive and negative terminals in the high-voltage switchgear mechanism, and simultaneously connect the temperature detection device to the control power supply. The normally closed contacts 3 and 4 of the high-voltage switchgear are connected in series in the control circuit where the electrical drive element is located in the high-voltage switchgear, and finally the bimetal temperature switch is set on one side of the high-voltage switchgear or the electrical drive element in the high-voltage switchgear and contacts with each other , When in use, when the high-voltage switchgear refuses to move or the abnormal control loop causes the temperature of the electrical drive element in the high-voltage switchgear to rise, the bimetal temperature switch will sense the temperature change of the electrical drive element. When the temperature reaches the preset value, the bimetal temperature switch acts to energize the relay KA. After the relay KA is energized, the action contacts on it are closed. At the same time, the normally closed contacts 3 and 4 set in the control circuit are closed. Disconnect to realize the disconnection of the control loop, and the normally open contacts 5 and 6 connected with the alarm unit HL are closed to activate the alarm unit HL to send out an alarm signal and transmit the alarm information to the monitoring terminal. Therefore, the temperature detection in this embodiment is used. When the device senses the temperature change of the electrical drive components in the high-voltage switchgear in the control loop, it can disconnect the control loop in time, and send out an alarm signal and alarm information at the same time, which is convenient for maintenance personnel to find abnormalities in time, and can quickly keep the coil. Deal with hidden dangers, ensure the success rate of remote control operation, and ensure sustainable power supply. That is, even if the temperature detection device in this embodiment is used, the control loop can be cut off in time to avoid the existing control loop being unable to be mechanically cut off, resulting in long electrical drive elements in the high-voltage switchgear. The high-voltage switchgear and other electrical devices in the control circuit are burnt out due to the time being charged, which in turn leads to a power outage or a fire. When the circuit is cut off, an alarm signal and alarm information are issued to facilitate accurate positioning and timely maintenance by the staff. When the temperature of the electric drive element drops, the temperature detection device returns to the original state before the operation.

Further, in this embodiment, in order to achieve permanent blocking of the control loop, preferably the relay KA includes two groups of normally open contacts 5, 6 and 7, 8, and one group of normally open contacts 5, 6 is connected to the alarm unit HL. , another group of normally open contacts 7 and 8 are connected in parallel with both ends of the temperature sensing element PT, see Figure 2; when in use, when the temperature sensing element PT senses that the temperature of the electrical drive element in the high-voltage switchgear rises to a preset temperature value At the same time, the action contacts on the relay KA are pulled in, and at the same time, the normally open contacts 5, 6 and 7, 8 are also pulled in. Since the normally open contacts 7 and 8 are connected in parallel to both ends of the temperature sensing element PT, when The pull-in of the normally open contacts 7 and 8 will permanently disconnect the control circuit where the high-voltage switchgear is located.

Example 2:

This embodiment provides a circuit breaker, which includes an opening coil and a closing coil. The circuit breaker is provided with a temperature detection device. The temperature detection device includes a temperature sensing element PT and a relay KA. The relay KA includes coil pins, and at least one A set of normally closed contacts and at least one set of normally open contacts, and the coil pins are connected with a control power supply. In this embodiment, the control power supply can be introduced from the outside or obtained from the control loop. In this embodiment, the control power supply is preferably an open circuit. The positive and negative ends of the common terminal in the actuator mechanism, or the positive and negative ends of the opening and closing coils, the normally closed contacts are connected in series in the opening coil circuit and/or the closing coil circuit, and the normally open contacts are connected with an alarm The unit HL; the temperature sensing element PT is connected in series with the relay KA through a wire, and is arranged on one side of the opening coil and/or the closing coil.

In this embodiment, in order to control the opening circuit and the closing circuit respectively, preferably the temperature detection device includes a set of relays KA and two sets of temperature sensing elements PT1 and PT2, wherein the relay KA preferably includes two sets of normally closed contacts, according to According to actual needs, the relay KA can choose an intermediate relay. Referring to FIG. 4 , the circuit diagram of the temperature detection device including two sets of temperature sensing elements PT and one set of relay KA provided in this embodiment in the opening and closing circuit, in the circuit diagram, The contact A1 of the relay KA is connected to the positive end of the coil, and the contact A2 of the relay KA is connected to the negative end of the coil. In this embodiment, two sets of temperature sensing elements PT1 and PT2 are connected in parallel with the coil of the relay KA, and the two sets of the relay are normally closed. Contacts KA1 and KA2 are connected in series in the closing circuit and the opening circuit respectively. When in use, the two sets of temperature sensing elements PT1 and PT2 sense the temperature change of the closing coil and the opening coil respectively, and the temperature rise of the closing coil is sensed at PT1. When the temperature reaches the preset temperature, or when PT2 senses that the temperature of the opening coil rises to the preset temperature, the temperature sensing element PT1 or PT2 is closed and the coil of the relay KA is energized. The action contact is pulled in, the normally closed contacts KA1 and KA2 are disconnected and the opening and closing circuits are disconnected, and the normally open contact is closed to achieve an alarm.

Of course, in this embodiment, in order to control the opening circuit and the closing circuit respectively, preferably the temperature detection device may further include two groups of relays KA1 and KA2 and two groups of temperature sensing elements PT1 and PT2, wherein the relay KA1 and the temperature sensing element The element PT1 is set in the closing circuit, and the relays KA2 and PT2 are set in the opening circuit, see Figure 5.

Further, in this embodiment, the temperature sensing element PT includes an NTC thermistor or a bimetal temperature switch, preferably the NTC thermistor or the bimetal temperature switch is arranged on one side of the opening coil or the closing coil and In contact with the opening coil and/or the closing coil, the use of this NTC thermistor or bimetal temperature switch ensures that the temperature detection device is disconnected or insulated before action.

Further, in this embodiment, the alarm unit HL includes an alarm device, a single-chip microcomputer, and a wireless signal transceiver module. The alarm device and the wireless signal transceiver module are connected to the I/O pins of the single-chip microcomputer. The single-chip microcomputer is preset with alarm information. In the embodiment, the alarm information at least includes the circuit where the opening and closing coils are located or the position where the opening and closing coils are located. When in use, the alarm device sends an interrupt signal to the single-chip microcomputer while the sound and light alarm, and the single-chip microcomputer receives the interrupt signal. After triggering the wireless signal transceiver unit to enter the high-frequency working mode, the wireless signal transceiver unit remotely transmits the alarm information preset in the single-chip microcomputer to the monitoring terminal, which can be a mobile terminal or a PC terminal. Repair in time.

The temperature detection device in this embodiment is simple in structure, does not need a separate power supply, and uses a 110-220vDC/AC voltage signal as a control signal. Under the normal temperature of the opening and closing coils, the temperature detection device does not operate and is in an insulating state. . When the temperature of the closing coil reaches the set temperature, the temperature sensing element PT will act. At this time, the action contact of the relay KA is closed, and the normally closed contact is disconnected to protect the control circuit. At the same time, the normally open contact The circuit breaker is closed to realize the alarm function. Therefore, when the circuit breaker in this embodiment is used, when the opening and closing coils of the circuit breaker exceed the preset temperature, the control circuit can be cut off in time, and an alarm signal and alarm information can be sent at the same time, which is convenient for maintenance personnel to timely If an abnormality is found, the hidden danger can be quickly dealt with while the coil is kept, the success rate of the remote control operation is ensured, and the continuous power supply is ensured. That is, even if the circuit breaker in this embodiment is used, the control loop can be cut off in time to avoid the existing control loop that cannot be mechanically cut off. The circuit breaker and other electrical equipment in the control circuit are burnt due to the long-term electrification of the opening and closing coil, which in turn leads to a power failure or fire. When the circuit is cut off, an alarm signal and alarm information are issued to facilitate accurate positioning and timely maintenance by staff. When the temperature of the equal division and closing coils drops, the temperature detection device will return to the original state before the action.

Further, in this embodiment, in order to permanently block the control circuit where the circuit breaker is located, preferably the relay KA includes two groups of normally open contacts 5, 6 and 7, 8, and one group of normally open contacts 5, 6 is connected. There is an alarm unit HL, and another group of normally open contacts 7 and 8 are connected in parallel at both ends of the temperature sensing element PT; when in use, when the temperature sensing element PT senses that the temperature of the circuit breaker's opening coil or closing coil rises to a preset temperature When the value is activated, the relay KA is energized. After the relay KA is energized, the action contacts on the relay KA are pulled in. At the same time, the normally open contacts 5, 6 and 7 and 8 are also pulled in. Because the normally open contacts 7 and 8 are connected in parallel At both ends of the temperature sensing element PT, so when the normally open contacts 7 and 8 pull in, the opening and closing coil circuits will be permanently disconnected.

The above descriptions are only the embodiments of the present invention, and the common knowledge such as the well-known specific structures and characteristics in the solutions are not described too much here. It should be pointed out that for those skilled in the art, under the premise of not departing from the present utility model, several improvements can also be made, which should also be regarded as the protection scope of the present utility model, and these will not affect the implementation of the present utility model. effect and the applicability of the patent. The scope of protection claimed in this application should be based on the content of the claims. The specific implementation manner in the description can be used to interpret the content of the claims.

Claims (10)

1. The temperature detection device capable of automatically cutting off the control loop is characterized by comprising a temperature sensing element PT and a relay KA, wherein the relay KA comprises a coil pin, at least one group of normally closed contacts and at least one group of normally open contacts, the coil pin can be connected with a control power supply, the normally closed contacts can be connected in series in the control loop where an electric driving element in high-voltage switch equipment is located, and the normally open contacts are connected with an alarm unit HL; the temperature sensing element PT is connected with the relay KA in series through a lead, and is arranged on one side of the high-voltage switch equipment or an electric driving element in the high-voltage switch equipment and used for detecting the current temperature of the electric driving element.

2. The temperature detecting device capable of automatically cutting off the control loop according to claim 1, wherein the relay KA comprises two sets of normally open contacts, one set of normally open contacts is connected with the alarm unit HL, and the other set of normally open contacts is connected in parallel with two ends of the temperature sensing element PT.

3. The temperature detecting device capable of automatically cutting off the control loop according to claim 1 or 2, wherein the alarm unit HL comprises an alarm, a single chip microcomputer and a wireless signal transceiver module, the alarm and the wireless signal transceiver module are connected with an I/O pin of the single chip microcomputer, and alarm information is preset in the single chip microcomputer.

4. The apparatus for detecting temperature capable of automatically breaking a control loop according to claim 1 or 2, wherein the temperature sensing element PT comprises an NTC thermistor or a bimetal temperature switch.

5. The apparatus for detecting temperature of automatically breaking control loop according to claim 3, wherein said temperature sensing element PT comprises NTC thermistor or bimetal temperature switch.

6. A circuit breaker comprises a switching-off coil and a switching-on coil and is characterized in that a temperature detection device is arranged, the temperature detection device comprises a temperature sensing element PT and a relay KA, the relay KA comprises coil pins, at least one group of normally closed contacts and at least one group of normally open contacts, the coil pins are connected with a control power supply, and the normally closed contacts are connected in series in a switching-off coil loop and/or a switching-on coil loop; the normally open contact is connected with an alarm unit HL; the temperature sensing element PT is connected with the relay KA in series through a lead and is arranged on one side of the opening coil and/or the closing coil.

7. The circuit breaker according to claim 6, characterized in that the relay KA comprises two sets of normally open contacts, one set of normally open contacts is connected with the alarm unit HL, and the other set of normally open contacts is connected in parallel with two ends of the temperature sensing element PT.

8. The circuit breaker according to claim 6 or 7, characterized in that the alarm unit HL comprises an alarm, a single chip microcomputer and a wireless signal transceiver module, the alarm and the wireless signal transceiver module are connected with an I/O pin of the single chip microcomputer, and alarm information is preset in the single chip microcomputer.

9. The circuit breaker according to claim 6 or 7, characterized in that said temperature-sensitive element PT comprises an NTC thermistor or a bimetallic temperature switch.

10. The circuit breaker of claim 8, wherein the temperature sensing element PT comprises an NTC thermistor or a bimetal temperature switch.

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