CN110401172A - It is a kind of for the temperature-detecting device of element electrically driven in high-tension switch gear and its breaker of composition - Google Patents

Abstract

The invention discloses a temperature detection device for electrical drive components in high-voltage switchgear and a circuit breaker thereof. The temperature detection device includes a temperature sensing element PT and a relay KA. The relay KA includes coil pins, at least one set A normally closed contact 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 loop where the electrical drive elements in the high voltage switchgear are located. The 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 the temperature-sensing element PT is set on one side of the high-voltage switchgear or the electric drive element in the high-voltage switchgear and is used to detect The current temperature of the electric drive element can be used to solve the problem that the control circuit cannot be mechanically cut off when the existing circuit breaker and other high-voltage switchgears refuse to operate or the related components of the control circuit are abnormal.

Description

A temperature detection device for electrical drive components in high-voltage switchgear and its circuit breaker

technical field

In particular, the invention relates to a temperature detection device for electrical drive components in high-voltage switchgear and a circuit breaker formed thereof.

Background technique

In the power system, circuit breakers, contactors, and relays are some common high-voltage switchgears, which are used to control the opening and closing of the control circuit. In actual use, when the high-voltage switchgear is abnormal or refuses to operate, it will cause high-voltage The equipment is burned or other electrical equipment in the circuit where the high-voltage switchgear is located is burned. 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. The operation and maintenance process of the power station within the jurisdiction of the company Among them, the failure phenomenon of 220kV and below circuit breakers is very frequent. The cause of the failure confirmed on site is mostly the burning of the opening and closing coils, which leads to the failure of the circuit breaker to operate normally; Expansion, resulting in large-scale power outages, and even serious consequences such as burning of electrical equipment and fires. When the integrity of the closing circuit is damaged, although the damage caused is less than that of the integrity of the switching circuit, it is also Therefore, when the circuit breaker refuses to move or the related components of the control circuit are abnormal, the control circuit cannot be cut off mechanically, 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 it out, and even affect the normal operation of adjacent components. Based on the analysis of the above problems, this application provides a temperature detection device for electrical drive components in high-voltage switchgear. It constitutes a circuit breaker.

Contents of the invention

The purpose of the present invention is to provide a temperature detection device for electrical drive components in high-voltage switchgear and the circuit breaker it constitutes, to solve the problem of failure of the control circuit when the high-voltage switchgear such as the existing circuit breaker refuses to operate or the related components of the control circuit are abnormal. The problem of being cut off mechanically.

In order to solve the above problems, the application provides a temperature detection device for electrical drive components in high-voltage switchgear, including a temperature sensing element PT and a relay KA, the relay KA includes a coil pin, 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, 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 electric drive element in the high-voltage switchgear and is used to detect the electrical drive element Current Temperature.

As a preferred solution of the present application, the relay KA includes two sets of normally open contacts, one set of normally open contacts is connected to the alarm unit HL, and the other set 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, a single-chip microcomputer and a wireless signal transceiver module, and the alarm 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 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 with high temperature protection function, 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. The relay KA includes coil pins, at least one set of normally closed contacts and at least one set of normally open contacts, the coil pins are connected to a control power supply, and the normally closed contacts are connected in series to the opening coil circuit and/or closing In the coil circuit; the normally open contact is connected to 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 sets of normally open contacts, one set of normally open contacts is connected to the alarm unit HL, and the other set 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, a single-chip microcomputer and a wireless signal transceiver module, and the alarm 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 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 for electrical drive components in high-voltage switchgear and the circuit breaker it constitutes in this application include:

1) By detecting the temperature of the coil in the control loop, the control loop is disconnected and closed to avoid serious accidents and improve the reliability of power supply.

2) The maintenance personnel can make repairs in time according to the alarm information to shorten the power outage time.

3) Prevent the coil from being burned out, and effectively reduce the use cost and maintenance cost of the high-voltage switchgear.

4) Simple operation and low cost of use.

reference sign

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

Description of drawings

Fig. 1 is a schematic diagram of the component connection structure in a temperature detection device provided by Embodiment 1 of the present invention;

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

Fig. 3 is a control block diagram of the alarm unit HL provided by Embodiment 1 of the present invention;

Fig. 4 is a circuit diagram of a temperature detecting device comprising two sets of temperature sensing elements and a set of relays in the opening and closing circuits provided by Embodiment 2 of the present invention;

Fig. 5 is a circuit diagram of the temperature detecting device comprising 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 for electrical drive components in high-voltage switchgear. In this embodiment, the high-voltage switchgear includes any one of relays, circuit breakers and contactors. , Opening and closing coils in circuit breakers and contactors.

Referring to Figure 1, it is a schematic diagram of the connection structure of components in the high temperature detection device provided by this embodiment. The device includes a temperature sensing element PT and a relay KA. The relay KA includes a coil pin, at least one set of normally closed contacts and at least one set of normally closed contacts. Open contacts, the coil pins can be connected to the control power supply, in this embodiment, the control power supply can be introduced from the outside, or can be obtained in the control circuit, the normally closed contacts can be connected in series in the high voltage switchgear where the electrical drive components are located In the control circuit, the normally open contact is 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 set 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 electrical drive components.

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 in the high-voltage switchgear or the electrical drive element in the high-voltage switchgear One side of the high-voltage switchgear or the electrical drive element in the high-voltage switchgear is in contact. The NTC thermistor or the 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, a single-chip microcomputer and a wireless signal transceiver module, and the alarm and the wireless signal transceiver module are connected to the I/O pins of the single-chip microcomputer, and alarm information is preset in the single-chip microcomputer. In the embodiment, the alarm information includes at least 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 while 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 sends 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 perform timely maintenance. See Fig. 3 is a control block diagram of the alarm unit HL provided by 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 electric drive element in the high-voltage switchgear or the high-voltage switchgear, and is in an insulating state. When the detected high-voltage switchgear or high-voltage switchgear When the temperature of the electrical 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 closed, and the normally closed contact is disconnected to protect the control circuit. At the same time, the normally open contact The point closure realizes the alarm function.

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

Before this embodiment is used, first connect the coil pins A1 and A2 in the temperature detection device to the control power supply in the control circuit. 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 each other , when in use, when the high-voltage switchgear refuses to move or the abnormal control circuit 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 at this time. When the temperature reaches the preset value, the bimetal temperature switch acts to power on the relay KA, and the action contacts on the relay KA are closed after power on. At the same time, the normally closed contacts 3 and 4 set in the control circuit Disconnect to realize the disconnection of the control loop, and the normally open contacts 5 and 6 connected to the alarm unit HL are closed to start the alarm unit HL to send an alarm signal and transmit the alarm information to the monitoring terminal. Therefore, using the temperature detection in this embodiment When the device perceives 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 alarm signals and alarm information at the same time, which is convenient for maintenance personnel to find abnormalities in time and quickly Deal with hidden dangers, ensure the success rate of remote control operation, and ensure sustainable power supply. That is, the temperature detection device in this embodiment can cut off the control loop in time to avoid the failure of the existing control loop to be mechanically cut off, resulting in long-term electrical drive components in the high-voltage switchgear. The high-voltage switchgear and other electrical equipment in the control circuit will be burned for a long time, which will lead to power outage or fire. When the temperature of the electrical drive components in the equipment drops, the temperature detection device returns to the original state before the action.

Further, in this embodiment, in order to achieve permanent locking of the control loop, preferably the relay KA includes two sets of normally open contacts 5, 6 and 7, 8, and one set 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 at both ends of the temperature sensing element PT, see Figure 2; when in use, when the temperature sensing element PT senses the temperature of the electrical drive element in the high voltage switchgear rises to the preset temperature value The time action makes the action contacts on the relay KA pull in, and at the same time the normally open contacts 5, 6 and 7, 8 also pull in, because the normally open contacts 7, 8 are connected in parallel at both ends of the temperature sensing element PT, so when The pull-in of 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 with high temperature protection function, 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 a coil Pins, at least one set of normally closed contacts and at least one set of normally open contacts, the coil pins are connected to the control power supply. In this embodiment, the control power supply can be introduced from the outside or obtained in the control loop. In this embodiment Preferably, the control power supply is the positive and negative terminals of the common wiring terminal in the circuit breaker mechanism, or the positive and negative terminals 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, normally open The 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.

In this embodiment, in order to control the opening circuit and the closing circuit respectively, the temperature detection device preferably 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. See Figure 4, which is a circuit diagram of a temperature detection device in the opening and closing circuit that includes two sets of temperature sensing elements PT and a set of relays KA provided by this embodiment. In this 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, the two sets of temperature sensing elements PT1 and PT2 are connected in parallel and connected in series with the coil of the relay KA, and the two sets of the relay are normally closed. The contacts KA1 and KA2 are respectively connected in series in the closing circuit and the opening circuit. When in use, two sets of temperature sensing elements PT1 and PT2 sense the temperature change of the closing coil and the opening coil respectively, and PT1 senses the temperature rise of the closing coil. 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 will be closed and the coil of the relay KA will be powered on, and the coil on the relay KA will be powered on. The action contacts are closed, the normally closed contacts KA1 and KA2 are disconnected, and then the opening and closing circuits are disconnected, and the normally open contacts are closed to realize the alarm.

Of course, in this embodiment, in order to control the opening circuit and the closing circuit respectively, it is preferable that the temperature detection device can also include two sets of relays KA1, KA2 and two sets of temperature sensing elements PT1 and PT2, wherein the relay KA1 and the temperature sensing Component PT1 is set in the closing circuit, and relays KA2 and PT2 are set in the opening circuit, see FIG. 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 closing coil, the NTC thermistor or bimetal temperature switch can ensure that the temperature detection device is in a disconnected or insulated state before action.

Further, in this embodiment, the alarm unit HL includes an alarm, a single-chip microcomputer and a wireless signal transceiver module, and the alarm and the wireless signal transceiver module are connected to the I/O pins of the single-chip microcomputer, and alarm information is preset in the single-chip microcomputer. In the embodiment, the alarm information includes at least the circuit where the opening and closing coils are located or the positions where the opening and closing coils are 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 receives the interruption signal. After triggering the wireless signal transceiver unit to enter the high-frequency working mode, the wireless signal transceiver unit will remotely send the alarm information preset in the microcontroller to the monitoring terminal. The monitoring terminal can be a mobile terminal or a PC terminal, so that it is convenient for maintenance personnel to locate accurately. Repair in time.

The temperature detection device in this embodiment is simple in structure, does not need a separate power supply, and uses the 110-220vDC/AC voltage signal as the control signal. The temperature detection device does not operate at the normal temperature of the opening and closing coils, and is in an insulating state. 1. When the temperature of the closing coil reaches the set temperature, the temperature sensing element PT acts. 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 Closing realizes the alarm function. Therefore, using the circuit breaker in this embodiment, 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 are sent at the same time, which is convenient for maintenance personnel to timely When an abnormality is found, the hidden danger can be quickly dealt with while keeping the coil, so as to ensure the success rate of remote control operation and sustainable power supply. That is to say, the circuit breaker in this embodiment can cut off the control loop in time to prevent the existing control loop from being mechanically cut off The circuit breaker and other electrical equipment in the control circuit will be burned if the opening and closing coil is charged for a long time, which will lead to power failure or fire. When the circuit is cut off, an alarm signal and alarm information will be sent out to facilitate accurate positioning and timely maintenance of the staff. When the temperature of the equalizing 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 lock the control circuit where the circuit breaker is located, preferably the relay KA includes two sets of normally open contacts 5, 6 and 7, 8, and a set of normally open contacts 5, 6 are 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 opening coil or closing coil rises to the preset temperature When the value is active, the relay KA is powered on. After the relay KA is powered on, the action contacts on it are closed, and at the same time the normally open contacts 5, 6 and 7, 8 are also closed. At the two ends of the temperature sensing element PT, when the normally open contacts 7 and 8 are pulled in, the split and close coil circuits will be permanently disconnected.

What is described above is only an embodiment of the present invention, and the common knowledge such as the specific structure and characteristics known in the solution is not described here too much. It should be pointed out that for those skilled in the art, without departing from the premise of the present invention, some improvements can also be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the effect and effect of the implementation of the present invention. Patent utility. The scope of protection claimed in this application shall be based on the content of the claims. The specific implementation methods and other records in the description may be used to interpret the contents of the claims.

Claims (10)

1. A temperature detection device for electrical drive components in high-voltage switchgear, characterized in that it includes a temperature sensing element PT and a relay KA, and the relay KA includes a coil pin, at least one group of normally closed contacts and at least one A group 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 components in the high voltage switchgear are located, and the normally open contacts are connected to 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 electric drive element in the high-voltage switchgear and used to detect the current temperature of the electric drive element. 2. The temperature detection device for electrical drive components in high-voltage switchgear as claimed in claim 1, wherein said relay KA comprises two sets of normally open contacts, and one set of normally open contacts is connected with an alarm unit HL , another set of normally open contacts are connected in parallel at both ends of the temperature sensing element PT. 3. as claimed in claim 1 or 2, be used for the temperature detecting device of electrical drive element in the high-voltage switchgear, it is characterized in that, described alarm unit HL comprises alarm, single-chip microcomputer and wireless signal transceiving module, alarm and wireless signal The transceiver module is connected to the I/O pin of the single-chip microcomputer, and alarm information is preset in the single-chip microcomputer. 4. The temperature detection device for electrical drive components in high-voltage switchgear according to claim 1 or 2, wherein the temperature sensing element PT includes an NTC thermistor or a bimetal temperature switch. 5 . The temperature detection device for electrical drive components in high voltage switchgear according to claim 3 , wherein the temperature sensing element PT comprises an NTC thermistor or a bimetal temperature switch. 5 . 6. A circuit breaker with high temperature protection function, comprising an opening coil and a closing coil, characterized in that it 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 a coil lead Pins, at least one set of normally closed contacts and at least one set of normally open contacts, the coil pins are connected to control power, and the normally closed contacts are connected in series in the opening coil circuit and/or closing coil circuit; The normally open contact is connected to 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. 7. The circuit breaker with high temperature protection function as claimed in claim 6, characterized in that, said relay KA comprises two sets of normally open contacts, one set of normally open contacts is connected with alarm unit HL, the other set of normally open contacts The contacts are connected in parallel at both ends of the temperature sensing element PT. 8. The circuit breaker with high temperature protection function as claimed in claim 6 or 7, wherein the alarm unit HL comprises an alarm, a single-chip microcomputer and a wireless signal transceiver module, and the alarm and the wireless signal transceiver module are connected with the single-chip microcomputer The I/O pin of the device is connected, and the alarm information is preset in the single-chip microcomputer. 9. The circuit breaker with high temperature protection function according to claim 6 or 7, characterized in that the temperature sensing element PT comprises an NTC thermistor or a bimetal temperature switch. 10 . The circuit breaker with high temperature protection function according to claim 8 , wherein the temperature sensing element PT comprises an NTC thermistor or a bimetal temperature switch. 11 .