State prompting device of heater and heating system of electrical equipment

Abstract

The invention discloses a state prompting device of a heater and a heating system of electrical equipment, the device comprises an overcurrent relay, an electromagnet and a handheld indicator, the overcurrent relay is connected with a power supply line of the heater to monitor power supply current of the heater, a first access end of the electromagnet is connected with a null line of a power supply, and a second access end of the electromagnet is connected with a null line of the power supply; a second access end of the electromagnet is connected with a live wire of the power supply through a normally open contact of the current relay, and when the overcurrent relay monitors that the heater obtains the power supply current, the normally open contact is conducted, so that the electromagnet is electrified and generates a magnetic field; the handheld indicator comprises a magnetic control switch, an indicator power supply and an indicator lamp; the magnetic control switch is switched on when in the magnetic field, so that the magnetic control switch, the indicator power supply and the indicator lamp form a power-on loop, and the indicator lamp emits light; under the condition that the electromagnet generates a magnetic field, when the handheld indicator is close to the electromagnet, the indicator light emits light. According to the technical scheme, the working state of the heater can be quickly and accurately determined.

Description

Technical Field

[0001] The invention relates to the technical field of power system transformation, and in particular to a state prompting device for a heater and a heating system for power equipment. Background Art

[0002] As the demand for electricity in the whole society is getting higher and higher, the monitoring ability of the power system is becoming more and more important. Among them, the substation is an important part of the power system. Most of the power equipment in the substation is installed outdoors. In order to ensure the normal operation of these power equipment in winter, heaters and corresponding temperature control systems are installed in the boxes (cabinets) where the power equipment is located, such as circuit breaker mechanism boxes, disconnector mechanism boxes, terminal boxes, control cabinets, etc. When the temperature in the box where the power equipment is located is lower than the set value, the heater starts to ensure that the power equipment is in a suitable ambient temperature.

[0003] When the power system is running, the operation and maintenance personnel need to regularly check the working status of the heater. There are currently three commonly used inspection schemes. The first is to open the door of the box (cabinet) where the power equipment is located and touch the heater with your hand to see if it is hot. However, this method is neither convenient nor safe. The second is to use an infrared thermal imager to observe the temperature of the heater, but this method is greatly affected by environmental factors and is not accurate enough. The third is to judge the status of the heater through the indicator light signal, but this method is not suitable for boxes (cabinets) without observation windows. Therefore, the current inspection scheme for the working status of the heater cannot quickly and accurately determine the working status of the heater. Summary of the invention

[0004] In view of this, the present application provides a heater status prompt device and a heating system for electric equipment, the main purpose of which is to solve the technical problem of being unable to quickly and accurately determine the working status of the heater.

[0005] According to a first aspect of the present invention, a heater status prompting device is provided, which is applied to a substation, and the heater status prompting device comprises:

[0006] an overcurrent relay, wherein a current monitoring terminal of the overcurrent relay is connected to a power supply line of a heater of an electric power device in the substation to monitor a power supply current obtained by the heater from the power supply line;

[0007] An electromagnet, wherein a first access end of the electromagnet is connected to a neutral line drawn from an external power supply, a second access end of the electromagnet is connected to a first end of a normally open contact of the overcurrent relay, and a second end of the normally open contact is connected to a live line drawn from the power supply,

[0008] When the overcurrent relay detects that the current value of the power supply current obtained by the heater is greater than or equal to the preset current value, the normally open contact of the overcurrent relay is turned on to enable the electromagnet to be energized and generate a magnetic field;

[0009] The state prompting device of the heater further comprises:

[0010] A handheld indicator, comprising a magnetically controlled switch, an indicator power supply and an indicator light connected in series, wherein the magnetically controlled switch is turned on when in a magnetic field;

[0011] When the electromagnet is energized and generates a magnetic field, when the handheld indicator approaches the electromagnet, a series circuit consisting of the magnetic switch, the indicator power supply and the indicator light is turned on, causing the indicator light to emit light.

[0012] Optionally, the status prompting device of the heater further includes: a light prompter, which is connected in series with the electromagnet so that when the normally open contact is turned on, the light prompter emits a light prompting message.

[0013] Optionally, the status prompt device of the heater and the power equipment are arranged in the shell, and the status prompt device of the heater also includes a buzzer, which is connected in series with the electromagnet so that when the normally open contact is turned on, the buzzer emits a sound prompt information.

[0014] Optionally, the magnetically controlled switch is a Hall effect switch.

[0015] Optionally, the status prompt device of the heater and the power equipment are arranged in a shell, and a detection point mark is provided at a preset position on the outer surface of the shell; the electromagnet is arranged on the inner side surface of the shell at the position of the detection point mark.

[0016] Optionally, the overcurrent relay includes: a through-type current transformer, wherein the power supply line of the heater passes through the primary side coil of the through-type current transformer, so that when the heater is energized through the power supply line, the secondary side coil of the through-type current transformer generates current; a current relay, wherein the relay coil of the current relay is connected to the secondary side coil, and the normally open contact of the current relay is connected in series between the second access end of the electromagnet and the live wire of the power supply, so that when the secondary side coil generates current, the normally open contact of the current relay is in a conducting state, and the electromagnet is energized to generate a magnetic field.

[0017] According to a second aspect of the present invention, there is provided a heating system for electric equipment, the heating system for electric equipment comprising the above-mentioned heater status prompting device;

[0018] The heating system of the electric power equipment also includes:

[0019] A temperature and humidity sensor is disposed at the electric power equipment and is used to collect temperature information at the location of the electric power equipment;

[0020] A thermostat, the thermostat being connected to the temperature and humidity sensor to receive the temperature information;

[0021] A heater, the heater is arranged at the power device, and the heater is connected to the power supply terminal of the thermostat through a power supply line to obtain the power supply current required for the operation of the heater;

[0022] The thermostat is configured to perform the following processing:

[0023] Comparing the temperature information with a preset temperature threshold to determine whether the temperature information is less than the temperature threshold;

[0024] If the temperature information is less than the temperature threshold, power is supplied to the heater through the power supply line to put the heater into working state.

[0025] Optionally, the temperature and humidity sensor is also used to collect the humidity value of the location of the electrical equipment and send the humidity value to the thermostat; the thermostat is also configured to perform the following processing: compare the humidity value with a preset humidity value threshold to determine whether the humidity value is greater than or equal to the humidity value threshold; if the humidity value is greater than or equal to the humidity value threshold, power the heater through the power supply line to put the heater in a working state.

[0026] Optionally, the heating system of the electrical equipment also includes: a power supply, wherein the live wire end of the power supply is connected to the live wire receiving end of the overcurrent relay, and the neutral wire end of the power supply is connected to the neutral wire receiving end of the overcurrent relay to provide working power to the overcurrent relay; the live wire end of the power supply is also connected to the second end of the normally open contact of the overcurrent relay, and the neutral wire end of the power supply is also connected to the first access end of the electromagnet.

[0027] Optionally, the live wire end of the power supply is also connected to the first power access terminal of the thermostat, and the neutral wire end of the power supply is also connected to the second power access terminal of the thermostat to provide working power for the thermostat; the power access terminal of the temperature and humidity sensor is connected to the power output terminal of the thermostat to obtain working power from the thermostat.

[0028] The present invention provides a state prompt device for a heater and a heating system for an electric device. When the heater of the electric device obtains power from a power supply line and starts heating, the overcurrent relay detects that the current in the power supply line meets the preset requirements, and turns on the normally open contact of the overcurrent relay, so that a conductive loop is formed between the electromagnet, the neutral line drawn from the power supply, and the live line drawn from the power supply, so that the electromagnet generates a magnetic field. Further, when the inspector holds a handheld indicator close to the electromagnet, the magnetic field generated by the electromagnet turns on the magnetic control switch, and the series circuit composed of the magnetic control switch, the indicator power supply, and the indicator light is turned on, so that the indicator light is illuminated. At this time, the inspector can judge that the heater is working normally; on the contrary, if the heater does not obtain the working current from the power supply line, the normally open contact of the overcurrent relay is disconnected, so that the electromagnet cannot be energized to generate a magnetic field. When the inspector holds a handheld indicator close to the electromagnet, the magnetic control switch, the indicator power supply, and the indicator light cannot form a series circuit, so that the indicator light does not light up. At this time, the inspector can judge that the heater is not in a working state, so that the inspector can quickly and accurately determine the working state of the heater.

[0029] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0031] Figure 1 One of the structural schematic diagrams of a heater status prompt device provided by an embodiment of the present invention is shown;

[0032] Figure 2 A schematic diagram showing the connection between an overcurrent relay and a power supply line provided by an embodiment of the present invention is shown;

[0033] Figure 3 A second structural schematic diagram of a heater status prompt device provided by an embodiment of the present invention is shown;

[0034] Figure 4 A schematic structural diagram of a heating system for electric power equipment provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0036] As the demand for electricity in the whole society is getting higher and higher, the monitoring ability of the power system is becoming more and more important. Among them, the substation is an important part of the power system. Most of the power equipment in the substation is installed outdoors. In order to ensure that these power equipment can operate normally in winter, heaters and corresponding temperature control systems are installed in the boxes (cabinets) where the power equipment is located, such as circuit breaker mechanism boxes, disconnector mechanism boxes, terminal boxes, and control cabinets. When the temperature in the box where the power equipment is located is lower than the set value, the heater is started to ensure that the power equipment is in a suitable ambient temperature. At the same time, the operation and maintenance personnel need to check the working status of the heater regularly. There are currently three commonly used inspection schemes. The first is to open the box (cabinet) door where the power equipment is located and touch the heater with your hand to see if it is hot. However, this method is neither convenient nor safe; the second is to use an infrared thermal imager to observe the temperature of the heater, but this method is greatly affected by environmental factors and is not accurate enough; the third is to judge the status of the heater by the indicator light signal, but this method is not suitable for boxes (cabinets) without observation windows. Therefore, the current inspection scheme for the working status of the heater cannot quickly and accurately determine the working status of the heater.

[0037] In view of the above problems, in one embodiment, Figure 1 As shown, a heater status prompt device is provided, which is explained by taking the application of the device in a substation as an example. The device includes an overcurrent relay 100, an electromagnet 200 and a handheld indicator 500, wherein the working voltage of the selected electromagnet 200 is 220V, and it can be energized for a long time. It is connected to the load side of the overcurrent relay 100. When the heater 300 is working, the overcurrent relay 100 is actuated, and the electromagnet 200 is energized to generate a magnetic field.

[0038] Specifically, the current monitoring end of the overcurrent relay 100 is connected to the power supply line 400 of the heater 300 of the power equipment in the substation to monitor the power supply current obtained by the heater 300 from the power supply line 400. Furthermore, the overcurrent relay 100 has a built-in through-core current transformer (not shown in the figure), so it will not affect the circuit of the heater. Figure 2 As shown, the current monitoring end of the overcurrent relay 100 includes a first sub-current monitoring end B1 and a second sub-current monitoring end B2. The power supply line 400 is connected to the overcurrent relay 100 from the first sub-current monitoring end B1. After the overcurrent relay 100 detects the current in the power supply line 400, the power supply line 400 is led out from the second sub-current monitoring end B2 to supply power to the heater (not shown in the figure).

[0039] Further, such as Figure 1 As shown, the first access end of the electromagnet 200 is connected to the neutral line N led out of the external power supply E, the second access end of the electromagnet 200 is connected to the first end of the normally open contact of the overcurrent relay 100, and the second end of the normally open contact is connected to the live line L led out of the power supply E. Among them, the first access end of the electromagnet 200 can be the first power connection end of the electromagnet, and the second access end of the electromagnet 200 can be the second power connection end of the electromagnet, and the first power connection end and the second power connection end jointly receive alternating current to power the electromagnet 200. Further, when the overcurrent relay 100 detects that the current value of the power supply current obtained by the heater 300 is greater than or equal to the preset current value, the normally open contact of the overcurrent relay 100 is turned on, so that the electromagnet 200 is energized and generates a magnetic field. Here, the preset current value can be 0.8-1.0 times the rated current of the heater 300, and its specific current value can be determined according to actual conditions.

[0040] Furthermore, the handheld indicator 500 includes a magnetically controlled switch 530, an indicator power supply 510 and an indicator light 520 connected in series, wherein the magnetically controlled switch 530 is turned on when in a magnetic field; here, the magnetically controlled switch 530 can be a Hall element such as a Hall effect switch.

[0041] Furthermore, when the electromagnet 200 is powered and generates a magnetic field, when the handheld indicator 500 approaches the electromagnet 200, the series circuit formed by the magnetic switch 530, the indicator power supply 510 and the indicator light 520 is turned on, so that the indicator light 520 emits light. In the actual working process, the inspector holds the handheld indicator 500 close to the detection point where the electromagnet 200 is located. When there is a magnetic field at the detection point, the Hall effect switch in the handheld indicator 500 is turned on, and the indicator light 520 is on, indicating that there is current in the circuit of the heater 300 and the heater 300 is working; when the indicator light 520 is not on, it indicates that there is no current in the circuit of the heater 300 and the heater 300 is not working.

[0042] Here, the overcurrent relay 100 may include a through-type current transformer (not shown in the figure) and a current relay (not shown in the figure); specifically, the power supply line of the heater passes through the primary side coil of the through-type current transformer, so that when the heater is energized through the power supply line, the secondary side coil of the through-type current transformer generates current; further, the relay coil of the current relay is connected to the secondary side coil, and the normally open contact of the current relay is connected in series between the second access end of the electromagnet and the live wire of the power supply, so that when the secondary side coil generates current, the normally open contact of the current relay is in a conducting state, and the electromagnet is energized to generate a magnetic field.

[0043] The state prompt device of the heater provided in this embodiment, when the heater of the electric equipment obtains power from the power supply line and starts heating, the overcurrent relay detects that the current in the power supply line meets the preset requirements, and turns on the normally open contact of the overcurrent relay, so that a conductive loop is formed between the electromagnet, the neutral line drawn from the power supply, and the live line drawn from the power supply, so that the electromagnet generates a magnetic field. Further, when the inspector holds the handheld indicator close to the electromagnet, the magnetic field generated by the electromagnet turns on the magnetic control switch, and the series circuit composed of the magnetic control switch, the indicator power supply and the indicator light is turned on, so that the indicator light is illuminated, at this time, the inspector can judge that the heater is working normally; on the contrary, if the heater does not obtain the working current from the power supply line, the normally open contact of the overcurrent relay is disconnected, so that the electromagnet cannot be energized to generate a magnetic field, and when the inspector holds the handheld indicator close to the electromagnet, the magnetic control switch, the indicator power supply and the indicator light cannot form a series circuit, so that the indicator light does not light up, at this time, the inspector can judge that the heater is not in working state, so that the inspector can quickly and accurately determine the working state of the heater.

[0044] In one embodiment, the device further comprises a light prompter, which is connected in series with the electromagnet so that when the normally open contact is turned on, the light prompter sends a light prompt message. Specifically, the first end of the light prompter can be connected to the first access end of the electromagnet, and the second end of the light prompter can be connected to the neutral line drawn from the power supply. When the heater works to energize the electromagnet, the light prompter emits light, and when the heater does not work and the electromagnet loses power, the light prompter does not emit light. Further, the power equipment is arranged in the shell of the box (cabinet), and the light prompter can be arranged outside the shell so that the light prompter can send the light prompt message outside the shell to prompt the relevant inspection personnel to know the operating status of the heater. Further, the device further comprises a buzzer, which is connected in series with the electromagnet so that when the normally open contact is turned on, the buzzer sends a sound prompt message. The embodiment provided by the present application can quickly send sound and light prompt messages to the inspection personnel based on the light prompter or buzzer, thereby improving the efficiency of determining the working status of the heater.

[0045] In one embodiment, Figure 3As shown, the device and the power equipment (not shown in the figure) are arranged in the housing 600, where the housing 600 can be the outer shell of the box (cabinet) body of the power equipment, and the heater 300 and the power equipment are arranged together in the housing 600 to heat the power equipment. Further, a detection point mark is arranged at a preset position on the outer surface of the housing 600, and the electromagnet 200 is arranged at the inner side of the housing 600 where the detection point mark is located. When the electromagnet 200 is energized, it can generate a magnetic field at the detection point mark, so that when the operator holds the handheld indicator 500 close to the detection point mark, the indicator light 520 of the handheld indicator 500 emits light, so that the operator determines that the heater 300 is in working state. In the embodiment provided by the present application, a mark is set at the position where the electromagnet is located, so that the personnel can detect from the outside of the box (cabinet) body of the power equipment of the substation, and quickly and accurately determine the working state of the heater in the box (cabinet). Further, the detection point mark can be a "detection point" mark pasted on the outside of the box (cabinet) body of the substation.

[0046] The state prompt device of the heater provided in this embodiment, when the heater of the electric equipment obtains power from the power supply line and starts heating, the overcurrent relay detects that the current in the power supply line meets the preset requirements, and turns on the normally open contact of the overcurrent relay, so that a conductive loop is formed between the electromagnet, the neutral line drawn from the power supply, and the live line drawn from the power supply, so that the electromagnet generates a magnetic field. Further, when the inspector holds the handheld indicator and approaches the inspection point mark where the electromagnet is located, the magnetic field generated by the electromagnet turns on the magnetic control switch, and the series circuit composed of the magnetic control switch, the indicator power supply and the indicator light is turned on, so that the indicator light is illuminated, at this time, the inspector can judge that the heater is working normally; on the contrary, if the heater does not obtain the working current from the power supply line, the normally open contact of the overcurrent relay is disconnected, so that the electromagnet cannot be energized to generate a magnetic field, and when the inspector holds the handheld indicator and approaches the electromagnet, the magnetic control switch, the indicator power supply and the indicator light cannot form a series circuit, so that the indicator light does not light up, at this time, the inspector can judge that the heater is not in working state, so that the inspector can quickly and accurately determine the working state of the heater.

[0047] Furthermore, this embodiment provides a heating system for electric equipment, such as Figure 4 As shown, the system includes the above-mentioned heater status prompting device, as well as a temperature and humidity sensor 800 , a thermostat 700 and a heater 300 .

[0048] Specifically, the temperature and humidity sensor 800 is arranged at the power device (not shown in the figure) to collect the temperature information of the location of the power device; further, the thermostat 700 is connected to the temperature and humidity sensor 800 to receive the temperature information; further, the heater 300 is arranged at the power device, and the heater 300 is connected to the power supply end of the thermostat 700 through the power supply line 400 to obtain the power supply current required for the operation of the heater 300. Here, the thermostat 700 can provide the heater 300 with a working power supply through the power supply line 400, and further, the thermostat 700 can obtain power from an external power supply and supply power to the heater 300.

[0049] Furthermore, the thermostat 300 is configured to perform the following processing:

[0050] First, the temperature information is compared with a preset temperature threshold to determine whether the temperature information is less than the temperature threshold; wherein the temperature threshold can be determined according to actual conditions. Then, if the temperature information is less than the temperature threshold, the heater 300 is powered via the power supply line 400, so that the heater 300 is in a working state; conversely, if the temperature information is not less than the temperature threshold, the heater 300 is not powered via the power supply line 400, so that the heater 300 is in a stopped state.

[0051] The heating system for the electric equipment provided in this embodiment can determine whether the electric equipment is to be heated based on the temperature value at the location of the electric equipment, and generate a magnetic field through an electromagnet during heating, so that the operation and maintenance personnel can quickly and accurately determine the working status of the heater by holding a handheld indicator, thereby ensuring the operating stability of the electric system.

[0052] In one embodiment, the temperature and humidity sensor is further used to collect the humidity value of the location where the power equipment is located, and send the humidity value to the thermostat; further, the thermostat is further configured to perform the following processing:

[0053] First, the humidity value is compared with a preset humidity value threshold to determine whether the humidity value is greater than or equal to the humidity value threshold, wherein the humidity value threshold can be determined according to actual conditions; then, if the humidity value is greater than or equal to the humidity value threshold, the heater is powered through the power line to put the heater in a working state; conversely, if the humidity value is less than the humidity value threshold, the heater is not powered through the power line to put the heater in a stopped state. The embodiment provided by the present application can collect the humidity value of the location of the power equipment, and determine whether to heat the power equipment based on the size of the humidity value, thereby preventing the power equipment from being in an environment with excessively high humidity and ensuring the operational stability of the power equipment.

[0054] In one embodiment, Figure 4 As shown, the system also includes a power supply E. Specifically, the live wire end of the power supply E is connected to the live wire receiving end 100 of the overcurrent relay, and the neutral wire end of the power supply E is connected to the neutral wire receiving end of the overcurrent relay 100 to provide working power to the overcurrent relay 100. Here, the power supply E can be an AC power supply. Further, the live wire end of the power supply E is also connected to the second end of the normally open contact of the overcurrent relay 100, and the neutral wire end of the power supply E is also connected to the first access end of the electromagnet 200 to provide working power to the electromagnet 200.

[0055] Further, the live wire end of the power supply E is also connected to the first power access end of the thermostat 700, and the neutral wire end of the power supply E is also connected to the second power access end of the thermostat 700 to provide working power for the thermostat 700; further, the power access end of the temperature and humidity sensor 800 is connected to the power output end of the thermostat 700 to obtain working power from the thermostat 700. The embodiment provided in the present application can provide a stable working power supply to the overcurrent relay and the electromagnet based on the power supply, thereby ensuring the operational stability of the system. The temperature and humidity sensor and the heater are powered by the thermostat, and the working state of the temperature and humidity sensor and the heater is better controlled by the thermostat, thereby improving the system's ability to control temperature and humidity.

[0056] The above serial numbers of this application are only for description and do not represent the advantages and disadvantages of the implementation scenarios. The above disclosure is only a few specific implementation scenarios of this application, but this application is not limited to them, and any changes that can be thought of by technicians in this field should fall within the scope of protection of this application.

Claims

1. A heater status prompt device, applied to a substation, characterized in that: The state prompting device of the heater comprises: an overcurrent relay, wherein a current monitoring terminal of the overcurrent relay is connected to a power supply line of a heater of an electric power device in the substation to monitor a power supply current obtained by the heater from the power supply line; An electromagnet, wherein a first access end of the electromagnet is connected to a neutral line drawn from an external power supply, a second access end of the electromagnet is connected to a first end of a normally open contact of the overcurrent relay, and a second end of the normally open contact is connected to a live line drawn from the power supply, When the overcurrent relay detects that the current value of the power supply current obtained by the heater is greater than or equal to the preset current value, the normally open contact of the overcurrent relay is turned on to enable the electromagnet to be energized and generate a magnetic field; The state prompting device of the heater further comprises: A handheld indicator, comprising a magnetically controlled switch, an indicator power supply and an indicator light connected in series, wherein the magnetically controlled switch is turned on when in a magnetic field; When the electromagnet is energized and generates a magnetic field, when the handheld indicator approaches the electromagnet, a series circuit consisting of the magnetic switch, the indicator power supply and the indicator light is turned on, causing the indicator light to emit light.

2. The heater status prompting device according to claim 1, characterized in that: The state prompting device of the heater further comprises: A light prompter is connected in series with the electromagnet so that when the normally open contact is turned on, the light prompter sends out light prompt information.

3. The heater status prompting device according to claim 2, characterized in that: The state prompting device of the heater further comprises: A buzzer is connected in series with the electromagnet so that when the normally open contact is turned on, the buzzer emits a sound prompt message.

4. The heater status prompting device according to claim 1, characterized in that: The magnetically controlled switch is a Hall effect switch.

5. The heater status prompting device according to claim 4, wherein the heater status prompting device and the electric device are arranged in a housing, wherein: A detection point mark is provided at a preset position on the outer surface of the shell; The electromagnet is arranged on the inner side surface of the shell at the position where the detection point mark is located.

6. The heater status prompting device according to any one of claims 1 to 5, characterized in that: The overcurrent relay comprises: A through-type current transformer, wherein the power supply line of the heater passes through the primary coil of the through-type current transformer, so that when the heater is powered by the power supply line, the secondary coil of the through-type current transformer generates current; A current relay, wherein the relay coil of the current relay is connected to the secondary side coil, and the relay normally open contact of the current relay is connected in series between the second access end of the electromagnet and the live wire of the power supply, so that when the secondary side coil generates current, the relay normally open contact of the current relay is in a conducting state, and the electromagnet is energized to generate a magnetic field.

7. A heating system for electric power equipment, characterized in that: The heating system of the electric equipment comprises a heater status prompt device according to any one of claims 1 to 6; The heating system of the electric power equipment also includes: A temperature and humidity sensor is disposed at the electric power equipment and is used to collect temperature information at the location of the electric power equipment; A thermostat, the thermostat being connected to the temperature and humidity sensor to receive the temperature information; A heater, the heater is arranged at the power device, and the heater is connected to the power supply terminal of the thermostat through a power supply line to obtain the power supply current required for the operation of the heater; The thermostat is configured to perform the following processing: Comparing the temperature information with a preset temperature threshold to determine whether the temperature information is less than the temperature threshold; If the temperature information is less than the temperature threshold, power is supplied to the heater through the power supply line to put the heater into working state.

8. The heating system for electric power equipment according to claim 7, characterized in that: The temperature and humidity sensor is also used to collect the humidity value of the location where the power equipment is located, and send the humidity value to the temperature controller; The thermostat is also configured to perform the following processing: Compare the humidity value with a preset humidity value threshold to determine whether the humidity value is greater than or equal to the humidity value threshold; If the humidity value is greater than or equal to the humidity value threshold, power is supplied to the heater through the power supply line to put the heater into working state.

9. The heating system for electric power equipment according to claim 7, characterized in that: The heating system of the electric power equipment also includes: A power supply, wherein the live wire end of the power supply is connected to the live wire receiving end of the overcurrent relay, and the neutral wire end of the power supply is connected to the neutral wire receiving end of the overcurrent relay, so as to provide working power to the overcurrent relay; The live wire end of the power supply is also connected to the second end of the normally open contact of the overcurrent relay, and the neutral wire end of the power supply is also connected to the first access end of the electromagnet.

10. The heating system for electric power equipment according to claim 9, characterized in that: The live wire end of the power supply is also connected to the first power access end of the thermostat, and the neutral wire end of the power supply is also connected to the second power access end of the thermostat to provide working power for the thermostat; The power supply input terminal of the temperature and humidity sensor is connected to the power supply output terminal of the thermostat to obtain working power from the thermostat.

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