CN211826218U

CN211826218U - Heater monitoring relay

Info

Publication number: CN211826218U
Application number: CN201921939331.6U
Authority: CN
Inventors: 陈创; 王幸; 江文东; 徐敏敏; 林利祥; 张海川; 程振华; 牛铭; 李津
Original assignee: Guangzhou Power Supply Bureau of Guangdong Power Grid Co Ltd
Current assignee: Guangzhou Power Supply Bureau of Guangdong Power Grid Co Ltd
Priority date: 2019-11-12
Filing date: 2019-11-12
Publication date: 2020-10-30
Anticipated expiration: 2029-11-12

Abstract

The present application relates to a heater monitor relay. The heater monitoring relay comprises a relay body, a power supply module, a load module, a normally closed contact module, a normally open contact module and an alarm module, wherein the load module is electrically connected to a phase connection wire of an air switch of a heater control power supply; the relay body is used for being in a release state when the current passing through the load module is smaller than or equal to a preset current value and is also used for being in a pull-in state when the current passing through the load module is larger than the preset current value; the heater monitoring relay has the advantages that the alarm module is connected with the normally-open contact module in series, the alarm module is switched on to automatically and timely give an alarm to remind operation and maintenance personnel of a transformer substation to handle, the safe operation of a power grid is guaranteed, the working state of the real-time relay body is realized, and the problem that the fault of the heater cannot be given an alarm to remind the operation and maintenance personnel of the transformer substation to repair or replace in time is solved.

Description

Heater monitoring relay

Technical Field

The present application relates to the field of electrical equipment, and more particularly, to a heater monitor relay.

Background

A traditional terminal box of a transformer substation, a switch cabinet or a heater loop of a control cubicle adopts a design mode of 'heating power supply air switch + heater' or 'heating power supply air switch + temperature and humidity controller + heater'. Under this kind of design, in case the heater has the trouble, lack the detecting element in the electric loop, can't report to the police and remind transformer substation operation and maintenance personnel in time to repair or change. In particular, when the equipment operating environment is humid, a secondary circuit short circuit may be caused to cause a serious power accident event.

Although a heating monitoring relay is added in a heater loop of some terminal box or switch cabinet or control cubicle, the heating relay is connected to a neutral line of a three-phase heater, and can sense zero-sequence current to alarm only when one phase or two phases have faults, and the monitoring relay cannot detect the zero-sequence current and cannot alarm when the three phases have faults.

SUMMERY OF THE UTILITY MODEL

Therefore, the problem that the fault of the heater cannot be alarmed to remind the transformer substation operation and maintenance personnel of timely repair or replacement is necessary; or the monitor relay fails to recognize a failure, a heater monitor relay is provided.

A heater monitor relay comprising:

a relay body;

the power module is arranged on the relay body;

the load module is electrically connected with the power supply module and is used for electrically connecting a phase wiring of the heater control power supply air switch; the relay body is used for being in a release state when the current passing through the load module is smaller than or equal to a preset current value and is also used for being in a pull-in state when the current passing through the load module is larger than the preset current value;

the normally closed contact module is arranged on the relay body and electrically connected with the relay body, and the normally closed contact module keeps closed when the relay body is in a release state;

the normally open contact module is arranged on the relay body and electrically connected with the relay body, and the normally open contact module is kept disconnected when the relay body is in a release state; when the relay body is in an attraction state, the relay body controls the normally closed contact module to be disconnected and controls the normally open contact module to be closed;

the alarm module is arranged on the relay body and connected with the normally-open contact module in series, and the alarm module is used for giving an alarm when the normally-open contact module is closed.

In the heater monitoring relay, the power supply module is arranged on the relay body and can be electrically connected to the phase wiring to supply power for the operation of the heater monitoring relay, and the load module is electrically connected with the heater control power supply air switch, so that the relay body can reliably judge the abnormal operation condition of the heater in the heater monitoring relay, and the problem that the relay body cannot identify faults is solved; when the heater works normally, the current passing through the load module is smaller than or equal to a preset current value, the relay body does not act and is in a release state; when the heater works abnormally, the current passing through the relay body is larger than a preset current value, and the relay body acts and is in an attraction state; because the normally closed contact module and the normally open contact module are both electrically connected with the relay body, when the monitoring relay is in a release state, the normally closed contact module is kept closed, and the normally open contact module is kept open; on the contrary, when the monitoring relay is in the attraction state, the normally closed contact module is kept to be disconnected, and the normally open contact module is kept to be closed; because the alarm module is connected with the normally open contact module in series, the alarm module is switched on to automatically and timely give an alarm, so that operation and maintenance personnel of the transformer substation are reminded to handle, the safe operation of a power grid can be guaranteed, the working state of the heater is monitored in real time, and the problem that the fault of the heater cannot be reported to the police to remind the operation and maintenance personnel of the transformer substation to repair or replace in time is solved.

In one embodiment, the normally closed contact module includes a first shunt line provided in parallel with the relay body and a normally closed switch provided on the first shunt line; the normally closed switch is kept closed when the relay body is in a release state; when the relay body is in the attraction state, the relay body controls the normally closed switch to be switched off, so that the normally closed contact module is kept closed when the relay body is in the release state and is kept switched off when the relay body is in the attraction state.

In one embodiment, the normally open contact module comprises a second parallel connection line and a normally open switch, the second parallel connection line is connected with the relay body in parallel, and the normally open switch is arranged on the second parallel connection line; the normally open switch is kept open when the relay body is in a release state; when the relay body is in the attraction state, the relay body controls the normally open switch to be closed, so that the normally open contact module is kept to be disconnected when the relay body is in the release state and kept to be closed when the relay body is in the attraction state.

In one embodiment, the heater monitoring relay further comprises a plurality of driving modules arranged on the relay body, the gears of the driving modules correspond to the loads of the heaters one by one, so that the relay body can give an alarm at the gears of the load reduction of the heaters, and the applicability of the heater monitoring relay is improved.

In one embodiment, the number of the toggle switches is four, and the toggle switches are respectively a first toggle switch, a second toggle switch, a third toggle switch and a fourth toggle switch, the first toggle switch, the second toggle switch, the third toggle switch and the fourth toggle switch are arranged side by side, and the first toggle switch, the second toggle switch, the third toggle switch and the fourth toggle switch respectively correspond to a plurality of different gears of the driving module. The first toggle switch corresponds to a first gear of the driving module, the second toggle switch corresponds to a second gear of the driving module, the third toggle switch corresponds to a third gear of the driving module, and the fourth toggle switch corresponds to a fourth gear of the driving module. The user can select different toggle switches as required, and the use convenience of the heater monitoring relay is improved.

In one embodiment, the heater monitoring relay further comprises a first indicating module, the first indicating module is connected with the alarm module in series, and the first indicating module is used for emitting light when the normally-open contact module is closed, namely, the relay body acts, and is switched from a release state to an attraction state, so that the alarm module and the indicating module are both in a conduction state, and the indicating module emits light when the alarm module gives an alarm, so that operation and maintenance personnel of a transformer substation are better reminded of handling the alarm module.

In one embodiment, the load module is electrically connected to the three-phase connection of the heater control power supply air switch to enable the heater monitor relay to monitor the operation of the three-phase air switch.

In one embodiment, the load module is electrically connected to the live line of the heater control power air switch to enable the heater monitor relay to monitor the operation of the single phase air switch.

In one embodiment, the current passing through the relay body is used for being greater than the preset current value when the heater is in a fault or the load is reduced to a preset value, namely when the heater is in a fault or the load is reduced to a preset value, the current passing through the relay body is greater than the preset current value, and the heater is in abnormal operation, so that the relay body can simultaneously monitor the condition that the heater is in a fault or the load is reduced to the preset value.

Drawings

FIG. 1 is a terminal sub-diagram of a heater monitor relay of an embodiment;

FIG. 2a is a partial schematic diagram of a specific circuit of the heater monitor relay of FIG. 1;

FIG. 2b is another partial schematic diagram of an embodiment of the heater monitor relay of FIG. 1;

FIG. 2c is another partial schematic diagram of an embodiment of the heater monitor relay of FIG. 1;

FIG. 2d is another partial schematic diagram of a specific circuit of the heater monitor relay of FIG. 1.

Detailed Description

To facilitate an understanding of the present application, a heater monitor relay will be described more fully below with reference to the associated drawings. The preferred embodiment of the heater monitor relay is shown in the drawings. However, the heater monitor relay may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure of the heater monitor relay is more thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the heater monitor relay is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, the heater monitor relay of an embodiment is used in a terminal cabinet or a junction box or a switch cabinet. In one embodiment, the heater monitor relay includes a relay body, a power module 100, a load module 200, a normally closed contact module 300, a normally open contact module 400, and an alarm module 500. The power module is arranged on the relay body. In this embodiment, two ends of the power module are electrically connected to the live line and the neutral line, respectively.

In one embodiment, the load module is arranged on the relay body and electrically connected with the power module, and the load module is used for being electrically connected with a phase wiring of the heater control power supply air switch and monitoring the working state of the heater so as to give an alarm in time when the heater fails or the load is reduced, remind substation operation and maintenance personnel to handle and guarantee the safe operation of a power grid. The relay body is used for being in a release state when the current passing through the load module is smaller than or equal to a preset current value, and is also used for being in a pull-in state when the current passing through the load module is larger than the preset current value. Referring also to fig. 2, fig. 2 is a schematic circuit connection diagram of a heater monitor relay according to an embodiment. One end of the power supply module is connected with a live wire L with a contact 1 of the relay body, the other end of the power supply module is connected with a zero line N with a contact 11 of the relay body, and a power supply loop is formed between the contact 1 and the contact 11. One end of the load module and the contact 2 of the relay body are connected with the A1 end of the load, and the other end of the load module and the contact 12 of the relay body are connected with the A2 end of the load, so as to form a load loop. In one embodiment, the heater control power supply air switch is connected in series in the load circuit.

In one embodiment, the relay body is configured to be in a release state when the current passing through the load module is less than or equal to a preset current value, and is further configured to be in a pull-in state when the current passing through the load module is greater than the preset current value. In this embodiment, when the current passing through the load module is less than or equal to the preset current value, i.e., whether the power of the load module is less than or equal to the preset power value of the load module, the heater operates normally.

In one embodiment, the preset current value is a current threshold value for determining whether the relay body is operated, i.e., a current threshold value for determining whether the relay body is switched from the release state to the pull-in state. In this embodiment, a toggle switch of a drive module is added to a heater monitor relay to set power of a plurality of gears. When the power of the load module changes, whether the power is recovered to a set value is judged to decide whether to alarm or not. If the power of the load module is larger than the preset current value, the relay body is in a suction state, and the heater monitors the relay to give an alarm. If the power of the load module is smaller than or equal to the preset current value, the relay body is in a release state, and the heater monitoring relay does not give an alarm. The power set value is changed by shifting the switch in real time, so that the size of the preset current value is changed.

In one embodiment, the current passing through the relay body is used for being larger than the preset current value when the heater is in a fault or the load is reduced to a preset value, namely when the heater is in a fault or the load is reduced to a preset value, the current passing through the relay body is larger than the preset current value, and the heater is in abnormal operation, so that the relay body can simultaneously monitor the condition that the heater is in a fault or the load is reduced to the preset value.

In one embodiment, the normally closed contact module 300 is disposed on and electrically connected to the relay body. The normally closed contact module 300 remains closed when the relay body is in the released state. The normally open contact module 400 is disposed on and electrically connected to the relay body. The normally open contact module 400 remains open when the relay body is in the released state.

In the present embodiment, one end of the normally closed contact module 300 is electrically connected to the contact 3 of the relay body, and the other end is electrically connected to the contact 13 of the relay body. When the heater normally works, that is, the current transformer CT recognizes that the phase current is greater than the set value, the normally closed contact module 300 between the contact 3 and the contact 13 maintains the closed state, and the potential of the contact 3 is the same as that of the contact 13. The normally open contact module 400 has one end electrically connected to the contact 4 of the relay body and the other end electrically connected to the contact 14 of the relay body. When the heater normally operates, that is, the current transformer CT recognizes that the phase current is greater than the set value, the normally open contact module 400 between the contact 4 and the contact 14 of the relay body maintains the open state.

When the relay body is in the release state, the relay body controls the normally closed contact module 300 to be closed and controls the normally open contact module 400 to be opened. When the relay body is in the attraction state, the relay body controls the normally closed contact module 300 to be opened and controls the normally open contact module 400 to be closed. In the present embodiment, the normally closed contact module 300 is arranged side by side with the normally open contact module 400. In this embodiment, the relay body includes a control chip, and a plurality of pins of the control chip are electrically connected with the normally open contact module and the normally closed contact module, respectively. The detailed connection is shown in the schematic circuit diagram of fig. 2. The control chip may be STM8S 105K.

In one embodiment, the alarm module 500 is provided to the relay body. The alarm module is connected in series with the normally open contact module 400, and the alarm module 500 is used to alarm when the normally open contact module 400 is closed. In this embodiment, when the heater is in abnormal operation, the current through the load module is greater than the preset current value, the action of the relay body is changed into the attraction state, the normally closed contact module 300 is controlled to be disconnected, the normally open contact module 400 is controlled to be closed, the normally open contact module 400 is enabled to be connected, the alarm module 500 is in the alarm state, and the transformer substation operation and maintenance personnel are reminded to handle the normally closed contact module, so that the safe operation of the power grid is guaranteed.

Referring again to fig. 1, in one embodiment, the normally closed contact module 300 includes a first shunt wire 310 and a normally closed switch 320. The first parallel connection line 310 is provided in parallel with the relay body. The normally closed switch 320 is provided on the first parallel connection line. The normally closed switch 320 remains closed when the relay body is in the released state. When the relay body is in the pull-in state, the relay body controls the normally closed switch 320 to be turned off, so that the normally closed contact module 300 is kept closed when the relay body is in the release state and is kept turned off when the relay body is in the pull-in state.

Referring again to fig. 1, in one embodiment, the normally open contact module 400 includes a second parallel connection 410 and a normally open switch 420. The second parallel connection line 410 is provided in parallel with the relay body. The normally open switch 420 is provided on the second parallel connection line. The normally open switch 420 remains open when the relay body is in the released state. When the relay body is in the attraction state, the relay body controls the normally open switch 420 to be closed, so that the normally open contact module 400 is kept open when the relay body is in the release state and is kept closed when the relay body is in the attraction state. In this embodiment, the alarm module is disposed on the second parallel connection line.

In one embodiment, the heater monitor relay further comprises a driving module provided to the relay body. The gears of the driving modules are multiple, the gears of the driving modules correspond to the loads of the heaters in multiple different modes one to one, so that the relay body can give an alarm in the gear with the load of the heaters in multiple different modes, and the applicability of the heater monitoring relay is improved. In the present embodiment, the drive modules provided with different gear positions may be selected corresponding to different load reduction amounts of the heater. The unit of the load reduction is the same as the unit of the power, i.e., W. In one embodiment, the number of gears of the drive module is four. In other embodiments, the gears of the driving module are not limited to four, and can be designed according to actual needs.

In one embodiment, the driving module is provided with a plurality of toggle switches, and the toggle switches are in one-to-one correspondence with the gears. Each toggle switch is used for controlling the normally closed contact module 300 to be opened when the relay body is in the attraction state and controlling the normally open contact module 400 to be closed, so that the normally closed contact module 300 is opened when the relay body is in the attraction state and the normally open contact module 400 is closed. Each toggle switch is used for controlling the normally closed contact module 300 to be closed when the relay body is in a release state, and controlling the normally open contact module 400 to be opened, so that the normally closed contact module 300 is closed and the normally open contact module 400 is opened when the relay body is in the release state.

In one embodiment, the plurality of toggle switches are respectively a first toggle switch, a second toggle switch, a third toggle switch and a fourth toggle switch, and the first toggle switch, the second toggle switch, the third toggle switch and the fourth toggle switch respectively correspond to a plurality of different gears of the driving module. The first toggle switch corresponds to a first gear of the driving module, the second toggle switch corresponds to a second gear of the driving module, the third toggle switch corresponds to a third gear of the driving module, and the fourth toggle switch corresponds to a fourth gear of the driving module. The user can select different toggle switches as required, and the use convenience of the heater monitoring relay is improved.

In one embodiment, each gear of the driving module is integral multiple of the preset power, so that the heater monitoring relay can accurately and timely give an alarm in the load reduction of a plurality of different heaters, and the applicability of the heater monitoring relay is improved. In this embodiment, the unit of the preset power is the same as the unit of the load reduction amount, and is W.

In one embodiment, the driving module is provided with a plurality of toggle switches, the load of the heater corresponding to each toggle switch is different, and different loads of the heater can be adjusted by toggling any toggle switch, so that different powers of the heater can be set, namely different power gears of the heater can be set. When different heater settings are changed, the corresponding toggle switch is toggled, so that the heater monitoring relay is convenient and quick to use, the heater monitoring relay can alarm on the gears of the load reduction amount of a plurality of different heaters, and the applicability of the heater monitoring relay is improved. In this embodiment, the plurality of toggle switches correspond to the plurality of gears of the driving module one to one.

In one embodiment, each toggle switch is used for controlling the normally closed contact module 300 to be opened when the relay body is in the attraction state and controlling the normally open contact module 400 to be closed, so that the normally closed contact module 300 is opened and the normally open contact module 400 is closed when the relay body is in the attraction state. Each toggle switch is used for controlling the normally closed contact module 300 to be closed when the relay body is in a release state, and controlling the normally open contact module 400 to be opened, so that the normally closed contact module 300 is closed and the normally open contact module 400 is opened when the relay body is in the release state.

In one embodiment, the number of the toggle switches is four, and the toggle switches are respectively a first toggle switch, a second toggle switch, a third toggle switch and a fourth toggle switch, and the first toggle switch, the second toggle switch, the third toggle switch and the fourth toggle switch are arranged side by side, so that the structure of the heater monitoring relay is more compact. In one embodiment, the number of gears of the drive module is four. In other embodiments, the gears of the driving module are not limited to four, and can be designed according to actual needs.

In one embodiment, the first toggle switch, the second toggle switch, the third toggle switch and the fourth toggle switch respectively correspond to a plurality of different gears of the driving module. The first toggle switch corresponds to a first gear of the driving module, the second toggle switch corresponds to a second gear of the driving module, the third toggle switch corresponds to a third gear of the driving module, and the fourth toggle switch corresponds to a fourth gear of the driving module. The user can select different toggle switches as required, and the use convenience of the heater monitoring relay is improved.

In one embodiment, each gear of the driving module is integral multiple of the preset power, so that the relay body can accurately and timely give an alarm in the load reduction of a plurality of different heaters, and the applicability of the heater monitoring relay is improved. In this embodiment, the unit of the preset power is the same as the unit of the load reduction amount, and is W.

In one embodiment, the preset power is 50W. In the present embodiment, when the driving module is in the first gear, the power of the load of the heater is 50W. When the driving module is in the second gear, the power of the load of the heater is 100W. When the driving module is in the third gear, the power of the load of the heater is 150W. When the driving module is in the fourth gear, the power of the load of the heater is 300W, so that the driving module can act at four gears corresponding to loads of 50W, 100W, 150W and 300W, namely, automatic alarm can be realized when the actual application load of any gear is reduced by 50W or more, and substation operation and maintenance personnel are reminded to repair or replace in time. The toggle switch can be toggled by a user to set any value in the 4 th gear, and then the next inquiry period takes effect. In one embodiment, the heater monitor relay further includes a first indication module, the first indication module is connected in series with the alarm module 500, and the first indication module is used for emitting light when the normally open contact module 400 is closed, that is, the relay body acts, and switches from a release state to an attraction state, so that the alarm module 500 and the first indication module are both in a conduction state, and thus the first indication module emits light when the alarm module 500 gives an alarm, and operation and maintenance personnel of the transformer substation are better reminded of handling.

In one embodiment, the heater monitor relay further comprises a second indication module connected in series with the normally closed contact module, the second indication module being configured to emit light when the normally closed contact module is closed; when the monitoring relay is in a release state, the second indicating module emits light; when the monitoring relay is in a pull-in state, the first indicating module emits light. The light emitting color of the first indicating module and the light emitting color of the second indicating module may be designed to be different colors so as to be distinguished. In this embodiment, the first indication module has a red light emitting color, and the second indication module has a green light emitting color, so that the first indication module has a different light emitting color from the second indication module.

In order to enable the heater monitor relay to monitor the operating condition of the three-phase air switch, in one embodiment, the load module is electrically connected to the three-phase wiring of the heater control power supply air switch to enable the heater monitor relay to monitor the operating condition of the three-phase air switch.

It is to be understood that in other embodiments, the heater monitor relay is not limited to monitoring the operating condition of the three-phase air switch, and may also monitor the operating condition of the single-phase air switch. In one embodiment, the load module is electrically connected to the hot line of the heater control power supply air switch to enable the heater monitor relay to monitor the operation of the single phase air switch.

In one embodiment, the heater control power supply air switch is a three-phase air switch, and the heater monitoring relays RL are respectively connected to three connecting lines of the lower pile of the heater control power supply air switch. If the heater control power supply air switch is a single-phase air switch, the heater monitoring relay RL is connected with a live wire. When the heater normally works, the relay body does not act, the

output contacts

3 and 13 are closed, and the

contacts

4 and 14 are disconnected. When the heater is damaged or the load reduction reaches a set value, the current through the phase changes, i.e., the current through the load module changes. When the current passing through the phase is larger than the set action fixed value of the load module, the relay body can act and indicate that the lamp emits red light, the outlet of the output contact gives an alarm, and at the moment, the

contacts

3 and 13 are disconnected, and the

contacts

4 and 14 are closed.

In one embodiment, when the load of the heater is reduced to an integral multiple of 50W or more, that is, the current transformer CT recognizes that the phase current is smaller than the set value, the normally open contact module 400 between the contact 4 and the contact 14 is closed, the alarm circuit is turned on, the relay body is actuated and the indicator lamp emits red light, and an alarm signal is sent.

In one embodiment, the heater monitor relay is rated at AC220V and rated at 50W to 300W. In one embodiment, the maximum contact capacity of the heater monitor relay is specifically: for direct current, the load shedding capacity is 250V or less, τ is 5ms, the inductive load is 50W, and the resistive load is 150W; for ac, the load shedding capacity is 250V or less, and the load is 1200 VA. The heater monitor relay allows a long-term on current of 5A. In one embodiment, the maximum power consumption of the heater monitor relay is no greater than 1.5VA at a rated voltage of 220 VAC. In one embodiment, the insulation resistance of the heater monitor relay is measured by using an open circuit voltage of 500V megohmmeter to measure the insulation resistance between the conductive terminals of the relay connected together and the exposed non-live metal part or housing, which should not be less than 10M omega. In one embodiment, the insulation withstand voltage of the heater monitoring relay is that each leading-out terminal can bear 2000V of power frequency voltage to a shell locking screw, and the power frequency voltage between the same group of contacts can bear 1000V of power frequency voltage for one minute without breakdown.

The anti-interference performance of the heater monitoring relay meets the national GB6162-85 standard of Electrical interference test of static relays and protective devices. In one embodiment, the electrical lifetime of the heater monitor relay is 104 times or more when the current τ is cut off for 5ms and 50W in the DC250V loop. In one embodiment, the contacts of the heater monitor relay for mechanical life are 300 ten thousand times in the no load condition.

The heater monitor relay has the following characteristics:

1) the load loss of 50W can be recognized at minimum, namely in the selection of four gears with loads of 50W, 100W, 150W and 300W, if the load loss of 50W or more is actually applied to any gear, the alarm can be given.

2) The high-performance sealed relay is adopted, so that the moisture-proof, dustproof and high-reliability relay is realized, and the disconnection is avoided.

3) The operation voltage is accurate, no jitter is generated, the power consumption is low, and a plurality of contacts operate or return simultaneously.

4) An indicator light is used for indicating after the relay acts.

5) The relay has long electrical and mechanical life.

6) The insulating and voltage-resisting level is high, the contact capacity is large, and the contact resistance of the contact is small.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A heater monitor relay, comprising:

a relay body;

the power module is arranged on the relay body;

the load module is electrically connected with the power supply module and is used for electrically connecting the heater monitoring relay to control the phase wiring of the power supply air switch; the relay body is used for being in a release state when the current passing through the load module is smaller than or equal to a preset current value and is also used for being in a pull-in state when the current passing through the load module is larger than the preset current value;

2. The heater monitor relay according to claim 1, wherein the normally closed contact module includes a first shunt wire provided in parallel with the relay body and a normally closed switch provided on the first shunt wire; the normally closed switch is kept closed when the relay body is in a release state; when the relay body is in the attraction state, the relay body controls the normally closed switch to be switched off.

3. The heater monitor relay according to claim 1, wherein the normally open contact module comprises a second shunt wire provided in parallel with the relay body and a normally open switch provided on the second shunt wire; the normally open switch is kept open when the relay body is in a release state; when the relay body is in the attraction state, the normally open switch is controlled to be closed by the relay body.

4. The heater monitor relay according to claim 1, further comprising a plurality of driving modules provided to the relay body, wherein the plurality of driving modules are provided at a plurality of stages, and the plurality of driving modules are provided at stages corresponding to loads of a plurality of different heater monitor relays.

5. The heater monitor relay according to claim 4, further comprising four toggle switches, namely a first toggle switch, a second toggle switch, a third toggle switch and a fourth toggle switch, wherein the first toggle switch, the second toggle switch, the third toggle switch and the fourth toggle switch are arranged side by side.

6. The heater monitor relay according to claim 1, further comprising a first indicator module disposed in series with the alarm module, the first indicator module adapted to illuminate when the normally open contact module is closed.

7. The heater monitor relay according to claim 6, further comprising a second indicator module connected in series with the normally closed contact module, the second indicator module being configured to illuminate when the normally closed contact module is closed.

8. The heater monitor relay according to any one of claims 1 to 7, wherein the load module is electrically connected to a three-phase connection of the heater monitor relay control power supply air switch.

9. The heater monitor relay according to any one of claims 1 to 7, wherein the load module is electrically connected to a live line of the heater monitor relay control power air switch.

10. The heater monitor relay according to any one of claims 1 to 7, wherein the current passing through the relay body is configured to be greater than the preset current value when the heater is in a fault or the load is reduced to a predetermined value.