CN116316426A - Prevent electric energy meter binding post overheat protection circuit - Google Patents
Prevent electric energy meter binding post overheat protection circuit Download PDFInfo
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- CN116316426A CN116316426A CN202310323998.8A CN202310323998A CN116316426A CN 116316426 A CN116316426 A CN 116316426A CN 202310323998 A CN202310323998 A CN 202310323998A CN 116316426 A CN116316426 A CN 116316426A
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- 239000003990 capacitor Substances 0.000 claims description 12
- 230000005611 electricity Effects 0.000 description 10
- 206010000369 Accident Diseases 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000013021 overheating Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 208000025274 Lightning injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010616 electrical installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/047—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using a temperature responsive switch
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to a protection circuit for preventing overheat of a wiring terminal of an electric energy meter, which relates to the technical field of circuit protection and comprises a temperature control relay for measuring the wiring terminal of the electric energy meter, and a temperature control relay arranged on a wiring terminal of an in-out wire of the electric energy meter.
Description
Technical Field
The invention relates to the technical field of circuit protection, in particular to a protection circuit for preventing an electric energy meter wiring terminal from overheating.
Background
Electric energy is one of the most important energy sources necessary for social production and people's life. In the whole electric power market operation, the electric energy meter is used as a basis for trade settlement of electric power products, and the electric energy meter is extended to thousands of households. In recent years, along with the continuous improvement of the living standard of people and the popularization of household appliances, the hidden danger is buried for the safe use of electricity in particular to the application of high-power household electric equipment. According to the daily report of the fire rescue office of the emergency management department, in 2020, 25.2 tens of thousands of fires are reported by the national fire rescue teams together, and the direct property loss is 40.09 hundred million yuan, which is also one year with the least number of major fires in the last eight years; the electrical reasons continue to strongly influence the fire behavior from the fire classification. Among the various causes of fire accidents, the total number of fires caused by violating the regulations for electrical installation and use is 8.5 ten thousand, accounting for 33.6% of the total number. From the classification of electrical fires, 68.9% of the total number is caused by line problems such as short circuits, overload, poor contact, etc. The emergency management department fire rescue agency publishes a national fire situation report for 1-10 months in 2021. From the fire category, among various reasons for causing fire accidents, the electric fire is still in the top of the house and accounts for 50.4% of the total number of fires. The safe electricity utilization is the obligation of the electric power enterprises, and is also the embodiment of social obligation.
Although the electric energy meter makes great contribution to fair electricity consumption in trade settlement, potential safety hazards exist in the long-term operation process, in the annual electric fire accident, the fire accident caused by the burning of the electric energy meter also occupies great proportion, and how to eliminate the fire accident caused by the damage of the electric energy meter is the responsibility that the electric power personnel cannot push away. Through statistics and analysis of damage to electric energy meters of companies in China county in recent years and statistics and analysis of results of statistics of other county and city companies, the failure damage rate of the electric energy meters caused by lightning stroke, overvoltage, overload and other reasons is about 3 percent per year, the damage to the electric energy meters caused by heating of the connecting terminals accounts for about 0.15 percent per year of the total damage rate, 8850 thousands of metering users of the national network company are calculated, about 12 thousands of electric energy meters are damaged by heating of the connecting terminals each year, and how to control the 12 thousands of fire source points is needed, so that fire accidents caused by heating damage of the connecting terminals of the electric energy meters are overcome.
Disclosure of Invention
In order to overcome the defects in the prior art, the main purpose of the invention is to provide a protection circuit for preventing the terminal of the electric energy meter from overheating.
In order to achieve the above purpose, the invention adopts the following technical scheme that the protection circuit for preventing the terminal of the electric energy meter from overheating comprises an electric energy meter load switch K1 arranged on the electric energy meter, a control power supply of the electric energy meter, and further comprises: temperature relay FN1, stabilized power supply, first non-return diode D1, second non-return diode D2, third non-return diode D3, fourth non-return diode D4, relay JDQ1, relay JDQ2, magnetic latching relay JDQ3 and capacitor C1;
the temperature relay FN1 is connected with a wiring terminal of the measuring electric energy meter;
the positive pole of the stable power supply is respectively connected with one end of the temperature relay FN1, the positive pole of the second non-return diode D2 and the normally open contact of the relay JDQ1, the other end of the temperature relay FN1 is connected with the normally open contact of the magnetic latching relay JDQ3, the negative pole of the second non-return diode D2 is respectively connected with the reset key switch S2 and the electric energy meter load switch K1 through the relay JDQ2, the negative pole of the second non-return diode D2 is respectively connected with the positive pole of the third non-return diode D3 and the positive pole of the fourth non-return diode D4, the negative pole of the third non-return diode D3 is respectively connected with the negative pole of the relay JDQ1 and the normally open contact of the capacitor C1, the negative pole of the fourth non-return diode D4 is respectively connected with the electric energy meter load switch K1 and the relay JDQ1, the negative pole of the second non-return diode D2 is respectively connected with the negative pole of the relay JDQ1, and the positive pole of the relay JDQ1 is respectively connected with the positive pole of the first non-return diode D1.
Preferably, the types of the relay JDQ1 and the relay JDQ2 are HFD2/005-S-L1.
Preferably, the model of the magnetic latching relay JDQ3 is ADW1205HL-5V_16A.
Preferably, the first non-return diode D1, the second non-return diode D2, the third non-return diode D3, and the fourth non-return diode D4 are all MM5Z5V1ST1G.
Preferably, the capacitor C1 is 22uf/16V.
Preferably, the temperature relay FN1 is connected with a connecting terminal on an in-out line of the electric energy meter.
Compared with the prior art, the invention has the beneficial effects that:
the invention solves the matching connection of the temperature control loop and the internal control loop of the electric energy meter through the matching of the magnetic latching relay and the conventional relay; when the wiring terminal heats up due to poor contact, overload and the like or the wiring terminal heats up, when the heating temperature reaches the set temperature, the temperature relay acts to output an overtemperature signal, the temperature control circuit starts the magnetic latching relay of the electric energy meter according to the overtemperature signal sent by the temperature relay, the output load of the electric energy meter is disconnected to stop supplying power to a user, and the electric energy meter burning accident caused by heating of the wiring terminal of the electric energy meter is prevented by forcibly disconnecting the electric load of the user, so that the property safety of the electric energy meter and the user is protected, and the fire accident caused by burning of the electric energy meter is prevented; the electric energy meter is prevented from being burnt out due to overload or loosening of the connecting terminal, and fire accidents caused by the burnt out electric energy meter are prevented; the functional design of the intelligent electric energy meter is perfected.
Drawings
FIG. 1 is a schematic diagram of the overheat control of the terminal of the electric energy meter of the present invention;
FIG. 2 is a circuit diagram of the overheat protection of the connecting terminal of the single-phase electric energy meter of the invention;
fig. 3 is a circuit diagram of the three-phase electric energy meter wiring terminal overheat protection circuit of the invention.
Detailed Description
The invention will be further described with reference to the drawings and embodiments.
Examples:
referring to fig. 1, a protection circuit for preventing overheat of a connection terminal of an electric energy meter includes an electric energy meter load switch K1 disposed on the electric energy meter, a control power supply of the electric energy meter, and further includes: temperature relay FN1, stabilized power supply, first non-return diode D1, second non-return diode D2, third non-return diode D3, fourth non-return diode D4, relay JDQ1, relay JDQ2, magnetic latching relay JDQ3 and capacitor C1;
the temperature relay FN1 is connected with a wiring terminal of the measuring electric energy meter;
the positive pole of the stable power supply is respectively connected with one end of a temperature relay FN1, the positive pole of a second non-return diode D2 and the normally open contact of a relay JDQ1, the other end of the temperature relay FN1 is connected with the normally open contact of a magnetic latching relay JDQ3, the negative pole of the second non-return diode D2 is respectively connected with a reset key switch S2, an electric energy meter load switch K1 and the negative pole of the second non-return diode D2 through the relay JDQ2, the relay JDQ1 is respectively connected with the positive poles of a third non-return diode D3 and a fourth non-return diode D4, the negative pole of the third non-return diode D3 is respectively connected with the negative pole of the relay Q1 and the positive pole of a capacitor C1, the negative pole of the fourth non-return diode D4 is respectively connected with the electric energy meter load switch K1 and the normally open contact of the relay JDQ1, the negative pole of the first non-return diode D1 is connected with the negative pole of the relay JDQ1 and grounded, and the positive pole of the first non-return diode D1 is respectively connected with the reset key switch S1.
Preferably, the type of the relay JDQ1 and the type of the relay JDQ2 are HFD2/005-S-L1.
The model of the magnetic latching relay JDQ3 is ADW1205HL-5V_16A.
The first non-return diode D1, the second non-return diode D2, the third non-return diode D3 and the fourth non-return diode D4 are respectively of the model MM5Z5V1ST1G.
The model of the capacitor C1 is 22uf/16V.
The temperature relay FN1 is connected with a wiring terminal on an inlet and outlet line of the electric energy meter.
Example 2
Referring to fig. 1-3, when the heating temperature of the wiring terminal of the electric energy meter rises, the FN1 temperature relay acts, positive electricity flows into the JDQ1 coil of the relay through the normally closed contact of the JDQ3 magnetic latching relay, so that the JDQ1 coil of the relay is electrified, the normally open contact of the JDQ3 relay is closed, positive and negative 12V voltages flow into the load switch of the electric energy meter and the JDQ3 magnetic latching relay through the non-return diodes D3 and D4, the load switch of the electric energy meter and the JDQ3 magnetic latching relay act, the load switch of the electric energy meter is disconnected after the load switch of the electric energy meter acts, and the capacitor C1 is connected in series in a loop to play a certain time delay role, so that the JDQ3 relay coil of the relay is prevented from excessively fast losing electricity, and the problem of inconsistent matching caused by the fact that the JDQ1 coil loses electricity when the load switch of the electric energy meter does not act, and a working power supply is disconnected is avoided.
The positive pole of the power supply is connected with the positive pole of the third diode, the negative pole of the third diode is connected with the positive pole of the fourth diode and the switch respectively, the two ends of the capacitor are connected with the two ends of D4 respectively, and the negative pole of D4 is connected with the negative pole of the switch and the negative pole of Q3 respectively.
In the case of on-site recovery, when the user fails after the load switch action of the electric energy meter is disconnected, the user recovers the power-on action of the load switch of the electric energy meter through resetting the key switch S1, and the electric energy meter recovers the power supply of the user. When the key switch S1 is pressed, the coil of the JDQ2 relay is electrified, the normally open contact of the JDQ2 relay is closed, 12V voltage flows into the JDQ1 relay control coil and the electric energy meter load switch K1 control coil respectively through the JDQ2 relay, so that the two magnetic latching relays act simultaneously, the user electricity is recovered to be normal, the auxiliary contact of the JDQ1 relay is recovered to be in a normally closed state, and the overheat control loop is recovered to be in a normal monitoring state. If the user can not normally use electricity through the reset key, the user can contact the electricity management department to check the electric equipment through the fault repairing telephone, and the normal power supply can be recovered after confirming that the heating source is eliminated.
Regarding remote recovery, after a user fails when the load switch of the electric energy meter acts to disconnect, a user power consumption instruction is transmitted and recovered through a power consumption management unit in a remote mode, the electric energy meter controls the power supply to be electrified, the JDQ1 relay and the two magnetic latching relays of the load switch of the electric energy meter act simultaneously, the user power consumption recovers normal power consumption, the auxiliary contact of the JDQ1 relay recovers a normally closed state, and the overheat control loop recovers a normal monitoring state.
In order to prevent the difference of positive and negative voltages of two control power supplies of the control loop caused by the relay movement or the refusal movement, D1, D2, D3, D4 and 4 non-return diodes are respectively designed in the control loop to ensure the normal operation of the control loop.
In order to prevent inconsistent actions of the JDQ1 magnetic latching relay and the electric energy meter magnetic latching load switch in the control process, a capacitor is designed in a temperature control loop, a certain delay and discharge are achieved, and synchronous actions of the JDQ1 magnetic latching relay and the electric energy meter magnetic latching load switch are ensured.
The development result of the overheat prevention control circuit of the wiring terminal of the electric energy meter only perfects a basic function of the intelligent electric energy meter, and indicates the direction for how to further know the intelligent electric energy meter and how to enable the electric energy meter to be an intelligent electricity utilization terminal management device of a user.
It is noted that in the present invention, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the scope of the present invention, and all designs which are the same or similar to the present invention are within the scope of the present invention.
Claims (6)
1. The utility model provides a prevent electric energy meter binding post overheat protection circuit, includes the electric energy meter load switch K1 that sets up on the electric energy meter, the control power supply of electric energy meter, its characterized in that still includes: temperature relay FN1, stabilized power supply, first non-return diode D1, second non-return diode D2, third non-return diode D3, fourth non-return diode D4, relay JDQ1, relay JDQ2, magnetic latching relay JDQ3 and capacitor C1;
the temperature relay FN1 is connected with a wiring terminal of the measuring electric energy meter;
the positive pole of the stable power supply is respectively connected with one end of the temperature relay FN1, the positive pole of the second non-return diode D2 and the normally open contact of the relay JDQ1, the other end of the temperature relay FN1 is connected with the normally open contact of the magnetic latching relay JDQ3, the negative pole of the second non-return diode D2 is respectively connected with the reset key switch S2 and the electric energy meter load switch K1 through the relay JDQ2, the negative pole of the second non-return diode D2 is respectively connected with the positive pole of the third non-return diode D3 and the positive pole of the fourth non-return diode D4, the negative pole of the third non-return diode D3 is respectively connected with the negative pole of the relay JDQ1 and the normally open contact of the capacitor C1, the negative pole of the fourth non-return diode D4 is respectively connected with the electric energy meter load switch K1 and the relay JDQ1, the negative pole of the second non-return diode D2 is respectively connected with the negative pole of the relay JDQ1, and the positive pole of the relay JDQ1 is respectively connected with the positive pole of the first non-return diode D1.
2. The circuit for preventing overheat of a connection terminal of an electric energy meter of claim 1, wherein the type of the relay JDQ1 and the type of the relay JDQ2 are HFD2/005-S-L1.
3. The protection circuit for preventing overheat of a connection terminal of an electric energy meter of claim 1, wherein the model JDQ3 of the magnetic latching relay is ADW1205HL-5v_16a.
4. The circuit of claim 1, wherein the first, second, third and fourth non-return diodes D1, D2, D3, D4 are all MM5Z5V1ST1G.
5. The protection circuit for preventing overheat of a connection terminal of an electric energy meter of claim 1, wherein the capacitor C1 is 22uf/16V in type.
6. The circuit of claim 1, wherein the temperature relay FN1 is connected to a terminal on an in-out line of the electric energy meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310323998.8A CN116316426A (en) | 2023-03-30 | 2023-03-30 | Prevent electric energy meter binding post overheat protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310323998.8A CN116316426A (en) | 2023-03-30 | 2023-03-30 | Prevent electric energy meter binding post overheat protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN116316426A true CN116316426A (en) | 2023-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310323998.8A Pending CN116316426A (en) | 2023-03-30 | 2023-03-30 | Prevent electric energy meter binding post overheat protection circuit |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205212430U (en) * | 2015-11-02 | 2016-05-04 | 江苏德力化纤有限公司 | Prevent that power supply loop flashover, node contact failure or vibration lead to mistake interlock circuit |
| CN108303193A (en) * | 2018-04-10 | 2018-07-20 | 国家电网公司 | A kind of connecting terminal overheating detection circuit and single-phase charge-controlled intelligent electric meter |
| CN109980606A (en) * | 2019-03-01 | 2019-07-05 | 常州猛犸电动科技有限公司 | A kind of thermal-shutdown circuit |
-
2023
- 2023-03-30 CN CN202310323998.8A patent/CN116316426A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205212430U (en) * | 2015-11-02 | 2016-05-04 | 江苏德力化纤有限公司 | Prevent that power supply loop flashover, node contact failure or vibration lead to mistake interlock circuit |
| CN108303193A (en) * | 2018-04-10 | 2018-07-20 | 国家电网公司 | A kind of connecting terminal overheating detection circuit and single-phase charge-controlled intelligent electric meter |
| CN109980606A (en) * | 2019-03-01 | 2019-07-05 | 常州猛犸电动科技有限公司 | A kind of thermal-shutdown circuit |
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