Submerged arc furnace low-voltage reactive compensation intelligent control unit

Abstract

The utility model provides a low-voltage reactive compensation intelligent control unit of a submerged arc furnace. The vacuum contactor is connected with the capacitor and is used for switching the capacitor; the microprocessor is connected with the vacuum contactor; and the ad hoc network wireless communication unit is connected with the microprocessor. And the microprocessor and the ad hoc network wireless communication unit are arranged, so that local autonomous control of switching of the vacuum contactor can be realized.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage reactive power compensation for an ore-fired furnace, in particular to an intelligent control unit for low-voltage reactive power compensation for an ore-fired furnace. Background Art

[0002] Chinese invention patent ZL201410032439.2 discloses an intelligent energy-saving control system for load of an ore-heating furnace, including: an intelligent energy-saving control unit for load; a current transformer, a first voltage transformer and a primary power comprehensive collection module on the primary side of an ore-heating furnace transformer; a squirrel-cage air-core current transformer, a second voltage transformer, a comprehensive conditioning module and a secondary power comprehensive collection module on the secondary side of an ore-heating furnace transformer; an ore-heating furnace transformer gear controller, one end of which is connected to the ore-heating furnace transformer and the other end is connected to the intelligent energy-saving control unit for load; a low-voltage reactive power compensation device control unit, which is connected to the intelligent energy-saving control unit for load; and a three-phase electrode lifting control unit, which is connected to the intelligent energy-saving control unit for load. Among them, the first voltage transformer and the current transformer on the primary side of the ore-heating furnace transformer are connected to the intelligent energy-saving control unit for load through the primary power comprehensive collection module, the squirrel-cage air-core current transformer is connected to the intelligent energy-saving control unit for load through the comprehensive conditioning module and the secondary power comprehensive collection module in turn, and the second voltage transformer is connected to the intelligent energy-saving control unit for load through the secondary power comprehensive collection module. The intelligent energy-saving control system of the ore-fired furnace load adopts the reasonable investment of low-voltage reactive power compensation device to meet the assessment of the primary side power factor and increase the active power in the furnace.

[0003] In addition, Chinese invention patent ZL202111535239.5 discloses a vacuum contactor for an electric arc furnace and a control method thereof, the operating current of which can be increased to more than 2000 amps to adapt to the large-scale electric arc furnace and the increase in the capacity of the collective capacitor.

[0004] However, the existing low voltage reactive power compensation device / unit still has the following disadvantages:

[0005] 1. The switching control signal needs to be transmitted through the signal line, and the on-site installation is complicated;

[0006] 2. If one of the multiple compensation units in the compensation cabinet fails, it will affect the use of the entire compensation cabinet and other compensation units in the cabinet;

[0007] 3. The capacitor capacity of each compensation unit in the compensation cabinet is the same and uniformly set. When in use, it can only be switched in units of cabinet capacity, and the total switching capacity that is an integer multiple of the cabinet capacity cannot be achieved;

[0008] 4. As described in Chinese invention patent ZL202111535239.5, a vacuum contactor with a current of 2000A or more is selected to increase the single switching capacity, but in actual applications, the price is high and the stability is still not ideal;

[0009] 5. The working status and environment of the capacitor banks and vacuum contactors of each compensation unit cannot be monitored.

[0010] Therefore, it is necessary to study a low-voltage reactive power compensation unit for an electric arc furnace to solve one or more of the above-mentioned technical problems. Utility Model Content

[0011] In order to solve at least one of the above technical problems, according to one aspect of the utility model, a low-voltage reactive power compensation intelligent control unit for a submerged arc furnace is provided, which is characterized in that it includes:

[0012] Capacitors;

[0013] A vacuum contactor connected to the capacitor and used for switching the capacitor;

[0014] a microprocessor connected to the vacuum contactor; and

[0015] The ad hoc network wireless communication unit is connected to the microprocessor.

[0016] According to another aspect of the present invention, the capacitor is a capacitor group composed of two or more capacitors connected in parallel.

[0017] According to another aspect of the utility model, the low-voltage reactive power compensation intelligent control unit of the submerged arc furnace further comprises a temperature sensor connected to the microprocessor, and the temperature sensor is respectively arranged at least one of the capacitor, the vacuum contactor contact and the compensation cabinet.

[0018] According to another aspect of the utility model, the low-voltage reactive power compensation intelligent control unit of the submerged arc furnace further includes a current transformer and a voltage sensor for measuring the current and voltage of the capacitor bank, and the current transformer and the voltage transformer are connected to the microprocessor.

[0019] According to another aspect of the utility model, the low-voltage reactive power compensation intelligent control unit of the submerged arc furnace further comprises a metering chip for active power loss and reactive power compensation capacity of the capacitor bank, and the metering chip is connected to the microprocessor.

[0020] According to another aspect of the utility model, the intelligent control unit for low-voltage reactive power compensation of the submerged arc furnace further includes a capacitor bank operating time timer and / or a vacuum contactor input times counter.

[0021] According to another aspect of the utility model, the low-voltage reactive power compensation intelligent control unit of the submerged arc furnace also includes a maintenance countdown timer.

[0022] According to another aspect of the utility model, the ad hoc network wireless communication unit includes a Bluetooth module and / or a WIFI module, and the capacity of each capacitor group is the same or different.

[0023] According to another aspect of the utility model, the current of the vacuum contactor is less than or equal to 1600 amperes.

[0024] According to another aspect of the utility model, the ad hoc network wireless communication units of two or more submerged arc furnace low-voltage reactive power compensation intelligent control units within a predetermined distance communicate with each other in an ad hoc network.

[0025] The utility model can achieve one or more of the following technical effects:

[0026] The low-voltage reactive power compensation device / unit is switched on and off autonomously, and a failure in one circuit will not affect the use of the entire compensation cabinet and other compensation units in the cabinet;

[0027] No need to lay signal lines on site, the total switching capacity can be adaptively adjusted in real time;

[0028] Selecting vacuum contactors with a current of 1600A or less improves system stability and reduces costs;

[0029] Real-time monitoring of information such as current, voltage and temperature of capacitor banks and vacuum contactors is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Figure 1 The figure is a schematic diagram of a low-voltage reactive power compensation unit for an electric arc furnace according to a preferred embodiment of the utility model. DETAILED DESCRIPTION

[0032] The best implementation mode of the present invention is described below through preferred embodiments in conjunction with the accompanying drawings. The specific implementation mode here is to illustrate the present invention in detail and should not be understood as a limitation to the present invention. Various deformations and modifications can be made without departing from the spirit and substantial scope of the present invention, which should be included in the protection scope of the present invention.

[0033] Example 1

[0034] According to a preferred embodiment of the present invention, see Figure 1 , provides an intelligent control unit for low-voltage reactive power compensation of an electric arc furnace, which is characterized by comprising:

[0035] Capacitors;

[0036] A vacuum contactor IVC, connected to the capacitor and used for switching the capacitor;

[0037] A microprocessor MCU connected to the vacuum contactor; and

[0038] The ad hoc network wireless communication unit is connected to the microprocessor.

[0039] Advantageously, a microprocessor and a self-organizing network wireless communication unit are provided to realize local autonomous control of the switching of the vacuum contactor.

[0040] According to another preferred embodiment of the utility model, the capacitor is a capacitor group composed of two or more capacitors connected in parallel. For example, the capacitor group includes capacitor 1, capacitor 2 and capacitor N, where N is greater than or equal to 3. Capacitors 1, 2 and N are connected to the vacuum contactor via fuses F1, F2 and FN respectively.

[0041] According to another preferred embodiment of the utility model, the low-voltage reactive power compensation intelligent control unit of the submerged arc furnace further comprises a temperature sensor 3 connected to the microprocessor, and the temperature sensor is respectively arranged at least one of the capacitor, the vacuum contactor contact and the compensation cabinet.

[0042] According to another preferred embodiment of the utility model, the submerged arc furnace low-voltage reactive power compensation intelligent control unit further includes a current transformer 5 for measuring the current of the capacitor bank, and the current transformer is connected to the microprocessor. Preferably, the submerged arc furnace low-voltage reactive power compensation intelligent control unit further includes a voltage sensor 4 for measuring the voltage of the capacitor bank.

[0043] According to another preferred embodiment of the utility model, the low-voltage reactive power compensation intelligent control unit of the submerged arc furnace further comprises a metering chip for active power loss and reactive power compensation capacity of the capacitor bank, and the metering chip is connected to the microprocessor.

[0044] According to another preferred embodiment of the utility model, the intelligent control unit for low-voltage reactive power compensation of the submerged arc furnace further includes a capacitor bank operation timer and / or a vacuum contactor input times counter.

[0045] According to another preferred embodiment of the utility model, the low-voltage reactive power compensation intelligent control unit of the submerged arc furnace also includes a maintenance countdown timer.

[0046] According to another preferred embodiment of the utility model, the ad hoc network wireless communication unit includes a Bluetooth module and / or a WIFI module, and the capacity of each capacitor group is the same or different.

[0047] According to another preferred embodiment of the present invention, the current of the vacuum contactor is less than or equal to 1600A.

[0048] According to another preferred embodiment of the utility model, the ad hoc network communication is performed between the ad hoc network wireless communication units of two or more submerged arc furnace low-voltage reactive power compensation intelligent control units within a predetermined distance.

[0049] Advantageously, temperature sensors, voltage sensors, current sensors, and metering chips for active power loss and reactive power compensation capacity are provided to achieve real-time monitoring of temperature, voltage, current, active power loss and reactive power compensation capacity, and to detect faults and withdraw from operation in a timely manner.

[0050] Advantageously, a capacitor bank operating time timer, a vacuum contactor switching times counter, and a maintenance countdown timer are provided to balance the switching frequency and operating time of the capacitor bank and increase its service life.

[0051] The utility model can achieve one or more of the following technical effects:

[0052] The low-voltage reactive power compensation device / unit is switched on and off autonomously, and a failure in one circuit will not affect the use of the entire compensation cabinet and other compensation units in the cabinet;

[0053] No need to lay signal lines on site, the total switching capacity can be adaptively adjusted in real time;

[0054] Selecting vacuum contactors with a current of 1600A or less improves system stability and reduces costs;

[0055] Real-time monitoring of information such as current, voltage and temperature of capacitor banks and vacuum contactors is achieved.

[0056] Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. An intelligent control unit for low-voltage reactive power compensation of an electric arc furnace. Features include: Capacitors; A vacuum contactor connected to the capacitor and used for switching the capacitor; A microprocessor connected to the vacuum contactor; as well as The ad hoc network wireless communication unit is connected to the microprocessor.

2. The low-voltage reactive power compensation intelligent control unit for a submerged arc furnace according to claim 1, Features The capacitor is a capacitor group consisting of two or more capacitors connected in parallel.

3. The intelligent control unit for low-voltage reactive power compensation of a submerged arc furnace according to claim 2, Features The low-voltage reactive power compensation intelligent control unit of the submerged arc furnace further comprises a temperature sensor connected to the microprocessor, and the temperature sensor is respectively arranged at least one of the capacitor, the vacuum contactor contact and the compensation cabinet.

4. The intelligent control unit for low-voltage reactive power compensation of a submerged arc furnace according to any one of claims 1 to 3, Features The low-voltage reactive power compensation intelligent control unit of the submerged arc furnace further comprises a current transformer and a voltage sensor for measuring the current and voltage of the capacitor bank, and the current transformer and the voltage transformer are connected to the microprocessor.

5. The intelligent control unit for low-voltage reactive power compensation of a submerged arc furnace according to claim 4, Features The low-voltage reactive power compensation intelligent control unit of the submerged arc furnace also includes a metering chip for active power loss and reactive power compensation capacity of a capacitor bank, and the metering chip is connected to a microprocessor.

6. The intelligent control unit for low-voltage reactive power compensation of a submerged arc furnace according to claim 4, Features The low-voltage reactive power compensation intelligent control unit of the submerged arc furnace further comprises a capacitor bank operation timer and / or a vacuum contactor input times counter.

7. The low-voltage reactive power compensation intelligent control unit for a submerged arc furnace according to claim 4, Features The low-voltage reactive power compensation intelligent control unit of the submerged arc furnace also includes a maintenance countdown timer.

8. The low-voltage reactive power compensation intelligent control unit for a submerged arc furnace according to claim 4, Features The ad hoc network wireless communication unit includes a Bluetooth module and / or a WIFI module, and the capacities of the capacitor groups are the same or different.

9. The low-voltage reactive power compensation intelligent control unit for a submerged arc furnace according to claim 4, Features The current of the vacuum contactor is less than or equal to 1600A.

10. The intelligent control unit for low-voltage reactive power compensation of a submerged arc furnace according to claim 4, Features Ad hoc network communication is performed between the ad hoc network wireless communication units of two or more ore-fired furnace low-voltage reactive power compensation intelligent control units within a predetermined distance.

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