Anti-interference electricity circuit

Abstract

The utility model discloses an anti-interference electricity circuit, which relates to the technical field of anti-interference electricity, and is characterized in that a first output contact of an anti-interference electricity module is connected in parallel with two ends of a normally open self-holding contact of a working relay KA; the working relay KA is connected with frequency conversion equipment; a second output contact of the anti-interference electricity module is connected in parallel with two ends of a normally open contact of the relay KA1; the relay KA1 is electrically connected with the DCS background; a third output contact of the anti-interference electricity module is connected in parallel with two ends of a normally open contact of the relay KA3; the relay KA3 is electrically connected with the frequency converter; the working power supply of the anti-interference electricity module is electrically connected with the L / N end of the control power supply; the anti-interference electricity modules are connected in parallel, so that the control of the original line is not influenced and the original line is not changed no matter the equipment is put in or withdrawn; the circuit is not only suitable for a power frequency control scene, but also can be applied to a frequency conversion control scene, and one module can meet the anti-interference electricity requirement of a plurality of relays.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-electrical shaking, in particular to an anti-electrical shaking circuit. Background Art

[0002] With the advancement of modernization, a large number of frequency conversion equipment have been used in industrial production for energy-saving considerations. Various low-voltage complete power supply and distribution equipment manufacturers have developed a large number of frequency conversion control cabinets. Their control schematics are similar. For example, the more common low-voltage complete cabinet frequency conversion control circuit is Figure 1 . In this control circuit, its working mode is to use the conversion switch of the on-site operation column to realize the local and remote switching control. When in the local position, the control power supply is connected in sequence: the normally closed contact of the stop button, the local conduction contact of the conversion switch, the normally open contact of the start button, the frequency conversion conduction contact of the control cabinet conversion switch, the normally closed contact of the DCS stop relay, and finally the control relay KA coil. When the start button is closed, the power will be sent to the KA coil, so that the KA relay is activated, the normally open contact of KA is closed, and the coil of the KA3 relay is connected. The normally open contact of the KA3 relay is closed, and the inverter receives the start command and starts working. When the stop button is pressed, the power supply circuit of the KA relay coil is interrupted, the relay returns, the normally open contact of the KA relay is disconnected, the power supply of the coil of the KA3 relay is interrupted, the normally open contact of the KA3 relay is disconnected, the start-up operation signal of the inverter is interrupted, and the inverter stops working. By analogy, it can be found that this circuit can realize various combined working modes such as local and remote control of frequency conversion equipment, frequency conversion, and industrial frequency operation, which can meet the conventional needs of on-site production.

[0003] However, with the development of society, factory production has put forward higher control requirements for equipment control. At present, the construction of a large number of centralized industrial parks has concentrated various types of power loads, greatly increasing the probability of fault shocks in the power grid system, and power grid shaking occurs from time to time. In the process of use, we found that some on-site inverter start-stop control, signal interlocking, etc. are mostly controlled by intermediate relays. Once the power grid shakes, the intermediate relay will trip. Even if the power grid recovers quickly, it will be chained and stopped due to signal interruption. However, the unexpected shutdown of some key or important equipment will cause safety hazards or cause greater economic losses. In order to ensure that the equipment can continue to operate stably and keep the signal continuous, we currently use anti-sway power supply modules. When the power shakes, the coil power is provided by the anti-sway power supply module. After the power shake ends, the power module automatically charges.

[0004] However, this method can only be used in series wiring. When the power module fails, the main control circuit will inevitably be disconnected, causing the inverter to shut down for reasons not related to itself. In addition, when replacing the module, the equipment needs to be shut down and the equipment operation needs to be interrupted for replacement. At the same time, this type of product is only for equipment controlled by a single relay. Utility Model Content

[0005] In view of the deficiency of the prior art that only series wiring can be adopted in application, the utility model provides an anti-electrical shaking circuit to solve the problem in the prior art that when the electric shaking power supply module fails, the main control circuit will inevitably be disconnected, causing the inverter to shut down for reasons not attributable to itself, and the equipment needs to be shut down when replacing the module, and the operation of the equipment needs to be interrupted for replacement.

[0006] An anti-power-sway circuit, comprising: an anti-power-sway module with multiple sets of output dry contacts, a control power supply, a working relay KA, a DCS and a frequency converter;

[0007] The first contact of the anti-power-shaking module is connected in parallel to the two ends of the normally open self-holding contacts of the working relay KA;

[0008] The second contact of the anti-electrical shaking module is connected in parallel to the two ends of the normally open contact of the relay KA1 connected to the DCS;

[0009] The third contact of the anti-electrical shaking module is connected in parallel to the two ends of the normally open contact of the relay KA3 that controls the operation of the inverter;

[0010] The working power supply of the anti-electrical shaking module is electrically connected to the L / N terminal of the control power supply.

[0011] Furthermore, the fourth contact of the anti-electrical shaking module is electrically connected to a status indicator light.

[0012] Furthermore, the fifth contact and the sixth contact of the anti-electrical shaking module are both electrically connected to the passive normally open contact of the working relay KA.

[0013] Furthermore, a fuse FU1 is connected between the working power supply of the anti-power-shaking module and the control power supply.

[0014] Furthermore, the model of the anti-electrical shaking module is ARD-KHD.

[0015] Furthermore, the model of the frequency converter is ACS580.

[0016] The utility model provides an anti-electrical shaking circuit, which has the following beneficial effects:

[0017] The utility model adopts the anti-electrical shaking module ARD-KHD, which is internally controlled by a digital chip and has all the functions of a power module. It can output multiple sets of dry contacts at the same time. By adopting the parallel wiring method, no matter whether the equipment is put into or withdrawn, it will not affect the original line control and will not change the original line. It has higher reliability and good versatility. One module can meet the anti-electrical shaking requirements of multiple relay control circuits.

[0018] The anti-electrical shaking module outputs a dry contact with an anti-electrical shaking function, which is connected in parallel to the relay contacts that need to be maintained to achieve the self-holding function of the intermediate relay, the uninterrupted start signal of the inverter, and the unlost backstage running status.

[0019] The use of dry contacts effectively avoids the capacity limitation problem of conventional power modules, expands its application scenarios, completely replaces the coil self-holding function, reduces the complexity of on-site construction, and is connected in parallel, with high reliability and simple maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a power frequency / variable frequency dual-purpose control circuit diagram of a frequency conversion device;

[0021] Figure 2 This is a dual-purpose control circuit diagram of an anti-sway power frequency / converter frequency conversion device in the utility model;

[0022] Figure 3 This is the contact wiring diagram of the anti-electrical shaking module ARD-KHD in the utility model. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] See also Figure 2-3 , the technical solution provided by the utility model:

[0025] At present, for a large number of key frequency conversion equipment, the realization of simple control functions can no longer meet the needs of on-site production. The current refined control requirements have put forward higher reliability and stability requirements for electrical control; the frequency conversion control anti-shaking circuit is mainly an improvement on the conventional frequency conversion control circuit.

[0026] The utility model starts from the selection of components and the convenience of on-site use and maintenance, and optimizes the original control circuit. The anti-swaying technology adopts the power module mode. Generally, its internal circuit is mostly analog circuit, and the control principle is relatively simple. The use of the power module is limited by the output capacity and can only serve one relay. At present, an anti-swaying module ARD-KHD has been re-selected from the market. It adopts digital chip control inside and has all the functions of the power module. It outputs multiple groups of dry contacts at the same time and adopts parallel wiring. Regardless of whether the equipment is put into or withdrawn, it does not affect the original line control and does not change the original line. It has higher reliability and good versatility. One module can meet the anti-swaying requirements of multiple relays. The optimized new control circuit is to output the dry contact with anti-swaying function through the module itself, and connect it in parallel to the relay contact that needs to be maintained to realize the self-holding function of the intermediate relay, the inverter start signal is not interrupted, and the background feedback operation status is not lost. The use of dry contacts circumvents the problem of capacity limitation of the power module, expands its application scenarios, completely replaces the self-holding function of the coil, and is connected in parallel, with high reliability and simple maintenance.

[0027] An anti-sway circuit, the specific wiring method is as follows Figure 2 As shown, the ARD-KHD module is connected in parallel to the control circuit, including an anti-electrical shaking module, a control power supply, a working relay KA, a relay KA1 and a relay KA3; the first output contact 40 / 41 of the anti-electrical shaking module is connected in parallel to the two ends of the normally open self-holding contact of the working relay KA; the working relay KA is connected to the frequency conversion equipment; the second output contact 42 / 43 of the anti-electrical shaking module is connected in parallel to the two ends of the normally open contact of the relay KA1; the relay KA1 is electrically connected to the DCS background; the third output contact 44 / 45 of the anti-electrical shaking module is connected in parallel to the two ends of the normally open contact of the relay KA3; the relay KA3 is electrically connected to the frequency converter; the working power supply 11 / 14 of the anti-electrical shaking module is electrically connected to the L / N end of the control power supply; one end of the fourth group of output contacts 46 / 47 of the anti-electrical shaking module is electrically connected to the L end of the control power supply, and the other end is connected in series to the module status indicator light, and the module status indicator light is electrically connected to the N end of the control power supply. Adding the module status indicator light can timely detect whether the module is working normally.

[0028] The fifth output contact 30 and the sixth output contact 32 of the anti-electrical shaking module are both electrically connected to the passive normally open contacts of the working relay KA. A fuse FU1 is connected between the working power supply of the anti-electrical shaking module and the control power supply. The model of the anti-electrical shaking module is ARD-KHD, and the model of the inverter is ABB ACS580.

[0029] The working principle of the anti-power-shake module ARD-KHD is to keep the switch contact state in the motor self-holding circuit unchanged, the motor DCS background feedback signal unchanged, and the inverter running input state unchanged when the detection equipment is in operation and a temporary voltage drop occurs. Once the power is restored, it can work normally. Therefore, its wiring method is:

[0030] 1. The working power supply 11 / 14 terminals take the L / N of the control power supply.

[0031] 2. The closing status and operation signal of the device are connected to the passive normally open contact of the working relay KA, and the internal power supply of the anti-electrical shaking device is taken from the common terminal 39 of the device.

[0032] 3. The module output has four groups in total. Output contact 1 is connected in parallel at both ends of the KA normally open self-holding contact. Output contact 2 is connected in parallel at both ends of the DCS operation status feedback KA normally open contact. Output contact 3 is connected in parallel at both ends of the inverter operation relay KA3 normally open contact (the auxiliary normally open contact of KA3 controls the inverter operation). Normally open output 4 is connected to the status indicator light to monitor the module output status.

[0033] Set appropriate switching voltage according to specific electrical equipment to ensure that it is triggered and turned on within the time that the equipment can withstand; reasonably set the fuse as a maintenance bypass in the control circuit, disconnect the fuse during maintenance, and remove the wiring terminals of the anti-electrical sway device to shut down the anti-electrical sway device, thus eliminating the impact of anti-electrical sway equipment failure on the operating equipment.

[0034] After wiring according to the above principles, the output status of the anti-electrical shaking module, the equipment operation relay KA and the control voltage sampling waveform are synchronously connected to the oscilloscope to compare and analyze its action sequence and response speed. After a large number of experiments on site, it was detected that the return voltage of the relay with a rated voltage of 220V is in the range of 90-130V. The anti-electrical shaking is put into the preparatory state to collect the operation status of the start relay for judgment. The electric shaking judgment criterion is the control voltage alone. Considering the output lag of the anti-electrical shaking equipment, the voltage judgment criterion is set to less than 180V, and the anti-electrical shaking exit judgment criterion is 200V. The voltage change is controlled by the relay protection instrument, and the oscilloscope collects the control voltage waveform, the module status output and the working relay status for comparison and analysis. After the electric shaking, the switching time can be controlled within 20ms. During normal shutdown, the control voltage remains unchanged and the anti-electrical shaking equipment does not act, which meets the needs of on-site equipment operation and achieves the expected effect.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An anti-power-shaking circuit, characterized in that: include: With an anti-power-shaking module with multiple sets of dry contacts for output, a control power supply, working relays KA, KA1 and KA3; The first output contact of the anti-power-shaking module is connected in parallel to the two ends of the normally open self-holding contact of the working relay KA; the working relay KA is electrically connected to the frequency conversion device; The second output contact of the anti-power-shaking module is connected in parallel to the two ends of the normally open contact of the relay KA1 connected to the DCS; the relay KA1 is electrically connected to the DCS backstage; The third output contact of the anti-power-shaking module is connected in parallel to the two ends of the normally open contacts of the relay KA3 that controls the operation of the frequency converter; the relay KA3 is electrically connected to the frequency converter; The working power supply of the anti-electrical shaking module is electrically connected to the L / N terminal of the control power supply.

2. The anti-power-shaking circuit according to claim 1, characterized in that: One end of the fourth group of output contacts of the anti-electrical shaking module is electrically connected to the L end of the control power supply, and the other end is connected in series with the module status indicator light, and the module status indicator light is electrically connected to the N end of the control power supply.

3. The anti-power-shaking circuit according to claim 1, characterized in that: The fifth output contact and the sixth output contact of the anti-electrical shaking module are both electrically connected to the passive normally open contact of the working relay KA.

4. The anti-power-shaking circuit according to claim 1, characterized in that: A fuse FU1 is connected in series between the working power supply of the anti-electrical shaking module and the L end of the control power supply.

5. The anti-power-shaking circuit according to claim 1, characterized in that: The model of the anti-electrical shaking module is ARD-KHD.

6. The anti-power-shaking circuit according to claim 1, characterized in that: The model of the frequency converter is ABBACS580.

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