Technical exchanges talk about the secondary loop control of high-voltage vacuum circuit breakers sink into the source material plant) their own views.
In 2004, in the reconstruction of the raw material field of the new ironworks, a 10kV high distribution room was built in the electric project, and 28 sets of middle-mounted high-voltage cabinets were installed. The models were KY28-12 cabinets equipped with VS vacuum circuit breakers and used microcomputer integrated protection. (LN 3001 is a comprehensive protection device. Each SSS device is connected to a background controller and can be operated by a duty room computer. The high voltage part is designed by Changsha Metallurgical Electric Power Design Institute. The working principle of the control circuit is as follows: When the handcart is in the test position, S is connected, and the 1KK switch on the cabinet can be used to perform the sub-switching and closing. After the handcart is pushed to the working position, S8 is broken and S is switched on. At this time, if 1Z is selected on the “device operationâ€, the split and closing circuit of the comprehensive protection device is switched on (device 12-closing; 13-breakdown) 18-protection) can be operated by the background computer; selected in the "non-device operation", will be controlled by the cabinet 1KK switch, closing 2ZK allows the PLC's KHKT control.
Line anti-trip principle: When closing, the circuit breaker normally open auxiliary point 1QF is closed, in order to prepare for the sub-gate circuit, if there is a sub-breaker letter breaking. The TJ contact will close the closing circuit, turn on the TBJ voltage coil, and the TB ground pressure coil will self-hold, and the closing circuit will not work.
The outlet relay circuit is used to cut off the closing circuit to prevent jumps; and in the circuit, it is the second problem of every operation and the second problem is that the intermediate jumper relay TB assists, and then closes the circuit breaker. In any case, the closing circuit is shut off once. To prevent, normally open contact closure makes the resistance R in series into the open circuit, from the figure to see the purpose of jump.
1 Obviously, there is no essential difference between the anti-jump functions of the two: the lishingHouse.Allrights only after closing the command signal (such as 1KK switch) TBJ voltage coils only lose power to recover, effectively prevent the circuit breaker moments and minutes Repeated actions.
The author put forward his own two points of view on the control circuit: 1. The VS1 circuit breaker itself has an anti-jumping device. Compared with the anti-jump relay TB on the map, how can we choose which one to use and which one is more reasonable? In the loop, there is the action of the TBJ contact on the resistor R, and the role of the resistor R and the capacitor 2C in the circuit. The first problem, the author consulted the information about the circuit breaker, if you choose the circuit breaker's own anti-jump device (The device itself has anti-hop coil) The control circuit can be modified as shown below, anti-skipping principle is as follows: When the circuit breaker is closed, its auxiliary normally open contact 1QF is closed, so that the anti-trip relay TB coil is energized, point action , Cut off the closing circuit and self-hold. At this point, regardless of whether there is no opening action, the closing circuit is cut off by the anti-trip relay TBJ and cannot be closed again. Until the closing command is released, the TBJ is reset.
Anti-jump effect. Relatively speaking, the circuit is simpler, and the anti-jump principle is more intuitive and understandable, which is easier for the maintenance electricians to understand and master, and the cost of the jump-proof relay TJ is also lower.
So, how do we choose the two control lines? The author thinks that the two types of anti-skid control circuits should be chosen according to the situation, and each has its own advantages and disadvantages. Line 1 plug-in anti-trip relay, signal expansion is good, according to the different types of relay selection, can achieve different control effects. Line 2 itself has anti-jump device, the line is simple and easy to grasp, but there are few changes in control, and it is more suitable for lines with integrated protection devices. Under the premise of having a microcomputer integrated protection device, both lines can be selected. However, if there is no comprehensive protection device, the over-current coil of the circuit breaker itself needs to be overloaded and short-circuit protected, and there may be other protection outlets. The coordination of the relays is needed to select the line 1 more appropriate (ie, optional) so that different The purpose of control is to transform the selection of TB male electronics to achieve the desired control requirements.
To sum up, users can choose according to their own needs. The author's preferred anti-jump control method is relatively simple in terms of principle and wiring, and because our high-voltage cabinet has comprehensive protection, the raw material plant has finally chosen Control line.
34 Reasons and preventive measures for the unwinding of bundled wire after several passes The main reason is that it occurs in the export wire. Due to the large number of loading and unloading times, it is decided to change it to 8 bundles for special reasons. This means that each bundling head must be tied twice, and the weight cylinders controlling the payoff rack must be opened twice. Since the normal bundling was previously done once, the procedure must be modified (ports shown) 4 Concluding remarks After the prevention and treatment of the above aspects, the surface bruising caused by the baling of the varieties of steel wire rods can be eliminated, making the baling machine of the high-wire factory meet the baling requirements of the diversified products of the high-line plant and better service. At the same time, we should be soberly aware that due to the narrowness of the finishing site and the acceleration of the production rhythm, it has brought great pressure to the high-liner baler, the existing baling speed. Often unable to keep up with the rhythm of production, with the increase in the production capacity of high-line plants, it is bound to affect the production of high-line, how to improve the speed of binding will be a new topic of our research and analysis.
(Continued from page 27) Effect. For this reason, after consulting relevant information, the author believes that the role of resistance R is: If there is a signal relay XJ in the loop of the protection outlet relay KCO (see). If the protection action, signal relay XJT can not effectively drop the card, it is divided by the 1QF; string resistor R, it can make the XJ coil self-sensing potential to effectively release, play a freewheeling role, thus ensuring reliable XJ out brand. If the signal relay model 5, the internal resistance is 07n; DX-11/1, the internal resistance is 02; DX-8, the internal resistance is 02A, so the choice of resistance to meet the above requirements. However, the circuit also has its drawbacks. When the TBJ voltage coil cannot be self-protected, the resistance R is serially and time-limited. There is now a circuit for replacing the resistor R with another current coil (damper coil) of the anti-trip relay TBJ (see) This current coil enables the contact to be self-retained until the self-induction potential of the XJ coil drops to a zero point released.
VSi vacuum circuit breaker trip coil TQ in the case of DC220V, its power is 198W current 09A coil resistance 2444. With jumper relay TBJ line schematic TBJ anti-jump relay According to the above situation Optional: DZB-284/220V/05A Its The winding form is one each for current operation, current holding and voltage holding winding.
Microcomputer integrated protection device has strong functions, protection and alarm are all relatively perfect. The signal relay protection circuit in China is not suitable for use in the microcomputer integrated protection device circuit, because all protection signals can enter the comprehensive protection device without using signal relay. However, if there is no microcomputer integrated protection device, it is necessary to use the circuit breaker's own overcurrent coil as protection, and other protection outlets need serial signal relays for alarm and lockout purposes. Therefore, the resistor R and the capacitor 2C in the circuit can be completely omitted, and will not affect the loop operation.
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