CS207977B1 - Connection of the emergency control of the switch - Google Patents

Abstract

Vynález se týká zapojení nouzového ovládání spínače, zejména vypínače velmi vysokého napětí s provozním elektrickým ovládáním stejnosměrným proudem, tvořeného nejméně jednou vypínací cívkou. Přitom je s vypínací cívkou sériově zapojen samočinný přerušovač elektrického vypínacího impulsu, mající polohu závislou na poloze hlavních kontaktů spínače a spínací zařízení pro: připojení vypínací cívky na provozní zdroj stejno- ί směrného proudu. Do obvodu provozního elek- i trického ovládání, majícího první část před vypíná-! cí cívkou a druhou část za vypínací cívkou, jsou i v prvé části před vypínací cívkou sériově za! spínacím zařízením pro připojení vypínací cívky na provozní zdroj stejnosměrného proudu zapojeny blokovací kontakty. Až dosud se pro nouzové ovládání spínačů v případě poruchy provozního zdroje stejnosměrného proudu pro provozní elektrické ovládání používalo přímého uvolnění ovládací energie. U spínačů ovládaných tlakovým vzduchem if používalo ručního otevření ventilu, u spínačů ovládaných mechanický nastřádanou Energii ruční- the I uvolnění střádače vyražením volnoběžky prostřednictvím Tahla Lanka nebo drátu, u spínačů ovládaných hydraulicky ručního přesunutí šoupátka. Nevýhodou popsaného nouzového ovládání spí načů bylo, že při velkých vzdálenostech jednotlivých pólů spínače velmi vysokého napětí bylo nemožné dosáhnout dostačující současnosti funkce tří pólů třípólového spínače, potřebné pro jeho schopnost přerušovat třífázový proud. Při vypínání nebylo pak možno ani při dostatečné zásobě ovládací energie přerušovat třífázový proud procházející hlavním obvodem spínače. Toto přerušení bylo nutno nejdříve provést jiným spínačem, například ve vzdálené rozvodně a teprve pak uskutečnit nouzové spínání spínače. Uvedené nevýhody odstraňuje vynález jehož podstata spočívá v tom, že nouzový zdroj stejnosměrného proudu je připojen na zdroj střídavého napětí spínačem, opatřeným zámkem. Budicí cívka elektricky ovládaného spínače je zapojena paralelně k jeho nejméně dvěma párům zapínacích kontaktů, z nichž jeden pár je zapojen k obvodu provozního elektrického ovládání v jeho druhé části za vypínací cívkou a za samočinným přerušovačem. Každý další pár zapínacích kontaktů je k zapojen obvodu provozního elektrického ovládání v jeho části prvé před vypínací cívkou mezi spínacím zařízením pro připojení vypínací cívky na Provozní zdroj stejnosměrného proudu to vypínací cívkou, před samočinným přerušovačem.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to an emergency switch control circuit, in particular a very high voltage circuit breaker with a DC operating electrical control comprising at least one trip coil. In this case, an automatic trip circuit breaker having a position dependent on the position of the main contacts of the switch and a switching device for: connecting the trip coil to a direct current operating source is connected in series with the trip coil. Into the operating electrical circuit having the first part before tripping ^! and the second part after the tripping coil are in series in the first part before the tripping coil! the blocking contacts are connected by a switching device for connecting the trip coil to the DC power supply.

Until now, direct release of control energy has been used for emergency switch operation in the event of a failure of the DC power supply for operational electrical control. Manual valves were used for compressed air-operated switches, switches operated by mechanically accumulated energy of manual release of the accumulator by punching freewheel by means of a rod, cable or wire, and switches controlled by hydraulically manual slide movement.

The disadvantage of the described emergency switch operation was that at long distances of the individual poles of the very high voltage switch it was impossible to achieve a sufficient simultaneous function of the three poles of the three-pole switch required for its ability to interrupt the three-phase current. When switching off, the three-phase current passing through the main circuit of the switch could not be interrupted even with sufficient supply of control energy. This interruption had to be done first with another switch, for example in a remote substation, and only then with emergency switch operation.

These drawbacks are overcome by the invention in that the emergency DC power supply is connected to the AC power supply by a switch provided with a lock. The excitation coil of the electrically actuated switch is connected in parallel to its at least two pairs of make contacts, one pair of which is connected to the operational electrical control circuit in its other part downstream of the trip coil and after the breaker. Each additional pair of make contacts is connected to an operational electrical control circuit in its first portion upstream of the trip coil between the trip device for connecting the trip coil to a DC power source and the trip coil, upstream of the automatic breaker.

Each additional pair of closing contacts of the electrically operated switch may be connected to an operational electrical control circuit in its first portion between the blocking contacts and the automatic breaker.

Each trip coil can be associated with one pair of make contacts of the electrically operated switch.

An example of a practical embodiment of the emergency control wiring is shown in the attached drawing where a switch with three trip coils is shown.

The DC operating circuit 1 comprises three trip coils and three trip breaker electrical breakers associated therewith having a position dependent on the position of the main contacts 4 of the unclosed switch. The circuit 1 of the operating electrical control with trip coils 2 is connected to the DC power source 5 formed by the accumulator battery 6 by a switching device 7, for example a button 8 or an automatic fault-protection automatics. The blocking contacts 9 are connected in series to the operational electrical control circuit 1 behind the switching device 7. The blocking contacts 9 are connected in the first part 14 of the operational electrical control circuit 1 upstream of the trip coils 2, the operating electrical circuit 1 having a second part 15 downstream The emergency DC power supply 10, consisting of the rectifiers 11 in Graetz connection and the smoothing capacitor 12, is supplied from an AC power source 13. The emergency stop electrical pulse switching device comprises an electrically operated switch 16 with an excitation coil 17, a pair of make contacts 18 and 19, and a switch 20 provided with a lock. The switch lock 20 may be any device that requires tools to be released, such as a latch lock or a screwed cover. A locked switch 20 is connected between the emergency DC power supply 10 and the AC power source 13

Claims (3)

SUBJECT 1. Connection of an emergency switch control, in particular a high-voltage circuit breaker with operational electrical control of direct current, comprising at least one trip coil with a trip circuit breaker having a position dependent on the position of the main contacts of the switch a DC power supply, in which blocking contacts are serially connected to the operational electrical control circuit, with an emergency direct current source, an AC power source and an emergency trip pulse switching device consisting of an electrically actuated excitation coil switch with at least two pairs of make contacts; from a switch provided with a lock, the operating electrical control circuit having a first blocking voltage portion. An electrically operated switch 16 is also connected between the emergency DC power supply 10 and the operational electrical control circuit 1 so that its excitation coil 17 is connected in parallel to; contact pairs 18 and 19. Contact pair 19 is! connected at node 21 to the second portion 15 of the circuit and one electrical control for operating the trip coil 2 and the third automatic breaker ¹ Kon stroke pairs 18 are joined at the nodes 22 to the first portion 14 of the circuit 1 operating electric control between interlocking and tripping contacts 9; coils 2 in front of automatic breakers 3. If the voltage of the DC power supply 5 is lost, the emergency power supply 10 can be connected after the control supply has been checked and the lock has been released; a direct current, consisting of rectifiers 11 and a smoothing capacitor 12 per AC power source 13. The excitation coil 17 of the electrically actuated switch 16 is connected to the rectified voltage, thereby changing the position of the make contacts 18 and 19 connected in parallel to the excitation coil 17 to the on state. The tripping pulse is opened via the automatic and interrupters 3 ^! to the trip coils 2, thereby enabling the main contacts 4 of the switch to be switched off in the same way: simultaneous switching of the individual poles as in I tripping with the switching device 7 from the DC power supply 5 at node 22 between blocks; With the help of the contacts 9 and the automatic breaker 3, j enables the main contacts 4 of the switch ί to be switched off without current load even when the blocks are open! 9. ί The emergency switch control circuit according to the invention can be used in the emergency control l of high, very high electrical switches | and particularly high voltage, operably controlled by direct current. OF THE INVENTION, the contacts in front of the trip coil and the second part behind _; a trip coil, characterized in that both the emergency power supply and the direct current (10) are connected to an AC power supply (13) by a switch (20) provided with a lock and the excitation coil (17) of the electrically operated switch (16) is connected in parallel to its at least two pairs of make contacts (18, 19), of which one pair of make contacts (19) is connected to the circuit (1) of the operational electrical control also in its second part (15) after the trip coil (2) and behind (3) and each additional pair of make contacts (18) is connected to the circuit (1); (14) in front of the trip coil (2) between the switching and closing device (7) for connecting the trip coil (2) to the DC power supply (5) and the trip coil (2) upstream of the breaker (3) ) · 2. The emergency switch control circuit as set forth in claim 1, wherein each additional pair of make contacts (18) of the electrically operated switch (16) is connected to the operational electrical control circuit (1) in its first portion (14) between the block contacts (187977). 9) and automatic interrupter (3) · 3. Emergency switch control connection according to claim 1, characterized in that each trip coil (2) is associated with one pair of make contacts (18) of the electrically operated switch (16).