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INVENTION
Russian Federation Patent RU2074474
COMPENSATION OF REACTIVE POWER DEVICE
Name of the inventor: Slavin Georgy
The name of the patentee: Slavin Georgy
Address for correspondence:
Starting date of the patent: 1994.05.16
The invention relates to electrical engineering and can be used in substations with a shunt capacitor banks. In order to improve the reliability of operation of the device by reducing the autonomous voltage on the capacitors and on the switch when the device is provided with a logic unit and the sensor capacitor bank off of the fact. The logic unit is configured to connect to the input control switching of the switching power source apparatus in the presence of two signals at its input from the aforementioned sensors, and the sensor fact disable shunt capacitor bank is designed as a series-connected reactor and resistor chance occurrence for signal outputs at zero current through capacitor bank and its derivative.
DESCRIPTION OF THE INVENTION
The invention relates to electrical engineering, in particular to a device for reactive power compensation in a network of high-voltage AC, and may be used in substations with shunt capacitor banks (WRD).
A device for reactive power compensation, comprising a standard network switch in the circuit shunt capacitor bank.
The disadvantage of this solution is the high overvoltage when disconnecting capacitors and as a consequence, the circuit failures.
A device with a capacitive compensation resistor shunt one pole switch.
The disadvantage of this solution is the need razzemleniya neutral WRD to eliminate phase-to-ground loop without a resistor if you disable the 2nd and 3rd phase of the WRD, which requires additional insulation neutral and switching device in neutral. In addition, if you disable the 2nd phase has a phase-phase loop without a resistor.
Known bypass switch circuit capacitor battery varistor to reduce overvoltage when disconnected.
The disadvantage of this solution is the complexity of the circuit breaker due to the creation of a second it contacts the system to turn off the varistor. Avoiding the use of auxiliary contacts leading to a substantial increase in the varistor current loads and reduce its effectiveness.
Known and surge suppression device when disconnecting capacitor banks, consisting of a resistor and a switch connected in parallel capacitor bank prior to its shutdown capacitor discharge in a time of 0.01 seconds. This solution is the most close to the proposed and therefore taken as a prototype.
Disadvantages of the prototype are the lack of autonomy of action and the high cost associated with the installation of an additional circuit breaker with a nominal voltage equal to the voltage WRD.
The aim of the invention is to improve the reliability of the device due to the autonomous reduction of the voltage across the capacitor and the switch is turned off when WRD.
This object is achieved in that the device for reactive power compensation, comprising a shunt capacitor bank (WRD) with a switch in its circuit a and shutiruyuschy resistor connected in parallel to at least one capacitor of said battery through the switching device with the control input of switching further comprises a logic unit, and sensor disconnection fact WRD and said switching control input of the switching device in the chain of a shunt resistor is connected to a power source through a power circuit logic unit, the control inputs of which are connected to the outputs of said sensor inputs are included in the chain of WRD. Wherein the sensor fact disable WRD may be configured as a series-connected reactor and longitudinal resistor the resistance of which at 50 Hz roughly equal and much smaller than the resistance WRD two input logical block configured according to the scheme and may be connected to the sensor output and its third input with the point of connection of the reactor and longitudinal sensor resistor; power input logic block chains can be connected to a source of DC voltage or to a capacitor WRD.
The invention is explained in Figures 1 and 2.
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1 and 2 are shown WRD capacitors 1 and 2 switch that connects them with the object of high voltage 3 and 4 and a resistor, shunt capacitors WRD 1 in the circuit which included a high-speed switching device 7, connected to the sensor 5 off WRD fact that may be formed as a series connected resistor 8 and a reactor 9, a logic unit 6, to supply energy to the high speed switching control input of the switching device 7 after disconnection WRD. The essence of the invention is that the inclusion of the phase supply signal on the resistor 4 and its incorporation WRD performed after disconnection phase, allowing kondensatopov shunt portion. In the prototype of the bypass capacitors to disable WRD would lead to an almost instantaneous rise in the voltage of the capacitor Non-bypassed. Turning WRD resistor after switching off and allows to reduce the resistance of the resistor, and hence the discharge capacitor shunted. |
When the WRD instantaneous current and voltage sensors through it do not match. Fast switching device 7 is turned off in this mode.
From the moment trip WRD current through the WRD and the voltage across the reactor is proportional to the derivative of the current, are equal and are equal to zero, which can serve as a reliable and, most importantly, faster signal of WRD disable fact, than the signal from the auxiliary contacts switch 2.
The switching device 7 connects the shunt resistor 4, which may be relatively low impedance resistor, unlike in the prior art, since the proposed device is turned on after disconnection resistor WRD and not beforehand.
The logic unit 6 connects the control input of the switching device 7 at the coincidence of instantaneous values of the current through the WRD and its derivative with each other and with zero. The resistance shunt resistor R 4 is chosen from the condition
t 5 + t 6 + t 7 + RC <0,01 s,
where C is the capacity of the WRD shunted;
t 5, t 6 and t 7 while the blocks 5,6 and 7.
If a shunt battery by the third 220 kV 52 MVA, when R 300 ohm, RC 3,4 ms.
Since the current through the WRD may be terminated not only as a result of tripping WRD, but also in other modes, such as K.3. if you disable the object 3, the asynchronous course (if WRD will be in the center of the electrical system), may require an additional entrance to the logic unit 6 to communicate with the relay protection of power facilities. Any trip signal WRD must first enable circuit via a logic block or absence of this signal is to block its action.
Fast switching device 7 can be made thyristor, vacuum or gas-insulated, ie without moving parts and with the ability to self-repair of dielectric strength. Fast work by using a vacuum or gas-chambers is provided an electric ignition spark gap. The point of connection to the shunt resistor 4 WRD determined permissible insulation voltage switching device 7.
Blocks 1-5 are located on the open switchgear, and for placing the blocks 6 and 7 may be required indoors. Therefore, the jumper between the blocks 4 and 7 must be carried out with the cable insulation, the corresponding voltage at the connection point of the resistor 4 to the WRD. Jumper blocks between 5 and 6 must be made with cable rated voltage not higher than 1 kV.
The apparatus may be implemented as a combination of capacitors in a star WRD and in conjunction with their triangle.
CLAIM
1. A device for reactive power compensation, comprising a shunt capacitor bank (WRD) with a switch in its circuit and a shunt resistor connected in parallel to at least one capacitor of said battery through the switching device with a control input and turning on a power source, characterized in that it is provided with a logical and the sensor unit battery disconnection fact, the logic unit is adapted to connect to the switching control input of the switching power source apparatus in the presence of two signals at its input from said sensor inputs are included in the circuit WRD.
2. Device according to claim. 1, characterized in that the sensor tripping WRD fact designed as a series-connected resistor and a reactor with the possibility of occurrence of signals on the output at zero current through the WRD and its derivative.
3. Apparatus according to claim. 1, characterized in that as the energy source used source of DC voltage.
4. The apparatus of claim. 1, characterized in that as the energy source used WRD capacitor.
print version
Publication date 15.02.2007gg
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