Grid is the quasi- period generator excitation in Canada (the load voltage) case, in strict accordance with the grid conditions ( ie the same frequency , voltage magnitude and phase of the same , the same phase sequence ) to the grid . Circuit works Commonly used quasi- grid circuit with the moon rotating light law and network circuits , dark lamp method and network circuits and the whole grid- step table method, several circuits , as shown in Figure 5-164 . Commonly used quasi- grid circuit with the moon rotating light law and network circuits , dark lamp method and network circuits and the whole grid- step table method, several circuits , as shown in Figure 5-164 . Dark lamp method and run the generator from the network circuit Gl, when the grid generator G2, and network control knife switch Q, the same period in light HLl-HL3 and zero voltage meter PV component . HLl-HL3 were received and the network to be turbines and generators have been running the corresponding phase power supply system , the zero value voltage meter and the PV can be connected to the HLl-HL3 in either a light. Rotary light law and also by the network and network control circuit knife switch Q, has been running generators Gl, when the grid generator G2, the same period in light HLl-HL3 and zero voltage meter PV component . With the dark lamp method and circuit network different is that only HLl be directly received and net generation units and power generators have been running the system corresponding to the L3 phase , while HU and HL3 be received and net cross- hairTurbine generator sets and power supply system has been running on both sides , which uses light to reflect the speed of rotation of the frequency difference Gl and G2 Size. Step table method and the whole network of circuit step by the whole table ( a special use for the generator and network synchronization instruction sheet, use or control plate installed in the same screen ), and network control knife switch Ql, has been running Fadianjizu Gl Until the grid generators G2 and frequency table Hzl, Hz2, voltmeter PVl, PV2 composition . Dark lamp method and network using the circuit should be adjusted to be net generators G2 and speed , when HLl-HL3 are off , PV instructed to 0, Q can be connected , switch on the grid . Method using rotating light grid circuit should be adjusted to be net generators G2 and speed , when the PV direction for the O, HLl out , HL2 and HL3 same brightness , you can switch on the grid . With the dark lamp method and network circuits compared to the grid circuit rotating light method to overcome the same period when the lights do not light up in low voltage shortcomings . Step table method and the whole network circuits have the wiring simple, easy to install and observation and so on. In use, the entire step table pointer as generators when the grid frequency and has been running G2 generators Gl and change the frequency . Gl G2 was higher than the frequency when the frequency, the pointer to point to " fast " direction of rotation; when the frequency of less than Gl G2 's frequency, the pointer point to the "slow" direction of rotation . Adjust the speed of G2 , G2 and Gl when the frequency , voltage line , the whole step table table needle from the slow direction of the fast Slow rotation, about the middle of zero means that the dial position ( that is synchronized position , usually marked with a red or black line ), you can be connected to Ql, switch on the grid . Components Selection The circuit knife switch Q ( or Ql, Q2) should be the power grid generator and load power use . Rotating light circuit and method , and nets dark lamp method and network circuits HLl-HL3 were used 220V, l0-60W incandescent bulb ; PV use 0-5OV AC voltmeter . Whole -step table and network circuits used PVI and PV2 AC 0-400V voltmeter ; Hzl and Hz2 use 45-55Hz frequency table ; whole step table used generators and network -specific synchronization index table .