The State Sequence Modules is mainly for satisfying demands of some special protective tests in power system. For example, for doing the tests of quick switching of power supply for station and automatic switch test of standby power supply ,many times reclosing of protective tester of distribution system.
The Modules is devided into ‘State series I’ and ‘State series II’, The ‘State series I’ outputs 4 phase voltage and 3-phase current, which can be applied for the serie of ‘VAE-430’ &“VAH-430”. ‘State series II’ outputs 6-phase voltage and 6-phase current, which can only be applied for ‘VAE-660’. The software functions and operating modes of two modules are basically the same.
During the state series tests, you can add up to nine states at most. In each state, you can define the voltage-current data and simulate state variety of complex electric network freely according to actual operation. Through reversal on seven pairs input, you can obtain and measure the action value and time of relay. Main interface of State Series I is as the figure shows left:
- Flexible controll nine state output at most. 4-phase voltage, 3-phase current or 12-phase voltage-current can be output in each state.
- Every state can be closed, increased, cancelled, inserted, named ,and set many kinds of trigger mode.
- Ux can set many kinds of output combination modes
- It can simulate all kinds of complex fault conveniently and flexible ,for testing complex logical combination.
Interface Instruction
Press the “+”、“-”button for increasing or deleteing current state. Nine states can be added at most. If adding new state,it will be added to default current state,the user can also add new state to suitable place in the dialog box ejected.
When you need to delete the state, please select this state by mouse (when certain state is in the current state, its title will be displayed in red characters), then press “-” button.
Option for ‘State output’
According to actual demand, you can jump over certain state through deleting the ‘√’ before this option. At that time, this state will be displayed in gray, and it won’t be included in the whole testing process.
Name of State
Since this testing module is always used for doing the ‘Reclosing and Post Acceleration’ test, the software has defined the names of five state defaulted :‘Before the Fault’, ‘Fault’, ‘After the Trip’, ‘Reclosing’ and ‘Permanent Trip’ in the pulldown menu of state for user’s selection. Users can also input the self-defining name of state directly in the blank according to requirement. The self-defining name of state won’t be setting in this pulldown menu, which can be changed at any time. The self-defining name of state involving in the test still exists when reopening this testing module.
State Parameters Setting
The AC parameters in every state can all be set freely, and the mode is the same as the ‘AC Test’. When simulating complex test, you can obtain it automatically through opening the function of ‘Short Circuit Calculation’ on the interface. The results can also be amended.
Ux Option for Every State
Ux is a special component, for which you can set several kinds of output forms:
Assuming the parameters are +3U0、-3U0、+×3U0、-×3U0, firstly combining current output UA、UB with UC to obtain 3U0 , then multiplying by corresponding coefficient to arrive at Ux .
If selecting to be equal to the voltage value of certain phase, then Ux output will be changed with the voltage change of this phase and always followe the change..
If selecting ‘Any Mode’, you can input any number in the range of 0~120 in the parameters column for Ux, and its value is equal to the voltage value and keep constant.
Time Trigger:
When this triggerring mode is selected, you can input respectively certain values in the ‘Longest State Time’ and ‘Time Delay after Triggerring’. During the test, it will enter next state after the abovementioned time delay. ‘Longest State Time’ stands for the longest output time in this state. Function of ‘Time Delay after Triggerring’ is similar to confirmation time of switch triggering in AC test module,which is be used for avoiding the error due to protective oscillation and usually it is set around 10ms. Please pay special attention that time delay can’ be set when simulating the faults of reclosing or post acceleration. Because the post acceleration fault causes by reclosing fault state, the post acceleration protection will act correctly only when it enters the Permanent Trip state e. If it output fault component during the period of ‘Longest State Time’, and also the ‘Input Trigger’ is selected to be the reversal condition of this state synchronously before the test, the tester will jump over the state of ‘Longest State Time’ left and get in the state of ‘Time Delay after Trigger’ when the tester receives the action signal of protection.
In addition, it often avoids the oscillation of protective contacts through setting ‘Time Delay after Trigger’.
Short Circuit Calculation
Click ‘Short Circuit calculation’ or press the button, then a ‘Short Circuit Calculation’ dialog box will be opened, which is used for simulating the short circuit calculations when all kinds of faults happen, and it will fill the calculated result in current state. You need to pay special attention to set correctly zero sequence compensating factor when it is earthing fault.
Conditions of State Reversing
Only the ‘Time Trigger’ and ‘Input Trigger’ can be selected synchronously, other states must be selected separately. They are preconditions of reversing from a state to next state.
Digital Trigger:
When this triggerring mode is selected, seven channels input A、B、C、R、a、b、c will all be effective. Relationship of these seven channels input is ‘or’, and you can cancel redundant input through deleting the ‘√’in front of it as required. When the tester tests action of the input selected, it will reverse to next state through the ‘Time Delay after Trigger’.
In order to avoid ‘Oscillation’ of contacts influencing the test, you should normally set certain ‘Time Delay after Trigger’ in this triggering way.
Key Trigger:
When the ‘Key Trigger’ is selected, during the test, click the button or press the ‘Tab’ key on tester’s front panel to realize the state trigger reversal . This is a kind of effective mode for controlling the test process by hand.
GPS Trigger:
When GPS trigger is selected, you can use minute impulse or second impulse of GPS clock to test several testers synchronously.
Notes
- The Time Trigger and Input Trigger could both be ticked at the same time, then the one whose condition arrives in advance will trigger the reversal.
- When the Switch Trigger is selected, normally certain ‘Time Delay after Trigger’ (about 5-20ms) needs to be set for avoiding reversal due to many times error trigger led by contact oscillation.
State of Digital Output
You can set the output state of digital output 1 or digital output 2 in each state. If you tick it as‘√’, so the output of this channel will be closed in this state; otherwise it will be opened. You can set different output of digital output in each state, which can implement switching variety of output during reversal in all state