2. Change of drawdown parameters of current protections of mp3c-

05.

Set on the checkout console voltage of 60 V on phases А, В, C. Increase smoothly current la on the console of minimal value of drawdown 1 CT MT3 (drawdown console 1 CT MT3 takes place after lightening of light-emitting diode D.l on the MP3C-05). Fix on display of MP3C-05 in the menu CHANGES current value of protection actuation I_CP

Decrease la until switching off of Dl. Fix on the MP3C-05 in the menu MEASUREMENTS value of protection return current I_B. Set current Phase A to minimal value. Calculate the formula return on current protection

Calculate according to the formula accuracy of current protection actuation

Similar measurements are performed for the currents lb, Ic. These measurements and calculations should be tabulated into a table 2.

Table 2

№	Cascade MT3	Phase	1у (А)	1ср (А)	1в (А)	К HI	8,. %
1.	MT31	A	2,7
2.	MT32	A	2,8
3.	MT33	A	2,9
4.	MT31	В	2,7
5.	MT32	В	2,8
6.	MT33	В	2,9
7.	MT31	С	2,7
8.	MT32	С	2,8
9.	MT33	С	2,9

Compare K_H], 8, with permissible values from table 1.

Check the operation of the functions assigned to the digital inputs:

• S I AT BE MTZ1 on DV7;

• STAT BE MTZ2 on DV7;

• STAT BL MTZ3 on DV7.

To do this, select the row Diskret INPUTS, press ENTER, and then DV07 - INVERTED

Increase the current in any phase up to 3 A. Make sure that the emptying to all levels of MTZ block.

3. Check of maximal voltage protection (зНмах).

1. Parameters set of maximal voltage protection (зНмах).

Go to the menu of MP3C-05 device, select program module CONFIGURATION and set:

• 311 -Turn in.

Another types of protection are turn off.

Sequentially choose program modules 3H, SETTING and, relieve INPUTS, OUTPUTS COM, INDICATION and set:

• SETTING:

• MAX. VOLTAGE - 30,0 B;

• RESTRAINTS:

• RESTRAINTS U_MAkc - 0,1 c;

• CONTROL:

• PROTECTION Umakc - TURN ON;

• SETTING

• OUTPUT COM:

• P05 - ACTUATION U_Makc~ TURN ON;

• INDICATION:

• СДИ4 - ACTUATION U_MAkc - TURN ON;

Select in the program module SETTING row УВВ and push button INPUT.

Select row INDICATION and push button INPUT, set:

• СДИ4- NORMAL;