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TD_MRN3-3_08.06_GB

35

6.4 Secondary

injection

test

6.4.1 Test

equipment

•

Voltmeter and frequency meter with class 1 or better,

•

auxiliary power supply with the voltage correspond-
ing to the rated data indicated on the type plate,

•

three-phase voltage supply unit with frequency regu-
lation (Voltage: adjustable from 0 to 2 x U

N

; Fre-

quency: adjustable from 40 - 70 Hz),

•

timer to measure the operating time
(accuracy

±

10 ms),

•

switching device and

•

Test leads and tools

6.5 Example of test circuit

For testing of the

MRN3-3

relay, a three phase volt-

age source with adjustable voltage and frequency is
required. Figure 6.1 shows an example of a three-
phase test circuit where three phase voltages are ap-
plied to the relay in Y-connection.

~

=

MRN1

Versorgung

Supply

Versorgung

Supply

L+/L L-/N

C9

E9

D9

Extern Reset

External Reset

Blockiereingang

Blocking Input

L+/L

C8

L-/N

D8

L+/L

E8

N
G
P

N
G
P

Serielle Schnittstelle

Serial Interface

Selbstüberwachung

Selfsupervision

f

df/dt

U

Warnung / Anzeige

Alarm / Indication

Auslösen

Trip Signal

D1
C1
E1

D2
C2
E2
D4
C4
E4
D5

D6

C5

C6

E5

E6

A3

U1E

U2E

U3E

D7
C7
E7

~

~

~

V

1

Timer

4

Start

-

-

+

Stop

+

2

3

A5

A6

A7

A8

A4

5

L1

L2

L3

N

DQ

Figure 6.1: Three-phase test circuit

For testing the vector surge function of the relay, a test
circuit which can produce phase angle change (vector
surge) is required to simulate mains failures (please re-
fer to chapter 6.5.6).

For testing the df/dt function of the relay, a special test
configuration is required, which produces a constant
rate of change of frequency.

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Содержание HighTECH Line MRN3-3

Страница 1: ...MADE SIMPLE MAINS DECOUPLING RELAY WITH DF DT AND PROGRAMMABLE UNDERVOLTAGE CHARACTERISTICS HighTECH Line MAINS DECOUPLING RELAY WITH DF DT AND PROGRAMMABLE UNDERVOLTAGE CHARACTERISTICS Original docum...

Страница 2: ...etting parameters for under voltage characteristics 5 4 2 SYMmetrical ASYMmetrical or GENEral faults 5 4 3 Permissible release time for the under voltage characteristic curve 5 4 4 Plausibility check...

Страница 3: ...ns 6 5 4 Checking the operating and resetting values of the over underfrequency functions 6 5 5 Checking the tripping delay of the over underfrequency functions 6 5 6 Checking the vector surge functio...

Страница 4: ...been applied for the first time in protection technique is of enormous use for the accu rate identification and analysis of the grid state as demanded by the rules General Note For further technical d...

Страница 5: ...ccording to re quirement By applying the auxiliary voltage to D8 E8 the previously set relay functions are blocked refer to 4 8 and 5 7 1 3 1 3 Reset input Please refer to chapter 5 9 1 3 1 4 Output r...

Страница 6: ...cordings are chosen the relevant num ber of partial segments is reserved in the complete memory If the memory is full a new recording will always write over the oldest one Thus the fault recorder can...

Страница 7: ...t curve 1 warn Display shows no TRIP trip Display shows TRIP Char1 U 1 1 Char point_value 1 voltage value V 1 U Start 2 U Start Char1 U 1 t 1 Char point_value 2 not parameterisable s 0s fixed Char1 U...

Страница 8: ...voltage element V 1 200 1 460 4 800 tU2 U2 t Tripping time of the 2 nd voltage element s 0 04 290 U3 Function of the 3 rd voltage element U undervoltage U overvoltage U3 Pick up value of the 3 rd vol...

Страница 9: ...P2 and RS min and max are two coloured The LEDs on the left side next to the alphanumerical display light up green during measur ing and red during fault message The LEDs below the push button SELECT...

Страница 10: ...ompo nents caused by fault induced transients or other system disturbances The microprocessor continuously com pares the measured values with the preset thresholds stored in the parameter memory EEPRO...

Страница 11: ...generators consumers or electrical operating equip ment in general against over or underfrequency The relay has three independent frequency elements f1 f3 with individually adjustable parameters with...

Страница 12: ...protects the generator by tripping the generator circuit breaker in case of mains failure b Mains parallel operation and isolated single operation For this application the vector surge supervision tr...

Страница 13: ...verfunctions MRN3 3 should be connected separately to the busbar 4 7 Measuring principle of vector surge supervision When a synchronous generator is loaded a rotor dis placement angle is build between...

Страница 14: ...stable reference time and from this the deviation of the cycle duration of the voltage signal is ascertained In case of a vector surge as shown in fig 4 8 the zero passage occurs either earlier or lat...

Страница 15: ...st load change causing a vector surge and trips the mains C B For detecting high resistance mains failures a minimum current relay with an adjustable trip delay can be used A trip delay is needed to a...

Страница 16: ...ased Instantaneously released released instantane ously released after 1 s Released after 5 s released after 5 s 3 supply voltage is switched on blocked for 200 ms blocked for 200 ms blocked for 1 s b...

Страница 17: ...value in seconds SELECT RESET one time for each value Char1 U 5 Char1 U 5 t Permissible release time for under voltage limit curve 1 Setting value in seconds SELECT RESET one time for each value Char...

Страница 18: ...tive function Voltage threshold value for the frequency vector surge and df dt measurement setting value in Volt SELECT RESET f df Slave address of serial interface 1 32 SELECT RESET RS Baud Rate 1 12...

Страница 19: ...rameter the transformation ratio of the VT has to be set accordingly If the parameter is set to sec the measuring value indicated on the dis play is shown as rated secondary voltage Example The voltag...

Страница 20: ...or f 60 Hz The different designations f or v have no influence on any of the other functions All frequency functions are determined by setting the nominal frequency i e whether the set frequency thres...

Страница 21: ...order Figure 5 3 Function of digital inputs With the settings SET1 or SET2 the parameter set is acti vated by software Terminals C8 D8 and D8 E8 are then available as external reset input or blocking...

Страница 22: ...rts as soon as the failure occurs A fault in cident is detected when the voltage is below the threshold value U start and it will be stopped as soon as the voltage range U 5 had been exceeded At the m...

Страница 23: ...and the MRN3 3 detects a symmetrical fault then tripping will be blocked ALL means general fault If this function is assigned to an under voltage characteristic and the MRN3 3 de tects a fault then t...

Страница 24: ...marked accordingly in red 5 4 4 Plausibility check of the voltage characteristic The setting points are not independent from each other It is therefore recommended to parameterise them in ascending o...

Страница 25: ...value adjusted at T alarm is given and after the tripping delay of the frequency element has elapsed the tripping command is given The setting range for T is between 2 99 Recommendation for setting Fo...

Страница 26: ...ation Switching off and on of loads approx 20 of the nominal generator capacity must trip the relay Later in normal isolated operation the tripping of the relay is inhibited b In mains parallel operat...

Страница 27: ...ault recorder see chapter 3 1 5 Three parameters can be determined 5 5 1 Number of the fault recordings The max recording time is 20 s at 50 Hz or 16 66 s at 60 Hz The number of max recordings request...

Страница 28: ...can be changed and with ENTER be saved 5 6 Adjustment of the clock When adjusting the date and time LED lights up The adjustment method is as follows Date Year Y 00 Month M 00 Day D 00 Time Hour h 00...

Страница 29: ...how ever only in the assignment mode The assignment mode can be reached only via the blocking mode By pressing push button SELECT RESET in blocking mode again the assignment mode is selected The LEDs...

Страница 30: ...U1 t tripping X 1 _ _ _ U1 green t red U2 alarm X _ _ _ 4 U2 green U2 t tripping X 1 _ _ _ U2 green t red U3 alarm X _ _ _ 4 U3 green U3 t tripping X 1 _ _ _ U3 green t red f1 alarm X _ _ _ 4 f1 green...

Страница 31: ...ositive and negative df dt values occur but they do not cause any tripping due to the special measuring method These min max measurements are of great advan tage for long time analysis of the grid qua...

Страница 32: ...time the pa rameter set that is active at the occurrence is shown By pressing SELECT RESET the fault measuring values can be scrolled By pressing it can be scrolled back to a more recent fault data se...

Страница 33: ...of a protection function The display can only be reset when the pickup is not present anymore otherwise TRIP remains in display During resetting of the display the parameters are not affected 5 9 2 Er...

Страница 34: ...ternal blocking input terminals E8 D8 to inhibit the undervoltage functions and press the SELECT RESET for app 3 s to reset the LEDs and TRIP message 6 2 Testing the output relays and LEDs PLEASE NOTE...

Страница 35: ...t where three phase voltages are ap plied to the relay in Y connection MRN1 Versorgung Supply Versorgung Supply L L L N C9 E9 D9 Extern Reset External Reset Blockiereingang Blocking Input L L C8 L N D...

Страница 36: ...ent of the input signals the har monics will be rejected by the internal DFFT digital fil ter Whereas the RMS metering instrument measures the RMS value of the input signals 6 5 2 Checking the operati...

Страница 37: ...ckup values f1 f3 to EXIT For testing the pickup and dropout to pickup values the test frequency has to be increased decreased until the relay is energised This is indi cated by lighting up of LEDs f1...

Страница 38: ...hase angle obtained may be calculated with the following formula and is almost independent on the test voltages In case of a 3 phase vector surge the angle can be calculated with the following formula...

Страница 39: ...t Generally a primary injection test could be carried out in the similar manner as the secondary injection test described above With the difference that the pro tected power system should be in this c...

Страница 40: ...f 99 96 f 100 04 Dropout time 60 ms Time lag error class index E 10 ms Minimum operating time 40 ms Max allowed interruption of the auxiliary supply without a facting the function of the device 50 ms...

Страница 41: ...har 2 warn trip Voltage characteristics Char1 Char2 U Start Un 100 V EXIT 1 200 V Un 230 V EXIT 1 460 V Un 400 V EXIT 4 800 V Un 690 V EXIT 4 800 V 1 V 1 V 2 V 2 V 1 from setting value or 0 3 of UN U...

Страница 42: ...from setting value or 0 3 of UN tU 5 U 5 t tU 4 60s 0 02 0 06 1 00 0 05 1 00 2 00 0 1 2 00 5 00 0 2 5 00 10 0 0 5 10 0 20 0 1 20 0 50 0 2 50 0 60 1 related to the measured value of volt age resp 30 m...

Страница 43: ...50 01 70 Hz1 40 59 99 EXIT 60 01 80 Hz2 0 01 30 0 48 0 0 1 48 0 52 0 0 01 52 0 70 0 0 01 40 0 58 0 0 1 58 0 62 0 0 01 62 0 80 0 0 04 Hz 1 or 20 ms f1 t f3 t tf min 3 290 s EXIT 0 02 0 06 1 00 0 05 1 0...

Страница 44: ...recorder Function Parameter Adjustment example FR Number of recordings 1 x 20 s 1 2 x 10 s 3 4 x 5 s 7 8 x 2 5 s 50 Hz 1 x 16 66 s 1 2 x 8 33 s 3 4 x 4 16 s 7 8 x 2 08 s 60 Hz FR Saving of the record...

Страница 45: ...ision 1 step and vector surge 1 step Rated voltage 100 V Utilities Substation main substation 230 V direct connection without transformers 400 V direct connection without transformers 690 V direct con...

Страница 46: ...ristic 1 warn U 1 1 Char point_value 1 V 45 104 180 310 1 Char point_value 2 not changeable s U 2 2 Char point_value 1 V 45 104 180 310 U 2 t 2 Char point_value 2 s 0 16 U 3 3 Char point_value 1 V 70...

Страница 47: ...or frequency measuring Periods 4 f1 Pick up value for the 1 st frequency step Hz 48 00 f1 t Tripping delay of the 1 st frequency step s 0 1 f2 Pick up value for the 2 nd frequency step Hz 47 50 f2 t T...

Страница 48: ...l settings Default settings Actual settings Default settings Actual settings Char 1 cycle running Char 1 trip alarm X Char 2 cycle running X Char 2 trip alarm X U1 alarm X U1 t tripping X U2 alarm X U...

Страница 49: ...function X Code jumper Low High range for Reset input Low High range for blockage input Default settings Actual settings Default settings Actual settings Low plugged X X High not plugged All settings...

Страница 50: ...47884 Kempen Germany Telephone 49 0 21 52 145 1 Internet www SEGelectronics de Sales Telephone 49 0 21 52 145 331 Fax 49 0 21 52 145 354 E mail info SEGelectronics de Service Telephone 49 0 21 52 145...

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