SENTRON
Monitoring Devices
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10/2015
© Siemens AG 2016
© Siemens AG 2016
Siemens · 10/2015
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2Introduction
Monitoring devices for
electrical values
55SV8 residual current monitors
11 5TT3 voltage relays
19 5TT3 voltage and frequency relays
22 5TT6 current relays
27 5TT3 reverse power relays
28 5TT3 fuse monitors
29 5TT3 phase and phase sequence
monitors
31 5TT3 insulation monitors for industrial
applications
34 7LQ3 monitors for medical premises
Monitoring devices for plants and
equipment
53 5TT3 fault signaling units
55 5TT5 EMERGENCY STOP modules
57 5TT3 level relays
59 5TT3 line circuit relays
60 5TT3 p.f. monitors
62 5TT3 motor protection relays
Monitoring Devices
© Siemens AG 2016
2Siemens · 10/2015
Introduction
Monitoring Devices
■
Overview
Devices Page Application Standards Used in
Non-residential
buildings
Residential
buildings
Industry
Monitoring devices for electrical values
5SV8 residual current monitors 5To increase system availability and
operating safety through continuous
monitoring of residual current in
electrical systems and signaling if a
defined threshold is exceeded.
IEC 62020; EN 62020 ✓-- ✓
Modular residual current devices
(MRCD)
5The MRCD is a modular residual current
device type for personnel and fire
protection.
DIN EN 60947-2
(Appendix M),
IEC 60947-2
(Appendix M)
✓-- ✓
5TT3 voltage relays 11 Monitoring the voltage of emergency
lighting in public buildings, short-time
failures of 20 ms, for ensuring
operational parameters for devices or
system components or monitoring the
neutral conductor for breaks.
IEC 60255;
DIN VDE 0435-303;
DIN VDE 0108;
DIN VDE 0435;
DIN VDE 0633
✓-- ✓
5TT3 voltage and frequency relays 19 The voltage and frequency relay
monitors the status of the grid in the
case of in-plant generation systems.
Violation of an upper or lower limit
results in shutdown and disconnection
of the generation system from the grid.
This ensures a stable incoming supply
system.
IEC/EN 60255-1;
IEC/EN 61000;
VDE-AR-N-4105
✓ ✓ ✓
5TT6 current relays 22 Monitoring of emergency and signal
lighting and motors.
All current relays can be short-time
overloaded and connected either with
direct measurement or through
transformers.
IEC 60255;
DIN VDE 0435-303
✓-- ✓
5TT3 reverse power relays 27 Reverse power relays are used in power
supply systems, e.g. photovoltaic, wind
power, water power and unit-type
cogenerating stations, to control the
reverse power. They prevent voltage
being returned from the grid and
causing damage if the infeed system
itself fails or is damaged.
IEC 50255;
DIN VDE 0435-303
✓ ✓ ✓
© Siemens AG 2016
3
Siemens · 10/2015
Monitoring Devices
Introduction
5TT3 fuse monitors 28 Monitoring of all types of low-voltage
fuses.
Can be used in asymmetric systems
afflicted with harmonics and
regenerative feedback motors.
IEC 60255;
DIN VDE 0435
✓-- ✓
5TT3 phase and phase sequence
monitors
29 For the visual signaling of phase failures
or phase sequences in three-phase
systems.
The phase sequence is arbitrary.
The device is also suitable for
1, 2 or 3-phase operation.
IEC 60255;
DIN VDE 0435 -- -- ✓
5TT3 insulation monitors for
industrial applications
31 To increase system availability and
operating safety through continuous
monitoring of the isolation resistance in
non-grounded direct voltage or
AC voltage systems.
IEC 60255;
IEC 61557 -- -- ✓
7LQ3 monitors for medical
premises
34 For the insulation monitoring of a
medical IT system or load current
monitoring of an IT system transformer
for a non-permissible temperature rise.
Monitoring of the voltage supply with
automatic switchover.
EN 61557-8;
IEC 61557-8;
DIN VDE 0100-710;
IEC 60364-7-710
✓-- --
Monitoring devices for plants and equipment
5TT3 fault signaling units 53 Evaluation and display of fault alarms
and alarm signals for monitoring
industrial plants and control systems.
With 4 inputs and connections for
39 expansion fault signaling units.
IEC 60255,
DIN VDE 0435-303
✓-- ✓
5TT5 EMERGENCY STOP modules 55 For EMERGENCY-OFF switching in
accordance with the Directive 98/37/EC
on Safety of Machines. Safe types of
circuits for machines, plants or test
stations in industrial, commercial and
private enterprise applications.
According to the
Machinery Directive
98/37/EC; EN 954-1
✓-- ✓
Devices Page Application Standards Used in
Non-residential
buildings
Residential
buildings
Industry
© Siemens AG 2016
4Siemens · 10/2015
Introduction
Monitoring Devices
Devices Page Application Standards Used in
Non-residential
buildings
Residential
buildings
Industry
5TT3 level relays 57 Control of liquid levels in containers with
3 electrode connections for 1-step and
2-step level control. High immunity to
interference of the measuring circuit
isolated from the system.
IEC 60255,
DIN VDE 0435
✓-- ✓
5TT3 line circuit relays 59 For disconnecting the voltage of
unused lines when loads are disabled. IEC 60255,
DIN VDE 0435 -- ✓--
5TT3 p.f. monitors 60 For the monitoring of asynchronous
motors for underload and no-load
operation, e.g. fan monitoring in the
case of V-belt breakage, filter
blockages, pump monitoring in the
event of valve closure or dry runs.
IEC 60255,
IEC 61557 -- -- ✓
5TT3 motor protection relays 62 For the prevention of thermal motor
overloads, e.g. due to high switching
frequency, single-phasing, disabled
cooling or excessive ambient
temperatures.
With detection of wire breaks in the
sensor circuit.
IEC 60255,
DIN VDE 0435 -- -- ✓
© Siemens AG 2016
5
Siemens · 10/2015
Monitoring Devices
Monitoring Devices for Electrical Values
5SV8 residual current monitors
■
Overview
Plant and operating safety are becoming increasingly important
alongside the protection of personnel. Shutdowns due to the
unexpected tripping of protective devices cause high costs.
However, it is possible to detect residual currents in the electrical
installation before the protective device responds.
Residual current devices (RCD)
Residual current monitors (RCM) monitor residual current in
electrical installations and issue a signal when the residual
current exceeds a set value.
RCMs are used primarily in plants where a fault should result in
a signal, but not in disconnection. This enables plant operators
to detect faults and eliminate their causes before the protective
devices disconnect the installation, which increases plant and
operating safety and cuts costs.
Modular residual current devices (MRCD)
Modular residual current devices (MRCD) monitor residual
currents in electrical systems and trip the MCCB via a shunt or
UVR after an adjustable advance warning if the residual current
exceeds a defined value. See accessories for molded case
circuit breakers in Catalog LV 10, chapter "Molded case circuit
breakers".
This makes it possible for you to offer molded case circuit
breakers with personnel and fire protection in compliance with
EN 60947-2 (Appendix M) (also as a retrofit).
Summation current transformer
The summation current transformer detects all conductors
required to conduct the current, including the neutral conductor
where applicable. In a fault-free system, the magnetizing effects
of the conductors through which current is flowing cancel each
other out for the summation current transformer, i.e. the sum of
all currents is zero. If a residual current is flowing due to an
insulation fault, a residual magnetic field is left in the core of the
transformer and produces a voltage. This voltage is evaluated
using the electronics of the RCM/MRCD. The switched contact
can be used to operate an acoustic/optical signaling device, a
higher-level control system or a circuit breaker for example.
Time characteristic of the rated residual current
Ι
Δn
■
Benefits
• Higher plant availability and operating safety through
permanent monitoring of residual currents
• Adjustable limit values for residual current and response time
enable timely detection and signaling – plant shutdowns are
often avoidable
• Devices for every application:
The summation current transformers are available in various
sizes; the RCMs can be used optionally for signaling and/or
switching
• Additional fire protection can be implemented using the
monitoring system
100 %
n
50 %
t
n
n
Residual current
Time
Alarm
Disconnection
I202_16044
© Siemens AG 2016
6Siemens · 10/2015
5SV8 residual current monitors
Monitoring Devices
Monitoring Devices for Electrical Values
■
Technical specifications
1)
INS: Instantaneous, SEL: Selective.
5SV8000-6KK 5SV8001-6KK 5SV8200-6KK 5SV8101-6KK
Standards EN 62020, IEC 62020 DIN EN 60947-2
(Appendix M),
IEC 60947-2
(Appendix M)
Approvals UL --
Rated operational voltage U
e
V AC 230 230
from a 1-phase auxiliary
voltage source (also
externally)
• Frequency Hz 50/60
Rated residual current
Ι
Δn
•Type A A 0.03 ... 3 0.03 ... 3 0.03 ... 3 0.03 ... 3
(default setting: 30 mA)
•TypeAC A >3 5 ... 30 5 ... 30 --
Response time Δts0.02 ... 5 0.02 ... 10, INS, SEL
1)
0.02 ... 10, INS, SEL
1)
Ι
Δn
= 30 mA:
INS instantaneous
Ι
Δn
> 30 mA:
INS - SEL - 0,06 ... 10
1)
(default setting INS)
Relay contacts 1 × alarm 1 × pre-alarm,
1 × alarm 1 × pre-alarm,
4 × alarm 1 × alarm,
1 × tripping operation
• Rated voltage V AC 230 230 230 230
• Rated current A 6 6 6 6
Summation current transformer mm ∅20 ... 210 35 ... 210
Maximum cable length RCM/CT
(shielded cable) m10
Conductor cross-section mm
2
1.5 0.125 ... 2.08
Test/Reset Yes/Yes
External tripping operation/
external reset
--/Yes Yes/Yes Yes/Yes Yes/Yes
Mounting width MW 2 3 3 3
Degree of protection
• Contacts IP20
•Front IP41
Operating temperature °C -10 ... +50
© Siemens AG 2016
7
Siemens · 10/2015
Monitoring Devices
Monitoring Devices for Electrical Values
5SV8 residual current monitors
■
Dimensional drawings
Residual current monitor
5SV8101-6KK (approved configurations)
2 5SV8101-6KK
1 EN 60715 - TH35 - 7.5 35 - 15
55SV8702-0KK 35 mm 5SV8902-1KK
5SV8703-0KK 70 mm 5SV8903-1KK
5SV8704-0KK 105 mm 5SV8904-1KK
5SV8705-0KK 140 mm 5SV8905-1KK
5SV8706-0KK 210 mm 5SV8906-1KK
433
3VL17... 3VL9400-1ST00 3VL9400-1UP00
3VL27... 3VL9400-1ST00 3VL9400-1UP00
3VL37... 3VL9400-1ST00 3VL9400-1UP00
3VL47... 3VL9400-1ST00 3VL9400-1UP00
3VA20... 3VA9988-0BL30 3VA9908-0BB11
3VA21... 3VA9988-0BL32 3VA9908-0BB20
3VA22... 3VA9988-0BL33 3VA9908-0BB24
3VA9908-0BB25
3VA10... 3VA9988-0BL30 3VA9908-0BB11
3VA11... 3VA9988-0BL32 3VA9908-0BB20
3VA9988-0BL33 3VA9908-0BB24
3VA9908-0BB25
12
34
5
I201_18988
Standard DIN rail
Residual current device
Trip element
Molded case circuit breaker
Summation current transformer
1
2
3
4
5
RCM analog, 5SV8000-6KK RCM digital, 5SV8001-6KK, 5SV8200-6KK,
MRCD, 5SV8101-6KK
36
45
67
85
44
686
I202_116027
54 44
686
45
67
85
I202_16028
© Siemens AG 2016
8Siemens · 10/2015
5SV8 residual current monitors
Monitoring Devices
Monitoring Devices for Electrical Values
Summation current transformer
Summation current transformer, 5SV8700-0KK Summation current transformer, 5SV8701-0KK
Type Dimen-
sions
A B C D E F G
5SV8702-0KK 100 79 26 49 35 35 43
5SV8703-0KK 130 110 32 66 70 52 57
5SV8704-0KK 170 146 38 94 105 72 73
5SV8705-0KK 230 196 49 123 140 97 98
5SV8706-0KK 299 284 69 161 210 141 142
Type Rated current Maximum current
1)
5SV8700-0KK ≤ 40 A 240 A
5SV8701-0KK ≤ 63 A 380 A
5SV8702-0KK ≤ 80 A 480 A
5SV8703-0KK ≤200 A 1200 A
5SV8704-0KK ≤ 250 A 1500 A
5SV8705-0KK ≤ 500 A 3000 A
5SV8706-0KK ≤ 600 A 3600 A
1)
Transient starting current, up to max. 2s
Summation current transformer, 5SV8702-0KK, 5SV8703-0KK, 5SV8704-0KK,
5SV8705-0KK, 5SV8706-0KK
All active conductors (including the neutral) must be routed through the
transformer. Cables that are not routed through the transformer must keep
to a minimum clearance of 20 cm. Moreover, the transformers must have an
inside diameter that is at least 1.5 times larger than the outside diameter of
the conductors that pass through it.
Summation current transformer, 5SV8702-0KK, 5SV8703-0KK, 5SV8704-0KK,
5SV8705-0KK, 5SV8706-0KK
Ø46
Ø20
24 60
32 I202_16029
Ø59
Ø30
30 70
32 I202_16030
ØE
G46
6,5
B
F33
A
D
8
C
I202_16031
OK OKOK
OK
I201_19465
© Siemens AG 2016
9
Siemens · 10/2015
Monitoring Devices
Monitoring Devices for Electrical Values
5SV8 residual current monitors
■
Circuit diagrams
Residual current monitor
■
More information
Switch positions
RCM digital, 5SV8001-6KK:
RCM digital, 4 channels, 5SV8200-6KK
S/R = Set/Reset
LN
T1T2T3
1S1
1S2
1S1
1S2
T4
1S1
1S2
1S1
1S2
I202_16040a
Reset
Test
123456789
10 11 12 13 14 15
S/R
Alarm contact/alarm Trip contact/trip Alarm contact/alarm Trip contact/trip
Setting "Standard" "Standard" "+" "+"
Without power supply
With power supply
Over limit
CT disconnection
45
6
15 14
13
45
615 14
13
45
6
15 14
13
45
6
45
6
45
6
15 14
13
45
645
615 14
13
© Siemens AG 2016
10 Siemens · 10/2015
5SV8 residual current monitors
Monitoring Devices
Monitoring Devices for Electrical Values
RCM digital, 4 channels, 5SV8200-6KK:
Alarm contact/alarm Trip contacts/trip Trip contacts/trip
Setting "Standard" "Standard" "+"
Without power supply
With power supply
Over limit
CT disconnection
10 1C1: 14
C2: 14
C3: 8
C4: 8
C1: 13
C2: 15
C3: 7
C4: 9
C1: 14
C2: 14
C3: 8
C4: 8
C1: 13
C2: 15
C3: 7
C4: 9
10 1C1: 14
C2: 14
C3: 8
C4: 8
C1: 13
C2: 15
C3: 7
C4: 9
C1: 14
C2: 14
C3: 8
C4: 8
C1: 13
C2: 15
C3: 7
C4: 9
10 1C1: 14
C2: 14
C3: 8
C4: 8
C1: 13
C2: 15
C3: 7
C4: 9
C1: 14
C2: 14
C3: 8
C4: 8
C1: 13
C2: 15
C3: 7
C4: 9
10 1C1: 14
C2: 14
C3: 8
C4: 8
C1: 13
C2: 15
C3: 7
C4: 9
C1: 14
C2: 14
C3: 8
C4: 8
C1: 13
C2: 15
C3: 7
C4: 9
© Siemens AG 2016
11
Siemens · 10/2015
Monitoring Devices
Monitoring Devices for Electrical Values
5TT3 voltage relays
■
Overview
Voltage relays are used for device and plant protection,
supplying safety light devices and the detection of N-conductor
breaks and short-time voltage interruptions.
They are available as undervoltage, overvoltage and under /
overvoltage relays. The devices are equipped with different
functions, depending on their intended use, and comply with the
pertinent regulations.
■
Technical specifications
1)
For rated operational current.
5TT3400 5TT3404 5TT3406 5TT3194 5TT3195
5TT3401 5TT3405
5TT3402
5TT3403
Standards IEC 60255; DIN VDE 0435-110, -303
Rated operational voltage U
c
V AC 230/400 400
Operating range (overload capability) × U
c
1.1 1.35
Rated frequency Hz 50/60
Response values ON-switching × U
c
0.9/0.95 4 % hysteresis
OFF-switching 0.7/0.85 0.7 ... 0.95 0.9 ... 1.3
Minimum contact load V; mA 10; 100
Phase asymmetry Setting accuracy % -- Approx. 5 ... 10 -- Approx.
5...10
Repeat accuracy % -- 1-- 1
Phase failure detection At L1 or L2 or L3 ms 100 --
N-conductor monitoring -- Yes --
Rated insulation voltage U
i
Between coil/contact kV 4
Contacts μ contact (AC-11) A 4
Electrical isolation Creepage distances and
clearances
Actuator/contact mm 35.5
Rated impulse withstand voltage U
imp
Actuator/contact kV > 2.5 > 4
Terminals ± Screw (Pozidriv) 1
Conductor cross-sections
• Rigid, max. mm
2
2 × 2.5
• Flexible, with end sleeve, min. mm
2
0.5
Permissible ambient temperature °C -20 ... +60
Climatic withstand capability Acc. to EN 60068-1 20/60/4
5TT3196
Standards IEC 60255; DIN VDE 0435
Rated operational voltage U
c
V DC 24
Rated power loss P
v
• Coil/drive VA 0.6
• Contacts
1)
per pole VA 0.8
Hysteresis %4
Response values × U
c
• Undervoltage Undervoltage 0.82
• Overvoltage Overvoltage 1.18
Residual ripple tripping ΔU
c
Infinitely variable % 0 ... 15
Overload capability 33 V DC Continuous
35 V DC ms 500
45 V DC ms 10
Creepage distances and clearances mm 4
Rated impulse withstand voltage U
imp
Input/output kV > 2.5
Minimum contact load V/mA 24/300
Rated operational current I
e
AC-11 A 1
AC-1 A 4
Contacts μ contact
Electrical service life In switching cycles at I
e
5 × 10
5
Terminals ± Screw (Pozidriv) 1
Conductor cross-sections
• Rigid, max. mm
2
2 × 2.5
• Flexible, with end sleeve, min. mm
2
1 × 0.5
Permissible ambient temperature °C -20 ... +60
Climatic withstand capability Acc. to EN 60068-1 20/60/4
© Siemens AG 2016
12 Siemens · 10/2015
5TT3 voltage relays
Monitoring Devices
Monitoring Devices for Electrical Values
5TT3407 5TT3408 5TT3410
Standards IEC 60255; DIN VDE 0435-303
Rated operational voltage U
c
V AC 230/400
Operating range (overload capability) × U
c
1.1 1.35 1.2
Rated frequency Hz 50/60
Back-up fuse Terminals L1/L2/L3 A 2
Response values Overvoltage:
OFF-switching × U
c
-- 0.9 ... 1.3 --
ON-switching -- 4 % hysteresis --
Undervoltage:
OFF-switching × U
c
0.8 0.7 ... 1.1 --
ON-switching 0.85 4 % hysteresis --
Minimum contact load V; mA 10; 100
Phase asymmetry Setting accuracy % Approx. 5 ... 10
Repeat accuracy % 1
Phase failure detection At L1, L2 or L3 ms ≥ 20 100 --
OFF delay s-- 0.1 ... 20 0.1 ... 20
Automatic reclosing delay s0.2 ... 2 -- --
Rated insulation voltage U
i
Between coil/contact kV 4
Contacts μ contact (AC-11) A 3 1 4
Electrical isolation Creepage distances and
clearances
Contact/contact mm -- 4--
Actuator/contact mm 45.5
Rated impulse withstand voltage U
imp
Actuator/contact kV > 4
Rated operational power P
s
AC operation:
230 V and p.f. = 1 VA 2000 -- --
230 V and p.f. = 0.4 VA 1250 -- --
DC operation:
U
e
= 24 V and I
e
= 6 A W max. 100 -- --
U
e
= 60 V and I
e
= 1 A W max. 100 -- --
U
e
= 110 V and I
e
= 0.6 A W max. 100 -- --
U
e
= 220 V and I
e
= 0.5 A W max. 100 -- --
Terminals ± Screw (Pozidriv) 1
Conductor cross-sections
• Rigid, max. mm
2
2 × 2.5
• Flexible, with end sleeve, min. mm
2
0.5
Permissible ambient temperature °C -20 ... +60
Humidity class Acc. to IEC 60068-2-30 F
5TT3411 5TT3412 5TT3414 5TT3415
Rated operational voltage U
c
V AC 230 230/400
Overload capability × U
c
1.15 1.1 1.15
Rated frequency Hz 50/60
Response values ON-switching 2 % hysteresis 4 % hysteresis 5 %
OFF-switching × U
c
0.9 0.9 0.85
Minimum contact load V/mA 10/100
Phase failure detection At L1, L2 or L3 ms -- 100 500
N-conductor monitoring -- Yes --
Rated insulation voltage U
i
Between coil/contact kV 4--
Contacts AC-15 NO contacts 32--
AC-15 NC contacts 21--
AC-15 CO contacts -- 1 1 2
Electrical service life in switching cycles AC-15, 1 A, 230 V AC 5 × 10
5
1 × 10
5
Rated impulse withstand voltage Acc. to IEC 60664-1 kV 4 6
Pollution degree 2 2
Terminals ± Screw (Pozidriv) 2--
– Screw (slot) -- 3.5
Conductor cross-sections
• Rigid mm
2
2 × 2.5 1 x 4
• Flexible, with end sleeve mm
2
2 × 1.5 1 x 2.5
Permissible ambient temperature °C -20 … +60 -25 … +60
Climatic withstand capability Acc. to EN 60068-1 20/060/04
© Siemens AG 2016
13
Siemens · 10/2015
Monitoring Devices
Monitoring Devices for Electrical Values
5TT3 voltage relays
■
Characteristic curves
Timing interval of
5TT3400... 5TT3406
undervoltage relays
Timing interval of
5TT3410
N-conductor monitors
11-14
Uab
L1
L2
L3
Uc
11-12
Uab= Release value
I201_07033b
PEN conductor
interruption
N
C
11-14
11-12
I201_07516b
L1, L2, L3
Timing interval of
5TT3407
short-time relays
Timing interval of
5TT3408
under/overvoltage relays
t
v
: Adjustable automatic reclosing delay 0.2 to 20 s t: Adjustable OFF delay 0.1 to 20 s
The undervoltage relay switches at a phase asymmetry of approx. 6 to 8 %,
regardless of the response values for undervoltage. The above diagram
shows the timing interval for undervoltage or asymmetry.
The undervoltage relay switches at a phase asymmetry of approx. 6 to 8 %,
regardless of the response values for undervoltage. The above diagram
shows the timing interval for undervoltage.
0
11-14
11-12
T
0
v
t
v
t
v
t
v
t
c
U
11-14
11-12
I201_07271c
"RESET"
"RESET"
Response time
With fault
storage
Without fault
storage
Good signalGood signal
Good signal
Good signal
Response time
I201_07270b
11-14
11-12
On
t
UH
U
Off
On
Off
On
Off
>U
<U
<U
>U
tt
L1, L2, L3
LED
LED
LED
green
red
red
Hysteresis
Hysteresis
© Siemens AG 2016
14 Siemens · 10/2015
5TT3 voltage relays
Monitoring Devices
Monitoring Devices for Electrical Values
5TT3415 undervoltage relays 5TT3411 and 5TT3412 voltage relays
For characteristic curves of the 5TT3411 and 5TT3412 voltage
relays, see "Monitors for medical premises" from page 34.
■
Dimensional drawings
5TT34, 5TT3194 and 5TT3195 voltage relays
5TT34 undervoltage relays
5TT3196 DC voltage monitors
5TT3410 N-conductor monitors
5TT3411 and 5TT3412 voltage relays
For dimensional drawings of the 5TT3411 and 5TT3412 voltage
relays, see "Monitors for medical premises" from page
34.
Hysteresis
t>0.5s
LED green
LED yellow
t=1min
U
5TT3415
TEST
Us
L1, L2, L3
11-14
21-24
11-12
21-22 I202_01419
5TT3400
5TT3401 5TT3402
5TT3403 5TT3404
5TT3405
5TT3407
5TT3408
5TT3194
5TT3195
5TT3406
I201_11515
90
45
64
43
5
NL3L2L1
2212
21241114
12
1114
L1
L2L1
36
36
36
18
2212
21241114
NL3L2L1
2212
21241114
NL3L2L1
,B
/ /
1
/
/ /
1/
43
55
45
90
I201_06552
5
18
e+ f
23
11 12
24
L1 L2 L3 N
14 11 24 21
12 22
36 54364
45
90
I201_11516
© Siemens AG 2016
15
Siemens · 10/2015
Monitoring Devices
Monitoring Devices for Electrical Values
5TT3 voltage relays
■
Circuit diagrams
Graphical symbols
5TT34 undervoltage relays
5TT3414 5TT3415
5TT3411 and 5TT3412 voltage relays
For circuit diagrams of the 5TT3411 and 5TT3412 voltage relays,
see "Monitors for medical premises"
from page 34
.
Typical circuit for 5TT3195, 5TT340 voltage relays
1, 2, 3-phase operation against N
Typical circuit for 5TT3196 DC voltage monitors
5TT3194
5TT3195 5TT3402
5TT3403
5TT3404
5TT3405
5TT3406
5TT3407
5TT3408
5TT3410
5TT3196 5TT3400
5TT3401 5TT3414 5TT3415
N
L1 L2 L3 24 22
21
14 12
11
23
1224
11
e(+)
f
N
L1 L2 L3 14 12
11
N
11
L1 L2 L3 12 14
I202_01420
N
11 21
L1 L2 L3 12 14 22 24
I202_01421
11 12 14
21 22 24
11 12
14
L1
L3
L2 N
21 22
24
11 12 14
11 12
14
L1
L3
L2 N
N
L1 L2
L3
N
L1 L2
L3
I202_01415
14 12 24 22
11 21
I201_07594c
L1 L2 L3 N
L1 N
One-phase operation
14 12 24 22
11 21
I201_07595c
L1 L2 L3 N
L1 L2
Two-phase operation
14 12 24 22
11 21
I201_07596c
L1 L2 L3 N
L1 L3 L4L2
Three-phase operation
If 0.82 × U
c
is fallen short of, or 1.18 × U
c
exceeded, or if the residual ripple
is too high, the 11/12 contact closes and the 23/24 contact opens.
5TT3 196
L1
L2
L3
e+
f
I201_07274a
11
12
23
24
Load
24 V DC
23-24
11-12
c
c
1,18 x U
0,82 x U
I201_07035a
© Siemens AG 2016
16 Siemens · 10/2015
5TT3 voltage relays
Monitoring Devices
Monitoring Devices for Electrical Values
Typical circuit for
5TT3401, 5TT3403, 5TT3405
undervoltage relays
Typical circuit for
5TT3404, 5TT3405, 5TT3406, 5TT3408
under/overvoltage relays
One application of undervoltage relays is the switching to a safe power supply
after a fault.
Buildings are distinguished according to use, such as business premises,
exhibition areas or guest houses. These are all covered generically as
rooms/buildings "where people meet".
There is a fault if the voltage of the general power supply drops for 0.5 seconds
> 15 % in relation to the rated voltage (i.e. 195 V at 230 V).
In this case the lighting must be switched to a safety power supply after 0.5 to
15 s depending on the type of use. A safety power supply may be: a battery
system, a generating set or a quick-starting standby generating set.
These voltage relays can only be used for 3-phase operation. They
monitor not only under- and overvoltages in accordance with their
description, but also reverse voltage, asymmetry and N-conductor
breaks.
14 12 24 22
11 21
L1' L2' L3' N'
I201_07272d
L1 L2 L3 L4
K2
L1 L2 L3 N
K1
K1 K2
Emergency
power supply
Standard
power supply
Emergency
lighting
Standard
lighting
3 AC 230 V
L1 L2 L3 N
L1 L2 L3 N
K1
14 12 24 22
11 21
M
PE
Phase failure
I201_07273d
© Siemens AG 2016
17
Siemens · 10/2015
Monitoring Devices
Monitoring Devices for Electrical Values
5TT3 voltage relays
Typical circuit for
5TT3407 short-time relays Typical circuit for
5TT3407 short-time relays
In the case of sensitive technical sequences, it is often not possible to tell
whether this interrupt has interfered with the process sequence. The circuit
disconnects the power supply, which can then be switched back by using
the RESET pushbutton.
In simple cases, it may be sufficient for a short-time interruption to be
registered without the need to disconnect the power supply. In the case of a
short-time interruption, this is counted by the pulse counter. The pulse
counter can be reset if required.
14 12 24 22
11 21
I201_07597d
L1 L2 L3 N
L1 L2 L3 N
K1 K1
Reset
3 AC 230 V
14 12 24 22
11 21
L1 L2 L3 N
L1 L2 L3 N
1234
5TT3407 7KT5883
I201_07598d
Reset
230 V 3 AC
Typical circuit for
5TT3410 N-conductor monitors
L1
5TT3410
L2 L3
N
K1
L1
L2
L3
N
PE
F1
F2
F3
S1 F4 F5 F6
11
14
K1 I201_07517b
Test and
service
switch
© Siemens AG 2016
18 Siemens · 10/2015
5TT3 voltage relays
Monitoring Devices
Monitoring Devices for Electrical Values
■
More information
General voltage monitoring
For general device and plant protection, voltage relays with
switching thresholds of 0.7 × U
c
, i.e. 161 V are used. If they have
fixed, non-changeable switching thresholds, they switch back to
normal operation at 0.85 × U
c
, 195 V or at 0.9 × U
c
, 207 V,
depending on the version. If they have adjustable thresholds,
they switch back to normal operation with 4 % hysteresis, 9 V.
1, 2 or 3 phases to N or 3 phases to N
All voltage relays require an N-conductor. Devices for 1, 2 or 3
phases to N can be used for 1-, 2-, or 3-phase operation.
Devices for 3 phases to N require all three phases, whereby the
sequence in which they are connected is irrelevant.
Asymmetry detection
If different voltages occur in a three-phase network, this is called
phase asymmetry. Some voltage relays detect an asymmetry of
approx. 6 to 8 % of the phase-to-neutral voltage, i.e. approx.
14 to 16 V and switch off. This type of operation is used for
example to protect motors against a "skew".
N-conductor monitoring
An N-conductor break causes a skew, depending on the phase
load. In extreme cases, this could cause 400 V to be applied to
a phase and destroy the connected devices. Each voltage relay
with asymmetry detection is tripped by an N-conductor break, if
the phase displacement is at least 14 to 18 V.
The 5TT3410 N-conductor monitor detects a phase displace-
ment of 5 %, which is roughly 12 V. This provides earlier protec-
tion against overvoltage for connected devices. The N-conduc-
tor monitor does not react if the voltage drops or rises in all
phases simultaneously; or if a phase is swapped with the
N-conductor.
Reverse voltage detection
If a phase fails, the motors feed a reverse voltage to the missing
phase. However, voltage relays with reverse voltage detection
will disconnect in this case because they are monitoring the
phase angle.
Phase failure detection
If a phase fails completely, the voltage relays disconnect with a
delay as specified in the technical specifications.
Short-time failure detection
Short-time failures upwards of 20 ms cannot be detected with
conventional voltage relays. However, they can occur in the case
of system transfers or lightning strikes and can lead to
uncertainty for sensitive process sequences or measuring
procedures. The 5TT3407 short-time voltage relay has a reset
function that allows a procedure to be permanently interrupted
after a fault.
Back-up fuse
The voltage relays do not require a back-up fuse as device
protection. However, they are often installed in junctions, i.e. in
main supply systems with high fusing. In this case, the supply
lead to the voltage relay must be short-circuit resistant. The
back-up fuse only serves as line protection.
5TT3411 and 5TT3412 voltage relays
For control elements of the 5TT3411 and 5TT3412 voltage
relays, see "Insulation monitors for medical premises"
from
page 34.
5TT3
194
5TT3
195
5TT3
196
5TT3
400
5TT3
401
5TT3
402
5TT3
403
5TT3
404
5TT3
405
5TT3
406
5TT3
407
5TT3
408
5TT3
410
5TT3
411
5TT3
412
Overvoltage ✓✓✓-- -- -- -- -- -- -- -- ✓-- ✓ ✓
Undervoltage -- -- ✓✓✓✓✓✓✓✓✓✓-- -- --
Monitoring of safety light devices -- -- -- -- ✓-- -- -- ✓-- -- -- -- -- --
Monitoring of medical premises -- -- -- -- -- -- -- -- -- -- -- -- -- ✓ ✓
Monitoring of N-conductor -- -- -- -- -- -- -- -- -- -- -- -- ✓-- ✓
Monitoring of short-time interruptions -- -- -- -- -- -- -- -- -- -- ✓-- -- -- --
1, 2, 3-phase to N ✓-- -- ✓✓✓✓-- -- -- ✓-- -- ✓ ✓
3 phases to N -- ✓-- -- -- -- -- ✓✓✓-- ✓-- -- --
Asymmetry detection -- ✓-- -- -- -- -- ✓✓✓-- ✓ ✓ -- ✓
N-conductor monitoring -- -- -- -- -- -- -- ✓✓✓✓✓✓-- ✓
Reverse voltage detection -- ✓-- -- -- -- -- ✓✓✓-- ✓-- -- ✓
Short-time failure detection -- -- -- -- -- -- -- -- -- -- ✓-- -- -- --
Phase failure detection -- -- -- ✓✓✓✓✓✓✓✓✓-- -- ✓
Switching thresholds: -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
0.7/0.9 × U
c
, non-adjustable -- -- -- ✓-- ✓-- ✓-- -- -- -- -- -- --
0.8/0.85 × U
c
, non-adjustable -- -- -- -- -- -- -- -- -- -- ✓-- -- -- --
0.85/0.95 × U
c
, non-adjustable -- -- -- -- ✓-- ✓-- ✓-- -- -- -- -- --
0.7 ... 0.95 × U
c
, 5 % hysteresis, adjustable -- -- -- -- -- -- -- -- -- ✓-- -- -- -- --
0.7 ... 1.1 × U
c
, 4 % hysteresis, adjustable -- -- -- -- -- -- -- -- -- -- -- ✓-- -- --
0.9 ... 1.3 × U
c
, 4 % hysteresis, adjustable ✓✓-- -- -- -- -- -- -- -- -- ✓-- -- --
Adjustable time delay -- -- -- -- -- -- -- -- -- -- -- ✓-- -- --
Contact: 1 CO -- -- -- ✓✓-- -- -- -- -- -- -- -- -- --
Contact: 2 CO ✓✓-- -- -- ✓✓✓✓✓✓✓✓-- --
Contact: 1 CO, 1 NO, 1 NC -- -- -- -- -- -- -- -- -- -- -- -- -- -- ✓
Contact: 1 NO, 1 NC -- -- ✓-- -- -- -- -- -- -- -- -- -- -- --
Contact: 2 NO, 2 NC -- -- -- -- -- -- -- -- -- -- -- -- -- ✓--
© Siemens AG 2016
19
Siemens · 10/2015
Monitoring Devices
Monitoring Devices for Electrical Values
5TT3 voltage and frequency relays
■
Overview
The voltage and frequency relay monitors the status of the grid
in the case of in-plant generation systems. Violation of an upper
or lower limit results in shutdown and disconnection of the
generation system from the grid. Connection or automatic re-
connection of the generation system to the grid only takes place
when the grid frequency and the grid voltage have remained
within their respective tolerance ranges without interruption for
the duration of an adjustable time delay t
W
. Following shutdown
due to a brief interruption, re-connection takes place when the
grid frequency and grid voltage have remained within the
tolerance range for 5 s without interruption.
■
Benefits
• Clearance certification of the German Employer's Liability
Association (Energy, Textile, Electrical and Media Products)
• Default settings in accordance with VDE-AR-N-4105
• The voltage and frequency relay meets the high requirements
of VDE AR-N 4105
• It can be used both for centralized and integrated grid and
plant protection
• The latching rotary switches enable fast and easy setting of
the required values
• An illuminated LCD display provides plant status information
• The voltage and frequency relay ensures single-fault
tolerance as stipulated in the VDE-AR-N 4105 application
guide
• Passive procedure for detecting islanding
■
Application
Enable via external contact
Enable using external voltage 24 V AC, 40 ... 400 Hz
I202_02440
Coupling switch 1
Coupling switch 2
3-phase
Safe external
disconnection,
e.g. via ripple
control receiver
CG = clock-pulse generator
Inverters
Generator(s)
Generation system
Low-voltage
system
CG 2CG 1
L1
L2
L3
N
L1 L2 L3 N 11
12
Q1
KA
KE
Q2
14 22 24 32 34
21 31
X1
B1
B2
X2
Coupling switch 1
Coupling switch 2
enabled disabled
CG =clock-pulse generator
external CG
Inverters
Generator(s)
Generation system
Low-voltage
system
CG 2
L1
L2
L3
N
L1 L2 L3 N 11
12
Q1
KA
KE
Q2
14 22 24 32 34
21 31
X1
B1
(+) (-)
B2
X2
I202_02441
© Siemens AG 2016