Technical data

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Function overview

Description

Siemens SIP · 2008

12 Motor Protection / 7SK80

12/9

Protection functions

•

Time-overcurrent protection

(50, 50N, 51, 51N)

•

Directional overcurrent protection, ground

(67N)

•

Sensitive dir./non-dir. ground-fault

detection (50Ns, 67Ns)

•

Displacement voltage (64)

•

Inrush restraint

•

Motor protection

– Undercurrent monitoring (37)

– Starting time supervision (48)

– Restart inhibit (66/86)

– Locked rotor (14)

– Load jam protection (51M)

•

Overload protection (49)

•

Temperature monitoring

•

Under-/overvoltage protection (27/59)

•

Under-/overfrequency protection (81O/U)

•

Breaker failure protection (50BF)

• Phase unbalance or negative-sequence

protection (46)

• Phase-sequence monitoring (47)

• Lockout (86)

Control functions/programmable logic

• Commands for the ctrl. of CB, disconnect

switches (isolators/isolating switches)

• Control through keyboard, binary

inputs, DIGSI 4 or SCADA system

• User-defined PLC logic with CFC

(e.g. interl.)

Monitoring functions

•

Operational measured values V, I, f

•

Energy metering values W

, W

•

Circuit-breaker wear monitoring

•

Minimum and maximum values

•

Trip circuit supervision

•

Fuse failure monitor

•

8 oscillographic fault records

•

Motor statistics

Communication interfaces

•

System/service interface

– IEC 61850

– IEC 60870-5-103

–PROFIBUS-DP

–DNP3.0

–MODBUSRTU

•

Ethernet interface for DIGSI 4

•

USB front interface for DIGSI 4

Hardware

•

4 current transformers

•

0/3 voltage transformers

•

3/7 binary inputs (thresholds

configurable using software)

•

5/8 binary outputs (2 changeover/

Form C contacts)

•

0/5 RTD inputs

•

1 live-status contact

•

Pluggable current and voltage terminals

SIPROTEC Compact 7SK80

Motor Protection Relay

The SIPROTEC Compact 7SK80 is a multi-

functional motor protection relay. It is de-

signed for asynchronous induction-type

motors of all sizes. The relays have all the

functionality to be applied as a backup relay

to a transformer differential relay.

The 7SK80 features “flexible protection

functions”. 20 additional protection func

tions can be created by the user. For exam

ple, a rate of change of frequency function

or a reverse power function can be created.

The relay provides circuit-breaker control,

additional primary switching devices

(grounding switches, transfer switches and

isolating switches) can also be controlled

from the relay. Automation or PLC logic

functionality is also implemented in the

relay. The integrated programmable logic

(CFC) allows the user to add own func

tions, e.g. for the automation of switch-

gear (including: low voltage starting, auto

matic restart, interlocking, transfer and

load shedding schemes). The user is also

allowed to generate user-defined messages.

The communication module is independ

ent from the protection. It can easily be

exchanged or upgraded to future commu

nication protocols.

Fig. 12/6

SIPROTEC 7SK80

motor protection r elay

LSP2874.tif

Highlights

Removable current and voltage terminals

provide the ideal solution for fast and

secure replacement of relays.

Binary input thresholds and current taps

are software settings. There is thus no need

to ever open the relay to adapt the hardware

configuration to a specific application.

The relay provides 9 programmable func

tion keys that can be used to replace push-

buttons, select switches and control switches.

The battery for event and fault recording

memory can be exchanged from the front

of the relay.

The relay is available with IEC 61850 for

incredible cost savings in applications (e.g.

transfer schemes with synch-check, bus

interlocking and load shedding schemes).

This compact relay provides protection,

control, metering and PLC logic functional

ity. Secure and easy to use one page matrix

IO programming is now a standard feature.

The housing creates a sealed dust proof

environment for the relay internal elec-

tronics. Heat build up is dissipated through

the surface area of the steel enclosure. No

dusty or corrosive air can be circulated

over the electronic components. The relay

thus will maintain its tested insulation

characteristic standards per IEC, IEEE,

even if deployed in harsh environment.

Revised Oct. 2008

Summary of content (36 pages)

PAGE 1
2 Motor Protection / 7SK80 SIPROTEC Compact 7SK80 Motor Protection Relay LSP2874.tif Function overview Fig. 12/6 SIPROTEC 7SK80 motor protection relay Description The SIPROTEC Compact 7SK80 is a multifunctional motor protection relay. It is designed for asynchronous induction-type motors of all sizes. The relays have all the functionality to be applied as a backup relay to a transformer differential relay. The 7SK80 features “flexible protection functions”.
PAGE 2
12 Motor Protection / 7SK80 Application Fig. 12/7 Function diagram The SIPROTEC Compact 7SK80 unit is a numerical protection relay that can perform control and monitoring functions and therefore provide the user with a cost-effective platform for asset protection, monitoring and management, that ensures reliable supply of electrical power to the motors or other plant assets. The ergonomic design makes control easy from the relay front panel. A large, easy-to-read display was a key design factor.
PAGE 3
12 Motor Protection / 7SK80 Application ANSI No.
PAGE 4
12 Motor Protection / 7SK80 LSP2885.tif Construction and hardware Connection techniques and housing with many advantages The relay housing is 1/6 of a 19" rack. The housing is thus identical in size to the 7SJ50 and 7SJ60 relays that makes replacement very easy. The height is 244 mm (9.61"). Illuminated 6-line display Pluggable current and voltage terminals allow for pre-wiring and simplify the exchange of devices. CT shorting is done in the removable current terminal block.
PAGE 5
12 Motor Protection / 7SK80 Protection functions Directional overcurrent protection, ground (ANSI 67N) Directional ground protection is a separate function. It operates in parallel to the nondirectional ground overcurrent elements. Their pickup values and delay times can be set separately. Definite-time and inversetime characteristics are offered. The tripping characteristic can be rotated by ± 180 degrees.
PAGE 6
12 Motor Protection / 7SK80 Protection functions Flexible protection functions The 7SK80 enables the user to easily add up to 20 additional protective functions. Parameter definitions are used to link standard protection logic with any chosen characteristic quantity (measured or calculated quantity) (Fig. 12/10). The standard logic consists of the usual protection elements such as the pickup set point, the set delay time, the TRIP command, a block function, etc.
PAGE 7
12 Motor Protection / 7SK80 Protection functions n Motor protection Restart inhibit (ANSI 66/86) If a motor is subjected to many successive starts, the rotor windings or rotor bars can be heated up to a point were the electrical connections between the rotor bars and the end rings are damaged. As it is not possible to physically measure the heat of the rotor we need to determine the heat by measuring the current the rotor is drawing through the stator to excite the rotor.
PAGE 8
12 Motor Protection / 7SK80 Protection functions n Voltage protection Overvoltage protection (ANSI 59) The two-element overvoltage protection detects unwanted network and machine overvoltage conditions. The function can operate either with phase-to-phase, phaseto-ground, positive phase-sequence or negative phase-sequence voltage. Threephase and single-phase connections are possible.
PAGE 9
12 Motor Protection / 7SK80 Further functions Measured values The r.m.s. values are calculated from the acquired current and voltage along with the power factor, frequency, active and reactive power.
PAGE 10
12 Motor Protection / 7SK80 Communication System interface protocols (retrofittable) IEC 61850 protocol The relay offers flexibility with reference to its communication to substation automation systems and industrial SCADA or DCS systems. The communication module firmware can be changed to communicate using another protocol or the modules can be changed completely for a different connection or protocol.
PAGE 11
12 Motor Protection / 7SK80 Communication DNP 3.0 protocol Power utilities use the serial DNP 3.0 (Distributed Network Protocol) for the station and network control levels. SIPROTEC units function as DNP slaves, supplying their information to a master system or receiving information from it. System solutions for protection and station control Units featuring IEC 60870-5-103 interfaces can be connected to SICAM in parallel via the RS485 bus or radially by fiber-optic link.
PAGE 12
Motor Protection / 7SK80 Typical connections n Connection of current and voltage transformers Standard connection For grounded networks, the ground current is obtained from the phase currents by the residual current circuit. Fig. 12/18 Residual current circuit without directional element Fig. 12/19 Sensitive groundcurrent detection without directional element 12 Fig.
PAGE 13
12 Motor Protection / 7SK80 Typical connections Connection for compensated networks The figure shows the connection of two phase-to-ground voltages and the VE voltage of the broken delta winding and a phase-balance neutral current transformer for the ground current. This connection maintains maximum precision for directional ground-fault detection and must be used in compensated networks. Fig. 12/21 Sensitive directional ground-fault detection (no directional element for phase) Fig.
PAGE 14
12 Motor Protection / 7SK80 Typical applications Overview of connection types Type of network Function Current connection Voltage connection (Low-resistance) grounded network Time-overcurrent protection phase/ground non-directional Residual circuit, with 3 phase-current transformers required, phase-balance neutral current transformer possible – (Low-resistance) grounded networks Sensitive ground-fault protection Phase-balance neutral current transformers required – Isolated or compensated netwo
PAGE 15
12 Motor Protection / 7SK80 Technical data General unit data Binary inputs Analog current inputs Type 7SK801/803/805/806 7SK802/804 Rated frequency fN 50 or 60 Hz (adjustable) Number (marshallable) 3 Rated current Inom 1 or 5 A Rated voltage range 24 to 250 V DC Ground current, sensitive INs w 1.6 · Inom linear range1) Burden per phase and ground path at Inom = 1 A at Inom = 5 A for sensitive ground fault detection at 1 A Current input, energized Approx. 0.
PAGE 16
12 Motor Protection / 7SK80 Technical data Insulation tests (cont'd) Impulse voltage test (type test) 5 kV (peak value); 1.2/50 µs; 0.
PAGE 17
12 Motor Protection / 7SK80 Technical data Unit design (cont'd) System interface Degree of protection acc.
PAGE 18
12 Motor Protection / 7SK80 Technical data System interface (cont'd) Transmission rate Up to 19200 baud Bridgeable distance Max. 1 km/3300 ft Dropout characteristics with disk emulation IEC acc. to IEC 60255-3 or BS 142 Fiber optic Connection fiber-optic cable ST connector transmitter/receiver Terminal At the bottom part of the housing, mounting location “B” Optical wavelength λ = 820 nm Permissible path attenuation Max. 8 dB, for glass fiber 62.5/125 µm Bridgeable distance Max. 1.5 km/0.
PAGE 19
12 Motor Protection / 7SK80 Technical data Cold-load pickup/dynamic setting change Controllable functions Time-overcurrent protection (separated acc. to phases and ground) Initiation criteria Current criterion “BkrClosed/MIN” CB position via aux.
PAGE 20
12 Motor Protection / 7SK80 Technical data Negative-sequence protection (ANSI 46) Times Pickup times f >, f< Dropout times f >, f< Definite-time characteristic (ANSI 46-1 and 46-2) Setting ranges Unbalanced load tripping element 46-1, 46-2 (I2>, I2>>) 0.5 to 15 A or ∞ (disabled)1) (in steps of 0.01 A) Delay times 46-1, 46-2 (TI2>, TI2>>) 0 to 60 s or ∞ (disabled)1) (in steps of 0.01 s) Dropout delay times 46 TDropout 0 to 60 s (in steps of 0.
PAGE 21
12 Motor Protection / 7SK80 Technical data Restart inhibit for motors (ANSI 66) Thermal overload protection (ANSI 49) Setting ranges Setting ranges Motor starting current relative to rated motor current IMOTOR START/IMotor Nom Rated motor current IMotor Nom Max. permissible starting time TStart Max. Equilibrium time TEqual Minimum inhibit time TMIN. INHIBIT TIME Max.
PAGE 22
12 Motor Protection / 7SK80 Technical data (Sensitive) ground-fault protection (ANSI 64, 50Ns, 51Ns, 67Ns) (cont'd) Ground-fault pickup for all types of ground faults Definite-time characteristic (ANSI 50Ns) Setting ranges Pickup current 50Ns-2 Pickup, 50Ns-1 Pickup; (IEE>, IEE>>) For sensitive 5-A-transformer 0.005 to 8 A1) (in steps of 0.005 A) For normal 5-A-transformer 0.25 to 175 A1) (in steps of 0.
PAGE 23
12 Motor Protection / 7SK80 Technical data Flexible protection functions (e.g. ANSI 27, 32, 37, 47, 50, 55, 59, 81R) (cont'd) Times Pickup times Current, voltage (phase quantities) With 2 times the setting value With 10 times the setting value Current, voltages (symmetrical components) With 2 times the setting value With 10 times the setting value Power Typical Maximum (low signals and thresholds) Power factor Frequency Rate-of-frequency change With 1.
PAGE 24
12 Motor Protection / 7SK80 Technical data Long-term averages Time stamping Time window 5, 15, 30 or 60 minutes Frequency of updates Adjustable Long-term averages of currents of active power of reactive power of apparent power IAdmd, IBdmd, ICdmd (IL1dmd, IL2dmd, IL3dmd) I1dmd in A (kA) Pdmd in W (kW, MW) Qdmd in VAr (kVAr, MVAr) Sdmd in VAr (kVAr, MVAr) Resolution for event log (operational annunciations) 1 ms Resolution for trip log (fault annunciations) 1 ms Maximum time deviation (internal
PAGE 25
12 Motor Protection / 7SK80 Technical data Clock Time synchronization Binary input, communication Setting group switchover of the function parameters Number of available setting groups Switchover performed 4 (parameter group A, B, C and D) Via keypad, DIGSI using the operator interface, protocol using port B or binary input Breaker control Number of switching units Depends on the binary inputs and outputs available Interlocking Freely programmable Messages Feedback messages, closed, open, intermed
PAGE 26
12 Motor Protection / 7SK80 Selection and ordering data Description Order No.
PAGE 27
12 Motor Protection / 7SK80 Selection and ordering data Description Order No.
PAGE 28
12 Motor Protection / 7SK80 Selection and ordering data Description Order No. 7SK80 motor protection device 7SK80oo – ooooo – o H o 0 Designation ANSI No.
PAGE 29
12 Motor Protection / 7SK80 Sample order Position Order No. + Order code 7SK8051-5EC96-3HD0+L0G Accessories 6 I/O’s: 3 BI/5 BO, 1 live status contact, 5 RTD inputs 7 Current transformer: Iph = 1 A / 5 A, Ie = 1 A / 5 A 8 Power supply: 60 to 250 V DC, 115 V AC to 230 V AC 9 Unit version: Flush-mounting housing, screw-type terminals 10 Region: US, English language (US); ANSI 11 Communication: System interface: DNP 3.
PAGE 30
12 Motor Protection / 7SK80 Connection diagram Fig.
PAGE 31
12 Motor Protection / 7SK80 Connection diagram Fig.
PAGE 32
12 Motor Protection / 7SK80 Connection diagram Fig.
PAGE 33
12 Motor Protection / 7SK80 Connection diagram Fig.
PAGE 34
12 Motor Protection / 7SK80 Connection diagram Fig. 12/28 7SK805 connection diagram 12 *) The shielding of the connecting cable is connected directly to the shield cap.
PAGE 35
12 Motor Protection / 7SK80 Connection diagram Fig. 12/29 7SK806 connection diagram 12 *) The shielding of the connecting cable is connected directly to the shield cap.
PAGE 36
12 Motor Protection / 7SK80 Dimension drawings in mm / inch Rear view Side view Front view Panel cutout Fig. 17/22 7SJ80/7SK80 protection unit for panel flush mounting/cubicle mounting 12 Side view Front view Fig.