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Manuals and User Guides for Siemens 7SN71. We have
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Siemens 7SN71 manual available for free PDF download: Instruction Manual
Siemens 7SN71 Instruction Manual (36 pages)
Transient earth-fault relay
Brand:
Siemens
| Category:
Relays
| Size: 0.33 MB
Table of Contents
Table of Contents
7
Application
9
Earth Fault Directional Determination
9
Figure 1.1 Charging Process in Compensated or Isolated Networks
9
Figure 1.2 Direction of the Displacement Voltage and the Earth Current (Earth-Fault Isolates at T1)
10
Figure 1.3 Detection of Fault Location
11
Functions and Features
12
Method of Operation
13
Current and Voltage Input (See Figure 2.1)
13
Figure 2.1 Current and Voltage Input
14
Evaluating Logic (See Figure 2.2)
15
Indication, Signalling and Test
15
Figure 2.2 Evaluating Logic and Signalling
15
Suppression of Switching Operations
16
Reset
16
Indication of the Continuous Earth-Fault Only in Forward Direction
16
Figure 2.3 Adjusting Elements
16
Operating Instructions
17
Safety Precuations
17
Figure 3.1 Connection to C.t. in Holmgreen Circuit
17
Figure 3.2 Connection to the Auxiliary Power Supply
18
Settings
19
Testing
19
Test Equipment 7VP8300-0
19
Testing of the 7SN71
19
Earth-Fault Direction Signal
20
Continuous Earth-Fault Signal
20
Figure 3.3 Test Setup
20
Technical Data
21
Ordering Code / MFLB
22
Table 4.1 Technical Data
22
Table 4.2 Selection and Ordering Data
22
Housing Types and Dimensions
23
Panel Flush Mounting
23
Figure 5.1 Dimensions for Housing and Panel Cutout (for Panel Flush Mounting)
23
Panel Surface Mounting
24
Figure 5.2 Dimensions for Housing/Mounting and Terminal Assignment (for Panel Surface Mounting)
24
Front View of Relay
25
Figure 5.3 Front View of Relay
25
Connection Diagrams
27
Connection Diagram of the 7SN71 (Panel Surface Mounting with AC Power Supply Unit)
27
Connection Diagram of the 7SN71 (Panel Surface Mounting with DC Power Supply Unit)
27
Figure A.5.4 Connection Diagram of the 7SN71 (Panel Surface Mounting with AC Power Supply Unit)
28
Figure A.5.5 Connection Diagram of the 7SN71 (Panel Surface Mounting with DC Power Supply Unit)
29
Index
31
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