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1、IEEE Std C37.20.6-1997 IEEE Standard for 4.76 kV to 38 kV Rated Grounding and Testing Devices Used in Enclosures Sponsor Switchgear Committee of the IEEE Power Engineering Society Approved 20 March 1997 IEEE Standards Board Approved 20 August 1997 American National Standards Institute Abstract: Draw
2、out type grounding and testing (G (508) 750-8400. Permission to photocopy portions of any individual standard for educational classroom use can also be obtained through the Copyright Clearance Center. Note: Attention is called to the possibility that implementation of this standard may require use o
3、f subject matter covered by patent rights. By publication of this standard, no position is taken with respect to the existence or validity of any patent rights in connection therewith. The IEEE shall not be responsible for identifying patents for which a license may be required by an IEEE standard o
4、r for conducting inquiries into the legal validity or scope of those patents that are brought to its attention. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/28/
5、2007 23:27:28 MDTNo reproduction or networking permitted without license from IHS -,-,- iii Introduction (This introduction is not a part of IEEE Std C37.20.6-1997, IEEE Standard for 4.76 kV to 38 kV Rated Grounding and Testing Devices Used in Enclosures.) Although grounding and testing devices (G i
6、t shall be in accordance with 4.4.5 and 4.4.6 of IEEE Std C37.20.2-1993. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/28/2007 23:27:28 MDTNo reproduction or net
7、working permitted without license from IHS -,-,- 4Copyright 1997 IEEE All Rights Reserved IEEE Std C37.20.6-1997IEEE STANDARD FOR 4.76 kV to 38 kV RATED GROUNDING 5.5 Rated momentary current The rated momentary current of a G the peak current value shall be 2.6 times its rated short- time current, a
8、t the major peak of the maximum cycle, and the rms total current shall be 1.55 times its rated short-time current, as determined from the envelope of the current wave. This rating shall be no less than the required close-and- latch current capability of the circuit breaker it is intended to replace.
9、 5.6 Rated control voltage The rated control voltage of an electrically operated G the peak current value shall be 2.6 times its rated short-time current, at the major peak of the maximum cycle; and the rms total current shall be 1.55 times its rated short-time current, as determined from the envelo
10、pe of the current wave. This rating shall be no less than the required close-and-latch current capability of the circuit breaker it is intended to replace. 6. Functional components The functional components required for manual and electrical ground and test devices are listed in Table 1. Additional
11、accessory devices may be available and the manufacturer should be consulted for specific information. 6.1 Power-operated ground-making switch position indicator Each G&T device equipped with a power-operated ground-making switch shall have an indicator visible from the front of the device when insta
12、lled in the enclosure to show the closed and open position of the power-operated ground- making switch. The following colors shall be used: a)Red background with the word CLOSED-GROUNDED in contrasting color to indicate closed contacts. b)Green background with the word OPEN-UNGROUNDED in contrasting
13、 color to indicate open contacts. 6.2 Terminal selector switch and position indicator The manually operated terminal selector switch provides the ability to connect the power-operated ground-making switch to either terminal set (or neutral position if provided). The terminal selector switch position
14、 shall be able to be changed only when the G&T device is fully removed from the enclosure, and means for visual verification of the terminal switch position shall be provided. A position indicator, visible from the front when the device is installed in the enclosure, shall show which terminal set ha
15、s been selected (including the neutral position if provided). Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/28/2007 23:27:28 MDTNo reproduction or networking per
16、mitted without license from IHS -,-,- Copyright 1997 IEEE All Rights Reserved5 AND TESTING DEVICES USED IN ENCLOSURESIEEE Std C37.20.6-1997 Table 1 Functional components 6.3 Stored energy indicator For mechanisms intended to be charged and to remain charged until released, a stored energy indicator
17、shall be provided. The following colors shall be used: a)Yellow background with black lettering to indicate that the closing mechanism is CHARGED. b)White background with black lettering to indicate that the closing mechanism is DISCHARGED. 6.4 Interlocking Interlocking for G&T devices can be very d
18、etailed depending upon the complexity of the device, especially when it is equipped with multiple functional components. The requirements given in 6.4.1 through 6.4.6 are considered the minimum interlocking requirements. 6.4.1 Insertion and withdrawal All G&T devices shall be able to be inserted and
19、 withdrawn from the circuit breaker compartment using the same, or compatible, mechanism design as that of the circuit breakers they temporarily replace, including the drawout position indication. Functional componentDevice type Simple manual Simple electrical Complex electrical One terminal set* *P
20、rimary disconnecting devices as required for compartment compatibility. XX Two terminal sets*X Optional. X Ground cable and connectors (see 8.3)X Ground connection systemXXX Test portsXX Test probesXX Power-operated ground-making switchXX Position indicator (see 6.1)XX Manual opening releaseXX Remot
21、e electrical control (see 8.4)XX Electrical opening release (see 8.4)XX Stored energy indicator (see 6.3)X Required on stored energy closing mechanisms when the mechanism can remain in the charged position. X Manually operated terminal selector switch (see 6.2) X Position indicator (see 6.2) X Inter
22、locking (see 6.4)XXX Nameplate(s) (see 6.5)XXX Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/28/2007 23:27:28 MDTNo reproduction or networking permitted without
23、license from IHS -,-,- 6Copyright 1997 IEEE All Rights Reserved IEEE Std C37.20.6-1997IEEE STANDARD FOR 4.76 kV to 38 kV RATED GROUNDING 6.4.2 Coordination All G&T devices shall be equipped with a mechanical interlock, in coordination with existing provisions in the corresponding circuit breaker com
24、partment, to block the G&T device from being inserted into a circuit breaker compartment whose ratings exceed those of the G&T device. 6.4.3 Ground-making switch closed Every electrical G&T device shall have mechanical interlocking to prevent it from being inserted or withdrawn when the power-operat
25、ed ground-making switch is closed. 6.4.4 Ports barriers Simple and complex G&T devices equipped with voltage test ports shall have a barrier that prevents inadvertent access to each test port. Secure locking means shall be provided to prevent the barrier from being inadvertently moved to expose the
26、ungrounded terminal set. 6.4.5 Terminal sets barriers A simple manual G&T device equipped with two terminal sets shall have a barrier that prevents access to the ungrounded terminal set. Secure means shall be provided to prevent the barrier from being inadvertently moved to expose the ungrounded ter
27、minal set. 6.4.6 User specified interlocks The user shall specify the interlocking required by the system operating procedures. The user shall identify any additional interlocks required on the G&T device and between the G&T device and users devices, based on the selection of functional components.
28、This interlocking is complex. For example, it can consist of mechanical bar types, hasps for keyed padlocks, and/or mounted key interlocks. 6.5 Nameplate(s) The following minimum information shall be given on the device nameplate(s): a)Manufacturers name b)Manufacturers type and identification refer
29、ence c)Serial number d)Year of manufacture e)Rated maximum voltage (in kV) f)Rated power frequency withstand voltage (in kV) g)Rated impulse withstand voltage (in kV) h)Rated power frequency (60 Hz) i)Rated short-time current (kA symmetrical) j)Rated momentary current (kA peak and kA rms total curre
30、nt) k)Rated control voltage (in V) (for electrical G&T devices) l)Close-and-latch current capability (kA peak and kA rms total current) (for electrical G&T devices) m)Primary disconnecting devices compartment compatibility (in A) n)Instruction manual number Copyright The Institute of Electrical and
31、Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/28/2007 23:27:28 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright 1997 IEEE All Rights Reserved7 AND TESTING DEVICES USED
32、IN ENCLOSURESIEEE Std C37.20.6-1997 7. Test requirements 7.1 General This clause describes the required design and production tests. 7.2 Design tests Design tests shall be made to determine the adequacy of a particular type of G&T device to meet its assigned ratings and to operate satisfactorily in
33、service. Design tests shall be made on representative G&T devices to demonstrate the ratings assigned. All design tests shall be made with the G&T device in a test enclosure. The enclosure for a particular type of G&T device shall be either the minimum dimension, single-unit enclosure with the small
34、est electrical spacing as recommended by the manufacturer, including the phase and ground conductor sizes, or a production switchgear vertical section of the type and rating in which the G&T device will be used. The conditions prevailing at the test site shall be in accordance with Clause 4. and the
35、 G&T device shall be new or reconditioned. 7.3 Schedule of design tests Design testing of a G&T device shall be performed in accordance with 7.3.1 through 7.3.5. 7.3.1 Dielectric tests The power frequency withstand voltage test (see 7.3.1.1) and full-wave impulse withstand voltage test (see 7.3.1.2)
36、 shall be performed on the G&T device to demonstrate the ability of the insulation system to withstand rated voltages. The tests on the insulation system shall be made under the normal atmospheric conditions prevailing at the test laboratory. Appropriate air density correction factor shall be applie
37、d as outlined in IEEE Std 4-1978. Optional humidity correction factors, if used, shall be based on rod gaps as stated in IEEE Std 4-1978, Table 1.3. Test voltages shall be applied between ungrounded primary terminals and the G&T device ground connection system in the following manner: a)Simple manua
38、l G&T device. Individually energize each terminal (without cables, but with barriers) with the frame and device ground connection system and all other terminals grounded. b)Simple electrical G&T device. With the power-operated ground-making switch open, individually energize each terminal/test port
39、with the frame and device ground connection system and all other terminals/test ports grounded. c)Complex electrical G&T device. 1)With the power-operated ground-making switch open: With the manually operated terminal selector switch in the “upper” position, individually energize each terminal/test
40、port, with the frame and device ground connection system and all other terminals/test port grounded. With the annually operated terminal selector switch the “lower” position, individually energize each terminal/test port, with the frame and device ground connection system and all other terminals/tes
41、t ports grounded. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/28/2007 23:27:28 MDTNo reproduction or networking permitted without license from IHS -,-,- 8 Copy
42、right 1997 IEEE All Rights Reserved IEEE Std C37.20.6-1997IEEE STANDARD FOR 4.76 kV to 38 kV RATED GROUNDING With the manually operated terminal selector switch (if provided) in the neutral position, individually energize each terminal/test port, with the frame and device ground connection system an
43、d all other terminals/test ports grounded. 2)With the power-operated ground-making switch closed: With the manually operated terminal selector switch in the “upper” position, individually energize each “lower” terminal/test port, with the frame and device ground connection system and all other termi
44、nals/test ports grounded. With the manually operated terminal selector switch in the “lower” position, individually energize each “upper” terminal/test port, with the frame and device ground connection system and all other terminals/test ports grounded. With the manually operated terminal selector i
45、n the neutral position, if provided, individually energize each terminal/test port, with the frame and device ground connection system and all other terminals/test port grounded. NOTE Depending on the G&T device ground-making switch design, it may be possible to eliminate the test described in item
46、c2) above. 7.3.1.1 Power frequency withstand voltage test A sinusoidal alternating-current voltage shall have a crest value of no less than 1.414 times the rated power frequency withstand voltage value specifi ed, and shall be applied to each terminal as specifi ed in 7.3.1. The frequency shall be w
47、ithin 20% of the rated power frequency. The test voltage shall be gradually increased within 30 s to 60 s from zero to the required test value and shall be held at that voltage value for 1 min without fl ashover. 7.3.1.2 Full-wave impulse withstand voltage test The full-wave impulse withstand voltag
48、e, with a wave shape of 1.2 50 s, shall be as described in IEEE Std 4-1978. Tests shall be applied as specifi ed in 7.3.1, with three positive and negative impulses applied to each ungrounded terminal and test port (if provided) without fl ashover. If during the fi rst group of three consecutive impulses, one fl ashover occurs in the self-restoring insulation, nine additional impulses shall be applied. If the G&T device successfully withstands all nine of the second group of impulses, the fl ashover in the fi rst group shall be considered as random and the G&T device shall be consid